1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Kernel-based Virtual Machine driver for Linux 4 * 5 * derived from drivers/kvm/kvm_main.c 6 * 7 * Copyright (C) 2006 Qumranet, Inc. 8 * Copyright (C) 2008 Qumranet, Inc. 9 * Copyright IBM Corporation, 2008 10 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 11 * 12 * Authors: 13 * Avi Kivity <avi@qumranet.com> 14 * Yaniv Kamay <yaniv@qumranet.com> 15 * Amit Shah <amit.shah@qumranet.com> 16 * Ben-Ami Yassour <benami@il.ibm.com> 17 */ 18 19 #include <linux/kvm_host.h> 20 #include "irq.h" 21 #include "ioapic.h" 22 #include "mmu.h" 23 #include "i8254.h" 24 #include "tss.h" 25 #include "kvm_cache_regs.h" 26 #include "kvm_emulate.h" 27 #include "x86.h" 28 #include "cpuid.h" 29 #include "pmu.h" 30 #include "hyperv.h" 31 #include "lapic.h" 32 #include "xen.h" 33 34 #include <linux/clocksource.h> 35 #include <linux/interrupt.h> 36 #include <linux/kvm.h> 37 #include <linux/fs.h> 38 #include <linux/vmalloc.h> 39 #include <linux/export.h> 40 #include <linux/moduleparam.h> 41 #include <linux/mman.h> 42 #include <linux/highmem.h> 43 #include <linux/iommu.h> 44 #include <linux/intel-iommu.h> 45 #include <linux/cpufreq.h> 46 #include <linux/user-return-notifier.h> 47 #include <linux/srcu.h> 48 #include <linux/slab.h> 49 #include <linux/perf_event.h> 50 #include <linux/uaccess.h> 51 #include <linux/hash.h> 52 #include <linux/pci.h> 53 #include <linux/timekeeper_internal.h> 54 #include <linux/pvclock_gtod.h> 55 #include <linux/kvm_irqfd.h> 56 #include <linux/irqbypass.h> 57 #include <linux/sched/stat.h> 58 #include <linux/sched/isolation.h> 59 #include <linux/mem_encrypt.h> 60 #include <linux/entry-kvm.h> 61 62 #include <trace/events/kvm.h> 63 64 #include <asm/debugreg.h> 65 #include <asm/msr.h> 66 #include <asm/desc.h> 67 #include <asm/mce.h> 68 #include <linux/kernel_stat.h> 69 #include <asm/fpu/internal.h> /* Ugh! */ 70 #include <asm/pvclock.h> 71 #include <asm/div64.h> 72 #include <asm/irq_remapping.h> 73 #include <asm/mshyperv.h> 74 #include <asm/hypervisor.h> 75 #include <asm/tlbflush.h> 76 #include <asm/intel_pt.h> 77 #include <asm/emulate_prefix.h> 78 #include <clocksource/hyperv_timer.h> 79 80 #define CREATE_TRACE_POINTS 81 #include "trace.h" 82 83 #define MAX_IO_MSRS 256 84 #define KVM_MAX_MCE_BANKS 32 85 u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P; 86 EXPORT_SYMBOL_GPL(kvm_mce_cap_supported); 87 88 #define emul_to_vcpu(ctxt) \ 89 ((struct kvm_vcpu *)(ctxt)->vcpu) 90 91 /* EFER defaults: 92 * - enable syscall per default because its emulated by KVM 93 * - enable LME and LMA per default on 64 bit KVM 94 */ 95 #ifdef CONFIG_X86_64 96 static 97 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); 98 #else 99 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE); 100 #endif 101 102 static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS; 103 104 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \ 105 KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 106 107 static void update_cr8_intercept(struct kvm_vcpu *vcpu); 108 static void process_nmi(struct kvm_vcpu *vcpu); 109 static void process_smi(struct kvm_vcpu *vcpu); 110 static void enter_smm(struct kvm_vcpu *vcpu); 111 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); 112 static void store_regs(struct kvm_vcpu *vcpu); 113 static int sync_regs(struct kvm_vcpu *vcpu); 114 115 struct kvm_x86_ops kvm_x86_ops __read_mostly; 116 EXPORT_SYMBOL_GPL(kvm_x86_ops); 117 118 #define KVM_X86_OP(func) \ 119 DEFINE_STATIC_CALL_NULL(kvm_x86_##func, \ 120 *(((struct kvm_x86_ops *)0)->func)); 121 #define KVM_X86_OP_NULL KVM_X86_OP 122 #include <asm/kvm-x86-ops.h> 123 EXPORT_STATIC_CALL_GPL(kvm_x86_get_cs_db_l_bits); 124 EXPORT_STATIC_CALL_GPL(kvm_x86_cache_reg); 125 EXPORT_STATIC_CALL_GPL(kvm_x86_tlb_flush_current); 126 127 static bool __read_mostly ignore_msrs = 0; 128 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR); 129 130 bool __read_mostly report_ignored_msrs = true; 131 module_param(report_ignored_msrs, bool, S_IRUGO | S_IWUSR); 132 EXPORT_SYMBOL_GPL(report_ignored_msrs); 133 134 unsigned int min_timer_period_us = 200; 135 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR); 136 137 static bool __read_mostly kvmclock_periodic_sync = true; 138 module_param(kvmclock_periodic_sync, bool, S_IRUGO); 139 140 bool __read_mostly kvm_has_tsc_control; 141 EXPORT_SYMBOL_GPL(kvm_has_tsc_control); 142 u32 __read_mostly kvm_max_guest_tsc_khz; 143 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); 144 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits; 145 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits); 146 u64 __read_mostly kvm_max_tsc_scaling_ratio; 147 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio); 148 u64 __read_mostly kvm_default_tsc_scaling_ratio; 149 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio); 150 bool __read_mostly kvm_has_bus_lock_exit; 151 EXPORT_SYMBOL_GPL(kvm_has_bus_lock_exit); 152 153 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */ 154 static u32 __read_mostly tsc_tolerance_ppm = 250; 155 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR); 156 157 /* 158 * lapic timer advance (tscdeadline mode only) in nanoseconds. '-1' enables 159 * adaptive tuning starting from default advancment of 1000ns. '0' disables 160 * advancement entirely. Any other value is used as-is and disables adaptive 161 * tuning, i.e. allows priveleged userspace to set an exact advancement time. 162 */ 163 static int __read_mostly lapic_timer_advance_ns = -1; 164 module_param(lapic_timer_advance_ns, int, S_IRUGO | S_IWUSR); 165 166 static bool __read_mostly vector_hashing = true; 167 module_param(vector_hashing, bool, S_IRUGO); 168 169 bool __read_mostly enable_vmware_backdoor = false; 170 module_param(enable_vmware_backdoor, bool, S_IRUGO); 171 EXPORT_SYMBOL_GPL(enable_vmware_backdoor); 172 173 static bool __read_mostly force_emulation_prefix = false; 174 module_param(force_emulation_prefix, bool, S_IRUGO); 175 176 int __read_mostly pi_inject_timer = -1; 177 module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR); 178 179 /* 180 * Restoring the host value for MSRs that are only consumed when running in 181 * usermode, e.g. SYSCALL MSRs and TSC_AUX, can be deferred until the CPU 182 * returns to userspace, i.e. the kernel can run with the guest's value. 183 */ 184 #define KVM_MAX_NR_USER_RETURN_MSRS 16 185 186 struct kvm_user_return_msrs_global { 187 int nr; 188 u32 msrs[KVM_MAX_NR_USER_RETURN_MSRS]; 189 }; 190 191 struct kvm_user_return_msrs { 192 struct user_return_notifier urn; 193 bool registered; 194 struct kvm_user_return_msr_values { 195 u64 host; 196 u64 curr; 197 } values[KVM_MAX_NR_USER_RETURN_MSRS]; 198 }; 199 200 static struct kvm_user_return_msrs_global __read_mostly user_return_msrs_global; 201 static struct kvm_user_return_msrs __percpu *user_return_msrs; 202 203 #define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \ 204 | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \ 205 | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \ 206 | XFEATURE_MASK_PKRU) 207 208 u64 __read_mostly host_efer; 209 EXPORT_SYMBOL_GPL(host_efer); 210 211 bool __read_mostly allow_smaller_maxphyaddr = 0; 212 EXPORT_SYMBOL_GPL(allow_smaller_maxphyaddr); 213 214 u64 __read_mostly host_xss; 215 EXPORT_SYMBOL_GPL(host_xss); 216 u64 __read_mostly supported_xss; 217 EXPORT_SYMBOL_GPL(supported_xss); 218 219 struct kvm_stats_debugfs_item debugfs_entries[] = { 220 VCPU_STAT("pf_fixed", pf_fixed), 221 VCPU_STAT("pf_guest", pf_guest), 222 VCPU_STAT("tlb_flush", tlb_flush), 223 VCPU_STAT("invlpg", invlpg), 224 VCPU_STAT("exits", exits), 225 VCPU_STAT("io_exits", io_exits), 226 VCPU_STAT("mmio_exits", mmio_exits), 227 VCPU_STAT("signal_exits", signal_exits), 228 VCPU_STAT("irq_window", irq_window_exits), 229 VCPU_STAT("nmi_window", nmi_window_exits), 230 VCPU_STAT("halt_exits", halt_exits), 231 VCPU_STAT("halt_successful_poll", halt_successful_poll), 232 VCPU_STAT("halt_attempted_poll", halt_attempted_poll), 233 VCPU_STAT("halt_poll_invalid", halt_poll_invalid), 234 VCPU_STAT("halt_wakeup", halt_wakeup), 235 VCPU_STAT("hypercalls", hypercalls), 236 VCPU_STAT("request_irq", request_irq_exits), 237 VCPU_STAT("irq_exits", irq_exits), 238 VCPU_STAT("host_state_reload", host_state_reload), 239 VCPU_STAT("fpu_reload", fpu_reload), 240 VCPU_STAT("insn_emulation", insn_emulation), 241 VCPU_STAT("insn_emulation_fail", insn_emulation_fail), 242 VCPU_STAT("irq_injections", irq_injections), 243 VCPU_STAT("nmi_injections", nmi_injections), 244 VCPU_STAT("req_event", req_event), 245 VCPU_STAT("l1d_flush", l1d_flush), 246 VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns), 247 VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns), 248 VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped), 249 VM_STAT("mmu_pte_write", mmu_pte_write), 250 VM_STAT("mmu_pde_zapped", mmu_pde_zapped), 251 VM_STAT("mmu_flooded", mmu_flooded), 252 VM_STAT("mmu_recycled", mmu_recycled), 253 VM_STAT("mmu_cache_miss", mmu_cache_miss), 254 VM_STAT("mmu_unsync", mmu_unsync), 255 VM_STAT("remote_tlb_flush", remote_tlb_flush), 256 VM_STAT("largepages", lpages, .mode = 0444), 257 VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444), 258 VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions), 259 { NULL } 260 }; 261 262 u64 __read_mostly host_xcr0; 263 u64 __read_mostly supported_xcr0; 264 EXPORT_SYMBOL_GPL(supported_xcr0); 265 266 static struct kmem_cache *x86_fpu_cache; 267 268 static struct kmem_cache *x86_emulator_cache; 269 270 /* 271 * When called, it means the previous get/set msr reached an invalid msr. 272 * Return true if we want to ignore/silent this failed msr access. 273 */ 274 static bool kvm_msr_ignored_check(struct kvm_vcpu *vcpu, u32 msr, 275 u64 data, bool write) 276 { 277 const char *op = write ? "wrmsr" : "rdmsr"; 278 279 if (ignore_msrs) { 280 if (report_ignored_msrs) 281 kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n", 282 op, msr, data); 283 /* Mask the error */ 284 return true; 285 } else { 286 kvm_debug_ratelimited("unhandled %s: 0x%x data 0x%llx\n", 287 op, msr, data); 288 return false; 289 } 290 } 291 292 static struct kmem_cache *kvm_alloc_emulator_cache(void) 293 { 294 unsigned int useroffset = offsetof(struct x86_emulate_ctxt, src); 295 unsigned int size = sizeof(struct x86_emulate_ctxt); 296 297 return kmem_cache_create_usercopy("x86_emulator", size, 298 __alignof__(struct x86_emulate_ctxt), 299 SLAB_ACCOUNT, useroffset, 300 size - useroffset, NULL); 301 } 302 303 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); 304 305 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) 306 { 307 int i; 308 for (i = 0; i < ASYNC_PF_PER_VCPU; i++) 309 vcpu->arch.apf.gfns[i] = ~0; 310 } 311 312 static void kvm_on_user_return(struct user_return_notifier *urn) 313 { 314 unsigned slot; 315 struct kvm_user_return_msrs *msrs 316 = container_of(urn, struct kvm_user_return_msrs, urn); 317 struct kvm_user_return_msr_values *values; 318 unsigned long flags; 319 320 /* 321 * Disabling irqs at this point since the following code could be 322 * interrupted and executed through kvm_arch_hardware_disable() 323 */ 324 local_irq_save(flags); 325 if (msrs->registered) { 326 msrs->registered = false; 327 user_return_notifier_unregister(urn); 328 } 329 local_irq_restore(flags); 330 for (slot = 0; slot < user_return_msrs_global.nr; ++slot) { 331 values = &msrs->values[slot]; 332 if (values->host != values->curr) { 333 wrmsrl(user_return_msrs_global.msrs[slot], values->host); 334 values->curr = values->host; 335 } 336 } 337 } 338 339 void kvm_define_user_return_msr(unsigned slot, u32 msr) 340 { 341 BUG_ON(slot >= KVM_MAX_NR_USER_RETURN_MSRS); 342 user_return_msrs_global.msrs[slot] = msr; 343 if (slot >= user_return_msrs_global.nr) 344 user_return_msrs_global.nr = slot + 1; 345 } 346 EXPORT_SYMBOL_GPL(kvm_define_user_return_msr); 347 348 static void kvm_user_return_msr_cpu_online(void) 349 { 350 unsigned int cpu = smp_processor_id(); 351 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu); 352 u64 value; 353 int i; 354 355 for (i = 0; i < user_return_msrs_global.nr; ++i) { 356 rdmsrl_safe(user_return_msrs_global.msrs[i], &value); 357 msrs->values[i].host = value; 358 msrs->values[i].curr = value; 359 } 360 } 361 362 int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask) 363 { 364 unsigned int cpu = smp_processor_id(); 365 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu); 366 int err; 367 368 value = (value & mask) | (msrs->values[slot].host & ~mask); 369 if (value == msrs->values[slot].curr) 370 return 0; 371 err = wrmsrl_safe(user_return_msrs_global.msrs[slot], value); 372 if (err) 373 return 1; 374 375 msrs->values[slot].curr = value; 376 if (!msrs->registered) { 377 msrs->urn.on_user_return = kvm_on_user_return; 378 user_return_notifier_register(&msrs->urn); 379 msrs->registered = true; 380 } 381 return 0; 382 } 383 EXPORT_SYMBOL_GPL(kvm_set_user_return_msr); 384 385 static void drop_user_return_notifiers(void) 386 { 387 unsigned int cpu = smp_processor_id(); 388 struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu); 389 390 if (msrs->registered) 391 kvm_on_user_return(&msrs->urn); 392 } 393 394 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) 395 { 396 return vcpu->arch.apic_base; 397 } 398 EXPORT_SYMBOL_GPL(kvm_get_apic_base); 399 400 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu) 401 { 402 return kvm_apic_mode(kvm_get_apic_base(vcpu)); 403 } 404 EXPORT_SYMBOL_GPL(kvm_get_apic_mode); 405 406 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 407 { 408 enum lapic_mode old_mode = kvm_get_apic_mode(vcpu); 409 enum lapic_mode new_mode = kvm_apic_mode(msr_info->data); 410 u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff | 411 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE); 412 413 if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID) 414 return 1; 415 if (!msr_info->host_initiated) { 416 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC) 417 return 1; 418 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC) 419 return 1; 420 } 421 422 kvm_lapic_set_base(vcpu, msr_info->data); 423 kvm_recalculate_apic_map(vcpu->kvm); 424 return 0; 425 } 426 EXPORT_SYMBOL_GPL(kvm_set_apic_base); 427 428 asmlinkage __visible noinstr void kvm_spurious_fault(void) 429 { 430 /* Fault while not rebooting. We want the trace. */ 431 BUG_ON(!kvm_rebooting); 432 } 433 EXPORT_SYMBOL_GPL(kvm_spurious_fault); 434 435 #define EXCPT_BENIGN 0 436 #define EXCPT_CONTRIBUTORY 1 437 #define EXCPT_PF 2 438 439 static int exception_class(int vector) 440 { 441 switch (vector) { 442 case PF_VECTOR: 443 return EXCPT_PF; 444 case DE_VECTOR: 445 case TS_VECTOR: 446 case NP_VECTOR: 447 case SS_VECTOR: 448 case GP_VECTOR: 449 return EXCPT_CONTRIBUTORY; 450 default: 451 break; 452 } 453 return EXCPT_BENIGN; 454 } 455 456 #define EXCPT_FAULT 0 457 #define EXCPT_TRAP 1 458 #define EXCPT_ABORT 2 459 #define EXCPT_INTERRUPT 3 460 461 static int exception_type(int vector) 462 { 463 unsigned int mask; 464 465 if (WARN_ON(vector > 31 || vector == NMI_VECTOR)) 466 return EXCPT_INTERRUPT; 467 468 mask = 1 << vector; 469 470 /* #DB is trap, as instruction watchpoints are handled elsewhere */ 471 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR))) 472 return EXCPT_TRAP; 473 474 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR))) 475 return EXCPT_ABORT; 476 477 /* Reserved exceptions will result in fault */ 478 return EXCPT_FAULT; 479 } 480 481 void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu) 482 { 483 unsigned nr = vcpu->arch.exception.nr; 484 bool has_payload = vcpu->arch.exception.has_payload; 485 unsigned long payload = vcpu->arch.exception.payload; 486 487 if (!has_payload) 488 return; 489 490 switch (nr) { 491 case DB_VECTOR: 492 /* 493 * "Certain debug exceptions may clear bit 0-3. The 494 * remaining contents of the DR6 register are never 495 * cleared by the processor". 496 */ 497 vcpu->arch.dr6 &= ~DR_TRAP_BITS; 498 /* 499 * In order to reflect the #DB exception payload in guest 500 * dr6, three components need to be considered: active low 501 * bit, FIXED_1 bits and active high bits (e.g. DR6_BD, 502 * DR6_BS and DR6_BT) 503 * DR6_ACTIVE_LOW contains the FIXED_1 and active low bits. 504 * In the target guest dr6: 505 * FIXED_1 bits should always be set. 506 * Active low bits should be cleared if 1-setting in payload. 507 * Active high bits should be set if 1-setting in payload. 508 * 509 * Note, the payload is compatible with the pending debug 510 * exceptions/exit qualification under VMX, that active_low bits 511 * are active high in payload. 512 * So they need to be flipped for DR6. 513 */ 514 vcpu->arch.dr6 |= DR6_ACTIVE_LOW; 515 vcpu->arch.dr6 |= payload; 516 vcpu->arch.dr6 ^= payload & DR6_ACTIVE_LOW; 517 518 /* 519 * The #DB payload is defined as compatible with the 'pending 520 * debug exceptions' field under VMX, not DR6. While bit 12 is 521 * defined in the 'pending debug exceptions' field (enabled 522 * breakpoint), it is reserved and must be zero in DR6. 523 */ 524 vcpu->arch.dr6 &= ~BIT(12); 525 break; 526 case PF_VECTOR: 527 vcpu->arch.cr2 = payload; 528 break; 529 } 530 531 vcpu->arch.exception.has_payload = false; 532 vcpu->arch.exception.payload = 0; 533 } 534 EXPORT_SYMBOL_GPL(kvm_deliver_exception_payload); 535 536 static void kvm_multiple_exception(struct kvm_vcpu *vcpu, 537 unsigned nr, bool has_error, u32 error_code, 538 bool has_payload, unsigned long payload, bool reinject) 539 { 540 u32 prev_nr; 541 int class1, class2; 542 543 kvm_make_request(KVM_REQ_EVENT, vcpu); 544 545 if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) { 546 queue: 547 if (has_error && !is_protmode(vcpu)) 548 has_error = false; 549 if (reinject) { 550 /* 551 * On vmentry, vcpu->arch.exception.pending is only 552 * true if an event injection was blocked by 553 * nested_run_pending. In that case, however, 554 * vcpu_enter_guest requests an immediate exit, 555 * and the guest shouldn't proceed far enough to 556 * need reinjection. 557 */ 558 WARN_ON_ONCE(vcpu->arch.exception.pending); 559 vcpu->arch.exception.injected = true; 560 if (WARN_ON_ONCE(has_payload)) { 561 /* 562 * A reinjected event has already 563 * delivered its payload. 564 */ 565 has_payload = false; 566 payload = 0; 567 } 568 } else { 569 vcpu->arch.exception.pending = true; 570 vcpu->arch.exception.injected = false; 571 } 572 vcpu->arch.exception.has_error_code = has_error; 573 vcpu->arch.exception.nr = nr; 574 vcpu->arch.exception.error_code = error_code; 575 vcpu->arch.exception.has_payload = has_payload; 576 vcpu->arch.exception.payload = payload; 577 if (!is_guest_mode(vcpu)) 578 kvm_deliver_exception_payload(vcpu); 579 return; 580 } 581 582 /* to check exception */ 583 prev_nr = vcpu->arch.exception.nr; 584 if (prev_nr == DF_VECTOR) { 585 /* triple fault -> shutdown */ 586 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 587 return; 588 } 589 class1 = exception_class(prev_nr); 590 class2 = exception_class(nr); 591 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) 592 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { 593 /* 594 * Generate double fault per SDM Table 5-5. Set 595 * exception.pending = true so that the double fault 596 * can trigger a nested vmexit. 597 */ 598 vcpu->arch.exception.pending = true; 599 vcpu->arch.exception.injected = false; 600 vcpu->arch.exception.has_error_code = true; 601 vcpu->arch.exception.nr = DF_VECTOR; 602 vcpu->arch.exception.error_code = 0; 603 vcpu->arch.exception.has_payload = false; 604 vcpu->arch.exception.payload = 0; 605 } else 606 /* replace previous exception with a new one in a hope 607 that instruction re-execution will regenerate lost 608 exception */ 609 goto queue; 610 } 611 612 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) 613 { 614 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, false); 615 } 616 EXPORT_SYMBOL_GPL(kvm_queue_exception); 617 618 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) 619 { 620 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, true); 621 } 622 EXPORT_SYMBOL_GPL(kvm_requeue_exception); 623 624 void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr, 625 unsigned long payload) 626 { 627 kvm_multiple_exception(vcpu, nr, false, 0, true, payload, false); 628 } 629 EXPORT_SYMBOL_GPL(kvm_queue_exception_p); 630 631 static void kvm_queue_exception_e_p(struct kvm_vcpu *vcpu, unsigned nr, 632 u32 error_code, unsigned long payload) 633 { 634 kvm_multiple_exception(vcpu, nr, true, error_code, 635 true, payload, false); 636 } 637 638 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) 639 { 640 if (err) 641 kvm_inject_gp(vcpu, 0); 642 else 643 return kvm_skip_emulated_instruction(vcpu); 644 645 return 1; 646 } 647 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); 648 649 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 650 { 651 ++vcpu->stat.pf_guest; 652 vcpu->arch.exception.nested_apf = 653 is_guest_mode(vcpu) && fault->async_page_fault; 654 if (vcpu->arch.exception.nested_apf) { 655 vcpu->arch.apf.nested_apf_token = fault->address; 656 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); 657 } else { 658 kvm_queue_exception_e_p(vcpu, PF_VECTOR, fault->error_code, 659 fault->address); 660 } 661 } 662 EXPORT_SYMBOL_GPL(kvm_inject_page_fault); 663 664 bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu, 665 struct x86_exception *fault) 666 { 667 struct kvm_mmu *fault_mmu; 668 WARN_ON_ONCE(fault->vector != PF_VECTOR); 669 670 fault_mmu = fault->nested_page_fault ? vcpu->arch.mmu : 671 vcpu->arch.walk_mmu; 672 673 /* 674 * Invalidate the TLB entry for the faulting address, if it exists, 675 * else the access will fault indefinitely (and to emulate hardware). 676 */ 677 if ((fault->error_code & PFERR_PRESENT_MASK) && 678 !(fault->error_code & PFERR_RSVD_MASK)) 679 kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address, 680 fault_mmu->root_hpa); 681 682 fault_mmu->inject_page_fault(vcpu, fault); 683 return fault->nested_page_fault; 684 } 685 EXPORT_SYMBOL_GPL(kvm_inject_emulated_page_fault); 686 687 void kvm_inject_nmi(struct kvm_vcpu *vcpu) 688 { 689 atomic_inc(&vcpu->arch.nmi_queued); 690 kvm_make_request(KVM_REQ_NMI, vcpu); 691 } 692 EXPORT_SYMBOL_GPL(kvm_inject_nmi); 693 694 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 695 { 696 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, false); 697 } 698 EXPORT_SYMBOL_GPL(kvm_queue_exception_e); 699 700 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 701 { 702 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, true); 703 } 704 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); 705 706 /* 707 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue 708 * a #GP and return false. 709 */ 710 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) 711 { 712 if (static_call(kvm_x86_get_cpl)(vcpu) <= required_cpl) 713 return true; 714 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 715 return false; 716 } 717 EXPORT_SYMBOL_GPL(kvm_require_cpl); 718 719 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr) 720 { 721 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE)) 722 return true; 723 724 kvm_queue_exception(vcpu, UD_VECTOR); 725 return false; 726 } 727 EXPORT_SYMBOL_GPL(kvm_require_dr); 728 729 /* 730 * This function will be used to read from the physical memory of the currently 731 * running guest. The difference to kvm_vcpu_read_guest_page is that this function 732 * can read from guest physical or from the guest's guest physical memory. 733 */ 734 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, 735 gfn_t ngfn, void *data, int offset, int len, 736 u32 access) 737 { 738 struct x86_exception exception; 739 gfn_t real_gfn; 740 gpa_t ngpa; 741 742 ngpa = gfn_to_gpa(ngfn); 743 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception); 744 if (real_gfn == UNMAPPED_GVA) 745 return -EFAULT; 746 747 real_gfn = gpa_to_gfn(real_gfn); 748 749 return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len); 750 } 751 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); 752 753 static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, 754 void *data, int offset, int len, u32 access) 755 { 756 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, 757 data, offset, len, access); 758 } 759 760 static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu) 761 { 762 return vcpu->arch.reserved_gpa_bits | rsvd_bits(5, 8) | rsvd_bits(1, 2); 763 } 764 765 /* 766 * Load the pae pdptrs. Return 1 if they are all valid, 0 otherwise. 767 */ 768 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) 769 { 770 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; 771 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; 772 int i; 773 int ret; 774 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; 775 776 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, 777 offset * sizeof(u64), sizeof(pdpte), 778 PFERR_USER_MASK|PFERR_WRITE_MASK); 779 if (ret < 0) { 780 ret = 0; 781 goto out; 782 } 783 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { 784 if ((pdpte[i] & PT_PRESENT_MASK) && 785 (pdpte[i] & pdptr_rsvd_bits(vcpu))) { 786 ret = 0; 787 goto out; 788 } 789 } 790 ret = 1; 791 792 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); 793 kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR); 794 795 out: 796 797 return ret; 798 } 799 EXPORT_SYMBOL_GPL(load_pdptrs); 800 801 bool pdptrs_changed(struct kvm_vcpu *vcpu) 802 { 803 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; 804 int offset; 805 gfn_t gfn; 806 int r; 807 808 if (!is_pae_paging(vcpu)) 809 return false; 810 811 if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR)) 812 return true; 813 814 gfn = (kvm_read_cr3(vcpu) & 0xffffffe0ul) >> PAGE_SHIFT; 815 offset = (kvm_read_cr3(vcpu) & 0xffffffe0ul) & (PAGE_SIZE - 1); 816 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), 817 PFERR_USER_MASK | PFERR_WRITE_MASK); 818 if (r < 0) 819 return true; 820 821 return memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; 822 } 823 EXPORT_SYMBOL_GPL(pdptrs_changed); 824 825 void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0) 826 { 827 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP; 828 829 if ((cr0 ^ old_cr0) & X86_CR0_PG) { 830 kvm_clear_async_pf_completion_queue(vcpu); 831 kvm_async_pf_hash_reset(vcpu); 832 } 833 834 if ((cr0 ^ old_cr0) & update_bits) 835 kvm_mmu_reset_context(vcpu); 836 837 if (((cr0 ^ old_cr0) & X86_CR0_CD) && 838 kvm_arch_has_noncoherent_dma(vcpu->kvm) && 839 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) 840 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL); 841 } 842 EXPORT_SYMBOL_GPL(kvm_post_set_cr0); 843 844 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) 845 { 846 unsigned long old_cr0 = kvm_read_cr0(vcpu); 847 unsigned long pdptr_bits = X86_CR0_CD | X86_CR0_NW | X86_CR0_PG; 848 849 cr0 |= X86_CR0_ET; 850 851 #ifdef CONFIG_X86_64 852 if (cr0 & 0xffffffff00000000UL) 853 return 1; 854 #endif 855 856 cr0 &= ~CR0_RESERVED_BITS; 857 858 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) 859 return 1; 860 861 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) 862 return 1; 863 864 #ifdef CONFIG_X86_64 865 if ((vcpu->arch.efer & EFER_LME) && !is_paging(vcpu) && 866 (cr0 & X86_CR0_PG)) { 867 int cs_db, cs_l; 868 869 if (!is_pae(vcpu)) 870 return 1; 871 static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l); 872 if (cs_l) 873 return 1; 874 } 875 #endif 876 if (!(vcpu->arch.efer & EFER_LME) && (cr0 & X86_CR0_PG) && 877 is_pae(vcpu) && ((cr0 ^ old_cr0) & pdptr_bits) && 878 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu))) 879 return 1; 880 881 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) 882 return 1; 883 884 static_call(kvm_x86_set_cr0)(vcpu, cr0); 885 886 kvm_post_set_cr0(vcpu, old_cr0, cr0); 887 888 return 0; 889 } 890 EXPORT_SYMBOL_GPL(kvm_set_cr0); 891 892 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) 893 { 894 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); 895 } 896 EXPORT_SYMBOL_GPL(kvm_lmsw); 897 898 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu) 899 { 900 if (vcpu->arch.guest_state_protected) 901 return; 902 903 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) { 904 905 if (vcpu->arch.xcr0 != host_xcr0) 906 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0); 907 908 if (vcpu->arch.xsaves_enabled && 909 vcpu->arch.ia32_xss != host_xss) 910 wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss); 911 } 912 913 if (static_cpu_has(X86_FEATURE_PKU) && 914 (kvm_read_cr4_bits(vcpu, X86_CR4_PKE) || 915 (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU)) && 916 vcpu->arch.pkru != vcpu->arch.host_pkru) 917 __write_pkru(vcpu->arch.pkru); 918 } 919 EXPORT_SYMBOL_GPL(kvm_load_guest_xsave_state); 920 921 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu) 922 { 923 if (vcpu->arch.guest_state_protected) 924 return; 925 926 if (static_cpu_has(X86_FEATURE_PKU) && 927 (kvm_read_cr4_bits(vcpu, X86_CR4_PKE) || 928 (vcpu->arch.xcr0 & XFEATURE_MASK_PKRU))) { 929 vcpu->arch.pkru = rdpkru(); 930 if (vcpu->arch.pkru != vcpu->arch.host_pkru) 931 __write_pkru(vcpu->arch.host_pkru); 932 } 933 934 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) { 935 936 if (vcpu->arch.xcr0 != host_xcr0) 937 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0); 938 939 if (vcpu->arch.xsaves_enabled && 940 vcpu->arch.ia32_xss != host_xss) 941 wrmsrl(MSR_IA32_XSS, host_xss); 942 } 943 944 } 945 EXPORT_SYMBOL_GPL(kvm_load_host_xsave_state); 946 947 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 948 { 949 u64 xcr0 = xcr; 950 u64 old_xcr0 = vcpu->arch.xcr0; 951 u64 valid_bits; 952 953 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ 954 if (index != XCR_XFEATURE_ENABLED_MASK) 955 return 1; 956 if (!(xcr0 & XFEATURE_MASK_FP)) 957 return 1; 958 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE)) 959 return 1; 960 961 /* 962 * Do not allow the guest to set bits that we do not support 963 * saving. However, xcr0 bit 0 is always set, even if the 964 * emulated CPU does not support XSAVE (see fx_init). 965 */ 966 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP; 967 if (xcr0 & ~valid_bits) 968 return 1; 969 970 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) != 971 (!(xcr0 & XFEATURE_MASK_BNDCSR))) 972 return 1; 973 974 if (xcr0 & XFEATURE_MASK_AVX512) { 975 if (!(xcr0 & XFEATURE_MASK_YMM)) 976 return 1; 977 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512) 978 return 1; 979 } 980 vcpu->arch.xcr0 = xcr0; 981 982 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND) 983 kvm_update_cpuid_runtime(vcpu); 984 return 0; 985 } 986 987 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 988 { 989 if (static_call(kvm_x86_get_cpl)(vcpu) == 0) 990 return __kvm_set_xcr(vcpu, index, xcr); 991 992 return 1; 993 } 994 EXPORT_SYMBOL_GPL(kvm_set_xcr); 995 996 bool kvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 997 { 998 if (cr4 & cr4_reserved_bits) 999 return false; 1000 1001 if (cr4 & vcpu->arch.cr4_guest_rsvd_bits) 1002 return false; 1003 1004 return static_call(kvm_x86_is_valid_cr4)(vcpu, cr4); 1005 } 1006 EXPORT_SYMBOL_GPL(kvm_is_valid_cr4); 1007 1008 void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4) 1009 { 1010 unsigned long mmu_role_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | 1011 X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE; 1012 1013 if (((cr4 ^ old_cr4) & mmu_role_bits) || 1014 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))) 1015 kvm_mmu_reset_context(vcpu); 1016 } 1017 EXPORT_SYMBOL_GPL(kvm_post_set_cr4); 1018 1019 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 1020 { 1021 unsigned long old_cr4 = kvm_read_cr4(vcpu); 1022 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | 1023 X86_CR4_SMEP; 1024 1025 if (!kvm_is_valid_cr4(vcpu, cr4)) 1026 return 1; 1027 1028 if (is_long_mode(vcpu)) { 1029 if (!(cr4 & X86_CR4_PAE)) 1030 return 1; 1031 if ((cr4 ^ old_cr4) & X86_CR4_LA57) 1032 return 1; 1033 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) 1034 && ((cr4 ^ old_cr4) & pdptr_bits) 1035 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 1036 kvm_read_cr3(vcpu))) 1037 return 1; 1038 1039 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) { 1040 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID)) 1041 return 1; 1042 1043 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */ 1044 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu)) 1045 return 1; 1046 } 1047 1048 static_call(kvm_x86_set_cr4)(vcpu, cr4); 1049 1050 kvm_post_set_cr4(vcpu, old_cr4, cr4); 1051 1052 return 0; 1053 } 1054 EXPORT_SYMBOL_GPL(kvm_set_cr4); 1055 1056 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 1057 { 1058 bool skip_tlb_flush = false; 1059 #ifdef CONFIG_X86_64 1060 bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); 1061 1062 if (pcid_enabled) { 1063 skip_tlb_flush = cr3 & X86_CR3_PCID_NOFLUSH; 1064 cr3 &= ~X86_CR3_PCID_NOFLUSH; 1065 } 1066 #endif 1067 1068 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { 1069 if (!skip_tlb_flush) { 1070 kvm_mmu_sync_roots(vcpu); 1071 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 1072 } 1073 return 0; 1074 } 1075 1076 if (is_long_mode(vcpu) && kvm_vcpu_is_illegal_gpa(vcpu, cr3)) 1077 return 1; 1078 else if (is_pae_paging(vcpu) && 1079 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 1080 return 1; 1081 1082 kvm_mmu_new_pgd(vcpu, cr3, skip_tlb_flush, skip_tlb_flush); 1083 vcpu->arch.cr3 = cr3; 1084 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 1085 1086 return 0; 1087 } 1088 EXPORT_SYMBOL_GPL(kvm_set_cr3); 1089 1090 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) 1091 { 1092 if (cr8 & CR8_RESERVED_BITS) 1093 return 1; 1094 if (lapic_in_kernel(vcpu)) 1095 kvm_lapic_set_tpr(vcpu, cr8); 1096 else 1097 vcpu->arch.cr8 = cr8; 1098 return 0; 1099 } 1100 EXPORT_SYMBOL_GPL(kvm_set_cr8); 1101 1102 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) 1103 { 1104 if (lapic_in_kernel(vcpu)) 1105 return kvm_lapic_get_cr8(vcpu); 1106 else 1107 return vcpu->arch.cr8; 1108 } 1109 EXPORT_SYMBOL_GPL(kvm_get_cr8); 1110 1111 static void kvm_update_dr0123(struct kvm_vcpu *vcpu) 1112 { 1113 int i; 1114 1115 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { 1116 for (i = 0; i < KVM_NR_DB_REGS; i++) 1117 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 1118 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD; 1119 } 1120 } 1121 1122 void kvm_update_dr7(struct kvm_vcpu *vcpu) 1123 { 1124 unsigned long dr7; 1125 1126 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 1127 dr7 = vcpu->arch.guest_debug_dr7; 1128 else 1129 dr7 = vcpu->arch.dr7; 1130 static_call(kvm_x86_set_dr7)(vcpu, dr7); 1131 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED; 1132 if (dr7 & DR7_BP_EN_MASK) 1133 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED; 1134 } 1135 EXPORT_SYMBOL_GPL(kvm_update_dr7); 1136 1137 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu) 1138 { 1139 u64 fixed = DR6_FIXED_1; 1140 1141 if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM)) 1142 fixed |= DR6_RTM; 1143 return fixed; 1144 } 1145 1146 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 1147 { 1148 size_t size = ARRAY_SIZE(vcpu->arch.db); 1149 1150 switch (dr) { 1151 case 0 ... 3: 1152 vcpu->arch.db[array_index_nospec(dr, size)] = val; 1153 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 1154 vcpu->arch.eff_db[dr] = val; 1155 break; 1156 case 4: 1157 case 6: 1158 if (!kvm_dr6_valid(val)) 1159 return 1; /* #GP */ 1160 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu); 1161 break; 1162 case 5: 1163 default: /* 7 */ 1164 if (!kvm_dr7_valid(val)) 1165 return 1; /* #GP */ 1166 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; 1167 kvm_update_dr7(vcpu); 1168 break; 1169 } 1170 1171 return 0; 1172 } 1173 EXPORT_SYMBOL_GPL(kvm_set_dr); 1174 1175 void kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) 1176 { 1177 size_t size = ARRAY_SIZE(vcpu->arch.db); 1178 1179 switch (dr) { 1180 case 0 ... 3: 1181 *val = vcpu->arch.db[array_index_nospec(dr, size)]; 1182 break; 1183 case 4: 1184 case 6: 1185 *val = vcpu->arch.dr6; 1186 break; 1187 case 5: 1188 default: /* 7 */ 1189 *val = vcpu->arch.dr7; 1190 break; 1191 } 1192 } 1193 EXPORT_SYMBOL_GPL(kvm_get_dr); 1194 1195 bool kvm_rdpmc(struct kvm_vcpu *vcpu) 1196 { 1197 u32 ecx = kvm_rcx_read(vcpu); 1198 u64 data; 1199 int err; 1200 1201 err = kvm_pmu_rdpmc(vcpu, ecx, &data); 1202 if (err) 1203 return err; 1204 kvm_rax_write(vcpu, (u32)data); 1205 kvm_rdx_write(vcpu, data >> 32); 1206 return err; 1207 } 1208 EXPORT_SYMBOL_GPL(kvm_rdpmc); 1209 1210 /* 1211 * List of msr numbers which we expose to userspace through KVM_GET_MSRS 1212 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. 1213 * 1214 * The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features) 1215 * extract the supported MSRs from the related const lists. 1216 * msrs_to_save is selected from the msrs_to_save_all to reflect the 1217 * capabilities of the host cpu. This capabilities test skips MSRs that are 1218 * kvm-specific. Those are put in emulated_msrs_all; filtering of emulated_msrs 1219 * may depend on host virtualization features rather than host cpu features. 1220 */ 1221 1222 static const u32 msrs_to_save_all[] = { 1223 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, 1224 MSR_STAR, 1225 #ifdef CONFIG_X86_64 1226 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, 1227 #endif 1228 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA, 1229 MSR_IA32_FEAT_CTL, MSR_IA32_BNDCFGS, MSR_TSC_AUX, 1230 MSR_IA32_SPEC_CTRL, 1231 MSR_IA32_RTIT_CTL, MSR_IA32_RTIT_STATUS, MSR_IA32_RTIT_CR3_MATCH, 1232 MSR_IA32_RTIT_OUTPUT_BASE, MSR_IA32_RTIT_OUTPUT_MASK, 1233 MSR_IA32_RTIT_ADDR0_A, MSR_IA32_RTIT_ADDR0_B, 1234 MSR_IA32_RTIT_ADDR1_A, MSR_IA32_RTIT_ADDR1_B, 1235 MSR_IA32_RTIT_ADDR2_A, MSR_IA32_RTIT_ADDR2_B, 1236 MSR_IA32_RTIT_ADDR3_A, MSR_IA32_RTIT_ADDR3_B, 1237 MSR_IA32_UMWAIT_CONTROL, 1238 1239 MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1, 1240 MSR_ARCH_PERFMON_FIXED_CTR0 + 2, MSR_ARCH_PERFMON_FIXED_CTR0 + 3, 1241 MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS, 1242 MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL, 1243 MSR_ARCH_PERFMON_PERFCTR0, MSR_ARCH_PERFMON_PERFCTR1, 1244 MSR_ARCH_PERFMON_PERFCTR0 + 2, MSR_ARCH_PERFMON_PERFCTR0 + 3, 1245 MSR_ARCH_PERFMON_PERFCTR0 + 4, MSR_ARCH_PERFMON_PERFCTR0 + 5, 1246 MSR_ARCH_PERFMON_PERFCTR0 + 6, MSR_ARCH_PERFMON_PERFCTR0 + 7, 1247 MSR_ARCH_PERFMON_PERFCTR0 + 8, MSR_ARCH_PERFMON_PERFCTR0 + 9, 1248 MSR_ARCH_PERFMON_PERFCTR0 + 10, MSR_ARCH_PERFMON_PERFCTR0 + 11, 1249 MSR_ARCH_PERFMON_PERFCTR0 + 12, MSR_ARCH_PERFMON_PERFCTR0 + 13, 1250 MSR_ARCH_PERFMON_PERFCTR0 + 14, MSR_ARCH_PERFMON_PERFCTR0 + 15, 1251 MSR_ARCH_PERFMON_PERFCTR0 + 16, MSR_ARCH_PERFMON_PERFCTR0 + 17, 1252 MSR_ARCH_PERFMON_EVENTSEL0, MSR_ARCH_PERFMON_EVENTSEL1, 1253 MSR_ARCH_PERFMON_EVENTSEL0 + 2, MSR_ARCH_PERFMON_EVENTSEL0 + 3, 1254 MSR_ARCH_PERFMON_EVENTSEL0 + 4, MSR_ARCH_PERFMON_EVENTSEL0 + 5, 1255 MSR_ARCH_PERFMON_EVENTSEL0 + 6, MSR_ARCH_PERFMON_EVENTSEL0 + 7, 1256 MSR_ARCH_PERFMON_EVENTSEL0 + 8, MSR_ARCH_PERFMON_EVENTSEL0 + 9, 1257 MSR_ARCH_PERFMON_EVENTSEL0 + 10, MSR_ARCH_PERFMON_EVENTSEL0 + 11, 1258 MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13, 1259 MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15, 1260 MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17, 1261 }; 1262 1263 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)]; 1264 static unsigned num_msrs_to_save; 1265 1266 static const u32 emulated_msrs_all[] = { 1267 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, 1268 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, 1269 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, 1270 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC, 1271 HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY, 1272 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2, 1273 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL, 1274 HV_X64_MSR_RESET, 1275 HV_X64_MSR_VP_INDEX, 1276 HV_X64_MSR_VP_RUNTIME, 1277 HV_X64_MSR_SCONTROL, 1278 HV_X64_MSR_STIMER0_CONFIG, 1279 HV_X64_MSR_VP_ASSIST_PAGE, 1280 HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL, 1281 HV_X64_MSR_TSC_EMULATION_STATUS, 1282 HV_X64_MSR_SYNDBG_OPTIONS, 1283 HV_X64_MSR_SYNDBG_CONTROL, HV_X64_MSR_SYNDBG_STATUS, 1284 HV_X64_MSR_SYNDBG_SEND_BUFFER, HV_X64_MSR_SYNDBG_RECV_BUFFER, 1285 HV_X64_MSR_SYNDBG_PENDING_BUFFER, 1286 1287 MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, 1288 MSR_KVM_PV_EOI_EN, MSR_KVM_ASYNC_PF_INT, MSR_KVM_ASYNC_PF_ACK, 1289 1290 MSR_IA32_TSC_ADJUST, 1291 MSR_IA32_TSCDEADLINE, 1292 MSR_IA32_ARCH_CAPABILITIES, 1293 MSR_IA32_PERF_CAPABILITIES, 1294 MSR_IA32_MISC_ENABLE, 1295 MSR_IA32_MCG_STATUS, 1296 MSR_IA32_MCG_CTL, 1297 MSR_IA32_MCG_EXT_CTL, 1298 MSR_IA32_SMBASE, 1299 MSR_SMI_COUNT, 1300 MSR_PLATFORM_INFO, 1301 MSR_MISC_FEATURES_ENABLES, 1302 MSR_AMD64_VIRT_SPEC_CTRL, 1303 MSR_IA32_POWER_CTL, 1304 MSR_IA32_UCODE_REV, 1305 1306 /* 1307 * The following list leaves out MSRs whose values are determined 1308 * by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs. 1309 * We always support the "true" VMX control MSRs, even if the host 1310 * processor does not, so I am putting these registers here rather 1311 * than in msrs_to_save_all. 1312 */ 1313 MSR_IA32_VMX_BASIC, 1314 MSR_IA32_VMX_TRUE_PINBASED_CTLS, 1315 MSR_IA32_VMX_TRUE_PROCBASED_CTLS, 1316 MSR_IA32_VMX_TRUE_EXIT_CTLS, 1317 MSR_IA32_VMX_TRUE_ENTRY_CTLS, 1318 MSR_IA32_VMX_MISC, 1319 MSR_IA32_VMX_CR0_FIXED0, 1320 MSR_IA32_VMX_CR4_FIXED0, 1321 MSR_IA32_VMX_VMCS_ENUM, 1322 MSR_IA32_VMX_PROCBASED_CTLS2, 1323 MSR_IA32_VMX_EPT_VPID_CAP, 1324 MSR_IA32_VMX_VMFUNC, 1325 1326 MSR_K7_HWCR, 1327 MSR_KVM_POLL_CONTROL, 1328 }; 1329 1330 static u32 emulated_msrs[ARRAY_SIZE(emulated_msrs_all)]; 1331 static unsigned num_emulated_msrs; 1332 1333 /* 1334 * List of msr numbers which are used to expose MSR-based features that 1335 * can be used by a hypervisor to validate requested CPU features. 1336 */ 1337 static const u32 msr_based_features_all[] = { 1338 MSR_IA32_VMX_BASIC, 1339 MSR_IA32_VMX_TRUE_PINBASED_CTLS, 1340 MSR_IA32_VMX_PINBASED_CTLS, 1341 MSR_IA32_VMX_TRUE_PROCBASED_CTLS, 1342 MSR_IA32_VMX_PROCBASED_CTLS, 1343 MSR_IA32_VMX_TRUE_EXIT_CTLS, 1344 MSR_IA32_VMX_EXIT_CTLS, 1345 MSR_IA32_VMX_TRUE_ENTRY_CTLS, 1346 MSR_IA32_VMX_ENTRY_CTLS, 1347 MSR_IA32_VMX_MISC, 1348 MSR_IA32_VMX_CR0_FIXED0, 1349 MSR_IA32_VMX_CR0_FIXED1, 1350 MSR_IA32_VMX_CR4_FIXED0, 1351 MSR_IA32_VMX_CR4_FIXED1, 1352 MSR_IA32_VMX_VMCS_ENUM, 1353 MSR_IA32_VMX_PROCBASED_CTLS2, 1354 MSR_IA32_VMX_EPT_VPID_CAP, 1355 MSR_IA32_VMX_VMFUNC, 1356 1357 MSR_F10H_DECFG, 1358 MSR_IA32_UCODE_REV, 1359 MSR_IA32_ARCH_CAPABILITIES, 1360 MSR_IA32_PERF_CAPABILITIES, 1361 }; 1362 1363 static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all)]; 1364 static unsigned int num_msr_based_features; 1365 1366 static u64 kvm_get_arch_capabilities(void) 1367 { 1368 u64 data = 0; 1369 1370 if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) 1371 rdmsrl(MSR_IA32_ARCH_CAPABILITIES, data); 1372 1373 /* 1374 * If nx_huge_pages is enabled, KVM's shadow paging will ensure that 1375 * the nested hypervisor runs with NX huge pages. If it is not, 1376 * L1 is anyway vulnerable to ITLB_MULTIHIT explots from other 1377 * L1 guests, so it need not worry about its own (L2) guests. 1378 */ 1379 data |= ARCH_CAP_PSCHANGE_MC_NO; 1380 1381 /* 1382 * If we're doing cache flushes (either "always" or "cond") 1383 * we will do one whenever the guest does a vmlaunch/vmresume. 