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 "mmu.h" 22 #include "i8254.h" 23 #include "tss.h" 24 #include "kvm_cache_regs.h" 25 #include "x86.h" 26 #include "cpuid.h" 27 #include "pmu.h" 28 #include "hyperv.h" 29 30 #include <linux/clocksource.h> 31 #include <linux/interrupt.h> 32 #include <linux/kvm.h> 33 #include <linux/fs.h> 34 #include <linux/vmalloc.h> 35 #include <linux/export.h> 36 #include <linux/moduleparam.h> 37 #include <linux/mman.h> 38 #include <linux/highmem.h> 39 #include <linux/iommu.h> 40 #include <linux/intel-iommu.h> 41 #include <linux/cpufreq.h> 42 #include <linux/user-return-notifier.h> 43 #include <linux/srcu.h> 44 #include <linux/slab.h> 45 #include <linux/perf_event.h> 46 #include <linux/uaccess.h> 47 #include <linux/hash.h> 48 #include <linux/pci.h> 49 #include <linux/timekeeper_internal.h> 50 #include <linux/pvclock_gtod.h> 51 #include <linux/kvm_irqfd.h> 52 #include <linux/irqbypass.h> 53 #include <linux/sched/stat.h> 54 #include <linux/sched/isolation.h> 55 #include <linux/mem_encrypt.h> 56 57 #include <trace/events/kvm.h> 58 59 #include <asm/debugreg.h> 60 #include <asm/msr.h> 61 #include <asm/desc.h> 62 #include <asm/mce.h> 63 #include <linux/kernel_stat.h> 64 #include <asm/fpu/internal.h> /* Ugh! */ 65 #include <asm/pvclock.h> 66 #include <asm/div64.h> 67 #include <asm/irq_remapping.h> 68 #include <asm/mshyperv.h> 69 #include <asm/hypervisor.h> 70 #include <asm/intel_pt.h> 71 #include <clocksource/hyperv_timer.h> 72 73 #define CREATE_TRACE_POINTS 74 #include "trace.h" 75 76 #define MAX_IO_MSRS 256 77 #define KVM_MAX_MCE_BANKS 32 78 u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P; 79 EXPORT_SYMBOL_GPL(kvm_mce_cap_supported); 80 81 #define emul_to_vcpu(ctxt) \ 82 container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt) 83 84 /* EFER defaults: 85 * - enable syscall per default because its emulated by KVM 86 * - enable LME and LMA per default on 64 bit KVM 87 */ 88 #ifdef CONFIG_X86_64 89 static 90 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); 91 #else 92 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE); 93 #endif 94 95 #define VM_STAT(x, ...) offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ 96 #define VCPU_STAT(x, ...) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ 97 98 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \ 99 KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 100 101 static void update_cr8_intercept(struct kvm_vcpu *vcpu); 102 static void process_nmi(struct kvm_vcpu *vcpu); 103 static void enter_smm(struct kvm_vcpu *vcpu); 104 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); 105 static void store_regs(struct kvm_vcpu *vcpu); 106 static int sync_regs(struct kvm_vcpu *vcpu); 107 108 struct kvm_x86_ops *kvm_x86_ops __read_mostly; 109 EXPORT_SYMBOL_GPL(kvm_x86_ops); 110 111 static bool __read_mostly ignore_msrs = 0; 112 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR); 113 114 static bool __read_mostly report_ignored_msrs = true; 115 module_param(report_ignored_msrs, bool, S_IRUGO | S_IWUSR); 116 117 unsigned int min_timer_period_us = 200; 118 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR); 119 120 static bool __read_mostly kvmclock_periodic_sync = true; 121 module_param(kvmclock_periodic_sync, bool, S_IRUGO); 122 123 bool __read_mostly kvm_has_tsc_control; 124 EXPORT_SYMBOL_GPL(kvm_has_tsc_control); 125 u32 __read_mostly kvm_max_guest_tsc_khz; 126 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); 127 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits; 128 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits); 129 u64 __read_mostly kvm_max_tsc_scaling_ratio; 130 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio); 131 u64 __read_mostly kvm_default_tsc_scaling_ratio; 132 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio); 133 134 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */ 135 static u32 __read_mostly tsc_tolerance_ppm = 250; 136 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR); 137 138 /* 139 * lapic timer advance (tscdeadline mode only) in nanoseconds. '-1' enables 140 * adaptive tuning starting from default advancment of 1000ns. '0' disables 141 * advancement entirely. Any other value is used as-is and disables adaptive 142 * tuning, i.e. allows priveleged userspace to set an exact advancement time. 143 */ 144 static int __read_mostly lapic_timer_advance_ns = -1; 145 module_param(lapic_timer_advance_ns, int, S_IRUGO | S_IWUSR); 146 147 static bool __read_mostly vector_hashing = true; 148 module_param(vector_hashing, bool, S_IRUGO); 149 150 bool __read_mostly enable_vmware_backdoor = false; 151 module_param(enable_vmware_backdoor, bool, S_IRUGO); 152 EXPORT_SYMBOL_GPL(enable_vmware_backdoor); 153 154 static bool __read_mostly force_emulation_prefix = false; 155 module_param(force_emulation_prefix, bool, S_IRUGO); 156 157 int __read_mostly pi_inject_timer = -1; 158 module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR); 159 160 #define KVM_NR_SHARED_MSRS 16 161 162 struct kvm_shared_msrs_global { 163 int nr; 164 u32 msrs[KVM_NR_SHARED_MSRS]; 165 }; 166 167 struct kvm_shared_msrs { 168 struct user_return_notifier urn; 169 bool registered; 170 struct kvm_shared_msr_values { 171 u64 host; 172 u64 curr; 173 } values[KVM_NR_SHARED_MSRS]; 174 }; 175 176 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; 177 static struct kvm_shared_msrs __percpu *shared_msrs; 178 179 struct kvm_stats_debugfs_item debugfs_entries[] = { 180 { "pf_fixed", VCPU_STAT(pf_fixed) }, 181 { "pf_guest", VCPU_STAT(pf_guest) }, 182 { "tlb_flush", VCPU_STAT(tlb_flush) }, 183 { "invlpg", VCPU_STAT(invlpg) }, 184 { "exits", VCPU_STAT(exits) }, 185 { "io_exits", VCPU_STAT(io_exits) }, 186 { "mmio_exits", VCPU_STAT(mmio_exits) }, 187 { "signal_exits", VCPU_STAT(signal_exits) }, 188 { "irq_window", VCPU_STAT(irq_window_exits) }, 189 { "nmi_window", VCPU_STAT(nmi_window_exits) }, 190 { "halt_exits", VCPU_STAT(halt_exits) }, 191 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 192 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 193 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) }, 194 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 195 { "hypercalls", VCPU_STAT(hypercalls) }, 196 { "request_irq", VCPU_STAT(request_irq_exits) }, 197 { "irq_exits", VCPU_STAT(irq_exits) }, 198 { "host_state_reload", VCPU_STAT(host_state_reload) }, 199 { "fpu_reload", VCPU_STAT(fpu_reload) }, 200 { "insn_emulation", VCPU_STAT(insn_emulation) }, 201 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, 202 { "irq_injections", VCPU_STAT(irq_injections) }, 203 { "nmi_injections", VCPU_STAT(nmi_injections) }, 204 { "req_event", VCPU_STAT(req_event) }, 205 { "l1d_flush", VCPU_STAT(l1d_flush) }, 206 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, 207 { "mmu_pte_write", VM_STAT(mmu_pte_write) }, 208 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, 209 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, 210 { "mmu_flooded", VM_STAT(mmu_flooded) }, 211 { "mmu_recycled", VM_STAT(mmu_recycled) }, 212 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, 213 { "mmu_unsync", VM_STAT(mmu_unsync) }, 214 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, 215 { "largepages", VM_STAT(lpages, .mode = 0444) }, 216 { "nx_largepages_splitted", VM_STAT(nx_lpage_splits, .mode = 0444) }, 217 { "max_mmu_page_hash_collisions", 218 VM_STAT(max_mmu_page_hash_collisions) }, 219 { NULL } 220 }; 221 222 u64 __read_mostly host_xcr0; 223 224 struct kmem_cache *x86_fpu_cache; 225 EXPORT_SYMBOL_GPL(x86_fpu_cache); 226 227 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); 228 229 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) 230 { 231 int i; 232 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) 233 vcpu->arch.apf.gfns[i] = ~0; 234 } 235 236 static void kvm_on_user_return(struct user_return_notifier *urn) 237 { 238 unsigned slot; 239 struct kvm_shared_msrs *locals 240 = container_of(urn, struct kvm_shared_msrs, urn); 241 struct kvm_shared_msr_values *values; 242 unsigned long flags; 243 244 /* 245 * Disabling irqs at this point since the following code could be 246 * interrupted and executed through kvm_arch_hardware_disable() 247 */ 248 local_irq_save(flags); 249 if (locals->registered) { 250 locals->registered = false; 251 user_return_notifier_unregister(urn); 252 } 253 local_irq_restore(flags); 254 for (slot = 0; slot < shared_msrs_global.nr; ++slot) { 255 values = &locals->values[slot]; 256 if (values->host != values->curr) { 257 wrmsrl(shared_msrs_global.msrs[slot], values->host); 258 values->curr = values->host; 259 } 260 } 261 } 262 263 static void shared_msr_update(unsigned slot, u32 msr) 264 { 265 u64 value; 266 unsigned int cpu = smp_processor_id(); 267 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 268 269 /* only read, and nobody should modify it at this time, 270 * so don't need lock */ 271 if (slot >= shared_msrs_global.nr) { 272 printk(KERN_ERR "kvm: invalid MSR slot!"); 273 return; 274 } 275 rdmsrl_safe(msr, &value); 276 smsr->values[slot].host = value; 277 smsr->values[slot].curr = value; 278 } 279 280 void kvm_define_shared_msr(unsigned slot, u32 msr) 281 { 282 BUG_ON(slot >= KVM_NR_SHARED_MSRS); 283 shared_msrs_global.msrs[slot] = msr; 284 if (slot >= shared_msrs_global.nr) 285 shared_msrs_global.nr = slot + 1; 286 } 287 EXPORT_SYMBOL_GPL(kvm_define_shared_msr); 288 289 static void kvm_shared_msr_cpu_online(void) 290 { 291 unsigned i; 292 293 for (i = 0; i < shared_msrs_global.nr; ++i) 294 shared_msr_update(i, shared_msrs_global.msrs[i]); 295 } 296 297 int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) 298 { 299 unsigned int cpu = smp_processor_id(); 300 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 301 int err; 302 303 if (((value ^ smsr->values[slot].curr) & mask) == 0) 304 return 0; 305 smsr->values[slot].curr = value; 306 err = wrmsrl_safe(shared_msrs_global.msrs[slot], value); 307 if (err) 308 return 1; 309 310 if (!smsr->registered) { 311 smsr->urn.on_user_return = kvm_on_user_return; 312 user_return_notifier_register(&smsr->urn); 313 smsr->registered = true; 314 } 315 return 0; 316 } 317 EXPORT_SYMBOL_GPL(kvm_set_shared_msr); 318 319 static void drop_user_return_notifiers(void) 320 { 321 unsigned int cpu = smp_processor_id(); 322 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 323 324 if (smsr->registered) 325 kvm_on_user_return(&smsr->urn); 326 } 327 328 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) 329 { 330 return vcpu->arch.apic_base; 331 } 332 EXPORT_SYMBOL_GPL(kvm_get_apic_base); 333 334 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu) 335 { 336 return kvm_apic_mode(kvm_get_apic_base(vcpu)); 337 } 338 EXPORT_SYMBOL_GPL(kvm_get_apic_mode); 339 340 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 341 { 342 enum lapic_mode old_mode = kvm_get_apic_mode(vcpu); 343 enum lapic_mode new_mode = kvm_apic_mode(msr_info->data); 344 u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) | 0x2ff | 345 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE); 346 347 if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID) 348 return 1; 349 if (!msr_info->host_initiated) { 350 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC) 351 return 1; 352 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC) 353 return 1; 354 } 355 356 kvm_lapic_set_base(vcpu, msr_info->data); 357 return 0; 358 } 359 EXPORT_SYMBOL_GPL(kvm_set_apic_base); 360 361 asmlinkage __visible void kvm_spurious_fault(void) 362 { 363 /* Fault while not rebooting. We want the trace. */ 364 BUG_ON(!kvm_rebooting); 365 } 366 EXPORT_SYMBOL_GPL(kvm_spurious_fault); 367 368 #define EXCPT_BENIGN 0 369 #define EXCPT_CONTRIBUTORY 1 370 #define EXCPT_PF 2 371 372 static int exception_class(int vector) 373 { 374 switch (vector) { 375 case PF_VECTOR: 376 return EXCPT_PF; 377 case DE_VECTOR: 378 case TS_VECTOR: 379 case NP_VECTOR: 380 case SS_VECTOR: 381 case GP_VECTOR: 382 return EXCPT_CONTRIBUTORY; 383 default: 384 break; 385 } 386 return EXCPT_BENIGN; 387 } 388 389 #define EXCPT_FAULT 0 390 #define EXCPT_TRAP 1 391 #define EXCPT_ABORT 2 392 #define EXCPT_INTERRUPT 3 393 394 static int exception_type(int vector) 395 { 396 unsigned int mask; 397 398 if (WARN_ON(vector > 31 || vector == NMI_VECTOR)) 399 return EXCPT_INTERRUPT; 400 401 mask = 1 << vector; 402 403 /* #DB is trap, as instruction watchpoints are handled elsewhere */ 404 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR))) 405 return EXCPT_TRAP; 406 407 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR))) 408 return EXCPT_ABORT; 409 410 /* Reserved exceptions will result in fault */ 411 return EXCPT_FAULT; 412 } 413 414 void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu) 415 { 416 unsigned nr = vcpu->arch.exception.nr; 417 bool has_payload = vcpu->arch.exception.has_payload; 418 unsigned long payload = vcpu->arch.exception.payload; 419 420 if (!has_payload) 421 return; 422 423 switch (nr) { 424 case DB_VECTOR: 425 /* 426 * "Certain debug exceptions may clear bit 0-3. The 427 * remaining contents of the DR6 register are never 428 * cleared by the processor". 429 */ 430 vcpu->arch.dr6 &= ~DR_TRAP_BITS; 431 /* 432 * DR6.RTM is set by all #DB exceptions that don't clear it. 433 */ 434 vcpu->arch.dr6 |= DR6_RTM; 435 vcpu->arch.dr6 |= payload; 436 /* 437 * Bit 16 should be set in the payload whenever the #DB 438 * exception should clear DR6.RTM. This makes the payload 439 * compatible with the pending debug exceptions under VMX. 440 * Though not currently documented in the SDM, this also 441 * makes the payload compatible with the exit qualification 442 * for #DB exceptions under VMX. 443 */ 444 vcpu->arch.dr6 ^= payload & DR6_RTM; 445 break; 446 case PF_VECTOR: 447 vcpu->arch.cr2 = payload; 448 break; 449 } 450 451 vcpu->arch.exception.has_payload = false; 452 vcpu->arch.exception.payload = 0; 453 } 454 EXPORT_SYMBOL_GPL(kvm_deliver_exception_payload); 455 456 static void kvm_multiple_exception(struct kvm_vcpu *vcpu, 457 unsigned nr, bool has_error, u32 error_code, 458 bool has_payload, unsigned long payload, bool reinject) 459 { 460 u32 prev_nr; 461 int class1, class2; 462 463 kvm_make_request(KVM_REQ_EVENT, vcpu); 464 465 if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) { 466 queue: 467 if (has_error && !is_protmode(vcpu)) 468 has_error = false; 469 if (reinject) { 470 /* 471 * On vmentry, vcpu->arch.exception.pending is only 472 * true if an event injection was blocked by 473 * nested_run_pending. In that case, however, 474 * vcpu_enter_guest requests an immediate exit, 475 * and the guest shouldn't proceed far enough to 476 * need reinjection. 477 */ 478 WARN_ON_ONCE(vcpu->arch.exception.pending); 479 vcpu->arch.exception.injected = true; 480 if (WARN_ON_ONCE(has_payload)) { 481 /* 482 * A reinjected event has already 483 * delivered its payload. 484 */ 485 has_payload = false; 486 payload = 0; 487 } 488 } else { 489 vcpu->arch.exception.pending = true; 490 vcpu->arch.exception.injected = false; 491 } 492 vcpu->arch.exception.has_error_code = has_error; 493 vcpu->arch.exception.nr = nr; 494 vcpu->arch.exception.error_code = error_code; 495 vcpu->arch.exception.has_payload = has_payload; 496 vcpu->arch.exception.payload = payload; 497 /* 498 * In guest mode, payload delivery should be deferred, 499 * so that the L1 hypervisor can intercept #PF before 500 * CR2 is modified (or intercept #DB before DR6 is 501 * modified under nVMX). However, for ABI 502 * compatibility with KVM_GET_VCPU_EVENTS and 503 * KVM_SET_VCPU_EVENTS, we can't delay payload 504 * delivery unless userspace has enabled this 505 * functionality via the per-VM capability, 506 * KVM_CAP_EXCEPTION_PAYLOAD. 507 */ 508 if (!vcpu->kvm->arch.exception_payload_enabled || 509 !is_guest_mode(vcpu)) 510 kvm_deliver_exception_payload(vcpu); 511 return; 512 } 513 514 /* to check exception */ 515 prev_nr = vcpu->arch.exception.nr; 516 if (prev_nr == DF_VECTOR) { 517 /* triple fault -> shutdown */ 518 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 519 return; 520 } 521 class1 = exception_class(prev_nr); 522 class2 = exception_class(nr); 523 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) 524 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { 525 /* 526 * Generate double fault per SDM Table 5-5. Set 527 * exception.pending = true so that the double fault 528 * can trigger a nested vmexit. 529 */ 530 vcpu->arch.exception.pending = true; 531 vcpu->arch.exception.injected = false; 532 vcpu->arch.exception.has_error_code = true; 533 vcpu->arch.exception.nr = DF_VECTOR; 534 vcpu->arch.exception.error_code = 0; 535 vcpu->arch.exception.has_payload = false; 536 vcpu->arch.exception.payload = 0; 537 } else 538 /* replace previous exception with a new one in a hope 539 that instruction re-execution will regenerate lost 540 exception */ 541 goto queue; 542 } 543 544 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) 545 { 546 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, false); 547 } 548 EXPORT_SYMBOL_GPL(kvm_queue_exception); 549 550 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) 551 { 552 kvm_multiple_exception(vcpu, nr, false, 0, false, 0, true); 553 } 554 EXPORT_SYMBOL_GPL(kvm_requeue_exception); 555 556 static void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr, 557 unsigned long payload) 558 { 559 kvm_multiple_exception(vcpu, nr, false, 0, true, payload, false); 560 } 561 562 static void kvm_queue_exception_e_p(struct kvm_vcpu *vcpu, unsigned nr, 563 u32 error_code, unsigned long payload) 564 { 565 kvm_multiple_exception(vcpu, nr, true, error_code, 566 true, payload, false); 567 } 568 569 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) 570 { 571 if (err) 572 kvm_inject_gp(vcpu, 0); 573 else 574 return kvm_skip_emulated_instruction(vcpu); 575 576 return 1; 577 } 578 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); 579 580 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 581 { 582 ++vcpu->stat.pf_guest; 583 vcpu->arch.exception.nested_apf = 584 is_guest_mode(vcpu) && fault->async_page_fault; 585 if (vcpu->arch.exception.nested_apf) { 586 vcpu->arch.apf.nested_apf_token = fault->address; 587 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); 588 } else { 589 kvm_queue_exception_e_p(vcpu, PF_VECTOR, fault->error_code, 590 fault->address); 591 } 592 } 593 EXPORT_SYMBOL_GPL(kvm_inject_page_fault); 594 595 static bool kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 596 { 597 if (mmu_is_nested(vcpu) && !fault->nested_page_fault) 598 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault); 599 else 600 vcpu->arch.mmu->inject_page_fault(vcpu, fault); 601 602 return fault->nested_page_fault; 603 } 604 605 void kvm_inject_nmi(struct kvm_vcpu *vcpu) 606 { 607 atomic_inc(&vcpu->arch.nmi_queued); 608 kvm_make_request(KVM_REQ_NMI, vcpu); 609 } 610 EXPORT_SYMBOL_GPL(kvm_inject_nmi); 611 612 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 613 { 614 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, false); 615 } 616 EXPORT_SYMBOL_GPL(kvm_queue_exception_e); 617 618 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 619 { 620 kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, true); 621 } 622 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); 623 624 /* 625 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue 626 * a #GP and return false. 