1384 * If an outer hypervisor is doing the cache flush for us 1385 * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that 1386 * capability to the guest too, and if EPT is disabled we're not 1387 * vulnerable. Overall, only VMENTER_L1D_FLUSH_NEVER will 1388 * require a nested hypervisor to do a flush of its own. 1389 */ 1390 if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER) 1391 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH; 1392 1393 if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) 1394 data |= ARCH_CAP_RDCL_NO; 1395 if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) 1396 data |= ARCH_CAP_SSB_NO; 1397 if (!boot_cpu_has_bug(X86_BUG_MDS)) 1398 data |= ARCH_CAP_MDS_NO; 1399 1400 if (!boot_cpu_has(X86_FEATURE_RTM)) { 1401 /* 1402 * If RTM=0 because the kernel has disabled TSX, the host might 1403 * have TAA_NO or TSX_CTRL. Clear TAA_NO (the guest sees RTM=0 1404 * and therefore knows that there cannot be TAA) but keep 1405 * TSX_CTRL: some buggy userspaces leave it set on tsx=on hosts, 1406 * and we want to allow migrating those guests to tsx=off hosts. 1407 */ 1408 data &= ~ARCH_CAP_TAA_NO; 1409 } else if (!boot_cpu_has_bug(X86_BUG_TAA)) { 1410 data |= ARCH_CAP_TAA_NO; 1411 } else { 1412 /* 1413 * Nothing to do here; we emulate TSX_CTRL if present on the 1414 * host so the guest can choose between disabling TSX or 1415 * using VERW to clear CPU buffers. 1416 */ 1417 } 1418 1419 return data; 1420 } 1421 1422 static int kvm_get_msr_feature(struct kvm_msr_entry *msr) 1423 { 1424 switch (msr->index) { 1425 case MSR_IA32_ARCH_CAPABILITIES: 1426 msr->data = kvm_get_arch_capabilities(); 1427 break; 1428 case MSR_IA32_UCODE_REV: 1429 rdmsrl_safe(msr->index, &msr->data); 1430 break; 1431 default: 1432 return static_call(kvm_x86_get_msr_feature)(msr); 1433 } 1434 return 0; 1435 } 1436 1437 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1438 { 1439 struct kvm_msr_entry msr; 1440 int r; 1441 1442 msr.index = index; 1443 r = kvm_get_msr_feature(&msr); 1444 1445 if (r == KVM_MSR_RET_INVALID) { 1446 /* Unconditionally clear the output for simplicity */ 1447 *data = 0; 1448 if (kvm_msr_ignored_check(vcpu, index, 0, false)) 1449 r = 0; 1450 } 1451 1452 if (r) 1453 return r; 1454 1455 *data = msr.data; 1456 1457 return 0; 1458 } 1459 1460 static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1461 { 1462 if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT)) 1463 return false; 1464 1465 if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM)) 1466 return false; 1467 1468 if (efer & (EFER_LME | EFER_LMA) && 1469 !guest_cpuid_has(vcpu, X86_FEATURE_LM)) 1470 return false; 1471 1472 if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX)) 1473 return false; 1474 1475 return true; 1476 1477 } 1478 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1479 { 1480 if (efer & efer_reserved_bits) 1481 return false; 1482 1483 return __kvm_valid_efer(vcpu, efer); 1484 } 1485 EXPORT_SYMBOL_GPL(kvm_valid_efer); 1486 1487 static int set_efer(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 1488 { 1489 u64 old_efer = vcpu->arch.efer; 1490 u64 efer = msr_info->data; 1491 int r; 1492 1493 if (efer & efer_reserved_bits) 1494 return 1; 1495 1496 if (!msr_info->host_initiated) { 1497 if (!__kvm_valid_efer(vcpu, efer)) 1498 return 1; 1499 1500 if (is_paging(vcpu) && 1501 (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) 1502 return 1; 1503 } 1504 1505 efer &= ~EFER_LMA; 1506 efer |= vcpu->arch.efer & EFER_LMA; 1507 1508 r = static_call(kvm_x86_set_efer)(vcpu, efer); 1509 if (r) { 1510 WARN_ON(r > 0); 1511 return r; 1512 } 1513 1514 /* Update reserved bits */ 1515 if ((efer ^ old_efer) & EFER_NX) 1516 kvm_mmu_reset_context(vcpu); 1517 1518 return 0; 1519 } 1520 1521 void kvm_enable_efer_bits(u64 mask) 1522 { 1523 efer_reserved_bits &= ~mask; 1524 } 1525 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); 1526 1527 bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type) 1528 { 1529 struct kvm *kvm = vcpu->kvm; 1530 struct msr_bitmap_range *ranges = kvm->arch.msr_filter.ranges; 1531 u32 count = kvm->arch.msr_filter.count; 1532 u32 i; 1533 bool r = kvm->arch.msr_filter.default_allow; 1534 int idx; 1535 1536 /* MSR filtering not set up or x2APIC enabled, allow everything */ 1537 if (!count || (index >= 0x800 && index <= 0x8ff)) 1538 return true; 1539 1540 /* Prevent collision with set_msr_filter */ 1541 idx = srcu_read_lock(&kvm->srcu); 1542 1543 for (i = 0; i < count; i++) { 1544 u32 start = ranges[i].base; 1545 u32 end = start + ranges[i].nmsrs; 1546 u32 flags = ranges[i].flags; 1547 unsigned long *bitmap = ranges[i].bitmap; 1548 1549 if ((index >= start) && (index < end) && (flags & type)) { 1550 r = !!test_bit(index - start, bitmap); 1551 break; 1552 } 1553 } 1554 1555 srcu_read_unlock(&kvm->srcu, idx); 1556 1557 return r; 1558 } 1559 EXPORT_SYMBOL_GPL(kvm_msr_allowed); 1560 1561 /* 1562 * Write @data into the MSR specified by @index. Select MSR specific fault 1563 * checks are bypassed if @host_initiated is %true. 1564 * Returns 0 on success, non-0 otherwise. 1565 * Assumes vcpu_load() was already called. 1566 */ 1567 static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data, 1568 bool host_initiated) 1569 { 1570 struct msr_data msr; 1571 1572 if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE)) 1573 return KVM_MSR_RET_FILTERED; 1574 1575 switch (index) { 1576 case MSR_FS_BASE: 1577 case MSR_GS_BASE: 1578 case MSR_KERNEL_GS_BASE: 1579 case MSR_CSTAR: 1580 case MSR_LSTAR: 1581 if (is_noncanonical_address(data, vcpu)) 1582 return 1; 1583 break; 1584 case MSR_IA32_SYSENTER_EIP: 1585 case MSR_IA32_SYSENTER_ESP: 1586 /* 1587 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if 1588 * non-canonical address is written on Intel but not on 1589 * AMD (which ignores the top 32-bits, because it does 1590 * not implement 64-bit SYSENTER). 1591 * 1592 * 64-bit code should hence be able to write a non-canonical 1593 * value on AMD. Making the address canonical ensures that 1594 * vmentry does not fail on Intel after writing a non-canonical 1595 * value, and that something deterministic happens if the guest 1596 * invokes 64-bit SYSENTER. 1597 */ 1598 data = get_canonical(data, vcpu_virt_addr_bits(vcpu)); 1599 } 1600 1601 msr.data = data; 1602 msr.index = index; 1603 msr.host_initiated = host_initiated; 1604 1605 return static_call(kvm_x86_set_msr)(vcpu, &msr); 1606 } 1607 1608 static int kvm_set_msr_ignored_check(struct kvm_vcpu *vcpu, 1609 u32 index, u64 data, bool host_initiated) 1610 { 1611 int ret = __kvm_set_msr(vcpu, index, data, host_initiated); 1612 1613 if (ret == KVM_MSR_RET_INVALID) 1614 if (kvm_msr_ignored_check(vcpu, index, data, true)) 1615 ret = 0; 1616 1617 return ret; 1618 } 1619 1620 /* 1621 * Read the MSR specified by @index into @data. Select MSR specific fault 1622 * checks are bypassed if @host_initiated is %true. 1623 * Returns 0 on success, non-0 otherwise. 1624 * Assumes vcpu_load() was already called. 1625 */ 1626 int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data, 1627 bool host_initiated) 1628 { 1629 struct msr_data msr; 1630 int ret; 1631 1632 if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ)) 1633 return KVM_MSR_RET_FILTERED; 1634 1635 msr.index = index; 1636 msr.host_initiated = host_initiated; 1637 1638 ret = static_call(kvm_x86_get_msr)(vcpu, &msr); 1639 if (!ret) 1640 *data = msr.data; 1641 return ret; 1642 } 1643 1644 static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu, 1645 u32 index, u64 *data, bool host_initiated) 1646 { 1647 int ret = __kvm_get_msr(vcpu, index, data, host_initiated); 1648 1649 if (ret == KVM_MSR_RET_INVALID) { 1650 /* Unconditionally clear *data for simplicity */ 1651 *data = 0; 1652 if (kvm_msr_ignored_check(vcpu, index, 0, false)) 1653 ret = 0; 1654 } 1655 1656 return ret; 1657 } 1658 1659 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data) 1660 { 1661 return kvm_get_msr_ignored_check(vcpu, index, data, false); 1662 } 1663 EXPORT_SYMBOL_GPL(kvm_get_msr); 1664 1665 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data) 1666 { 1667 return kvm_set_msr_ignored_check(vcpu, index, data, false); 1668 } 1669 EXPORT_SYMBOL_GPL(kvm_set_msr); 1670 1671 static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu) 1672 { 1673 int err = vcpu->run->msr.error; 1674 if (!err) { 1675 kvm_rax_write(vcpu, (u32)vcpu->run->msr.data); 1676 kvm_rdx_write(vcpu, vcpu->run->msr.data >> 32); 1677 } 1678 1679 return static_call(kvm_x86_complete_emulated_msr)(vcpu, err); 1680 } 1681 1682 static int complete_emulated_wrmsr(struct kvm_vcpu *vcpu) 1683 { 1684 return static_call(kvm_x86_complete_emulated_msr)(vcpu, vcpu->run->msr.error); 1685 } 1686 1687 static u64 kvm_msr_reason(int r) 1688 { 1689 switch (r) { 1690 case KVM_MSR_RET_INVALID: 1691 return KVM_MSR_EXIT_REASON_UNKNOWN; 1692 case KVM_MSR_RET_FILTERED: 1693 return KVM_MSR_EXIT_REASON_FILTER; 1694 default: 1695 return KVM_MSR_EXIT_REASON_INVAL; 1696 } 1697 } 1698 1699 static int kvm_msr_user_space(struct kvm_vcpu *vcpu, u32 index, 1700 u32 exit_reason, u64 data, 1701 int (*completion)(struct kvm_vcpu *vcpu), 1702 int r) 1703 { 1704 u64 msr_reason = kvm_msr_reason(r); 1705 1706 /* Check if the user wanted to know about this MSR fault */ 1707 if (!(vcpu->kvm->arch.user_space_msr_mask & msr_reason)) 1708 return 0; 1709 1710 vcpu->run->exit_reason = exit_reason; 1711 vcpu->run->msr.error = 0; 1712 memset(vcpu->run->msr.pad, 0, sizeof(vcpu->run->msr.pad)); 1713 vcpu->run->msr.reason = msr_reason; 1714 vcpu->run->msr.index = index; 1715 vcpu->run->msr.data = data; 1716 vcpu->arch.complete_userspace_io = completion; 1717 1718 return 1; 1719 } 1720 1721 static int kvm_get_msr_user_space(struct kvm_vcpu *vcpu, u32 index, int r) 1722 { 1723 return kvm_msr_user_space(vcpu, index, KVM_EXIT_X86_RDMSR, 0, 1724 complete_emulated_rdmsr, r); 1725 } 1726 1727 static int kvm_set_msr_user_space(struct kvm_vcpu *vcpu, u32 index, u64 data, int r) 1728 { 1729 return kvm_msr_user_space(vcpu, index, KVM_EXIT_X86_WRMSR, data, 1730 complete_emulated_wrmsr, r); 1731 } 1732 1733 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu) 1734 { 1735 u32 ecx = kvm_rcx_read(vcpu); 1736 u64 data; 1737 int r; 1738 1739 r = kvm_get_msr(vcpu, ecx, &data); 1740 1741 /* MSR read failed? See if we should ask user space */ 1742 if (r && kvm_get_msr_user_space(vcpu, ecx, r)) { 1743 /* Bounce to user space */ 1744 return 0; 1745 } 1746 1747 if (!r) { 1748 trace_kvm_msr_read(ecx, data); 1749 1750 kvm_rax_write(vcpu, data & -1u); 1751 kvm_rdx_write(vcpu, (data >> 32) & -1u); 1752 } else { 1753 trace_kvm_msr_read_ex(ecx); 1754 } 1755 1756 return static_call(kvm_x86_complete_emulated_msr)(vcpu, r); 1757 } 1758 EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr); 1759 1760 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu) 1761 { 1762 u32 ecx = kvm_rcx_read(vcpu); 1763 u64 data = kvm_read_edx_eax(vcpu); 1764 int r; 1765 1766 r = kvm_set_msr(vcpu, ecx, data); 1767 1768 /* MSR write failed? See if we should ask user space */ 1769 if (r && kvm_set_msr_user_space(vcpu, ecx, data, r)) 1770 /* Bounce to user space */ 1771 return 0; 1772 1773 /* Signal all other negative errors to userspace */ 1774 if (r < 0) 1775 return r; 1776 1777 if (!r) 1778 trace_kvm_msr_write(ecx, data); 1779 else 1780 trace_kvm_msr_write_ex(ecx, data); 1781 1782 return static_call(kvm_x86_complete_emulated_msr)(vcpu, r); 1783 } 1784 EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr); 1785 1786 static inline bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu) 1787 { 1788 xfer_to_guest_mode_prepare(); 1789 return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) || 1790 xfer_to_guest_mode_work_pending(); 1791 } 1792 1793 /* 1794 * The fast path for frequent and performance sensitive wrmsr emulation, 1795 * i.e. the sending of IPI, sending IPI early in the VM-Exit flow reduces 1796 * the latency of virtual IPI by avoiding the expensive bits of transitioning 1797 * from guest to host, e.g. reacquiring KVM's SRCU lock. In contrast to the 1798 * other cases which must be called after interrupts are enabled on the host. 1799 */ 1800 static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data) 1801 { 1802 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(vcpu->arch.apic)) 1803 return 1; 1804 1805 if (((data & APIC_SHORT_MASK) == APIC_DEST_NOSHORT) && 1806 ((data & APIC_DEST_MASK) == APIC_DEST_PHYSICAL) && 1807 ((data & APIC_MODE_MASK) == APIC_DM_FIXED) && 1808 ((u32)(data >> 32) != X2APIC_BROADCAST)) { 1809 1810 data &= ~(1 << 12); 1811 kvm_apic_send_ipi(vcpu->arch.apic, (u32)data, (u32)(data >> 32)); 1812 kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR2, (u32)(data >> 32)); 1813 kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR, (u32)data); 1814 trace_kvm_apic_write(APIC_ICR, (u32)data); 1815 return 0; 1816 } 1817 1818 return 1; 1819 } 1820 1821 static int handle_fastpath_set_tscdeadline(struct kvm_vcpu *vcpu, u64 data) 1822 { 1823 if (!kvm_can_use_hv_timer(vcpu)) 1824 return 1; 1825 1826 kvm_set_lapic_tscdeadline_msr(vcpu, data); 1827 return 0; 1828 } 1829 1830 fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu) 1831 { 1832 u32 msr = kvm_rcx_read(vcpu); 1833 u64 data; 1834 fastpath_t ret = EXIT_FASTPATH_NONE; 1835 1836 switch (msr) { 1837 case APIC_BASE_MSR + (APIC_ICR >> 4): 1838 data = kvm_read_edx_eax(vcpu); 1839 if (!handle_fastpath_set_x2apic_icr_irqoff(vcpu, data)) { 1840 kvm_skip_emulated_instruction(vcpu); 1841 ret = EXIT_FASTPATH_EXIT_HANDLED; 1842 } 1843 break; 1844 case MSR_IA32_TSCDEADLINE: 1845 data = kvm_read_edx_eax(vcpu); 1846 if (!handle_fastpath_set_tscdeadline(vcpu, data)) { 1847 kvm_skip_emulated_instruction(vcpu); 1848 ret = EXIT_FASTPATH_REENTER_GUEST; 1849 } 1850 break; 1851 default: 1852 break; 1853 } 1854 1855 if (ret != EXIT_FASTPATH_NONE) 1856 trace_kvm_msr_write(msr, data); 1857 1858 return ret; 1859 } 1860 EXPORT_SYMBOL_GPL(handle_fastpath_set_msr_irqoff); 1861 1862 /* 1863 * Adapt set_msr() to msr_io()'s calling convention 1864 */ 1865 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1866 { 1867 return kvm_get_msr_ignored_check(vcpu, index, data, true); 1868 } 1869 1870 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1871 { 1872 return kvm_set_msr_ignored_check(vcpu, index, *data, true); 1873 } 1874 1875 #ifdef CONFIG_X86_64 1876 struct pvclock_clock { 1877 int vclock_mode; 1878 u64 cycle_last; 1879 u64 mask; 1880 u32 mult; 1881 u32 shift; 1882 u64 base_cycles; 1883 u64 offset; 1884 }; 1885 1886 struct pvclock_gtod_data { 1887 seqcount_t seq; 1888 1889 struct pvclock_clock clock; /* extract of a clocksource struct */ 1890 struct pvclock_clock raw_clock; /* extract of a clocksource struct */ 1891 1892 ktime_t offs_boot; 1893 u64 wall_time_sec; 1894 }; 1895 1896 static struct pvclock_gtod_data pvclock_gtod_data; 1897 1898 static void update_pvclock_gtod(struct timekeeper *tk) 1899 { 1900 struct pvclock_gtod_data *vdata = &pvclock_gtod_data; 1901 1902 write_seqcount_begin(&vdata->seq); 1903 1904 /* copy pvclock gtod data */ 1905 vdata->clock.vclock_mode = tk->tkr_mono.clock->vdso_clock_mode; 1906 vdata->clock.cycle_last = tk->tkr_mono.cycle_last; 1907 vdata->clock.mask = tk->tkr_mono.mask; 1908 vdata->clock.mult = tk->tkr_mono.mult; 1909 vdata->clock.shift = tk->tkr_mono.shift; 1910 vdata->clock.base_cycles = tk->tkr_mono.xtime_nsec; 1911 vdata->clock.offset = tk->tkr_mono.base; 1912 1913 vdata->raw_clock.vclock_mode = tk->tkr_raw.clock->vdso_clock_mode; 1914 vdata->raw_clock.cycle_last = tk->tkr_raw.cycle_last; 1915 vdata->raw_clock.mask = tk->tkr_raw.mask; 1916 vdata->raw_clock.mult = tk->tkr_raw.mult; 1917 vdata->raw_clock.shift = tk->tkr_raw.shift; 1918 vdata->raw_clock.base_cycles = tk->tkr_raw.xtime_nsec; 1919 vdata->raw_clock.offset = tk->tkr_raw.base; 1920 1921 vdata->wall_time_sec = tk->xtime_sec; 1922 1923 vdata->offs_boot = tk->offs_boot; 1924 1925 write_seqcount_end(&vdata->seq); 1926 } 1927 1928 static s64 get_kvmclock_base_ns(void) 1929 { 1930 /* Count up from boot time, but with the frequency of the raw clock. */ 1931 return ktime_to_ns(ktime_add(ktime_get_raw(), pvclock_gtod_data.offs_boot)); 1932 } 1933 #else 1934 static s64 get_kvmclock_base_ns(void) 1935 { 1936 /* Master clock not used, so we can just use CLOCK_BOOTTIME. */ 1937 return ktime_get_boottime_ns(); 1938 } 1939 #endif 1940 1941 void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock, int sec_hi_ofs) 1942 { 1943 int version; 1944 int r; 1945 struct pvclock_wall_clock wc; 1946 u32 wc_sec_hi; 1947 u64 wall_nsec; 1948 1949 if (!wall_clock) 1950 return; 1951 1952 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); 1953 if (r) 1954 return; 1955 1956 if (version & 1) 1957 ++version; /* first time write, random junk */ 1958 1959 ++version; 1960 1961 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version))) 1962 return; 1963 1964 /* 1965 * The guest calculates current wall clock time by adding 1966 * system time (updated by kvm_guest_time_update below) to the 1967 * wall clock specified here. We do the reverse here. 1968 */ 1969 wall_nsec = ktime_get_real_ns() - get_kvmclock_ns(kvm); 1970 1971 wc.nsec = do_div(wall_nsec, 1000000000); 1972 wc.sec = (u32)wall_nsec; /* overflow in 2106 guest time */ 1973 wc.version = version; 1974 1975 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); 1976 1977 if (sec_hi_ofs) { 1978 wc_sec_hi = wall_nsec >> 32; 1979 kvm_write_guest(kvm, wall_clock + sec_hi_ofs, 1980 &wc_sec_hi, sizeof(wc_sec_hi)); 1981 } 1982 1983 version++; 1984 kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); 1985 } 1986 1987 static void kvm_write_system_time(struct kvm_vcpu *vcpu, gpa_t system_time, 1988 bool old_msr, bool host_initiated) 1989 { 1990 struct kvm_arch *ka = &vcpu->kvm->arch; 1991 1992 if (vcpu->vcpu_id == 0 && !host_initiated) { 1993 if (ka->boot_vcpu_runs_old_kvmclock != old_msr) 1994 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 1995 1996 ka->boot_vcpu_runs_old_kvmclock = old_msr; 1997 } 1998 1999 vcpu->arch.time = system_time; 2000 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 2001 2002 /* we verify if the enable bit is set... */ 2003 vcpu->arch.pv_time_enabled = false; 2004 if (!(system_time & 1)) 2005 return; 2006 2007 if (!kvm_gfn_to_hva_cache_init(vcpu->kvm, 2008 &vcpu->arch.pv_time, system_time & ~1ULL, 2009 sizeof(struct pvclock_vcpu_time_info))) 2010 vcpu->arch.pv_time_enabled = true; 2011 2012 return; 2013 } 2014 2015 static uint32_t div_frac(uint32_t dividend, uint32_t divisor) 2016 { 2017 do_shl32_div32(dividend, divisor); 2018 return dividend; 2019 } 2020 2021 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz, 2022 s8 *pshift, u32 *pmultiplier) 2023 { 2024 uint64_t scaled64; 2025 int32_t shift = 0; 2026 uint64_t tps64; 2027 uint32_t tps32; 2028 2029 tps64 = base_hz; 2030 scaled64 = scaled_hz; 2031 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { 2032 tps64 >>= 1; 2033 shift--; 2034 } 2035 2036 tps32 = (uint32_t)tps64; 2037 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { 2038 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) 2039 scaled64 >>= 1; 2040 else 2041 tps32 <<= 1; 2042 shift++; 2043 } 2044 2045 *pshift = shift; 2046 *pmultiplier = div_frac(scaled64, tps32); 2047 } 2048 2049 #ifdef CONFIG_X86_64 2050 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0); 2051 #endif 2052 2053 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); 2054 static unsigned long max_tsc_khz; 2055 2056 static u32 adjust_tsc_khz(u32 khz, s32 ppm) 2057 { 2058 u64 v = (u64)khz * (1000000 + ppm); 2059 do_div(v, 1000000); 2060 return v; 2061 } 2062 2063 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) 2064 { 2065 u64 ratio; 2066 2067 /* Guest TSC same frequency as host TSC? */ 2068 if (!scale) { 2069 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 2070 return 0; 2071 } 2072 2073 /* TSC scaling supported? */ 2074 if (!kvm_has_tsc_control) { 2075 if (user_tsc_khz > tsc_khz) { 2076 vcpu->arch.tsc_catchup = 1; 2077 vcpu->arch.tsc_always_catchup = 1; 2078 return 0; 2079 } else { 2080 pr_warn_ratelimited("user requested TSC rate below hardware speed\n"); 2081 return -1; 2082 } 2083 } 2084 2085 /* TSC scaling required - calculate ratio */ 2086 ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits, 2087 user_tsc_khz, tsc_khz); 2088 2089 if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) { 2090 pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n", 2091 user_tsc_khz); 2092 return -1; 2093 } 2094 2095 vcpu->arch.tsc_scaling_ratio = ratio; 2096 return 0; 2097 } 2098 2099 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) 2100 { 2101 u32 thresh_lo, thresh_hi; 2102 int use_scaling = 0; 2103 2104 /* tsc_khz can be zero if TSC calibration fails */ 2105 if (user_tsc_khz == 0) { 2106 /* set tsc_scaling_ratio to a safe value */ 2107 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 2108 return -1; 2109 } 2110 2111 /* Compute a scale to convert nanoseconds in TSC cycles */ 2112 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC, 2113 &vcpu->arch.virtual_tsc_shift, 2114 &vcpu->arch.virtual_tsc_mult); 2115 vcpu->arch.virtual_tsc_khz = user_tsc_khz; 2116 2117 /* 2118 * Compute the variation in TSC rate which is acceptable 2119 * within the range of tolerance and decide if the 2120 * rate being applied is within that bounds of the hardware 2121 * rate. If so, no scaling or compensation need be done. 2122 */ 2123 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm); 2124 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm); 2125 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) { 2126 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi); 2127 use_scaling = 1; 2128 } 2129 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling); 2130 } 2131 2132 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) 2133 { 2134 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec, 2135 vcpu->arch.virtual_tsc_mult, 2136 vcpu->arch.virtual_tsc_shift); 2137 tsc += vcpu->arch.this_tsc_write; 2138 return tsc; 2139 } 2140 2141 static inline int gtod_is_based_on_tsc(int mode) 2142 { 2143 return mode == VDSO_CLOCKMODE_TSC || mode == VDSO_CLOCKMODE_HVCLOCK; 2144 } 2145 2146 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu) 2147 { 2148 #ifdef CONFIG_X86_64 2149 bool vcpus_matched; 2150 struct kvm_arch *ka = &vcpu->kvm->arch; 2151 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2152 2153 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 2154 atomic_read(&vcpu->kvm->online_vcpus)); 2155 2156 /* 2157 * Once the masterclock is enabled, always perform request in 2158 * order to update it. 2159 * 2160 * In order to enable masterclock, the host clocksource must be TSC 2161 * and the vcpus need to have matched TSCs. When that happens, 2162 * perform request to enable masterclock. 2163 */ 2164 if (ka->use_master_clock || 2165 (gtod_is_based_on_tsc(gtod->clock.vclock_mode) && vcpus_matched)) 2166 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 2167 2168 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc, 2169 atomic_read(&vcpu->kvm->online_vcpus), 2170 ka->use_master_clock, gtod->clock.vclock_mode); 2171 #endif 2172 } 2173 2174 /* 2175 * Multiply tsc by a fixed point number represented by ratio. 2176 * 2177 * The most significant 64-N bits (mult) of ratio represent the 2178 * integral part of the fixed point number; the remaining N bits 2179 * (frac) represent the fractional part, ie. ratio represents a fixed 2180 * point number (mult + frac * 2^(-N)). 2181 * 2182 * N equals to kvm_tsc_scaling_ratio_frac_bits. 2183 */ 2184 static inline u64 __scale_tsc(u64 ratio, u64 tsc) 2185 { 2186 return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits); 2187 } 2188 2189 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc) 2190 { 2191 u64 _tsc = tsc; 2192 u64 ratio = vcpu->arch.tsc_scaling_ratio; 2193 2194 if (ratio != kvm_default_tsc_scaling_ratio) 2195 _tsc = __scale_tsc(ratio, tsc); 2196 2197 return _tsc; 2198 } 2199 EXPORT_SYMBOL_GPL(kvm_scale_tsc); 2200 2201 static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) 2202 { 2203 u64 tsc; 2204 2205 tsc = kvm_scale_tsc(vcpu, rdtsc()); 2206 2207 return target_tsc - tsc; 2208 } 2209 2210 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc) 2211 { 2212 return vcpu->arch.l1_tsc_offset + kvm_scale_tsc(vcpu, host_tsc); 2213 } 2214 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc); 2215 2216 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) 2217 { 2218 vcpu->arch.l1_tsc_offset = offset; 2219 vcpu->arch.tsc_offset = static_call(kvm_x86_write_l1_tsc_offset)(vcpu, offset); 2220 } 2221 2222 static inline bool kvm_check_tsc_unstable(void) 2223 { 2224 #ifdef CONFIG_X86_64 2225 /* 2226 * TSC is marked unstable when we're running on Hyper-V, 2227 * 'TSC page' clocksource is good. 2228 */ 2229 if (pvclock_gtod_data.clock.vclock_mode == VDSO_CLOCKMODE_HVCLOCK) 2230 return false; 2231 #endif 2232 return check_tsc_unstable(); 2233 } 2234 2235 static void kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 data) 2236 { 2237 struct kvm *kvm = vcpu->kvm; 2238 u64 offset, ns, elapsed; 2239 unsigned long flags; 2240 bool matched; 2241 bool already_matched; 2242 bool synchronizing = false; 2243 2244 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); 2245 offset = kvm_compute_tsc_offset(vcpu, data); 2246 ns = get_kvmclock_base_ns(); 2247 elapsed = ns - kvm->arch.last_tsc_nsec; 2248 2249 if (vcpu->arch.virtual_tsc_khz) { 2250 if (data == 0) { 2251 /* 2252 * detection of vcpu initialization -- need to sync 2253 * with other vCPUs. This particularly helps to keep 2254 * kvm_clock stable after CPU hotplug 2255 */ 2256 synchronizing = true; 2257 } else { 2258 u64 tsc_exp = kvm->arch.last_tsc_write + 2259 nsec_to_cycles(vcpu, elapsed); 2260 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL; 2261 /* 2262 * Special case: TSC write with a small delta (1 second) 2263 * of virtual cycle time against real time is 2264 * interpreted as an attempt to synchronize the CPU. 2265 */ 2266 synchronizing = data < tsc_exp + tsc_hz && 2267 data + tsc_hz > tsc_exp; 2268 } 2269 } 2270 2271 /* 2272 * For a reliable TSC, we can match TSC offsets, and for an unstable 2273 * TSC, we add elapsed time in this computation. We could let the 2274 * compensation code attempt to catch up if we fall behind, but 2275 * it's better to try to match offsets from the beginning. 2276 */ 2277 if (synchronizing && 2278 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) { 2279 if (!kvm_check_tsc_unstable()) { 2280 offset = kvm->arch.cur_tsc_offset; 2281 } else { 2282 u64 delta = nsec_to_cycles(vcpu, elapsed); 2283 data += delta; 2284 offset = kvm_compute_tsc_offset(vcpu, data); 2285 } 2286 matched = true; 2287 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation); 2288 } else { 2289 /* 2290 * We split periods of matched TSC writes into generations. 2291 * For each generation, we track the original measured 2292 * nanosecond time, offset, and write, so if TSCs are in 2293 * sync, we can match exact offset, and if not, we can match 2294 * exact software computation in compute_guest_tsc() 2295 * 2296 * These values are tracked in kvm->arch.cur_xxx variables. 2297 */ 2298 kvm->arch.cur_tsc_generation++; 2299 kvm->arch.cur_tsc_nsec = ns; 2300 kvm->arch.cur_tsc_write = data; 2301 kvm->arch.cur_tsc_offset = offset; 2302 matched = false; 2303 } 2304 2305 /* 2306 * We also track th most recent recorded KHZ, write and time to 2307 * allow the matching interval to be extended at each write. 2308 */ 2309 kvm->arch.last_tsc_nsec = ns; 2310 kvm->arch.last_tsc_write = data; 2311 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz; 2312 2313 vcpu->arch.last_guest_tsc = data; 2314 2315 /* Keep track of which generation this VCPU has synchronized to */ 2316 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation; 2317 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec; 2318 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write; 2319 2320 kvm_vcpu_write_tsc_offset(vcpu, offset); 2321 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); 2322 2323 spin_lock(&kvm->arch.pvclock_gtod_sync_lock); 2324 if (!matched) { 2325 kvm->arch.nr_vcpus_matched_tsc = 0; 2326 } else if (!already_matched) { 2327 kvm->arch.nr_vcpus_matched_tsc++; 2328 } 2329 2330 kvm_track_tsc_matching(vcpu); 2331 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock); 2332 } 2333 2334 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, 2335 s64 adjustment) 2336 { 2337 u64 tsc_offset = vcpu->arch.l1_tsc_offset; 2338 kvm_vcpu_write_tsc_offset(vcpu, tsc_offset + adjustment); 2339 } 2340 2341 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment) 2342 { 2343 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio) 2344 WARN_ON(adjustment < 0); 2345 adjustment = kvm_scale_tsc(vcpu, (u64) adjustment); 2346 adjust_tsc_offset_guest(vcpu, adjustment); 2347 } 2348 2349 #ifdef CONFIG_X86_64 2350 2351 static u64 read_tsc(void) 2352 { 2353 u64 ret = (u64)rdtsc_ordered(); 2354 u64 last = pvclock_gtod_data.clock.cycle_last; 2355 2356 if (likely(ret >= last)) 2357 return ret; 2358 2359 /* 2360 * GCC likes to generate cmov here, but this branch is extremely 2361 * predictable (it's just a function of time and the likely is 2362 * very likely) and there's a data dependence, so force GCC 2363 * to generate a branch instead. I don't barrier() because 2364 * we don't actually need a barrier, and if this function 2365 * ever gets inlined it will generate worse code. 2366 */ 2367 asm volatile (""); 2368 return last; 2369 } 2370 2371 static inline u64 vgettsc(struct pvclock_clock *clock, u64 *tsc_timestamp, 2372 int *mode) 2373 { 2374 long v; 2375 u64 tsc_pg_val; 2376 2377 switch (clock->vclock_mode) { 2378 case VDSO_CLOCKMODE_HVCLOCK: 2379 tsc_pg_val = hv_read_tsc_page_tsc(hv_get_tsc_page(), 2380 tsc_timestamp); 2381 if (tsc_pg_val != U64_MAX) { 2382 /* TSC page valid */ 2383 *mode = VDSO_CLOCKMODE_HVCLOCK; 2384 v = (tsc_pg_val - clock->cycle_last) & 2385 clock->mask; 2386 } else { 2387 /* TSC page invalid */ 2388 *mode = VDSO_CLOCKMODE_NONE; 2389 } 2390 break; 2391 case VDSO_CLOCKMODE_TSC: 2392 *mode = VDSO_CLOCKMODE_TSC; 2393 *tsc_timestamp = read_tsc(); 2394 v = (*tsc_timestamp - clock->cycle_last) & 2395 clock->mask; 2396 break; 2397 default: 2398 *mode = VDSO_CLOCKMODE_NONE; 2399 } 2400 2401 if (*mode == VDSO_CLOCKMODE_NONE) 2402 *tsc_timestamp = v = 0; 2403 2404 return v * clock->mult; 2405 } 2406 2407 static int do_monotonic_raw(s64 *t, u64 *tsc_timestamp) 2408 { 2409 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2410 unsigned long seq; 2411 int mode; 2412 u64 ns; 2413 2414 do { 2415 seq = read_seqcount_begin(>od->seq); 2416 ns = gtod->raw_clock.base_cycles; 2417 ns += vgettsc(>od->raw_clock, tsc_timestamp, &mode); 2418 ns >>= gtod->raw_clock.shift; 2419 ns += ktime_to_ns(ktime_add(gtod->raw_clock.offset, gtod->offs_boot)); 2420 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 2421 *t = ns; 2422 2423 return mode; 2424 } 2425 2426 static int do_realtime(struct timespec64 *ts, u64 *tsc_timestamp) 2427 { 2428 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2429 unsigned long seq; 2430 int mode; 2431 u64 ns; 2432 2433 do { 2434 seq = read_seqcount_begin(>od->seq); 2435 ts->tv_sec = gtod->wall_time_sec; 2436 ns = gtod->clock.base_cycles; 2437 ns += vgettsc(>od->clock, tsc_timestamp, &mode); 2438 ns >>= gtod->clock.shift; 2439 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 2440 2441 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns); 2442 ts->tv_nsec = ns; 2443 2444 return mode; 2445 } 2446 2447 /* returns true if host is using TSC based clocksource */ 2448 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp) 2449 { 2450 /* checked again under seqlock below */ 2451 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 2452 return false; 2453 2454 return gtod_is_based_on_tsc(do_monotonic_raw(kernel_ns, 2455 tsc_timestamp)); 2456 } 2457 2458 /* returns true if host is using TSC based clocksource */ 2459 static bool kvm_get_walltime_and_clockread(struct timespec64 *ts, 2460 u64 *tsc_timestamp) 2461 { 2462 /* checked again under seqlock below */ 2463 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 2464 return false; 2465 2466 return gtod_is_based_on_tsc(do_realtime(ts, tsc_timestamp)); 2467 } 2468 #endif 2469 2470 /* 2471 * 2472 * Assuming a stable TSC across physical CPUS, and a stable TSC 2473 * across virtual CPUs, the following condition is possible. 2474 * Each numbered line represents an event visible to both 2475 * CPUs at the next numbered event. 2476 * 2477 * "timespecX" represents host monotonic time. "tscX" represents 2478 * RDTSC value. 2479 * 2480 * VCPU0 on CPU0 | VCPU1 on CPU1 2481 * 2482 * 1. read timespec0,tsc0 2483 * 2. | timespec1 = timespec0 + N 2484 * | tsc1 = tsc0 + M 2485 * 3. transition to guest | transition to guest 2486 * 4. ret0 = timespec0 + (rdtsc - tsc0) | 2487 * 5. | ret1 = timespec1 + (rdtsc - tsc1) 2488 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M)) 2489 * 2490 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity: 2491 * 2492 * - ret0 < ret1 2493 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M)) 2494 * ... 2495 * - 0 < N - M => M < N 2496 * 2497 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not 2498 * always the case (the difference between two distinct xtime instances 2499 * might be smaller then the difference between corresponding TSC reads, 2500 * when updating guest vcpus pvclock areas). 2501 * 2502 * To avoid that problem, do not allow visibility of distinct 2503 * system_timestamp/tsc_timestamp values simultaneously: use a master 2504 * copy of host monotonic time values. Update that master copy 2505 * in lockstep. 2506 * 2507 * Rely on synchronization of host TSCs and guest TSCs for monotonicity. 2508 * 2509 */ 2510 2511 static void pvclock_update_vm_gtod_copy(struct kvm *kvm) 2512 { 2513 #ifdef CONFIG_X86_64 2514 struct kvm_arch *ka = &kvm->arch; 2515 int vclock_mode; 2516 bool host_tsc_clocksource, vcpus_matched; 2517 2518 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 2519 atomic_read(&kvm->online_vcpus)); 2520 2521 /* 2522 * If the host uses TSC clock, then passthrough TSC as stable 2523 * to the guest. 2524 */ 2525 host_tsc_clocksource = kvm_get_time_and_clockread( 2526 &ka->master_kernel_ns, 2527 &ka->master_cycle_now); 2528 2529 ka->use_master_clock = host_tsc_clocksource && vcpus_matched 2530 && !ka->backwards_tsc_observed 2531 && !ka->boot_vcpu_runs_old_kvmclock; 2532 2533 if (ka->use_master_clock) 2534 atomic_set(&kvm_guest_has_master_clock, 1); 2535 2536 vclock_mode = pvclock_gtod_data.clock.vclock_mode; 2537 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode, 2538 vcpus_matched); 2539 #endif 2540 } 2541 2542 void kvm_make_mclock_inprogress_request(struct kvm *kvm) 2543 { 2544 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); 2545 } 2546 2547 static void kvm_gen_update_masterclock(struct kvm *kvm) 2548 { 2549 #ifdef CONFIG_X86_64 2550 int i; 2551 struct kvm_vcpu *vcpu; 2552 struct kvm_arch *ka = &kvm->arch; 2553 2554 spin_lock(&ka->pvclock_gtod_sync_lock); 2555 kvm_make_mclock_inprogress_request(kvm); 2556 /* no guest entries from this point */ 2557 pvclock_update_vm_gtod_copy(kvm); 2558 2559 kvm_for_each_vcpu(i, vcpu, kvm) 2560 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2561 2562 /* guest entries allowed */ 2563 kvm_for_each_vcpu(i, vcpu, kvm) 2564 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 2565 2566 spin_unlock(&ka->pvclock_gtod_sync_lock); 2567 #endif 2568 } 2569 2570 u64 get_kvmclock_ns(struct kvm *kvm) 2571 { 2572 struct kvm_arch *ka = &kvm->arch; 2573 struct pvclock_vcpu_time_info hv_clock; 2574 u64 ret; 2575 2576 spin_lock(&ka->pvclock_gtod_sync_lock); 2577 if (!ka->use_master_clock) { 2578 spin_unlock(&ka->pvclock_gtod_sync_lock); 2579 return get_kvmclock_base_ns() + ka->kvmclock_offset; 2580 } 2581 2582 hv_clock.tsc_timestamp = ka->master_cycle_now; 2583 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; 2584 spin_unlock(&ka->pvclock_gtod_sync_lock); 2585 2586 /* both __this_cpu_read() and rdtsc() should be on the same cpu */ 2587 get_cpu(); 2588 2589 if (__this_cpu_read(cpu_tsc_khz)) { 2590 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL, 2591 &hv_clock.tsc_shift, 2592 &hv_clock.tsc_to_system_mul); 2593 ret = __pvclock_read_cycles(&hv_clock, rdtsc()); 2594 } else 2595 ret = get_kvmclock_base_ns() + ka->kvmclock_offset; 2596 2597 put_cpu(); 2598 2599 return ret; 2600 } 2601 2602 static void kvm_setup_pvclock_page(struct kvm_vcpu *v, 2603 struct gfn_to_hva_cache *cache, 2604 unsigned int offset) 2605 { 2606 struct kvm_vcpu_arch *vcpu = &v->arch; 2607 struct pvclock_vcpu_time_info guest_hv_clock; 2608 2609 if (unlikely(kvm_read_guest_offset_cached(v->kvm, cache, 2610 &guest_hv_clock, offset, sizeof(guest_hv_clock)))) 2611 return; 2612 2613 /* This VCPU is paused, but it's legal for a guest to read another 2614 * VCPU's kvmclock, so we really have to follow the specification where 2615 * it says that version is odd if data is being modified, and even after 2616 * it is consistent. 2617 * 2618 * Version field updates must be kept separate. This is because 2619 * kvm_write_guest_cached might use a "rep movs" instruction, and 2620 * writes within a string instruction are weakly ordered. So there 2621 * are three writes overall. 2622 * 2623 * As a small optimization, only write the version field in the first 2624 * and third write. The vcpu->pv_time cache is still valid, because the 2625 * version field is the first in the struct. 2626 */ 2627 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0); 2628 2629 if (guest_hv_clock.version & 1) 2630 ++guest_hv_clock.version; /* first time write, random junk */ 2631 2632 vcpu->hv_clock.version = guest_hv_clock.version + 1; 2633 kvm_write_guest_offset_cached(v->kvm, cache, 2634 &vcpu->hv_clock, offset, 2635 sizeof(vcpu->hv_clock.version)); 2636 2637 smp_wmb(); 2638 2639 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */ 2640 vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED); 2641 2642 if (vcpu->pvclock_set_guest_stopped_request) { 2643 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED; 2644 vcpu->pvclock_set_guest_stopped_request = false; 2645 } 2646 2647 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock); 2648 2649 kvm_write_guest_offset_cached(v->kvm, cache, 2650 &vcpu->hv_clock, offset, 2651 sizeof(vcpu->hv_clock)); 2652 2653 smp_wmb(); 2654 2655 vcpu->hv_clock.version++; 2656 kvm_write_guest_offset_cached(v->kvm, cache, 2657 &vcpu->hv_clock, offset, 2658 sizeof(vcpu->hv_clock.version)); 2659 } 2660 2661 static int kvm_guest_time_update(struct kvm_vcpu *v) 2662 { 2663 unsigned long flags, tgt_tsc_khz; 2664 struct kvm_vcpu_arch *vcpu = &v->arch; 2665 struct kvm_arch *ka = &v->kvm->arch; 2666 s64 kernel_ns; 2667 u64 tsc_timestamp, host_tsc; 2668 u8 pvclock_flags; 2669 bool use_master_clock; 2670 2671 kernel_ns = 0; 2672 host_tsc = 0; 2673 2674 /* 2675 * If the host uses TSC clock, then passthrough TSC as stable 2676 * to the guest. 2677 */ 2678 spin_lock(&ka->pvclock_gtod_sync_lock); 2679 use_master_clock = ka->use_master_clock; 2680 if (use_master_clock) { 2681 host_tsc = ka->master_cycle_now; 2682 kernel_ns = ka->master_kernel_ns; 2683 } 2684 spin_unlock(&ka->pvclock_gtod_sync_lock); 2685 2686 /* Keep irq disabled to prevent changes to the clock */ 2687 local_irq_save(flags); 2688 tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz); 2689 if (unlikely(tgt_tsc_khz == 0)) { 2690 local_irq_restore(flags); 2691 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2692 return 1; 2693 } 2694 if (!use_master_clock) { 2695 host_tsc = rdtsc(); 2696 kernel_ns = get_kvmclock_base_ns(); 2697 } 2698 2699 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc); 2700 2701 /* 2702 * We may have to catch up the TSC to match elapsed wall clock 2703 * time for two reasons, even if kvmclock is used. 2704 * 1) CPU could have been running below the maximum TSC rate 2705 * 2) Broken TSC compensation resets the base at each VCPU 2706 * entry to avoid unknown leaps of TSC even when running 2707 * again on the same CPU. This may cause apparent elapsed 2708 * time to disappear, and the guest to stand still or run 2709 * very slowly. 2710 */ 2711 if (vcpu->tsc_catchup) { 2712 u64 tsc = compute_guest_tsc(v, kernel_ns); 2713 if (tsc > tsc_timestamp) { 2714 adjust_tsc_offset_guest(v, tsc - tsc_timestamp); 2715 tsc_timestamp = tsc; 2716 } 2717 } 2718 2719 local_irq_restore(flags); 2720 2721 /* With all the info we got, fill in the values */ 2722 2723 if (kvm_has_tsc_control) 2724 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz); 2725 2726 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) { 2727 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL, 2728 &vcpu->hv_clock.tsc_shift, 2729 &vcpu->hv_clock.tsc_to_system_mul); 2730 vcpu->hw_tsc_khz = tgt_tsc_khz; 2731 } 2732 2733 vcpu->hv_clock.tsc_timestamp = tsc_timestamp; 2734 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; 2735 vcpu->last_guest_tsc = tsc_timestamp; 2736 2737 /* If the host uses TSC clocksource, then it is stable */ 2738 pvclock_flags = 0; 2739 if (use_master_clock) 2740 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT; 2741 2742 vcpu->hv_clock.flags = pvclock_flags; 2743 2744 if (vcpu->pv_time_enabled) 2745 kvm_setup_pvclock_page(v, &vcpu->pv_time, 0); 2746 if (vcpu->xen.vcpu_info_set) 2747 kvm_setup_pvclock_page(v, &vcpu->xen.vcpu_info_cache, 2748 offsetof(struct compat_vcpu_info, time)); 2749 if (vcpu->xen.vcpu_time_info_set) 2750 kvm_setup_pvclock_page(v, &vcpu->xen.vcpu_time_info_cache, 0); 2751 if (v == kvm_get_vcpu(v->kvm, 0)) 2752 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock); 2753 return 0; 2754 } 2755 2756 /* 2757 * kvmclock updates which are isolated to a given vcpu, such as 2758 * vcpu->cpu migration, should not allow system_timestamp from 2759 * the rest of the vcpus to remain static. Otherwise ntp frequency 2760 * correction applies to one vcpu's system_timestamp but not 2761 * the others. 2762 * 2763 * So in those cases, request a kvmclock update for all vcpus. 2764 * We need to rate-limit these requests though, as they can 2765 * considerably slow guests that have a large number of vcpus. 2766 * The time for a remote vcpu to update its kvmclock is bound 2767 * by the delay we use to rate-limit the updates. 2768 */ 2769 2770 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100) 2771 2772 static void kvmclock_update_fn(struct work_struct *work) 2773 { 2774 int i; 2775 struct delayed_work *dwork = to_delayed_work(work); 2776 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2777 kvmclock_update_work); 2778 struct kvm *kvm = container_of(ka, struct kvm, arch); 2779 struct kvm_vcpu *vcpu; 2780 2781 kvm_for_each_vcpu(i, vcpu, kvm) { 2782 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2783 kvm_vcpu_kick(vcpu); 2784 } 2785 } 2786 2787 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v) 2788 { 2789 struct kvm *kvm = v->kvm; 2790 2791 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2792 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 2793 KVMCLOCK_UPDATE_DELAY); 2794 } 2795 2796 #define KVMCLOCK_SYNC_PERIOD (300 * HZ) 2797 2798 static void kvmclock_sync_fn(struct work_struct *work) 2799 { 2800 struct delayed_work *dwork = to_delayed_work(work); 2801 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2802 kvmclock_sync_work); 2803 struct kvm *kvm = container_of(ka, struct kvm, arch); 2804 2805 if (!kvmclock_periodic_sync) 2806 return; 2807 2808 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0); 2809 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 2810 KVMCLOCK_SYNC_PERIOD); 2811 } 2812 2813 /* 2814 * On AMD, HWCR[McStatusWrEn] controls whether setting MCi_STATUS results in #GP. 2815 */ 2816 static bool can_set_mci_status(struct kvm_vcpu *vcpu) 2817 { 2818 /* McStatusWrEn enabled? */ 2819 if (guest_cpuid_is_amd_or_hygon(vcpu)) 2820 return !!(vcpu->arch.msr_hwcr & BIT_ULL(18)); 2821 2822 return false; 2823 } 2824 2825 static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2826 { 2827 u64 mcg_cap = vcpu->arch.mcg_cap; 2828 unsigned bank_num = mcg_cap & 0xff; 2829 u32 msr = msr_info->index; 2830 u64 data = msr_info->data; 2831 2832 switch (msr) { 2833 case MSR_IA32_MCG_STATUS: 2834 vcpu->arch.mcg_status = data; 2835 break; 2836 case MSR_IA32_MCG_CTL: 2837 if (!