627 */ 628 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) 629 { 630 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) 631 return true; 632 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 633 return false; 634 } 635 EXPORT_SYMBOL_GPL(kvm_require_cpl); 636 637 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr) 638 { 639 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE)) 640 return true; 641 642 kvm_queue_exception(vcpu, UD_VECTOR); 643 return false; 644 } 645 EXPORT_SYMBOL_GPL(kvm_require_dr); 646 647 /* 648 * This function will be used to read from the physical memory of the currently 649 * running guest. The difference to kvm_vcpu_read_guest_page is that this function 650 * can read from guest physical or from the guest's guest physical memory. 651 */ 652 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, 653 gfn_t ngfn, void *data, int offset, int len, 654 u32 access) 655 { 656 struct x86_exception exception; 657 gfn_t real_gfn; 658 gpa_t ngpa; 659 660 ngpa = gfn_to_gpa(ngfn); 661 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception); 662 if (real_gfn == UNMAPPED_GVA) 663 return -EFAULT; 664 665 real_gfn = gpa_to_gfn(real_gfn); 666 667 return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len); 668 } 669 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); 670 671 static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, 672 void *data, int offset, int len, u32 access) 673 { 674 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, 675 data, offset, len, access); 676 } 677 678 static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu) 679 { 680 return rsvd_bits(cpuid_maxphyaddr(vcpu), 63) | rsvd_bits(5, 8) | 681 rsvd_bits(1, 2); 682 } 683 684 /* 685 * Load the pae pdptrs. Return 1 if they are all valid, 0 otherwise. 686 */ 687 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) 688 { 689 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; 690 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; 691 int i; 692 int ret; 693 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; 694 695 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, 696 offset * sizeof(u64), sizeof(pdpte), 697 PFERR_USER_MASK|PFERR_WRITE_MASK); 698 if (ret < 0) { 699 ret = 0; 700 goto out; 701 } 702 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { 703 if ((pdpte[i] & PT_PRESENT_MASK) && 704 (pdpte[i] & pdptr_rsvd_bits(vcpu))) { 705 ret = 0; 706 goto out; 707 } 708 } 709 ret = 1; 710 711 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); 712 __set_bit(VCPU_EXREG_PDPTR, 713 (unsigned long *)&vcpu->arch.regs_avail); 714 __set_bit(VCPU_EXREG_PDPTR, 715 (unsigned long *)&vcpu->arch.regs_dirty); 716 out: 717 718 return ret; 719 } 720 EXPORT_SYMBOL_GPL(load_pdptrs); 721 722 bool pdptrs_changed(struct kvm_vcpu *vcpu) 723 { 724 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; 725 bool changed = true; 726 int offset; 727 gfn_t gfn; 728 int r; 729 730 if (!is_pae_paging(vcpu)) 731 return false; 732 733 if (!test_bit(VCPU_EXREG_PDPTR, 734 (unsigned long *)&vcpu->arch.regs_avail)) 735 return true; 736 737 gfn = (kvm_read_cr3(vcpu) & 0xffffffe0ul) >> PAGE_SHIFT; 738 offset = (kvm_read_cr3(vcpu) & 0xffffffe0ul) & (PAGE_SIZE - 1); 739 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), 740 PFERR_USER_MASK | PFERR_WRITE_MASK); 741 if (r < 0) 742 goto out; 743 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; 744 out: 745 746 return changed; 747 } 748 EXPORT_SYMBOL_GPL(pdptrs_changed); 749 750 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) 751 { 752 unsigned long old_cr0 = kvm_read_cr0(vcpu); 753 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP; 754 755 cr0 |= X86_CR0_ET; 756 757 #ifdef CONFIG_X86_64 758 if (cr0 & 0xffffffff00000000UL) 759 return 1; 760 #endif 761 762 cr0 &= ~CR0_RESERVED_BITS; 763 764 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) 765 return 1; 766 767 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) 768 return 1; 769 770 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { 771 #ifdef CONFIG_X86_64 772 if ((vcpu->arch.efer & EFER_LME)) { 773 int cs_db, cs_l; 774 775 if (!is_pae(vcpu)) 776 return 1; 777 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 778 if (cs_l) 779 return 1; 780 } else 781 #endif 782 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 783 kvm_read_cr3(vcpu))) 784 return 1; 785 } 786 787 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) 788 return 1; 789 790 kvm_x86_ops->set_cr0(vcpu, cr0); 791 792 if ((cr0 ^ old_cr0) & X86_CR0_PG) { 793 kvm_clear_async_pf_completion_queue(vcpu); 794 kvm_async_pf_hash_reset(vcpu); 795 } 796 797 if ((cr0 ^ old_cr0) & update_bits) 798 kvm_mmu_reset_context(vcpu); 799 800 if (((cr0 ^ old_cr0) & X86_CR0_CD) && 801 kvm_arch_has_noncoherent_dma(vcpu->kvm) && 802 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) 803 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL); 804 805 return 0; 806 } 807 EXPORT_SYMBOL_GPL(kvm_set_cr0); 808 809 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) 810 { 811 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); 812 } 813 EXPORT_SYMBOL_GPL(kvm_lmsw); 814 815 void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu) 816 { 817 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) && 818 !vcpu->guest_xcr0_loaded) { 819 /* kvm_set_xcr() also depends on this */ 820 if (vcpu->arch.xcr0 != host_xcr0) 821 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0); 822 vcpu->guest_xcr0_loaded = 1; 823 } 824 } 825 EXPORT_SYMBOL_GPL(kvm_load_guest_xcr0); 826 827 void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu) 828 { 829 if (vcpu->guest_xcr0_loaded) { 830 if (vcpu->arch.xcr0 != host_xcr0) 831 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0); 832 vcpu->guest_xcr0_loaded = 0; 833 } 834 } 835 EXPORT_SYMBOL_GPL(kvm_put_guest_xcr0); 836 837 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 838 { 839 u64 xcr0 = xcr; 840 u64 old_xcr0 = vcpu->arch.xcr0; 841 u64 valid_bits; 842 843 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ 844 if (index != XCR_XFEATURE_ENABLED_MASK) 845 return 1; 846 if (!(xcr0 & XFEATURE_MASK_FP)) 847 return 1; 848 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE)) 849 return 1; 850 851 /* 852 * Do not allow the guest to set bits that we do not support 853 * saving. However, xcr0 bit 0 is always set, even if the 854 * emulated CPU does not support XSAVE (see fx_init). 855 */ 856 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP; 857 if (xcr0 & ~valid_bits) 858 return 1; 859 860 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) != 861 (!(xcr0 & XFEATURE_MASK_BNDCSR))) 862 return 1; 863 864 if (xcr0 & XFEATURE_MASK_AVX512) { 865 if (!(xcr0 & XFEATURE_MASK_YMM)) 866 return 1; 867 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512) 868 return 1; 869 } 870 vcpu->arch.xcr0 = xcr0; 871 872 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND) 873 kvm_update_cpuid(vcpu); 874 return 0; 875 } 876 877 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 878 { 879 if (kvm_x86_ops->get_cpl(vcpu) != 0 || 880 __kvm_set_xcr(vcpu, index, xcr)) { 881 kvm_inject_gp(vcpu, 0); 882 return 1; 883 } 884 return 0; 885 } 886 EXPORT_SYMBOL_GPL(kvm_set_xcr); 887 888 static int kvm_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 889 { 890 if (cr4 & CR4_RESERVED_BITS) 891 return -EINVAL; 892 893 if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && (cr4 & X86_CR4_OSXSAVE)) 894 return -EINVAL; 895 896 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMEP) && (cr4 & X86_CR4_SMEP)) 897 return -EINVAL; 898 899 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMAP) && (cr4 & X86_CR4_SMAP)) 900 return -EINVAL; 901 902 if (!guest_cpuid_has(vcpu, X86_FEATURE_FSGSBASE) && (cr4 & X86_CR4_FSGSBASE)) 903 return -EINVAL; 904 905 if (!guest_cpuid_has(vcpu, X86_FEATURE_PKU) && (cr4 & X86_CR4_PKE)) 906 return -EINVAL; 907 908 if (!guest_cpuid_has(vcpu, X86_FEATURE_LA57) && (cr4 & X86_CR4_LA57)) 909 return -EINVAL; 910 911 if (!guest_cpuid_has(vcpu, X86_FEATURE_UMIP) && (cr4 & X86_CR4_UMIP)) 912 return -EINVAL; 913 914 return 0; 915 } 916 917 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 918 { 919 unsigned long old_cr4 = kvm_read_cr4(vcpu); 920 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | 921 X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE; 922 923 if (kvm_valid_cr4(vcpu, cr4)) 924 return 1; 925 926 if (is_long_mode(vcpu)) { 927 if (!(cr4 & X86_CR4_PAE)) 928 return 1; 929 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) 930 && ((cr4 ^ old_cr4) & pdptr_bits) 931 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 932 kvm_read_cr3(vcpu))) 933 return 1; 934 935 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) { 936 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID)) 937 return 1; 938 939 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */ 940 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu)) 941 return 1; 942 } 943 944 if (kvm_x86_ops->set_cr4(vcpu, cr4)) 945 return 1; 946 947 if (((cr4 ^ old_cr4) & pdptr_bits) || 948 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))) 949 kvm_mmu_reset_context(vcpu); 950 951 if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE)) 952 kvm_update_cpuid(vcpu); 953 954 return 0; 955 } 956 EXPORT_SYMBOL_GPL(kvm_set_cr4); 957 958 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 959 { 960 bool skip_tlb_flush = false; 961 #ifdef CONFIG_X86_64 962 bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); 963 964 if (pcid_enabled) { 965 skip_tlb_flush = cr3 & X86_CR3_PCID_NOFLUSH; 966 cr3 &= ~X86_CR3_PCID_NOFLUSH; 967 } 968 #endif 969 970 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { 971 if (!skip_tlb_flush) { 972 kvm_mmu_sync_roots(vcpu); 973 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 974 } 975 return 0; 976 } 977 978 if (is_long_mode(vcpu) && 979 (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63))) 980 return 1; 981 else if (is_pae_paging(vcpu) && 982 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 983 return 1; 984 985 kvm_mmu_new_cr3(vcpu, cr3, skip_tlb_flush); 986 vcpu->arch.cr3 = cr3; 987 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 988 989 return 0; 990 } 991 EXPORT_SYMBOL_GPL(kvm_set_cr3); 992 993 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) 994 { 995 if (cr8 & CR8_RESERVED_BITS) 996 return 1; 997 if (lapic_in_kernel(vcpu)) 998 kvm_lapic_set_tpr(vcpu, cr8); 999 else 1000 vcpu->arch.cr8 = cr8; 1001 return 0; 1002 } 1003 EXPORT_SYMBOL_GPL(kvm_set_cr8); 1004 1005 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) 1006 { 1007 if (lapic_in_kernel(vcpu)) 1008 return kvm_lapic_get_cr8(vcpu); 1009 else 1010 return vcpu->arch.cr8; 1011 } 1012 EXPORT_SYMBOL_GPL(kvm_get_cr8); 1013 1014 static void kvm_update_dr0123(struct kvm_vcpu *vcpu) 1015 { 1016 int i; 1017 1018 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { 1019 for (i = 0; i < KVM_NR_DB_REGS; i++) 1020 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 1021 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD; 1022 } 1023 } 1024 1025 static void kvm_update_dr6(struct kvm_vcpu *vcpu) 1026 { 1027 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 1028 kvm_x86_ops->set_dr6(vcpu, vcpu->arch.dr6); 1029 } 1030 1031 static void kvm_update_dr7(struct kvm_vcpu *vcpu) 1032 { 1033 unsigned long dr7; 1034 1035 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 1036 dr7 = vcpu->arch.guest_debug_dr7; 1037 else 1038 dr7 = vcpu->arch.dr7; 1039 kvm_x86_ops->set_dr7(vcpu, dr7); 1040 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED; 1041 if (dr7 & DR7_BP_EN_MASK) 1042 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED; 1043 } 1044 1045 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu) 1046 { 1047 u64 fixed = DR6_FIXED_1; 1048 1049 if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM)) 1050 fixed |= DR6_RTM; 1051 return fixed; 1052 } 1053 1054 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 1055 { 1056 switch (dr) { 1057 case 0 ... 3: 1058 vcpu->arch.db[dr] = val; 1059 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 1060 vcpu->arch.eff_db[dr] = val; 1061 break; 1062 case 4: 1063 /* fall through */ 1064 case 6: 1065 if (val & 0xffffffff00000000ULL) 1066 return -1; /* #GP */ 1067 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu); 1068 kvm_update_dr6(vcpu); 1069 break; 1070 case 5: 1071 /* fall through */ 1072 default: /* 7 */ 1073 if (val & 0xffffffff00000000ULL) 1074 return -1; /* #GP */ 1075 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; 1076 kvm_update_dr7(vcpu); 1077 break; 1078 } 1079 1080 return 0; 1081 } 1082 1083 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 1084 { 1085 if (__kvm_set_dr(vcpu, dr, val)) { 1086 kvm_inject_gp(vcpu, 0); 1087 return 1; 1088 } 1089 return 0; 1090 } 1091 EXPORT_SYMBOL_GPL(kvm_set_dr); 1092 1093 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) 1094 { 1095 switch (dr) { 1096 case 0 ... 3: 1097 *val = vcpu->arch.db[dr]; 1098 break; 1099 case 4: 1100 /* fall through */ 1101 case 6: 1102 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 1103 *val = vcpu->arch.dr6; 1104 else 1105 *val = kvm_x86_ops->get_dr6(vcpu); 1106 break; 1107 case 5: 1108 /* fall through */ 1109 default: /* 7 */ 1110 *val = vcpu->arch.dr7; 1111 break; 1112 } 1113 return 0; 1114 } 1115 EXPORT_SYMBOL_GPL(kvm_get_dr); 1116 1117 bool kvm_rdpmc(struct kvm_vcpu *vcpu) 1118 { 1119 u32 ecx = kvm_rcx_read(vcpu); 1120 u64 data; 1121 int err; 1122 1123 err = kvm_pmu_rdpmc(vcpu, ecx, &data); 1124 if (err) 1125 return err; 1126 kvm_rax_write(vcpu, (u32)data); 1127 kvm_rdx_write(vcpu, data >> 32); 1128 return err; 1129 } 1130 EXPORT_SYMBOL_GPL(kvm_rdpmc); 1131 1132 /* 1133 * List of msr numbers which we expose to userspace through KVM_GET_MSRS 1134 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. 1135 * 1136 * This list is modified at module load time to reflect the 1137 * capabilities of the host cpu. This capabilities test skips MSRs that are 1138 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs 1139 * may depend on host virtualization features rather than host cpu features. 1140 */ 1141 1142 static u32 msrs_to_save[] = { 1143 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, 1144 MSR_STAR, 1145 #ifdef CONFIG_X86_64 1146 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, 1147 #endif 1148 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA, 1149 MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS, MSR_TSC_AUX, 1150 MSR_IA32_SPEC_CTRL, 1151 MSR_IA32_RTIT_CTL, MSR_IA32_RTIT_STATUS, MSR_IA32_RTIT_CR3_MATCH, 1152 MSR_IA32_RTIT_OUTPUT_BASE, MSR_IA32_RTIT_OUTPUT_MASK, 1153 MSR_IA32_RTIT_ADDR0_A, MSR_IA32_RTIT_ADDR0_B, 1154 MSR_IA32_RTIT_ADDR1_A, MSR_IA32_RTIT_ADDR1_B, 1155 MSR_IA32_RTIT_ADDR2_A, MSR_IA32_RTIT_ADDR2_B, 1156 MSR_IA32_RTIT_ADDR3_A, MSR_IA32_RTIT_ADDR3_B, 1157 MSR_IA32_UMWAIT_CONTROL, 1158 1159 MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1, 1160 MSR_ARCH_PERFMON_FIXED_CTR0 + 2, MSR_ARCH_PERFMON_FIXED_CTR0 + 3, 1161 MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS, 1162 MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL, 1163 MSR_ARCH_PERFMON_PERFCTR0, MSR_ARCH_PERFMON_PERFCTR1, 1164 MSR_ARCH_PERFMON_PERFCTR0 + 2, MSR_ARCH_PERFMON_PERFCTR0 + 3, 1165 MSR_ARCH_PERFMON_PERFCTR0 + 4, MSR_ARCH_PERFMON_PERFCTR0 + 5, 1166 MSR_ARCH_PERFMON_PERFCTR0 + 6, MSR_ARCH_PERFMON_PERFCTR0 + 7, 1167 MSR_ARCH_PERFMON_PERFCTR0 + 8, MSR_ARCH_PERFMON_PERFCTR0 + 9, 1168 MSR_ARCH_PERFMON_PERFCTR0 + 10, MSR_ARCH_PERFMON_PERFCTR0 + 11, 1169 MSR_ARCH_PERFMON_PERFCTR0 + 12, MSR_ARCH_PERFMON_PERFCTR0 + 13, 1170 MSR_ARCH_PERFMON_PERFCTR0 + 14, MSR_ARCH_PERFMON_PERFCTR0 + 15, 1171 MSR_ARCH_PERFMON_PERFCTR0 + 16, MSR_ARCH_PERFMON_PERFCTR0 + 17, 1172 MSR_ARCH_PERFMON_EVENTSEL0, MSR_ARCH_PERFMON_EVENTSEL1, 1173 MSR_ARCH_PERFMON_EVENTSEL0 + 2, MSR_ARCH_PERFMON_EVENTSEL0 + 3, 1174 MSR_ARCH_PERFMON_EVENTSEL0 + 4, MSR_ARCH_PERFMON_EVENTSEL0 + 5, 1175 MSR_ARCH_PERFMON_EVENTSEL0 + 6, MSR_ARCH_PERFMON_EVENTSEL0 + 7, 1176 MSR_ARCH_PERFMON_EVENTSEL0 + 8, MSR_ARCH_PERFMON_EVENTSEL0 + 9, 1177 MSR_ARCH_PERFMON_EVENTSEL0 + 10, MSR_ARCH_PERFMON_EVENTSEL0 + 11, 1178 MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13, 1179 MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15, 1180 MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17, 1181 }; 1182 1183 static unsigned num_msrs_to_save; 1184 1185 static u32 emulated_msrs[] = { 1186 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, 1187 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, 1188 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, 1189 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC, 1190 HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY, 1191 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2, 1192 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL, 1193 HV_X64_MSR_RESET, 1194 HV_X64_MSR_VP_INDEX, 1195 HV_X64_MSR_VP_RUNTIME, 1196 HV_X64_MSR_SCONTROL, 1197 HV_X64_MSR_STIMER0_CONFIG, 1198 HV_X64_MSR_VP_ASSIST_PAGE, 1199 HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL, 1200 HV_X64_MSR_TSC_EMULATION_STATUS, 1201 1202 MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, 1203 MSR_KVM_PV_EOI_EN, 1204 1205 MSR_IA32_TSC_ADJUST, 1206 MSR_IA32_TSCDEADLINE, 1207 MSR_IA32_ARCH_CAPABILITIES, 1208 MSR_IA32_MISC_ENABLE, 1209 MSR_IA32_MCG_STATUS, 1210 MSR_IA32_MCG_CTL, 1211 MSR_IA32_MCG_EXT_CTL, 1212 MSR_IA32_SMBASE, 1213 MSR_SMI_COUNT, 1214 MSR_PLATFORM_INFO, 1215 MSR_MISC_FEATURES_ENABLES, 1216 MSR_AMD64_VIRT_SPEC_CTRL, 1217 MSR_IA32_POWER_CTL, 1218 1219 /* 1220 * The following list leaves out MSRs whose values are determined 1221 * by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs. 1222 * We always support the "true" VMX control MSRs, even if the host 1223 * processor does not, so I am putting these registers here rather 1224 * than in msrs_to_save. 1225 */ 1226 MSR_IA32_VMX_BASIC, 1227 MSR_IA32_VMX_TRUE_PINBASED_CTLS, 1228 MSR_IA32_VMX_TRUE_PROCBASED_CTLS, 1229 MSR_IA32_VMX_TRUE_EXIT_CTLS, 1230 MSR_IA32_VMX_TRUE_ENTRY_CTLS, 1231 MSR_IA32_VMX_MISC, 1232 MSR_IA32_VMX_CR0_FIXED0, 1233 MSR_IA32_VMX_CR4_FIXED0, 1234 MSR_IA32_VMX_VMCS_ENUM, 1235 MSR_IA32_VMX_PROCBASED_CTLS2, 1236 MSR_IA32_VMX_EPT_VPID_CAP, 1237 MSR_IA32_VMX_VMFUNC, 1238 1239 MSR_K7_HWCR, 1240 MSR_KVM_POLL_CONTROL, 1241 }; 1242 1243 static unsigned num_emulated_msrs; 1244 1245 /* 1246 * List of msr numbers which are used to expose MSR-based features that 1247 * can be used by a hypervisor to validate requested CPU features. 1248 */ 1249 static u32 msr_based_features[] = { 1250 MSR_IA32_VMX_BASIC, 1251 MSR_IA32_VMX_TRUE_PINBASED_CTLS, 1252 MSR_IA32_VMX_PINBASED_CTLS, 1253 MSR_IA32_VMX_TRUE_PROCBASED_CTLS, 1254 MSR_IA32_VMX_PROCBASED_CTLS, 1255 MSR_IA32_VMX_TRUE_EXIT_CTLS, 1256 MSR_IA32_VMX_EXIT_CTLS, 1257 MSR_IA32_VMX_TRUE_ENTRY_CTLS, 1258 MSR_IA32_VMX_ENTRY_CTLS, 1259 MSR_IA32_VMX_MISC, 1260 MSR_IA32_VMX_CR0_FIXED0, 1261 MSR_IA32_VMX_CR0_FIXED1, 1262 MSR_IA32_VMX_CR4_FIXED0, 1263 MSR_IA32_VMX_CR4_FIXED1, 1264 MSR_IA32_VMX_VMCS_ENUM, 1265 MSR_IA32_VMX_PROCBASED_CTLS2, 1266 MSR_IA32_VMX_EPT_VPID_CAP, 1267 MSR_IA32_VMX_VMFUNC, 1268 1269 MSR_F10H_DECFG, 1270 MSR_IA32_UCODE_REV, 1271 MSR_IA32_ARCH_CAPABILITIES, 1272 }; 1273 1274 static unsigned int num_msr_based_features; 1275 1276 static u64 kvm_get_arch_capabilities(void) 1277 { 1278 u64 data = 0; 1279 1280 if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) 1281 rdmsrl(MSR_IA32_ARCH_CAPABILITIES, data); 1282 1283 /* 1284 * If nx_huge_pages is enabled, KVM's shadow paging will ensure that 1285 * the nested hypervisor runs with NX huge pages. If it is not, 1286 * L1 is anyway vulnerable to ITLB_MULTIHIT explots from other 1287 * L1 guests, so it need not worry about its own (L2) guests. 1288 */ 1289 data |= ARCH_CAP_PSCHANGE_MC_NO; 1290 1291 /* 1292 * If we're doing cache flushes (either "always" or "cond") 1293 * we will do one whenever the guest does a vmlaunch/vmresume. 1294 * If an outer hypervisor is doing the cache flush for us 1295 * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that 1296 * capability to the guest too, and if EPT is disabled we're not 1297 * vulnerable. Overall, only VMENTER_L1D_FLUSH_NEVER will 1298 * require a nested hypervisor to do a flush of its own. 1299 */ 1300 if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER) 1301 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH; 1302 1303 if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) 1304 data |= ARCH_CAP_RDCL_NO; 1305 if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) 1306 data |= ARCH_CAP_SSB_NO; 1307 if (!boot_cpu_has_bug(X86_BUG_MDS)) 1308 data |= ARCH_CAP_MDS_NO; 1309 1310 /* 1311 * On TAA affected systems, export MDS_NO=0 when: 1312 * - TSX is enabled on the host, i.e. X86_FEATURE_RTM=1. 1313 * - Updated microcode is present. This is detected by 1314 * the presence of ARCH_CAP_TSX_CTRL_MSR and ensures 1315 * that VERW clears CPU buffers. 1316 * 1317 * When MDS_NO=0 is exported, guests deploy clear CPU buffer 1318 * mitigation and don't complain: 1319 * 1320 * "Vulnerable: Clear CPU buffers attempted, no microcode" 1321 * 1322 * If TSX is disabled on the system, guests are also mitigated against 1323 * TAA and clear CPU buffer mitigation is not required for guests. 1324 */ 1325 if (boot_cpu_has_bug(X86_BUG_TAA) && boot_cpu_has(X86_FEATURE_RTM) && 1326 (data & ARCH_CAP_TSX_CTRL_MSR)) 1327 data &= ~ARCH_CAP_MDS_NO; 1328 1329 return data; 1330 } 1331 1332 static int kvm_get_msr_feature(struct kvm_msr_entry *msr) 1333 { 1334 switch (msr->index) { 1335 case MSR_IA32_ARCH_CAPABILITIES: 1336 msr->data = kvm_get_arch_capabilities(); 1337 break; 1338 case MSR_IA32_UCODE_REV: 1339 rdmsrl_safe(msr->index, &msr->data); 1340 break; 1341 default: 1342 if (kvm_x86_ops->get_msr_feature(msr)) 1343 return 1; 1344 } 1345 return 0; 1346 } 1347 1348 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1349 { 1350 struct kvm_msr_entry msr; 1351 int r; 1352 1353 msr.index = index; 1354 r = kvm_get_msr_feature(&msr); 1355 if (r) 1356 return r; 1357 1358 *data = msr.data; 1359 1360 return 0; 1361 } 1362 1363 static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1364 { 1365 if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT)) 1366 return false; 1367 1368 if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM)) 1369 return false; 1370 1371 if (efer & (EFER_LME | EFER_LMA) && 1372 !guest_cpuid_has(vcpu, X86_FEATURE_LM)) 1373 return false; 1374 1375 if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX)) 1376 return false; 1377 1378 return true; 1379 1380 } 1381 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1382 { 1383 if (efer & efer_reserved_bits) 1384 return false; 1385 1386 return __kvm_valid_efer(vcpu, efer); 1387 } 1388 EXPORT_SYMBOL_GPL(kvm_valid_efer); 1389 1390 static int set_efer(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 1391 { 1392 u64 old_efer = vcpu->arch.efer; 1393 u64 efer = msr_info->data; 1394 1395 if (efer & efer_reserved_bits) 1396 return 1; 1397 1398 if (!msr_info->host_initiated) { 1399 if (!__kvm_valid_efer(vcpu, efer)) 1400 return 1; 1401 1402 if (is_paging(vcpu) && 1403 (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) 1404 return 1; 1405 } 1406 1407 efer &= ~EFER_LMA; 1408 efer |= vcpu->arch.efer & EFER_LMA; 1409 1410 kvm_x86_ops->set_efer(vcpu, efer); 1411 1412 /* Update reserved bits */ 1413 if ((efer ^ old_efer) & EFER_NX) 1414 kvm_mmu_reset_context(vcpu); 1415 1416 return 0; 1417 } 1418 1419 void kvm_enable_efer_bits(u64 mask) 1420 { 1421 efer_reserved_bits &= ~mask; 1422 } 1423 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); 1424 1425 /* 1426 * Write @data into the MSR specified by @index. Select MSR specific fault 1427 * checks are bypassed if @host_initiated is %true. 1428 * Returns 0 on success, non-0 otherwise. 1429 * Assumes vcpu_load() was already called. 1430 */ 1431 static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data, 1432 bool host_initiated) 1433 { 1434 struct msr_data msr; 1435 1436 switch (index) { 1437 case MSR_FS_BASE: 1438 case MSR_GS_BASE: 1439 case MSR_KERNEL_GS_BASE: 1440 case MSR_CSTAR: 1441 case MSR_LSTAR: 1442 if (is_noncanonical_address(data, vcpu)) 1443 return 1; 1444 break; 1445 case MSR_IA32_SYSENTER_EIP: 1446 case MSR_IA32_SYSENTER_ESP: 1447 /* 1448 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if 1449 * non-canonical address is written on Intel but not on 1450 * AMD (which ignores the top 32-bits, because it does 1451 * not implement 64-bit SYSENTER). 1452 * 1453 * 64-bit code should hence be able to write a non-canonical 1454 * value on AMD. Making the address canonical ensures that 1455 * vmentry does not fail on Intel after writing a non-canonical 1456 * value, and that something deterministic happens if the guest 1457 * invokes 64-bit SYSENTER. 1458 */ 1459 data = get_canonical(data, vcpu_virt_addr_bits(vcpu)); 1460 } 1461 1462 msr.data = data; 1463 msr.index = index; 1464 msr.host_initiated = host_initiated; 1465 1466 return kvm_x86_ops->set_msr(vcpu, &msr); 1467 } 1468 1469 /* 1470 * Read the MSR specified by @index into @data. Select MSR specific fault 1471 * checks are bypassed if @host_initiated is %true. 1472 * Returns 0 on success, non-0 otherwise. 1473 * Assumes vcpu_load() was already called. 1474 */ 1475 static int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data, 1476 bool host_initiated) 1477 { 1478 struct msr_data msr; 1479 int ret; 1480 1481 msr.index = index; 1482 msr.host_initiated = host_initiated; 1483 1484 ret = kvm_x86_ops->get_msr(vcpu, &msr); 1485 if (!ret) 1486 *data = msr.data; 1487 return ret; 1488 } 1489 1490 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data) 1491 { 1492 return __kvm_get_msr(vcpu, index, data, false); 1493 } 1494 EXPORT_SYMBOL_GPL(kvm_get_msr); 1495 1496 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data) 1497 { 1498 return __kvm_set_msr(vcpu, index, data, false); 1499 } 1500 EXPORT_SYMBOL_GPL(kvm_set_msr); 1501 1502 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu) 1503 { 1504 u32 ecx = kvm_rcx_read(vcpu); 1505 u64 data; 1506 1507 if (kvm_get_msr(vcpu, ecx, &data)) { 1508 trace_kvm_msr_read_ex(ecx); 1509 kvm_inject_gp(vcpu, 0); 1510 return 1; 1511 } 1512 1513 trace_kvm_msr_read(ecx, data); 1514 1515 kvm_rax_write(vcpu, data & -1u); 1516 kvm_rdx_write(vcpu, (data >> 32) & -1u); 1517 return kvm_skip_emulated_instruction(vcpu); 1518 } 1519 EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr); 1520 1521 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu) 1522 { 1523 u32 ecx = kvm_rcx_read(vcpu); 1524 u64 data = kvm_read_edx_eax(vcpu); 1525 1526 if (kvm_set_msr(vcpu, ecx, data)) { 1527 trace_kvm_msr_write_ex(ecx, data); 1528 kvm_inject_gp(vcpu, 0); 1529 return 1; 1530 } 1531 1532 trace_kvm_msr_write(ecx, data); 1533 return kvm_skip_emulated_instruction(vcpu); 1534 } 1535 EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr); 1536 1537 /* 1538 * Adapt set_msr() to msr_io()'s calling convention 1539 */ 1540 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1541 { 1542 return __kvm_get_msr(vcpu, index, data, true); 1543 } 1544 1545 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1546 { 1547 return __kvm_set_msr(vcpu, index, *data, true); 1548 } 1549 1550 #ifdef CONFIG_X86_64 1551 struct pvclock_gtod_data { 1552 seqcount_t seq; 1553 1554 struct { /* extract of a clocksource struct */ 1555 int vclock_mode; 1556 u64 cycle_last; 1557 u64 mask; 1558 u32 mult; 1559 u32 shift; 1560 } clock; 1561 1562 u64 boot_ns; 1563 u64 nsec_base; 1564 u64 wall_time_sec; 1565 }; 1566 1567 static struct pvclock_gtod_data pvclock_gtod_data; 1568 1569 static void update_pvclock_gtod(struct timekeeper *tk) 1570 { 1571 struct pvclock_gtod_data *vdata = &pvclock_gtod_data; 1572 u64 boot_ns; 1573 1574 boot_ns = ktime_to_ns(ktime_add(tk->tkr_mono.base, tk->offs_boot)); 1575 1576 write_seqcount_begin(&vdata->seq); 1577 1578 /* copy pvclock gtod data */ 1579 vdata->clock.vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode; 1580 vdata->clock.cycle_last = tk->tkr_mono.cycle_last; 1581 vdata->clock.mask = tk->tkr_mono.mask; 1582 vdata->clock.mult = tk->tkr_mono.mult; 1583 vdata->clock.shift = tk->tkr_mono.shift; 1584 1585 vdata->boot_ns = boot_ns; 1586 vdata->nsec_base = tk->tkr_mono.xtime_nsec; 1587 1588 vdata->wall_time_sec = tk->xtime_sec; 1589 1590 write_seqcount_end(&vdata->seq); 1591 } 1592 #endif 1593 1594 void kvm_set_pending_timer(struct kvm_vcpu *vcpu) 1595 { 1596 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); 1597 kvm_vcpu_kick(vcpu); 1598 } 1599 1600 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) 1601 { 1602 int version; 1603 int r; 1604 struct pvclock_wall_clock wc; 1605 struct timespec64 boot; 1606 1607 if (!wall_clock) 1608 return; 1609 1610 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); 1611 if (r) 1612 return; 1613 1614 if (version & 1) 1615 ++version; /* first time write, random junk */ 1616 1617 ++version; 1618 1619 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version))) 1620 return; 1621 1622 /* 1623 * The guest calculates current wall clock time by adding 1624 * system time (updated by kvm_guest_time_update below) to the 1625 * wall clock specified here. guest system time equals host 1626 * system time for us, thus we must fill in host boot time here. 1627 */ 1628 getboottime64(&boot); 1629 1630 if (kvm->arch.kvmclock_offset) { 1631 struct timespec64 ts = ns_to_timespec64(kvm->arch.kvmclock_offset); 1632 boot = timespec64_sub(boot, ts); 1633 } 1634 wc.sec = (u32)boot.tv_sec; /* overflow in 2106 guest time */ 1635 wc.nsec = boot.tv_nsec; 1636 wc.version = version; 1637 1638 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); 1639 1640 version++; 1641 kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); 1642 } 1643 1644 static uint32_t div_frac(uint32_t dividend, uint32_t divisor) 1645 { 1646 do_shl32_div32(dividend, divisor); 1647 return dividend; 1648 } 1649 1650 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz, 1651 s8 *pshift, u32 *pmultiplier) 1652 { 1653 uint64_t scaled64; 1654 int32_t shift = 0; 1655 uint64_t tps64; 1656 uint32_t tps32; 1657 1658 tps64 = base_hz; 1659 scaled64 = scaled_hz; 1660 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { 1661 tps64 >>= 1; 1662 shift--; 1663 } 1664 1665 tps32 = (uint32_t)tps64; 1666 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { 1667 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) 1668 scaled64 >>= 1; 1669 else 1670 tps32 <<= 1; 1671 shift++; 1672 } 1673 1674 *pshift = shift; 1675 *pmultiplier = div_frac(scaled64, tps32); 1676 } 1677 1678 #ifdef CONFIG_X86_64 1679 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0); 1680 #endif 1681 1682 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); 1683 static unsigned long max_tsc_khz; 1684 1685 static u32 adjust_tsc_khz(u32 khz, s32 ppm) 1686 { 1687 u64 v = (u64)khz * (1000000 + ppm); 1688 do_div(v, 1000000); 1689 return v; 1690 } 1691 1692 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) 1693 { 1694 u64 ratio; 1695 1696 /* Guest TSC same frequency as host TSC? */ 1697 if (!scale) { 1698 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1699 return 0; 1700 } 1701 1702 /* TSC scaling supported? */ 1703 if (!kvm_has_tsc_control) { 1704 if (user_tsc_khz > tsc_khz) { 1705 vcpu->arch.tsc_catchup = 1; 1706 vcpu->arch.tsc_always_catchup = 1; 1707 return 0; 1708 } else { 1709 pr_warn_ratelimited("user requested TSC rate below hardware speed\n"); 1710 return -1; 1711 } 1712 } 1713 1714 /* TSC scaling required - calculate ratio */ 1715 ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits, 1716 user_tsc_khz, tsc_khz); 1717 1718 if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) { 1719 pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n", 1720 user_tsc_khz); 1721 return -1; 1722 } 1723 1724 vcpu->arch.tsc_scaling_ratio = ratio; 1725 return 0; 1726 } 1727 1728 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) 1729 { 1730 u32 thresh_lo, thresh_hi; 1731 int use_scaling = 0; 1732 1733 /* tsc_khz can be zero if TSC calibration fails */ 1734 if (user_tsc_khz == 0) { 1735 /* set tsc_scaling_ratio to a safe value */ 1736 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1737 return -1; 1738 } 1739 1740 /* Compute a scale to convert nanoseconds in TSC cycles */ 1741 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC, 1742 &vcpu->arch.virtual_tsc_shift, 1743 &vcpu->arch.virtual_tsc_mult); 1744 vcpu->arch.virtual_tsc_khz = user_tsc_khz; 1745 1746 /* 1747 * Compute the variation in TSC rate which is acceptable 1748 * within the range of tolerance and decide if the 1749 * rate being applied is within that bounds of the hardware 1750 * rate. If so, no scaling or compensation need be done. 1751 */ 1752 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm); 1753 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm); 1754 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) { 1755 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi); 1756 use_scaling = 1; 1757 } 1758 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling); 1759 } 1760 1761 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) 1762 { 1763 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec, 1764 vcpu->arch.virtual_tsc_mult, 1765 vcpu->arch.virtual_tsc_shift); 1766 tsc += vcpu->arch.this_tsc_write; 1767 return tsc; 1768 } 1769 1770 static inline int gtod_is_based_on_tsc(int mode) 1771 { 1772 return mode == VCLOCK_TSC || mode == VCLOCK_HVCLOCK; 1773 } 1774 1775 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu) 1776 { 1777 #ifdef CONFIG_X86_64 1778 bool vcpus_matched; 1779 struct kvm_arch *ka = &vcpu->kvm->arch; 1780 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1781 1782 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 1783 atomic_read(&vcpu->kvm->online_vcpus)); 1784 1785 /* 1786 * Once the masterclock is enabled, always perform request in 1787 * order to update it. 1788 * 1789 * In order to enable masterclock, the host clocksource must be TSC 1790 * and the vcpus need to have matched TSCs. When that happens, 1791 * perform request to enable masterclock. 