(mcg_cap & MCG_CTL_P) && 2838 (data || !msr_info->host_initiated)) 2839 return 1; 2840 if (data != 0 && data != ~(u64)0) 2841 return 1; 2842 vcpu->arch.mcg_ctl = data; 2843 break; 2844 default: 2845 if (msr >= MSR_IA32_MC0_CTL && 2846 msr < MSR_IA32_MCx_CTL(bank_num)) { 2847 u32 offset = array_index_nospec( 2848 msr - MSR_IA32_MC0_CTL, 2849 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL); 2850 2851 /* only 0 or all 1s can be written to IA32_MCi_CTL 2852 * some Linux kernels though clear bit 10 in bank 4 to 2853 * workaround a BIOS/GART TBL issue on AMD K8s, ignore 2854 * this to avoid an uncatched #GP in the guest 2855 */ 2856 if ((offset & 0x3) == 0 && 2857 data != 0 && (data | (1 << 10)) != ~(u64)0) 2858 return -1; 2859 2860 /* MCi_STATUS */ 2861 if (!msr_info->host_initiated && 2862 (offset & 0x3) == 1 && data != 0) { 2863 if (!can_set_mci_status(vcpu)) 2864 return -1; 2865 } 2866 2867 vcpu->arch.mce_banks[offset] = data; 2868 break; 2869 } 2870 return 1; 2871 } 2872 return 0; 2873 } 2874 2875 static inline bool kvm_pv_async_pf_enabled(struct kvm_vcpu *vcpu) 2876 { 2877 u64 mask = KVM_ASYNC_PF_ENABLED | KVM_ASYNC_PF_DELIVERY_AS_INT; 2878 2879 return (vcpu->arch.apf.msr_en_val & mask) == mask; 2880 } 2881 2882 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) 2883 { 2884 gpa_t gpa = data & ~0x3f; 2885 2886 /* Bits 4:5 are reserved, Should be zero */ 2887 if (data & 0x30) 2888 return 1; 2889 2890 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_VMEXIT) && 2891 (data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT)) 2892 return 1; 2893 2894 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT) && 2895 (data & KVM_ASYNC_PF_DELIVERY_AS_INT)) 2896 return 1; 2897 2898 if (!lapic_in_kernel(vcpu)) 2899 return data ? 1 : 0; 2900 2901 vcpu->arch.apf.msr_en_val = data; 2902 2903 if (!kvm_pv_async_pf_enabled(vcpu)) { 2904 kvm_clear_async_pf_completion_queue(vcpu); 2905 kvm_async_pf_hash_reset(vcpu); 2906 return 0; 2907 } 2908 2909 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa, 2910 sizeof(u64))) 2911 return 1; 2912 2913 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); 2914 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT; 2915 2916 kvm_async_pf_wakeup_all(vcpu); 2917 2918 return 0; 2919 } 2920 2921 static int kvm_pv_enable_async_pf_int(struct kvm_vcpu *vcpu, u64 data) 2922 { 2923 /* Bits 8-63 are reserved */ 2924 if (data >> 8) 2925 return 1; 2926 2927 if (!lapic_in_kernel(vcpu)) 2928 return 1; 2929 2930 vcpu->arch.apf.msr_int_val = data; 2931 2932 vcpu->arch.apf.vec = data & KVM_ASYNC_PF_VEC_MASK; 2933 2934 return 0; 2935 } 2936 2937 static void kvmclock_reset(struct kvm_vcpu *vcpu) 2938 { 2939 vcpu->arch.pv_time_enabled = false; 2940 vcpu->arch.time = 0; 2941 } 2942 2943 static void kvm_vcpu_flush_tlb_all(struct kvm_vcpu *vcpu) 2944 { 2945 ++vcpu->stat.tlb_flush; 2946 static_call(kvm_x86_tlb_flush_all)(vcpu); 2947 } 2948 2949 static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu) 2950 { 2951 ++vcpu->stat.tlb_flush; 2952 static_call(kvm_x86_tlb_flush_guest)(vcpu); 2953 } 2954 2955 static void record_steal_time(struct kvm_vcpu *vcpu) 2956 { 2957 struct kvm_host_map map; 2958 struct kvm_steal_time *st; 2959 2960 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 2961 return; 2962 2963 /* -EAGAIN is returned in atomic context so we can just return. */ 2964 if (kvm_map_gfn(vcpu, vcpu->arch.st.msr_val >> PAGE_SHIFT, 2965 &map, &vcpu->arch.st.cache, false)) 2966 return; 2967 2968 st = map.hva + 2969 offset_in_page(vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS); 2970 2971 /* 2972 * Doing a TLB flush here, on the guest's behalf, can avoid 2973 * expensive IPIs. 2974 */ 2975 if (guest_pv_has(vcpu, KVM_FEATURE_PV_TLB_FLUSH)) { 2976 trace_kvm_pv_tlb_flush(vcpu->vcpu_id, 2977 st->preempted & KVM_VCPU_FLUSH_TLB); 2978 if (xchg(&st->preempted, 0) & KVM_VCPU_FLUSH_TLB) 2979 kvm_vcpu_flush_tlb_guest(vcpu); 2980 } 2981 2982 vcpu->arch.st.preempted = 0; 2983 2984 if (st->version & 1) 2985 st->version += 1; /* first time write, random junk */ 2986 2987 st->version += 1; 2988 2989 smp_wmb(); 2990 2991 st->steal += current->sched_info.run_delay - 2992 vcpu->arch.st.last_steal; 2993 vcpu->arch.st.last_steal = current->sched_info.run_delay; 2994 2995 smp_wmb(); 2996 2997 st->version += 1; 2998 2999 kvm_unmap_gfn(vcpu, &map, &vcpu->arch.st.cache, true, false); 3000 } 3001 3002 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 3003 { 3004 bool pr = false; 3005 u32 msr = msr_info->index; 3006 u64 data = msr_info->data; 3007 3008 if (msr && msr == vcpu->kvm->arch.xen_hvm_config.msr) 3009 return kvm_xen_write_hypercall_page(vcpu, data); 3010 3011 switch (msr) { 3012 case MSR_AMD64_NB_CFG: 3013 case MSR_IA32_UCODE_WRITE: 3014 case MSR_VM_HSAVE_PA: 3015 case MSR_AMD64_PATCH_LOADER: 3016 case MSR_AMD64_BU_CFG2: 3017 case MSR_AMD64_DC_CFG: 3018 case MSR_F15H_EX_CFG: 3019 break; 3020 3021 case MSR_IA32_UCODE_REV: 3022 if (msr_info->host_initiated) 3023 vcpu->arch.microcode_version = data; 3024 break; 3025 case MSR_IA32_ARCH_CAPABILITIES: 3026 if (!msr_info->host_initiated) 3027 return 1; 3028 vcpu->arch.arch_capabilities = data; 3029 break; 3030 case MSR_IA32_PERF_CAPABILITIES: { 3031 struct kvm_msr_entry msr_ent = {.index = msr, .data = 0}; 3032 3033 if (!msr_info->host_initiated) 3034 return 1; 3035 if (guest_cpuid_has(vcpu, X86_FEATURE_PDCM) && kvm_get_msr_feature(&msr_ent)) 3036 return 1; 3037 if (data & ~msr_ent.data) 3038 return 1; 3039 3040 vcpu->arch.perf_capabilities = data; 3041 3042 return 0; 3043 } 3044 case MSR_EFER: 3045 return set_efer(vcpu, msr_info); 3046 case MSR_K7_HWCR: 3047 data &= ~(u64)0x40; /* ignore flush filter disable */ 3048 data &= ~(u64)0x100; /* ignore ignne emulation enable */ 3049 data &= ~(u64)0x8; /* ignore TLB cache disable */ 3050 3051 /* Handle McStatusWrEn */ 3052 if (data == BIT_ULL(18)) { 3053 vcpu->arch.msr_hwcr = data; 3054 } else if (data != 0) { 3055 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", 3056 data); 3057 return 1; 3058 } 3059 break; 3060 case MSR_FAM10H_MMIO_CONF_BASE: 3061 if (data != 0) { 3062 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " 3063 "0x%llx\n", data); 3064 return 1; 3065 } 3066 break; 3067 case 0x200 ... 0x2ff: 3068 return kvm_mtrr_set_msr(vcpu, msr, data); 3069 case MSR_IA32_APICBASE: 3070 return kvm_set_apic_base(vcpu, msr_info); 3071 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff: 3072 return kvm_x2apic_msr_write(vcpu, msr, data); 3073 case MSR_IA32_TSCDEADLINE: 3074 kvm_set_lapic_tscdeadline_msr(vcpu, data); 3075 break; 3076 case MSR_IA32_TSC_ADJUST: 3077 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) { 3078 if (!msr_info->host_initiated) { 3079 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr; 3080 adjust_tsc_offset_guest(vcpu, adj); 3081 } 3082 vcpu->arch.ia32_tsc_adjust_msr = data; 3083 } 3084 break; 3085 case MSR_IA32_MISC_ENABLE: 3086 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT) && 3087 ((vcpu->arch.ia32_misc_enable_msr ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) { 3088 if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3)) 3089 return 1; 3090 vcpu->arch.ia32_misc_enable_msr = data; 3091 kvm_update_cpuid_runtime(vcpu); 3092 } else { 3093 vcpu->arch.ia32_misc_enable_msr = data; 3094 } 3095 break; 3096 case MSR_IA32_SMBASE: 3097 if (!msr_info->host_initiated) 3098 return 1; 3099 vcpu->arch.smbase = data; 3100 break; 3101 case MSR_IA32_POWER_CTL: 3102 vcpu->arch.msr_ia32_power_ctl = data; 3103 break; 3104 case MSR_IA32_TSC: 3105 if (msr_info->host_initiated) { 3106 kvm_synchronize_tsc(vcpu, data); 3107 } else { 3108 u64 adj = kvm_compute_tsc_offset(vcpu, data) - vcpu->arch.l1_tsc_offset; 3109 adjust_tsc_offset_guest(vcpu, adj); 3110 vcpu->arch.ia32_tsc_adjust_msr += adj; 3111 } 3112 break; 3113 case MSR_IA32_XSS: 3114 if (!msr_info->host_initiated && 3115 !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES)) 3116 return 1; 3117 /* 3118 * KVM supports exposing PT to the guest, but does not support 3119 * IA32_XSS[bit 8]. Guests have to use RDMSR/WRMSR rather than 3120 * XSAVES/XRSTORS to save/restore PT MSRs. 3121 */ 3122 if (data & ~supported_xss) 3123 return 1; 3124 vcpu->arch.ia32_xss = data; 3125 break; 3126 case MSR_SMI_COUNT: 3127 if (!msr_info->host_initiated) 3128 return 1; 3129 vcpu->arch.smi_count = data; 3130 break; 3131 case MSR_KVM_WALL_CLOCK_NEW: 3132 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2)) 3133 return 1; 3134 3135 vcpu->kvm->arch.wall_clock = data; 3136 kvm_write_wall_clock(vcpu->kvm, data, 0); 3137 break; 3138 case MSR_KVM_WALL_CLOCK: 3139 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE)) 3140 return 1; 3141 3142 vcpu->kvm->arch.wall_clock = data; 3143 kvm_write_wall_clock(vcpu->kvm, data, 0); 3144 break; 3145 case MSR_KVM_SYSTEM_TIME_NEW: 3146 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2)) 3147 return 1; 3148 3149 kvm_write_system_time(vcpu, data, false, msr_info->host_initiated); 3150 break; 3151 case MSR_KVM_SYSTEM_TIME: 3152 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE)) 3153 return 1; 3154 3155 kvm_write_system_time(vcpu, data, true, msr_info->host_initiated); 3156 break; 3157 case MSR_KVM_ASYNC_PF_EN: 3158 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF)) 3159 return 1; 3160 3161 if (kvm_pv_enable_async_pf(vcpu, data)) 3162 return 1; 3163 break; 3164 case MSR_KVM_ASYNC_PF_INT: 3165 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT)) 3166 return 1; 3167 3168 if (kvm_pv_enable_async_pf_int(vcpu, data)) 3169 return 1; 3170 break; 3171 case MSR_KVM_ASYNC_PF_ACK: 3172 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF)) 3173 return 1; 3174 if (data & 0x1) { 3175 vcpu->arch.apf.pageready_pending = false; 3176 kvm_check_async_pf_completion(vcpu); 3177 } 3178 break; 3179 case MSR_KVM_STEAL_TIME: 3180 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME)) 3181 return 1; 3182 3183 if (unlikely(!sched_info_on())) 3184 return 1; 3185 3186 if (data & KVM_STEAL_RESERVED_MASK) 3187 return 1; 3188 3189 vcpu->arch.st.msr_val = data; 3190 3191 if (!(data & KVM_MSR_ENABLED)) 3192 break; 3193 3194 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 3195 3196 break; 3197 case MSR_KVM_PV_EOI_EN: 3198 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI)) 3199 return 1; 3200 3201 if (kvm_lapic_enable_pv_eoi(vcpu, data, sizeof(u8))) 3202 return 1; 3203 break; 3204 3205 case MSR_KVM_POLL_CONTROL: 3206 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL)) 3207 return 1; 3208 3209 /* only enable bit supported */ 3210 if (data & (-1ULL << 1)) 3211 return 1; 3212 3213 vcpu->arch.msr_kvm_poll_control = data; 3214 break; 3215 3216 case MSR_IA32_MCG_CTL: 3217 case MSR_IA32_MCG_STATUS: 3218 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 3219 return set_msr_mce(vcpu, msr_info); 3220 3221 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 3222 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 3223 pr = true; 3224 fallthrough; 3225 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 3226 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 3227 if (kvm_pmu_is_valid_msr(vcpu, msr)) 3228 return kvm_pmu_set_msr(vcpu, msr_info); 3229 3230 if (pr || data != 0) 3231 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: " 3232 "0x%x data 0x%llx\n", msr, data); 3233 break; 3234 case MSR_K7_CLK_CTL: 3235 /* 3236 * Ignore all writes to this no longer documented MSR. 3237 * Writes are only relevant for old K7 processors, 3238 * all pre-dating SVM, but a recommended workaround from 3239 * AMD for these chips. It is possible to specify the 3240 * affected processor models on the command line, hence 3241 * the need to ignore the workaround. 3242 */ 3243 break; 3244 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 3245 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 3246 case HV_X64_MSR_SYNDBG_OPTIONS: 3247 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 3248 case HV_X64_MSR_CRASH_CTL: 3249 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 3250 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 3251 case HV_X64_MSR_TSC_EMULATION_CONTROL: 3252 case HV_X64_MSR_TSC_EMULATION_STATUS: 3253 return kvm_hv_set_msr_common(vcpu, msr, data, 3254 msr_info->host_initiated); 3255 case MSR_IA32_BBL_CR_CTL3: 3256 /* Drop writes to this legacy MSR -- see rdmsr 3257 * counterpart for further detail. 3258 */ 3259 if (report_ignored_msrs) 3260 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", 3261 msr, data); 3262 break; 3263 case MSR_AMD64_OSVW_ID_LENGTH: 3264 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3265 return 1; 3266 vcpu->arch.osvw.length = data; 3267 break; 3268 case MSR_AMD64_OSVW_STATUS: 3269 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3270 return 1; 3271 vcpu->arch.osvw.status = data; 3272 break; 3273 case MSR_PLATFORM_INFO: 3274 if (!msr_info->host_initiated || 3275 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) && 3276 cpuid_fault_enabled(vcpu))) 3277 return 1; 3278 vcpu->arch.msr_platform_info = data; 3279 break; 3280 case MSR_MISC_FEATURES_ENABLES: 3281 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT || 3282 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT && 3283 !supports_cpuid_fault(vcpu))) 3284 return 1; 3285 vcpu->arch.msr_misc_features_enables = data; 3286 break; 3287 default: 3288 if (kvm_pmu_is_valid_msr(vcpu, msr)) 3289 return kvm_pmu_set_msr(vcpu, msr_info); 3290 return KVM_MSR_RET_INVALID; 3291 } 3292 return 0; 3293 } 3294 EXPORT_SYMBOL_GPL(kvm_set_msr_common); 3295 3296 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) 3297 { 3298 u64 data; 3299 u64 mcg_cap = vcpu->arch.mcg_cap; 3300 unsigned bank_num = mcg_cap & 0xff; 3301 3302 switch (msr) { 3303 case MSR_IA32_P5_MC_ADDR: 3304 case MSR_IA32_P5_MC_TYPE: 3305 data = 0; 3306 break; 3307 case MSR_IA32_MCG_CAP: 3308 data = vcpu->arch.mcg_cap; 3309 break; 3310 case MSR_IA32_MCG_CTL: 3311 if (!(mcg_cap & MCG_CTL_P) && !host) 3312 return 1; 3313 data = vcpu->arch.mcg_ctl; 3314 break; 3315 case MSR_IA32_MCG_STATUS: 3316 data = vcpu->arch.mcg_status; 3317 break; 3318 default: 3319 if (msr >= MSR_IA32_MC0_CTL && 3320 msr < MSR_IA32_MCx_CTL(bank_num)) { 3321 u32 offset = array_index_nospec( 3322 msr - MSR_IA32_MC0_CTL, 3323 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL); 3324 3325 data = vcpu->arch.mce_banks[offset]; 3326 break; 3327 } 3328 return 1; 3329 } 3330 *pdata = data; 3331 return 0; 3332 } 3333 3334 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 3335 { 3336 switch (msr_info->index) { 3337 case MSR_IA32_PLATFORM_ID: 3338 case MSR_IA32_EBL_CR_POWERON: 3339 case MSR_IA32_LASTBRANCHFROMIP: 3340 case MSR_IA32_LASTBRANCHTOIP: 3341 case MSR_IA32_LASTINTFROMIP: 3342 case MSR_IA32_LASTINTTOIP: 3343 case MSR_K8_SYSCFG: 3344 case MSR_K8_TSEG_ADDR: 3345 case MSR_K8_TSEG_MASK: 3346 case MSR_VM_HSAVE_PA: 3347 case MSR_K8_INT_PENDING_MSG: 3348 case MSR_AMD64_NB_CFG: 3349 case MSR_FAM10H_MMIO_CONF_BASE: 3350 case MSR_AMD64_BU_CFG2: 3351 case MSR_IA32_PERF_CTL: 3352 case MSR_AMD64_DC_CFG: 3353 case MSR_F15H_EX_CFG: 3354 /* 3355 * Intel Sandy Bridge CPUs must support the RAPL (running average power 3356 * limit) MSRs. Just return 0, as we do not want to expose the host 3357 * data here. Do not conditionalize this on CPUID, as KVM does not do 3358 * so for existing CPU-specific MSRs. 3359 */ 3360 case MSR_RAPL_POWER_UNIT: 3361 case MSR_PP0_ENERGY_STATUS: /* Power plane 0 (core) */ 3362 case MSR_PP1_ENERGY_STATUS: /* Power plane 1 (graphics uncore) */ 3363 case MSR_PKG_ENERGY_STATUS: /* Total package */ 3364 case MSR_DRAM_ENERGY_STATUS: /* DRAM controller */ 3365 msr_info->data = 0; 3366 break; 3367 case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5: 3368 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 3369 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 3370 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 3371 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 3372 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 3373 return kvm_pmu_get_msr(vcpu, msr_info); 3374 msr_info->data = 0; 3375 break; 3376 case MSR_IA32_UCODE_REV: 3377 msr_info->data = vcpu->arch.microcode_version; 3378 break; 3379 case MSR_IA32_ARCH_CAPABILITIES: 3380 if (!msr_info->host_initiated && 3381 !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES)) 3382 return 1; 3383 msr_info->data = vcpu->arch.arch_capabilities; 3384 break; 3385 case MSR_IA32_PERF_CAPABILITIES: 3386 if (!msr_info->host_initiated && 3387 !guest_cpuid_has(vcpu, X86_FEATURE_PDCM)) 3388 return 1; 3389 msr_info->data = vcpu->arch.perf_capabilities; 3390 break; 3391 case MSR_IA32_POWER_CTL: 3392 msr_info->data = vcpu->arch.msr_ia32_power_ctl; 3393 break; 3394 case MSR_IA32_TSC: { 3395 /* 3396 * Intel SDM states that MSR_IA32_TSC read adds the TSC offset 3397 * even when not intercepted. AMD manual doesn't explicitly 3398 * state this but appears to behave the same. 3399 * 3400 * On userspace reads and writes, however, we unconditionally 3401 * return L1's TSC value to ensure backwards-compatible 3402 * behavior for migration. 3403 */ 3404 u64 tsc_offset = msr_info->host_initiated ? vcpu->arch.l1_tsc_offset : 3405 vcpu->arch.tsc_offset; 3406 3407 msr_info->data = kvm_scale_tsc(vcpu, rdtsc()) + tsc_offset; 3408 break; 3409 } 3410 case MSR_MTRRcap: 3411 case 0x200 ... 0x2ff: 3412 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data); 3413 case 0xcd: /* fsb frequency */ 3414 msr_info->data = 3; 3415 break; 3416 /* 3417 * MSR_EBC_FREQUENCY_ID 3418 * Conservative value valid for even the basic CPU models. 3419 * Models 0,1: 000 in bits 23:21 indicating a bus speed of 3420 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, 3421 * and 266MHz for model 3, or 4. Set Core Clock 3422 * Frequency to System Bus Frequency Ratio to 1 (bits 3423 * 31:24) even though these are only valid for CPU 3424 * models > 2, however guests may end up dividing or 3425 * multiplying by zero otherwise. 3426 */ 3427 case MSR_EBC_FREQUENCY_ID: 3428 msr_info->data = 1 << 24; 3429 break; 3430 case MSR_IA32_APICBASE: 3431 msr_info->data = kvm_get_apic_base(vcpu); 3432 break; 3433 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff: 3434 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data); 3435 case MSR_IA32_TSCDEADLINE: 3436 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu); 3437 break; 3438 case MSR_IA32_TSC_ADJUST: 3439 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr; 3440 break; 3441 case MSR_IA32_MISC_ENABLE: 3442 msr_info->data = vcpu->arch.ia32_misc_enable_msr; 3443 break; 3444 case MSR_IA32_SMBASE: 3445 if (!msr_info->host_initiated) 3446 return 1; 3447 msr_info->data = vcpu->arch.smbase; 3448 break; 3449 case MSR_SMI_COUNT: 3450 msr_info->data = vcpu->arch.smi_count; 3451 break; 3452 case MSR_IA32_PERF_STATUS: 3453 /* TSC increment by tick */ 3454 msr_info->data = 1000ULL; 3455 /* CPU multiplier */ 3456 msr_info->data |= (((uint64_t)4ULL) << 40); 3457 break; 3458 case MSR_EFER: 3459 msr_info->data = vcpu->arch.efer; 3460 break; 3461 case MSR_KVM_WALL_CLOCK: 3462 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE)) 3463 return 1; 3464 3465 msr_info->data = vcpu->kvm->arch.wall_clock; 3466 break; 3467 case MSR_KVM_WALL_CLOCK_NEW: 3468 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2)) 3469 return 1; 3470 3471 msr_info->data = vcpu->kvm->arch.wall_clock; 3472 break; 3473 case MSR_KVM_SYSTEM_TIME: 3474 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE)) 3475 return 1; 3476 3477 msr_info->data = vcpu->arch.time; 3478 break; 3479 case MSR_KVM_SYSTEM_TIME_NEW: 3480 if (!guest_pv_has(vcpu, KVM_FEATURE_CLOCKSOURCE2)) 3481 return 1; 3482 3483 msr_info->data = vcpu->arch.time; 3484 break; 3485 case MSR_KVM_ASYNC_PF_EN: 3486 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF)) 3487 return 1; 3488 3489 msr_info->data = vcpu->arch.apf.msr_en_val; 3490 break; 3491 case MSR_KVM_ASYNC_PF_INT: 3492 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT)) 3493 return 1; 3494 3495 msr_info->data = vcpu->arch.apf.msr_int_val; 3496 break; 3497 case MSR_KVM_ASYNC_PF_ACK: 3498 if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF)) 3499 return 1; 3500 3501 msr_info->data = 0; 3502 break; 3503 case MSR_KVM_STEAL_TIME: 3504 if (!guest_pv_has(vcpu, KVM_FEATURE_STEAL_TIME)) 3505 return 1; 3506 3507 msr_info->data = vcpu->arch.st.msr_val; 3508 break; 3509 case MSR_KVM_PV_EOI_EN: 3510 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_EOI)) 3511 return 1; 3512 3513 msr_info->data = vcpu->arch.pv_eoi.msr_val; 3514 break; 3515 case MSR_KVM_POLL_CONTROL: 3516 if (!guest_pv_has(vcpu, KVM_FEATURE_POLL_CONTROL)) 3517 return 1; 3518 3519 msr_info->data = vcpu->arch.msr_kvm_poll_control; 3520 break; 3521 case MSR_IA32_P5_MC_ADDR: 3522 case MSR_IA32_P5_MC_TYPE: 3523 case MSR_IA32_MCG_CAP: 3524 case MSR_IA32_MCG_CTL: 3525 case MSR_IA32_MCG_STATUS: 3526 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 3527 return get_msr_mce(vcpu, msr_info->index, &msr_info->data, 3528 msr_info->host_initiated); 3529 case MSR_IA32_XSS: 3530 if (!msr_info->host_initiated && 3531 !guest_cpuid_has(vcpu, X86_FEATURE_XSAVES)) 3532 return 1; 3533 msr_info->data = vcpu->arch.ia32_xss; 3534 break; 3535 case MSR_K7_CLK_CTL: 3536 /* 3537 * Provide expected ramp-up count for K7. All other 3538 * are set to zero, indicating minimum divisors for 3539 * every field. 3540 * 3541 * This prevents guest kernels on AMD host with CPU 3542 * type 6, model 8 and higher from exploding due to 3543 * the rdmsr failing. 3544 */ 3545 msr_info->data = 0x20000000; 3546 break; 3547 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 3548 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 3549 case HV_X64_MSR_SYNDBG_OPTIONS: 3550 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 3551 case HV_X64_MSR_CRASH_CTL: 3552 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 3553 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 3554 case HV_X64_MSR_TSC_EMULATION_CONTROL: 3555 case HV_X64_MSR_TSC_EMULATION_STATUS: 3556 return kvm_hv_get_msr_common(vcpu, 3557 msr_info->index, &msr_info->data, 3558 msr_info->host_initiated); 3559 case MSR_IA32_BBL_CR_CTL3: 3560 /* This legacy MSR exists but isn't fully documented in current 3561 * silicon. It is however accessed by winxp in very narrow 3562 * scenarios where it sets bit #19, itself documented as 3563 * a "reserved" bit. Best effort attempt to source coherent 3564 * read data here should the balance of the register be 3565 * interpreted by the guest: 3566 * 3567 * L2 cache control register 3: 64GB range, 256KB size, 3568 * enabled, latency 0x1, configured 3569 */ 3570 msr_info->data = 0xbe702111; 3571 break; 3572 case MSR_AMD64_OSVW_ID_LENGTH: 3573 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3574 return 1; 3575 msr_info->data = vcpu->arch.osvw.length; 3576 break; 3577 case MSR_AMD64_OSVW_STATUS: 3578 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3579 return 1; 3580 msr_info->data = vcpu->arch.osvw.status; 3581 break; 3582 case MSR_PLATFORM_INFO: 3583 if (!msr_info->host_initiated && 3584 !vcpu->kvm->arch.guest_can_read_msr_platform_info) 3585 return 1; 3586 msr_info->data = vcpu->arch.msr_platform_info; 3587 break; 3588 case MSR_MISC_FEATURES_ENABLES: 3589 msr_info->data = vcpu->arch.msr_misc_features_enables; 3590 break; 3591 case MSR_K7_HWCR: 3592 msr_info->data = vcpu->arch.msr_hwcr; 3593 break; 3594 default: 3595 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 3596 return kvm_pmu_get_msr(vcpu, msr_info); 3597 return KVM_MSR_RET_INVALID; 3598 } 3599 return 0; 3600 } 3601 EXPORT_SYMBOL_GPL(kvm_get_msr_common); 3602 3603 /* 3604 * Read or write a bunch of msrs. All parameters are kernel addresses. 3605 * 3606 * @return number of msrs set successfully. 3607 */ 3608 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, 3609 struct kvm_msr_entry *entries, 3610 int (*do_msr)(struct kvm_vcpu *vcpu, 3611 unsigned index, u64 *data)) 3612 { 3613 int i; 3614 3615 for (i = 0; i < msrs->nmsrs; ++i) 3616 if (do_msr(vcpu, entries[i].index, &entries[i].data)) 3617 break; 3618 3619 return i; 3620 } 3621 3622 /* 3623 * Read or write a bunch of msrs. Parameters are user addresses. 3624 * 3625 * @return number of msrs set successfully. 3626 */ 3627 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, 3628 int (*do_msr)(struct kvm_vcpu *vcpu, 3629 unsigned index, u64 *data), 3630 int writeback) 3631 { 3632 struct kvm_msrs msrs; 3633 struct kvm_msr_entry *entries; 3634 int r, n; 3635 unsigned size; 3636 3637 r = -EFAULT; 3638 if (copy_from_user(&msrs, user_msrs, sizeof(msrs))) 3639 goto out; 3640 3641 r = -E2BIG; 3642 if (msrs.nmsrs >= MAX_IO_MSRS) 3643 goto out; 3644 3645 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; 3646 entries = memdup_user(user_msrs->entries, size); 3647 if (IS_ERR(entries)) { 3648 r = PTR_ERR(entries); 3649 goto out; 3650 } 3651 3652 r = n = __msr_io(vcpu, &msrs, entries, do_msr); 3653 if (r < 0) 3654 goto out_free; 3655 3656 r = -EFAULT; 3657 if (writeback && copy_to_user(user_msrs->entries, entries, size)) 3658 goto out_free; 3659 3660 r = n; 3661 3662 out_free: 3663 kfree(entries); 3664 out: 3665 return r; 3666 } 3667 3668 static inline bool kvm_can_mwait_in_guest(void) 3669 { 3670 return boot_cpu_has(X86_FEATURE_MWAIT) && 3671 !boot_cpu_has_bug(X86_BUG_MONITOR) && 3672 boot_cpu_has(X86_FEATURE_ARAT); 3673 } 3674 3675 static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu, 3676 struct kvm_cpuid2 __user *cpuid_arg) 3677 { 3678 struct kvm_cpuid2 cpuid; 3679 int r; 3680 3681 r = -EFAULT; 3682 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 3683 return r; 3684 3685 r = kvm_get_hv_cpuid(vcpu, &cpuid, cpuid_arg->entries); 3686 if (r) 3687 return r; 3688 3689 r = -EFAULT; 3690 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 3691 return r; 3692 3693 return 0; 3694 } 3695 3696 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 3697 { 3698 int r = 0; 3699 3700 switch (ext) { 3701 case KVM_CAP_IRQCHIP: 3702 case KVM_CAP_HLT: 3703 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: 3704 case KVM_CAP_SET_TSS_ADDR: 3705 case KVM_CAP_EXT_CPUID: 3706 case KVM_CAP_EXT_EMUL_CPUID: 3707 case KVM_CAP_CLOCKSOURCE: 3708 case KVM_CAP_PIT: 3709 case KVM_CAP_NOP_IO_DELAY: 3710 case KVM_CAP_MP_STATE: 3711 case KVM_CAP_SYNC_MMU: 3712 case KVM_CAP_USER_NMI: 3713 case KVM_CAP_REINJECT_CONTROL: 3714 case KVM_CAP_IRQ_INJECT_STATUS: 3715 case KVM_CAP_IOEVENTFD: 3716 case KVM_CAP_IOEVENTFD_NO_LENGTH: 3717 case KVM_CAP_PIT2: 3718 case KVM_CAP_PIT_STATE2: 3719 case KVM_CAP_SET_IDENTITY_MAP_ADDR: 3720 case KVM_CAP_VCPU_EVENTS: 3721 case KVM_CAP_HYPERV: 3722 case KVM_CAP_HYPERV_VAPIC: 3723 case KVM_CAP_HYPERV_SPIN: 3724 case KVM_CAP_HYPERV_SYNIC: 3725 case KVM_CAP_HYPERV_SYNIC2: 3726 case KVM_CAP_HYPERV_VP_INDEX: 3727 case KVM_CAP_HYPERV_EVENTFD: 3728 case KVM_CAP_HYPERV_TLBFLUSH: 3729 case KVM_CAP_HYPERV_SEND_IPI: 3730 case KVM_CAP_HYPERV_CPUID: 3731 case KVM_CAP_SYS_HYPERV_CPUID: 3732 case KVM_CAP_PCI_SEGMENT: 3733 case KVM_CAP_DEBUGREGS: 3734 case KVM_CAP_X86_ROBUST_SINGLESTEP: 3735 case KVM_CAP_XSAVE: 3736 case KVM_CAP_ASYNC_PF: 3737 case KVM_CAP_ASYNC_PF_INT: 3738 case KVM_CAP_GET_TSC_KHZ: 3739 case KVM_CAP_KVMCLOCK_CTRL: 3740 case KVM_CAP_READONLY_MEM: 3741 case KVM_CAP_HYPERV_TIME: 3742 case KVM_CAP_IOAPIC_POLARITY_IGNORED: 3743 case KVM_CAP_TSC_DEADLINE_TIMER: 3744 case KVM_CAP_DISABLE_QUIRKS: 3745 case KVM_CAP_SET_BOOT_CPU_ID: 3746 case KVM_CAP_SPLIT_IRQCHIP: 3747 case KVM_CAP_IMMEDIATE_EXIT: 3748 case KVM_CAP_PMU_EVENT_FILTER: 3749 case KVM_CAP_GET_MSR_FEATURES: 3750 case KVM_CAP_MSR_PLATFORM_INFO: 3751 case KVM_CAP_EXCEPTION_PAYLOAD: 3752 case KVM_CAP_SET_GUEST_DEBUG: 3753 case KVM_CAP_LAST_CPU: 3754 case KVM_CAP_X86_USER_SPACE_MSR: 3755 case KVM_CAP_X86_MSR_FILTER: 3756 case KVM_CAP_ENFORCE_PV_FEATURE_CPUID: 3757 r = 1; 3758 break; 3759 case KVM_CAP_XEN_HVM: 3760 r = KVM_XEN_HVM_CONFIG_HYPERCALL_MSR | 3761 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL | 3762 KVM_XEN_HVM_CONFIG_SHARED_INFO; 3763 break; 3764 case KVM_CAP_SYNC_REGS: 3765 r = KVM_SYNC_X86_VALID_FIELDS; 3766 break; 3767 case KVM_CAP_ADJUST_CLOCK: 3768 r = KVM_CLOCK_TSC_STABLE; 3769 break; 3770 case KVM_CAP_X86_DISABLE_EXITS: 3771 r |= KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE | 3772 KVM_X86_DISABLE_EXITS_CSTATE; 3773 if(kvm_can_mwait_in_guest()) 3774 r |= KVM_X86_DISABLE_EXITS_MWAIT; 3775 break; 3776 case KVM_CAP_X86_SMM: 3777 /* SMBASE is usually relocated above 1M on modern chipsets, 3778 * and SMM handlers might indeed rely on 4G segment limits, 3779 * so do not report SMM to be available if real mode is 3780 * emulated via vm86 mode. Still, do not go to great lengths 3781 * to avoid userspace's usage of the feature, because it is a 3782 * fringe case that is not enabled except via specific settings 3783 * of the module parameters. 3784 */ 3785 r = static_call(kvm_x86_has_emulated_msr)(kvm, MSR_IA32_SMBASE); 3786 break; 3787 case KVM_CAP_VAPIC: 3788 r = !static_call(kvm_x86_cpu_has_accelerated_tpr)(); 3789 break; 3790 case KVM_CAP_NR_VCPUS: 3791 r = KVM_SOFT_MAX_VCPUS; 3792 break; 3793 case KVM_CAP_MAX_VCPUS: 3794 r = KVM_MAX_VCPUS; 3795 break; 3796 case KVM_CAP_MAX_VCPU_ID: 3797 r = KVM_MAX_VCPU_ID; 3798 break; 3799 case KVM_CAP_PV_MMU: /* obsolete */ 3800 r = 0; 3801 break; 3802 case KVM_CAP_MCE: 3803 r = KVM_MAX_MCE_BANKS; 3804 break; 3805 case KVM_CAP_XCRS: 3806 r = boot_cpu_has(X86_FEATURE_XSAVE); 3807 break; 3808 case KVM_CAP_TSC_CONTROL: 3809 r = kvm_has_tsc_control; 3810 break; 3811 case KVM_CAP_X2APIC_API: 3812 r = KVM_X2APIC_API_VALID_FLAGS; 3813 break; 3814 case KVM_CAP_NESTED_STATE: 3815 r = kvm_x86_ops.nested_ops->get_state ? 3816 kvm_x86_ops.nested_ops->get_state(NULL, NULL, 0) : 0; 3817 break; 3818 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: 3819 r = kvm_x86_ops.enable_direct_tlbflush != NULL; 3820 break; 3821 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS: 3822 r = kvm_x86_ops.nested_ops->enable_evmcs != NULL; 3823 break; 3824 case KVM_CAP_SMALLER_MAXPHYADDR: 3825 r = (int) allow_smaller_maxphyaddr; 3826 break; 3827 case KVM_CAP_STEAL_TIME: 3828 r = sched_info_on(); 3829 break; 3830 case KVM_CAP_X86_BUS_LOCK_EXIT: 3831 if (kvm_has_bus_lock_exit) 3832 r = KVM_BUS_LOCK_DETECTION_OFF | 3833 KVM_BUS_LOCK_DETECTION_EXIT; 3834 else 3835 r = 0; 3836 break; 3837 default: 3838 break; 3839 } 3840 return r; 3841 3842 } 3843 3844 long kvm_arch_dev_ioctl(struct file *filp, 3845 unsigned int ioctl, unsigned long arg) 3846 { 3847 void __user *argp = (void __user *)arg; 3848 long r; 3849 3850 switch (ioctl) { 3851 case KVM_GET_MSR_INDEX_LIST: { 3852 struct kvm_msr_list __user *user_msr_list = argp; 3853 struct kvm_msr_list msr_list; 3854 unsigned n; 3855 3856 r = -EFAULT; 3857 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list))) 3858 goto out; 3859 n = msr_list.nmsrs; 3860 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs; 3861 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list))) 3862 goto out; 3863 r = -E2BIG; 3864 if (n < msr_list.nmsrs) 3865 goto out; 3866 r = -EFAULT; 3867 if (copy_to_user(user_msr_list->indices, &msrs_to_save, 3868 num_msrs_to_save * sizeof(u32))) 3869 goto out; 3870 if (copy_to_user(user_msr_list->indices + num_msrs_to_save, 3871 &emulated_msrs, 3872 num_emulated_msrs * sizeof(u32))) 3873 goto out; 3874 r = 0; 3875 break; 3876 } 3877 case KVM_GET_SUPPORTED_CPUID: 3878 case KVM_GET_EMULATED_CPUID: { 3879 struct kvm_cpuid2 __user *cpuid_arg = argp; 3880 struct kvm_cpuid2 cpuid; 3881 3882 r = -EFAULT; 3883 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 3884 goto out; 3885 3886 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries, 3887 ioctl); 3888 if (r) 3889 goto out; 3890 3891 r = -EFAULT; 3892 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 3893 goto out; 3894 r = 0; 3895 break; 3896 } 3897 case KVM_X86_GET_MCE_CAP_SUPPORTED: 3898 r = -EFAULT; 3899 if (copy_to_user(argp, &kvm_mce_cap_supported, 3900 sizeof(kvm_mce_cap_supported))) 3901 goto out; 3902 r = 0; 3903 break; 3904 case KVM_GET_MSR_FEATURE_INDEX_LIST: { 3905 struct kvm_msr_list __user *user_msr_list = argp; 3906 struct kvm_msr_list msr_list; 3907 unsigned int n; 3908 3909 r = -EFAULT; 3910 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list))) 3911 goto out; 3912 n = msr_list.nmsrs; 3913 msr_list.nmsrs = num_msr_based_features; 3914 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list))) 3915 goto out; 3916 r = -E2BIG; 3917 if (n < msr_list.nmsrs) 3918 goto out; 3919 r = -EFAULT; 3920 if (copy_to_user(user_msr_list->indices, &msr_based_features, 3921 num_msr_based_features * sizeof(u32))) 3922 goto out; 3923 r = 0; 3924 break; 3925 } 3926 case KVM_GET_MSRS: 3927 r = msr_io(NULL, argp, do_get_msr_feature, 1); 3928 break; 3929 case KVM_GET_SUPPORTED_HV_CPUID: 3930 r = kvm_ioctl_get_supported_hv_cpuid(NULL, argp); 3931 break; 3932 default: 3933 r = -EINVAL; 3934 break; 3935 } 3936 out: 3937 return r; 3938 } 3939 3940 static void wbinvd_ipi(void *garbage) 3941 { 3942 wbinvd(); 3943 } 3944 3945 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) 3946 { 3947 return kvm_arch_has_noncoherent_dma(vcpu->kvm); 3948 } 3949 3950 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3951 { 3952 /* Address WBINVD may be executed by guest */ 3953 if (need_emulate_wbinvd(vcpu)) { 3954 if (static_call(kvm_x86_has_wbinvd_exit)()) 3955 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 3956 else if (vcpu->cpu != -1 && vcpu->cpu != cpu) 3957 smp_call_function_single(vcpu->cpu, 3958 wbinvd_ipi, NULL, 1); 3959 } 3960 3961 static_call(kvm_x86_vcpu_load)(vcpu, cpu); 3962 3963 /* Save host pkru register if supported */ 3964 vcpu->arch.host_pkru = read_pkru(); 3965 3966 /* Apply any externally detected TSC adjustments (due to suspend) */ 3967 if (unlikely(vcpu->arch.tsc_offset_adjustment)) { 3968 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment); 3969 vcpu->arch.tsc_offset_adjustment = 0; 3970 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 3971 } 3972 3973 if (unlikely(vcpu->cpu != cpu) || kvm_check_tsc_unstable()) { 3974 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 : 3975 rdtsc() - vcpu->arch.last_host_tsc; 3976 if (tsc_delta < 0) 3977 mark_tsc_unstable("KVM discovered backwards TSC"); 3978 3979 if (kvm_check_tsc_unstable()) { 3980 u64 offset = kvm_compute_tsc_offset(vcpu, 3981 vcpu->arch.last_guest_tsc); 3982 kvm_vcpu_write_tsc_offset(vcpu, offset); 3983 vcpu->arch.tsc_catchup = 1; 3984 } 3985 3986 if (kvm_lapic_hv_timer_in_use(vcpu)) 3987 kvm_lapic_restart_hv_timer(vcpu); 3988 3989 /* 3990 * On a host with synchronized TSC, there is no need to update 3991 * kvmclock on vcpu->cpu migration 3992 */ 3993 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1) 3994 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 3995 if (vcpu->cpu != cpu) 3996 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu); 3997 vcpu->cpu = cpu; 3998 } 3999 4000 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 4001 } 4002 4003 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) 4004 { 4005 struct kvm_host_map map; 4006 struct kvm_steal_time *st; 4007 int idx; 4008 4009 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 4010 return; 4011 4012 if (vcpu->arch.st.preempted) 4013 return; 4014 4015 /* 4016 * Take the srcu lock as memslots will be accessed to check the gfn 4017 * cache generation against the memslots generation. 4018 */ 4019 idx = srcu_read_lock(&vcpu->kvm->srcu); 4020 4021 if (kvm_map_gfn(vcpu, vcpu->arch.st.msr_val >> PAGE_SHIFT, &map, 4022 &vcpu->arch.st.cache, true)) 4023 goto out; 4024 4025 st = map.hva + 4026 offset_in_page(vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS); 4027 4028 st->preempted = vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED; 4029 4030 kvm_unmap_gfn(vcpu, &map, &vcpu->arch.st.cache, true, true); 4031 4032 out: 4033 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4034 } 4035 4036 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 4037 { 4038 if (vcpu->preempted && !vcpu->arch.guest_state_protected) 4039 vcpu->arch.preempted_in_kernel = !static_call(kvm_x86_get_cpl)(vcpu); 4040 4041 kvm_steal_time_set_preempted(vcpu); 4042 static_call(kvm_x86_vcpu_put)(vcpu); 4043 vcpu->arch.last_host_tsc = rdtsc(); 4044 /* 4045 * If userspace has set any breakpoints or watchpoints, dr6 is restored 4046 * on every vmexit, but if not, we might have a stale dr6 from the 4047 * guest. do_debug expects dr6 to be cleared after it runs, do the same. 4048 */ 4049 set_debugreg(0, 6); 4050 } 4051 4052 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, 4053 struct kvm_lapic_state *s) 4054 { 4055 if (vcpu->arch.apicv_active) 4056 static_call(kvm_x86_sync_pir_to_irr)(vcpu); 4057 4058 return kvm_apic_get_state(vcpu, s); 4059 } 4060 4061 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, 4062 struct kvm_lapic_state *s) 4063 { 4064 int r; 4065 4066 r = kvm_apic_set_state(vcpu, s); 4067 if (r) 4068 return r; 4069 update_cr8_intercept(vcpu); 4070 4071 return 0; 4072 } 4073 4074 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu) 4075 { 4076 /* 4077 * We can accept userspace's request for interrupt injection 4078 * as long as we have a place to store the interrupt number. 4079 * The actual injection will happen when the CPU is able to 4080 * deliver the interrupt. 4081 */ 4082 if (kvm_cpu_has_extint(vcpu)) 4083 return false; 4084 4085 /* Acknowledging ExtINT does not happen if LINT0 is masked. */ 4086 return (!lapic_in_kernel(vcpu) || 4087 kvm_apic_accept_pic_intr(vcpu)); 4088 } 4089 4090 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu) 4091 { 4092 return kvm_arch_interrupt_allowed(vcpu) && 4093 kvm_cpu_accept_dm_intr(vcpu); 4094 } 4095 4096 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, 4097 struct kvm_interrupt *irq) 4098 { 4099 if (irq->irq >= KVM_NR_INTERRUPTS) 4100 return -EINVAL; 4101 4102 if (!irqchip_in_kernel(vcpu->kvm)) { 4103 kvm_queue_interrupt(vcpu, irq->irq, false); 4104 kvm_make_request(KVM_REQ_EVENT, vcpu); 4105 return 0; 4106 } 4107 4108 /* 4109 * With in-kernel LAPIC, we only use this to inject EXTINT, so 4110 * fail for in-kernel 8259. 4111 */ 4112 if (pic_in_kernel(vcpu->kvm)) 4113 return -ENXIO; 4114 4115 if (vcpu->arch.pending_external_vector != -1) 4116 return -EEXIST; 4117 4118 vcpu->arch.pending_external_vector = irq->irq; 4119 kvm_make_request(KVM_REQ_EVENT, vcpu); 4120 return 0; 4121 } 4122 4123 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) 4124 { 4125 kvm_inject_nmi(vcpu); 4126 4127 return 0; 4128 } 4129 4130 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu) 4131 { 4132 kvm_make_request(KVM_REQ_SMI, vcpu); 4133 4134 return 0; 4135 } 4136 4137 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, 4138 struct kvm_tpr_access_ctl *tac) 4139 { 4140 if (tac->flags) 4141 return -EINVAL; 4142 vcpu->arch.tpr_access_reporting = !!tac->enabled; 4143 return 0; 4144 } 4145 4146 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, 4147 u64 mcg_cap) 4148 { 4149 int r; 4150 unsigned bank_num = mcg_cap & 0xff, bank; 4151 4152 r = -EINVAL; 4153 if (!bank_num || bank_num > KVM_MAX_MCE_BANKS) 4154 goto out; 4155 if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000)) 4156 goto out; 4157 r = 0; 4158 vcpu->arch.mcg_cap = mcg_cap; 4159 /* Init IA32_MCG_CTL to all 1s */ 4160 if (mcg_cap & MCG_CTL_P) 4161 vcpu->arch.mcg_ctl = ~(u64)0; 4162 /* Init IA32_MCi_CTL to all 1s */ 4163 for (bank = 0; bank < bank_num; bank++) 4164 vcpu->arch.mce_banks[bank*4] = ~(u64)0; 4165 4166 static_call(kvm_x86_setup_mce)(vcpu); 4167 out: 4168 return r; 4169 } 4170 4171 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, 4172 struct kvm_x86_mce *mce) 4173 { 4174 u64 mcg_cap = vcpu->arch.mcg_cap; 4175 unsigned bank_num = mcg_cap & 0xff; 4176 u64 *banks = vcpu->arch.mce_banks; 4177 4178 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) 4179 return -EINVAL; 4180 /* 4181 * if IA32_MCG_CTL is not all 1s, the uncorrected error 4182 * reporting is disabled 4183 */ 4184 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && 4185 vcpu->arch.mcg_ctl != ~(u64)0) 4186 return 0; 4187 banks += 4 * mce->bank; 4188 /* 4189 * if IA32_MCi_CTL is not all 1s, the uncorrected error 4190 * reporting is disabled for the bank 4191 */ 4192 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) 4193 return 0; 4194 if (mce->status & MCI_STATUS_UC) { 4195 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || 4196 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { 4197 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 4198 return 0; 4199 } 4200 if (banks[1] & MCI_STATUS_VAL) 4201 mce->status |= MCI_STATUS_OVER; 4202 banks[2] = mce->addr; 4203 banks[3] = mce->misc; 4204 vcpu->arch.mcg_status = mce->mcg_status; 4205 banks[1] = mce->status; 4206 kvm_queue_exception(vcpu, MC_VECTOR); 4207 } else if (!(banks[1] & MCI_STATUS_VAL) 4208 || !(banks[1] & MCI_STATUS_UC)) { 4209 if (banks[1] & MCI_STATUS_VAL) 4210 mce->status |= MCI_STATUS_OVER; 4211 banks[2] = mce->addr; 4212 banks[3] = mce->misc; 4213 banks[1] = mce->status; 4214 } else 4215 banks[1] |= MCI_STATUS_OVER; 4216 return 0; 4217 } 4218 4219 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, 4220 struct kvm_vcpu_events *events) 4221 { 4222 process_nmi(vcpu); 4223 4224 if (kvm_check_request(KVM_REQ_SMI, vcpu)) 4225 process_smi(vcpu); 4226 4227 /* 4228 * In guest mode, payload delivery should be deferred, 4229 * so that the L1 hypervisor can intercept #PF before 4230 * CR2 is modified (or intercept #DB before DR6 is 4231 * modified under nVMX). Unless the per-VM capability, 4232 * KVM_CAP_EXCEPTION_PAYLOAD, is set, we may not defer the delivery of 4233 * an exception payload and handle after a KVM_GET_VCPU_EVENTS. Since we 4234 * opportunistically defer the exception payload, deliver it if the 4235 * capability hasn't been requested before processing a 4236 * KVM_GET_VCPU_EVENTS. 4237 */ 4238 if (!vcpu->kvm->arch.exception_payload_enabled && 4239 vcpu->arch.exception.pending && vcpu->arch.exception.has_payload) 4240 kvm_deliver_exception_payload(vcpu); 4241 4242 /* 4243 * The API doesn't provide the instruction length for software 4244 * exceptions, so don't report them. As long as the guest RIP 4245 * isn't advanced, we should expect to encounter the exception 4246 * again. 