1792 */ 1793 if (ka->use_master_clock || 1794 (gtod_is_based_on_tsc(gtod->clock.vclock_mode) && vcpus_matched)) 1795 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 1796 1797 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc, 1798 atomic_read(&vcpu->kvm->online_vcpus), 1799 ka->use_master_clock, gtod->clock.vclock_mode); 1800 #endif 1801 } 1802 1803 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset) 1804 { 1805 u64 curr_offset = kvm_x86_ops->read_l1_tsc_offset(vcpu); 1806 vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset; 1807 } 1808 1809 /* 1810 * Multiply tsc by a fixed point number represented by ratio. 1811 * 1812 * The most significant 64-N bits (mult) of ratio represent the 1813 * integral part of the fixed point number; the remaining N bits 1814 * (frac) represent the fractional part, ie. ratio represents a fixed 1815 * point number (mult + frac * 2^(-N)). 1816 * 1817 * N equals to kvm_tsc_scaling_ratio_frac_bits. 1818 */ 1819 static inline u64 __scale_tsc(u64 ratio, u64 tsc) 1820 { 1821 return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits); 1822 } 1823 1824 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc) 1825 { 1826 u64 _tsc = tsc; 1827 u64 ratio = vcpu->arch.tsc_scaling_ratio; 1828 1829 if (ratio != kvm_default_tsc_scaling_ratio) 1830 _tsc = __scale_tsc(ratio, tsc); 1831 1832 return _tsc; 1833 } 1834 EXPORT_SYMBOL_GPL(kvm_scale_tsc); 1835 1836 static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) 1837 { 1838 u64 tsc; 1839 1840 tsc = kvm_scale_tsc(vcpu, rdtsc()); 1841 1842 return target_tsc - tsc; 1843 } 1844 1845 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc) 1846 { 1847 u64 tsc_offset = kvm_x86_ops->read_l1_tsc_offset(vcpu); 1848 1849 return tsc_offset + kvm_scale_tsc(vcpu, host_tsc); 1850 } 1851 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc); 1852 1853 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) 1854 { 1855 vcpu->arch.tsc_offset = kvm_x86_ops->write_l1_tsc_offset(vcpu, offset); 1856 } 1857 1858 static inline bool kvm_check_tsc_unstable(void) 1859 { 1860 #ifdef CONFIG_X86_64 1861 /* 1862 * TSC is marked unstable when we're running on Hyper-V, 1863 * 'TSC page' clocksource is good. 1864 */ 1865 if (pvclock_gtod_data.clock.vclock_mode == VCLOCK_HVCLOCK) 1866 return false; 1867 #endif 1868 return check_tsc_unstable(); 1869 } 1870 1871 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr) 1872 { 1873 struct kvm *kvm = vcpu->kvm; 1874 u64 offset, ns, elapsed; 1875 unsigned long flags; 1876 bool matched; 1877 bool already_matched; 1878 u64 data = msr->data; 1879 bool synchronizing = false; 1880 1881 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); 1882 offset = kvm_compute_tsc_offset(vcpu, data); 1883 ns = ktime_get_boottime_ns(); 1884 elapsed = ns - kvm->arch.last_tsc_nsec; 1885 1886 if (vcpu->arch.virtual_tsc_khz) { 1887 if (data == 0 && msr->host_initiated) { 1888 /* 1889 * detection of vcpu initialization -- need to sync 1890 * with other vCPUs. This particularly helps to keep 1891 * kvm_clock stable after CPU hotplug 1892 */ 1893 synchronizing = true; 1894 } else { 1895 u64 tsc_exp = kvm->arch.last_tsc_write + 1896 nsec_to_cycles(vcpu, elapsed); 1897 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL; 1898 /* 1899 * Special case: TSC write with a small delta (1 second) 1900 * of virtual cycle time against real time is 1901 * interpreted as an attempt to synchronize the CPU. 1902 */ 1903 synchronizing = data < tsc_exp + tsc_hz && 1904 data + tsc_hz > tsc_exp; 1905 } 1906 } 1907 1908 /* 1909 * For a reliable TSC, we can match TSC offsets, and for an unstable 1910 * TSC, we add elapsed time in this computation. We could let the 1911 * compensation code attempt to catch up if we fall behind, but 1912 * it's better to try to match offsets from the beginning. 1913 */ 1914 if (synchronizing && 1915 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) { 1916 if (!kvm_check_tsc_unstable()) { 1917 offset = kvm->arch.cur_tsc_offset; 1918 } else { 1919 u64 delta = nsec_to_cycles(vcpu, elapsed); 1920 data += delta; 1921 offset = kvm_compute_tsc_offset(vcpu, data); 1922 } 1923 matched = true; 1924 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation); 1925 } else { 1926 /* 1927 * We split periods of matched TSC writes into generations. 1928 * For each generation, we track the original measured 1929 * nanosecond time, offset, and write, so if TSCs are in 1930 * sync, we can match exact offset, and if not, we can match 1931 * exact software computation in compute_guest_tsc() 1932 * 1933 * These values are tracked in kvm->arch.cur_xxx variables. 1934 */ 1935 kvm->arch.cur_tsc_generation++; 1936 kvm->arch.cur_tsc_nsec = ns; 1937 kvm->arch.cur_tsc_write = data; 1938 kvm->arch.cur_tsc_offset = offset; 1939 matched = false; 1940 } 1941 1942 /* 1943 * We also track th most recent recorded KHZ, write and time to 1944 * allow the matching interval to be extended at each write. 1945 */ 1946 kvm->arch.last_tsc_nsec = ns; 1947 kvm->arch.last_tsc_write = data; 1948 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz; 1949 1950 vcpu->arch.last_guest_tsc = data; 1951 1952 /* Keep track of which generation this VCPU has synchronized to */ 1953 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation; 1954 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec; 1955 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write; 1956 1957 if (!msr->host_initiated && guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) 1958 update_ia32_tsc_adjust_msr(vcpu, offset); 1959 1960 kvm_vcpu_write_tsc_offset(vcpu, offset); 1961 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); 1962 1963 spin_lock(&kvm->arch.pvclock_gtod_sync_lock); 1964 if (!matched) { 1965 kvm->arch.nr_vcpus_matched_tsc = 0; 1966 } else if (!already_matched) { 1967 kvm->arch.nr_vcpus_matched_tsc++; 1968 } 1969 1970 kvm_track_tsc_matching(vcpu); 1971 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock); 1972 } 1973 1974 EXPORT_SYMBOL_GPL(kvm_write_tsc); 1975 1976 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, 1977 s64 adjustment) 1978 { 1979 u64 tsc_offset = kvm_x86_ops->read_l1_tsc_offset(vcpu); 1980 kvm_vcpu_write_tsc_offset(vcpu, tsc_offset + adjustment); 1981 } 1982 1983 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment) 1984 { 1985 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio) 1986 WARN_ON(adjustment < 0); 1987 adjustment = kvm_scale_tsc(vcpu, (u64) adjustment); 1988 adjust_tsc_offset_guest(vcpu, adjustment); 1989 } 1990 1991 #ifdef CONFIG_X86_64 1992 1993 static u64 read_tsc(void) 1994 { 1995 u64 ret = (u64)rdtsc_ordered(); 1996 u64 last = pvclock_gtod_data.clock.cycle_last; 1997 1998 if (likely(ret >= last)) 1999 return ret; 2000 2001 /* 2002 * GCC likes to generate cmov here, but this branch is extremely 2003 * predictable (it's just a function of time and the likely is 2004 * very likely) and there's a data dependence, so force GCC 2005 * to generate a branch instead. I don't barrier() because 2006 * we don't actually need a barrier, and if this function 2007 * ever gets inlined it will generate worse code. 2008 */ 2009 asm volatile (""); 2010 return last; 2011 } 2012 2013 static inline u64 vgettsc(u64 *tsc_timestamp, int *mode) 2014 { 2015 long v; 2016 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2017 u64 tsc_pg_val; 2018 2019 switch (gtod->clock.vclock_mode) { 2020 case VCLOCK_HVCLOCK: 2021 tsc_pg_val = hv_read_tsc_page_tsc(hv_get_tsc_page(), 2022 tsc_timestamp); 2023 if (tsc_pg_val != U64_MAX) { 2024 /* TSC page valid */ 2025 *mode = VCLOCK_HVCLOCK; 2026 v = (tsc_pg_val - gtod->clock.cycle_last) & 2027 gtod->clock.mask; 2028 } else { 2029 /* TSC page invalid */ 2030 *mode = VCLOCK_NONE; 2031 } 2032 break; 2033 case VCLOCK_TSC: 2034 *mode = VCLOCK_TSC; 2035 *tsc_timestamp = read_tsc(); 2036 v = (*tsc_timestamp - gtod->clock.cycle_last) & 2037 gtod->clock.mask; 2038 break; 2039 default: 2040 *mode = VCLOCK_NONE; 2041 } 2042 2043 if (*mode == VCLOCK_NONE) 2044 *tsc_timestamp = v = 0; 2045 2046 return v * gtod->clock.mult; 2047 } 2048 2049 static int do_monotonic_boot(s64 *t, u64 *tsc_timestamp) 2050 { 2051 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2052 unsigned long seq; 2053 int mode; 2054 u64 ns; 2055 2056 do { 2057 seq = read_seqcount_begin(>od->seq); 2058 ns = gtod->nsec_base; 2059 ns += vgettsc(tsc_timestamp, &mode); 2060 ns >>= gtod->clock.shift; 2061 ns += gtod->boot_ns; 2062 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 2063 *t = ns; 2064 2065 return mode; 2066 } 2067 2068 static int do_realtime(struct timespec64 *ts, u64 *tsc_timestamp) 2069 { 2070 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 2071 unsigned long seq; 2072 int mode; 2073 u64 ns; 2074 2075 do { 2076 seq = read_seqcount_begin(>od->seq); 2077 ts->tv_sec = gtod->wall_time_sec; 2078 ns = gtod->nsec_base; 2079 ns += vgettsc(tsc_timestamp, &mode); 2080 ns >>= gtod->clock.shift; 2081 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 2082 2083 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns); 2084 ts->tv_nsec = ns; 2085 2086 return mode; 2087 } 2088 2089 /* returns true if host is using TSC based clocksource */ 2090 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp) 2091 { 2092 /* checked again under seqlock below */ 2093 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 2094 return false; 2095 2096 return gtod_is_based_on_tsc(do_monotonic_boot(kernel_ns, 2097 tsc_timestamp)); 2098 } 2099 2100 /* returns true if host is using TSC based clocksource */ 2101 static bool kvm_get_walltime_and_clockread(struct timespec64 *ts, 2102 u64 *tsc_timestamp) 2103 { 2104 /* checked again under seqlock below */ 2105 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 2106 return false; 2107 2108 return gtod_is_based_on_tsc(do_realtime(ts, tsc_timestamp)); 2109 } 2110 #endif 2111 2112 /* 2113 * 2114 * Assuming a stable TSC across physical CPUS, and a stable TSC 2115 * across virtual CPUs, the following condition is possible. 2116 * Each numbered line represents an event visible to both 2117 * CPUs at the next numbered event. 2118 * 2119 * "timespecX" represents host monotonic time. "tscX" represents 2120 * RDTSC value. 2121 * 2122 * VCPU0 on CPU0 | VCPU1 on CPU1 2123 * 2124 * 1. read timespec0,tsc0 2125 * 2. | timespec1 = timespec0 + N 2126 * | tsc1 = tsc0 + M 2127 * 3. transition to guest | transition to guest 2128 * 4. ret0 = timespec0 + (rdtsc - tsc0) | 2129 * 5. | ret1 = timespec1 + (rdtsc - tsc1) 2130 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M)) 2131 * 2132 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity: 2133 * 2134 * - ret0 < ret1 2135 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M)) 2136 * ... 2137 * - 0 < N - M => M < N 2138 * 2139 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not 2140 * always the case (the difference between two distinct xtime instances 2141 * might be smaller then the difference between corresponding TSC reads, 2142 * when updating guest vcpus pvclock areas). 2143 * 2144 * To avoid that problem, do not allow visibility of distinct 2145 * system_timestamp/tsc_timestamp values simultaneously: use a master 2146 * copy of host monotonic time values. Update that master copy 2147 * in lockstep. 2148 * 2149 * Rely on synchronization of host TSCs and guest TSCs for monotonicity. 2150 * 2151 */ 2152 2153 static void pvclock_update_vm_gtod_copy(struct kvm *kvm) 2154 { 2155 #ifdef CONFIG_X86_64 2156 struct kvm_arch *ka = &kvm->arch; 2157 int vclock_mode; 2158 bool host_tsc_clocksource, vcpus_matched; 2159 2160 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 2161 atomic_read(&kvm->online_vcpus)); 2162 2163 /* 2164 * If the host uses TSC clock, then passthrough TSC as stable 2165 * to the guest. 2166 */ 2167 host_tsc_clocksource = kvm_get_time_and_clockread( 2168 &ka->master_kernel_ns, 2169 &ka->master_cycle_now); 2170 2171 ka->use_master_clock = host_tsc_clocksource && vcpus_matched 2172 && !ka->backwards_tsc_observed 2173 && !ka->boot_vcpu_runs_old_kvmclock; 2174 2175 if (ka->use_master_clock) 2176 atomic_set(&kvm_guest_has_master_clock, 1); 2177 2178 vclock_mode = pvclock_gtod_data.clock.vclock_mode; 2179 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode, 2180 vcpus_matched); 2181 #endif 2182 } 2183 2184 void kvm_make_mclock_inprogress_request(struct kvm *kvm) 2185 { 2186 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); 2187 } 2188 2189 static void kvm_gen_update_masterclock(struct kvm *kvm) 2190 { 2191 #ifdef CONFIG_X86_64 2192 int i; 2193 struct kvm_vcpu *vcpu; 2194 struct kvm_arch *ka = &kvm->arch; 2195 2196 spin_lock(&ka->pvclock_gtod_sync_lock); 2197 kvm_make_mclock_inprogress_request(kvm); 2198 /* no guest entries from this point */ 2199 pvclock_update_vm_gtod_copy(kvm); 2200 2201 kvm_for_each_vcpu(i, vcpu, kvm) 2202 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2203 2204 /* guest entries allowed */ 2205 kvm_for_each_vcpu(i, vcpu, kvm) 2206 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 2207 2208 spin_unlock(&ka->pvclock_gtod_sync_lock); 2209 #endif 2210 } 2211 2212 u64 get_kvmclock_ns(struct kvm *kvm) 2213 { 2214 struct kvm_arch *ka = &kvm->arch; 2215 struct pvclock_vcpu_time_info hv_clock; 2216 u64 ret; 2217 2218 spin_lock(&ka->pvclock_gtod_sync_lock); 2219 if (!ka->use_master_clock) { 2220 spin_unlock(&ka->pvclock_gtod_sync_lock); 2221 return ktime_get_boottime_ns() + ka->kvmclock_offset; 2222 } 2223 2224 hv_clock.tsc_timestamp = ka->master_cycle_now; 2225 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; 2226 spin_unlock(&ka->pvclock_gtod_sync_lock); 2227 2228 /* both __this_cpu_read() and rdtsc() should be on the same cpu */ 2229 get_cpu(); 2230 2231 if (__this_cpu_read(cpu_tsc_khz)) { 2232 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL, 2233 &hv_clock.tsc_shift, 2234 &hv_clock.tsc_to_system_mul); 2235 ret = __pvclock_read_cycles(&hv_clock, rdtsc()); 2236 } else 2237 ret = ktime_get_boottime_ns() + ka->kvmclock_offset; 2238 2239 put_cpu(); 2240 2241 return ret; 2242 } 2243 2244 static void kvm_setup_pvclock_page(struct kvm_vcpu *v) 2245 { 2246 struct kvm_vcpu_arch *vcpu = &v->arch; 2247 struct pvclock_vcpu_time_info guest_hv_clock; 2248 2249 if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time, 2250 &guest_hv_clock, sizeof(guest_hv_clock)))) 2251 return; 2252 2253 /* This VCPU is paused, but it's legal for a guest to read another 2254 * VCPU's kvmclock, so we really have to follow the specification where 2255 * it says that version is odd if data is being modified, and even after 2256 * it is consistent. 2257 * 2258 * Version field updates must be kept separate. This is because 2259 * kvm_write_guest_cached might use a "rep movs" instruction, and 2260 * writes within a string instruction are weakly ordered. So there 2261 * are three writes overall. 2262 * 2263 * As a small optimization, only write the version field in the first 2264 * and third write. The vcpu->pv_time cache is still valid, because the 2265 * version field is the first in the struct. 2266 */ 2267 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0); 2268 2269 if (guest_hv_clock.version & 1) 2270 ++guest_hv_clock.version; /* first time write, random junk */ 2271 2272 vcpu->hv_clock.version = guest_hv_clock.version + 1; 2273 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2274 &vcpu->hv_clock, 2275 sizeof(vcpu->hv_clock.version)); 2276 2277 smp_wmb(); 2278 2279 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */ 2280 vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED); 2281 2282 if (vcpu->pvclock_set_guest_stopped_request) { 2283 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED; 2284 vcpu->pvclock_set_guest_stopped_request = false; 2285 } 2286 2287 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock); 2288 2289 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2290 &vcpu->hv_clock, 2291 sizeof(vcpu->hv_clock)); 2292 2293 smp_wmb(); 2294 2295 vcpu->hv_clock.version++; 2296 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2297 &vcpu->hv_clock, 2298 sizeof(vcpu->hv_clock.version)); 2299 } 2300 2301 static int kvm_guest_time_update(struct kvm_vcpu *v) 2302 { 2303 unsigned long flags, tgt_tsc_khz; 2304 struct kvm_vcpu_arch *vcpu = &v->arch; 2305 struct kvm_arch *ka = &v->kvm->arch; 2306 s64 kernel_ns; 2307 u64 tsc_timestamp, host_tsc; 2308 u8 pvclock_flags; 2309 bool use_master_clock; 2310 2311 kernel_ns = 0; 2312 host_tsc = 0; 2313 2314 /* 2315 * If the host uses TSC clock, then passthrough TSC as stable 2316 * to the guest. 2317 */ 2318 spin_lock(&ka->pvclock_gtod_sync_lock); 2319 use_master_clock = ka->use_master_clock; 2320 if (use_master_clock) { 2321 host_tsc = ka->master_cycle_now; 2322 kernel_ns = ka->master_kernel_ns; 2323 } 2324 spin_unlock(&ka->pvclock_gtod_sync_lock); 2325 2326 /* Keep irq disabled to prevent changes to the clock */ 2327 local_irq_save(flags); 2328 tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz); 2329 if (unlikely(tgt_tsc_khz == 0)) { 2330 local_irq_restore(flags); 2331 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2332 return 1; 2333 } 2334 if (!use_master_clock) { 2335 host_tsc = rdtsc(); 2336 kernel_ns = ktime_get_boottime_ns(); 2337 } 2338 2339 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc); 2340 2341 /* 2342 * We may have to catch up the TSC to match elapsed wall clock 2343 * time for two reasons, even if kvmclock is used. 2344 * 1) CPU could have been running below the maximum TSC rate 2345 * 2) Broken TSC compensation resets the base at each VCPU 2346 * entry to avoid unknown leaps of TSC even when running 2347 * again on the same CPU. This may cause apparent elapsed 2348 * time to disappear, and the guest to stand still or run 2349 * very slowly. 