4247 */ 4248 if (kvm_exception_is_soft(vcpu->arch.exception.nr)) { 4249 events->exception.injected = 0; 4250 events->exception.pending = 0; 4251 } else { 4252 events->exception.injected = vcpu->arch.exception.injected; 4253 events->exception.pending = vcpu->arch.exception.pending; 4254 /* 4255 * For ABI compatibility, deliberately conflate 4256 * pending and injected exceptions when 4257 * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled. 4258 */ 4259 if (!vcpu->kvm->arch.exception_payload_enabled) 4260 events->exception.injected |= 4261 vcpu->arch.exception.pending; 4262 } 4263 events->exception.nr = vcpu->arch.exception.nr; 4264 events->exception.has_error_code = vcpu->arch.exception.has_error_code; 4265 events->exception.error_code = vcpu->arch.exception.error_code; 4266 events->exception_has_payload = vcpu->arch.exception.has_payload; 4267 events->exception_payload = vcpu->arch.exception.payload; 4268 4269 events->interrupt.injected = 4270 vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft; 4271 events->interrupt.nr = vcpu->arch.interrupt.nr; 4272 events->interrupt.soft = 0; 4273 events->interrupt.shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu); 4274 4275 events->nmi.injected = vcpu->arch.nmi_injected; 4276 events->nmi.pending = vcpu->arch.nmi_pending != 0; 4277 events->nmi.masked = static_call(kvm_x86_get_nmi_mask)(vcpu); 4278 events->nmi.pad = 0; 4279 4280 events->sipi_vector = 0; /* never valid when reporting to user space */ 4281 4282 events->smi.smm = is_smm(vcpu); 4283 events->smi.pending = vcpu->arch.smi_pending; 4284 events->smi.smm_inside_nmi = 4285 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK); 4286 events->smi.latched_init = kvm_lapic_latched_init(vcpu); 4287 4288 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING 4289 | KVM_VCPUEVENT_VALID_SHADOW 4290 | KVM_VCPUEVENT_VALID_SMM); 4291 if (vcpu->kvm->arch.exception_payload_enabled) 4292 events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD; 4293 4294 memset(&events->reserved, 0, sizeof(events->reserved)); 4295 } 4296 4297 static void kvm_smm_changed(struct kvm_vcpu *vcpu); 4298 4299 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, 4300 struct kvm_vcpu_events *events) 4301 { 4302 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING 4303 | KVM_VCPUEVENT_VALID_SIPI_VECTOR 4304 | KVM_VCPUEVENT_VALID_SHADOW 4305 | KVM_VCPUEVENT_VALID_SMM 4306 | KVM_VCPUEVENT_VALID_PAYLOAD)) 4307 return -EINVAL; 4308 4309 if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) { 4310 if (!vcpu->kvm->arch.exception_payload_enabled) 4311 return -EINVAL; 4312 if (events->exception.pending) 4313 events->exception.injected = 0; 4314 else 4315 events->exception_has_payload = 0; 4316 } else { 4317 events->exception.pending = 0; 4318 events->exception_has_payload = 0; 4319 } 4320 4321 if ((events->exception.injected || events->exception.pending) && 4322 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR)) 4323 return -EINVAL; 4324 4325 /* INITs are latched while in SMM */ 4326 if (events->flags & KVM_VCPUEVENT_VALID_SMM && 4327 (events->smi.smm || events->smi.pending) && 4328 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) 4329 return -EINVAL; 4330 4331 process_nmi(vcpu); 4332 vcpu->arch.exception.injected = events->exception.injected; 4333 vcpu->arch.exception.pending = events->exception.pending; 4334 vcpu->arch.exception.nr = events->exception.nr; 4335 vcpu->arch.exception.has_error_code = events->exception.has_error_code; 4336 vcpu->arch.exception.error_code = events->exception.error_code; 4337 vcpu->arch.exception.has_payload = events->exception_has_payload; 4338 vcpu->arch.exception.payload = events->exception_payload; 4339 4340 vcpu->arch.interrupt.injected = events->interrupt.injected; 4341 vcpu->arch.interrupt.nr = events->interrupt.nr; 4342 vcpu->arch.interrupt.soft = events->interrupt.soft; 4343 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) 4344 static_call(kvm_x86_set_interrupt_shadow)(vcpu, 4345 events->interrupt.shadow); 4346 4347 vcpu->arch.nmi_injected = events->nmi.injected; 4348 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) 4349 vcpu->arch.nmi_pending = events->nmi.pending; 4350 static_call(kvm_x86_set_nmi_mask)(vcpu, events->nmi.masked); 4351 4352 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR && 4353 lapic_in_kernel(vcpu)) 4354 vcpu->arch.apic->sipi_vector = events->sipi_vector; 4355 4356 if (events->flags & KVM_VCPUEVENT_VALID_SMM) { 4357 if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm) { 4358 if (events->smi.smm) 4359 vcpu->arch.hflags |= HF_SMM_MASK; 4360 else 4361 vcpu->arch.hflags &= ~HF_SMM_MASK; 4362 kvm_smm_changed(vcpu); 4363 } 4364 4365 vcpu->arch.smi_pending = events->smi.pending; 4366 4367 if (events->smi.smm) { 4368 if (events->smi.smm_inside_nmi) 4369 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 4370 else 4371 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; 4372 } 4373 4374 if (lapic_in_kernel(vcpu)) { 4375 if (events->smi.latched_init) 4376 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 4377 else 4378 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 4379 } 4380 } 4381 4382 kvm_make_request(KVM_REQ_EVENT, vcpu); 4383 4384 return 0; 4385 } 4386 4387 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, 4388 struct kvm_debugregs *dbgregs) 4389 { 4390 unsigned long val; 4391 4392 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); 4393 kvm_get_dr(vcpu, 6, &val); 4394 dbgregs->dr6 = val; 4395 dbgregs->dr7 = vcpu->arch.dr7; 4396 dbgregs->flags = 0; 4397 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); 4398 } 4399 4400 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, 4401 struct kvm_debugregs *dbgregs) 4402 { 4403 if (dbgregs->flags) 4404 return -EINVAL; 4405 4406 if (!kvm_dr6_valid(dbgregs->dr6)) 4407 return -EINVAL; 4408 if (!kvm_dr7_valid(dbgregs->dr7)) 4409 return -EINVAL; 4410 4411 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); 4412 kvm_update_dr0123(vcpu); 4413 vcpu->arch.dr6 = dbgregs->dr6; 4414 vcpu->arch.dr7 = dbgregs->dr7; 4415 kvm_update_dr7(vcpu); 4416 4417 return 0; 4418 } 4419 4420 #define XSTATE_COMPACTION_ENABLED (1ULL << 63) 4421 4422 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) 4423 { 4424 struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; 4425 u64 xstate_bv = xsave->header.xfeatures; 4426 u64 valid; 4427 4428 /* 4429 * Copy legacy XSAVE area, to avoid complications with CPUID 4430 * leaves 0 and 1 in the loop below. 4431 */ 4432 memcpy(dest, xsave, XSAVE_HDR_OFFSET); 4433 4434 /* Set XSTATE_BV */ 4435 xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE; 4436 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv; 4437 4438 /* 4439 * Copy each region from the possibly compacted offset to the 4440 * non-compacted offset. 4441 */ 4442 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 4443 while (valid) { 4444 u64 xfeature_mask = valid & -valid; 4445 int xfeature_nr = fls64(xfeature_mask) - 1; 4446 void *src = get_xsave_addr(xsave, xfeature_nr); 4447 4448 if (src) { 4449 u32 size, offset, ecx, edx; 4450 cpuid_count(XSTATE_CPUID, xfeature_nr, 4451 &size, &offset, &ecx, &edx); 4452 if (xfeature_nr == XFEATURE_PKRU) 4453 memcpy(dest + offset, &vcpu->arch.pkru, 4454 sizeof(vcpu->arch.pkru)); 4455 else 4456 memcpy(dest + offset, src, size); 4457 4458 } 4459 4460 valid -= xfeature_mask; 4461 } 4462 } 4463 4464 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src) 4465 { 4466 struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; 4467 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET); 4468 u64 valid; 4469 4470 /* 4471 * Copy legacy XSAVE area, to avoid complications with CPUID 4472 * leaves 0 and 1 in the loop below. 4473 */ 4474 memcpy(xsave, src, XSAVE_HDR_OFFSET); 4475 4476 /* Set XSTATE_BV and possibly XCOMP_BV. */ 4477 xsave->header.xfeatures = xstate_bv; 4478 if (boot_cpu_has(X86_FEATURE_XSAVES)) 4479 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED; 4480 4481 /* 4482 * Copy each region from the non-compacted offset to the 4483 * possibly compacted offset. 4484 */ 4485 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 4486 while (valid) { 4487 u64 xfeature_mask = valid & -valid; 4488 int xfeature_nr = fls64(xfeature_mask) - 1; 4489 void *dest = get_xsave_addr(xsave, xfeature_nr); 4490 4491 if (dest) { 4492 u32 size, offset, ecx, edx; 4493 cpuid_count(XSTATE_CPUID, xfeature_nr, 4494 &size, &offset, &ecx, &edx); 4495 if (xfeature_nr == XFEATURE_PKRU) 4496 memcpy(&vcpu->arch.pkru, src + offset, 4497 sizeof(vcpu->arch.pkru)); 4498 else 4499 memcpy(dest, src + offset, size); 4500 } 4501 4502 valid -= xfeature_mask; 4503 } 4504 } 4505 4506 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, 4507 struct kvm_xsave *guest_xsave) 4508 { 4509 if (!vcpu->arch.guest_fpu) 4510 return; 4511 4512 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 4513 memset(guest_xsave, 0, sizeof(struct kvm_xsave)); 4514 fill_xsave((u8 *) guest_xsave->region, vcpu); 4515 } else { 4516 memcpy(guest_xsave->region, 4517 &vcpu->arch.guest_fpu->state.fxsave, 4518 sizeof(struct fxregs_state)); 4519 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = 4520 XFEATURE_MASK_FPSSE; 4521 } 4522 } 4523 4524 #define XSAVE_MXCSR_OFFSET 24 4525 4526 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, 4527 struct kvm_xsave *guest_xsave) 4528 { 4529 u64 xstate_bv; 4530 u32 mxcsr; 4531 4532 if (!vcpu->arch.guest_fpu) 4533 return 0; 4534 4535 xstate_bv = *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; 4536 mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)]; 4537 4538 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 4539 /* 4540 * Here we allow setting states that are not present in 4541 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility 4542 * with old userspace. 4543 */ 4544 if (xstate_bv & ~supported_xcr0 || mxcsr & ~mxcsr_feature_mask) 4545 return -EINVAL; 4546 load_xsave(vcpu, (u8 *)guest_xsave->region); 4547 } else { 4548 if (xstate_bv & ~XFEATURE_MASK_FPSSE || 4549 mxcsr & ~mxcsr_feature_mask) 4550 return -EINVAL; 4551 memcpy(&vcpu->arch.guest_fpu->state.fxsave, 4552 guest_xsave->region, sizeof(struct fxregs_state)); 4553 } 4554 return 0; 4555 } 4556 4557 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, 4558 struct kvm_xcrs *guest_xcrs) 4559 { 4560 if (!boot_cpu_has(X86_FEATURE_XSAVE)) { 4561 guest_xcrs->nr_xcrs = 0; 4562 return; 4563 } 4564 4565 guest_xcrs->nr_xcrs = 1; 4566 guest_xcrs->flags = 0; 4567 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK; 4568 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0; 4569 } 4570 4571 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, 4572 struct kvm_xcrs *guest_xcrs) 4573 { 4574 int i, r = 0; 4575 4576 if (!boot_cpu_has(X86_FEATURE_XSAVE)) 4577 return -EINVAL; 4578 4579 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags) 4580 return -EINVAL; 4581 4582 for (i = 0; i < guest_xcrs->nr_xcrs; i++) 4583 /* Only support XCR0 currently */ 4584 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) { 4585 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK, 4586 guest_xcrs->xcrs[i].value); 4587 break; 4588 } 4589 if (r) 4590 r = -EINVAL; 4591 return r; 4592 } 4593 4594 /* 4595 * kvm_set_guest_paused() indicates to the guest kernel that it has been 4596 * stopped by the hypervisor. This function will be called from the host only. 4597 * EINVAL is returned when the host attempts to set the flag for a guest that 4598 * does not support pv clocks. 4599 */ 4600 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) 4601 { 4602 if (!vcpu->arch.pv_time_enabled) 4603 return -EINVAL; 4604 vcpu->arch.pvclock_set_guest_stopped_request = true; 4605 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 4606 return 0; 4607 } 4608 4609 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 4610 struct kvm_enable_cap *cap) 4611 { 4612 int r; 4613 uint16_t vmcs_version; 4614 void __user *user_ptr; 4615 4616 if (cap->flags) 4617 return -EINVAL; 4618 4619 switch (cap->cap) { 4620 case KVM_CAP_HYPERV_SYNIC2: 4621 if (cap->args[0]) 4622 return -EINVAL; 4623 fallthrough; 4624 4625 case KVM_CAP_HYPERV_SYNIC: 4626 if (!irqchip_in_kernel(vcpu->kvm)) 4627 return -EINVAL; 4628 return kvm_hv_activate_synic(vcpu, cap->cap == 4629 KVM_CAP_HYPERV_SYNIC2); 4630 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS: 4631 if (!kvm_x86_ops.nested_ops->enable_evmcs) 4632 return -ENOTTY; 4633 r = kvm_x86_ops.nested_ops->enable_evmcs(vcpu, &vmcs_version); 4634 if (!r) { 4635 user_ptr = (void __user *)(uintptr_t)cap->args[0]; 4636 if (copy_to_user(user_ptr, &vmcs_version, 4637 sizeof(vmcs_version))) 4638 r = -EFAULT; 4639 } 4640 return r; 4641 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: 4642 if (!kvm_x86_ops.enable_direct_tlbflush) 4643 return -ENOTTY; 4644 4645 return static_call(kvm_x86_enable_direct_tlbflush)(vcpu); 4646 4647 case KVM_CAP_ENFORCE_PV_FEATURE_CPUID: 4648 vcpu->arch.pv_cpuid.enforce = cap->args[0]; 4649 if (vcpu->arch.pv_cpuid.enforce) 4650 kvm_update_pv_runtime(vcpu); 4651 4652 return 0; 4653 4654 default: 4655 return -EINVAL; 4656 } 4657 } 4658 4659 long kvm_arch_vcpu_ioctl(struct file *filp, 4660 unsigned int ioctl, unsigned long arg) 4661 { 4662 struct kvm_vcpu *vcpu = filp->private_data; 4663 void __user *argp = (void __user *)arg; 4664 int r; 4665 union { 4666 struct kvm_lapic_state *lapic; 4667 struct kvm_xsave *xsave; 4668 struct kvm_xcrs *xcrs; 4669 void *buffer; 4670 } u; 4671 4672 vcpu_load(vcpu); 4673 4674 u.buffer = NULL; 4675 switch (ioctl) { 4676 case KVM_GET_LAPIC: { 4677 r = -EINVAL; 4678 if (!lapic_in_kernel(vcpu)) 4679 goto out; 4680 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), 4681 GFP_KERNEL_ACCOUNT); 4682 4683 r = -ENOMEM; 4684 if (!u.lapic) 4685 goto out; 4686 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic); 4687 if (r) 4688 goto out; 4689 r = -EFAULT; 4690 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state))) 4691 goto out; 4692 r = 0; 4693 break; 4694 } 4695 case KVM_SET_LAPIC: { 4696 r = -EINVAL; 4697 if (!lapic_in_kernel(vcpu)) 4698 goto out; 4699 u.lapic = memdup_user(argp, sizeof(*u.lapic)); 4700 if (IS_ERR(u.lapic)) { 4701 r = PTR_ERR(u.lapic); 4702 goto out_nofree; 4703 } 4704 4705 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic); 4706 break; 4707 } 4708 case KVM_INTERRUPT: { 4709 struct kvm_interrupt irq; 4710 4711 r = -EFAULT; 4712 if (copy_from_user(&irq, argp, sizeof(irq))) 4713 goto out; 4714 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 4715 break; 4716 } 4717 case KVM_NMI: { 4718 r = kvm_vcpu_ioctl_nmi(vcpu); 4719 break; 4720 } 4721 case KVM_SMI: { 4722 r = kvm_vcpu_ioctl_smi(vcpu); 4723 break; 4724 } 4725 case KVM_SET_CPUID: { 4726 struct kvm_cpuid __user *cpuid_arg = argp; 4727 struct kvm_cpuid cpuid; 4728 4729 r = -EFAULT; 4730 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4731 goto out; 4732 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); 4733 break; 4734 } 4735 case KVM_SET_CPUID2: { 4736 struct kvm_cpuid2 __user *cpuid_arg = argp; 4737 struct kvm_cpuid2 cpuid; 4738 4739 r = -EFAULT; 4740 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4741 goto out; 4742 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, 4743 cpuid_arg->entries); 4744 break; 4745 } 4746 case KVM_GET_CPUID2: { 4747 struct kvm_cpuid2 __user *cpuid_arg = argp; 4748 struct kvm_cpuid2 cpuid; 4749 4750 r = -EFAULT; 4751 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4752 goto out; 4753 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, 4754 cpuid_arg->entries); 4755 if (r) 4756 goto out; 4757 r = -EFAULT; 4758 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 4759 goto out; 4760 r = 0; 4761 break; 4762 } 4763 case KVM_GET_MSRS: { 4764 int idx = srcu_read_lock(&vcpu->kvm->srcu); 4765 r = msr_io(vcpu, argp, do_get_msr, 1); 4766 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4767 break; 4768 } 4769 case KVM_SET_MSRS: { 4770 int idx = srcu_read_lock(&vcpu->kvm->srcu); 4771 r = msr_io(vcpu, argp, do_set_msr, 0); 4772 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4773 break; 4774 } 4775 case KVM_TPR_ACCESS_REPORTING: { 4776 struct kvm_tpr_access_ctl tac; 4777 4778 r = -EFAULT; 4779 if (copy_from_user(&tac, argp, sizeof(tac))) 4780 goto out; 4781 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); 4782 if (r) 4783 goto out; 4784 r = -EFAULT; 4785 if (copy_to_user(argp, &tac, sizeof(tac))) 4786 goto out; 4787 r = 0; 4788 break; 4789 }; 4790 case KVM_SET_VAPIC_ADDR: { 4791 struct kvm_vapic_addr va; 4792 int idx; 4793 4794 r = -EINVAL; 4795 if (!lapic_in_kernel(vcpu)) 4796 goto out; 4797 r = -EFAULT; 4798 if (copy_from_user(&va, argp, sizeof(va))) 4799 goto out; 4800 idx = srcu_read_lock(&vcpu->kvm->srcu); 4801 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); 4802 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4803 break; 4804 } 4805 case KVM_X86_SETUP_MCE: { 4806 u64 mcg_cap; 4807 4808 r = -EFAULT; 4809 if (copy_from_user(&mcg_cap, argp, sizeof(mcg_cap))) 4810 goto out; 4811 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); 4812 break; 4813 } 4814 case KVM_X86_SET_MCE: { 4815 struct kvm_x86_mce mce; 4816 4817 r = -EFAULT; 4818 if (copy_from_user(&mce, argp, sizeof(mce))) 4819 goto out; 4820 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); 4821 break; 4822 } 4823 case KVM_GET_VCPU_EVENTS: { 4824 struct kvm_vcpu_events events; 4825 4826 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); 4827 4828 r = -EFAULT; 4829 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) 4830 break; 4831 r = 0; 4832 break; 4833 } 4834 case KVM_SET_VCPU_EVENTS: { 4835 struct kvm_vcpu_events events; 4836 4837 r = -EFAULT; 4838 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) 4839 break; 4840 4841 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); 4842 break; 4843 } 4844 case KVM_GET_DEBUGREGS: { 4845 struct kvm_debugregs dbgregs; 4846 4847 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs); 4848 4849 r = -EFAULT; 4850 if (copy_to_user(argp, &dbgregs, 4851 sizeof(struct kvm_debugregs))) 4852 break; 4853 r = 0; 4854 break; 4855 } 4856 case KVM_SET_DEBUGREGS: { 4857 struct kvm_debugregs dbgregs; 4858 4859 r = -EFAULT; 4860 if (copy_from_user(&dbgregs, argp, 4861 sizeof(struct kvm_debugregs))) 4862 break; 4863 4864 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs); 4865 break; 4866 } 4867 case KVM_GET_XSAVE: { 4868 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL_ACCOUNT); 4869 r = -ENOMEM; 4870 if (!u.xsave) 4871 break; 4872 4873 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave); 4874 4875 r = -EFAULT; 4876 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave))) 4877 break; 4878 r = 0; 4879 break; 4880 } 4881 case KVM_SET_XSAVE: { 4882 u.xsave = memdup_user(argp, sizeof(*u.xsave)); 4883 if (IS_ERR(u.xsave)) { 4884 r = PTR_ERR(u.xsave); 4885 goto out_nofree; 4886 } 4887 4888 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave); 4889 break; 4890 } 4891 case KVM_GET_XCRS: { 4892 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL_ACCOUNT); 4893 r = -ENOMEM; 4894 if (!u.xcrs) 4895 break; 4896 4897 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs); 4898 4899 r = -EFAULT; 4900 if (copy_to_user(argp, u.xcrs, 4901 sizeof(struct kvm_xcrs))) 4902 break; 4903 r = 0; 4904 break; 4905 } 4906 case KVM_SET_XCRS: { 4907 u.xcrs = memdup_user(argp, sizeof(*u.xcrs)); 4908 if (IS_ERR(u.xcrs)) { 4909 r = PTR_ERR(u.xcrs); 4910 goto out_nofree; 4911 } 4912 4913 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs); 4914 break; 4915 } 4916 case KVM_SET_TSC_KHZ: { 4917 u32 user_tsc_khz; 4918 4919 r = -EINVAL; 4920 user_tsc_khz = (u32)arg; 4921 4922 if (kvm_has_tsc_control && 4923 user_tsc_khz >= kvm_max_guest_tsc_khz) 4924 goto out; 4925 4926 if (user_tsc_khz == 0) 4927 user_tsc_khz = tsc_khz; 4928 4929 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz)) 4930 r = 0; 4931 4932 goto out; 4933 } 4934 case KVM_GET_TSC_KHZ: { 4935 r = vcpu->arch.virtual_tsc_khz; 4936 goto out; 4937 } 4938 case KVM_KVMCLOCK_CTRL: { 4939 r = kvm_set_guest_paused(vcpu); 4940 goto out; 4941 } 4942 case KVM_ENABLE_CAP: { 4943 struct kvm_enable_cap cap; 4944 4945 r = -EFAULT; 4946 if (copy_from_user(&cap, argp, sizeof(cap))) 4947 goto out; 4948 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 4949 break; 4950 } 4951 case KVM_GET_NESTED_STATE: { 4952 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4953 u32 user_data_size; 4954 4955 r = -EINVAL; 4956 if (!kvm_x86_ops.nested_ops->get_state) 4957 break; 4958 4959 BUILD_BUG_ON(sizeof(user_data_size) != sizeof(user_kvm_nested_state->size)); 4960 r = -EFAULT; 4961 if (get_user(user_data_size, &user_kvm_nested_state->size)) 4962 break; 4963 4964 r = kvm_x86_ops.nested_ops->get_state(vcpu, user_kvm_nested_state, 4965 user_data_size); 4966 if (r < 0) 4967 break; 4968 4969 if (r > user_data_size) { 4970 if (put_user(r, &user_kvm_nested_state->size)) 4971 r = -EFAULT; 4972 else 4973 r = -E2BIG; 4974 break; 4975 } 4976 4977 r = 0; 4978 break; 4979 } 4980 case KVM_SET_NESTED_STATE: { 4981 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4982 struct kvm_nested_state kvm_state; 4983 int idx; 4984 4985 r = -EINVAL; 4986 if (!kvm_x86_ops.nested_ops->set_state) 4987 break; 4988 4989 r = -EFAULT; 4990 if (copy_from_user(&kvm_state, user_kvm_nested_state, sizeof(kvm_state))) 4991 break; 4992 4993 r = -EINVAL; 4994 if (kvm_state.size < sizeof(kvm_state)) 4995 break; 4996 4997 if (kvm_state.flags & 4998 ~(KVM_STATE_NESTED_RUN_PENDING | KVM_STATE_NESTED_GUEST_MODE 4999 | KVM_STATE_NESTED_EVMCS | KVM_STATE_NESTED_MTF_PENDING 5000 | KVM_STATE_NESTED_GIF_SET)) 5001 break; 5002 5003 /* nested_run_pending implies guest_mode. */ 5004 if ((kvm_state.flags & KVM_STATE_NESTED_RUN_PENDING) 5005 && !(kvm_state.flags & KVM_STATE_NESTED_GUEST_MODE)) 5006 break; 5007 5008 idx = srcu_read_lock(&vcpu->kvm->srcu); 5009 r = kvm_x86_ops.nested_ops->set_state(vcpu, user_kvm_nested_state, &kvm_state); 5010 srcu_read_unlock(&vcpu->kvm->srcu, idx); 5011 break; 5012 } 5013 case KVM_GET_SUPPORTED_HV_CPUID: 5014 r = kvm_ioctl_get_supported_hv_cpuid(vcpu, argp); 5015 break; 5016 case KVM_XEN_VCPU_GET_ATTR: { 5017 struct kvm_xen_vcpu_attr xva; 5018 5019 r = -EFAULT; 5020 if (copy_from_user(&xva, argp, sizeof(xva))) 5021 goto out; 5022 r = kvm_xen_vcpu_get_attr(vcpu, &xva); 5023 if (!r && copy_to_user(argp, &xva, sizeof(xva))) 5024 r = -EFAULT; 5025 break; 5026 } 5027 case KVM_XEN_VCPU_SET_ATTR: { 5028 struct kvm_xen_vcpu_attr xva; 5029 5030 r = -EFAULT; 5031 if (copy_from_user(&xva, argp, sizeof(xva))) 5032 goto out; 5033 r = kvm_xen_vcpu_set_attr(vcpu, &xva); 5034 break; 5035 } 5036 default: 5037 r = -EINVAL; 5038 } 5039 out: 5040 kfree(u.buffer); 5041 out_nofree: 5042 vcpu_put(vcpu); 5043 return r; 5044 } 5045 5046 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 5047 { 5048 return VM_FAULT_SIGBUS; 5049 } 5050 5051 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) 5052 { 5053 int ret; 5054 5055 if (addr > (unsigned int)(-3 * PAGE_SIZE)) 5056 return -EINVAL; 5057 ret = static_call(kvm_x86_set_tss_addr)(kvm, addr); 5058 return ret; 5059 } 5060 5061 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, 5062 u64 ident_addr) 5063 { 5064 return static_call(kvm_x86_set_identity_map_addr)(kvm, ident_addr); 5065 } 5066 5067 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, 5068 unsigned long kvm_nr_mmu_pages) 5069 { 5070 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) 5071 return -EINVAL; 5072 5073 mutex_lock(&kvm->slots_lock); 5074 5075 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); 5076 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; 5077 5078 mutex_unlock(&kvm->slots_lock); 5079 return 0; 5080 } 5081 5082 static unsigned long kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) 5083 { 5084 return kvm->arch.n_max_mmu_pages; 5085 } 5086 5087 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 5088 { 5089 struct kvm_pic *pic = kvm->arch.vpic; 5090 int r; 5091 5092 r = 0; 5093 switch (chip->chip_id) { 5094 case KVM_IRQCHIP_PIC_MASTER: 5095 memcpy(&chip->chip.pic, &pic->pics[0], 5096 sizeof(struct kvm_pic_state)); 5097 break; 5098 case KVM_IRQCHIP_PIC_SLAVE: 5099 memcpy(&chip->chip.pic, &pic->pics[1], 5100 sizeof(struct kvm_pic_state)); 5101 break; 5102 case KVM_IRQCHIP_IOAPIC: 5103 kvm_get_ioapic(kvm, &chip->chip.ioapic); 5104 break; 5105 default: 5106 r = -EINVAL; 5107 break; 5108 } 5109 return r; 5110 } 5111 5112 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 5113 { 5114 struct kvm_pic *pic = kvm->arch.vpic; 5115 int r; 5116 5117 r = 0; 5118 switch (chip->chip_id) { 5119 case KVM_IRQCHIP_PIC_MASTER: 5120 spin_lock(&pic->lock); 5121 memcpy(&pic->pics[0], &chip->chip.pic, 5122 sizeof(struct kvm_pic_state)); 5123 spin_unlock(&pic->lock); 5124 break; 5125 case KVM_IRQCHIP_PIC_SLAVE: 5126 spin_lock(&pic->lock); 5127 memcpy(&pic->pics[1], &chip->chip.pic, 5128 sizeof(struct kvm_pic_state)); 5129 spin_unlock(&pic->lock); 5130 break; 5131 case KVM_IRQCHIP_IOAPIC: 5132 kvm_set_ioapic(kvm, &chip->chip.ioapic); 5133 break; 5134 default: 5135 r = -EINVAL; 5136 break; 5137 } 5138 kvm_pic_update_irq(pic); 5139 return r; 5140 } 5141 5142 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) 5143 { 5144 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state; 5145 5146 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels)); 5147 5148 mutex_lock(&kps->lock); 5149 memcpy(ps, &kps->channels, sizeof(*ps)); 5150 mutex_unlock(&kps->lock); 5151 return 0; 5152 } 5153 5154 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) 5155 { 5156 int i; 5157 struct kvm_pit *pit = kvm->arch.vpit; 5158 5159 mutex_lock(&pit->pit_state.lock); 5160 memcpy(&pit->pit_state.channels, ps, sizeof(*ps)); 5161 for (i = 0; i < 3; i++) 5162 kvm_pit_load_count(pit, i, ps->channels[i].count, 0); 5163 mutex_unlock(&pit->pit_state.lock); 5164 return 0; 5165 } 5166 5167 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 5168 { 5169 mutex_lock(&kvm->arch.vpit->pit_state.lock); 5170 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, 5171 sizeof(ps->channels)); 5172 ps->flags = kvm->arch.vpit->pit_state.flags; 5173 mutex_unlock(&kvm->arch.vpit->pit_state.lock); 5174 memset(&ps->reserved, 0, sizeof(ps->reserved)); 5175 return 0; 5176 } 5177 5178 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 5179 { 5180 int start = 0; 5181 int i; 5182 u32 prev_legacy, cur_legacy; 5183 struct kvm_pit *pit = kvm->arch.vpit; 5184 5185 mutex_lock(&pit->pit_state.lock); 5186 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; 5187 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; 5188 if (!prev_legacy && cur_legacy) 5189 start = 1; 5190 memcpy(&pit->pit_state.channels, &ps->channels, 5191 sizeof(pit->pit_state.channels)); 5192 pit->pit_state.flags = ps->flags; 5193 for (i = 0; i < 3; i++) 5194 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, 5195 start && i == 0); 5196 mutex_unlock(&pit->pit_state.lock); 5197 return 0; 5198 } 5199 5200 static int kvm_vm_ioctl_reinject(struct kvm *kvm, 5201 struct kvm_reinject_control *control) 5202 { 5203 struct kvm_pit *pit = kvm->arch.vpit; 5204 5205 /* pit->pit_state.lock was overloaded to prevent userspace from getting 5206 * an inconsistent state after running multiple KVM_REINJECT_CONTROL 5207 * ioctls in parallel. Use a separate lock if that ioctl isn't rare. 5208 */ 5209 mutex_lock(&pit->pit_state.lock); 5210 kvm_pit_set_reinject(pit, control->pit_reinject); 5211 mutex_unlock(&pit->pit_state.lock); 5212 5213 return 0; 5214 } 5215 5216 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) 5217 { 5218 5219 /* 5220 * Flush all CPUs' dirty log buffers to the dirty_bitmap. Called 5221 * before reporting dirty_bitmap to userspace. KVM flushes the buffers 5222 * on all VM-Exits, thus we only need to kick running vCPUs to force a 5223 * VM-Exit. 5224 */ 5225 struct kvm_vcpu *vcpu; 5226 int i; 5227 5228 kvm_for_each_vcpu(i, vcpu, kvm) 5229 kvm_vcpu_kick(vcpu); 5230 } 5231 5232 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, 5233 bool line_status) 5234 { 5235 if (!irqchip_in_kernel(kvm)) 5236 return -ENXIO; 5237 5238 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 5239 irq_event->irq, irq_event->level, 5240 line_status); 5241 return 0; 5242 } 5243 5244 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 5245 struct kvm_enable_cap *cap) 5246 { 5247 int r; 5248 5249 if (cap->flags) 5250 return -EINVAL; 5251 5252 switch (cap->cap) { 5253 case KVM_CAP_DISABLE_QUIRKS: 5254 kvm->arch.disabled_quirks = cap->args[0]; 5255 r = 0; 5256 break; 5257 case KVM_CAP_SPLIT_IRQCHIP: { 5258 mutex_lock(&kvm->lock); 5259 r = -EINVAL; 5260 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS) 5261 goto split_irqchip_unlock; 5262 r = -EEXIST; 5263 if (irqchip_in_kernel(kvm)) 5264 goto split_irqchip_unlock; 5265 if (kvm->created_vcpus) 5266 goto split_irqchip_unlock; 5267 r = kvm_setup_empty_irq_routing(kvm); 5268 if (r) 5269 goto split_irqchip_unlock; 5270 /* Pairs with irqchip_in_kernel. */ 5271 smp_wmb(); 5272 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT; 5273 kvm->arch.nr_reserved_ioapic_pins = cap->args[0]; 5274 r = 0; 5275 split_irqchip_unlock: 5276 mutex_unlock(&kvm->lock); 5277 break; 5278 } 5279 case KVM_CAP_X2APIC_API: 5280 r = -EINVAL; 5281 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS) 5282 break; 5283 5284 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS) 5285 kvm->arch.x2apic_format = true; 5286 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 5287 kvm->arch.x2apic_broadcast_quirk_disabled = true; 5288 5289 r = 0; 5290 break; 5291 case KVM_CAP_X86_DISABLE_EXITS: 5292 r = -EINVAL; 5293 if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS) 5294 break; 5295 5296 if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) && 5297 kvm_can_mwait_in_guest()) 5298 kvm->arch.mwait_in_guest = true; 5299 if (cap->args[0] & KVM_X86_DISABLE_EXITS_HLT) 5300 kvm->arch.hlt_in_guest = true; 5301 if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE) 5302 kvm->arch.pause_in_guest = true; 5303 if (cap->args[0] & KVM_X86_DISABLE_EXITS_CSTATE) 5304 kvm->arch.cstate_in_guest = true; 5305 r = 0; 5306 break; 5307 case KVM_CAP_MSR_PLATFORM_INFO: 5308 kvm->arch.guest_can_read_msr_platform_info = cap->args[0]; 5309 r = 0; 5310 break; 5311 case KVM_CAP_EXCEPTION_PAYLOAD: 5312 kvm->arch.exception_payload_enabled = cap->args[0]; 5313 r = 0; 5314 break; 5315 case KVM_CAP_X86_USER_SPACE_MSR: 5316 kvm->arch.user_space_msr_mask = cap->args[0]; 5317 r = 0; 5318 break; 5319 case KVM_CAP_X86_BUS_LOCK_EXIT: 5320 r = -EINVAL; 5321 if (cap->args[0] & ~KVM_BUS_LOCK_DETECTION_VALID_MODE) 5322 break; 5323 5324 if ((cap->args[0] & KVM_BUS_LOCK_DETECTION_OFF) && 5325 (cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT)) 5326 break; 5327 5328 if (kvm_has_bus_lock_exit && 5329 cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT) 5330 kvm->arch.bus_lock_detection_enabled = true; 5331 r = 0; 5332 break; 5333 default: 5334 r = -EINVAL; 5335 break; 5336 } 5337 return r; 5338 } 5339 5340 static void kvm_clear_msr_filter(struct kvm *kvm) 5341 { 5342 u32 i; 5343 u32 count = kvm->arch.msr_filter.count; 5344 struct msr_bitmap_range ranges[16]; 5345 5346 mutex_lock(&kvm->lock); 5347 kvm->arch.msr_filter.count = 0; 5348 memcpy(ranges, kvm->arch.msr_filter.ranges, count * sizeof(ranges[0])); 5349 mutex_unlock(&kvm->lock); 5350 synchronize_srcu(&kvm->srcu); 5351 5352 for (i = 0; i < count; i++) 5353 kfree(ranges[i].bitmap); 5354 } 5355 5356 static int kvm_add_msr_filter(struct kvm *kvm, struct kvm_msr_filter_range *user_range) 5357 { 5358 struct msr_bitmap_range *ranges = kvm->arch.msr_filter.ranges; 5359 struct msr_bitmap_range range; 5360 unsigned long *bitmap = NULL; 5361 size_t bitmap_size; 5362 int r; 5363 5364 if (!user_range->nmsrs) 5365 return 0; 5366 5367 bitmap_size = BITS_TO_LONGS(user_range->nmsrs) * sizeof(long); 5368 if (!bitmap_size || bitmap_size > KVM_MSR_FILTER_MAX_BITMAP_SIZE) 5369 return -EINVAL; 5370 5371 bitmap = memdup_user((__user u8*)user_range->bitmap, bitmap_size); 5372 if (IS_ERR(bitmap)) 5373 return PTR_ERR(bitmap); 5374 5375 range = (struct msr_bitmap_range) { 5376 .flags = user_range->flags, 5377 .base = user_range->base, 5378 .nmsrs = user_range->nmsrs, 5379 .bitmap = bitmap, 5380 }; 5381 5382 if (range.flags & ~(KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE)) { 5383 r = -EINVAL; 5384 goto err; 5385 } 5386 5387 if (!range.flags) { 5388 r = -EINVAL; 5389 goto err; 5390 } 5391 5392 /* Everything ok, add this range identifier to our global pool */ 5393 ranges[kvm->arch.msr_filter.count] = range; 5394 /* Make sure we filled the array before we tell anyone to walk it */ 5395 smp_wmb(); 5396 kvm->arch.msr_filter.count++; 5397 5398 return 0; 5399 err: 5400 kfree(bitmap); 5401 return r; 5402 } 5403 5404 static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, void __user *argp) 5405 { 5406 struct kvm_msr_filter __user *user_msr_filter = argp; 5407 struct kvm_msr_filter filter; 5408 bool default_allow; 5409 int r = 0; 5410 bool empty = true; 5411 u32 i; 5412 5413 if (copy_from_user(&filter, user_msr_filter, sizeof(filter))) 5414 return -EFAULT; 5415 5416 for (i = 0; i < ARRAY_SIZE(filter.ranges); i++) 5417 empty &= !filter.ranges[i].nmsrs; 5418 5419 default_allow = !(filter.flags & KVM_MSR_FILTER_DEFAULT_DENY); 5420 if (empty && !default_allow) 5421 return -EINVAL; 5422 5423 kvm_clear_msr_filter(kvm); 5424 5425 kvm->arch.msr_filter.default_allow = default_allow; 5426 5427 /* 5428 * Protect from concurrent calls to this function that could trigger 5429 * a TOCTOU violation on kvm->arch.msr_filter.count. 5430 */ 5431 mutex_lock(&kvm->lock); 5432 for (i = 0; i < ARRAY_SIZE(filter.ranges); i++) { 5433 r = kvm_add_msr_filter(kvm, &filter.ranges[i]); 5434 if (r) 5435 break; 5436 } 5437 5438 kvm_make_all_cpus_request(kvm, KVM_REQ_MSR_FILTER_CHANGED); 5439 mutex_unlock(&kvm->lock); 5440 5441 return r; 5442 } 5443 5444 long kvm_arch_vm_ioctl(struct file *filp, 5445 unsigned int ioctl, unsigned long arg) 5446 { 5447 struct kvm *kvm = filp->private_data; 5448 void __user *argp = (void __user *)arg; 5449 int r = -ENOTTY; 5450 /* 5451 * This union makes it completely explicit to gcc-3.x 5452 * that these two variables' stack usage should be 5453 * combined, not added together. 5454 */ 5455 union { 5456 struct kvm_pit_state ps; 5457 struct kvm_pit_state2 ps2; 5458 struct kvm_pit_config pit_config; 5459 } u; 5460 5461 switch (ioctl) { 5462 case KVM_SET_TSS_ADDR: 5463 r = kvm_vm_ioctl_set_tss_addr(kvm, arg); 5464 break; 5465 case KVM_SET_IDENTITY_MAP_ADDR: { 5466 u64 ident_addr; 5467 5468 mutex_lock(&kvm->lock); 5469 r = -EINVAL; 5470 if (kvm->created_vcpus) 5471 goto set_identity_unlock; 5472 r = -EFAULT; 5473 if (copy_from_user(&ident_addr, argp, sizeof(ident_addr))) 5474 goto set_identity_unlock; 5475 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); 5476 set_identity_unlock: 5477 mutex_unlock(&kvm->lock); 5478 break; 5479 } 5480 case KVM_SET_NR_MMU_PAGES: 5481 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); 5482 break; 5483 case KVM_GET_NR_MMU_PAGES: 5484 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); 5485 break; 5486 case KVM_CREATE_IRQCHIP: { 5487 mutex_lock(&kvm->lock); 5488 5489 r = -EEXIST; 5490 if (irqchip_in_kernel(kvm)) 5491 goto create_irqchip_unlock; 5492 5493 r = -EINVAL; 5494 if (kvm->created_vcpus) 5495 goto create_irqchip_unlock; 5496 5497 r = kvm_pic_init(kvm); 5498 if (r) 5499 goto create_irqchip_unlock; 5500 5501 r = kvm_ioapic_init(kvm); 5502 if (r) { 5503 kvm_pic_destroy(kvm); 5504 goto create_irqchip_unlock; 5505 } 5506 5507 r = kvm_setup_default_irq_routing(kvm); 5508 if (r) { 5509 kvm_ioapic_destroy(kvm); 5510 kvm_pic_destroy(kvm); 5511 goto create_irqchip_unlock; 5512 } 5513 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */ 5514 smp_wmb(); 5515 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL; 5516 create_irqchip_unlock: 5517 mutex_unlock(&kvm->lock); 5518 break; 5519 } 5520 case KVM_CREATE_PIT: 5521 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; 5522 goto create_pit; 5523 case KVM_CREATE_PIT2: 5524 r = -EFAULT; 5525 if (copy_from_user(&u.pit_config, argp, 5526 sizeof(struct kvm_pit_config))) 5527 goto out; 5528 create_pit: 5529 mutex_lock(&kvm->lock); 5530 r = -EEXIST; 5531 if (kvm->arch.vpit) 5532 goto create_pit_unlock; 5533 r = -ENOMEM; 5534 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); 5535 if (kvm->arch.vpit) 5536 r = 0; 5537 create_pit_unlock: 5538 mutex_unlock(&kvm->lock); 5539 break; 5540 case KVM_GET_IRQCHIP: { 5541 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 5542 struct kvm_irqchip *chip; 5543 5544 chip = memdup_user(argp, sizeof(*chip)); 5545 if (IS_ERR(chip)) { 5546 r = PTR_ERR(chip); 5547 goto out; 5548 } 5549 5550 r = -ENXIO; 5551 if (!irqchip_kernel(kvm)) 5552 goto get_irqchip_out; 5553 r = kvm_vm_ioctl_get_irqchip(kvm, chip); 5554 if (r) 5555 goto get_irqchip_out; 5556 r = -EFAULT; 5557 if (copy_to_user(argp, chip, sizeof(*chip))) 5558 goto get_irqchip_out; 5559 r = 0; 5560 get_irqchip_out: 5561 kfree(chip); 5562 break; 5563 } 5564 case KVM_SET_IRQCHIP: { 5565 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 5566 struct kvm_irqchip *chip; 5567 5568 chip = memdup_user(argp, sizeof(*chip)); 5569 if (IS_ERR(chip)) { 5570 r = PTR_ERR(chip); 5571 goto out; 5572 } 5573 5574 r = -ENXIO; 5575 if (!irqchip_kernel(kvm)) 5576 goto set_irqchip_out; 5577 r = kvm_vm_ioctl_set_irqchip(kvm, chip); 5578 set_irqchip_out: 5579 kfree(chip); 5580 break; 5581 } 5582 case KVM_GET_PIT: { 5583 r = -EFAULT; 5584 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) 5585 goto out; 5586 r = -ENXIO; 5587 if (!kvm->arch.vpit) 5588 goto out; 5589 r = kvm_vm_ioctl_get_pit(kvm, &u.ps); 5590 if (r) 5591 goto out; 5592 r = -EFAULT; 5593 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) 5594 goto out; 5595 r = 0; 5596 break; 5597 } 5598 case KVM_SET_PIT: { 5599 r = -EFAULT; 5600 if (copy_from_user(&u.ps, argp, sizeof(u.ps))) 5601 goto out; 5602 mutex_lock(&kvm->lock); 5603 r = -ENXIO; 5604 if (!kvm->arch.vpit) 5605 goto set_pit_out; 5606 r = kvm_vm_ioctl_set_pit(kvm, &u.ps); 5607 set_pit_out: 5608 mutex_unlock(&kvm->lock); 5609 break; 5610 } 5611 case KVM_GET_PIT2: { 5612 r = -ENXIO; 5613 if (!kvm->arch.vpit) 5614 goto out; 5615 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); 5616 if (r) 5617 goto out; 5618 r = -EFAULT; 5619 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) 5620 goto out; 5621 r = 0; 5622 break; 5623 } 5624 case KVM_SET_PIT2: { 5625 r = -EFAULT; 5626 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) 5627 goto out; 5628 mutex_lock(&kvm->lock); 5629 r = -ENXIO; 5630 if (!kvm->arch.vpit) 5631 goto set_pit2_out; 5632 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); 5633 set_pit2_out: 5634 mutex_unlock(&kvm->lock); 5635 break; 5636 } 5637 case KVM_REINJECT_CONTROL: { 5638 struct kvm_reinject_control control; 5639 r = -EFAULT; 5640 if (copy_from_user(&control, argp, sizeof(control))) 5641 goto out; 5642 r = -ENXIO; 5643 if (!kvm->arch.vpit) 5644 goto out; 5645 r = kvm_vm_ioctl_reinject(kvm, &control); 5646 break; 5647 } 5648 case KVM_SET_BOOT_CPU_ID: 5649 r = 0; 5650 mutex_lock(&kvm->lock); 5651 if (kvm->created_vcpus) 5652 r = -EBUSY; 5653 else 5654 kvm->arch.bsp_vcpu_id = arg; 5655 mutex_unlock(&kvm->lock); 5656 break; 5657 case KVM_XEN_HVM_CONFIG: { 5658 struct kvm_xen_hvm_config xhc; 5659 r = -EFAULT; 5660 if (copy_from_user(&xhc, argp, sizeof(xhc))) 5661 goto out; 5662 r = kvm_xen_hvm_config(kvm, &xhc); 5663 break; 5664 } 5665 case KVM_XEN_HVM_GET_ATTR: { 5666 struct kvm_xen_hvm_attr xha; 5667 5668 r = -EFAULT; 5669 if (copy_from_user(&xha, argp, sizeof(xha))) 5670 goto out; 5671 r = kvm_xen_hvm_get_attr(kvm, &xha); 5672 if (!r && copy_to_user(argp, &xha, sizeof(xha))) 5673 r = -EFAULT; 5674 break; 5675 } 5676 case KVM_XEN_HVM_SET_ATTR: { 5677 struct kvm_xen_hvm_attr xha; 5678 5679 r = -EFAULT; 5680 if (copy_from_user(&xha, argp, sizeof(xha))) 5681 goto out; 5682 r = kvm_xen_hvm_set_attr(kvm, &xha); 5683 break; 5684 } 5685 case KVM_SET_CLOCK: { 5686 struct kvm_clock_data user_ns; 5687 u64 now_ns; 5688 5689 r = -EFAULT; 5690 if (copy_from_user(&user_ns, argp, sizeof(user_ns))) 5691 goto out; 5692 5693 r = -EINVAL; 5694 if (user_ns.flags) 5695 goto out; 5696 5697 r = 0; 5698 /* 5699 * TODO: userspace has to take care of races with VCPU_RUN, so 5700 * kvm_gen_update_masterclock() can be cut down to locked 5701 * pvclock_update_vm_gtod_copy(). 5702 */ 5703 kvm_gen_update_masterclock(kvm); 5704 now_ns = get_kvmclock_ns(kvm); 5705 kvm->arch.kvmclock_offset += user_ns.clock - now_ns; 5706 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE); 5707 break; 5708 } 5709 case KVM_GET_CLOCK: { 5710 struct kvm_clock_data user_ns; 5711 u64 now_ns; 5712 5713 now_ns = get_kvmclock_ns(kvm); 5714 user_ns.clock = now_ns; 5715 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0; 5716 memset(&user_ns.pad, 0, sizeof(user_ns.pad)); 5717 5718 r = -EFAULT; 5719 if (copy_to_user(argp, &user_ns, sizeof(user_ns))) 5720 goto out; 5721 r = 0; 5722 break; 5723 } 5724 case KVM_MEMORY_ENCRYPT_OP: { 5725 r = -ENOTTY; 5726 if (kvm_x86_ops.mem_enc_op) 5727 r = static_call(kvm_x86_mem_enc_op)(kvm, argp); 5728 break; 5729 } 5730 case KVM_MEMORY_ENCRYPT_REG_REGION: { 5731 struct kvm_enc_region region; 5732 5733 r = -EFAULT; 5734 if (copy_from_user(®ion, argp, sizeof(region))) 5735 goto out; 5736 5737 r = -ENOTTY; 5738 if (kvm_x86_ops.mem_enc_reg_region) 5739 r = static_call(kvm_x86_mem_enc_reg_region)(kvm, ®ion); 5740 break; 5741 } 5742 case KVM_MEMORY_ENCRYPT_UNREG_REGION: { 5743 struct kvm_enc_region region; 5744 5745 r = -EFAULT; 5746 if (copy_from_user(®ion, argp, sizeof(region))) 5747 goto out; 5748 5749 r = -ENOTTY; 5750 if (kvm_x86_ops.mem_enc_unreg_region) 5751 r = static_call(kvm_x86_mem_enc_unreg_region)(kvm, ®ion); 5752 break; 5753 } 5754 case KVM_HYPERV_EVENTFD: { 5755 struct kvm_hyperv_eventfd hvevfd; 5756 5757 r = -EFAULT; 5758 if (copy_from_user(&hvevfd, argp, sizeof(hvevfd))) 5759 goto out; 5760 r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd); 5761 break; 5762 } 5763 case KVM_SET_PMU_EVENT_FILTER: 5764 r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp); 5765 break; 5766 case KVM_X86_SET_MSR_FILTER: 5767 r = kvm_vm_ioctl_set_msr_filter(kvm, argp); 5768 break; 5769 default: 5770 r = -ENOTTY; 5771 } 5772 out: 5773 return r; 5774 } 5775 5776 static void kvm_init_msr_list(void) 5777 { 5778 struct x86_pmu_capability x86_pmu; 5779 u32 dummy[2]; 5780 unsigned i; 5781 5782 BUILD_BUG_ON_MSG(INTEL_PMC_MAX_FIXED != 4, 5783 "Please update the fixed PMCs in msrs_to_saved_all[]"); 5784 5785 perf_get_x86_pmu_capability(&x86_pmu); 5786 5787 num_msrs_to_save = 0; 5788 num_emulated_msrs = 0; 5789 num_msr_based_features = 0; 5790 5791 for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) { 5792 if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0) 5793 continue; 5794 5795 /* 5796 * Even MSRs that are valid in the host may not be exposed 5797 * to the guests in some cases. 5798 */ 5799 switch (msrs_to_save_all[i]) { 5800 case MSR_IA32_BNDCFGS: 5801 if (!kvm_mpx_supported()) 5802 continue; 5803 break; 5804 case MSR_TSC_AUX: 5805 if (!kvm_cpu_cap_has(X86_FEATURE_RDTSCP)) 5806 continue; 5807 break; 5808 case MSR_IA32_UMWAIT_CONTROL: 5809 if (!kvm_cpu_cap_has(X86_FEATURE_WAITPKG)) 5810 continue; 5811 break; 5812 case MSR_IA32_RTIT_CTL: 5813 case MSR_IA32_RTIT_STATUS: 5814 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) 5815 continue; 5816 break; 5817 case MSR_IA32_RTIT_CR3_MATCH: 5818 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 5819 !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering)) 5820 continue; 5821 break; 5822 case MSR_IA32_RTIT_OUTPUT_BASE: 5823 case MSR_IA32_RTIT_OUTPUT_MASK: 5824 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 5825 (!intel_pt_validate_hw_cap(PT_CAP_topa_output) && 5826 !intel_pt_validate_hw_cap(PT_CAP_single_range_output))) 5827 continue; 5828 break; 5829 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: 5830 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 5831 msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >= 5832 intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2) 5833 continue; 5834 break; 5835 case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR0 + 17: 5836 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_PERFCTR0 >= 5837 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 5838 continue; 5839 break; 5840 case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL0 + 17: 5841 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >= 5842 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 5843 continue; 5844 break; 5845 default: 5846 break; 5847 } 5848 5849 msrs_to_save[num_msrs_to_save++] = msrs_to_save_all[i]; 5850 } 5851 5852 for (i = 0; i < ARRAY_SIZE(emulated_msrs_all); i++) { 5853 if (!static_call(kvm_x86_has_emulated_msr)(NULL, emulated_msrs_all[i])) 5854 continue; 5855 5856 emulated_msrs[num_emulated_msrs++] = emulated_msrs_all[i]; 5857 } 5858 5859 for (i = 0; i < ARRAY_SIZE(msr_based_features_all); i++) { 5860 struct kvm_msr_entry msr; 5861 5862 msr.index = msr_based_features_all[i]; 5863 if (kvm_get_msr_feature(&msr)) 5864 continue; 5865 5866 msr_based_features[num_msr_based_features++] = msr_based_features_all[i]; 5867 } 5868 } 5869 5870 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, 5871 const void *v) 5872 { 5873 int handled = 0; 5874 int n; 5875 5876 do { 5877 n = min(len, 8); 5878 if (!(lapic_in_kernel(vcpu) && 5879 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v)) 5880 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v)) 5881 break; 5882 handled += n; 5883 addr += n; 5884 len -= n; 5885 v += n; 5886 } while (len); 5887 5888 return handled; 5889 } 5890 5891 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) 5892 { 5893 int handled = 0; 5894 int n; 5895 5896 do { 5897 n = min(len, 8); 5898 if (!