2350 */ 2351 if (vcpu->tsc_catchup) { 2352 u64 tsc = compute_guest_tsc(v, kernel_ns); 2353 if (tsc > tsc_timestamp) { 2354 adjust_tsc_offset_guest(v, tsc - tsc_timestamp); 2355 tsc_timestamp = tsc; 2356 } 2357 } 2358 2359 local_irq_restore(flags); 2360 2361 /* With all the info we got, fill in the values */ 2362 2363 if (kvm_has_tsc_control) 2364 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz); 2365 2366 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) { 2367 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL, 2368 &vcpu->hv_clock.tsc_shift, 2369 &vcpu->hv_clock.tsc_to_system_mul); 2370 vcpu->hw_tsc_khz = tgt_tsc_khz; 2371 } 2372 2373 vcpu->hv_clock.tsc_timestamp = tsc_timestamp; 2374 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; 2375 vcpu->last_guest_tsc = tsc_timestamp; 2376 2377 /* If the host uses TSC clocksource, then it is stable */ 2378 pvclock_flags = 0; 2379 if (use_master_clock) 2380 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT; 2381 2382 vcpu->hv_clock.flags = pvclock_flags; 2383 2384 if (vcpu->pv_time_enabled) 2385 kvm_setup_pvclock_page(v); 2386 if (v == kvm_get_vcpu(v->kvm, 0)) 2387 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock); 2388 return 0; 2389 } 2390 2391 /* 2392 * kvmclock updates which are isolated to a given vcpu, such as 2393 * vcpu->cpu migration, should not allow system_timestamp from 2394 * the rest of the vcpus to remain static. Otherwise ntp frequency 2395 * correction applies to one vcpu's system_timestamp but not 2396 * the others. 2397 * 2398 * So in those cases, request a kvmclock update for all vcpus. 2399 * We need to rate-limit these requests though, as they can 2400 * considerably slow guests that have a large number of vcpus. 2401 * The time for a remote vcpu to update its kvmclock is bound 2402 * by the delay we use to rate-limit the updates. 2403 */ 2404 2405 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100) 2406 2407 static void kvmclock_update_fn(struct work_struct *work) 2408 { 2409 int i; 2410 struct delayed_work *dwork = to_delayed_work(work); 2411 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2412 kvmclock_update_work); 2413 struct kvm *kvm = container_of(ka, struct kvm, arch); 2414 struct kvm_vcpu *vcpu; 2415 2416 kvm_for_each_vcpu(i, vcpu, kvm) { 2417 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2418 kvm_vcpu_kick(vcpu); 2419 } 2420 } 2421 2422 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v) 2423 { 2424 struct kvm *kvm = v->kvm; 2425 2426 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2427 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 2428 KVMCLOCK_UPDATE_DELAY); 2429 } 2430 2431 #define KVMCLOCK_SYNC_PERIOD (300 * HZ) 2432 2433 static void kvmclock_sync_fn(struct work_struct *work) 2434 { 2435 struct delayed_work *dwork = to_delayed_work(work); 2436 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2437 kvmclock_sync_work); 2438 struct kvm *kvm = container_of(ka, struct kvm, arch); 2439 2440 if (!kvmclock_periodic_sync) 2441 return; 2442 2443 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0); 2444 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 2445 KVMCLOCK_SYNC_PERIOD); 2446 } 2447 2448 /* 2449 * On AMD, HWCR[McStatusWrEn] controls whether setting MCi_STATUS results in #GP. 2450 */ 2451 static bool can_set_mci_status(struct kvm_vcpu *vcpu) 2452 { 2453 /* McStatusWrEn enabled? */ 2454 if (guest_cpuid_is_amd(vcpu)) 2455 return !!(vcpu->arch.msr_hwcr & BIT_ULL(18)); 2456 2457 return false; 2458 } 2459 2460 static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2461 { 2462 u64 mcg_cap = vcpu->arch.mcg_cap; 2463 unsigned bank_num = mcg_cap & 0xff; 2464 u32 msr = msr_info->index; 2465 u64 data = msr_info->data; 2466 2467 switch (msr) { 2468 case MSR_IA32_MCG_STATUS: 2469 vcpu->arch.mcg_status = data; 2470 break; 2471 case MSR_IA32_MCG_CTL: 2472 if (!(mcg_cap & MCG_CTL_P) && 2473 (data || !msr_info->host_initiated)) 2474 return 1; 2475 if (data != 0 && data != ~(u64)0) 2476 return 1; 2477 vcpu->arch.mcg_ctl = data; 2478 break; 2479 default: 2480 if (msr >= MSR_IA32_MC0_CTL && 2481 msr < MSR_IA32_MCx_CTL(bank_num)) { 2482 u32 offset = msr - MSR_IA32_MC0_CTL; 2483 /* only 0 or all 1s can be written to IA32_MCi_CTL 2484 * some Linux kernels though clear bit 10 in bank 4 to 2485 * workaround a BIOS/GART TBL issue on AMD K8s, ignore 2486 * this to avoid an uncatched #GP in the guest 2487 */ 2488 if ((offset & 0x3) == 0 && 2489 data != 0 && (data | (1 << 10)) != ~(u64)0) 2490 return -1; 2491 2492 /* MCi_STATUS */ 2493 if (!msr_info->host_initiated && 2494 (offset & 0x3) == 1 && data != 0) { 2495 if (!can_set_mci_status(vcpu)) 2496 return -1; 2497 } 2498 2499 vcpu->arch.mce_banks[offset] = data; 2500 break; 2501 } 2502 return 1; 2503 } 2504 return 0; 2505 } 2506 2507 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) 2508 { 2509 struct kvm *kvm = vcpu->kvm; 2510 int lm = is_long_mode(vcpu); 2511 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 2512 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; 2513 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 2514 : kvm->arch.xen_hvm_config.blob_size_32; 2515 u32 page_num = data & ~PAGE_MASK; 2516 u64 page_addr = data & PAGE_MASK; 2517 u8 *page; 2518 int r; 2519 2520 r = -E2BIG; 2521 if (page_num >= blob_size) 2522 goto out; 2523 r = -ENOMEM; 2524 page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE); 2525 if (IS_ERR(page)) { 2526 r = PTR_ERR(page); 2527 goto out; 2528 } 2529 if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) 2530 goto out_free; 2531 r = 0; 2532 out_free: 2533 kfree(page); 2534 out: 2535 return r; 2536 } 2537 2538 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) 2539 { 2540 gpa_t gpa = data & ~0x3f; 2541 2542 /* Bits 3:5 are reserved, Should be zero */ 2543 if (data & 0x38) 2544 return 1; 2545 2546 vcpu->arch.apf.msr_val = data; 2547 2548 if (!(data & KVM_ASYNC_PF_ENABLED)) { 2549 kvm_clear_async_pf_completion_queue(vcpu); 2550 kvm_async_pf_hash_reset(vcpu); 2551 return 0; 2552 } 2553 2554 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa, 2555 sizeof(u32))) 2556 return 1; 2557 2558 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); 2559 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT; 2560 kvm_async_pf_wakeup_all(vcpu); 2561 return 0; 2562 } 2563 2564 static void kvmclock_reset(struct kvm_vcpu *vcpu) 2565 { 2566 vcpu->arch.pv_time_enabled = false; 2567 vcpu->arch.time = 0; 2568 } 2569 2570 static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa) 2571 { 2572 ++vcpu->stat.tlb_flush; 2573 kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa); 2574 } 2575 2576 static void record_steal_time(struct kvm_vcpu *vcpu) 2577 { 2578 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 2579 return; 2580 2581 if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2582 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)))) 2583 return; 2584 2585 /* 2586 * Doing a TLB flush here, on the guest's behalf, can avoid 2587 * expensive IPIs. 2588 */ 2589 trace_kvm_pv_tlb_flush(vcpu->vcpu_id, 2590 vcpu->arch.st.steal.preempted & KVM_VCPU_FLUSH_TLB); 2591 if (xchg(&vcpu->arch.st.steal.preempted, 0) & KVM_VCPU_FLUSH_TLB) 2592 kvm_vcpu_flush_tlb(vcpu, false); 2593 2594 if (vcpu->arch.st.steal.version & 1) 2595 vcpu->arch.st.steal.version += 1; /* first time write, random junk */ 2596 2597 vcpu->arch.st.steal.version += 1; 2598 2599 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2600 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2601 2602 smp_wmb(); 2603 2604 vcpu->arch.st.steal.steal += current->sched_info.run_delay - 2605 vcpu->arch.st.last_steal; 2606 vcpu->arch.st.last_steal = current->sched_info.run_delay; 2607 2608 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2609 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2610 2611 smp_wmb(); 2612 2613 vcpu->arch.st.steal.version += 1; 2614 2615 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2616 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2617 } 2618 2619 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2620 { 2621 bool pr = false; 2622 u32 msr = msr_info->index; 2623 u64 data = msr_info->data; 2624 2625 switch (msr) { 2626 case MSR_AMD64_NB_CFG: 2627 case MSR_IA32_UCODE_WRITE: 2628 case MSR_VM_HSAVE_PA: 2629 case MSR_AMD64_PATCH_LOADER: 2630 case MSR_AMD64_BU_CFG2: 2631 case MSR_AMD64_DC_CFG: 2632 case MSR_F15H_EX_CFG: 2633 break; 2634 2635 case MSR_IA32_UCODE_REV: 2636 if (msr_info->host_initiated) 2637 vcpu->arch.microcode_version = data; 2638 break; 2639 case MSR_IA32_ARCH_CAPABILITIES: 2640 if (!msr_info->host_initiated) 2641 return 1; 2642 vcpu->arch.arch_capabilities = data; 2643 break; 2644 case MSR_EFER: 2645 return set_efer(vcpu, msr_info); 2646 case MSR_K7_HWCR: 2647 data &= ~(u64)0x40; /* ignore flush filter disable */ 2648 data &= ~(u64)0x100; /* ignore ignne emulation enable */ 2649 data &= ~(u64)0x8; /* ignore TLB cache disable */ 2650 2651 /* Handle McStatusWrEn */ 2652 if (data == BIT_ULL(18)) { 2653 vcpu->arch.msr_hwcr = data; 2654 } else if (data != 0) { 2655 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", 2656 data); 2657 return 1; 2658 } 2659 break; 2660 case MSR_FAM10H_MMIO_CONF_BASE: 2661 if (data != 0) { 2662 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " 2663 "0x%llx\n", data); 2664 return 1; 2665 } 2666 break; 2667 case MSR_IA32_DEBUGCTLMSR: 2668 if (!data) { 2669 /* We support the non-activated case already */ 2670 break; 2671 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { 2672 /* Values other than LBR and BTF are vendor-specific, 2673 thus reserved and should throw a #GP */ 2674 return 1; 2675 } 2676 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", 2677 __func__, data); 2678 break; 2679 case 0x200 ... 0x2ff: 2680 return kvm_mtrr_set_msr(vcpu, msr, data); 2681 case MSR_IA32_APICBASE: 2682 return kvm_set_apic_base(vcpu, msr_info); 2683 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2684 return kvm_x2apic_msr_write(vcpu, msr, data); 2685 case MSR_IA32_TSCDEADLINE: 2686 kvm_set_lapic_tscdeadline_msr(vcpu, data); 2687 break; 2688 case MSR_IA32_TSC_ADJUST: 2689 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) { 2690 if (!msr_info->host_initiated) { 2691 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr; 2692 adjust_tsc_offset_guest(vcpu, adj); 2693 } 2694 vcpu->arch.ia32_tsc_adjust_msr = data; 2695 } 2696 break; 2697 case MSR_IA32_MISC_ENABLE: 2698 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT) && 2699 ((vcpu->arch.ia32_misc_enable_msr ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) { 2700 if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3)) 2701 return 1; 2702 vcpu->arch.ia32_misc_enable_msr = data; 2703 kvm_update_cpuid(vcpu); 2704 } else { 2705 vcpu->arch.ia32_misc_enable_msr = data; 2706 } 2707 break; 2708 case MSR_IA32_SMBASE: 2709 if (!msr_info->host_initiated) 2710 return 1; 2711 vcpu->arch.smbase = data; 2712 break; 2713 case MSR_IA32_POWER_CTL: 2714 vcpu->arch.msr_ia32_power_ctl = data; 2715 break; 2716 case MSR_IA32_TSC: 2717 kvm_write_tsc(vcpu, msr_info); 2718 break; 2719 case MSR_SMI_COUNT: 2720 if (!msr_info->host_initiated) 2721 return 1; 2722 vcpu->arch.smi_count = data; 2723 break; 2724 case MSR_KVM_WALL_CLOCK_NEW: 2725 case MSR_KVM_WALL_CLOCK: 2726 vcpu->kvm->arch.wall_clock = data; 2727 kvm_write_wall_clock(vcpu->kvm, data); 2728 break; 2729 case MSR_KVM_SYSTEM_TIME_NEW: 2730 case MSR_KVM_SYSTEM_TIME: { 2731 struct kvm_arch *ka = &vcpu->kvm->arch; 2732 2733 if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) { 2734 bool tmp = (msr == MSR_KVM_SYSTEM_TIME); 2735 2736 if (ka->boot_vcpu_runs_old_kvmclock != tmp) 2737 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 2738 2739 ka->boot_vcpu_runs_old_kvmclock = tmp; 2740 } 2741 2742 vcpu->arch.time = data; 2743 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 2744 2745 /* we verify if the enable bit is set... */ 2746 vcpu->arch.pv_time_enabled = false; 2747 if (!(data & 1)) 2748 break; 2749 2750 if (!kvm_gfn_to_hva_cache_init(vcpu->kvm, 2751 &vcpu->arch.pv_time, data & ~1ULL, 2752 sizeof(struct pvclock_vcpu_time_info))) 2753 vcpu->arch.pv_time_enabled = true; 2754 2755 break; 2756 } 2757 case MSR_KVM_ASYNC_PF_EN: 2758 if (kvm_pv_enable_async_pf(vcpu, data)) 2759 return 1; 2760 break; 2761 case MSR_KVM_STEAL_TIME: 2762 2763 if (unlikely(!sched_info_on())) 2764 return 1; 2765 2766 if (data & KVM_STEAL_RESERVED_MASK) 2767 return 1; 2768 2769 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime, 2770 data & KVM_STEAL_VALID_BITS, 2771 sizeof(struct kvm_steal_time))) 2772 return 1; 2773 2774 vcpu->arch.st.msr_val = data; 2775 2776 if (!(data & KVM_MSR_ENABLED)) 2777 break; 2778 2779 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 2780 2781 break; 2782 case MSR_KVM_PV_EOI_EN: 2783 if (kvm_lapic_enable_pv_eoi(vcpu, data, sizeof(u8))) 2784 return 1; 2785 break; 2786 2787 case MSR_KVM_POLL_CONTROL: 2788 /* only enable bit supported */ 2789 if (data & (-1ULL << 1)) 2790 return 1; 2791 2792 vcpu->arch.msr_kvm_poll_control = data; 2793 break; 2794 2795 case MSR_IA32_MCG_CTL: 2796 case MSR_IA32_MCG_STATUS: 2797 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 2798 return set_msr_mce(vcpu, msr_info); 2799 2800 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2801 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2802 pr = true; /* fall through */ 2803 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2804 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2805 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2806 return kvm_pmu_set_msr(vcpu, msr_info); 2807 2808 if (pr || data != 0) 2809 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: " 2810 "0x%x data 0x%llx\n", msr, data); 2811 break; 2812 case MSR_K7_CLK_CTL: 2813 /* 2814 * Ignore all writes to this no longer documented MSR. 2815 * Writes are only relevant for old K7 processors, 2816 * all pre-dating SVM, but a recommended workaround from 2817 * AMD for these chips. It is possible to specify the 2818 * affected processor models on the command line, hence 2819 * the need to ignore the workaround. 2820 */ 2821 break; 2822 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 2823 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 2824 case HV_X64_MSR_CRASH_CTL: 2825 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 2826 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 2827 case HV_X64_MSR_TSC_EMULATION_CONTROL: 2828 case HV_X64_MSR_TSC_EMULATION_STATUS: 2829 return kvm_hv_set_msr_common(vcpu, msr, data, 2830 msr_info->host_initiated); 2831 case MSR_IA32_BBL_CR_CTL3: 2832 /* Drop writes to this legacy MSR -- see rdmsr 2833 * counterpart for further detail. 2834 */ 2835 if (report_ignored_msrs) 2836 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", 2837 msr, data); 2838 break; 2839 case MSR_AMD64_OSVW_ID_LENGTH: 2840 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2841 return 1; 2842 vcpu->arch.osvw.length = data; 2843 break; 2844 case MSR_AMD64_OSVW_STATUS: 2845 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2846 return 1; 2847 vcpu->arch.osvw.status = data; 2848 break; 2849 case MSR_PLATFORM_INFO: 2850 if (!msr_info->host_initiated || 2851 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) && 2852 cpuid_fault_enabled(vcpu))) 2853 return 1; 2854 vcpu->arch.msr_platform_info = data; 2855 break; 2856 case MSR_MISC_FEATURES_ENABLES: 2857 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT || 2858 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT && 2859 !supports_cpuid_fault(vcpu))) 2860 return 1; 2861 vcpu->arch.msr_misc_features_enables = data; 2862 break; 2863 default: 2864 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) 2865 return xen_hvm_config(vcpu, data); 2866 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2867 return kvm_pmu_set_msr(vcpu, msr_info); 2868 if (!ignore_msrs) { 2869 vcpu_debug_ratelimited(vcpu, "unhandled wrmsr: 0x%x data 0x%llx\n", 2870 msr, data); 2871 return 1; 2872 } else { 2873 if (report_ignored_msrs) 2874 vcpu_unimpl(vcpu, 2875 "ignored wrmsr: 0x%x data 0x%llx\n", 2876 msr, data); 2877 break; 2878 } 2879 } 2880 return 0; 2881 } 2882 EXPORT_SYMBOL_GPL(kvm_set_msr_common); 2883 2884 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) 2885 { 2886 u64 data; 2887 u64 mcg_cap = vcpu->arch.mcg_cap; 2888 unsigned bank_num = mcg_cap & 0xff; 2889 2890 switch (msr) { 2891 case MSR_IA32_P5_MC_ADDR: 2892 case MSR_IA32_P5_MC_TYPE: 2893 data = 0; 2894 break; 2895 case MSR_IA32_MCG_CAP: 2896 data = vcpu->arch.mcg_cap; 2897 break; 2898 case MSR_IA32_MCG_CTL: 2899 if (!(mcg_cap & MCG_CTL_P) && !host) 2900 return 1; 2901 data = vcpu->arch.mcg_ctl; 2902 break; 2903 case MSR_IA32_MCG_STATUS: 2904 data = vcpu->arch.mcg_status; 2905 break; 2906 default: 2907 if (msr >= MSR_IA32_MC0_CTL && 2908 msr < MSR_IA32_MCx_CTL(bank_num)) { 2909 u32 offset = msr - MSR_IA32_MC0_CTL; 2910 data = vcpu->arch.mce_banks[offset]; 2911 break; 2912 } 2913 return 1; 2914 } 2915 *pdata = data; 2916 return 0; 2917 } 2918 2919 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2920 { 2921 switch (msr_info->index) { 2922 case MSR_IA32_PLATFORM_ID: 2923 case MSR_IA32_EBL_CR_POWERON: 2924 case MSR_IA32_DEBUGCTLMSR: 2925 case MSR_IA32_LASTBRANCHFROMIP: 2926 case MSR_IA32_LASTBRANCHTOIP: 2927 case MSR_IA32_LASTINTFROMIP: 2928 case MSR_IA32_LASTINTTOIP: 2929 case MSR_K8_SYSCFG: 2930 case MSR_K8_TSEG_ADDR: 2931 case MSR_K8_TSEG_MASK: 2932 case MSR_VM_HSAVE_PA: 2933 case MSR_K8_INT_PENDING_MSG: 2934 case MSR_AMD64_NB_CFG: 2935 case MSR_FAM10H_MMIO_CONF_BASE: 2936 case MSR_AMD64_BU_CFG2: 2937 case MSR_IA32_PERF_CTL: 2938 case MSR_AMD64_DC_CFG: 2939 case MSR_F15H_EX_CFG: 2940 msr_info->data = 0; 2941 break; 2942 case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5: 2943 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2944 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2945 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2946 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2947 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 2948 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 2949 msr_info->data = 0; 2950 break; 2951 case MSR_IA32_UCODE_REV: 2952 msr_info->data = vcpu->arch.microcode_version; 2953 break; 2954 case MSR_IA32_ARCH_CAPABILITIES: 2955 if (!msr_info->host_initiated && 2956 !