(lapic_in_kernel(vcpu) && 5899 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev, 5900 addr, n, v)) 5901 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v)) 5902 break; 5903 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v); 5904 handled += n; 5905 addr += n; 5906 len -= n; 5907 v += n; 5908 } while (len); 5909 5910 return handled; 5911 } 5912 5913 static void kvm_set_segment(struct kvm_vcpu *vcpu, 5914 struct kvm_segment *var, int seg) 5915 { 5916 static_call(kvm_x86_set_segment)(vcpu, var, seg); 5917 } 5918 5919 void kvm_get_segment(struct kvm_vcpu *vcpu, 5920 struct kvm_segment *var, int seg) 5921 { 5922 static_call(kvm_x86_get_segment)(vcpu, var, seg); 5923 } 5924 5925 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access, 5926 struct x86_exception *exception) 5927 { 5928 gpa_t t_gpa; 5929 5930 BUG_ON(!mmu_is_nested(vcpu)); 5931 5932 /* NPT walks are always user-walks */ 5933 access |= PFERR_USER_MASK; 5934 t_gpa = vcpu->arch.mmu->gva_to_gpa(vcpu, gpa, access, exception); 5935 5936 return t_gpa; 5937 } 5938 5939 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, 5940 struct x86_exception *exception) 5941 { 5942 u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; 5943 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5944 } 5945 5946 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, 5947 struct x86_exception *exception) 5948 { 5949 u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; 5950 access |= PFERR_FETCH_MASK; 5951 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5952 } 5953 5954 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, 5955 struct x86_exception *exception) 5956 { 5957 u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; 5958 access |= PFERR_WRITE_MASK; 5959 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5960 } 5961 5962 /* uses this to access any guest's mapped memory without checking CPL */ 5963 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, 5964 struct x86_exception *exception) 5965 { 5966 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception); 5967 } 5968 5969 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 5970 struct kvm_vcpu *vcpu, u32 access, 5971 struct x86_exception *exception) 5972 { 5973 void *data = val; 5974 int r = X86EMUL_CONTINUE; 5975 5976 while (bytes) { 5977 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access, 5978 exception); 5979 unsigned offset = addr & (PAGE_SIZE-1); 5980 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); 5981 int ret; 5982 5983 if (gpa == UNMAPPED_GVA) 5984 return X86EMUL_PROPAGATE_FAULT; 5985 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data, 5986 offset, toread); 5987 if (ret < 0) { 5988 r = X86EMUL_IO_NEEDED; 5989 goto out; 5990 } 5991 5992 bytes -= toread; 5993 data += toread; 5994 addr += toread; 5995 } 5996 out: 5997 return r; 5998 } 5999 6000 /* used for instruction fetching */ 6001 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, 6002 gva_t addr, void *val, unsigned int bytes, 6003 struct x86_exception *exception) 6004 { 6005 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6006 u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; 6007 unsigned offset; 6008 int ret; 6009 6010 /* Inline kvm_read_guest_virt_helper for speed. */ 6011 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK, 6012 exception); 6013 if (unlikely(gpa == UNMAPPED_GVA)) 6014 return X86EMUL_PROPAGATE_FAULT; 6015 6016 offset = addr & (PAGE_SIZE-1); 6017 if (WARN_ON(offset + bytes > PAGE_SIZE)) 6018 bytes = (unsigned)PAGE_SIZE - offset; 6019 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val, 6020 offset, bytes); 6021 if (unlikely(ret < 0)) 6022 return X86EMUL_IO_NEEDED; 6023 6024 return X86EMUL_CONTINUE; 6025 } 6026 6027 int kvm_read_guest_virt(struct kvm_vcpu *vcpu, 6028 gva_t addr, void *val, unsigned int bytes, 6029 struct x86_exception *exception) 6030 { 6031 u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; 6032 6033 /* 6034 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED 6035 * is returned, but our callers are not ready for that and they blindly 6036 * call kvm_inject_page_fault. Ensure that they at least do not leak 6037 * uninitialized kernel stack memory into cr2 and error code. 6038 */ 6039 memset(exception, 0, sizeof(*exception)); 6040 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, 6041 exception); 6042 } 6043 EXPORT_SYMBOL_GPL(kvm_read_guest_virt); 6044 6045 static int emulator_read_std(struct x86_emulate_ctxt *ctxt, 6046 gva_t addr, void *val, unsigned int bytes, 6047 struct x86_exception *exception, bool system) 6048 { 6049 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6050 u32 access = 0; 6051 6052 if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3) 6053 access |= PFERR_USER_MASK; 6054 6055 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception); 6056 } 6057 6058 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, 6059 unsigned long addr, void *val, unsigned int bytes) 6060 { 6061 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6062 int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); 6063 6064 return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; 6065 } 6066 6067 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 6068 struct kvm_vcpu *vcpu, u32 access, 6069 struct x86_exception *exception) 6070 { 6071 void *data = val; 6072 int r = X86EMUL_CONTINUE; 6073 6074 while (bytes) { 6075 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, 6076 access, 6077 exception); 6078 unsigned offset = addr & (PAGE_SIZE-1); 6079 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); 6080 int ret; 6081 6082 if (gpa == UNMAPPED_GVA) 6083 return X86EMUL_PROPAGATE_FAULT; 6084 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); 6085 if (ret < 0) { 6086 r = X86EMUL_IO_NEEDED; 6087 goto out; 6088 } 6089 6090 bytes -= towrite; 6091 data += towrite; 6092 addr += towrite; 6093 } 6094 out: 6095 return r; 6096 } 6097 6098 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, 6099 unsigned int bytes, struct x86_exception *exception, 6100 bool system) 6101 { 6102 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6103 u32 access = PFERR_WRITE_MASK; 6104 6105 if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3) 6106 access |= PFERR_USER_MASK; 6107 6108 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 6109 access, exception); 6110 } 6111 6112 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val, 6113 unsigned int bytes, struct x86_exception *exception) 6114 { 6115 /* kvm_write_guest_virt_system can pull in tons of pages. */ 6116 vcpu->arch.l1tf_flush_l1d = true; 6117 6118 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 6119 PFERR_WRITE_MASK, exception); 6120 } 6121 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); 6122 6123 int handle_ud(struct kvm_vcpu *vcpu) 6124 { 6125 static const char kvm_emulate_prefix[] = { __KVM_EMULATE_PREFIX }; 6126 int emul_type = EMULTYPE_TRAP_UD; 6127 char sig[5]; /* ud2; .ascii "kvm" */ 6128 struct x86_exception e; 6129 6130 if (unlikely(!static_call(kvm_x86_can_emulate_instruction)(vcpu, NULL, 0))) 6131 return 1; 6132 6133 if (force_emulation_prefix && 6134 kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu), 6135 sig, sizeof(sig), &e) == 0 && 6136 memcmp(sig, kvm_emulate_prefix, sizeof(sig)) == 0) { 6137 kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig)); 6138 emul_type = EMULTYPE_TRAP_UD_FORCED; 6139 } 6140 6141 return kvm_emulate_instruction(vcpu, emul_type); 6142 } 6143 EXPORT_SYMBOL_GPL(handle_ud); 6144 6145 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 6146 gpa_t gpa, bool write) 6147 { 6148 /* For APIC access vmexit */ 6149 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 6150 return 1; 6151 6152 if (vcpu_match_mmio_gpa(vcpu, gpa)) { 6153 trace_vcpu_match_mmio(gva, gpa, write, true); 6154 return 1; 6155 } 6156 6157 return 0; 6158 } 6159 6160 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 6161 gpa_t *gpa, struct x86_exception *exception, 6162 bool write) 6163 { 6164 u32 access = ((static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0) 6165 | (write ? PFERR_WRITE_MASK : 0); 6166 6167 /* 6168 * currently PKRU is only applied to ept enabled guest so 6169 * there is no pkey in EPT page table for L1 guest or EPT 6170 * shadow page table for L2 guest. 6171 */ 6172 if (vcpu_match_mmio_gva(vcpu, gva) 6173 && !permission_fault(vcpu, vcpu->arch.walk_mmu, 6174 vcpu->arch.mmio_access, 0, access)) { 6175 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | 6176 (gva & (PAGE_SIZE - 1)); 6177 trace_vcpu_match_mmio(gva, *gpa, write, false); 6178 return 1; 6179 } 6180 6181 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 6182 6183 if (*gpa == UNMAPPED_GVA) 6184 return -1; 6185 6186 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write); 6187 } 6188 6189 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, 6190 const void *val, int bytes) 6191 { 6192 int ret; 6193 6194 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes); 6195 if (ret < 0) 6196 return 0; 6197 kvm_page_track_write(vcpu, gpa, val, bytes); 6198 return 1; 6199 } 6200 6201 struct read_write_emulator_ops { 6202 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val, 6203 int bytes); 6204 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa, 6205 void *val, int bytes); 6206 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 6207 int bytes, void *val); 6208 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 6209 void *val, int bytes); 6210 bool write; 6211 }; 6212 6213 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes) 6214 { 6215 if (vcpu->mmio_read_completed) { 6216 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, 6217 vcpu->mmio_fragments[0].gpa, val); 6218 vcpu->mmio_read_completed = 0; 6219 return 1; 6220 } 6221 6222 return 0; 6223 } 6224 6225 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 6226 void *val, int bytes) 6227 { 6228 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes); 6229 } 6230 6231 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 6232 void *val, int bytes) 6233 { 6234 return emulator_write_phys(vcpu, gpa, val, bytes); 6235 } 6236 6237 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val) 6238 { 6239 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val); 6240 return vcpu_mmio_write(vcpu, gpa, bytes, val); 6241 } 6242 6243 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 6244 void *val, int bytes) 6245 { 6246 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL); 6247 return X86EMUL_IO_NEEDED; 6248 } 6249 6250 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 6251 void *val, int bytes) 6252 { 6253 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0]; 6254 6255 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len)); 6256 return X86EMUL_CONTINUE; 6257 } 6258 6259 static const struct read_write_emulator_ops read_emultor = { 6260 .read_write_prepare = read_prepare, 6261 .read_write_emulate = read_emulate, 6262 .read_write_mmio = vcpu_mmio_read, 6263 .read_write_exit_mmio = read_exit_mmio, 6264 }; 6265 6266 static const struct read_write_emulator_ops write_emultor = { 6267 .read_write_emulate = write_emulate, 6268 .read_write_mmio = write_mmio, 6269 .read_write_exit_mmio = write_exit_mmio, 6270 .write = true, 6271 }; 6272 6273 static int emulator_read_write_onepage(unsigned long addr, void *val, 6274 unsigned int bytes, 6275 struct x86_exception *exception, 6276 struct kvm_vcpu *vcpu, 6277 const struct read_write_emulator_ops *ops) 6278 { 6279 gpa_t gpa; 6280 int handled, ret; 6281 bool write = ops->write; 6282 struct kvm_mmio_fragment *frag; 6283 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 6284 6285 /* 6286 * If the exit was due to a NPF we may already have a GPA. 6287 * If the GPA is present, use it to avoid the GVA to GPA table walk. 6288 * Note, this cannot be used on string operations since string 6289 * operation using rep will only have the initial GPA from the NPF 6290 * occurred. 6291 */ 6292 if (ctxt->gpa_available && emulator_can_use_gpa(ctxt) && 6293 (addr & ~PAGE_MASK) == (ctxt->gpa_val & ~PAGE_MASK)) { 6294 gpa = ctxt->gpa_val; 6295 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write); 6296 } else { 6297 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); 6298 if (ret < 0) 6299 return X86EMUL_PROPAGATE_FAULT; 6300 } 6301 6302 if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes)) 6303 return X86EMUL_CONTINUE; 6304 6305 /* 6306 * Is this MMIO handled locally? 6307 */ 6308 handled = ops->read_write_mmio(vcpu, gpa, bytes, val); 6309 if (handled == bytes) 6310 return X86EMUL_CONTINUE; 6311 6312 gpa += handled; 6313 bytes -= handled; 6314 val += handled; 6315 6316 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS); 6317 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++]; 6318 frag->gpa = gpa; 6319 frag->data = val; 6320 frag->len = bytes; 6321 return X86EMUL_CONTINUE; 6322 } 6323 6324 static int emulator_read_write(struct x86_emulate_ctxt *ctxt, 6325 unsigned long addr, 6326 void *val, unsigned int bytes, 6327 struct x86_exception *exception, 6328 const struct read_write_emulator_ops *ops) 6329 { 6330 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6331 gpa_t gpa; 6332 int rc; 6333 6334 if (ops->read_write_prepare && 6335 ops->read_write_prepare(vcpu, val, bytes)) 6336 return X86EMUL_CONTINUE; 6337 6338 vcpu->mmio_nr_fragments = 0; 6339 6340 /* Crossing a page boundary? */ 6341 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { 6342 int now; 6343 6344 now = -addr & ~PAGE_MASK; 6345 rc = emulator_read_write_onepage(addr, val, now, exception, 6346 vcpu, ops); 6347 6348 if (rc != X86EMUL_CONTINUE) 6349 return rc; 6350 addr += now; 6351 if (ctxt->mode != X86EMUL_MODE_PROT64) 6352 addr = (u32)addr; 6353 val += now; 6354 bytes -= now; 6355 } 6356 6357 rc = emulator_read_write_onepage(addr, val, bytes, exception, 6358 vcpu, ops); 6359 if (rc != X86EMUL_CONTINUE) 6360 return rc; 6361 6362 if (!vcpu->mmio_nr_fragments) 6363 return rc; 6364 6365 gpa = vcpu->mmio_fragments[0].gpa; 6366 6367 vcpu->mmio_needed = 1; 6368 vcpu->mmio_cur_fragment = 0; 6369 6370 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len); 6371 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write; 6372 vcpu->run->exit_reason = KVM_EXIT_MMIO; 6373 vcpu->run->mmio.phys_addr = gpa; 6374 6375 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); 6376 } 6377 6378 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, 6379 unsigned long addr, 6380 void *val, 6381 unsigned int bytes, 6382 struct x86_exception *exception) 6383 { 6384 return emulator_read_write(ctxt, addr, val, bytes, 6385 exception, &read_emultor); 6386 } 6387 6388 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, 6389 unsigned long addr, 6390 const void *val, 6391 unsigned int bytes, 6392 struct x86_exception *exception) 6393 { 6394 return emulator_read_write(ctxt, addr, (void *)val, bytes, 6395 exception, &write_emultor); 6396 } 6397 6398 #define CMPXCHG_TYPE(t, ptr, old, new) \ 6399 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old)) 6400 6401 #ifdef CONFIG_X86_64 6402 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new) 6403 #else 6404 # define CMPXCHG64(ptr, old, new) \ 6405 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old)) 6406 #endif 6407 6408 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, 6409 unsigned long addr, 6410 const void *old, 6411 const void *new, 6412 unsigned int bytes, 6413 struct x86_exception *exception) 6414 { 6415 struct kvm_host_map map; 6416 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6417 u64 page_line_mask; 6418 gpa_t gpa; 6419 char *kaddr; 6420 bool exchanged; 6421 6422 /* guests cmpxchg8b have to be emulated atomically */ 6423 if (bytes > 8 || (bytes & (bytes - 1))) 6424 goto emul_write; 6425 6426 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); 6427 6428 if (gpa == UNMAPPED_GVA || 6429 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 6430 goto emul_write; 6431 6432 /* 6433 * Emulate the atomic as a straight write to avoid #AC if SLD is 6434 * enabled in the host and the access splits a cache line. 6435 */ 6436 if (boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT)) 6437 page_line_mask = ~(cache_line_size() - 1); 6438 else 6439 page_line_mask = PAGE_MASK; 6440 6441 if (((gpa + bytes - 1) & page_line_mask) != (gpa & page_line_mask)) 6442 goto emul_write; 6443 6444 if (kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), &map)) 6445 goto emul_write; 6446 6447 kaddr = map.hva + offset_in_page(gpa); 6448 6449 switch (bytes) { 6450 case 1: 6451 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new); 6452 break; 6453 case 2: 6454 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new); 6455 break; 6456 case 4: 6457 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new); 6458 break; 6459 case 8: 6460 exchanged = CMPXCHG64(kaddr, old, new); 6461 break; 6462 default: 6463 BUG(); 6464 } 6465 6466 kvm_vcpu_unmap(vcpu, &map, true); 6467 6468 if (!exchanged) 6469 return X86EMUL_CMPXCHG_FAILED; 6470 6471 kvm_page_track_write(vcpu, gpa, new, bytes); 6472 6473 return X86EMUL_CONTINUE; 6474 6475 emul_write: 6476 printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); 6477 6478 return emulator_write_emulated(ctxt, addr, new, bytes, exception); 6479 } 6480 6481 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) 6482 { 6483 int r = 0, i; 6484 6485 for (i = 0; i < vcpu->arch.pio.count; i++) { 6486 if (vcpu->arch.pio.in) 6487 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port, 6488 vcpu->arch.pio.size, pd); 6489 else 6490 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, 6491 vcpu->arch.pio.port, vcpu->arch.pio.size, 6492 pd); 6493 if (r) 6494 break; 6495 pd += vcpu->arch.pio.size; 6496 } 6497 return r; 6498 } 6499 6500 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, 6501 unsigned short port, void *val, 6502 unsigned int count, bool in) 6503 { 6504 vcpu->arch.pio.port = port; 6505 vcpu->arch.pio.in = in; 6506 vcpu->arch.pio.count = count; 6507 vcpu->arch.pio.size = size; 6508 6509 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { 6510 vcpu->arch.pio.count = 0; 6511 return 1; 6512 } 6513 6514 vcpu->run->exit_reason = KVM_EXIT_IO; 6515 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; 6516 vcpu->run->io.size = size; 6517 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; 6518 vcpu->run->io.count = count; 6519 vcpu->run->io.port = port; 6520 6521 return 0; 6522 } 6523 6524 static int emulator_pio_in(struct kvm_vcpu *vcpu, int size, 6525 unsigned short port, void *val, unsigned int count) 6526 { 6527 int ret; 6528 6529 if (vcpu->arch.pio.count) 6530 goto data_avail; 6531 6532 memset(vcpu->arch.pio_data, 0, size * count); 6533 6534 ret = emulator_pio_in_out(vcpu, size, port, val, count, true); 6535 if (ret) { 6536 data_avail: 6537 memcpy(val, vcpu->arch.pio_data, size * count); 6538 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); 6539 vcpu->arch.pio.count = 0; 6540 return 1; 6541 } 6542 6543 return 0; 6544 } 6545 6546 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, 6547 int size, unsigned short port, void *val, 6548 unsigned int count) 6549 { 6550 return emulator_pio_in(emul_to_vcpu(ctxt), size, port, val, count); 6551 6552 } 6553 6554 static int emulator_pio_out(struct kvm_vcpu *vcpu, int size, 6555 unsigned short port, const void *val, 6556 unsigned int count) 6557 { 6558 memcpy(vcpu->arch.pio_data, val, size * count); 6559 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); 6560 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); 6561 } 6562 6563 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, 6564 int size, unsigned short port, 6565 const void *val, unsigned int count) 6566 { 6567 return emulator_pio_out(emul_to_vcpu(ctxt), size, port, val, count); 6568 } 6569 6570 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) 6571 { 6572 return static_call(kvm_x86_get_segment_base)(vcpu, seg); 6573 } 6574 6575 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address) 6576 { 6577 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address); 6578 } 6579 6580 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu) 6581 { 6582 if (!need_emulate_wbinvd(vcpu)) 6583 return X86EMUL_CONTINUE; 6584 6585 if (static_call(kvm_x86_has_wbinvd_exit)()) { 6586 int cpu = get_cpu(); 6587 6588 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 6589 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask, 6590 wbinvd_ipi, NULL, 1); 6591 put_cpu(); 6592 cpumask_clear(vcpu->arch.wbinvd_dirty_mask); 6593 } else 6594 wbinvd(); 6595 return X86EMUL_CONTINUE; 6596 } 6597 6598 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu) 6599 { 6600 kvm_emulate_wbinvd_noskip(vcpu); 6601 return kvm_skip_emulated_instruction(vcpu); 6602 } 6603 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd); 6604 6605 6606 6607 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt) 6608 { 6609 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt)); 6610 } 6611 6612 static void emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, 6613 unsigned long *dest) 6614 { 6615 kvm_get_dr(emul_to_vcpu(ctxt), dr, dest); 6616 } 6617 6618 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, 6619 unsigned long value) 6620 { 6621 6622 return kvm_set_dr(emul_to_vcpu(ctxt), dr, value); 6623 } 6624 6625 static u64 mk_cr_64(u64 curr_cr, u32 new_val) 6626 { 6627 return (curr_cr & ~((1ULL << 32) - 1)) | new_val; 6628 } 6629 6630 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr) 6631 { 6632 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6633 unsigned long value; 6634 6635 switch (cr) { 6636 case 0: 6637 value = kvm_read_cr0(vcpu); 6638 break; 6639 case 2: 6640 value = vcpu->arch.cr2; 6641 break; 6642 case 3: 6643 value = kvm_read_cr3(vcpu); 6644 break; 6645 case 4: 6646 value = kvm_read_cr4(vcpu); 6647 break; 6648 case 8: 6649 value = kvm_get_cr8(vcpu); 6650 break; 6651 default: 6652 kvm_err("%s: unexpected cr %u\n", __func__, cr); 6653 return 0; 6654 } 6655 6656 return value; 6657 } 6658 6659 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val) 6660 { 6661 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6662 int res = 0; 6663 6664 switch (cr) { 6665 case 0: 6666 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); 6667 break; 6668 case 2: 6669 vcpu->arch.cr2 = val; 6670 break; 6671 case 3: 6672 res = kvm_set_cr3(vcpu, val); 6673 break; 6674 case 4: 6675 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); 6676 break; 6677 case 8: 6678 res = kvm_set_cr8(vcpu, val); 6679 break; 6680 default: 6681 kvm_err("%s: unexpected cr %u\n", __func__, cr); 6682 res = -1; 6683 } 6684 6685 return res; 6686 } 6687 6688 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt) 6689 { 6690 return static_call(kvm_x86_get_cpl)(emul_to_vcpu(ctxt)); 6691 } 6692 6693 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6694 { 6695 static_call(kvm_x86_get_gdt)(emul_to_vcpu(ctxt), dt); 6696 } 6697 6698 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6699 { 6700 static_call(kvm_x86_get_idt)(emul_to_vcpu(ctxt), dt); 6701 } 6702 6703 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6704 { 6705 static_call(kvm_x86_set_gdt)(emul_to_vcpu(ctxt), dt); 6706 } 6707 6708 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6709 { 6710 static_call(kvm_x86_set_idt)(emul_to_vcpu(ctxt), dt); 6711 } 6712 6713 static unsigned long emulator_get_cached_segment_base( 6714 struct x86_emulate_ctxt *ctxt, int seg) 6715 { 6716 return get_segment_base(emul_to_vcpu(ctxt), seg); 6717 } 6718 6719 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector, 6720 struct desc_struct *desc, u32 *base3, 6721 int seg) 6722 { 6723 struct kvm_segment var; 6724 6725 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg); 6726 *selector = var.selector; 6727 6728 if (var.unusable) { 6729 memset(desc, 0, sizeof(*desc)); 6730 if (base3) 6731 *base3 = 0; 6732 return false; 6733 } 6734 6735 if (var.g) 6736 var.limit >>= 12; 6737 set_desc_limit(desc, var.limit); 6738 set_desc_base(desc, (unsigned long)var.base); 6739 #ifdef CONFIG_X86_64 6740 if (base3) 6741 *base3 = var.base >> 32; 6742 #endif 6743 desc->type = var.type; 6744 desc->s = var.s; 6745 desc->dpl = var.dpl; 6746 desc->p = var.present; 6747 desc->avl = var.avl; 6748 desc->l = var.l; 6749 desc->d = var.db; 6750 desc->g = var.g; 6751 6752 return true; 6753 } 6754 6755 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector, 6756 struct desc_struct *desc, u32 base3, 6757 int seg) 6758 { 6759 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6760 struct kvm_segment var; 6761 6762 var.selector = selector; 6763 var.base = get_desc_base(desc); 6764 #ifdef CONFIG_X86_64 6765 var.base |= ((u64)base3) << 32; 6766 #endif 6767 var.limit = get_desc_limit(desc); 6768 if (desc->g) 6769 var.limit = (var.limit << 12) | 0xfff; 6770 var.type = desc->type; 6771 var.dpl = desc->dpl; 6772 var.db = desc->d; 6773 var.s = desc->s; 6774 var.l = desc->l; 6775 var.g = desc->g; 6776 var.avl = desc->avl; 6777 var.present = desc->p; 6778 var.unusable = !var.present; 6779 var.padding = 0; 6780 6781 kvm_set_segment(vcpu, &var, seg); 6782 return; 6783 } 6784 6785 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, 6786 u32 msr_index, u64 *pdata) 6787 { 6788 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6789 int r; 6790 6791 r = kvm_get_msr(vcpu, msr_index, pdata); 6792 6793 if (r && kvm_get_msr_user_space(vcpu, msr_index, r)) { 6794 /* Bounce to user space */ 6795 return X86EMUL_IO_NEEDED; 6796 } 6797 6798 return r; 6799 } 6800 6801 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, 6802 u32 msr_index, u64 data) 6803 { 6804 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6805 int r; 6806 6807 r = kvm_set_msr(vcpu, msr_index, data); 6808 6809 if (r && kvm_set_msr_user_space(vcpu, msr_index, data, r)) { 6810 /* Bounce to user space */ 6811 return X86EMUL_IO_NEEDED; 6812 } 6813 6814 return r; 6815 } 6816 6817 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt) 6818 { 6819 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6820 6821 return vcpu->arch.smbase; 6822 } 6823 6824 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase) 6825 { 6826 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6827 6828 vcpu->arch.smbase = smbase; 6829 } 6830 6831 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt, 6832 u32 pmc) 6833 { 6834 return kvm_pmu_is_valid_rdpmc_ecx(emul_to_vcpu(ctxt), pmc); 6835 } 6836 6837 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, 6838 u32 pmc, u64 *pdata) 6839 { 6840 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata); 6841 } 6842 6843 static void emulator_halt(struct x86_emulate_ctxt *ctxt) 6844 { 6845 emul_to_vcpu(ctxt)->arch.halt_request = 1; 6846 } 6847 6848 static int emulator_intercept(struct x86_emulate_ctxt *ctxt, 6849 struct x86_instruction_info *info, 6850 enum x86_intercept_stage stage) 6851 { 6852 return static_call(kvm_x86_check_intercept)(emul_to_vcpu(ctxt), info, stage, 6853 &ctxt->exception); 6854 } 6855 6856 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, 6857 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, 6858 bool exact_only) 6859 { 6860 return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, exact_only); 6861 } 6862 6863 static bool emulator_guest_has_long_mode(struct x86_emulate_ctxt *ctxt) 6864 { 6865 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_LM); 6866 } 6867 6868 static bool emulator_guest_has_movbe(struct x86_emulate_ctxt *ctxt) 6869 { 6870 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_MOVBE); 6871 } 6872 6873 static bool emulator_guest_has_fxsr(struct x86_emulate_ctxt *ctxt) 6874 { 6875 return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_FXSR); 6876 } 6877 6878 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) 6879 { 6880 return kvm_register_read(emul_to_vcpu(ctxt), reg); 6881 } 6882 6883 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) 6884 { 6885 kvm_register_write(emul_to_vcpu(ctxt), reg, val); 6886 } 6887 6888 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked) 6889 { 6890 static_call(kvm_x86_set_nmi_mask)(emul_to_vcpu(ctxt), masked); 6891 } 6892 6893 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt) 6894 { 6895 return emul_to_vcpu(ctxt)->arch.hflags; 6896 } 6897 6898 static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags) 6899 { 6900 emul_to_vcpu(ctxt)->arch.hflags = emul_flags; 6901 } 6902 6903 static int emulator_pre_leave_smm(struct x86_emulate_ctxt *ctxt, 6904 const char *smstate) 6905 { 6906 return static_call(kvm_x86_pre_leave_smm)(emul_to_vcpu(ctxt), smstate); 6907 } 6908 6909 static void emulator_post_leave_smm(struct x86_emulate_ctxt *ctxt) 6910 { 6911 kvm_smm_changed(emul_to_vcpu(ctxt)); 6912 } 6913 6914 static int emulator_set_xcr(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr) 6915 { 6916 return __kvm_set_xcr(emul_to_vcpu(ctxt), index, xcr); 6917 } 6918 6919 static const struct x86_emulate_ops emulate_ops = { 6920 .read_gpr = emulator_read_gpr, 6921 .write_gpr = emulator_write_gpr, 6922 .read_std = emulator_read_std, 6923 .write_std = emulator_write_std, 6924 .read_phys = kvm_read_guest_phys_system, 6925 .fetch = kvm_fetch_guest_virt, 6926 .read_emulated = emulator_read_emulated, 6927 .write_emulated = emulator_write_emulated, 6928 .cmpxchg_emulated = emulator_cmpxchg_emulated, 6929 .invlpg = emulator_invlpg, 6930 .pio_in_emulated = emulator_pio_in_emulated, 6931 .pio_out_emulated = emulator_pio_out_emulated, 6932 .get_segment = emulator_get_segment, 6933 .set_segment = emulator_set_segment, 6934 .get_cached_segment_base = emulator_get_cached_segment_base, 6935 .get_gdt = emulator_get_gdt, 6936 .get_idt = emulator_get_idt, 6937 .set_gdt = emulator_set_gdt, 6938 .set_idt = emulator_set_idt, 6939 .get_cr = emulator_get_cr, 6940 .set_cr = emulator_set_cr, 6941 .cpl = emulator_get_cpl, 6942 .get_dr = emulator_get_dr, 6943 .set_dr = emulator_set_dr, 6944 .get_smbase = emulator_get_smbase, 6945 .set_smbase = emulator_set_smbase, 6946 .set_msr = emulator_set_msr, 6947 .get_msr = emulator_get_msr, 6948 .check_pmc = emulator_check_pmc, 6949 .read_pmc = emulator_read_pmc, 6950 .halt = emulator_halt, 6951 .wbinvd = emulator_wbinvd, 6952 .fix_hypercall = emulator_fix_hypercall, 6953 .intercept = emulator_intercept, 6954 .get_cpuid = emulator_get_cpuid, 6955 .guest_has_long_mode = emulator_guest_has_long_mode, 6956 .guest_has_movbe = emulator_guest_has_movbe, 6957 .guest_has_fxsr = emulator_guest_has_fxsr, 6958 .set_nmi_mask = emulator_set_nmi_mask, 6959 .get_hflags = emulator_get_hflags, 6960 .set_hflags = emulator_set_hflags, 6961 .pre_leave_smm = emulator_pre_leave_smm, 6962 .post_leave_smm = emulator_post_leave_smm, 6963 .set_xcr = emulator_set_xcr, 6964 }; 6965 6966 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) 6967 { 6968 u32 int_shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu); 6969 /* 6970 * an sti; sti; sequence only disable interrupts for the first 6971 * instruction. So, if the last instruction, be it emulated or 6972 * not, left the system with the INT_STI flag enabled, it 6973 * means that the last instruction is an sti. We should not 6974 * leave the flag on in this case. The same goes for mov ss 6975 */ 6976 if (int_shadow & mask) 6977 mask = 0; 6978 if (unlikely(int_shadow || mask)) { 6979 static_call(kvm_x86_set_interrupt_shadow)(vcpu, mask); 6980 if (!mask) 6981 kvm_make_request(KVM_REQ_EVENT, vcpu); 6982 } 6983 } 6984 6985 static bool inject_emulated_exception(struct kvm_vcpu *vcpu) 6986 { 6987 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 6988 if (ctxt->exception.vector == PF_VECTOR) 6989 return kvm_inject_emulated_page_fault(vcpu, &ctxt->exception); 6990 6991 if (ctxt->exception.error_code_valid) 6992 kvm_queue_exception_e(vcpu, ctxt->exception.vector, 6993 ctxt->exception.error_code); 6994 else 6995 kvm_queue_exception(vcpu, ctxt->exception.vector); 6996 return false; 6997 } 6998 6999 static struct x86_emulate_ctxt *alloc_emulate_ctxt(struct kvm_vcpu *vcpu) 7000 { 7001 struct x86_emulate_ctxt *ctxt; 7002 7003 ctxt = kmem_cache_zalloc(x86_emulator_cache, GFP_KERNEL_ACCOUNT); 7004 if (!ctxt) { 7005 pr_err("kvm: failed to allocate vcpu's emulator\n"); 7006 return NULL; 7007 } 7008 7009 ctxt->vcpu = vcpu; 7010 ctxt->ops = &emulate_ops; 7011 vcpu->arch.emulate_ctxt = ctxt; 7012 7013 return ctxt; 7014 } 7015 7016 static void init_emulate_ctxt(struct kvm_vcpu *vcpu) 7017 { 7018 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 7019 int cs_db, cs_l; 7020 7021 static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l); 7022 7023 ctxt->gpa_available = false; 7024 ctxt->eflags = kvm_get_rflags(vcpu); 7025 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0; 7026 7027 ctxt->eip = kvm_rip_read(vcpu); 7028 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : 7029 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : 7030 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 : 7031 cs_db ? X86EMUL_MODE_PROT32 : 7032 X86EMUL_MODE_PROT16; 7033 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK); 7034 BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); 7035 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK); 7036 7037 init_decode_cache(ctxt); 7038 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 7039 } 7040 7041 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) 7042 { 7043 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 7044 int ret; 7045 7046 init_emulate_ctxt(vcpu); 7047 7048 ctxt->op_bytes = 2; 7049 ctxt->ad_bytes = 2; 7050 ctxt->_eip = ctxt->eip + inc_eip; 7051 ret = emulate_int_real(ctxt, irq); 7052 7053 if (ret != X86EMUL_CONTINUE) { 7054 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 7055 } else { 7056 ctxt->eip = ctxt->_eip; 7057 kvm_rip_write(vcpu, ctxt->eip); 7058 kvm_set_rflags(vcpu, ctxt->eflags); 7059 } 7060 } 7061 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt); 7062 7063 static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type) 7064 { 7065 ++vcpu->stat.insn_emulation_fail; 7066 trace_kvm_emulate_insn_failed(vcpu); 7067 7068 if (emulation_type & EMULTYPE_VMWARE_GP) { 7069 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 7070 return 1; 7071 } 7072 7073 if (emulation_type & EMULTYPE_SKIP) { 7074 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 7075 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 7076 vcpu->run->internal.ndata = 0; 7077 return 0; 7078 } 7079 7080 kvm_queue_exception(vcpu, UD_VECTOR); 7081 7082 if (!is_guest_mode(vcpu) && static_call(kvm_x86_get_cpl)(vcpu) == 0) { 7083 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 7084 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 7085 vcpu->run->internal.ndata = 0; 7086 return 0; 7087 } 7088 7089 return 1; 7090 } 7091 7092 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, 7093 bool write_fault_to_shadow_pgtable, 7094 int emulation_type) 7095 { 7096 gpa_t gpa = cr2_or_gpa; 7097 kvm_pfn_t pfn; 7098 7099 if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF)) 7100 return false; 7101 7102 if (WARN_ON_ONCE(is_guest_mode(vcpu)) || 7103 WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF))) 7104 return false; 7105 7106 if (!vcpu->arch.mmu->direct_map) { 7107 /* 7108 * Write permission should be allowed since only 7109 * write access need to be emulated. 7110 */ 7111 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL); 7112 7113 /* 7114 * If the mapping is invalid in guest, let cpu retry 7115 * it to generate fault. 7116 */ 7117 if (gpa == UNMAPPED_GVA) 7118 return true; 7119 } 7120 7121 /* 7122 * Do not retry the unhandleable instruction if it faults on the 7123 * readonly host memory, otherwise it will goto a infinite loop: 7124 * retry instruction -> write #PF -> emulation fail -> retry 7125 * instruction -> ... 7126 */ 7127 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); 7128 7129 /* 7130 * If the instruction failed on the error pfn, it can not be fixed, 7131 * report the error to userspace. 7132 */ 7133 if (is_error_noslot_pfn(pfn)) 7134 return false; 7135 7136 kvm_release_pfn_clean(pfn); 7137 7138 /* The instructions are well-emulated on direct mmu. */ 7139 if (vcpu->arch.mmu->direct_map) { 7140 unsigned int indirect_shadow_pages; 7141 7142 write_lock(&vcpu->kvm->mmu_lock); 7143 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; 7144 write_unlock(&vcpu->kvm->mmu_lock); 7145 7146 if (indirect_shadow_pages) 7147 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 7148 7149 return true; 7150 } 7151 7152 /* 7153 * if emulation was due to access to shadowed page table 7154 * and it failed try to unshadow page and re-enter the 7155 * guest to let CPU execute the instruction. 7156 */ 7157 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 7158 7159 /* 7160 * If the access faults on its page table, it can not 7161 * be fixed by unprotecting shadow page and it should 7162 * be reported to userspace. 7163 */ 7164 return !write_fault_to_shadow_pgtable; 7165 } 7166 7167 static bool retry_instruction(struct x86_emulate_ctxt *ctxt, 7168 gpa_t cr2_or_gpa, int emulation_type) 7169 { 7170 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 7171 unsigned long last_retry_eip, last_retry_addr, gpa = cr2_or_gpa; 7172 7173 last_retry_eip = vcpu->arch.last_retry_eip; 7174 last_retry_addr = vcpu->arch.last_retry_addr; 7175 7176 /* 7177 * If the emulation is caused by #PF and it is non-page_table 7178 * writing instruction, it means the VM-EXIT is caused by shadow 7179 * page protected, we can zap the shadow page and retry this 7180 * instruction directly. 7181 * 7182 * Note: if the guest uses a non-page-table modifying instruction 7183 * on the PDE that points to the instruction, then we will unmap 7184 * the instruction and go to an infinite loop. So, we cache the 7185 * last retried eip and the last fault address, if we meet the eip 7186 * and the address again, we can break out of the potential infinite 7187 * loop. 7188 */ 7189 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0; 7190 7191 if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF)) 7192 return false; 7193 7194 if (WARN_ON_ONCE(is_guest_mode(vcpu)) || 7195 WARN_ON_ONCE(!(emulation_type & EMULTYPE_PF))) 7196 return false; 7197 7198 if (x86_page_table_writing_insn(ctxt)) 7199 return false; 7200 7201 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2_or_gpa) 7202 return false; 7203 7204 vcpu->arch.last_retry_eip = ctxt->eip; 7205 vcpu->arch.last_retry_addr = cr2_or_gpa; 7206 7207 if (!vcpu->arch.mmu->direct_map) 7208 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL); 7209 7210 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 7211 7212 return true; 7213 } 7214 7215 static int complete_emulated_mmio(struct kvm_vcpu *vcpu); 7216 static int complete_emulated_pio(struct kvm_vcpu *vcpu); 7217 7218 static void kvm_smm_changed(struct kvm_vcpu *vcpu) 7219 { 7220 if (!(vcpu->arch.hflags & HF_SMM_MASK)) { 7221 /* This is a good place to trace that we are exiting SMM. */ 7222 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, false); 7223 7224 /* Process a latched INIT or SMI, if any. */ 7225 kvm_make_request(KVM_REQ_EVENT, vcpu); 7226 } 7227 7228 kvm_mmu_reset_context(vcpu); 7229 } 7230 7231 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7, 7232 unsigned long *db) 7233 { 7234 u32 dr6 = 0; 7235 int i; 7236 u32 enable, rwlen; 7237 7238 enable = dr7; 7239 rwlen = dr7 >> 16; 7240 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4) 7241 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr) 7242 dr6 |= (1 << i); 7243 return dr6; 7244 } 7245 7246 static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu) 7247 { 7248 struct kvm_run *kvm_run = vcpu->run; 7249 7250 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { 7251 kvm_run->debug.arch.dr6 = DR6_BS | DR6_ACTIVE_LOW; 7252 kvm_run->debug.arch.pc = kvm_get_linear_rip(vcpu); 7253 kvm_run->debug.arch.exception = DB_VECTOR; 7254 kvm_run->exit_reason = KVM_EXIT_DEBUG; 7255 return 0; 7256 } 7257 kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS); 7258 return 1; 7259 } 7260 7261 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu) 7262 { 7263 unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu); 7264 int r; 7265 7266 r = static_call(kvm_x86_skip_emulated_instruction)(vcpu); 7267 if (unlikely(!r)) 7268 return 0; 7269 7270 /* 7271 * rflags is the old, "raw" value of the flags. The new value has 7272 * not been saved yet. 7273 * 7274 * This is correct even for TF set by the guest, because "the 7275 * processor will not generate this exception after the instruction 7276 * that sets the TF flag". 7277 */ 7278 if (unlikely(rflags & X86_EFLAGS_TF)) 7279 r = kvm_vcpu_do_singlestep(vcpu); 7280 return r; 7281 } 7282 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction); 7283 7284 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) 7285 { 7286 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) && 7287 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) { 7288 struct kvm_run *kvm_run = vcpu->run; 7289 unsigned long eip = kvm_get_linear_rip(vcpu); 7290 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 7291 vcpu->arch.guest_debug_dr7, 7292 vcpu->arch.eff_db); 7293 7294 if (dr6 != 0) { 7295 kvm_run->debug.arch.dr6 = dr6 | DR6_ACTIVE_LOW; 7296 kvm_run->debug.arch.pc = eip; 7297 kvm_run->debug.arch.exception = DB_VECTOR; 7298 kvm_run->exit_reason = KVM_EXIT_DEBUG; 7299 *r = 0; 7300 return true; 7301 } 7302 } 7303 7304 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) && 7305 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) { 7306 unsigned long eip = kvm_get_linear_rip(vcpu); 7307 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 7308 vcpu->arch.dr7, 7309 vcpu->arch.db); 7310 7311 if (dr6 != 0) { 7312 kvm_queue_exception_p(vcpu, DB_VECTOR, dr6); 7313 *r = 1; 7314 return true; 7315 } 7316 } 7317 7318 return false; 7319 } 7320 7321 static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt) 7322 { 7323 switch (ctxt->opcode_len) { 7324 case 1: 7325 switch (ctxt->b) { 7326 case 0xe4: /* IN */ 7327 case 0xe5: 7328 case 0xec: 7329 case 0xed: 7330 case 0xe6: /* OUT */ 7331 case 0xe7: 7332 case 0xee: 7333 case 0xef: 7334 case 0x6c: /* INS */ 7335 case 0x6d: 7336 case 0x6e: /* OUTS */ 7337 case 0x6f: 7338 return true; 7339 } 7340 break; 7341 case 2: 7342 switch (ctxt->b) { 7343 case 0x33: /* RDPMC */ 7344 return true; 7345 } 7346 break; 7347 } 7348 7349 return false; 7350 } 7351 7352 /* 7353 * Decode to be emulated instruction. Return EMULATION_OK if success. 7354 */ 7355 int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type, 7356 void *insn, int insn_len) 7357 { 7358 int r = EMULATION_OK; 7359 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 7360 7361 init_emulate_ctxt(vcpu); 7362 7363 /* 7364 * We will reenter on the same instruction since we do not set 7365 * complete_userspace_io. This does not handle watchpoints yet, 7366 * those would be handled in the emulate_ops. 7367 */ 7368 if (!(emulation_type & EMULTYPE_SKIP) && 7369 kvm_vcpu_check_breakpoint(vcpu, &r)) 7370 return r; 7371 7372 ctxt->interruptibility = 0; 7373 ctxt->have_exception = false; 7374 ctxt->exception.vector = -1; 7375 ctxt->perm_ok = false; 7376 7377 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD; 7378 7379 r = x86_decode_insn(ctxt, insn, insn_len); 7380 7381 trace_kvm_emulate_insn_start(vcpu); 7382 ++vcpu->stat.insn_emulation; 7383 7384 return r; 7385 } 7386 EXPORT_SYMBOL_GPL(x86_decode_emulated_instruction); 7387 7388 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, 7389 int emulation_type, void *insn, int insn_len) 7390 { 7391 int r; 7392 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 7393 bool writeback = true; 7394 bool write_fault_to_spt; 7395 7396 if (unlikely(!static_call(kvm_x86_can_emulate_instruction)(vcpu, insn, insn_len))) 7397 return 1; 7398 7399 vcpu->arch.l1tf_flush_l1d = true; 7400 7401 /* 7402 * Clear write_fault_to_shadow_pgtable here to ensure it is 7403 * never reused. 7404 */ 7405 write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable; 7406 vcpu->arch.write_fault_to_shadow_pgtable = false; 7407 7408 if (!