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES)) 2957 return 1; 2958 msr_info->data = vcpu->arch.arch_capabilities; 2959 break; 2960 case MSR_IA32_POWER_CTL: 2961 msr_info->data = vcpu->arch.msr_ia32_power_ctl; 2962 break; 2963 case MSR_IA32_TSC: 2964 msr_info->data = kvm_scale_tsc(vcpu, rdtsc()) + vcpu->arch.tsc_offset; 2965 break; 2966 case MSR_MTRRcap: 2967 case 0x200 ... 0x2ff: 2968 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data); 2969 case 0xcd: /* fsb frequency */ 2970 msr_info->data = 3; 2971 break; 2972 /* 2973 * MSR_EBC_FREQUENCY_ID 2974 * Conservative value valid for even the basic CPU models. 2975 * Models 0,1: 000 in bits 23:21 indicating a bus speed of 2976 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, 2977 * and 266MHz for model 3, or 4. Set Core Clock 2978 * Frequency to System Bus Frequency Ratio to 1 (bits 2979 * 31:24) even though these are only valid for CPU 2980 * models > 2, however guests may end up dividing or 2981 * multiplying by zero otherwise. 2982 */ 2983 case MSR_EBC_FREQUENCY_ID: 2984 msr_info->data = 1 << 24; 2985 break; 2986 case MSR_IA32_APICBASE: 2987 msr_info->data = kvm_get_apic_base(vcpu); 2988 break; 2989 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2990 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data); 2991 break; 2992 case MSR_IA32_TSCDEADLINE: 2993 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu); 2994 break; 2995 case MSR_IA32_TSC_ADJUST: 2996 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr; 2997 break; 2998 case MSR_IA32_MISC_ENABLE: 2999 msr_info->data = vcpu->arch.ia32_misc_enable_msr; 3000 break; 3001 case MSR_IA32_SMBASE: 3002 if (!msr_info->host_initiated) 3003 return 1; 3004 msr_info->data = vcpu->arch.smbase; 3005 break; 3006 case MSR_SMI_COUNT: 3007 msr_info->data = vcpu->arch.smi_count; 3008 break; 3009 case MSR_IA32_PERF_STATUS: 3010 /* TSC increment by tick */ 3011 msr_info->data = 1000ULL; 3012 /* CPU multiplier */ 3013 msr_info->data |= (((uint64_t)4ULL) << 40); 3014 break; 3015 case MSR_EFER: 3016 msr_info->data = vcpu->arch.efer; 3017 break; 3018 case MSR_KVM_WALL_CLOCK: 3019 case MSR_KVM_WALL_CLOCK_NEW: 3020 msr_info->data = vcpu->kvm->arch.wall_clock; 3021 break; 3022 case MSR_KVM_SYSTEM_TIME: 3023 case MSR_KVM_SYSTEM_TIME_NEW: 3024 msr_info->data = vcpu->arch.time; 3025 break; 3026 case MSR_KVM_ASYNC_PF_EN: 3027 msr_info->data = vcpu->arch.apf.msr_val; 3028 break; 3029 case MSR_KVM_STEAL_TIME: 3030 msr_info->data = vcpu->arch.st.msr_val; 3031 break; 3032 case MSR_KVM_PV_EOI_EN: 3033 msr_info->data = vcpu->arch.pv_eoi.msr_val; 3034 break; 3035 case MSR_KVM_POLL_CONTROL: 3036 msr_info->data = vcpu->arch.msr_kvm_poll_control; 3037 break; 3038 case MSR_IA32_P5_MC_ADDR: 3039 case MSR_IA32_P5_MC_TYPE: 3040 case MSR_IA32_MCG_CAP: 3041 case MSR_IA32_MCG_CTL: 3042 case MSR_IA32_MCG_STATUS: 3043 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 3044 return get_msr_mce(vcpu, msr_info->index, &msr_info->data, 3045 msr_info->host_initiated); 3046 case MSR_K7_CLK_CTL: 3047 /* 3048 * Provide expected ramp-up count for K7. All other 3049 * are set to zero, indicating minimum divisors for 3050 * every field. 3051 * 3052 * This prevents guest kernels on AMD host with CPU 3053 * type 6, model 8 and higher from exploding due to 3054 * the rdmsr failing. 3055 */ 3056 msr_info->data = 0x20000000; 3057 break; 3058 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 3059 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 3060 case HV_X64_MSR_CRASH_CTL: 3061 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 3062 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 3063 case HV_X64_MSR_TSC_EMULATION_CONTROL: 3064 case HV_X64_MSR_TSC_EMULATION_STATUS: 3065 return kvm_hv_get_msr_common(vcpu, 3066 msr_info->index, &msr_info->data, 3067 msr_info->host_initiated); 3068 break; 3069 case MSR_IA32_BBL_CR_CTL3: 3070 /* This legacy MSR exists but isn't fully documented in current 3071 * silicon. It is however accessed by winxp in very narrow 3072 * scenarios where it sets bit #19, itself documented as 3073 * a "reserved" bit. Best effort attempt to source coherent 3074 * read data here should the balance of the register be 3075 * interpreted by the guest: 3076 * 3077 * L2 cache control register 3: 64GB range, 256KB size, 3078 * enabled, latency 0x1, configured 3079 */ 3080 msr_info->data = 0xbe702111; 3081 break; 3082 case MSR_AMD64_OSVW_ID_LENGTH: 3083 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3084 return 1; 3085 msr_info->data = vcpu->arch.osvw.length; 3086 break; 3087 case MSR_AMD64_OSVW_STATUS: 3088 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 3089 return 1; 3090 msr_info->data = vcpu->arch.osvw.status; 3091 break; 3092 case MSR_PLATFORM_INFO: 3093 if (!msr_info->host_initiated && 3094 !vcpu->kvm->arch.guest_can_read_msr_platform_info) 3095 return 1; 3096 msr_info->data = vcpu->arch.msr_platform_info; 3097 break; 3098 case MSR_MISC_FEATURES_ENABLES: 3099 msr_info->data = vcpu->arch.msr_misc_features_enables; 3100 break; 3101 case MSR_K7_HWCR: 3102 msr_info->data = vcpu->arch.msr_hwcr; 3103 break; 3104 default: 3105 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 3106 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 3107 if (!ignore_msrs) { 3108 vcpu_debug_ratelimited(vcpu, "unhandled rdmsr: 0x%x\n", 3109 msr_info->index); 3110 return 1; 3111 } else { 3112 if (report_ignored_msrs) 3113 vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", 3114 msr_info->index); 3115 msr_info->data = 0; 3116 } 3117 break; 3118 } 3119 return 0; 3120 } 3121 EXPORT_SYMBOL_GPL(kvm_get_msr_common); 3122 3123 /* 3124 * Read or write a bunch of msrs. All parameters are kernel addresses. 3125 * 3126 * @return number of msrs set successfully. 3127 */ 3128 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, 3129 struct kvm_msr_entry *entries, 3130 int (*do_msr)(struct kvm_vcpu *vcpu, 3131 unsigned index, u64 *data)) 3132 { 3133 int i; 3134 3135 for (i = 0; i < msrs->nmsrs; ++i) 3136 if (do_msr(vcpu, entries[i].index, &entries[i].data)) 3137 break; 3138 3139 return i; 3140 } 3141 3142 /* 3143 * Read or write a bunch of msrs. Parameters are user addresses. 3144 * 3145 * @return number of msrs set successfully. 3146 */ 3147 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, 3148 int (*do_msr)(struct kvm_vcpu *vcpu, 3149 unsigned index, u64 *data), 3150 int writeback) 3151 { 3152 struct kvm_msrs msrs; 3153 struct kvm_msr_entry *entries; 3154 int r, n; 3155 unsigned size; 3156 3157 r = -EFAULT; 3158 if (copy_from_user(&msrs, user_msrs, sizeof(msrs))) 3159 goto out; 3160 3161 r = -E2BIG; 3162 if (msrs.nmsrs >= MAX_IO_MSRS) 3163 goto out; 3164 3165 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; 3166 entries = memdup_user(user_msrs->entries, size); 3167 if (IS_ERR(entries)) { 3168 r = PTR_ERR(entries); 3169 goto out; 3170 } 3171 3172 r = n = __msr_io(vcpu, &msrs, entries, do_msr); 3173 if (r < 0) 3174 goto out_free; 3175 3176 r = -EFAULT; 3177 if (writeback && copy_to_user(user_msrs->entries, entries, size)) 3178 goto out_free; 3179 3180 r = n; 3181 3182 out_free: 3183 kfree(entries); 3184 out: 3185 return r; 3186 } 3187 3188 static inline bool kvm_can_mwait_in_guest(void) 3189 { 3190 return boot_cpu_has(X86_FEATURE_MWAIT) && 3191 !boot_cpu_has_bug(X86_BUG_MONITOR) && 3192 boot_cpu_has(X86_FEATURE_ARAT); 3193 } 3194 3195 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 3196 { 3197 int r = 0; 3198 3199 switch (ext) { 3200 case KVM_CAP_IRQCHIP: 3201 case KVM_CAP_HLT: 3202 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: 3203 case KVM_CAP_SET_TSS_ADDR: 3204 case KVM_CAP_EXT_CPUID: 3205 case KVM_CAP_EXT_EMUL_CPUID: 3206 case KVM_CAP_CLOCKSOURCE: 3207 case KVM_CAP_PIT: 3208 case KVM_CAP_NOP_IO_DELAY: 3209 case KVM_CAP_MP_STATE: 3210 case KVM_CAP_SYNC_MMU: 3211 case KVM_CAP_USER_NMI: 3212 case KVM_CAP_REINJECT_CONTROL: 3213 case KVM_CAP_IRQ_INJECT_STATUS: 3214 case KVM_CAP_IOEVENTFD: 3215 case KVM_CAP_IOEVENTFD_NO_LENGTH: 3216 case KVM_CAP_PIT2: 3217 case KVM_CAP_PIT_STATE2: 3218 case KVM_CAP_SET_IDENTITY_MAP_ADDR: 3219 case KVM_CAP_XEN_HVM: 3220 case KVM_CAP_VCPU_EVENTS: 3221 case KVM_CAP_HYPERV: 3222 case KVM_CAP_HYPERV_VAPIC: 3223 case KVM_CAP_HYPERV_SPIN: 3224 case KVM_CAP_HYPERV_SYNIC: 3225 case KVM_CAP_HYPERV_SYNIC2: 3226 case KVM_CAP_HYPERV_VP_INDEX: 3227 case KVM_CAP_HYPERV_EVENTFD: 3228 case KVM_CAP_HYPERV_TLBFLUSH: 3229 case KVM_CAP_HYPERV_SEND_IPI: 3230 case KVM_CAP_HYPERV_CPUID: 3231 case KVM_CAP_PCI_SEGMENT: 3232 case KVM_CAP_DEBUGREGS: 3233 case KVM_CAP_X86_ROBUST_SINGLESTEP: 3234 case KVM_CAP_XSAVE: 3235 case KVM_CAP_ASYNC_PF: 3236 case KVM_CAP_GET_TSC_KHZ: 3237 case KVM_CAP_KVMCLOCK_CTRL: 3238 case KVM_CAP_READONLY_MEM: 3239 case KVM_CAP_HYPERV_TIME: 3240 case KVM_CAP_IOAPIC_POLARITY_IGNORED: 3241 case KVM_CAP_TSC_DEADLINE_TIMER: 3242 case KVM_CAP_DISABLE_QUIRKS: 3243 case KVM_CAP_SET_BOOT_CPU_ID: 3244 case KVM_CAP_SPLIT_IRQCHIP: 3245 case KVM_CAP_IMMEDIATE_EXIT: 3246 case KVM_CAP_PMU_EVENT_FILTER: 3247 case KVM_CAP_GET_MSR_FEATURES: 3248 case KVM_CAP_MSR_PLATFORM_INFO: 3249 case KVM_CAP_EXCEPTION_PAYLOAD: 3250 r = 1; 3251 break; 3252 case KVM_CAP_SYNC_REGS: 3253 r = KVM_SYNC_X86_VALID_FIELDS; 3254 break; 3255 case KVM_CAP_ADJUST_CLOCK: 3256 r = KVM_CLOCK_TSC_STABLE; 3257 break; 3258 case KVM_CAP_X86_DISABLE_EXITS: 3259 r |= KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE | 3260 KVM_X86_DISABLE_EXITS_CSTATE; 3261 if(kvm_can_mwait_in_guest()) 3262 r |= KVM_X86_DISABLE_EXITS_MWAIT; 3263 break; 3264 case KVM_CAP_X86_SMM: 3265 /* SMBASE is usually relocated above 1M on modern chipsets, 3266 * and SMM handlers might indeed rely on 4G segment limits, 3267 * so do not report SMM to be available if real mode is 3268 * emulated via vm86 mode. Still, do not go to great lengths 3269 * to avoid userspace's usage of the feature, because it is a 3270 * fringe case that is not enabled except via specific settings 3271 * of the module parameters. 3272 */ 3273 r = kvm_x86_ops->has_emulated_msr(MSR_IA32_SMBASE); 3274 break; 3275 case KVM_CAP_VAPIC: 3276 r = !kvm_x86_ops->cpu_has_accelerated_tpr(); 3277 break; 3278 case KVM_CAP_NR_VCPUS: 3279 r = KVM_SOFT_MAX_VCPUS; 3280 break; 3281 case KVM_CAP_MAX_VCPUS: 3282 r = KVM_MAX_VCPUS; 3283 break; 3284 case KVM_CAP_MAX_VCPU_ID: 3285 r = KVM_MAX_VCPU_ID; 3286 break; 3287 case KVM_CAP_PV_MMU: /* obsolete */ 3288 r = 0; 3289 break; 3290 case KVM_CAP_MCE: 3291 r = KVM_MAX_MCE_BANKS; 3292 break; 3293 case KVM_CAP_XCRS: 3294 r = boot_cpu_has(X86_FEATURE_XSAVE); 3295 break; 3296 case KVM_CAP_TSC_CONTROL: 3297 r = kvm_has_tsc_control; 3298 break; 3299 case KVM_CAP_X2APIC_API: 3300 r = KVM_X2APIC_API_VALID_FLAGS; 3301 break; 3302 case KVM_CAP_NESTED_STATE: 3303 r = kvm_x86_ops->get_nested_state ? 3304 kvm_x86_ops->get_nested_state(NULL, NULL, 0) : 0; 3305 break; 3306 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: 3307 r = kvm_x86_ops->enable_direct_tlbflush != NULL; 3308 break; 3309 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS: 3310 r = kvm_x86_ops->nested_enable_evmcs != NULL; 3311 break; 3312 default: 3313 break; 3314 } 3315 return r; 3316 3317 } 3318 3319 long kvm_arch_dev_ioctl(struct file *filp, 3320 unsigned int ioctl, unsigned long arg) 3321 { 3322 void __user *argp = (void __user *)arg; 3323 long r; 3324 3325 switch (ioctl) { 3326 case KVM_GET_MSR_INDEX_LIST: { 3327 struct kvm_msr_list __user *user_msr_list = argp; 3328 struct kvm_msr_list msr_list; 3329 unsigned n; 3330 3331 r = -EFAULT; 3332 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list))) 3333 goto out; 3334 n = msr_list.nmsrs; 3335 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs; 3336 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list))) 3337 goto out; 3338 r = -E2BIG; 3339 if (n < msr_list.nmsrs) 3340 goto out; 3341 r = -EFAULT; 3342 if (copy_to_user(user_msr_list->indices, &msrs_to_save, 3343 num_msrs_to_save * sizeof(u32))) 3344 goto out; 3345 if (copy_to_user(user_msr_list->indices + num_msrs_to_save, 3346 &emulated_msrs, 3347 num_emulated_msrs * sizeof(u32))) 3348 goto out; 3349 r = 0; 3350 break; 3351 } 3352 case KVM_GET_SUPPORTED_CPUID: 3353 case KVM_GET_EMULATED_CPUID: { 3354 struct kvm_cpuid2 __user *cpuid_arg = argp; 3355 struct kvm_cpuid2 cpuid; 3356 3357 r = -EFAULT; 3358 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 3359 goto out; 3360 3361 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries, 3362 ioctl); 3363 if (r) 3364 goto out; 3365 3366 r = -EFAULT; 3367 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 3368 goto out; 3369 r = 0; 3370 break; 3371 } 3372 case KVM_X86_GET_MCE_CAP_SUPPORTED: { 3373 r = -EFAULT; 3374 if (copy_to_user(argp, &kvm_mce_cap_supported, 3375 sizeof(kvm_mce_cap_supported))) 3376 goto out; 3377 r = 0; 3378 break; 3379 case KVM_GET_MSR_FEATURE_INDEX_LIST: { 3380 struct kvm_msr_list __user *user_msr_list = argp; 3381 struct kvm_msr_list msr_list; 3382 unsigned int n; 3383 3384 r = -EFAULT; 3385 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list))) 3386 goto out; 3387 n = msr_list.nmsrs; 3388 msr_list.nmsrs = num_msr_based_features; 3389 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list))) 3390 goto out; 3391 r = -E2BIG; 3392 if (n < msr_list.nmsrs) 3393 goto out; 3394 r = -EFAULT; 3395 if (copy_to_user(user_msr_list->indices, &msr_based_features, 3396 num_msr_based_features * sizeof(u32))) 3397 goto out; 3398 r = 0; 3399 break; 3400 } 3401 case KVM_GET_MSRS: 3402 r = msr_io(NULL, argp, do_get_msr_feature, 1); 3403 break; 3404 } 3405 default: 3406 r = -EINVAL; 3407 } 3408 out: 3409 return r; 3410 } 3411 3412 static void wbinvd_ipi(void *garbage) 3413 { 3414 wbinvd(); 3415 } 3416 3417 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) 3418 { 3419 return kvm_arch_has_noncoherent_dma(vcpu->kvm); 3420 } 3421 3422 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3423 { 3424 /* Address WBINVD may be executed by guest */ 3425 if (need_emulate_wbinvd(vcpu)) { 3426 if (kvm_x86_ops->has_wbinvd_exit()) 3427 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 3428 else if (vcpu->cpu != -1 && vcpu->cpu != cpu) 3429 smp_call_function_single(vcpu->cpu, 3430 wbinvd_ipi, NULL, 1); 3431 } 3432 3433 kvm_x86_ops->vcpu_load(vcpu, cpu); 3434 3435 fpregs_assert_state_consistent(); 3436 if (test_thread_flag(TIF_NEED_FPU_LOAD)) 3437 switch_fpu_return(); 3438 3439 /* Apply any externally detected TSC adjustments (due to suspend) */ 3440 if (unlikely(vcpu->arch.tsc_offset_adjustment)) { 3441 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment); 3442 vcpu->arch.tsc_offset_adjustment = 0; 3443 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 3444 } 3445 3446 if (unlikely(vcpu->cpu != cpu) || kvm_check_tsc_unstable()) { 3447 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 : 3448 rdtsc() - vcpu->arch.last_host_tsc; 3449 if (tsc_delta < 0) 3450 mark_tsc_unstable("KVM discovered backwards TSC"); 3451 3452 if (kvm_check_tsc_unstable()) { 3453 u64 offset = kvm_compute_tsc_offset(vcpu, 3454 vcpu->arch.last_guest_tsc); 3455 kvm_vcpu_write_tsc_offset(vcpu, offset); 3456 vcpu->arch.tsc_catchup = 1; 3457 } 3458 3459 if (kvm_lapic_hv_timer_in_use(vcpu)) 3460 kvm_lapic_restart_hv_timer(vcpu); 3461 3462 /* 3463 * On a host with synchronized TSC, there is no need to update 3464 * kvmclock on vcpu->cpu migration 3465 */ 3466 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1) 3467 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 3468 if (vcpu->cpu != cpu) 3469 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu); 3470 vcpu->cpu = cpu; 3471 } 3472 3473 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 3474 } 3475 3476 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) 3477 { 3478 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 3479 return; 3480 3481 vcpu->arch.st.steal.preempted = KVM_VCPU_PREEMPTED; 3482 3483 kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime, 3484 &vcpu->arch.st.steal.preempted, 3485 offsetof(struct kvm_steal_time, preempted), 3486 sizeof(vcpu->arch.st.steal.preempted)); 3487 } 3488 3489 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 3490 { 3491 int idx; 3492 3493 if (vcpu->preempted) 3494 vcpu->arch.preempted_in_kernel = !kvm_x86_ops->get_cpl(vcpu); 3495 3496 /* 3497 * Disable page faults because we're in atomic context here. 3498 * kvm_write_guest_offset_cached() would call might_fault() 3499 * that relies on pagefault_disable() to tell if there's a 3500 * bug. NOTE: the write to guest memory may not go through if 3501 * during postcopy live migration or if there's heavy guest 3502 * paging. 3503 */ 3504 pagefault_disable(); 3505 /* 3506 * kvm_memslots() will be called by 3507 * kvm_write_guest_offset_cached() so take the srcu lock. 3508 */ 3509 idx = srcu_read_lock(&vcpu->kvm->srcu); 3510 kvm_steal_time_set_preempted(vcpu); 3511 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3512 pagefault_enable(); 3513 kvm_x86_ops->vcpu_put(vcpu); 3514 vcpu->arch.last_host_tsc = rdtsc(); 3515 /* 3516 * If userspace has set any breakpoints or watchpoints, dr6 is restored 3517 * on every vmexit, but if not, we might have a stale dr6 from the 3518 * guest. do_debug expects dr6 to be cleared after it runs, do the same. 3519 */ 3520 set_debugreg(0, 6); 3521 } 3522 3523 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, 3524 struct kvm_lapic_state *s) 3525 { 3526 if (vcpu->arch.apicv_active) 3527 kvm_x86_ops->sync_pir_to_irr(vcpu); 3528 3529 return kvm_apic_get_state(vcpu, s); 3530 } 3531 3532 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, 3533 struct kvm_lapic_state *s) 3534 { 3535 int r; 3536 3537 r = kvm_apic_set_state(vcpu, s); 3538 if (r) 3539 return r; 3540 update_cr8_intercept(vcpu); 3541 3542 return 0; 3543 } 3544 3545 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu) 3546 { 3547 return (!lapic_in_kernel(vcpu) || 3548 kvm_apic_accept_pic_intr(vcpu)); 3549 } 3550 3551 /* 3552 * if userspace requested an interrupt window, check that the 3553 * interrupt window is open. 3554 * 3555 * No need to exit to userspace if we already have an interrupt queued. 