(emulation_type & EMULTYPE_NO_DECODE)) { 7409 kvm_clear_exception_queue(vcpu); 7410 7411 r = x86_decode_emulated_instruction(vcpu, emulation_type, 7412 insn, insn_len); 7413 if (r != EMULATION_OK) { 7414 if ((emulation_type & EMULTYPE_TRAP_UD) || 7415 (emulation_type & EMULTYPE_TRAP_UD_FORCED)) { 7416 kvm_queue_exception(vcpu, UD_VECTOR); 7417 return 1; 7418 } 7419 if (reexecute_instruction(vcpu, cr2_or_gpa, 7420 write_fault_to_spt, 7421 emulation_type)) 7422 return 1; 7423 if (ctxt->have_exception) { 7424 /* 7425 * #UD should result in just EMULATION_FAILED, and trap-like 7426 * exception should not be encountered during decode. 7427 */ 7428 WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR || 7429 exception_type(ctxt->exception.vector) == EXCPT_TRAP); 7430 inject_emulated_exception(vcpu); 7431 return 1; 7432 } 7433 return handle_emulation_failure(vcpu, emulation_type); 7434 } 7435 } 7436 7437 if ((emulation_type & EMULTYPE_VMWARE_GP) && 7438 !is_vmware_backdoor_opcode(ctxt)) { 7439 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 7440 return 1; 7441 } 7442 7443 /* 7444 * Note, EMULTYPE_SKIP is intended for use *only* by vendor callbacks 7445 * for kvm_skip_emulated_instruction(). The caller is responsible for 7446 * updating interruptibility state and injecting single-step #DBs. 7447 */ 7448 if (emulation_type & EMULTYPE_SKIP) { 7449 kvm_rip_write(vcpu, ctxt->_eip); 7450 if (ctxt->eflags & X86_EFLAGS_RF) 7451 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF); 7452 return 1; 7453 } 7454 7455 if (retry_instruction(ctxt, cr2_or_gpa, emulation_type)) 7456 return 1; 7457 7458 /* this is needed for vmware backdoor interface to work since it 7459 changes registers values during IO operation */ 7460 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { 7461 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 7462 emulator_invalidate_register_cache(ctxt); 7463 } 7464 7465 restart: 7466 if (emulation_type & EMULTYPE_PF) { 7467 /* Save the faulting GPA (cr2) in the address field */ 7468 ctxt->exception.address = cr2_or_gpa; 7469 7470 /* With shadow page tables, cr2 contains a GVA or nGPA. */ 7471 if (vcpu->arch.mmu->direct_map) { 7472 ctxt->gpa_available = true; 7473 ctxt->gpa_val = cr2_or_gpa; 7474 } 7475 } else { 7476 /* Sanitize the address out of an abundance of paranoia. */ 7477 ctxt->exception.address = 0; 7478 } 7479 7480 r = x86_emulate_insn(ctxt); 7481 7482 if (r == EMULATION_INTERCEPTED) 7483 return 1; 7484 7485 if (r == EMULATION_FAILED) { 7486 if (reexecute_instruction(vcpu, cr2_or_gpa, write_fault_to_spt, 7487 emulation_type)) 7488 return 1; 7489 7490 return handle_emulation_failure(vcpu, emulation_type); 7491 } 7492 7493 if (ctxt->have_exception) { 7494 r = 1; 7495 if (inject_emulated_exception(vcpu)) 7496 return r; 7497 } else if (vcpu->arch.pio.count) { 7498 if (!vcpu->arch.pio.in) { 7499 /* FIXME: return into emulator if single-stepping. */ 7500 vcpu->arch.pio.count = 0; 7501 } else { 7502 writeback = false; 7503 vcpu->arch.complete_userspace_io = complete_emulated_pio; 7504 } 7505 r = 0; 7506 } else if (vcpu->mmio_needed) { 7507 ++vcpu->stat.mmio_exits; 7508 7509 if (!vcpu->mmio_is_write) 7510 writeback = false; 7511 r = 0; 7512 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 7513 } else if (r == EMULATION_RESTART) 7514 goto restart; 7515 else 7516 r = 1; 7517 7518 if (writeback) { 7519 unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu); 7520 toggle_interruptibility(vcpu, ctxt->interruptibility); 7521 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 7522 if (!ctxt->have_exception || 7523 exception_type(ctxt->exception.vector) == EXCPT_TRAP) { 7524 kvm_rip_write(vcpu, ctxt->eip); 7525 if (r && (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP))) 7526 r = kvm_vcpu_do_singlestep(vcpu); 7527 if (kvm_x86_ops.update_emulated_instruction) 7528 static_call(kvm_x86_update_emulated_instruction)(vcpu); 7529 __kvm_set_rflags(vcpu, ctxt->eflags); 7530 } 7531 7532 /* 7533 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will 7534 * do nothing, and it will be requested again as soon as 7535 * the shadow expires. But we still need to check here, 7536 * because POPF has no interrupt shadow. 7537 */ 7538 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF)) 7539 kvm_make_request(KVM_REQ_EVENT, vcpu); 7540 } else 7541 vcpu->arch.emulate_regs_need_sync_to_vcpu = true; 7542 7543 return r; 7544 } 7545 7546 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type) 7547 { 7548 return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0); 7549 } 7550 EXPORT_SYMBOL_GPL(kvm_emulate_instruction); 7551 7552 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu, 7553 void *insn, int insn_len) 7554 { 7555 return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len); 7556 } 7557 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer); 7558 7559 static int complete_fast_pio_out_port_0x7e(struct kvm_vcpu *vcpu) 7560 { 7561 vcpu->arch.pio.count = 0; 7562 return 1; 7563 } 7564 7565 static int complete_fast_pio_out(struct kvm_vcpu *vcpu) 7566 { 7567 vcpu->arch.pio.count = 0; 7568 7569 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) 7570 return 1; 7571 7572 return kvm_skip_emulated_instruction(vcpu); 7573 } 7574 7575 static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, 7576 unsigned short port) 7577 { 7578 unsigned long val = kvm_rax_read(vcpu); 7579 int ret = emulator_pio_out(vcpu, size, port, &val, 1); 7580 7581 if (ret) 7582 return ret; 7583 7584 /* 7585 * Workaround userspace that relies on old KVM behavior of %rip being 7586 * incremented prior to exiting to userspace to handle "OUT 0x7e". 7587 */ 7588 if (port == 0x7e && 7589 kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_OUT_7E_INC_RIP)) { 7590 vcpu->arch.complete_userspace_io = 7591 complete_fast_pio_out_port_0x7e; 7592 kvm_skip_emulated_instruction(vcpu); 7593 } else { 7594 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu); 7595 vcpu->arch.complete_userspace_io = complete_fast_pio_out; 7596 } 7597 return 0; 7598 } 7599 7600 static int complete_fast_pio_in(struct kvm_vcpu *vcpu) 7601 { 7602 unsigned long val; 7603 7604 /* We should only ever be called with arch.pio.count equal to 1 */ 7605 BUG_ON(vcpu->arch.pio.count != 1); 7606 7607 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) { 7608 vcpu->arch.pio.count = 0; 7609 return 1; 7610 } 7611 7612 /* For size less than 4 we merge, else we zero extend */ 7613 val = (vcpu->arch.pio.size < 4) ? kvm_rax_read(vcpu) : 0; 7614 7615 /* 7616 * Since vcpu->arch.pio.count == 1 let emulator_pio_in perform 7617 * the copy and tracing 7618 */ 7619 emulator_pio_in(vcpu, vcpu->arch.pio.size, vcpu->arch.pio.port, &val, 1); 7620 kvm_rax_write(vcpu, val); 7621 7622 return kvm_skip_emulated_instruction(vcpu); 7623 } 7624 7625 static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, 7626 unsigned short port) 7627 { 7628 unsigned long val; 7629 int ret; 7630 7631 /* For size less than 4 we merge, else we zero extend */ 7632 val = (size < 4) ? kvm_rax_read(vcpu) : 0; 7633 7634 ret = emulator_pio_in(vcpu, size, port, &val, 1); 7635 if (ret) { 7636 kvm_rax_write(vcpu, val); 7637 return ret; 7638 } 7639 7640 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu); 7641 vcpu->arch.complete_userspace_io = complete_fast_pio_in; 7642 7643 return 0; 7644 } 7645 7646 int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in) 7647 { 7648 int ret; 7649 7650 if (in) 7651 ret = kvm_fast_pio_in(vcpu, size, port); 7652 else 7653 ret = kvm_fast_pio_out(vcpu, size, port); 7654 return ret && kvm_skip_emulated_instruction(vcpu); 7655 } 7656 EXPORT_SYMBOL_GPL(kvm_fast_pio); 7657 7658 static int kvmclock_cpu_down_prep(unsigned int cpu) 7659 { 7660 __this_cpu_write(cpu_tsc_khz, 0); 7661 return 0; 7662 } 7663 7664 static void tsc_khz_changed(void *data) 7665 { 7666 struct cpufreq_freqs *freq = data; 7667 unsigned long khz = 0; 7668 7669 if (data) 7670 khz = freq->new; 7671 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 7672 khz = cpufreq_quick_get(raw_smp_processor_id()); 7673 if (!khz) 7674 khz = tsc_khz; 7675 __this_cpu_write(cpu_tsc_khz, khz); 7676 } 7677 7678 #ifdef CONFIG_X86_64 7679 static void kvm_hyperv_tsc_notifier(void) 7680 { 7681 struct kvm *kvm; 7682 struct kvm_vcpu *vcpu; 7683 int cpu; 7684 7685 mutex_lock(&kvm_lock); 7686 list_for_each_entry(kvm, &vm_list, vm_list) 7687 kvm_make_mclock_inprogress_request(kvm); 7688 7689 hyperv_stop_tsc_emulation(); 7690 7691 /* TSC frequency always matches when on Hyper-V */ 7692 for_each_present_cpu(cpu) 7693 per_cpu(cpu_tsc_khz, cpu) = tsc_khz; 7694 kvm_max_guest_tsc_khz = tsc_khz; 7695 7696 list_for_each_entry(kvm, &vm_list, vm_list) { 7697 struct kvm_arch *ka = &kvm->arch; 7698 7699 spin_lock(&ka->pvclock_gtod_sync_lock); 7700 7701 pvclock_update_vm_gtod_copy(kvm); 7702 7703 kvm_for_each_vcpu(cpu, vcpu, kvm) 7704 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7705 7706 kvm_for_each_vcpu(cpu, vcpu, kvm) 7707 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 7708 7709 spin_unlock(&ka->pvclock_gtod_sync_lock); 7710 } 7711 mutex_unlock(&kvm_lock); 7712 } 7713 #endif 7714 7715 static void __kvmclock_cpufreq_notifier(struct cpufreq_freqs *freq, int cpu) 7716 { 7717 struct kvm *kvm; 7718 struct kvm_vcpu *vcpu; 7719 int i, send_ipi = 0; 7720 7721 /* 7722 * We allow guests to temporarily run on slowing clocks, 7723 * provided we notify them after, or to run on accelerating 7724 * clocks, provided we notify them before. Thus time never 7725 * goes backwards. 7726 * 7727 * However, we have a problem. We can't atomically update 7728 * the frequency of a given CPU from this function; it is 7729 * merely a notifier, which can be called from any CPU. 7730 * Changing the TSC frequency at arbitrary points in time 7731 * requires a recomputation of local variables related to 7732 * the TSC for each VCPU. We must flag these local variables 7733 * to be updated and be sure the update takes place with the 7734 * new frequency before any guests proceed. 7735 * 7736 * Unfortunately, the combination of hotplug CPU and frequency 7737 * change creates an intractable locking scenario; the order 7738 * of when these callouts happen is undefined with respect to 7739 * CPU hotplug, and they can race with each other. As such, 7740 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is 7741 * undefined; you can actually have a CPU frequency change take 7742 * place in between the computation of X and the setting of the 7743 * variable. To protect against this problem, all updates of 7744 * the per_cpu tsc_khz variable are done in an interrupt 7745 * protected IPI, and all callers wishing to update the value 7746 * must wait for a synchronous IPI to complete (which is trivial 7747 * if the caller is on the CPU already). This establishes the 7748 * necessary total order on variable updates. 7749 * 7750 * Note that because a guest time update may take place 7751 * anytime after the setting of the VCPU's request bit, the 7752 * correct TSC value must be set before the request. However, 7753 * to ensure the update actually makes it to any guest which 7754 * starts running in hardware virtualization between the set 7755 * and the acquisition of the spinlock, we must also ping the 7756 * CPU after setting the request bit. 7757 * 7758 */ 7759 7760 smp_call_function_single(cpu, tsc_khz_changed, freq, 1); 7761 7762 mutex_lock(&kvm_lock); 7763 list_for_each_entry(kvm, &vm_list, vm_list) { 7764 kvm_for_each_vcpu(i, vcpu, kvm) { 7765 if (vcpu->cpu != cpu) 7766 continue; 7767 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7768 if (vcpu->cpu != raw_smp_processor_id()) 7769 send_ipi = 1; 7770 } 7771 } 7772 mutex_unlock(&kvm_lock); 7773 7774 if (freq->old < freq->new && send_ipi) { 7775 /* 7776 * We upscale the frequency. Must make the guest 7777 * doesn't see old kvmclock values while running with 7778 * the new frequency, otherwise we risk the guest sees 7779 * time go backwards. 7780 * 7781 * In case we update the frequency for another cpu 7782 * (which might be in guest context) send an interrupt 7783 * to kick the cpu out of guest context. Next time 7784 * guest context is entered kvmclock will be updated, 7785 * so the guest will not see stale values. 7786 */ 7787 smp_call_function_single(cpu, tsc_khz_changed, freq, 1); 7788 } 7789 } 7790 7791 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 7792 void *data) 7793 { 7794 struct cpufreq_freqs *freq = data; 7795 int cpu; 7796 7797 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) 7798 return 0; 7799 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) 7800 return 0; 7801 7802 for_each_cpu(cpu, freq->policy->cpus) 7803 __kvmclock_cpufreq_notifier(freq, cpu); 7804 7805 return 0; 7806 } 7807 7808 static struct notifier_block kvmclock_cpufreq_notifier_block = { 7809 .notifier_call = kvmclock_cpufreq_notifier 7810 }; 7811 7812 static int kvmclock_cpu_online(unsigned int cpu) 7813 { 7814 tsc_khz_changed(NULL); 7815 return 0; 7816 } 7817 7818 static void kvm_timer_init(void) 7819 { 7820 max_tsc_khz = tsc_khz; 7821 7822 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { 7823 #ifdef CONFIG_CPU_FREQ 7824 struct cpufreq_policy *policy; 7825 int cpu; 7826 7827 cpu = get_cpu(); 7828 policy = cpufreq_cpu_get(cpu); 7829 if (policy) { 7830 if (policy->cpuinfo.max_freq) 7831 max_tsc_khz = policy->cpuinfo.max_freq; 7832 cpufreq_cpu_put(policy); 7833 } 7834 put_cpu(); 7835 #endif 7836 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, 7837 CPUFREQ_TRANSITION_NOTIFIER); 7838 } 7839 7840 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", 7841 kvmclock_cpu_online, kvmclock_cpu_down_prep); 7842 } 7843 7844 DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); 7845 EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu); 7846 7847 int kvm_is_in_guest(void) 7848 { 7849 return __this_cpu_read(current_vcpu) != NULL; 7850 } 7851 7852 static int kvm_is_user_mode(void) 7853 { 7854 int user_mode = 3; 7855 7856 if (__this_cpu_read(current_vcpu)) 7857 user_mode = static_call(kvm_x86_get_cpl)(__this_cpu_read(current_vcpu)); 7858 7859 return user_mode != 0; 7860 } 7861 7862 static unsigned long kvm_get_guest_ip(void) 7863 { 7864 unsigned long ip = 0; 7865 7866 if (__this_cpu_read(current_vcpu)) 7867 ip = kvm_rip_read(__this_cpu_read(current_vcpu)); 7868 7869 return ip; 7870 } 7871 7872 static void kvm_handle_intel_pt_intr(void) 7873 { 7874 struct kvm_vcpu *vcpu = __this_cpu_read(current_vcpu); 7875 7876 kvm_make_request(KVM_REQ_PMI, vcpu); 7877 __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT, 7878 (unsigned long *)&vcpu->arch.pmu.global_status); 7879 } 7880 7881 static struct perf_guest_info_callbacks kvm_guest_cbs = { 7882 .is_in_guest = kvm_is_in_guest, 7883 .is_user_mode = kvm_is_user_mode, 7884 .get_guest_ip = kvm_get_guest_ip, 7885 .handle_intel_pt_intr = kvm_handle_intel_pt_intr, 7886 }; 7887 7888 #ifdef CONFIG_X86_64 7889 static void pvclock_gtod_update_fn(struct work_struct *work) 7890 { 7891 struct kvm *kvm; 7892 7893 struct kvm_vcpu *vcpu; 7894 int i; 7895 7896 mutex_lock(&kvm_lock); 7897 list_for_each_entry(kvm, &vm_list, vm_list) 7898 kvm_for_each_vcpu(i, vcpu, kvm) 7899 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 7900 atomic_set(&kvm_guest_has_master_clock, 0); 7901 mutex_unlock(&kvm_lock); 7902 } 7903 7904 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn); 7905 7906 /* 7907 * Notification about pvclock gtod data update. 7908 */ 7909 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused, 7910 void *priv) 7911 { 7912 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 7913 struct timekeeper *tk = priv; 7914 7915 update_pvclock_gtod(tk); 7916 7917 /* disable master clock if host does not trust, or does not 7918 * use, TSC based clocksource. 7919 */ 7920 if (!gtod_is_based_on_tsc(gtod->clock.vclock_mode) && 7921 atomic_read(&kvm_guest_has_master_clock) != 0) 7922 queue_work(system_long_wq, &pvclock_gtod_work); 7923 7924 return 0; 7925 } 7926 7927 static struct notifier_block pvclock_gtod_notifier = { 7928 .notifier_call = pvclock_gtod_notify, 7929 }; 7930 #endif 7931 7932 int kvm_arch_init(void *opaque) 7933 { 7934 struct kvm_x86_init_ops *ops = opaque; 7935 int r; 7936 7937 if (kvm_x86_ops.hardware_enable) { 7938 printk(KERN_ERR "kvm: already loaded the other module\n"); 7939 r = -EEXIST; 7940 goto out; 7941 } 7942 7943 if (!ops->cpu_has_kvm_support()) { 7944 pr_err_ratelimited("kvm: no hardware support\n"); 7945 r = -EOPNOTSUPP; 7946 goto out; 7947 } 7948 if (ops->disabled_by_bios()) { 7949 pr_err_ratelimited("kvm: disabled by bios\n"); 7950 r = -EOPNOTSUPP; 7951 goto out; 7952 } 7953 7954 /* 7955 * KVM explicitly assumes that the guest has an FPU and 7956 * FXSAVE/FXRSTOR. For example, the KVM_GET_FPU explicitly casts the 7957 * vCPU's FPU state as a fxregs_state struct. 7958 */ 7959 if (!boot_cpu_has(X86_FEATURE_FPU) || !boot_cpu_has(X86_FEATURE_FXSR)) { 7960 printk(KERN_ERR "kvm: inadequate fpu\n"); 7961 r = -EOPNOTSUPP; 7962 goto out; 7963 } 7964 7965 r = -ENOMEM; 7966 x86_fpu_cache = kmem_cache_create("x86_fpu", sizeof(struct fpu), 7967 __alignof__(struct fpu), SLAB_ACCOUNT, 7968 NULL); 7969 if (!x86_fpu_cache) { 7970 printk(KERN_ERR "kvm: failed to allocate cache for x86 fpu\n"); 7971 goto out; 7972 } 7973 7974 x86_emulator_cache = kvm_alloc_emulator_cache(); 7975 if (!x86_emulator_cache) { 7976 pr_err("kvm: failed to allocate cache for x86 emulator\n"); 7977 goto out_free_x86_fpu_cache; 7978 } 7979 7980 user_return_msrs = alloc_percpu(struct kvm_user_return_msrs); 7981 if (!user_return_msrs) { 7982 printk(KERN_ERR "kvm: failed to allocate percpu kvm_user_return_msrs\n"); 7983 goto out_free_x86_emulator_cache; 7984 } 7985 7986 r = kvm_mmu_module_init(); 7987 if (r) 7988 goto out_free_percpu; 7989 7990 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, 7991 PT_DIRTY_MASK, PT64_NX_MASK, 0, 7992 PT_PRESENT_MASK, 0, sme_me_mask); 7993 kvm_timer_init(); 7994 7995 perf_register_guest_info_callbacks(&kvm_guest_cbs); 7996 7997 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 7998 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); 7999 supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0; 8000 } 8001 8002 if (pi_inject_timer == -1) 8003 pi_inject_timer = housekeeping_enabled(HK_FLAG_TIMER); 8004 #ifdef CONFIG_X86_64 8005 pvclock_gtod_register_notifier(&pvclock_gtod_notifier); 8006 8007 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 8008 set_hv_tscchange_cb(kvm_hyperv_tsc_notifier); 8009 #endif 8010 8011 return 0; 8012 8013 out_free_percpu: 8014 free_percpu(user_return_msrs); 8015 out_free_x86_emulator_cache: 8016 kmem_cache_destroy(x86_emulator_cache); 8017 out_free_x86_fpu_cache: 8018 kmem_cache_destroy(x86_fpu_cache); 8019 out: 8020 return r; 8021 } 8022 8023 void kvm_arch_exit(void) 8024 { 8025 #ifdef CONFIG_X86_64 8026 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 8027 clear_hv_tscchange_cb(); 8028 #endif 8029 kvm_lapic_exit(); 8030 perf_unregister_guest_info_callbacks(&kvm_guest_cbs); 8031 8032 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 8033 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, 8034 CPUFREQ_TRANSITION_NOTIFIER); 8035 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); 8036 #ifdef CONFIG_X86_64 8037 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); 8038 #endif 8039 kvm_x86_ops.hardware_enable = NULL; 8040 kvm_mmu_module_exit(); 8041 free_percpu(user_return_msrs); 8042 kmem_cache_destroy(x86_fpu_cache); 8043 WARN_ON(static_branch_unlikely(&kvm_xen_enabled.key)); 8044 } 8045 8046 static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) 8047 { 8048 ++vcpu->stat.halt_exits; 8049 if (lapic_in_kernel(vcpu)) { 8050 vcpu->arch.mp_state = state; 8051 return 1; 8052 } else { 8053 vcpu->run->exit_reason = reason; 8054 return 0; 8055 } 8056 } 8057 8058 int kvm_vcpu_halt(struct kvm_vcpu *vcpu) 8059 { 8060 return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); 8061 } 8062 EXPORT_SYMBOL_GPL(kvm_vcpu_halt); 8063 8064 int kvm_emulate_halt(struct kvm_vcpu *vcpu) 8065 { 8066 int ret = kvm_skip_emulated_instruction(vcpu); 8067 /* 8068 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered 8069 * KVM_EXIT_DEBUG here. 8070 */ 8071 return kvm_vcpu_halt(vcpu) && ret; 8072 } 8073 EXPORT_SYMBOL_GPL(kvm_emulate_halt); 8074 8075 int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu) 8076 { 8077 int ret = kvm_skip_emulated_instruction(vcpu); 8078 8079 return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, KVM_EXIT_AP_RESET_HOLD) && ret; 8080 } 8081 EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold); 8082 8083 #ifdef CONFIG_X86_64 8084 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr, 8085 unsigned long clock_type) 8086 { 8087 struct kvm_clock_pairing clock_pairing; 8088 struct timespec64 ts; 8089 u64 cycle; 8090 int ret; 8091 8092 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK) 8093 return -KVM_EOPNOTSUPP; 8094 8095 if (!kvm_get_walltime_and_clockread(&ts, &cycle)) 8096 return -KVM_EOPNOTSUPP; 8097 8098 clock_pairing.sec = ts.tv_sec; 8099 clock_pairing.nsec = ts.tv_nsec; 8100 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle); 8101 clock_pairing.flags = 0; 8102 memset(&clock_pairing.pad, 0, sizeof(clock_pairing.pad)); 8103 8104 ret = 0; 8105 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing, 8106 sizeof(struct kvm_clock_pairing))) 8107 ret = -KVM_EFAULT; 8108 8109 return ret; 8110 } 8111 #endif 8112 8113 /* 8114 * kvm_pv_kick_cpu_op: Kick a vcpu. 8115 * 8116 * @apicid - apicid of vcpu to be kicked. 8117 */ 8118 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) 8119 { 8120 struct kvm_lapic_irq lapic_irq; 8121 8122 lapic_irq.shorthand = APIC_DEST_NOSHORT; 8123 lapic_irq.dest_mode = APIC_DEST_PHYSICAL; 8124 lapic_irq.level = 0; 8125 lapic_irq.dest_id = apicid; 8126 lapic_irq.msi_redir_hint = false; 8127 8128 lapic_irq.delivery_mode = APIC_DM_REMRD; 8129 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); 8130 } 8131 8132 bool kvm_apicv_activated(struct kvm *kvm) 8133 { 8134 return (READ_ONCE(kvm->arch.apicv_inhibit_reasons) == 0); 8135 } 8136 EXPORT_SYMBOL_GPL(kvm_apicv_activated); 8137 8138 void kvm_apicv_init(struct kvm *kvm, bool enable) 8139 { 8140 if (enable) 8141 clear_bit(APICV_INHIBIT_REASON_DISABLE, 8142 &kvm->arch.apicv_inhibit_reasons); 8143 else 8144 set_bit(APICV_INHIBIT_REASON_DISABLE, 8145 &kvm->arch.apicv_inhibit_reasons); 8146 } 8147 EXPORT_SYMBOL_GPL(kvm_apicv_init); 8148 8149 static void kvm_sched_yield(struct kvm *kvm, unsigned long dest_id) 8150 { 8151 struct kvm_vcpu *target = NULL; 8152 struct kvm_apic_map *map; 8153 8154 rcu_read_lock(); 8155 map = rcu_dereference(kvm->arch.apic_map); 8156 8157 if (likely(map) && dest_id <= map->max_apic_id && map->phys_map[dest_id]) 8158 target = map->phys_map[dest_id]->vcpu; 8159 8160 rcu_read_unlock(); 8161 8162 if (target && READ_ONCE(target->ready)) 8163 kvm_vcpu_yield_to(target); 8164 } 8165 8166 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) 8167 { 8168 unsigned long nr, a0, a1, a2, a3, ret; 8169 int op_64_bit; 8170 8171 if (kvm_xen_hypercall_enabled(vcpu->kvm)) 8172 return kvm_xen_hypercall(vcpu); 8173 8174 if (kvm_hv_hypercall_enabled(vcpu)) 8175 return kvm_hv_hypercall(vcpu); 8176 8177 nr = kvm_rax_read(vcpu); 8178 a0 = kvm_rbx_read(vcpu); 8179 a1 = kvm_rcx_read(vcpu); 8180 a2 = kvm_rdx_read(vcpu); 8181 a3 = kvm_rsi_read(vcpu); 8182 8183 trace_kvm_hypercall(nr, a0, a1, a2, a3); 8184 8185 op_64_bit = is_64_bit_mode(vcpu); 8186 if (!op_64_bit) { 8187 nr &= 0xFFFFFFFF; 8188 a0 &= 0xFFFFFFFF; 8189 a1 &= 0xFFFFFFFF; 8190 a2 &= 0xFFFFFFFF; 8191 a3 &= 0xFFFFFFFF; 8192 } 8193 8194 if (static_call(kvm_x86_get_cpl)(vcpu) != 0) { 8195 ret = -KVM_EPERM; 8196 goto out; 8197 } 8198 8199 ret = -KVM_ENOSYS; 8200 8201 switch (nr) { 8202 case KVM_HC_VAPIC_POLL_IRQ: 8203 ret = 0; 8204 break; 8205 case KVM_HC_KICK_CPU: 8206 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_UNHALT)) 8207 break; 8208 8209 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1); 8210 kvm_sched_yield(vcpu->kvm, a1); 8211 ret = 0; 8212 break; 8213 #ifdef CONFIG_X86_64 8214 case KVM_HC_CLOCK_PAIRING: 8215 ret = kvm_pv_clock_pairing(vcpu, a0, a1); 8216 break; 8217 #endif 8218 case KVM_HC_SEND_IPI: 8219 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SEND_IPI)) 8220 break; 8221 8222 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit); 8223 break; 8224 case KVM_HC_SCHED_YIELD: 8225 if (!guest_pv_has(vcpu, KVM_FEATURE_PV_SCHED_YIELD)) 8226 break; 8227 8228 kvm_sched_yield(vcpu->kvm, a0); 8229 ret = 0; 8230 break; 8231 default: 8232 ret = -KVM_ENOSYS; 8233 break; 8234 } 8235 out: 8236 if (!op_64_bit) 8237 ret = (u32)ret; 8238 kvm_rax_write(vcpu, ret); 8239 8240 ++vcpu->stat.hypercalls; 8241 return kvm_skip_emulated_instruction(vcpu); 8242 } 8243 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); 8244 8245 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) 8246 { 8247 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 8248 char instruction[3]; 8249 unsigned long rip = kvm_rip_read(vcpu); 8250 8251 static_call(kvm_x86_patch_hypercall)(vcpu, instruction); 8252 8253 return emulator_write_emulated(ctxt, rip, instruction, 3, 8254 &ctxt->exception); 8255 } 8256 8257 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) 8258 { 8259 return vcpu->run->request_interrupt_window && 8260 likely(!pic_in_kernel(vcpu->kvm)); 8261 } 8262 8263 static void post_kvm_run_save(struct kvm_vcpu *vcpu) 8264 { 8265 struct kvm_run *kvm_run = vcpu->run; 8266 8267 /* 8268 * if_flag is obsolete and useless, so do not bother 8269 * setting it for SEV-ES guests. Userspace can just 8270 * use kvm_run->ready_for_interrupt_injection. 8271 */ 8272 kvm_run->if_flag = !vcpu->arch.guest_state_protected 8273 && (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; 8274 8275 kvm_run->cr8 = kvm_get_cr8(vcpu); 8276 kvm_run->apic_base = kvm_get_apic_base(vcpu); 8277 kvm_run->ready_for_interrupt_injection = 8278 pic_in_kernel(vcpu->kvm) || 8279 kvm_vcpu_ready_for_interrupt_injection(vcpu); 8280 8281 if (is_smm(vcpu)) 8282 kvm_run->flags |= KVM_RUN_X86_SMM; 8283 } 8284 8285 static void update_cr8_intercept(struct kvm_vcpu *vcpu) 8286 { 8287 int max_irr, tpr; 8288 8289 if (!kvm_x86_ops.update_cr8_intercept) 8290 return; 8291 8292 if (!lapic_in_kernel(vcpu)) 8293 return; 8294 8295 if (vcpu->arch.apicv_active) 8296 return; 8297 8298 if (!vcpu->arch.apic->vapic_addr) 8299 max_irr = kvm_lapic_find_highest_irr(vcpu); 8300 else 8301 max_irr = -1; 8302 8303 if (max_irr != -1) 8304 max_irr >>= 4; 8305 8306 tpr = kvm_lapic_get_cr8(vcpu); 8307 8308 static_call(kvm_x86_update_cr8_intercept)(vcpu, tpr, max_irr); 8309 } 8310 8311 static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit) 8312 { 8313 int r; 8314 bool can_inject = true; 8315 8316 /* try to reinject previous events if any */ 8317 8318 if (vcpu->arch.exception.injected) { 8319 static_call(kvm_x86_queue_exception)(vcpu); 8320 can_inject = false; 8321 } 8322 /* 8323 * Do not inject an NMI or interrupt if there is a pending 8324 * exception. Exceptions and interrupts are recognized at 8325 * instruction boundaries, i.e. the start of an instruction. 8326 * Trap-like exceptions, e.g. #DB, have higher priority than 8327 * NMIs and interrupts, i.e. traps are recognized before an 8328 * NMI/interrupt that's pending on the same instruction. 8329 * Fault-like exceptions, e.g. #GP and #PF, are the lowest 8330 * priority, but are only generated (pended) during instruction 8331 * execution, i.e. a pending fault-like exception means the 8332 * fault occurred on the *previous* instruction and must be 8333 * serviced prior to recognizing any new events in order to 8334 * fully complete the previous instruction. 8335 */ 8336 else if (!vcpu->arch.exception.pending) { 8337 if (vcpu->arch.nmi_injected) { 8338 static_call(kvm_x86_set_nmi)(vcpu); 8339 can_inject = false; 8340 } else if (vcpu->arch.interrupt.injected) { 8341 static_call(kvm_x86_set_irq)(vcpu); 8342 can_inject = false; 8343 } 8344 } 8345 8346 WARN_ON_ONCE(vcpu->arch.exception.injected && 8347 vcpu->arch.exception.pending); 8348 8349 /* 8350 * Call check_nested_events() even if we reinjected a previous event 8351 * in order for caller to determine if it should require immediate-exit 8352 * from L2 to L1 due to pending L1 events which require exit 8353 * from L2 to L1. 8354 */ 8355 if (is_guest_mode(vcpu)) { 8356 r = kvm_x86_ops.nested_ops->check_events(vcpu); 8357 if (r < 0) 8358 goto busy; 8359 } 8360 8361 /* try to inject new event if pending */ 8362 if (vcpu->arch.exception.pending) { 8363 trace_kvm_inj_exception(vcpu->arch.exception.nr, 8364 vcpu->arch.exception.has_error_code, 8365 vcpu->arch.exception.error_code); 8366 8367 vcpu->arch.exception.pending = false; 8368 vcpu->arch.exception.injected = true; 8369 8370 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT) 8371 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) | 8372 X86_EFLAGS_RF); 8373 8374 if (vcpu->arch.exception.nr == DB_VECTOR) { 8375 kvm_deliver_exception_payload(vcpu); 8376 if (vcpu->arch.dr7 & DR7_GD) { 8377 vcpu->arch.dr7 &= ~DR7_GD; 8378 kvm_update_dr7(vcpu); 8379 } 8380 } 8381 8382 static_call(kvm_x86_queue_exception)(vcpu); 8383 can_inject = false; 8384 } 8385 8386 /* 8387 * Finally, inject interrupt events. If an event cannot be injected 8388 * due to architectural conditions (e.g. IF=0) a window-open exit 8389 * will re-request KVM_REQ_EVENT. Sometimes however an event is pending 8390 * and can architecturally be injected, but we cannot do it right now: 8391 * an interrupt could have arrived just now and we have to inject it 8392 * as a vmexit, or there could already an event in the queue, which is 8393 * indicated by can_inject. In that case we request an immediate exit 8394 * in order to make progress and get back here for another iteration. 8395 * The kvm_x86_ops hooks communicate this by returning -EBUSY. 8396 */ 8397 if (vcpu->arch.smi_pending) { 8398 r = can_inject ? static_call(kvm_x86_smi_allowed)(vcpu, true) : -EBUSY; 8399 if (r < 0) 8400 goto busy; 8401 if (r) { 8402 vcpu->arch.smi_pending = false; 8403 ++vcpu->arch.smi_count; 8404 enter_smm(vcpu); 8405 can_inject = false; 8406 } else 8407 static_call(kvm_x86_enable_smi_window)(vcpu); 8408 } 8409 8410 if (vcpu->arch.nmi_pending) { 8411 r = can_inject ? static_call(kvm_x86_nmi_allowed)(vcpu, true) : -EBUSY; 8412 if (r < 0) 8413 goto busy; 8414 if (r) { 8415 --vcpu->arch.nmi_pending; 8416 vcpu->arch.nmi_injected = true; 8417 static_call(kvm_x86_set_nmi)(vcpu); 8418 can_inject = false; 8419 WARN_ON(static_call(kvm_x86_nmi_allowed)(vcpu, true) < 0); 8420 } 8421 if (vcpu->arch.nmi_pending) 8422 static_call(kvm_x86_enable_nmi_window)(vcpu); 8423 } 8424 8425 if (kvm_cpu_has_injectable_intr(vcpu)) { 8426 r = can_inject ? static_call(kvm_x86_interrupt_allowed)(vcpu, true) : -EBUSY; 8427 if (r < 0) 8428 goto busy; 8429 if (r) { 8430 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), false); 8431 static_call(kvm_x86_set_irq)(vcpu); 8432 WARN_ON(static_call(kvm_x86_interrupt_allowed)(vcpu, true) < 0); 8433 } 8434 if (kvm_cpu_has_injectable_intr(vcpu)) 8435 static_call(kvm_x86_enable_irq_window)(vcpu); 8436 } 8437 8438 if (is_guest_mode(vcpu) && 8439 kvm_x86_ops.nested_ops->hv_timer_pending && 8440 kvm_x86_ops.nested_ops->hv_timer_pending(vcpu)) 8441 *req_immediate_exit = true; 8442 8443 WARN_ON(vcpu->arch.exception.pending); 8444 return; 8445 8446 busy: 8447 *req_immediate_exit = true; 8448 return; 8449 } 8450 8451 static void process_nmi(struct kvm_vcpu *vcpu) 8452 { 8453 unsigned limit = 2; 8454 8455 /* 8456 * x86 is limited to one NMI running, and one NMI pending after it. 8457 * If an NMI is already in progress, limit further NMIs to just one. 8458 * Otherwise, allow two (and we'll inject the first one immediately). 8459 */ 8460 if (static_call(kvm_x86_get_nmi_mask)(vcpu) || vcpu->arch.nmi_injected) 8461 limit = 1; 8462 8463 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0); 8464 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit); 8465 kvm_make_request(KVM_REQ_EVENT, vcpu); 8466 } 8467 8468 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) 8469 { 8470 u32 flags = 0; 8471 flags |= seg->g << 23; 8472 flags |= seg->db << 22; 8473 flags |= seg->l << 21; 8474 flags |= seg->avl << 20; 8475 flags |= seg->present << 15; 8476 flags |= seg->dpl << 13; 8477 flags |= seg->s << 12; 8478 flags |= seg->type << 8; 8479 return flags; 8480 } 8481 8482 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n) 8483 { 8484 struct kvm_segment seg; 8485 int offset; 8486 8487 kvm_get_segment(vcpu, &seg, n); 8488 put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector); 8489 8490 if (n < 3) 8491 offset = 0x7f84 + n * 12; 8492 else 8493 offset = 0x7f2c + (n - 3) * 12; 8494 8495 put_smstate(u32, buf, offset + 8, seg.base); 8496 put_smstate(u32, buf, offset + 4, seg.limit); 8497 put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg)); 8498 } 8499 8500 #ifdef CONFIG_X86_64 8501 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n) 8502 { 8503 struct kvm_segment seg; 8504 int offset; 8505 u16 flags; 8506 8507 kvm_get_segment(vcpu, &seg, n); 8508 offset = 0x7e00 + n * 16; 8509 8510 flags = enter_smm_get_segment_flags(&seg) >> 8; 8511 put_smstate(u16, buf, offset, seg.selector); 8512 put_smstate(u16, buf, offset + 2, flags); 8513 put_smstate(u32, buf, offset + 4, seg.limit); 8514 put_smstate(u64, buf, offset + 8, seg.base); 8515 } 8516 #endif 8517 8518 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf) 8519 { 8520 struct desc_ptr dt; 8521 struct kvm_segment seg; 8522 unsigned long val; 8523 int i; 8524 8525 put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu)); 8526 put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu)); 8527 put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu)); 8528 put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu)); 8529 8530 for (i = 0; i < 8; i++) 8531 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read(vcpu, i)); 8532 8533 kvm_get_dr(vcpu, 6, &val); 8534 put_smstate(u32, buf, 0x7fcc, (u32)val); 8535 kvm_get_dr(vcpu, 7, &val); 8536 put_smstate(u32, buf, 0x7fc8, (u32)val); 8537 8538 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 8539 put_smstate(u32, buf, 0x7fc4, seg.selector); 8540 put_smstate(u32, buf, 0x7f64, seg.base); 8541 put_smstate(u32, buf, 0x7f60, seg.limit); 8542 put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg)); 8543 8544 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 8545 put_smstate(u32, buf, 0x7fc0, seg.selector); 8546 put_smstate(u32, buf, 0x7f80, seg.base); 8547 put_smstate(u32, buf, 0x7f7c, seg.limit); 8548 put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg)); 8549 8550 static_call(kvm_x86_get_gdt)(vcpu, &dt); 8551 put_smstate(u32, buf, 0x7f74, dt.address); 8552 put_smstate(u32, buf, 0x7f70, dt.size); 8553 8554 static_call(kvm_x86_get_idt)(vcpu, &dt); 8555 put_smstate(u32, buf, 0x7f58, dt.address); 8556 put_smstate(u32, buf, 0x7f54, dt.size); 8557 8558 for (i = 0; i < 6; i++) 8559 enter_smm_save_seg_32(vcpu, buf, i); 8560 8561 put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu)); 8562 8563 /* revision id */ 8564 put_smstate(u32, buf, 0x7efc, 0x00020000); 8565 put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase); 8566 } 8567 8568 #ifdef CONFIG_X86_64 8569 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) 8570 { 8571 struct desc_ptr dt; 8572 struct kvm_segment seg; 8573 unsigned long val; 8574 int i; 8575 8576 for (i = 0; i < 16; i++) 8577 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read(vcpu, i)); 8578 8579 put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu)); 8580 put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu)); 8581 8582 kvm_get_dr(vcpu, 6, &val); 8583 put_smstate(u64, buf, 0x7f68, val); 8584 kvm_get_dr(vcpu, 7, &val); 8585 put_smstate(u64, buf, 0x7f60, val); 8586 8587 put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu)); 8588 put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu)); 8589 put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu)); 8590 8591 put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase); 8592 8593 /* revision id */ 8594 put_smstate(u32, buf, 0x7efc, 0x00020064); 8595 8596 put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer); 8597 8598 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 8599 put_smstate(u16, buf, 0x7e90, seg.selector); 8600 put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8); 8601 put_smstate(u32, buf, 0x7e94, seg.limit); 8602 put_smstate(u64, buf, 0x7e98, seg.base); 8603 8604 static_call(kvm_x86_get_idt)(vcpu, &dt); 8605 put_smstate(u32, buf, 0x7e84, dt.size); 8606 put_smstate(u64, buf, 0x7e88, dt.address); 8607 8608 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 8609 put_smstate(u16, buf, 0x7e70, seg.selector); 8610 put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8); 8611 put_smstate(u32, buf, 0x7e74, seg.limit); 8612 put_smstate(u64, buf, 0x7e78, seg.base); 8613 8614 static_call(kvm_x86_get_gdt)(vcpu, &dt); 8615 put_smstate(u32, buf, 0x7e64, dt.size); 8616 put_smstate(u64, buf, 0x7e68, dt.address); 8617 8618 for (i = 0; i < 6; i++) 8619 enter_smm_save_seg_64(vcpu, buf, i); 8620 } 8621 #endif 8622 8623 static void enter_smm(struct kvm_vcpu *vcpu) 8624 { 8625 struct kvm_segment cs, ds; 8626 struct desc_ptr dt; 8627 char buf[512]; 8628 u32 cr0; 8629 8630 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true); 8631 memset(buf, 0, 512); 8632 #ifdef CONFIG_X86_64 8633 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 8634 enter_smm_save_state_64(vcpu, buf); 8635 else 8636 #endif 8637 enter_smm_save_state_32(vcpu, buf); 8638 8639 /* 8640 * Give pre_enter_smm() a chance to make ISA-specific changes to the 8641 * vCPU state (e.g. leave guest mode) after we've saved the state into 8642 * the SMM state-save area. 8643 */ 8644 static_call(kvm_x86_pre_enter_smm)(vcpu, buf); 8645 8646 vcpu->arch.hflags |= HF_SMM_MASK; 8647 kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); 8648 8649 if (static_call(kvm_x86_get_nmi_mask)(vcpu)) 8650 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 8651 else 8652 static_call(kvm_x86_set_nmi_mask)(vcpu, true); 8653 8654 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); 8655 kvm_rip_write(vcpu, 0x8000); 8656 8657 cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); 8658 static_call(kvm_x86_set_cr0)(vcpu, cr0); 8659 vcpu->arch.cr0 = cr0; 8660 8661 static_call(kvm_x86_set_cr4)(vcpu, 0); 8662 8663 /* Undocumented: IDT limit is set to zero on entry to SMM. */ 8664 dt.address = dt.size = 0; 8665 static_call(kvm_x86_set_idt)(vcpu, &dt); 8666 8667 kvm_set_dr(vcpu, 7, DR7_FIXED_1); 8668 8669 cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; 8670 cs.base = vcpu->arch.smbase; 8671 8672 ds.selector = 0; 8673 ds.base = 0; 8674 8675 cs.limit = ds.limit = 0xffffffff; 8676 cs.type = ds.type = 0x3; 8677 cs.dpl = ds.dpl = 0; 8678 cs.db = ds.db = 0; 8679 cs.s = ds.s = 1; 8680 cs.l = ds.l = 0; 8681 cs.g = ds.g = 1; 8682 cs.avl = ds.avl = 0; 8683 cs.present = ds.present = 1; 8684 cs.unusable = ds.unusable = 0; 8685 cs.padding = ds.padding = 0; 8686 8687 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 8688 kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); 8689 kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); 8690 kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); 8691 kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); 8692 kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); 8693 8694 #ifdef CONFIG_X86_64 8695 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 8696 static_call(kvm_x86_set_efer)(vcpu, 0); 8697 #endif 8698 8699 kvm_update_cpuid_runtime(vcpu); 8700 kvm_mmu_reset_context(vcpu); 8701 } 8702 8703 static void process_smi(struct kvm_vcpu *vcpu) 8704 { 8705 vcpu->arch.smi_pending = true; 8706 kvm_make_request(KVM_REQ_EVENT, vcpu); 8707 } 8708 8709 void kvm_make_scan_ioapic_request_mask(struct kvm *kvm, 8710 unsigned long *vcpu_bitmap) 8711 { 8712 cpumask_var_t cpus; 8713 8714 zalloc_cpumask_var(&cpus, GFP_ATOMIC); 8715 8716 kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC, 8717 NULL, vcpu_bitmap, cpus); 8718 8719 free_cpumask_var(cpus); 8720 } 8721 8722 void kvm_make_scan_ioapic_request(struct kvm *kvm) 8723 { 8724 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); 8725 } 8726 8727 void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu) 8728 { 8729 if (!lapic_in_kernel(vcpu)) 8730 return; 8731 8732 vcpu->arch.apicv_active = kvm_apicv_activated(vcpu->kvm); 8733 kvm_apic_update_apicv(vcpu); 8734 static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu); 8735 } 8736 EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv); 8737 8738 /* 8739 * NOTE: Do not hold any lock prior to calling this. 8740 * 8741 * In particular, kvm_request_apicv_update() expects kvm->srcu not to be 8742 * locked, because it calls __x86_set_memory_region() which does 8743 * synchronize_srcu(&kvm->srcu). 8744 */ 8745 void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit) 8746 { 8747 struct kvm_vcpu *except; 8748 unsigned long old, new, expected; 8749 8750 if (!kvm_x86_ops.check_apicv_inhibit_reasons || 8751 !static_call(kvm_x86_check_apicv_inhibit_reasons)(bit)) 8752 return; 8753 8754 old = READ_ONCE(kvm->arch.apicv_inhibit_reasons); 8755 do { 8756 expected = new = old; 8757 if (activate) 8758 __clear_bit(bit, &new); 8759 else 8760 __set_bit(bit, &new); 8761 if (new == old) 8762 break; 8763 old = cmpxchg(&kvm->arch.apicv_inhibit_reasons, expected, new); 8764 } while (old != expected); 8765 8766 if (!!old == !!new) 8767 return; 8768 8769 trace_kvm_apicv_update_request(activate, bit); 8770 if (kvm_x86_ops.pre_update_apicv_exec_ctrl) 8771 static_call(kvm_x86_pre_update_apicv_exec_ctrl)(kvm, activate); 8772 8773 /* 8774 * Sending request to update APICV for all other vcpus, 8775 * while update the calling vcpu immediately instead of 8776 * waiting for another #VMEXIT to handle the request. 8777 */ 8778 except = kvm_get_running_vcpu(); 8779 kvm_make_all_cpus_request_except(kvm, KVM_REQ_APICV_UPDATE, 8780 except); 8781 if (except) 8782 kvm_vcpu_update_apicv(except); 8783 } 8784 EXPORT_SYMBOL_GPL(kvm_request_apicv_update); 8785 8786 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu) 8787 { 8788 if (!kvm_apic_present(vcpu)) 8789 return; 8790 8791 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256); 8792 8793 if (irqchip_split(vcpu->kvm)) 8794 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors); 8795 else { 8796 if (vcpu->arch.apicv_active) 8797 static_call(kvm_x86_sync_pir_to_irr)(vcpu); 8798 if (ioapic_in_kernel(vcpu->kvm)) 8799 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors); 8800 } 8801 8802 if (is_guest_mode(vcpu)) 8803 vcpu->arch.load_eoi_exitmap_pending = true; 8804 else 8805 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); 8806 } 8807 8808 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu) 8809 { 8810 u64 eoi_exit_bitmap[4]; 8811 8812 if (!kvm_apic_hw_enabled(vcpu->arch.apic)) 8813 return; 8814 8815 if (to_hv_vcpu(vcpu)) 8816 bitmap_or((ulong *)eoi_exit_bitmap, 8817 vcpu->arch.ioapic_handled_vectors, 8818 to_hv_synic(vcpu)->vec_bitmap, 256); 8819 8820 static_call(kvm_x86_load_eoi_exitmap)(vcpu, eoi_exit_bitmap); 8821 } 8822 8823 void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, 8824 unsigned long start, unsigned long end) 8825 { 8826 unsigned long apic_address; 8827 8828 /* 8829 * The physical address of apic access page is stored in the VMCS. 8830 * Update it when it becomes invalid. 8831 */ 8832 apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 8833 if (start <= apic_address && apic_address < end) 8834 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); 8835 } 8836 8837 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) 8838 { 8839 if (!lapic_in_kernel(vcpu)) 8840 return; 8841 8842 if (!kvm_x86_ops.set_apic_access_page_addr) 8843 return; 8844 8845 static_call(kvm_x86_set_apic_access_page_addr)(vcpu); 8846 } 8847 8848 void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu) 8849 { 8850 smp_send_reschedule(vcpu->cpu); 8851 } 8852 EXPORT_SYMBOL_GPL(__kvm_request_immediate_exit); 8853 8854 /* 8855 * Returns 1 to let vcpu_run() continue the guest execution loop without 8856 * exiting to the userspace. Otherwise, the value will be returned to the 8857 * userspace. 