3556 */ 3557 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu) 3558 { 3559 return kvm_arch_interrupt_allowed(vcpu) && 3560 !kvm_cpu_has_interrupt(vcpu) && 3561 !kvm_event_needs_reinjection(vcpu) && 3562 kvm_cpu_accept_dm_intr(vcpu); 3563 } 3564 3565 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, 3566 struct kvm_interrupt *irq) 3567 { 3568 if (irq->irq >= KVM_NR_INTERRUPTS) 3569 return -EINVAL; 3570 3571 if (!irqchip_in_kernel(vcpu->kvm)) { 3572 kvm_queue_interrupt(vcpu, irq->irq, false); 3573 kvm_make_request(KVM_REQ_EVENT, vcpu); 3574 return 0; 3575 } 3576 3577 /* 3578 * With in-kernel LAPIC, we only use this to inject EXTINT, so 3579 * fail for in-kernel 8259. 3580 */ 3581 if (pic_in_kernel(vcpu->kvm)) 3582 return -ENXIO; 3583 3584 if (vcpu->arch.pending_external_vector != -1) 3585 return -EEXIST; 3586 3587 vcpu->arch.pending_external_vector = irq->irq; 3588 kvm_make_request(KVM_REQ_EVENT, vcpu); 3589 return 0; 3590 } 3591 3592 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) 3593 { 3594 kvm_inject_nmi(vcpu); 3595 3596 return 0; 3597 } 3598 3599 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu) 3600 { 3601 kvm_make_request(KVM_REQ_SMI, vcpu); 3602 3603 return 0; 3604 } 3605 3606 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, 3607 struct kvm_tpr_access_ctl *tac) 3608 { 3609 if (tac->flags) 3610 return -EINVAL; 3611 vcpu->arch.tpr_access_reporting = !!tac->enabled; 3612 return 0; 3613 } 3614 3615 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, 3616 u64 mcg_cap) 3617 { 3618 int r; 3619 unsigned bank_num = mcg_cap & 0xff, bank; 3620 3621 r = -EINVAL; 3622 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) 3623 goto out; 3624 if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000)) 3625 goto out; 3626 r = 0; 3627 vcpu->arch.mcg_cap = mcg_cap; 3628 /* Init IA32_MCG_CTL to all 1s */ 3629 if (mcg_cap & MCG_CTL_P) 3630 vcpu->arch.mcg_ctl = ~(u64)0; 3631 /* Init IA32_MCi_CTL to all 1s */ 3632 for (bank = 0; bank < bank_num; bank++) 3633 vcpu->arch.mce_banks[bank*4] = ~(u64)0; 3634 3635 kvm_x86_ops->setup_mce(vcpu); 3636 out: 3637 return r; 3638 } 3639 3640 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, 3641 struct kvm_x86_mce *mce) 3642 { 3643 u64 mcg_cap = vcpu->arch.mcg_cap; 3644 unsigned bank_num = mcg_cap & 0xff; 3645 u64 *banks = vcpu->arch.mce_banks; 3646 3647 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) 3648 return -EINVAL; 3649 /* 3650 * if IA32_MCG_CTL is not all 1s, the uncorrected error 3651 * reporting is disabled 3652 */ 3653 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && 3654 vcpu->arch.mcg_ctl != ~(u64)0) 3655 return 0; 3656 banks += 4 * mce->bank; 3657 /* 3658 * if IA32_MCi_CTL is not all 1s, the uncorrected error 3659 * reporting is disabled for the bank 3660 */ 3661 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) 3662 return 0; 3663 if (mce->status & MCI_STATUS_UC) { 3664 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || 3665 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { 3666 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 3667 return 0; 3668 } 3669 if (banks[1] & MCI_STATUS_VAL) 3670 mce->status |= MCI_STATUS_OVER; 3671 banks[2] = mce->addr; 3672 banks[3] = mce->misc; 3673 vcpu->arch.mcg_status = mce->mcg_status; 3674 banks[1] = mce->status; 3675 kvm_queue_exception(vcpu, MC_VECTOR); 3676 } else if (!(banks[1] & MCI_STATUS_VAL) 3677 || !(banks[1] & MCI_STATUS_UC)) { 3678 if (banks[1] & MCI_STATUS_VAL) 3679 mce->status |= MCI_STATUS_OVER; 3680 banks[2] = mce->addr; 3681 banks[3] = mce->misc; 3682 banks[1] = mce->status; 3683 } else 3684 banks[1] |= MCI_STATUS_OVER; 3685 return 0; 3686 } 3687 3688 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, 3689 struct kvm_vcpu_events *events) 3690 { 3691 process_nmi(vcpu); 3692 3693 /* 3694 * The API doesn't provide the instruction length for software 3695 * exceptions, so don't report them. As long as the guest RIP 3696 * isn't advanced, we should expect to encounter the exception 3697 * again. 3698 */ 3699 if (kvm_exception_is_soft(vcpu->arch.exception.nr)) { 3700 events->exception.injected = 0; 3701 events->exception.pending = 0; 3702 } else { 3703 events->exception.injected = vcpu->arch.exception.injected; 3704 events->exception.pending = vcpu->arch.exception.pending; 3705 /* 3706 * For ABI compatibility, deliberately conflate 3707 * pending and injected exceptions when 3708 * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled. 3709 */ 3710 if (!vcpu->kvm->arch.exception_payload_enabled) 3711 events->exception.injected |= 3712 vcpu->arch.exception.pending; 3713 } 3714 events->exception.nr = vcpu->arch.exception.nr; 3715 events->exception.has_error_code = vcpu->arch.exception.has_error_code; 3716 events->exception.error_code = vcpu->arch.exception.error_code; 3717 events->exception_has_payload = vcpu->arch.exception.has_payload; 3718 events->exception_payload = vcpu->arch.exception.payload; 3719 3720 events->interrupt.injected = 3721 vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft; 3722 events->interrupt.nr = vcpu->arch.interrupt.nr; 3723 events->interrupt.soft = 0; 3724 events->interrupt.shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 3725 3726 events->nmi.injected = vcpu->arch.nmi_injected; 3727 events->nmi.pending = vcpu->arch.nmi_pending != 0; 3728 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); 3729 events->nmi.pad = 0; 3730 3731 events->sipi_vector = 0; /* never valid when reporting to user space */ 3732 3733 events->smi.smm = is_smm(vcpu); 3734 events->smi.pending = vcpu->arch.smi_pending; 3735 events->smi.smm_inside_nmi = 3736 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK); 3737 events->smi.latched_init = kvm_lapic_latched_init(vcpu); 3738 3739 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING 3740 | KVM_VCPUEVENT_VALID_SHADOW 3741 | KVM_VCPUEVENT_VALID_SMM); 3742 if (vcpu->kvm->arch.exception_payload_enabled) 3743 events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD; 3744 3745 memset(&events->reserved, 0, sizeof(events->reserved)); 3746 } 3747 3748 static void kvm_smm_changed(struct kvm_vcpu *vcpu); 3749 3750 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, 3751 struct kvm_vcpu_events *events) 3752 { 3753 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING 3754 | KVM_VCPUEVENT_VALID_SIPI_VECTOR 3755 | KVM_VCPUEVENT_VALID_SHADOW 3756 | KVM_VCPUEVENT_VALID_SMM 3757 | KVM_VCPUEVENT_VALID_PAYLOAD)) 3758 return -EINVAL; 3759 3760 if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) { 3761 if (!vcpu->kvm->arch.exception_payload_enabled) 3762 return -EINVAL; 3763 if (events->exception.pending) 3764 events->exception.injected = 0; 3765 else 3766 events->exception_has_payload = 0; 3767 } else { 3768 events->exception.pending = 0; 3769 events->exception_has_payload = 0; 3770 } 3771 3772 if ((events->exception.injected || events->exception.pending) && 3773 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR)) 3774 return -EINVAL; 3775 3776 /* INITs are latched while in SMM */ 3777 if (events->flags & KVM_VCPUEVENT_VALID_SMM && 3778 (events->smi.smm || events->smi.pending) && 3779 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) 3780 return -EINVAL; 3781 3782 process_nmi(vcpu); 3783 vcpu->arch.exception.injected = events->exception.injected; 3784 vcpu->arch.exception.pending = events->exception.pending; 3785 vcpu->arch.exception.nr = events->exception.nr; 3786 vcpu->arch.exception.has_error_code = events->exception.has_error_code; 3787 vcpu->arch.exception.error_code = events->exception.error_code; 3788 vcpu->arch.exception.has_payload = events->exception_has_payload; 3789 vcpu->arch.exception.payload = events->exception_payload; 3790 3791 vcpu->arch.interrupt.injected = events->interrupt.injected; 3792 vcpu->arch.interrupt.nr = events->interrupt.nr; 3793 vcpu->arch.interrupt.soft = events->interrupt.soft; 3794 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) 3795 kvm_x86_ops->set_interrupt_shadow(vcpu, 3796 events->interrupt.shadow); 3797 3798 vcpu->arch.nmi_injected = events->nmi.injected; 3799 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) 3800 vcpu->arch.nmi_pending = events->nmi.pending; 3801 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); 3802 3803 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR && 3804 lapic_in_kernel(vcpu)) 3805 vcpu->arch.apic->sipi_vector = events->sipi_vector; 3806 3807 if (events->flags & KVM_VCPUEVENT_VALID_SMM) { 3808 if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm) { 3809 if (events->smi.smm) 3810 vcpu->arch.hflags |= HF_SMM_MASK; 3811 else 3812 vcpu->arch.hflags &= ~HF_SMM_MASK; 3813 kvm_smm_changed(vcpu); 3814 } 3815 3816 vcpu->arch.smi_pending = events->smi.pending; 3817 3818 if (events->smi.smm) { 3819 if (events->smi.smm_inside_nmi) 3820 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 3821 else 3822 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; 3823 if (lapic_in_kernel(vcpu)) { 3824 if (events->smi.latched_init) 3825 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3826 else 3827 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3828 } 3829 } 3830 } 3831 3832 kvm_make_request(KVM_REQ_EVENT, vcpu); 3833 3834 return 0; 3835 } 3836 3837 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, 3838 struct kvm_debugregs *dbgregs) 3839 { 3840 unsigned long val; 3841 3842 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); 3843 kvm_get_dr(vcpu, 6, &val); 3844 dbgregs->dr6 = val; 3845 dbgregs->dr7 = vcpu->arch.dr7; 3846 dbgregs->flags = 0; 3847 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); 3848 } 3849 3850 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, 3851 struct kvm_debugregs *dbgregs) 3852 { 3853 if (dbgregs->flags) 3854 return -EINVAL; 3855 3856 if (dbgregs->dr6 & ~0xffffffffull) 3857 return -EINVAL; 3858 if (dbgregs->dr7 & ~0xffffffffull) 3859 return -EINVAL; 3860 3861 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); 3862 kvm_update_dr0123(vcpu); 3863 vcpu->arch.dr6 = dbgregs->dr6; 3864 kvm_update_dr6(vcpu); 3865 vcpu->arch.dr7 = dbgregs->dr7; 3866 kvm_update_dr7(vcpu); 3867 3868 return 0; 3869 } 3870 3871 #define XSTATE_COMPACTION_ENABLED (1ULL << 63) 3872 3873 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) 3874 { 3875 struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; 3876 u64 xstate_bv = xsave->header.xfeatures; 3877 u64 valid; 3878 3879 /* 3880 * Copy legacy XSAVE area, to avoid complications with CPUID 3881 * leaves 0 and 1 in the loop below. 3882 */ 3883 memcpy(dest, xsave, XSAVE_HDR_OFFSET); 3884 3885 /* Set XSTATE_BV */ 3886 xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE; 3887 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv; 3888 3889 /* 3890 * Copy each region from the possibly compacted offset to the 3891 * non-compacted offset. 3892 */ 3893 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3894 while (valid) { 3895 u64 xfeature_mask = valid & -valid; 3896 int xfeature_nr = fls64(xfeature_mask) - 1; 3897 void *src = get_xsave_addr(xsave, xfeature_nr); 3898 3899 if (src) { 3900 u32 size, offset, ecx, edx; 3901 cpuid_count(XSTATE_CPUID, xfeature_nr, 3902 &size, &offset, &ecx, &edx); 3903 if (xfeature_nr == XFEATURE_PKRU) 3904 memcpy(dest + offset, &vcpu->arch.pkru, 3905 sizeof(vcpu->arch.pkru)); 3906 else 3907 memcpy(dest + offset, src, size); 3908 3909 } 3910 3911 valid -= xfeature_mask; 3912 } 3913 } 3914 3915 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src) 3916 { 3917 struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; 3918 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET); 3919 u64 valid; 3920 3921 /* 3922 * Copy legacy XSAVE area, to avoid complications with CPUID 3923 * leaves 0 and 1 in the loop below. 3924 */ 3925 memcpy(xsave, src, XSAVE_HDR_OFFSET); 3926 3927 /* Set XSTATE_BV and possibly XCOMP_BV. */ 3928 xsave->header.xfeatures = xstate_bv; 3929 if (boot_cpu_has(X86_FEATURE_XSAVES)) 3930 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED; 3931 3932 /* 3933 * Copy each region from the non-compacted offset to the 3934 * possibly compacted offset. 3935 */ 3936 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3937 while (valid) { 3938 u64 xfeature_mask = valid & -valid; 3939 int xfeature_nr = fls64(xfeature_mask) - 1; 3940 void *dest = get_xsave_addr(xsave, xfeature_nr); 3941 3942 if (dest) { 3943 u32 size, offset, ecx, edx; 3944 cpuid_count(XSTATE_CPUID, xfeature_nr, 3945 &size, &offset, &ecx, &edx); 3946 if (xfeature_nr == XFEATURE_PKRU) 3947 memcpy(&vcpu->arch.pkru, src + offset, 3948 sizeof(vcpu->arch.pkru)); 3949 else 3950 memcpy(dest, src + offset, size); 3951 } 3952 3953 valid -= xfeature_mask; 3954 } 3955 } 3956 3957 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, 3958 struct kvm_xsave *guest_xsave) 3959 { 3960 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3961 memset(guest_xsave, 0, sizeof(struct kvm_xsave)); 3962 fill_xsave((u8 *) guest_xsave->region, vcpu); 3963 } else { 3964 memcpy(guest_xsave->region, 3965 &vcpu->arch.guest_fpu->state.fxsave, 3966 sizeof(struct fxregs_state)); 3967 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = 3968 XFEATURE_MASK_FPSSE; 3969 } 3970 } 3971 3972 #define XSAVE_MXCSR_OFFSET 24 3973 3974 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, 3975 struct kvm_xsave *guest_xsave) 3976 { 3977 u64 xstate_bv = 3978 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; 3979 u32 mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)]; 3980 3981 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3982 /* 3983 * Here we allow setting states that are not present in 3984 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility 3985 * with old userspace. 3986 */ 3987 if (xstate_bv & ~kvm_supported_xcr0() || 3988 mxcsr & ~mxcsr_feature_mask) 3989 return -EINVAL; 3990 load_xsave(vcpu, (u8 *)guest_xsave->region); 3991 } else { 3992 if (xstate_bv & ~XFEATURE_MASK_FPSSE || 3993 mxcsr & ~mxcsr_feature_mask) 3994 return -EINVAL; 3995 memcpy(&vcpu->arch.guest_fpu->state.fxsave, 3996 guest_xsave->region, sizeof(struct fxregs_state)); 3997 } 3998 return 0; 3999 } 4000 4001 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, 4002 struct kvm_xcrs *guest_xcrs) 4003 { 4004 if (!boot_cpu_has(X86_FEATURE_XSAVE)) { 4005 guest_xcrs->nr_xcrs = 0; 4006 return; 4007 } 4008 4009 guest_xcrs->nr_xcrs = 1; 4010 guest_xcrs->flags = 0; 4011 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK; 4012 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0; 4013 } 4014 4015 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, 4016 struct kvm_xcrs *guest_xcrs) 4017 { 4018 int i, r = 0; 4019 4020 if (!boot_cpu_has(X86_FEATURE_XSAVE)) 4021 return -EINVAL; 4022 4023 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags) 4024 return -EINVAL; 4025 4026 for (i = 0; i < guest_xcrs->nr_xcrs; i++) 4027 /* Only support XCR0 currently */ 4028 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) { 4029 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK, 4030 guest_xcrs->xcrs[i].value); 4031 break; 4032 } 4033 if (r) 4034 r = -EINVAL; 4035 return r; 4036 } 4037 4038 /* 4039 * kvm_set_guest_paused() indicates to the guest kernel that it has been 4040 * stopped by the hypervisor. This function will be called from the host only. 4041 * EINVAL is returned when the host attempts to set the flag for a guest that 4042 * does not support pv clocks. 