8858 */ 8859 static int vcpu_enter_guest(struct kvm_vcpu *vcpu) 8860 { 8861 int r; 8862 bool req_int_win = 8863 dm_request_for_irq_injection(vcpu) && 8864 kvm_cpu_accept_dm_intr(vcpu); 8865 fastpath_t exit_fastpath; 8866 8867 bool req_immediate_exit = false; 8868 8869 /* Forbid vmenter if vcpu dirty ring is soft-full */ 8870 if (unlikely(vcpu->kvm->dirty_ring_size && 8871 kvm_dirty_ring_soft_full(&vcpu->dirty_ring))) { 8872 vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL; 8873 trace_kvm_dirty_ring_exit(vcpu); 8874 r = 0; 8875 goto out; 8876 } 8877 8878 if (kvm_request_pending(vcpu)) { 8879 if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) { 8880 if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) { 8881 r = 0; 8882 goto out; 8883 } 8884 } 8885 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) 8886 kvm_mmu_unload(vcpu); 8887 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu)) 8888 __kvm_migrate_timers(vcpu); 8889 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu)) 8890 kvm_gen_update_masterclock(vcpu->kvm); 8891 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu)) 8892 kvm_gen_kvmclock_update(vcpu); 8893 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) { 8894 r = kvm_guest_time_update(vcpu); 8895 if (unlikely(r)) 8896 goto out; 8897 } 8898 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) 8899 kvm_mmu_sync_roots(vcpu); 8900 if (kvm_check_request(KVM_REQ_LOAD_MMU_PGD, vcpu)) 8901 kvm_mmu_load_pgd(vcpu); 8902 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 8903 kvm_vcpu_flush_tlb_all(vcpu); 8904 8905 /* Flushing all ASIDs flushes the current ASID... */ 8906 kvm_clear_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 8907 } 8908 if (kvm_check_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu)) 8909 kvm_vcpu_flush_tlb_current(vcpu); 8910 if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu)) 8911 kvm_vcpu_flush_tlb_guest(vcpu); 8912 8913 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { 8914 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; 8915 r = 0; 8916 goto out; 8917 } 8918 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { 8919 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; 8920 vcpu->mmio_needed = 0; 8921 r = 0; 8922 goto out; 8923 } 8924 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { 8925 /* Page is swapped out. Do synthetic halt */ 8926 vcpu->arch.apf.halted = true; 8927 r = 1; 8928 goto out; 8929 } 8930 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) 8931 record_steal_time(vcpu); 8932 if (kvm_check_request(KVM_REQ_SMI, vcpu)) 8933 process_smi(vcpu); 8934 if (kvm_check_request(KVM_REQ_NMI, vcpu)) 8935 process_nmi(vcpu); 8936 if (kvm_check_request(KVM_REQ_PMU, vcpu)) 8937 kvm_pmu_handle_event(vcpu); 8938 if (kvm_check_request(KVM_REQ_PMI, vcpu)) 8939 kvm_pmu_deliver_pmi(vcpu); 8940 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) { 8941 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255); 8942 if (test_bit(vcpu->arch.pending_ioapic_eoi, 8943 vcpu->arch.ioapic_handled_vectors)) { 8944 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI; 8945 vcpu->run->eoi.vector = 8946 vcpu->arch.pending_ioapic_eoi; 8947 r = 0; 8948 goto out; 8949 } 8950 } 8951 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu)) 8952 vcpu_scan_ioapic(vcpu); 8953 if (kvm_check_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu)) 8954 vcpu_load_eoi_exitmap(vcpu); 8955 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu)) 8956 kvm_vcpu_reload_apic_access_page(vcpu); 8957 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) { 8958 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 8959 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH; 8960 r = 0; 8961 goto out; 8962 } 8963 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) { 8964 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 8965 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET; 8966 r = 0; 8967 goto out; 8968 } 8969 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) { 8970 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 8971 8972 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 8973 vcpu->run->hyperv = hv_vcpu->exit; 8974 r = 0; 8975 goto out; 8976 } 8977 8978 /* 8979 * KVM_REQ_HV_STIMER has to be processed after 8980 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers 8981 * depend on the guest clock being up-to-date 8982 */ 8983 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu)) 8984 kvm_hv_process_stimers(vcpu); 8985 if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu)) 8986 kvm_vcpu_update_apicv(vcpu); 8987 if (kvm_check_request(KVM_REQ_APF_READY, vcpu)) 8988 kvm_check_async_pf_completion(vcpu); 8989 if (kvm_check_request(KVM_REQ_MSR_FILTER_CHANGED, vcpu)) 8990 static_call(kvm_x86_msr_filter_changed)(vcpu); 8991 8992 if (kvm_check_request(KVM_REQ_UPDATE_CPU_DIRTY_LOGGING, vcpu)) 8993 static_call(kvm_x86_update_cpu_dirty_logging)(vcpu); 8994 } 8995 8996 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win || 8997 kvm_xen_has_interrupt(vcpu)) { 8998 ++vcpu->stat.req_event; 8999 kvm_apic_accept_events(vcpu); 9000 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { 9001 r = 1; 9002 goto out; 9003 } 9004 9005 inject_pending_event(vcpu, &req_immediate_exit); 9006 if (req_int_win) 9007 static_call(kvm_x86_enable_irq_window)(vcpu); 9008 9009 if (kvm_lapic_enabled(vcpu)) { 9010 update_cr8_intercept(vcpu); 9011 kvm_lapic_sync_to_vapic(vcpu); 9012 } 9013 } 9014 9015 r = kvm_mmu_reload(vcpu); 9016 if (unlikely(r)) { 9017 goto cancel_injection; 9018 } 9019 9020 preempt_disable(); 9021 9022 static_call(kvm_x86_prepare_guest_switch)(vcpu); 9023 9024 /* 9025 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt 9026 * IPI are then delayed after guest entry, which ensures that they 9027 * result in virtual interrupt delivery. 9028 */ 9029 local_irq_disable(); 9030 vcpu->mode = IN_GUEST_MODE; 9031 9032 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 9033 9034 /* 9035 * 1) We should set ->mode before checking ->requests. Please see 9036 * the comment in kvm_vcpu_exiting_guest_mode(). 9037 * 9038 * 2) For APICv, we should set ->mode before checking PID.ON. This 9039 * pairs with the memory barrier implicit in pi_test_and_set_on 9040 * (see vmx_deliver_posted_interrupt). 9041 * 9042 * 3) This also orders the write to mode from any reads to the page 9043 * tables done while the VCPU is running. Please see the comment 9044 * in kvm_flush_remote_tlbs. 9045 */ 9046 smp_mb__after_srcu_read_unlock(); 9047 9048 /* 9049 * This handles the case where a posted interrupt was 9050 * notified with kvm_vcpu_kick. 9051 */ 9052 if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active) 9053 static_call(kvm_x86_sync_pir_to_irr)(vcpu); 9054 9055 if (kvm_vcpu_exit_request(vcpu)) { 9056 vcpu->mode = OUTSIDE_GUEST_MODE; 9057 smp_wmb(); 9058 local_irq_enable(); 9059 preempt_enable(); 9060 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 9061 r = 1; 9062 goto cancel_injection; 9063 } 9064 9065 if (req_immediate_exit) { 9066 kvm_make_request(KVM_REQ_EVENT, vcpu); 9067 static_call(kvm_x86_request_immediate_exit)(vcpu); 9068 } 9069 9070 fpregs_assert_state_consistent(); 9071 if (test_thread_flag(TIF_NEED_FPU_LOAD)) 9072 switch_fpu_return(); 9073 9074 if (unlikely(vcpu->arch.switch_db_regs)) { 9075 set_debugreg(0, 7); 9076 set_debugreg(vcpu->arch.eff_db[0], 0); 9077 set_debugreg(vcpu->arch.eff_db[1], 1); 9078 set_debugreg(vcpu->arch.eff_db[2], 2); 9079 set_debugreg(vcpu->arch.eff_db[3], 3); 9080 set_debugreg(vcpu->arch.dr6, 6); 9081 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 9082 } 9083 9084 for (;;) { 9085 exit_fastpath = static_call(kvm_x86_run)(vcpu); 9086 if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST)) 9087 break; 9088 9089 if (unlikely(kvm_vcpu_exit_request(vcpu))) { 9090 exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED; 9091 break; 9092 } 9093 9094 if (vcpu->arch.apicv_active) 9095 static_call(kvm_x86_sync_pir_to_irr)(vcpu); 9096 } 9097 9098 /* 9099 * Do this here before restoring debug registers on the host. And 9100 * since we do this before handling the vmexit, a DR access vmexit 9101 * can (a) read the correct value of the debug registers, (b) set 9102 * KVM_DEBUGREG_WONT_EXIT again. 9103 */ 9104 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) { 9105 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP); 9106 static_call(kvm_x86_sync_dirty_debug_regs)(vcpu); 9107 kvm_update_dr0123(vcpu); 9108 kvm_update_dr7(vcpu); 9109 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 9110 } 9111 9112 /* 9113 * If the guest has used debug registers, at least dr7 9114 * will be disabled while returning to the host. 9115 * If we don't have active breakpoints in the host, we don't 9116 * care about the messed up debug address registers. But if 9117 * we have some of them active, restore the old state. 9118 */ 9119 if (hw_breakpoint_active()) 9120 hw_breakpoint_restore(); 9121 9122 vcpu->arch.last_vmentry_cpu = vcpu->cpu; 9123 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); 9124 9125 vcpu->mode = OUTSIDE_GUEST_MODE; 9126 smp_wmb(); 9127 9128 static_call(kvm_x86_handle_exit_irqoff)(vcpu); 9129 9130 /* 9131 * Consume any pending interrupts, including the possible source of 9132 * VM-Exit on SVM and any ticks that occur between VM-Exit and now. 9133 * An instruction is required after local_irq_enable() to fully unblock 9134 * interrupts on processors that implement an interrupt shadow, the 9135 * stat.exits increment will do nicely. 9136 */ 9137 kvm_before_interrupt(vcpu); 9138 local_irq_enable(); 9139 ++vcpu->stat.exits; 9140 local_irq_disable(); 9141 kvm_after_interrupt(vcpu); 9142 9143 if (lapic_in_kernel(vcpu)) { 9144 s64 delta = vcpu->arch.apic->lapic_timer.advance_expire_delta; 9145 if (delta != S64_MIN) { 9146 trace_kvm_wait_lapic_expire(vcpu->vcpu_id, delta); 9147 vcpu->arch.apic->lapic_timer.advance_expire_delta = S64_MIN; 9148 } 9149 } 9150 9151 local_irq_enable(); 9152 preempt_enable(); 9153 9154 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 9155 9156 /* 9157 * Profile KVM exit RIPs: 9158 */ 9159 if (unlikely(prof_on == KVM_PROFILING)) { 9160 unsigned long rip = kvm_rip_read(vcpu); 9161 profile_hit(KVM_PROFILING, (void *)rip); 9162 } 9163 9164 if (unlikely(vcpu->arch.tsc_always_catchup)) 9165 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 9166 9167 if (vcpu->arch.apic_attention) 9168 kvm_lapic_sync_from_vapic(vcpu); 9169 9170 r = static_call(kvm_x86_handle_exit)(vcpu, exit_fastpath); 9171 return r; 9172 9173 cancel_injection: 9174 if (req_immediate_exit) 9175 kvm_make_request(KVM_REQ_EVENT, vcpu); 9176 static_call(kvm_x86_cancel_injection)(vcpu); 9177 if (unlikely(vcpu->arch.apic_attention)) 9178 kvm_lapic_sync_from_vapic(vcpu); 9179 out: 9180 return r; 9181 } 9182 9183 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) 9184 { 9185 if (!kvm_arch_vcpu_runnable(vcpu) && 9186 (!kvm_x86_ops.pre_block || static_call(kvm_x86_pre_block)(vcpu) == 0)) { 9187 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 9188 kvm_vcpu_block(vcpu); 9189 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 9190 9191 if (kvm_x86_ops.post_block) 9192 static_call(kvm_x86_post_block)(vcpu); 9193 9194 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu)) 9195 return 1; 9196 } 9197 9198 kvm_apic_accept_events(vcpu); 9199 switch(vcpu->arch.mp_state) { 9200 case KVM_MP_STATE_HALTED: 9201 case KVM_MP_STATE_AP_RESET_HOLD: 9202 vcpu->arch.pv.pv_unhalted = false; 9203 vcpu->arch.mp_state = 9204 KVM_MP_STATE_RUNNABLE; 9205 fallthrough; 9206 case KVM_MP_STATE_RUNNABLE: 9207 vcpu->arch.apf.halted = false; 9208 break; 9209 case KVM_MP_STATE_INIT_RECEIVED: 9210 break; 9211 default: 9212 return -EINTR; 9213 } 9214 return 1; 9215 } 9216 9217 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu) 9218 { 9219 if (is_guest_mode(vcpu)) 9220 kvm_x86_ops.nested_ops->check_events(vcpu); 9221 9222 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && 9223 !vcpu->arch.apf.halted); 9224 } 9225 9226 static int vcpu_run(struct kvm_vcpu *vcpu) 9227 { 9228 int r; 9229 struct kvm *kvm = vcpu->kvm; 9230 9231 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 9232 vcpu->arch.l1tf_flush_l1d = true; 9233 9234 for (;;) { 9235 if (kvm_vcpu_running(vcpu)) { 9236 r = vcpu_enter_guest(vcpu); 9237 } else { 9238 r = vcpu_block(kvm, vcpu); 9239 } 9240 9241 if (r <= 0) 9242 break; 9243 9244 kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu); 9245 if (kvm_cpu_has_pending_timer(vcpu)) 9246 kvm_inject_pending_timer_irqs(vcpu); 9247 9248 if (dm_request_for_irq_injection(vcpu) && 9249 kvm_vcpu_ready_for_interrupt_injection(vcpu)) { 9250 r = 0; 9251 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; 9252 ++vcpu->stat.request_irq_exits; 9253 break; 9254 } 9255 9256 if (__xfer_to_guest_mode_work_pending()) { 9257 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 9258 r = xfer_to_guest_mode_handle_work(vcpu); 9259 if (r) 9260 return r; 9261 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 9262 } 9263 } 9264 9265 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 9266 9267 return r; 9268 } 9269 9270 static inline int complete_emulated_io(struct kvm_vcpu *vcpu) 9271 { 9272 int r; 9273 9274 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 9275 r = kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE); 9276 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 9277 return r; 9278 } 9279 9280 static int complete_emulated_pio(struct kvm_vcpu *vcpu) 9281 { 9282 BUG_ON(!vcpu->arch.pio.count); 9283 9284 return complete_emulated_io(vcpu); 9285 } 9286 9287 /* 9288 * Implements the following, as a state machine: 9289 * 9290 * read: 9291 * for each fragment 9292 * for each mmio piece in the fragment 9293 * write gpa, len 9294 * exit 9295 * copy data 9296 * execute insn 9297 * 9298 * write: 9299 * for each fragment 9300 * for each mmio piece in the fragment 9301 * write gpa, len 9302 * copy data 9303 * exit 9304 */ 9305 static int complete_emulated_mmio(struct kvm_vcpu *vcpu) 9306 { 9307 struct kvm_run *run = vcpu->run; 9308 struct kvm_mmio_fragment *frag; 9309 unsigned len; 9310 9311 BUG_ON(!vcpu->mmio_needed); 9312 9313 /* Complete previous fragment */ 9314 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment]; 9315 len = min(8u, frag->len); 9316 if (!vcpu->mmio_is_write) 9317 memcpy(frag->data, run->mmio.data, len); 9318 9319 if (frag->len <= 8) { 9320 /* Switch to the next fragment. */ 9321 frag++; 9322 vcpu->mmio_cur_fragment++; 9323 } else { 9324 /* Go forward to the next mmio piece. */ 9325 frag->data += len; 9326 frag->gpa += len; 9327 frag->len -= len; 9328 } 9329 9330 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) { 9331 vcpu->mmio_needed = 0; 9332 9333 /* FIXME: return into emulator if single-stepping. */ 9334 if (vcpu->mmio_is_write) 9335 return 1; 9336 vcpu->mmio_read_completed = 1; 9337 return complete_emulated_io(vcpu); 9338 } 9339 9340 run->exit_reason = KVM_EXIT_MMIO; 9341 run->mmio.phys_addr = frag->gpa; 9342 if (vcpu->mmio_is_write) 9343 memcpy(run->mmio.data, frag->data, min(8u, frag->len)); 9344 run->mmio.len = min(8u, frag->len); 9345 run->mmio.is_write = vcpu->mmio_is_write; 9346 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 9347 return 0; 9348 } 9349 9350 static void kvm_save_current_fpu(struct fpu *fpu) 9351 { 9352 /* 9353 * If the target FPU state is not resident in the CPU registers, just 9354 * memcpy() from current, else save CPU state directly to the target. 9355 */ 9356 if (test_thread_flag(TIF_NEED_FPU_LOAD)) 9357 memcpy(&fpu->state, ¤t->thread.fpu.state, 9358 fpu_kernel_xstate_size); 9359 else 9360 copy_fpregs_to_fpstate(fpu); 9361 } 9362 9363 /* Swap (qemu) user FPU context for the guest FPU context. */ 9364 static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) 9365 { 9366 fpregs_lock(); 9367 9368 kvm_save_current_fpu(vcpu->arch.user_fpu); 9369 9370 /* 9371 * Guests with protected state can't have it set by the hypervisor, 9372 * so skip trying to set it. 9373 */ 9374 if (vcpu->arch.guest_fpu) 9375 /* PKRU is separately restored in kvm_x86_ops.run. */ 9376 __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state, 9377 ~XFEATURE_MASK_PKRU); 9378 9379 fpregs_mark_activate(); 9380 fpregs_unlock(); 9381 9382 trace_kvm_fpu(1); 9383 } 9384 9385 /* When vcpu_run ends, restore user space FPU context. */ 9386 static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) 9387 { 9388 fpregs_lock(); 9389 9390 /* 9391 * Guests with protected state can't have it read by the hypervisor, 9392 * so skip trying to save it. 9393 */ 9394 if (vcpu->arch.guest_fpu) 9395 kvm_save_current_fpu(vcpu->arch.guest_fpu); 9396 9397 copy_kernel_to_fpregs(&vcpu->arch.user_fpu->state); 9398 9399 fpregs_mark_activate(); 9400 fpregs_unlock(); 9401 9402 ++vcpu->stat.fpu_reload; 9403 trace_kvm_fpu(0); 9404 } 9405 9406 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 9407 { 9408 struct kvm_run *kvm_run = vcpu->run; 9409 int r; 9410 9411 vcpu_load(vcpu); 9412 kvm_sigset_activate(vcpu); 9413 kvm_run->flags = 0; 9414 kvm_load_guest_fpu(vcpu); 9415 9416 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { 9417 if (kvm_run->immediate_exit) { 9418 r = -EINTR; 9419 goto out; 9420 } 9421 kvm_vcpu_block(vcpu); 9422 kvm_apic_accept_events(vcpu); 9423 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 9424 r = -EAGAIN; 9425 if (signal_pending(current)) { 9426 r = -EINTR; 9427 kvm_run->exit_reason = KVM_EXIT_INTR; 9428 ++vcpu->stat.signal_exits; 9429 } 9430 goto out; 9431 } 9432 9433 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { 9434 r = -EINVAL; 9435 goto out; 9436 } 9437 9438 if (kvm_run->kvm_dirty_regs) { 9439 r = sync_regs(vcpu); 9440 if (r != 0) 9441 goto out; 9442 } 9443 9444 /* re-sync apic's tpr */ 9445 if (!lapic_in_kernel(vcpu)) { 9446 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) { 9447 r = -EINVAL; 9448 goto out; 9449 } 9450 } 9451 9452 if (unlikely(vcpu->arch.complete_userspace_io)) { 9453 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; 9454 vcpu->arch.complete_userspace_io = NULL; 9455 r = cui(vcpu); 9456 if (r <= 0) 9457 goto out; 9458 } else 9459 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); 9460 9461 if (kvm_run->immediate_exit) 9462 r = -EINTR; 9463 else 9464 r = vcpu_run(vcpu); 9465 9466 out: 9467 kvm_put_guest_fpu(vcpu); 9468 if (kvm_run->kvm_valid_regs) 9469 store_regs(vcpu); 9470 post_kvm_run_save(vcpu); 9471 kvm_sigset_deactivate(vcpu); 9472 9473 vcpu_put(vcpu); 9474 return r; 9475 } 9476 9477 static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 9478 { 9479 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) { 9480 /* 9481 * We are here if userspace calls get_regs() in the middle of 9482 * instruction emulation. Registers state needs to be copied 9483 * back from emulation context to vcpu. Userspace shouldn't do 9484 * that usually, but some bad designed PV devices (vmware 9485 * backdoor interface) need this to work 9486 */ 9487 emulator_writeback_register_cache(vcpu->arch.emulate_ctxt); 9488 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 9489 } 9490 regs->rax = kvm_rax_read(vcpu); 9491 regs->rbx = kvm_rbx_read(vcpu); 9492 regs->rcx = kvm_rcx_read(vcpu); 9493 regs->rdx = kvm_rdx_read(vcpu); 9494 regs->rsi = kvm_rsi_read(vcpu); 9495 regs->rdi = kvm_rdi_read(vcpu); 9496 regs->rsp = kvm_rsp_read(vcpu); 9497 regs->rbp = kvm_rbp_read(vcpu); 9498 #ifdef CONFIG_X86_64 9499 regs->r8 = kvm_r8_read(vcpu); 9500 regs->r9 = kvm_r9_read(vcpu); 9501 regs->r10 = kvm_r10_read(vcpu); 9502 regs->r11 = kvm_r11_read(vcpu); 9503 regs->r12 = kvm_r12_read(vcpu); 9504 regs->r13 = kvm_r13_read(vcpu); 9505 regs->r14 = kvm_r14_read(vcpu); 9506 regs->r15 = kvm_r15_read(vcpu); 9507 #endif 9508 9509 regs->rip = kvm_rip_read(vcpu); 9510 regs->rflags = kvm_get_rflags(vcpu); 9511 } 9512 9513 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 9514 { 9515 vcpu_load(vcpu); 9516 __get_regs(vcpu, regs); 9517 vcpu_put(vcpu); 9518 return 0; 9519 } 9520 9521 static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 9522 { 9523 vcpu->arch.emulate_regs_need_sync_from_vcpu = true; 9524 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 9525 9526 kvm_rax_write(vcpu, regs->rax); 9527 kvm_rbx_write(vcpu, regs->rbx); 9528 kvm_rcx_write(vcpu, regs->rcx); 9529 kvm_rdx_write(vcpu, regs->rdx); 9530 kvm_rsi_write(vcpu, regs->rsi); 9531 kvm_rdi_write(vcpu, regs->rdi); 9532 kvm_rsp_write(vcpu, regs->rsp); 9533 kvm_rbp_write(vcpu, regs->rbp); 9534 #ifdef CONFIG_X86_64 9535 kvm_r8_write(vcpu, regs->r8); 9536 kvm_r9_write(vcpu, regs->r9); 9537 kvm_r10_write(vcpu, regs->r10); 9538 kvm_r11_write(vcpu, regs->r11); 9539 kvm_r12_write(vcpu, regs->r12); 9540 kvm_r13_write(vcpu, regs->r13); 9541 kvm_r14_write(vcpu, regs->r14); 9542 kvm_r15_write(vcpu, regs->r15); 9543 #endif 9544 9545 kvm_rip_write(vcpu, regs->rip); 9546 kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED); 9547 9548 vcpu->arch.exception.pending = false; 9549 9550 kvm_make_request(KVM_REQ_EVENT, vcpu); 9551 } 9552 9553 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 9554 { 9555 vcpu_load(vcpu); 9556 __set_regs(vcpu, regs); 9557 vcpu_put(vcpu); 9558 return 0; 9559 } 9560 9561 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) 9562 { 9563 struct kvm_segment cs; 9564 9565 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 9566 *db = cs.db; 9567 *l = cs.l; 9568 } 9569 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); 9570 9571 static void __get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 9572 { 9573 struct desc_ptr dt; 9574 9575 if (vcpu->arch.guest_state_protected) 9576 goto skip_protected_regs; 9577 9578 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 9579 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 9580 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); 9581 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 9582 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 9583 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 9584 9585 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 9586 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 9587 9588 static_call(kvm_x86_get_idt)(vcpu, &dt); 9589 sregs->idt.limit = dt.size; 9590 sregs->idt.base = dt.address; 9591 static_call(kvm_x86_get_gdt)(vcpu, &dt); 9592 sregs->gdt.limit = dt.size; 9593 sregs->gdt.base = dt.address; 9594 9595 sregs->cr2 = vcpu->arch.cr2; 9596 sregs->cr3 = kvm_read_cr3(vcpu); 9597 9598 skip_protected_regs: 9599 sregs->cr0 = kvm_read_cr0(vcpu); 9600 sregs->cr4 = kvm_read_cr4(vcpu); 9601 sregs->cr8 = kvm_get_cr8(vcpu); 9602 sregs->efer = vcpu->arch.efer; 9603 sregs->apic_base = kvm_get_apic_base(vcpu); 9604 9605 memset(sregs->interrupt_bitmap, 0, sizeof(sregs->interrupt_bitmap)); 9606 9607 if (vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft) 9608 set_bit(vcpu->arch.interrupt.nr, 9609 (unsigned long *)sregs->interrupt_bitmap); 9610 } 9611 9612 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 9613 struct kvm_sregs *sregs) 9614 { 9615 vcpu_load(vcpu); 9616 __get_sregs(vcpu, sregs); 9617 vcpu_put(vcpu); 9618 return 0; 9619 } 9620 9621 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 9622 struct kvm_mp_state *mp_state) 9623 { 9624 vcpu_load(vcpu); 9625 if (kvm_mpx_supported()) 9626 kvm_load_guest_fpu(vcpu); 9627 9628 kvm_apic_accept_events(vcpu); 9629 if ((vcpu->arch.mp_state == KVM_MP_STATE_HALTED || 9630 vcpu->arch.mp_state == KVM_MP_STATE_AP_RESET_HOLD) && 9631 vcpu->arch.pv.pv_unhalted) 9632 mp_state->mp_state = KVM_MP_STATE_RUNNABLE; 9633 else 9634 mp_state->mp_state = vcpu->arch.mp_state; 9635 9636 if (kvm_mpx_supported()) 9637 kvm_put_guest_fpu(vcpu); 9638 vcpu_put(vcpu); 9639 return 0; 9640 } 9641 9642 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 9643 struct kvm_mp_state *mp_state) 9644 { 9645 int ret = -EINVAL; 9646 9647 vcpu_load(vcpu); 9648 9649 if (!lapic_in_kernel(vcpu) && 9650 mp_state->mp_state != KVM_MP_STATE_RUNNABLE) 9651 goto out; 9652 9653 /* 9654 * KVM_MP_STATE_INIT_RECEIVED means the processor is in 9655 * INIT state; latched init should be reported using 9656 * KVM_SET_VCPU_EVENTS, so reject it here. 9657 */ 9658 if ((kvm_vcpu_latch_init(vcpu) || vcpu->arch.smi_pending) && 9659 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED || 9660 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED)) 9661 goto out; 9662 9663 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) { 9664 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; 9665 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events); 9666 } else 9667 vcpu->arch.mp_state = mp_state->mp_state; 9668 kvm_make_request(KVM_REQ_EVENT, vcpu); 9669 9670 ret = 0; 9671 out: 9672 vcpu_put(vcpu); 9673 return ret; 9674 } 9675 9676 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, 9677 int reason, bool has_error_code, u32 error_code) 9678 { 9679 struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; 9680 int ret; 9681 9682 init_emulate_ctxt(vcpu); 9683 9684 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason, 9685 has_error_code, error_code); 9686 if (ret) { 9687 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 9688 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 9689 vcpu->run->internal.ndata = 0; 9690 return 0; 9691 } 9692 9693 kvm_rip_write(vcpu, ctxt->eip); 9694 kvm_set_rflags(vcpu, ctxt->eflags); 9695 return 1; 9696 } 9697 EXPORT_SYMBOL_GPL(kvm_task_switch); 9698 9699 static bool kvm_is_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 9700 { 9701 if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) { 9702 /* 9703 * When EFER.LME and CR0.PG are set, the processor is in 9704 * 64-bit mode (though maybe in a 32-bit code segment). 9705 * CR4.PAE and EFER.LMA must be set. 9706 */ 9707 if (!(sregs->cr4 & X86_CR4_PAE) || !(sregs->efer & EFER_LMA)) 9708 return false; 9709 if (kvm_vcpu_is_illegal_gpa(vcpu, sregs->cr3)) 9710 return false; 9711 } else { 9712 /* 9713 * Not in 64-bit mode: EFER.LMA is clear and the code 9714 * segment cannot be 64-bit. 9715 */ 9716 if (sregs->efer & EFER_LMA || sregs->cs.l) 9717 return false; 9718 } 9719 9720 return kvm_is_valid_cr4(vcpu, sregs->cr4); 9721 } 9722 9723 static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 9724 { 9725 struct msr_data apic_base_msr; 9726 int mmu_reset_needed = 0; 9727 int pending_vec, max_bits, idx; 9728 struct desc_ptr dt; 9729 int ret = -EINVAL; 9730 9731 if (!kvm_is_valid_sregs(vcpu, sregs)) 9732 goto out; 9733 9734 apic_base_msr.data = sregs->apic_base; 9735 apic_base_msr.host_initiated = true; 9736 if (kvm_set_apic_base(vcpu, &apic_base_msr)) 9737 goto out; 9738 9739 if (vcpu->arch.guest_state_protected) 9740 goto skip_protected_regs; 9741 9742 dt.size = sregs->idt.limit; 9743 dt.address = sregs->idt.base; 9744 static_call(kvm_x86_set_idt)(vcpu, &dt); 9745 dt.size = sregs->gdt.limit; 9746 dt.address = sregs->gdt.base; 9747 static_call(kvm_x86_set_gdt)(vcpu, &dt); 9748 9749 vcpu->arch.cr2 = sregs->cr2; 9750 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3; 9751 vcpu->arch.cr3 = sregs->cr3; 9752 kvm_register_mark_available(vcpu, VCPU_EXREG_CR3); 9753 9754 kvm_set_cr8(vcpu, sregs->cr8); 9755 9756 mmu_reset_needed |= vcpu->arch.efer != sregs->efer; 9757 static_call(kvm_x86_set_efer)(vcpu, sregs->efer); 9758 9759 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; 9760 static_call(kvm_x86_set_cr0)(vcpu, sregs->cr0); 9761 vcpu->arch.cr0 = sregs->cr0; 9762 9763 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; 9764 static_call(kvm_x86_set_cr4)(vcpu, sregs->cr4); 9765 9766 idx = srcu_read_lock(&vcpu->kvm->srcu); 9767 if (is_pae_paging(vcpu)) { 9768 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); 9769 mmu_reset_needed = 1; 9770 } 9771 srcu_read_unlock(&vcpu->kvm->srcu, idx); 9772 9773 if (mmu_reset_needed) 9774 kvm_mmu_reset_context(vcpu); 9775 9776 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 9777 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 9778 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); 9779 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 9780 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 9781 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 9782 9783 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 9784 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 9785 9786 update_cr8_intercept(vcpu); 9787 9788 /* Older userspace won't unhalt the vcpu on reset. */ 9789 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && 9790 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && 9791 !is_protmode(vcpu)) 9792 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 9793 9794 skip_protected_regs: 9795 max_bits = KVM_NR_INTERRUPTS; 9796 pending_vec = find_first_bit( 9797 (const unsigned long *)sregs->interrupt_bitmap, max_bits); 9798 if (pending_vec < max_bits) { 9799 kvm_queue_interrupt(vcpu, pending_vec, false); 9800 pr_debug("Set back pending irq %d\n", pending_vec); 9801 } 9802 9803 kvm_make_request(KVM_REQ_EVENT, vcpu); 9804 9805 ret = 0; 9806 out: 9807 return ret; 9808 } 9809 9810 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 9811 struct kvm_sregs *sregs) 9812 { 9813 int ret; 9814 9815 vcpu_load(vcpu); 9816 ret = __set_sregs(vcpu, sregs); 9817 vcpu_put(vcpu); 9818 return ret; 9819 } 9820 9821 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 9822 struct kvm_guest_debug *dbg) 9823 { 9824 unsigned long rflags; 9825 int i, r; 9826 9827 if (vcpu->arch.guest_state_protected) 9828 return -EINVAL; 9829 9830 vcpu_load(vcpu); 9831 9832 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { 9833 r = -EBUSY; 9834 if (vcpu->arch.exception.pending) 9835 goto out; 9836 if (dbg->control & KVM_GUESTDBG_INJECT_DB) 9837 kvm_queue_exception(vcpu, DB_VECTOR); 9838 else 9839 kvm_queue_exception(vcpu, BP_VECTOR); 9840 } 9841 9842 /* 9843 * Read rflags as long as potentially injected trace flags are still 9844 * filtered out. 9845 */ 9846 rflags = kvm_get_rflags(vcpu); 9847 9848 vcpu->guest_debug = dbg->control; 9849 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) 9850 vcpu->guest_debug = 0; 9851 9852 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { 9853 for (i = 0; i < KVM_NR_DB_REGS; ++i) 9854 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; 9855 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; 9856 } else { 9857 for (i = 0; i < KVM_NR_DB_REGS; i++) 9858 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 9859 } 9860 kvm_update_dr7(vcpu); 9861 9862 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 9863 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + 9864 get_segment_base(vcpu, VCPU_SREG_CS); 9865 9866 /* 9867 * Trigger an rflags update that will inject or remove the trace 9868 * flags. 9869 */ 9870 kvm_set_rflags(vcpu, rflags); 9871 9872 static_call(kvm_x86_update_exception_bitmap)(vcpu); 9873 9874 r = 0; 9875 9876 out: 9877 vcpu_put(vcpu); 9878 return r; 9879 } 9880 9881 /* 9882 * Translate a guest virtual address to a guest physical address. 9883 */ 9884 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 9885 struct kvm_translation *tr) 9886 { 9887 unsigned long vaddr = tr->linear_address; 9888 gpa_t gpa; 9889 int idx; 9890 9891 vcpu_load(vcpu); 9892 9893 idx = srcu_read_lock(&vcpu->kvm->srcu); 9894 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); 9895 srcu_read_unlock(&vcpu->kvm->srcu, idx); 9896 tr->physical_address = gpa; 9897 tr->valid = gpa != UNMAPPED_GVA; 9898 tr->writeable = 1; 9899 tr->usermode = 0; 9900 9901 vcpu_put(vcpu); 9902 return 0; 9903 } 9904 9905 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 9906 { 9907 struct fxregs_state *fxsave; 9908 9909 if (!vcpu->arch.guest_fpu) 9910 return 0; 9911 9912 vcpu_load(vcpu); 9913 9914 fxsave = &vcpu->arch.guest_fpu->state.fxsave; 9915 memcpy(fpu->fpr, fxsave->st_space, 128); 9916 fpu->fcw = fxsave->cwd; 9917 fpu->fsw = fxsave->swd; 9918 fpu->ftwx = fxsave->twd; 9919 fpu->last_opcode = fxsave->fop; 9920 fpu->last_ip = fxsave->rip; 9921 fpu->last_dp = fxsave->rdp; 9922 memcpy(fpu->xmm, fxsave->xmm_space, sizeof(fxsave->xmm_space)); 9923 9924 vcpu_put(vcpu); 9925 return 0; 9926 } 9927 9928 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 9929 { 9930 struct fxregs_state *fxsave; 9931 9932 if (!vcpu->arch.guest_fpu) 9933 return 0; 9934 9935 vcpu_load(vcpu); 9936 9937 fxsave = &vcpu->arch.guest_fpu->state.fxsave; 9938 9939 memcpy(fxsave->st_space, fpu->fpr, 128); 9940 fxsave->cwd = fpu->fcw; 9941 fxsave->swd = fpu->fsw; 9942 fxsave->twd = fpu->ftwx; 9943 fxsave->fop = fpu->last_opcode; 9944 fxsave->rip = fpu->last_ip; 9945 fxsave->rdp = fpu->last_dp; 9946 memcpy(fxsave->xmm_space, fpu->xmm, sizeof(fxsave->xmm_space)); 9947 9948 vcpu_put(vcpu); 9949 return 0; 9950 } 9951 9952 static void store_regs(struct kvm_vcpu *vcpu) 9953 { 9954 BUILD_BUG_ON(sizeof(struct kvm_sync_regs) > SYNC_REGS_SIZE_BYTES); 9955 9956 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_REGS) 9957 __get_regs(vcpu, &vcpu->run->s.regs.regs); 9958 9959 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_SREGS) 9960 __get_sregs(vcpu, &vcpu->run->s.regs.sregs); 9961 9962 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_EVENTS) 9963 kvm_vcpu_ioctl_x86_get_vcpu_events( 9964 vcpu, &vcpu->run->s.regs.events); 9965 } 9966 9967 static int sync_regs(struct kvm_vcpu *vcpu) 9968 { 9969 if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS) 9970 return -EINVAL; 9971 9972 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) { 9973 __set_regs(vcpu, &vcpu->run->s.regs.regs); 9974 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS; 9975 } 9976 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_SREGS) { 9977 if (__set_sregs(vcpu, &vcpu->run->s.regs.sregs)) 9978 return -EINVAL; 9979 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_SREGS; 9980 } 9981 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_EVENTS) { 9982 if (kvm_vcpu_ioctl_x86_set_vcpu_events( 9983 vcpu, &vcpu->run->s.regs.events)) 9984 return -EINVAL; 9985 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_EVENTS; 9986 } 9987 9988 return 0; 9989 } 9990 9991 static void fx_init(struct kvm_vcpu *vcpu) 9992 { 9993 if (!vcpu->arch.guest_fpu) 9994 return; 9995 9996 fpstate_init(&vcpu->arch.guest_fpu->state); 9997 if (boot_cpu_has(X86_FEATURE_XSAVES)) 9998 vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv = 9999 host_xcr0 | XSTATE_COMPACTION_ENABLED; 10000 10001 /* 10002 * Ensure guest xcr0 is valid for loading 10003 */ 10004 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 10005 10006 vcpu->arch.cr0 |= X86_CR0_ET; 10007 } 10008 10009 void kvm_free_guest_fpu(struct kvm_vcpu *vcpu) 10010 { 10011 if (vcpu->arch.guest_fpu) { 10012 kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu); 10013 vcpu->arch.guest_fpu = NULL; 10014 } 10015 } 10016 EXPORT_SYMBOL_GPL(kvm_free_guest_fpu); 10017 10018 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 10019 { 10020 if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) 10021 pr_warn_once("kvm: SMP vm created on host with unstable TSC; " 10022 "guest TSC will not be reliable\n"); 10023 10024 return 0; 10025 } 10026 10027 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 10028 { 10029 struct page *page; 10030 int r; 10031 10032 if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu)) 10033 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 10034 else 10035 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; 10036 10037 kvm_set_tsc_khz(vcpu, max_tsc_khz); 10038 10039 r = kvm_mmu_create(vcpu); 10040 if (r < 0) 10041 return r; 10042 10043 if (irqchip_in_kernel(vcpu->kvm)) { 10044 r = kvm_create_lapic(vcpu, lapic_timer_advance_ns); 10045 if (r < 0) 10046 goto fail_mmu_destroy; 10047 if (kvm_apicv_activated(vcpu->kvm)) 10048 vcpu->arch.apicv_active = true; 10049 } else 10050 static_branch_inc(&kvm_has_noapic_vcpu); 10051 10052 r = -ENOMEM; 10053 10054 page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 10055 if (!page) 10056 goto fail_free_lapic; 10057 vcpu->arch.pio_data = page_address(page); 10058 10059 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, 10060 GFP_KERNEL_ACCOUNT); 10061 if (!vcpu->arch.mce_banks) 10062 goto fail_free_pio_data; 10063 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; 10064 10065 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, 10066 GFP_KERNEL_ACCOUNT)) 10067 goto fail_free_mce_banks; 10068 10069 if (!alloc_emulate_ctxt(vcpu)) 10070 goto free_wbinvd_dirty_mask; 10071 10072 vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache, 10073 GFP_KERNEL_ACCOUNT); 10074 if (!vcpu->arch.user_fpu) { 10075 pr_err("kvm: failed to allocate userspace's fpu\n"); 10076 goto free_emulate_ctxt; 10077 } 10078 10079 vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache, 10080 GFP_KERNEL_ACCOUNT); 10081 if (!vcpu->arch.guest_fpu) { 10082 pr_err("kvm: failed to allocate vcpu's fpu\n"); 10083 goto free_user_fpu; 10084 } 10085 fx_init(vcpu); 10086 10087 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); 10088 vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu); 10089 10090 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT; 10091 10092 kvm_async_pf_hash_reset(vcpu); 10093 kvm_pmu_init(vcpu); 10094 10095 vcpu->arch.pending_external_vector = -1; 10096 vcpu->arch.preempted_in_kernel = false; 10097 10098 r = static_call(kvm_x86_vcpu_create)(vcpu); 10099 if (r) 10100 goto free_guest_fpu; 10101 10102 vcpu->arch.arch_capabilities = kvm_get_arch_capabilities(); 10103 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT; 10104 kvm_vcpu_mtrr_init(vcpu); 10105 vcpu_load(vcpu); 10106 kvm_vcpu_reset(vcpu, false); 10107 kvm_init_mmu(vcpu, false); 10108 vcpu_put(vcpu); 10109 return 0; 10110 10111 free_guest_fpu: 10112 kvm_free_guest_fpu(vcpu); 10113 free_user_fpu: 10114 kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu); 10115 free_emulate_ctxt: 10116 kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt); 10117 free_wbinvd_dirty_mask: 10118 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask); 10119 fail_free_mce_banks: 10120 kfree(vcpu->arch.mce_banks); 10121 fail_free_pio_data: 10122 free_page((unsigned long)vcpu->arch.pio_data); 10123 fail_free_lapic: 10124 kvm_free_lapic(vcpu); 10125 fail_mmu_destroy: 10126 kvm_mmu_destroy(vcpu); 10127 return r; 10128 } 10129 10130 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 10131 { 10132 struct kvm *kvm = vcpu->kvm; 10133 10134 if (mutex_lock_killable(&vcpu->mutex)) 10135 return; 10136 vcpu_load(vcpu); 10137 kvm_synchronize_tsc(vcpu, 0); 10138 vcpu_put(vcpu); 10139 10140 /* poll control enabled by default */ 10141 vcpu->arch.msr_kvm_poll_control = 1; 10142 10143 mutex_unlock(&vcpu->mutex); 10144 10145 if (kvmclock_periodic_sync && vcpu->vcpu_idx == 0) 10146 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 10147 KVMCLOCK_SYNC_PERIOD); 10148 } 10149 10150 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 10151 { 10152 struct gfn_to_pfn_cache *cache = &vcpu->arch.st.cache; 10153 int idx; 10154 10155 kvm_release_pfn(cache->pfn, cache->dirty, cache); 10156 10157 kvmclock_reset(vcpu); 10158 10159 static_call(kvm_x86_vcpu_free)(vcpu); 10160 10161 kmem_cache_free(x86_emulator_cache, vcpu->arch.emulate_ctxt); 10162 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask); 10163 kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu); 10164 kvm_free_guest_fpu(vcpu); 10165 10166 kvm_hv_vcpu_uninit(vcpu); 10167 kvm_pmu_destroy(vcpu); 10168 kfree(vcpu->arch.mce_banks); 10169 kvm_free_lapic(vcpu); 10170 idx = srcu_read_lock(&vcpu->kvm->srcu); 10171 kvm_mmu_destroy(vcpu); 10172 srcu_read_unlock(&vcpu->kvm->srcu, idx); 10173 free_page((unsigned long)vcpu->arch.pio_data); 10174 kvfree(vcpu->arch.cpuid_entries); 10175 if (!lapic_in_kernel(vcpu)) 10176 static_branch_dec(&kvm_has_noapic_vcpu); 10177 } 10178 10179 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) 10180 { 10181 kvm_lapic_reset(vcpu, init_event); 10182 10183 vcpu->arch.hflags = 0; 10184 10185 vcpu->arch.smi_pending = 0; 10186 vcpu->arch.smi_count = 0; 10187 atomic_set(&vcpu->arch.nmi_queued, 0); 10188 vcpu->arch.nmi_pending = 0; 10189 vcpu->arch.nmi_injected = false; 10190 kvm_clear_interrupt_queue(vcpu); 10191 kvm_clear_exception_queue(vcpu); 10192 10193 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); 10194 kvm_update_dr0123(vcpu); 10195 vcpu->arch.dr6 = DR6_ACTIVE_LOW; 10196 vcpu->arch.dr7 = DR7_FIXED_1; 10197 kvm_update_dr7(vcpu); 10198 10199 vcpu->arch.cr2 = 0; 10200 10201 kvm_make_request(KVM_REQ_EVENT, vcpu); 10202 vcpu->arch.apf.msr_en_val = 0; 10203 vcpu->arch.apf.msr_int_val = 0; 10204 vcpu->arch.st.msr_val = 0; 10205 10206 kvmclock_reset(vcpu); 10207 10208 kvm_clear_async_pf_completion_queue(vcpu); 10209 kvm_async_pf_hash_reset(vcpu); 10210 vcpu->arch.apf.halted = false; 10211 10212 if (vcpu->arch.guest_fpu && kvm_mpx_supported()) { 10213 void *mpx_state_buffer; 10214 10215 /* 10216 * To avoid have the INIT path from kvm_apic_has_events() that be 10217 * called with loaded FPU and does not let userspace fix the state. 10218 */ 10219 if (init_event) 10220 kvm_put_guest_fpu(vcpu); 10221 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, 10222 XFEATURE_BNDREGS); 10223 if (mpx_state_buffer) 10224 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state)); 10225 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, 10226 XFEATURE_BNDCSR); 10227 if (mpx_state_buffer) 10228 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr)); 10229 if (init_event) 10230 kvm_load_guest_fpu(vcpu); 10231 } 10232 10233 if (!init_event) { 10234 kvm_pmu_reset(vcpu); 10235 vcpu->arch.smbase = 0x30000; 10236 10237 vcpu->arch.msr_misc_features_enables = 0; 10238 10239 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 10240 } 10241 10242 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); 10243 vcpu->arch.regs_avail = ~0; 10244 vcpu->arch.regs_dirty = ~0; 10245 10246 vcpu->arch.ia32_xss = 0; 10247 10248 static_call(kvm_x86_vcpu_reset)(vcpu, init_event); 10249 } 10250 10251 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) 10252 { 10253 struct kvm_segment cs; 10254 10255 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 10256 cs.selector = vector << 8; 10257 cs.base = vector << 12; 10258 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 10259 kvm_rip_write(vcpu, 0); 10260 } 10261 EXPORT_SYMBOL_GPL(kvm_vcpu_deliver_sipi_vector); 10262 10263 int kvm_arch_hardware_enable(void) 10264 { 10265 struct kvm *kvm; 10266 struct kvm_vcpu *vcpu; 10267 int i; 10268 int ret; 10269 u64 local_tsc; 10270 u64 max_tsc = 0; 10271 bool stable, backwards_tsc = false; 10272 10273 kvm_user_return_msr_cpu_online(); 10274 ret = static_call(kvm_x86_hardware_enable)(); 10275 if (ret != 0) 10276 return ret; 10277 10278 local_tsc = rdtsc(); 10279 stable = !kvm_check_tsc_unstable(); 10280 list_for_each_entry(kvm, &vm_list, vm_list) { 10281 kvm_for_each_vcpu(i, vcpu, kvm) { 10282 if (!stable && vcpu->cpu == smp_processor_id()) 10283 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 10284 if (stable && vcpu->arch.last_host_tsc > local_tsc) { 10285 backwards_tsc = true; 10286 if (vcpu->arch.last_host_tsc > max_tsc) 10287 max_tsc = vcpu->arch.last_host_tsc; 10288 } 10289 } 10290 } 10291 10292 /* 10293 * Sometimes, even reliable TSCs go backwards. This happens on 10294 * platforms that reset TSC during suspend or hibernate actions, but 10295 * maintain synchronization. We must compensate. Fortunately, we can 10296 * detect that condition here, which happens early in CPU bringup, 10297 * before any KVM threads can be running. Unfortunately, we can't 10298 * bring the TSCs fully up to date with real time, as we aren't yet far 10299 * enough into CPU bringup that we know how much real time has actually 10300 * elapsed; our helper function, ktime_get_boottime_ns() will be using boot 10301 * variables that haven't been updated yet. 10302 * 10303 * So we simply find the maximum observed TSC above, then record the 10304 * adjustment to TSC in each VCPU. When the VCPU later gets loaded, 10305 * the adjustment will be applied. Note that we accumulate 10306 * adjustments, in case multiple suspend cycles happen before some VCPU 10307 * gets a chance to run again. In the event that no KVM threads get a 10308 * chance to run, we will miss the entire elapsed period, as we'll have 10309 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may 10310 * loose cycle time. This isn't too big a deal, since the loss will be 10311 * uniform across all VCPUs (not to mention the scenario is extremely 10312 * unlikely). It is possible that a second hibernate recovery happens 10313 * much faster than a first, causing the observed TSC here to be 10314 * smaller; this would require additional padding adjustment, which is 10315 * why we set last_host_tsc to the local tsc observed here. 10316 * 10317 * N.B. - this code below runs only on platforms with reliable TSC, 10318 * as that is the only way backwards_tsc is set above. Also note 10319 * that this runs for ALL vcpus, which is not a bug; all VCPUs should 10320 * have the same delta_cyc adjustment applied if backwards_tsc 10321 * is detected. Note further, this adjustment is only done once, 10322 * as we reset last_host_tsc on all VCPUs to stop this from being 10323 * called multiple times (one for each physical CPU bringup). 10324 * 10325 * Platforms with unreliable TSCs don't have to deal with this, they 10326 * will be compensated by the logic in vcpu_load, which sets the TSC to 10327 * catchup mode. This will catchup all VCPUs to real time, but cannot 10328 * guarantee that they stay in perfect synchronization. 10329 */ 10330 if (backwards_tsc) { 10331 u64 delta_cyc = max_tsc - local_tsc; 10332 list_for_each_entry(kvm, &vm_list, vm_list) { 10333 kvm->arch.backwards_tsc_observed = true; 10334 kvm_for_each_vcpu(i, vcpu, kvm) { 10335 vcpu->arch.tsc_offset_adjustment += delta_cyc; 10336 vcpu->arch.last_host_tsc = local_tsc; 10337 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 10338 } 10339 10340 /* 10341 * We have to disable TSC offset matching.. if you were 10342 * booting a VM while issuing an S4 host suspend.... 10343 * you may have some problem. Solving this issue is 10344 * left as an exercise to the reader. 10345 */ 10346 kvm->arch.last_tsc_nsec = 0; 10347 kvm->arch.last_tsc_write = 0; 10348 } 10349 10350 } 10351 return 0; 10352 } 10353 10354 void kvm_arch_hardware_disable(void) 10355 { 10356 static_call(kvm_x86_hardware_disable)(); 10357 drop_user_return_notifiers(); 10358 } 10359 10360 int kvm_arch_hardware_setup(void *opaque) 10361 { 10362 struct kvm_x86_init_ops *ops = opaque; 10363 int r; 10364 10365 rdmsrl_safe(MSR_EFER, &host_efer); 10366 10367 if (boot_cpu_has(X86_FEATURE_XSAVES)) 10368 rdmsrl(MSR_IA32_XSS, host_xss); 10369 10370 r = ops->hardware_setup(); 10371 if (r != 0) 10372 return r; 10373 10374 memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); 10375 kvm_ops_static_call_update(); 10376 10377 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) 10378 supported_xss = 0; 10379 10380 #define __kvm_cpu_cap_has(UNUSED_, f) kvm_cpu_cap_has(f) 10381 cr4_reserved_bits = __cr4_reserved_bits(__kvm_cpu_cap_has, UNUSED_); 10382 #undef __kvm_cpu_cap_has 10383 10384 if (kvm_has_tsc_control) { 10385 /* 10386 * Make sure the user can only configure tsc_khz values that 10387 * fit into a signed integer. 10388 * A min value is not calculated because it will always 10389 * be 1 on all machines. 10390 */ 10391 u64 max = min(0x7fffffffULL, 10392 __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz)); 10393 kvm_max_guest_tsc_khz = max; 10394 10395 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits; 10396 } 10397 10398 kvm_init_msr_list(); 10399 return 0; 10400 } 10401 10402 void kvm_arch_hardware_unsetup(void) 10403 { 10404 static_call(kvm_x86_hardware_unsetup)(); 10405 } 10406 10407 int kvm_arch_check_processor_compat(void *opaque) 10408 { 10409 struct cpuinfo_x86 *c = &cpu_data(smp_processor_id()); 10410 struct kvm_x86_init_ops *ops = opaque; 10411 10412 WARN_ON(!irqs_disabled()); 10413 10414 if (__cr4_reserved_bits(cpu_has, c) != 10415 __cr4_reserved_bits(cpu_has, &boot_cpu_data)) 10416 return -EIO; 10417 10418 return ops->check_processor_compatibility(); 10419 } 10420 10421 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) 10422 { 10423 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; 10424 } 10425 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); 10426 10427 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) 10428 { 10429 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0; 10430 } 10431 10432 __read_mostly DEFINE_STATIC_KEY_FALSE(kvm_has_noapic_vcpu); 10433 EXPORT_SYMBOL_GPL(kvm_has_noapic_vcpu); 10434 10435 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) 10436 { 10437 struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); 10438 10439 vcpu->arch.l1tf_flush_l1d = true; 10440 if (pmu->version && unlikely(pmu->event_count)) { 10441 pmu->need_cleanup = true; 10442 kvm_make_request(KVM_REQ_PMU, vcpu); 10443 } 10444 static_call(kvm_x86_sched_in)(vcpu, cpu); 10445 } 10446 10447 void kvm_arch_free_vm(struct kvm *kvm) 10448 { 10449 kfree(to_kvm_hv(kvm)->hv_pa_pg); 10450 vfree(kvm); 10451 } 10452 10453 10454 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 10455 { 10456 if (type) 10457 return -EINVAL; 10458 10459 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list); 10460 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); 10461 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); 10462 INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages); 10463 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); 10464 atomic_set(&kvm->arch.noncoherent_dma_count, 0); 10465 10466 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ 10467 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); 10468 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ 10469 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, 10470 &kvm->arch.irq_sources_bitmap); 10471 10472 raw_spin_lock_init(&kvm->arch.tsc_write_lock); 10473 mutex_init(&kvm->arch.apic_map_lock); 10474 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock); 10475 10476 kvm->arch.kvmclock_offset = -get_kvmclock_base_ns(); 10477 pvclock_update_vm_gtod_copy(kvm); 10478 10479 kvm->arch.guest_can_read_msr_platform_info = true; 10480 10481 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn); 10482 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn); 10483 10484 kvm_hv_init_vm(kvm); 10485 kvm_page_track_init(kvm); 10486 kvm_mmu_init_vm(kvm); 10487 10488 return static_call(kvm_x86_vm_init)(kvm); 10489 } 10490 10491 int kvm_arch_post_init_vm(struct kvm *kvm) 10492 { 10493 return kvm_mmu_post_init_vm(kvm); 10494 } 10495 10496 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) 10497 { 10498 vcpu_load(vcpu); 10499 kvm_mmu_unload(vcpu); 10500 vcpu_put(vcpu); 10501 } 10502 10503 static void kvm_free_vcpus(struct kvm *kvm) 10504 { 10505 unsigned int i; 10506 struct kvm_vcpu *vcpu; 10507 10508 /* 10509 * Unpin any mmu pages first. 10510 */ 10511 kvm_for_each_vcpu(i, vcpu, kvm) { 10512 kvm_clear_async_pf_completion_queue(vcpu); 10513 kvm_unload_vcpu_mmu(vcpu); 10514 } 10515 kvm_for_each_vcpu(i, vcpu, kvm) 10516 kvm_vcpu_destroy(vcpu); 10517 10518 mutex_lock(&kvm->lock); 10519 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 10520 kvm->vcpus[i] = NULL; 10521 10522 atomic_set(&kvm->online_vcpus, 0); 10523 mutex_unlock(&kvm->lock); 10524 } 10525 10526 void kvm_arch_sync_events(struct kvm *kvm) 10527 { 10528 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work); 10529 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work); 10530 kvm_free_pit(kvm); 10531 } 10532 10533 #define ERR_PTR_USR(e) ((void __user *)ERR_PTR(e)) 10534 10535 /** 10536 * __x86_set_memory_region: Setup KVM internal memory slot 10537 * 10538 * @kvm: the kvm pointer to the VM. 10539 * @id: the slot ID to setup. 10540 * @gpa: the GPA to install the slot (unused when @size == 0). 10541 * @size: the size of the slot. Set to zero to uninstall a slot. 10542 * 10543 * This function helps to setup a KVM internal memory slot. Specify 10544 * @size > 0 to install a new slot, while @size == 0 to uninstall a 10545 * slot. The return code can be one of the following: 10546 * 10547 * HVA: on success (uninstall will return a bogus HVA) 10548 * -errno: on error 10549 * 10550 * The caller should always use IS_ERR() to check the return value 10551 * before use. Note, the KVM internal memory slots are guaranteed to 10552 * remain valid and unchanged until the VM is destroyed, i.e., the 10553 * GPA->HVA translation will not change. However, the HVA is a user 10554 * address, i.e. its accessibility is not guaranteed, and must be 10555 * accessed via __copy_{to,from}_user(). 10556 */ 10557 void __user * __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, 10558 u32 size) 10559 { 10560 int i, r; 10561 unsigned long hva, old_npages; 10562 struct kvm_memslots *slots = kvm_memslots(kvm); 10563 struct kvm_memory_slot *slot; 10564 10565 /* Called with kvm->slots_lock held. */ 10566 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM)) 10567 return ERR_PTR_USR(-EINVAL); 10568 10569 slot = id_to_memslot(slots, id); 10570 if (size) { 10571 if (slot && slot->npages) 10572 return ERR_PTR_USR(-EEXIST); 10573 10574 /* 10575 * MAP_SHARED to prevent internal slot pages from being moved 10576 * by fork()/COW. 10577 */ 10578 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE, 10579 MAP_SHARED | MAP_ANONYMOUS, 0); 10580 if (IS_ERR((void *)hva)) 10581 return (void __user *)hva; 10582 } else { 10583 if (!slot || !slot->npages) 10584 return 0; 10585 10586 old_npages = slot->npages; 10587 hva = slot->userspace_addr; 10588 } 10589 10590 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 10591 struct kvm_userspace_memory_region m; 10592 10593 m.slot = id | (i << 16); 10594 m.flags = 0; 10595 m.guest_phys_addr = gpa; 10596 m.userspace_addr = hva; 10597 m.memory_size = size; 10598 r = __kvm_set_memory_region(kvm, &m); 10599 if (r < 0) 10600 return ERR_PTR_USR(r); 10601 } 10602 10603 if (!size) 10604 vm_munmap(hva, old_npages * PAGE_SIZE); 10605 10606 return (void __user *)hva; 10607 } 10608 EXPORT_SYMBOL_GPL(__x86_set_memory_region); 10609 10610 void kvm_arch_pre_destroy_vm(struct kvm *kvm) 10611 { 10612 kvm_mmu_pre_destroy_vm(kvm); 10613 } 10614 10615 void kvm_arch_destroy_vm(struct kvm *kvm) 10616 { 10617 u32 i; 10618 10619 if (current->mm == kvm->mm) { 10620 /* 10621 * Free memory regions allocated on behalf of userspace, 10622 * unless the the memory map has changed due to process exit 10623 * or fd copying. 10624 */ 10625 mutex_lock(&kvm->slots_lock); 10626 __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 10627 0, 0); 10628 __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 10629 0, 0); 10630 __x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0); 10631 mutex_unlock(&kvm->slots_lock); 10632 } 10633 static_call_cond(kvm_x86_vm_destroy)(kvm); 10634 for (i = 0; i < kvm->arch.msr_filter.count; i++) 10635 kfree(kvm->arch.msr_filter.ranges[i].bitmap); 10636 kvm_pic_destroy(kvm); 10637 kvm_ioapic_destroy(kvm); 10638 kvm_free_vcpus(kvm); 10639 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); 10640 kfree(srcu_dereference_check(kvm->arch.pmu_event_filter, &kvm->srcu, 1)); 10641 kvm_mmu_uninit_vm(kvm); 10642 kvm_page_track_cleanup(kvm); 10643 kvm_xen_destroy_vm(kvm); 10644 kvm_hv_destroy_vm(kvm); 10645 } 10646 10647 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) 10648 { 10649 int i; 10650 10651 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 10652 kvfree(slot->arch.rmap[i]); 10653 slot->arch.rmap[i] = NULL; 10654 10655 if (i == 0) 10656 continue; 10657 10658 kvfree(slot->arch.lpage_info[i - 1]); 10659 slot->arch.lpage_info[i - 1] = NULL; 10660 } 10661 10662 kvm_page_track_free_memslot(slot); 10663 } 10664 10665 static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot, 10666 unsigned long npages) 10667 { 10668 int i; 10669 10670 /* 10671 * Clear out the previous array pointers for the KVM_MR_MOVE case. The 10672 * old arrays will be freed by __kvm_set_memory_region() if installing 10673 * the new memslot is successful. 10674 */ 10675 memset(&slot->arch, 0, sizeof(slot->arch)); 10676 10677 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 10678 struct kvm_lpage_info *linfo; 10679 unsigned long ugfn; 10680 int lpages; 10681 int level = i + 1; 10682 10683 lpages = gfn_to_index(slot->base_gfn + npages - 1, 10684 slot->base_gfn, level) + 1; 10685 10686 slot->arch.rmap[i] = 10687 kvcalloc(lpages, sizeof(*slot->arch.rmap[i]), 10688 GFP_KERNEL_ACCOUNT); 10689 if (!slot->arch.rmap[i]) 10690 goto out_free; 10691 if (i == 0) 10692 continue; 10693 10694 linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT); 10695 if (!linfo) 10696 goto out_free; 10697 10698 slot->arch.lpage_info[i - 1] = linfo; 10699 10700 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) 10701 linfo[0].disallow_lpage = 1; 10702 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) 10703 linfo[lpages - 1].disallow_lpage = 1; 10704 ugfn = slot->userspace_addr >> PAGE_SHIFT; 10705 /* 10706 * If the gfn and userspace address are not aligned wrt each 10707 * other, disable large page support for this slot. 10708 */ 10709 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1)) { 10710 unsigned long j; 10711 10712 for (j = 0; j < lpages; ++j) 10713 linfo[j].disallow_lpage = 1; 10714 } 10715 } 10716 10717 if (kvm_page_track_create_memslot(slot, npages)) 10718 goto out_free; 10719 10720 return 0; 10721 10722 out_free: 10723 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 10724 kvfree(slot->arch.rmap[i]); 10725 slot->arch.rmap[i] = NULL; 10726 if (i == 0) 10727 continue; 10728 10729 kvfree(slot->arch.lpage_info[i - 1]); 10730 slot->arch.lpage_info[i - 1] = NULL; 10731 } 10732 return -ENOMEM; 10733 } 10734 10735 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) 10736 { 10737 struct kvm_vcpu *vcpu; 10738 int i; 10739 10740 /* 10741 * memslots->generation has been incremented. 10742 * mmio generation may have reached its maximum value. 10743 */ 10744 kvm_mmu_invalidate_mmio_sptes(kvm, gen); 10745 10746 /* Force re-initialization of steal_time cache */ 10747 kvm_for_each_vcpu(i, vcpu, kvm) 10748 kvm_vcpu_kick(vcpu); 10749 } 10750 10751 int kvm_arch_prepare_memory_region(struct kvm *kvm, 10752 struct kvm_memory_slot *memslot, 10753 const struct kvm_userspace_memory_region *mem, 10754 enum kvm_mr_change change) 10755 { 10756 if (change == KVM_MR_CREATE || change == KVM_MR_MOVE) 10757 return kvm_alloc_memslot_metadata(memslot, 10758 mem->memory_size >> PAGE_SHIFT); 10759 return 0; 10760 } 10761 10762 10763 static void kvm_mmu_update_cpu_dirty_logging(struct kvm *kvm, bool enable) 10764 { 10765 struct kvm_arch *ka = &kvm->arch; 10766 10767 if (!kvm_x86_ops.cpu_dirty_log_size) 10768 return; 10769 10770 if ((enable && ++ka->cpu_dirty_logging_count == 1) || 10771 (!enable && --ka->cpu_dirty_logging_count == 0)) 10772 kvm_make_all_cpus_request(kvm, KVM_REQ_UPDATE_CPU_DIRTY_LOGGING); 10773 10774 WARN_ON_ONCE(ka->cpu_dirty_logging_count < 0); 10775 } 10776 10777 static void kvm_mmu_slot_apply_flags(struct kvm *kvm, 10778 struct kvm_memory_slot *old, 10779 struct kvm_memory_slot *new, 10780 enum kvm_mr_change change) 10781 { 10782 bool log_dirty_pages = new->flags & KVM_MEM_LOG_DIRTY_PAGES; 10783 10784 /* 10785 * Update CPU dirty logging if dirty logging is being toggled. This 10786 * applies to all operations. 10787 */ 10788 if ((old->flags ^ new->flags) & KVM_MEM_LOG_DIRTY_PAGES) 10789 kvm_mmu_update_cpu_dirty_logging(kvm, log_dirty_pages); 10790 10791 /* 10792 * Nothing more to do for RO slots (which can't be dirtied and can't be 10793 * made writable) or CREATE/MOVE/DELETE of a slot. 10794 * 10795 * For a memslot with dirty logging disabled: 10796 * CREATE: No dirty mappings will already exist. 10797 * MOVE/DELETE: The old mappings will already have been cleaned up by 10798 * kvm_arch_flush_shadow_memslot() 10799 * 10800 * For a memslot with dirty logging enabled: 10801 * CREATE: No shadow pages exist, thus nothing to write-protect 10802 * and no dirty bits to clear. 10803 * MOVE/DELETE: The old mappings will already have been cleaned up by 10804 * kvm_arch_flush_shadow_memslot(). 10805 */ 10806 if ((change != KVM_MR_FLAGS_ONLY) || (new->flags & KVM_MEM_READONLY)) 10807 return; 10808 10809 /* 10810 * READONLY and non-flags changes were filtered out above, and the only 10811 * other flag is LOG_DIRTY_PAGES, i.e. something is wrong if dirty 10812 * logging isn't being toggled on or off. 10813 */ 10814 if (WARN_ON_ONCE(!((old->flags ^ new->flags) & KVM_MEM_LOG_DIRTY_PAGES))) 10815 return; 10816 10817 if (!log_dirty_pages) { 10818 /* 10819 * Dirty logging tracks sptes in 4k granularity, meaning that 10820 * large sptes have to be split. If live migration succeeds, 10821 * the guest in the source machine will be destroyed and large 10822 * sptes will be created in the destination. However, if the 10823 * guest continues to run in the source machine (for example if 10824 * live migration fails), small sptes will remain around and 10825 * cause bad performance. 10826 * 10827 * Scan sptes if dirty logging has been stopped, dropping those 10828 * which can be collapsed into a single large-page spte. Later 10829 * page faults will create the large-page sptes. 10830 */ 10831 kvm_mmu_zap_collapsible_sptes(kvm, new); 10832 } else { 10833 /* By default, write-protect everything to log writes. */ 10834 int level = PG_LEVEL_4K; 10835 10836 if (kvm_x86_ops.cpu_dirty_log_size) { 10837 /* 10838 * Clear all dirty bits, unless pages are treated as 10839 * dirty from the get-go. 10840 */ 10841 if (!kvm_dirty_log_manual_protect_and_init_set(kvm)) 10842 kvm_mmu_slot_leaf_clear_dirty(kvm, new); 10843 10844 /* 10845 * Write-protect large pages on write so that dirty 10846 * logging happens at 4k granularity. No need to 10847 * write-protect small SPTEs since write accesses are 10848 * logged by the CPU via dirty bits. 10849 */ 10850 level = PG_LEVEL_2M; 10851 } else if (kvm_dirty_log_manual_protect_and_init_set(kvm)) { 10852 /* 10853 * If we're with initial-all-set, we don't need 10854 * to write protect any small page because 10855 * they're reported as dirty already. However 10856 * we still need to write-protect huge pages 10857 * so that the page split can happen lazily on 10858 * the first write to the huge page. 10859 */ 10860 level = PG_LEVEL_2M; 10861 } 10862 kvm_mmu_slot_remove_write_access(kvm, new, level); 10863 } 10864 } 10865 10866 void kvm_arch_commit_memory_region(struct kvm *kvm, 10867 const struct kvm_userspace_memory_region *mem, 10868 struct kvm_memory_slot *old, 10869 const struct kvm_memory_slot *new, 10870 enum kvm_mr_change change) 10871 { 10872 if (!kvm->arch.n_requested_mmu_pages) 10873 kvm_mmu_change_mmu_pages(kvm, 10874 kvm_mmu_calculate_default_mmu_pages(kvm)); 10875 10876 /* 10877 * FIXME: const-ify all uses of struct kvm_memory_slot. 10878 */ 10879 kvm_mmu_slot_apply_flags(kvm, old, (struct kvm_memory_slot *) new, change); 10880 10881 /* Free the arrays associated with the old memslot. */ 10882 if (change == KVM_MR_MOVE) 10883 kvm_arch_free_memslot(kvm, old); 10884 } 10885 10886 void kvm_arch_flush_shadow_all(struct kvm *kvm) 10887 { 10888 kvm_mmu_zap_all(kvm); 10889 } 10890 10891 void kvm_arch_flush_shadow_memslot(struct kvm *kvm, 10892 struct kvm_memory_slot *slot) 10893 { 10894 kvm_page_track_flush_slot(kvm, slot); 10895 } 10896 10897 static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) 10898 { 10899 return (is_guest_mode(vcpu) && 10900 kvm_x86_ops.guest_apic_has_interrupt && 10901 static_call(kvm_x86_guest_apic_has_interrupt)(vcpu)); 10902 } 10903 10904 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) 10905 { 10906 if (!list_empty_careful(&vcpu->async_pf.done)) 10907 return true; 10908 10909 if (kvm_apic_has_events(vcpu)) 10910 return true; 10911 10912 if (vcpu->arch.pv.pv_unhalted) 10913 return true; 10914 10915 if (vcpu->arch.exception.pending) 10916 return true; 10917 10918 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 10919 (vcpu->arch.nmi_pending && 10920 static_call(kvm_x86_nmi_allowed)(vcpu, false))) 10921 return true; 10922 10923 if (kvm_test_request(KVM_REQ_SMI, vcpu) || 10924 (vcpu->arch.smi_pending && 10925 static_call(kvm_x86_smi_allowed)(vcpu, false))) 10926 return true; 10927 10928 if (kvm_arch_interrupt_allowed(vcpu) && 10929 (kvm_cpu_has_interrupt(vcpu) || 10930 kvm_guest_apic_has_interrupt(vcpu))) 10931 return true; 10932 10933 if (kvm_hv_has_stimer_pending(vcpu)) 10934 return true; 10935 10936 if (is_guest_mode(vcpu) && 10937 kvm_x86_ops.nested_ops->hv_timer_pending && 10938 kvm_x86_ops.nested_ops->hv_timer_pending(vcpu)) 10939 return true; 10940 10941 return false; 10942 } 10943 10944 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 10945 { 10946 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu); 10947 } 10948 10949 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) 10950 { 10951 if (READ_ONCE(vcpu->arch.pv.pv_unhalted)) 10952 return true; 10953 10954 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 10955 kvm_test_request(KVM_REQ_SMI, vcpu) || 10956 kvm_test_request(KVM_REQ_EVENT, vcpu)) 10957 return true; 10958 10959 if (vcpu->arch.apicv_active && static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu)) 10960 return true; 10961 10962 return false; 10963 } 10964 10965 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 10966 { 10967 return vcpu->arch.preempted_in_kernel; 10968 } 10969 10970 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 10971 { 10972 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 10973 } 10974 10975 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) 10976 { 10977 return static_call(kvm_x86_interrupt_allowed)(vcpu, false); 10978 } 10979 10980 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu) 10981 { 10982 /* Can't read the RIP when guest state is protected, just return 0 */ 10983 if (vcpu->arch.guest_state_protected) 10984 return 0; 10985 10986 if (is_64_bit_mode(vcpu)) 10987 return kvm_rip_read(vcpu); 10988 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) + 10989 kvm_rip_read(vcpu)); 10990 } 10991 EXPORT_SYMBOL_GPL(kvm_get_linear_rip); 10992 10993 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip) 10994 { 10995 return kvm_get_linear_rip(vcpu) == linear_rip; 10996 } 10997 EXPORT_SYMBOL_GPL(kvm_is_linear_rip); 10998 10999 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) 11000 { 11001 unsigned long rflags; 11002 11003 rflags = static_call(kvm_x86_get_rflags)(vcpu); 11004 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 11005 rflags &= ~X86_EFLAGS_TF; 11006 return rflags; 11007 } 11008 EXPORT_SYMBOL_GPL(kvm_get_rflags); 11009 11010 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 11011 { 11012 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && 11013 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip)) 11014 rflags |= X86_EFLAGS_TF; 11015 static_call(kvm_x86_set_rflags)(vcpu, rflags); 11016 } 11017 11018 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 11019 { 11020 __kvm_set_rflags(vcpu, rflags); 11021 kvm_make_request(KVM_REQ_EVENT, vcpu); 11022 } 11023 EXPORT_SYMBOL_GPL(kvm_set_rflags); 11024 11025 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work) 11026 { 11027 int r; 11028 11029 if ((vcpu->arch.mmu->direct_map != work->arch.direct_map) || 11030 work->wakeup_all) 11031 return; 11032 11033 r = kvm_mmu_reload(vcpu); 11034 if (unlikely(r)) 11035 return; 11036 11037 if (!vcpu->arch.mmu->direct_map && 11038 work->arch.cr3 != vcpu->arch.mmu->get_guest_pgd(vcpu)) 11039 return; 11040 11041 kvm_mmu_do_page_fault(vcpu, work->cr2_or_gpa, 0, true); 11042 } 11043 11044 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) 11045 { 11046 BUILD_BUG_ON(!is_power_of_2(ASYNC_PF_PER_VCPU)); 11047 11048 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); 11049 } 11050 11051 static inline u32 kvm_async_pf_next_probe(u32 key) 11052 { 11053 return (key + 1) & (ASYNC_PF_PER_VCPU - 1); 11054 } 11055 11056 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 11057 { 11058 u32 key = kvm_async_pf_hash_fn(gfn); 11059 11060 while (vcpu->arch.apf.gfns[key] != ~0) 11061 key = kvm_async_pf_next_probe(key); 11062 11063 vcpu->arch.apf.gfns[key] = gfn; 11064 } 11065 11066 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) 11067 { 11068 int i; 11069 u32 key = kvm_async_pf_hash_fn(gfn); 11070 11071 for (i = 0; i < ASYNC_PF_PER_VCPU && 11072 (vcpu->arch.apf.gfns[key] != gfn && 11073 vcpu->arch.apf.gfns[key] != ~0); i++) 11074 key = kvm_async_pf_next_probe(key); 11075 11076 return key; 11077 } 11078 11079 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 11080 { 11081 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; 11082 } 11083 11084 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 11085 { 11086 u32 i, j, k; 11087 11088 i = j = kvm_async_pf_gfn_slot(vcpu, gfn); 11089 11090 if (WARN_ON_ONCE(vcpu->arch.apf.gfns[i] != gfn)) 11091 return; 11092 11093 while (true) { 11094 vcpu->arch.apf.gfns[i] = ~0; 11095 do { 11096 j = kvm_async_pf_next_probe(j); 11097 if (vcpu->arch.apf.gfns[j] == ~0) 11098 return; 11099 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); 11100 /* 11101 * k lies cyclically in ]i,j] 11102 * | i.k.j | 11103 * |....j i.k.| or |.k..j i...| 11104 */ 11105 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); 11106 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; 11107 i = j; 11108 } 11109 } 11110 11111 static inline int apf_put_user_notpresent(struct kvm_vcpu *vcpu) 11112 { 11113 u32 reason = KVM_PV_REASON_PAGE_NOT_PRESENT; 11114 11115 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &reason, 11116 sizeof(reason)); 11117 } 11118 11119 static inline int apf_put_user_ready(struct kvm_vcpu *vcpu, u32 token) 11120 { 11121 unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token); 11122 11123 return kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data, 11124 &token, offset, sizeof(token)); 11125 } 11126 11127 static inline bool apf_pageready_slot_free(struct kvm_vcpu *vcpu) 11128 { 11129 unsigned int offset = offsetof(struct kvm_vcpu_pv_apf_data, token); 11130 u32 val; 11131 11132 if (kvm_read_guest_offset_cached(vcpu->kvm, &vcpu->arch.apf.data, 11133 &val, offset, sizeof(val))) 11134 return false; 11135 11136 return !val; 11137 } 11138 11139 static bool kvm_can_deliver_async_pf(struct kvm_vcpu *vcpu) 11140 { 11141 if (!vcpu->arch.apf.delivery_as_pf_vmexit && is_guest_mode(vcpu)) 11142 return false; 11143 11144 if (!kvm_pv_async_pf_enabled(vcpu) || 11145 (vcpu->arch.apf.send_user_only && static_call(kvm_x86_get_cpl)(vcpu) == 0)) 11146 return false; 11147 11148 return true; 11149 } 11150 11151 bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu) 11152 { 11153 if (unlikely(!lapic_in_kernel(vcpu) || 11154 kvm_event_needs_reinjection(vcpu) || 11155 vcpu->arch.exception.pending)) 11156 return false; 11157 11158 if (kvm_hlt_in_guest(vcpu->kvm) && !kvm_can_deliver_async_pf(vcpu)) 11159 return false; 11160 11161 /* 11162 * If interrupts are off we cannot even use an artificial 11163 * halt state. 11164 */ 11165 return kvm_arch_interrupt_allowed(vcpu); 11166 } 11167 11168 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 11169 struct kvm_async_pf *work) 11170 { 11171 struct x86_exception fault; 11172 11173 trace_kvm_async_pf_not_present(work->arch.token, work->cr2_or_gpa); 11174 kvm_add_async_pf_gfn(vcpu, work->arch.gfn); 11175 11176 if (kvm_can_deliver_async_pf(vcpu) && 11177 !apf_put_user_notpresent(vcpu)) { 11178 fault.vector = PF_VECTOR; 11179 fault.error_code_valid = true; 11180 fault.error_code = 0; 11181 fault.nested_page_fault = false; 11182 fault.address = work->arch.token; 11183 fault.async_page_fault = true; 11184 kvm_inject_page_fault(vcpu, &fault); 11185 return true; 11186 } else { 11187 /* 11188 * It is not possible to deliver a paravirtualized asynchronous 11189 * page fault, but putting the guest in an artificial halt state 11190 * can be beneficial nevertheless: if an interrupt arrives, we 11191 * can deliver it timely and perhaps the guest will schedule 11192 * another process. When the instruction that triggered a page 11193 * fault is retried, hopefully the page will be ready in the host. 11194 */ 11195 kvm_make_request(KVM_REQ_APF_HALT, vcpu); 11196 return false; 11197 } 11198 } 11199 11200 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 11201 struct kvm_async_pf *work) 11202 { 11203 struct kvm_lapic_irq irq = { 11204 .delivery_mode = APIC_DM_FIXED, 11205 .vector = vcpu->arch.apf.vec 11206 }; 11207 11208 if (work->wakeup_all) 11209 work->arch.token = ~0; /* broadcast wakeup */ 11210 else 11211 kvm_del_async_pf_gfn(vcpu, work->arch.gfn); 11212 trace_kvm_async_pf_ready(work->arch.token, work->cr2_or_gpa); 11213 11214 if ((work->wakeup_all || work->notpresent_injected) && 11215 kvm_pv_async_pf_enabled(vcpu) && 11216 !apf_put_user_ready(vcpu, work->arch.token)) { 11217 vcpu->arch.apf.pageready_pending = true; 11218 kvm_apic_set_irq(vcpu, &irq, NULL); 11219 } 11220 11221 vcpu->arch.apf.halted = false; 11222 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 11223 } 11224 11225 void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu) 11226 { 11227 kvm_make_request(KVM_REQ_APF_READY, vcpu); 11228 if (!vcpu->arch.apf.pageready_pending) 11229 kvm_vcpu_kick(vcpu); 11230 } 11231 11232 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) 11233 { 11234 if (!kvm_pv_async_pf_enabled(vcpu)) 11235 return true; 11236 else 11237 return apf_pageready_slot_free(vcpu); 11238 } 11239 11240 void kvm_arch_start_assignment(struct kvm *kvm) 11241 { 11242 atomic_inc(&kvm->arch.assigned_device_count); 11243 } 11244 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment); 11245 11246 void kvm_arch_end_assignment(struct kvm *kvm) 11247 { 11248 atomic_dec(&kvm->arch.assigned_device_count); 11249 } 11250 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment); 11251 11252 bool kvm_arch_has_assigned_device(struct kvm *kvm) 11253 { 11254 return atomic_read(&kvm->arch.assigned_device_count); 11255 } 11256 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); 11257 11258 void kvm_arch_register_noncoherent_dma(struct kvm *kvm) 11259 { 11260 atomic_inc(&kvm->arch.noncoherent_dma_count); 11261 } 11262 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma); 11263 11264 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm) 11265 { 11266 atomic_dec(&kvm->arch.noncoherent_dma_count); 11267 } 11268 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma); 11269 11270 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm) 11271 { 11272 return atomic_read(&kvm->arch.noncoherent_dma_count); 11273 } 11274 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma); 11275 11276 bool kvm_arch_has_irq_bypass(void) 11277 { 11278 return true; 11279 } 11280 11281 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, 11282 struct irq_bypass_producer *prod) 11283 { 11284 struct kvm_kernel_irqfd *irqfd = 11285 container_of(cons, struct kvm_kernel_irqfd, consumer); 11286 int ret; 11287 11288 irqfd->producer = prod; 11289 kvm_arch_start_assignment(irqfd->kvm); 11290 ret = static_call(kvm_x86_update_pi_irte)(irqfd->kvm, 11291 prod->irq, irqfd->gsi, 1); 11292 11293 if (ret) 11294 kvm_arch_end_assignment(irqfd->kvm); 11295 11296 return ret; 11297 } 11298 11299 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, 11300 struct irq_bypass_producer *prod) 11301 { 11302 int ret; 11303 struct kvm_kernel_irqfd *irqfd = 11304 container_of(cons, struct kvm_kernel_irqfd, consumer); 11305 11306 WARN_ON(irqfd->producer != prod); 11307 irqfd->producer = NULL; 11308 11309 /* 11310 * When producer of consumer is unregistered, we change back to 11311 * remapped mode, so we can re-use the current implementation 11312 * when the irq is masked/disabled or the consumer side (KVM 11313 * int this case doesn't want to receive the interrupts. 11314 */ 11315 ret = static_call(kvm_x86_update_pi_irte)(irqfd->kvm, prod->irq, irqfd->gsi, 0); 11316 if (ret) 11317 printk(KERN_INFO "irq bypass consumer (token %p) unregistration" 11318 " fails: %d\n", irqfd->consumer.token, ret); 11319 11320 kvm_arch_end_assignment(irqfd->kvm); 11321 } 11322 11323 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq, 11324 uint32_t guest_irq, bool set) 11325 { 11326 return static_call(kvm_x86_update_pi_irte)(kvm, host_irq, guest_irq, set); 11327 } 11328 11329 bool kvm_vector_hashing_enabled(void) 11330 { 11331 return vector_hashing; 11332 } 11333 11334 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 11335 { 11336 return (vcpu->arch.msr_kvm_poll_control & 1) == 0; 11337 } 11338 EXPORT_SYMBOL_GPL(kvm_arch_no_poll); 11339 11340 11341 int kvm_spec_ctrl_test_value(u64 value) 11342 { 11343 /* 11344 * test that setting IA32_SPEC_CTRL to given value 11345 * is allowed by the host processor 11346 */ 11347 11348 u64 saved_value; 11349 unsigned long flags; 11350 int ret = 0; 11351 11352 local_irq_save(flags); 11353 11354 if (rdmsrl_safe(MSR_IA32_SPEC_CTRL, &saved_value)) 11355 ret = 1; 11356 else if (wrmsrl_safe(MSR_IA32_SPEC_CTRL, value)) 11357 ret = 1; 11358 else 11359 wrmsrl(MSR_IA32_SPEC_CTRL, saved_value); 11360 11361 local_irq_restore(flags); 11362 11363 return ret; 11364 } 11365 EXPORT_SYMBOL_GPL(kvm_spec_ctrl_test_value); 11366 11367 void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_code) 11368 { 11369 struct x86_exception fault; 11370 u32 access = error_code & 11371 (PFERR_WRITE_MASK | PFERR_FETCH_MASK | PFERR_USER_MASK); 11372 11373 if (!(error_code & PFERR_PRESENT_MASK) || 11374 vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, &fault) != UNMAPPED_GVA) { 11375 /* 11376 * If vcpu->arch.walk_mmu->gva_to_gpa succeeded, the page 11377 * tables probably do not match the TLB. Just proceed 11378 * with the error code that the processor gave. 11379 */ 11380 fault.vector = PF_VECTOR; 11381 fault.error_code_valid = true; 11382 fault.error_code = error_code; 11383 fault.nested_page_fault = false; 11384 fault.address = gva; 11385 } 11386 vcpu->arch.walk_mmu->inject_page_fault(vcpu, &fault); 11387 } 11388 EXPORT_SYMBOL_GPL(kvm_fixup_and_inject_pf_error); 11389 11390 /* 11391 * Handles kvm_read/write_guest_virt*() result and either injects #PF or returns 11392 * KVM_EXIT_INTERNAL_ERROR for cases not currently handled by KVM. Return value 11393 * indicates whether exit to userspace is needed. 11394 */ 11395 int kvm_handle_memory_failure(struct kvm_vcpu *vcpu, int r, 11396 struct x86_exception *e) 11397 { 11398 if (r == X86EMUL_PROPAGATE_FAULT) { 11399 kvm_inject_emulated_page_fault(vcpu, e); 11400 return 1; 11401 } 11402 11403 /* 11404 * In case kvm_read/write_guest_virt*() failed with X86EMUL_IO_NEEDED 11405 * while handling a VMX instruction KVM could've handled the request 11406 * correctly by exiting to userspace and performing I/O but there 11407 * doesn't seem to be a real use-case behind such requests, just return 11408 * KVM_EXIT_INTERNAL_ERROR for now. 11409 */ 11410 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 11411 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 11412 vcpu->run->internal.ndata = 0; 11413 11414 return 0; 11415 } 11416 EXPORT_SYMBOL_GPL(kvm_handle_memory_failure); 11417 11418 int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva) 11419 { 11420 bool pcid_enabled; 11421 struct x86_exception e; 11422 unsigned i; 11423 unsigned long roots_to_free = 0; 11424 struct { 11425 u64 pcid; 11426 u64 gla; 11427 } operand; 11428 int r; 11429 11430 r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e); 11431 if (r != X86EMUL_CONTINUE) 11432 return kvm_handle_memory_failure(vcpu, r, &e); 11433 11434 if (operand.pcid >> 12 != 0) { 11435 kvm_inject_gp(vcpu, 0); 11436 return 1; 11437 } 11438 11439 pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); 11440 11441 switch (type) { 11442 case INVPCID_TYPE_INDIV_ADDR: 11443 if ((!pcid_enabled && (operand.pcid != 0)) || 11444 is_noncanonical_address(operand.gla, vcpu)) { 11445 kvm_inject_gp(vcpu, 0); 11446 return 1; 11447 } 11448 kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid); 11449 return kvm_skip_emulated_instruction(vcpu); 11450 11451 case INVPCID_TYPE_SINGLE_CTXT: 11452 if (!pcid_enabled && (operand.pcid != 0)) { 11453 kvm_inject_gp(vcpu, 0); 11454 return 1; 11455 } 11456 11457 if (kvm_get_active_pcid(vcpu) == operand.pcid) { 11458 kvm_mmu_sync_roots(vcpu); 11459 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 11460 } 11461 11462 for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) 11463 if (kvm_get_pcid(vcpu, vcpu->arch.mmu->prev_roots[i].pgd) 11464 == operand.pcid) 11465 roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); 11466 11467 kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, roots_to_free); 11468 /* 11469 * If neither the current cr3 nor any of the prev_roots use the 11470 * given PCID, then nothing needs to be done here because a 11471 * resync will happen anyway before switching to any other CR3. 11472 */ 11473 11474 return kvm_skip_emulated_instruction(vcpu); 11475 11476 case INVPCID_TYPE_ALL_NON_GLOBAL: 11477 /* 11478 * Currently, KVM doesn't mark global entries in the shadow 11479 * page tables, so a non-global flush just degenerates to a 11480 * global flush. If needed, we could optimize this later by 11481 * keeping track of global entries in shadow page tables. 11482 */ 11483 11484 fallthrough; 11485 case INVPCID_TYPE_ALL_INCL_GLOBAL: 11486 kvm_mmu_unload(vcpu); 11487 return kvm_skip_emulated_instruction(vcpu); 11488 11489 default: 11490 BUG(); /* We have already checked above that type <= 3 */ 11491 } 11492 } 11493 EXPORT_SYMBOL_GPL(kvm_handle_invpcid); 11494 11495 static int complete_sev_es_emulated_mmio(struct kvm_vcpu *vcpu) 11496 { 11497 struct kvm_run *run = vcpu->run; 11498 struct kvm_mmio_fragment *frag; 11499 unsigned int len; 11500 11501 BUG_ON(!vcpu->mmio_needed); 11502 11503 /* Complete previous fragment */ 11504 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment]; 11505 len = min(8u, frag->len); 11506 if (!vcpu->mmio_is_write) 11507 memcpy(frag->data, run->mmio.data, len); 11508 11509 if (frag->len <= 8) { 11510 /* Switch to the next fragment. */ 11511 frag++; 11512 vcpu->mmio_cur_fragment++; 11513 } else { 11514 /* Go forward to the next mmio piece. */ 11515 frag->data += len; 11516 frag->gpa += len; 11517 frag->len -= len; 11518 } 11519 11520 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) { 11521 vcpu->mmio_needed = 0; 11522 11523 // VMG change, at this point, we're always done 11524 // RIP has already been advanced 11525 return 1; 11526 } 11527 11528 // More MMIO is needed 11529 run->mmio.phys_addr = frag->gpa; 11530 run->mmio.len = min(8u, frag->len); 11531 run->mmio.is_write = vcpu->mmio_is_write; 11532 if (run->mmio.is_write) 11533 memcpy(run->mmio.data, frag->data, min(8u, frag->len)); 11534 run->exit_reason = KVM_EXIT_MMIO; 11535 11536 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio; 11537 11538 return 0; 11539 } 11540 11541 int kvm_sev_es_mmio_write(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes, 11542 void *data) 11543 { 11544 int handled; 11545 struct kvm_mmio_fragment *frag; 11546 11547 if (!data) 11548 return -EINVAL; 11549 11550 handled = write_emultor.read_write_mmio(vcpu, gpa, bytes, data); 11551 if (handled == bytes) 11552 return 1; 11553 11554 bytes -= handled; 11555 gpa += handled; 11556 data += handled; 11557 11558 /*TODO: Check if need to increment number of frags */ 11559 frag = vcpu->mmio_fragments; 11560 vcpu->mmio_nr_fragments = 1; 11561 frag->len = bytes; 11562 frag->gpa = gpa; 11563 frag->data = data; 11564 11565 vcpu->mmio_needed = 1; 11566 vcpu->mmio_cur_fragment = 0; 11567 11568 vcpu->run->mmio.phys_addr = gpa; 11569 vcpu->run->mmio.len = min(8u, frag->len); 11570 vcpu->run->mmio.is_write = 1; 11571 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len)); 11572 vcpu->run->exit_reason = KVM_EXIT_MMIO; 11573 11574 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio; 11575 11576 return 0; 11577 } 11578 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_write); 11579 11580 int kvm_sev_es_mmio_read(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes, 11581 void *data) 11582 { 11583 int handled; 11584 struct kvm_mmio_fragment *frag; 11585 11586 if (!data) 11587 return -EINVAL; 11588 11589 handled = read_emultor.read_write_mmio(vcpu, gpa, bytes, data); 11590 if (handled == bytes) 11591 return 1; 11592 11593 bytes -= handled; 11594 gpa += handled; 11595 data += handled; 11596 11597 /*TODO: Check if need to increment number of frags */ 11598 frag = vcpu->mmio_fragments; 11599 vcpu->mmio_nr_fragments = 1; 11600 frag->len = bytes; 11601 frag->gpa = gpa; 11602 frag->data = data; 11603 11604 vcpu->mmio_needed = 1; 11605 vcpu->mmio_cur_fragment = 0; 11606 11607 vcpu->run->mmio.phys_addr = gpa; 11608 vcpu->run->mmio.len = min(8u, frag->len); 11609 vcpu->run->mmio.is_write = 0; 11610 vcpu->run->exit_reason = KVM_EXIT_MMIO; 11611 11612 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_mmio; 11613 11614 return 0; 11615 } 11616 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_read); 11617 11618 static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu) 11619 { 11620 memcpy(vcpu->arch.guest_ins_data, vcpu->arch.pio_data, 11621 vcpu->arch.pio.count * vcpu->arch.pio.size); 11622 vcpu->arch.pio.count = 0; 11623 11624 return 1; 11625 } 11626 11627 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size, 11628 unsigned int port, void *data, unsigned int count) 11629 { 11630 int ret; 11631 11632 ret = emulator_pio_out_emulated(vcpu->arch.emulate_ctxt, size, port, 11633 data, count); 11634 if (ret) 11635 return ret; 11636 11637 vcpu->arch.pio.count = 0; 11638 11639 return 0; 11640 } 11641 11642 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size, 11643 unsigned int port, void *data, unsigned int count) 11644 { 11645 int ret; 11646 11647 ret = emulator_pio_in_emulated(vcpu->arch.emulate_ctxt, size, port, 11648 data, count); 11649 if (ret) { 11650 vcpu->arch.pio.count = 0; 11651 } else { 11652 vcpu->arch.guest_ins_data = data; 11653 vcpu->arch.complete_userspace_io = complete_sev_es_emulated_ins; 11654 } 11655 11656 return 0; 11657 } 11658 11659 int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size, 11660 unsigned int port, void *data, unsigned int count, 11661 int in) 11662 { 11663 return in ? kvm_sev_es_ins(vcpu, size, port, data, count) 11664 : kvm_sev_es_outs(vcpu, size, port, data, count); 11665 } 11666 EXPORT_SYMBOL_GPL(kvm_sev_es_string_io); 11667 11668 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_entry); 11669 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); 11670 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio); 11671 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); 11672 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); 11673 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); 11674 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); 11675 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); 11676 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); 11677 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); 11678 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); 11679 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed); 11680 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); 11681 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit); 11682 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts); 11683 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset); 11684 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window_update); 11685 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full); 11686 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update); 11687 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access); 11688 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi); 11689 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log); 11690 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request); 11691 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter); 11692 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit); 11693 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter); 11694 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit); 11695