4043 */ 4044 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) 4045 { 4046 if (!vcpu->arch.pv_time_enabled) 4047 return -EINVAL; 4048 vcpu->arch.pvclock_set_guest_stopped_request = true; 4049 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 4050 return 0; 4051 } 4052 4053 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 4054 struct kvm_enable_cap *cap) 4055 { 4056 int r; 4057 uint16_t vmcs_version; 4058 void __user *user_ptr; 4059 4060 if (cap->flags) 4061 return -EINVAL; 4062 4063 switch (cap->cap) { 4064 case KVM_CAP_HYPERV_SYNIC2: 4065 if (cap->args[0]) 4066 return -EINVAL; 4067 /* fall through */ 4068 4069 case KVM_CAP_HYPERV_SYNIC: 4070 if (!irqchip_in_kernel(vcpu->kvm)) 4071 return -EINVAL; 4072 return kvm_hv_activate_synic(vcpu, cap->cap == 4073 KVM_CAP_HYPERV_SYNIC2); 4074 case KVM_CAP_HYPERV_ENLIGHTENED_VMCS: 4075 if (!kvm_x86_ops->nested_enable_evmcs) 4076 return -ENOTTY; 4077 r = kvm_x86_ops->nested_enable_evmcs(vcpu, &vmcs_version); 4078 if (!r) { 4079 user_ptr = (void __user *)(uintptr_t)cap->args[0]; 4080 if (copy_to_user(user_ptr, &vmcs_version, 4081 sizeof(vmcs_version))) 4082 r = -EFAULT; 4083 } 4084 return r; 4085 case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: 4086 if (!kvm_x86_ops->enable_direct_tlbflush) 4087 return -ENOTTY; 4088 4089 return kvm_x86_ops->enable_direct_tlbflush(vcpu); 4090 4091 default: 4092 return -EINVAL; 4093 } 4094 } 4095 4096 long kvm_arch_vcpu_ioctl(struct file *filp, 4097 unsigned int ioctl, unsigned long arg) 4098 { 4099 struct kvm_vcpu *vcpu = filp->private_data; 4100 void __user *argp = (void __user *)arg; 4101 int r; 4102 union { 4103 struct kvm_lapic_state *lapic; 4104 struct kvm_xsave *xsave; 4105 struct kvm_xcrs *xcrs; 4106 void *buffer; 4107 } u; 4108 4109 vcpu_load(vcpu); 4110 4111 u.buffer = NULL; 4112 switch (ioctl) { 4113 case KVM_GET_LAPIC: { 4114 r = -EINVAL; 4115 if (!lapic_in_kernel(vcpu)) 4116 goto out; 4117 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), 4118 GFP_KERNEL_ACCOUNT); 4119 4120 r = -ENOMEM; 4121 if (!u.lapic) 4122 goto out; 4123 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic); 4124 if (r) 4125 goto out; 4126 r = -EFAULT; 4127 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state))) 4128 goto out; 4129 r = 0; 4130 break; 4131 } 4132 case KVM_SET_LAPIC: { 4133 r = -EINVAL; 4134 if (!lapic_in_kernel(vcpu)) 4135 goto out; 4136 u.lapic = memdup_user(argp, sizeof(*u.lapic)); 4137 if (IS_ERR(u.lapic)) { 4138 r = PTR_ERR(u.lapic); 4139 goto out_nofree; 4140 } 4141 4142 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic); 4143 break; 4144 } 4145 case KVM_INTERRUPT: { 4146 struct kvm_interrupt irq; 4147 4148 r = -EFAULT; 4149 if (copy_from_user(&irq, argp, sizeof(irq))) 4150 goto out; 4151 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 4152 break; 4153 } 4154 case KVM_NMI: { 4155 r = kvm_vcpu_ioctl_nmi(vcpu); 4156 break; 4157 } 4158 case KVM_SMI: { 4159 r = kvm_vcpu_ioctl_smi(vcpu); 4160 break; 4161 } 4162 case KVM_SET_CPUID: { 4163 struct kvm_cpuid __user *cpuid_arg = argp; 4164 struct kvm_cpuid cpuid; 4165 4166 r = -EFAULT; 4167 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4168 goto out; 4169 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); 4170 break; 4171 } 4172 case KVM_SET_CPUID2: { 4173 struct kvm_cpuid2 __user *cpuid_arg = argp; 4174 struct kvm_cpuid2 cpuid; 4175 4176 r = -EFAULT; 4177 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4178 goto out; 4179 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, 4180 cpuid_arg->entries); 4181 break; 4182 } 4183 case KVM_GET_CPUID2: { 4184 struct kvm_cpuid2 __user *cpuid_arg = argp; 4185 struct kvm_cpuid2 cpuid; 4186 4187 r = -EFAULT; 4188 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4189 goto out; 4190 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, 4191 cpuid_arg->entries); 4192 if (r) 4193 goto out; 4194 r = -EFAULT; 4195 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 4196 goto out; 4197 r = 0; 4198 break; 4199 } 4200 case KVM_GET_MSRS: { 4201 int idx = srcu_read_lock(&vcpu->kvm->srcu); 4202 r = msr_io(vcpu, argp, do_get_msr, 1); 4203 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4204 break; 4205 } 4206 case KVM_SET_MSRS: { 4207 int idx = srcu_read_lock(&vcpu->kvm->srcu); 4208 r = msr_io(vcpu, argp, do_set_msr, 0); 4209 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4210 break; 4211 } 4212 case KVM_TPR_ACCESS_REPORTING: { 4213 struct kvm_tpr_access_ctl tac; 4214 4215 r = -EFAULT; 4216 if (copy_from_user(&tac, argp, sizeof(tac))) 4217 goto out; 4218 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); 4219 if (r) 4220 goto out; 4221 r = -EFAULT; 4222 if (copy_to_user(argp, &tac, sizeof(tac))) 4223 goto out; 4224 r = 0; 4225 break; 4226 }; 4227 case KVM_SET_VAPIC_ADDR: { 4228 struct kvm_vapic_addr va; 4229 int idx; 4230 4231 r = -EINVAL; 4232 if (!lapic_in_kernel(vcpu)) 4233 goto out; 4234 r = -EFAULT; 4235 if (copy_from_user(&va, argp, sizeof(va))) 4236 goto out; 4237 idx = srcu_read_lock(&vcpu->kvm->srcu); 4238 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); 4239 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4240 break; 4241 } 4242 case KVM_X86_SETUP_MCE: { 4243 u64 mcg_cap; 4244 4245 r = -EFAULT; 4246 if (copy_from_user(&mcg_cap, argp, sizeof(mcg_cap))) 4247 goto out; 4248 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); 4249 break; 4250 } 4251 case KVM_X86_SET_MCE: { 4252 struct kvm_x86_mce mce; 4253 4254 r = -EFAULT; 4255 if (copy_from_user(&mce, argp, sizeof(mce))) 4256 goto out; 4257 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); 4258 break; 4259 } 4260 case KVM_GET_VCPU_EVENTS: { 4261 struct kvm_vcpu_events events; 4262 4263 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); 4264 4265 r = -EFAULT; 4266 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) 4267 break; 4268 r = 0; 4269 break; 4270 } 4271 case KVM_SET_VCPU_EVENTS: { 4272 struct kvm_vcpu_events events; 4273 4274 r = -EFAULT; 4275 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) 4276 break; 4277 4278 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); 4279 break; 4280 } 4281 case KVM_GET_DEBUGREGS: { 4282 struct kvm_debugregs dbgregs; 4283 4284 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs); 4285 4286 r = -EFAULT; 4287 if (copy_to_user(argp, &dbgregs, 4288 sizeof(struct kvm_debugregs))) 4289 break; 4290 r = 0; 4291 break; 4292 } 4293 case KVM_SET_DEBUGREGS: { 4294 struct kvm_debugregs dbgregs; 4295 4296 r = -EFAULT; 4297 if (copy_from_user(&dbgregs, argp, 4298 sizeof(struct kvm_debugregs))) 4299 break; 4300 4301 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs); 4302 break; 4303 } 4304 case KVM_GET_XSAVE: { 4305 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL_ACCOUNT); 4306 r = -ENOMEM; 4307 if (!u.xsave) 4308 break; 4309 4310 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave); 4311 4312 r = -EFAULT; 4313 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave))) 4314 break; 4315 r = 0; 4316 break; 4317 } 4318 case KVM_SET_XSAVE: { 4319 u.xsave = memdup_user(argp, sizeof(*u.xsave)); 4320 if (IS_ERR(u.xsave)) { 4321 r = PTR_ERR(u.xsave); 4322 goto out_nofree; 4323 } 4324 4325 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave); 4326 break; 4327 } 4328 case KVM_GET_XCRS: { 4329 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL_ACCOUNT); 4330 r = -ENOMEM; 4331 if (!u.xcrs) 4332 break; 4333 4334 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs); 4335 4336 r = -EFAULT; 4337 if (copy_to_user(argp, u.xcrs, 4338 sizeof(struct kvm_xcrs))) 4339 break; 4340 r = 0; 4341 break; 4342 } 4343 case KVM_SET_XCRS: { 4344 u.xcrs = memdup_user(argp, sizeof(*u.xcrs)); 4345 if (IS_ERR(u.xcrs)) { 4346 r = PTR_ERR(u.xcrs); 4347 goto out_nofree; 4348 } 4349 4350 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs); 4351 break; 4352 } 4353 case KVM_SET_TSC_KHZ: { 4354 u32 user_tsc_khz; 4355 4356 r = -EINVAL; 4357 user_tsc_khz = (u32)arg; 4358 4359 if (user_tsc_khz >= kvm_max_guest_tsc_khz) 4360 goto out; 4361 4362 if (user_tsc_khz == 0) 4363 user_tsc_khz = tsc_khz; 4364 4365 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz)) 4366 r = 0; 4367 4368 goto out; 4369 } 4370 case KVM_GET_TSC_KHZ: { 4371 r = vcpu->arch.virtual_tsc_khz; 4372 goto out; 4373 } 4374 case KVM_KVMCLOCK_CTRL: { 4375 r = kvm_set_guest_paused(vcpu); 4376 goto out; 4377 } 4378 case KVM_ENABLE_CAP: { 4379 struct kvm_enable_cap cap; 4380 4381 r = -EFAULT; 4382 if (copy_from_user(&cap, argp, sizeof(cap))) 4383 goto out; 4384 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 4385 break; 4386 } 4387 case KVM_GET_NESTED_STATE: { 4388 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4389 u32 user_data_size; 4390 4391 r = -EINVAL; 4392 if (!kvm_x86_ops->get_nested_state) 4393 break; 4394 4395 BUILD_BUG_ON(sizeof(user_data_size) != sizeof(user_kvm_nested_state->size)); 4396 r = -EFAULT; 4397 if (get_user(user_data_size, &user_kvm_nested_state->size)) 4398 break; 4399 4400 r = kvm_x86_ops->get_nested_state(vcpu, user_kvm_nested_state, 4401 user_data_size); 4402 if (r < 0) 4403 break; 4404 4405 if (r > user_data_size) { 4406 if (put_user(r, &user_kvm_nested_state->size)) 4407 r = -EFAULT; 4408 else 4409 r = -E2BIG; 4410 break; 4411 } 4412 4413 r = 0; 4414 break; 4415 } 4416 case KVM_SET_NESTED_STATE: { 4417 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4418 struct kvm_nested_state kvm_state; 4419 4420 r = -EINVAL; 4421 if (!kvm_x86_ops->set_nested_state) 4422 break; 4423 4424 r = -EFAULT; 4425 if (copy_from_user(&kvm_state, user_kvm_nested_state, sizeof(kvm_state))) 4426 break; 4427 4428 r = -EINVAL; 4429 if (kvm_state.size < sizeof(kvm_state)) 4430 break; 4431 4432 if (kvm_state.flags & 4433 ~(KVM_STATE_NESTED_RUN_PENDING | KVM_STATE_NESTED_GUEST_MODE 4434 | KVM_STATE_NESTED_EVMCS)) 4435 break; 4436 4437 /* nested_run_pending implies guest_mode. */ 4438 if ((kvm_state.flags & KVM_STATE_NESTED_RUN_PENDING) 4439 && !(kvm_state.flags & KVM_STATE_NESTED_GUEST_MODE)) 4440 break; 4441 4442 r = kvm_x86_ops->set_nested_state(vcpu, user_kvm_nested_state, &kvm_state); 4443 break; 4444 } 4445 case KVM_GET_SUPPORTED_HV_CPUID: { 4446 struct kvm_cpuid2 __user *cpuid_arg = argp; 4447 struct kvm_cpuid2 cpuid; 4448 4449 r = -EFAULT; 4450 if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) 4451 goto out; 4452 4453 r = kvm_vcpu_ioctl_get_hv_cpuid(vcpu, &cpuid, 4454 cpuid_arg->entries); 4455 if (r) 4456 goto out; 4457 4458 r = -EFAULT; 4459 if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) 4460 goto out; 4461 r = 0; 4462 break; 4463 } 4464 default: 4465 r = -EINVAL; 4466 } 4467 out: 4468 kfree(u.buffer); 4469 out_nofree: 4470 vcpu_put(vcpu); 4471 return r; 4472 } 4473 4474 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 4475 { 4476 return VM_FAULT_SIGBUS; 4477 } 4478 4479 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) 4480 { 4481 int ret; 4482 4483 if (addr > (unsigned int)(-3 * PAGE_SIZE)) 4484 return -EINVAL; 4485 ret = kvm_x86_ops->set_tss_addr(kvm, addr); 4486 return ret; 4487 } 4488 4489 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, 4490 u64 ident_addr) 4491 { 4492 return kvm_x86_ops->set_identity_map_addr(kvm, ident_addr); 4493 } 4494 4495 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, 4496 unsigned long kvm_nr_mmu_pages) 4497 { 4498 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) 4499 return -EINVAL; 4500 4501 mutex_lock(&kvm->slots_lock); 4502 4503 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); 4504 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; 4505 4506 mutex_unlock(&kvm->slots_lock); 4507 return 0; 4508 } 4509 4510 static unsigned long kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) 4511 { 4512 return kvm->arch.n_max_mmu_pages; 4513 } 4514 4515 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 4516 { 4517 struct kvm_pic *pic = kvm->arch.vpic; 4518 int r; 4519 4520 r = 0; 4521 switch (chip->chip_id) { 4522 case KVM_IRQCHIP_PIC_MASTER: 4523 memcpy(&chip->chip.pic, &pic->pics[0], 4524 sizeof(struct kvm_pic_state)); 4525 break; 4526 case KVM_IRQCHIP_PIC_SLAVE: 4527 memcpy(&chip->chip.pic, &pic->pics[1], 4528 sizeof(struct kvm_pic_state)); 4529 break; 4530 case KVM_IRQCHIP_IOAPIC: 4531 kvm_get_ioapic(kvm, &chip->chip.ioapic); 4532 break; 4533 default: 4534 r = -EINVAL; 4535 break; 4536 } 4537 return r; 4538 } 4539 4540 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 4541 { 4542 struct kvm_pic *pic = kvm->arch.vpic; 4543 int r; 4544 4545 r = 0; 4546 switch (chip->chip_id) { 4547 case KVM_IRQCHIP_PIC_MASTER: 4548 spin_lock(&pic->lock); 4549 memcpy(&pic->pics[0], &chip->chip.pic, 4550 sizeof(struct kvm_pic_state)); 4551 spin_unlock(&pic->lock); 4552 break; 4553 case KVM_IRQCHIP_PIC_SLAVE: 4554 spin_lock(&pic->lock); 4555 memcpy(&pic->pics[1], &chip->chip.pic, 4556 sizeof(struct kvm_pic_state)); 4557 spin_unlock(&pic->lock); 4558 break; 4559 case KVM_IRQCHIP_IOAPIC: 4560 kvm_set_ioapic(kvm, &chip->chip.ioapic); 4561 break; 4562 default: 4563 r = -EINVAL; 4564 break; 4565 } 4566 kvm_pic_update_irq(pic); 4567 return r; 4568 } 4569 4570 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) 4571 { 4572 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state; 4573 4574 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels)); 4575 4576 mutex_lock(&kps->lock); 4577 memcpy(ps, &kps->channels, sizeof(*ps)); 4578 mutex_unlock(&kps->lock); 4579 return 0; 4580 } 4581 4582 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) 4583 { 4584 int i; 4585 struct kvm_pit *pit = kvm->arch.vpit; 4586 4587 mutex_lock(&pit->pit_state.lock); 4588 memcpy(&pit->pit_state.channels, ps, sizeof(*ps)); 4589 for (i = 0; i < 3; i++) 4590 kvm_pit_load_count(pit, i, ps->channels[i].count, 0); 4591 mutex_unlock(&pit->pit_state.lock); 4592 return 0; 4593 } 4594 4595 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 4596 { 4597 mutex_lock(&kvm->arch.vpit->pit_state.lock); 4598 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, 4599 sizeof(ps->channels)); 4600 ps->flags = kvm->arch.vpit->pit_state.flags; 4601 mutex_unlock(&kvm->arch.vpit->pit_state.lock); 4602 memset(&ps->reserved, 0, sizeof(ps->reserved)); 4603 return 0; 4604 } 4605 4606 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 4607 { 4608 int start = 0; 4609 int i; 4610 u32 prev_legacy, cur_legacy; 4611 struct kvm_pit *pit = kvm->arch.vpit; 4612 4613 mutex_lock(&pit->pit_state.lock); 4614 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; 4615 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; 4616 if (!prev_legacy && cur_legacy) 4617 start = 1; 4618 memcpy(&pit->pit_state.channels, &ps->channels, 4619 sizeof(pit->pit_state.channels)); 4620 pit->pit_state.flags = ps->flags; 4621 for (i = 0; i < 3; i++) 4622 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, 4623 start && i == 0); 4624 mutex_unlock(&pit->pit_state.lock); 4625 return 0; 4626 } 4627 4628 static int kvm_vm_ioctl_reinject(struct kvm *kvm, 4629 struct kvm_reinject_control *control) 4630 { 4631 struct kvm_pit *pit = kvm->arch.vpit; 4632 4633 if (!pit) 4634 return -ENXIO; 4635 4636 /* pit->pit_state.lock was overloaded to prevent userspace from getting 4637 * an inconsistent state after running multiple KVM_REINJECT_CONTROL 4638 * ioctls in parallel. Use a separate lock if that ioctl isn't rare. 4639 */ 4640 mutex_lock(&pit->pit_state.lock); 4641 kvm_pit_set_reinject(pit, control->pit_reinject); 4642 mutex_unlock(&pit->pit_state.lock); 4643 4644 return 0; 4645 } 4646 4647 /** 4648 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot 4649 * @kvm: kvm instance 4650 * @log: slot id and address to which we copy the log 4651 * 4652 * Steps 1-4 below provide general overview of dirty page logging. See 4653 * kvm_get_dirty_log_protect() function description for additional details. 4654 * 4655 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we 4656 * always flush the TLB (step 4) even if previous step failed and the dirty 4657 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API 4658 * does not preclude user space subsequent dirty log read. Flushing TLB ensures 4659 * writes will be marked dirty for next log read. 4660 * 4661 * 1. Take a snapshot of the bit and clear it if needed. 4662 * 2. Write protect the corresponding page. 4663 * 3. Copy the snapshot to the userspace. 4664 * 4. Flush TLB's if needed. 4665 */ 4666 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 4667 { 4668 bool flush = false; 4669 int r; 4670 4671 mutex_lock(&kvm->slots_lock); 4672 4673 /* 4674 * Flush potentially hardware-cached dirty pages to dirty_bitmap. 4675 */ 4676 if (kvm_x86_ops->flush_log_dirty) 4677 kvm_x86_ops->flush_log_dirty(kvm); 4678 4679 r = kvm_get_dirty_log_protect(kvm, log, &flush); 4680 4681 /* 4682 * All the TLBs can be flushed out of mmu lock, see the comments in 4683 * kvm_mmu_slot_remove_write_access(). 4684 */ 4685 lockdep_assert_held(&kvm->slots_lock); 4686 if (flush) 4687 kvm_flush_remote_tlbs(kvm); 4688 4689 mutex_unlock(&kvm->slots_lock); 4690 return r; 4691 } 4692 4693 int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *log) 4694 { 4695 bool flush = false; 4696 int r; 4697 4698 mutex_lock(&kvm->slots_lock); 4699 4700 /* 4701 * Flush potentially hardware-cached dirty pages to dirty_bitmap. 4702 */ 4703 if (kvm_x86_ops->flush_log_dirty) 4704 kvm_x86_ops->flush_log_dirty(kvm); 4705 4706 r = kvm_clear_dirty_log_protect(kvm, log, &flush); 4707 4708 /* 4709 * All the TLBs can be flushed out of mmu lock, see the comments in 4710 * kvm_mmu_slot_remove_write_access(). 4711 */ 4712 lockdep_assert_held(&kvm->slots_lock); 4713 if (flush) 4714 kvm_flush_remote_tlbs(kvm); 4715 4716 mutex_unlock(&kvm->slots_lock); 4717 return r; 4718 } 4719 4720 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, 4721 bool line_status) 4722 { 4723 if (!irqchip_in_kernel(kvm)) 4724 return -ENXIO; 4725 4726 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 4727 irq_event->irq, irq_event->level, 4728 line_status); 4729 return 0; 4730 } 4731 4732 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 4733 struct kvm_enable_cap *cap) 4734 { 4735 int r; 4736 4737 if (cap->flags) 4738 return -EINVAL; 4739 4740 switch (cap->cap) { 4741 case KVM_CAP_DISABLE_QUIRKS: 4742 kvm->arch.disabled_quirks = cap->args[0]; 4743 r = 0; 4744 break; 4745 case KVM_CAP_SPLIT_IRQCHIP: { 4746 mutex_lock(&kvm->lock); 4747 r = -EINVAL; 4748 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS) 4749 goto split_irqchip_unlock; 4750 r = -EEXIST; 4751 if (irqchip_in_kernel(kvm)) 4752 goto split_irqchip_unlock; 4753 if (kvm->created_vcpus) 4754 goto split_irqchip_unlock; 4755 r = kvm_setup_empty_irq_routing(kvm); 4756 if (r) 4757 goto split_irqchip_unlock; 4758 /* Pairs with irqchip_in_kernel. */ 4759 smp_wmb(); 4760 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT; 4761 kvm->arch.nr_reserved_ioapic_pins = cap->args[0]; 4762 r = 0; 4763 split_irqchip_unlock: 4764 mutex_unlock(&kvm->lock); 4765 break; 4766 } 4767 case KVM_CAP_X2APIC_API: 4768 r = -EINVAL; 4769 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS) 4770 break; 4771 4772 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS) 4773 kvm->arch.x2apic_format = true; 4774 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 4775 kvm->arch.x2apic_broadcast_quirk_disabled = true; 4776 4777 r = 0; 4778 break; 4779 case KVM_CAP_X86_DISABLE_EXITS: 4780 r = -EINVAL; 4781 if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS) 4782 break; 4783 4784 if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) && 4785 kvm_can_mwait_in_guest()) 4786 kvm->arch.mwait_in_guest = true; 4787 if (cap->args[0] & KVM_X86_DISABLE_EXITS_HLT) 4788 kvm->arch.hlt_in_guest = true; 4789 if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE) 4790 kvm->arch.pause_in_guest = true; 4791 if (cap->args[0] & KVM_X86_DISABLE_EXITS_CSTATE) 4792 kvm->arch.cstate_in_guest = true; 4793 r = 0; 4794 break; 4795 case KVM_CAP_MSR_PLATFORM_INFO: 4796 kvm->arch.guest_can_read_msr_platform_info = cap->args[0]; 4797 r = 0; 4798 break; 4799 case KVM_CAP_EXCEPTION_PAYLOAD: 4800 kvm->arch.exception_payload_enabled = cap->args[0]; 4801 r = 0; 4802 break; 4803 default: 4804 r = -EINVAL; 4805 break; 4806 } 4807 return r; 4808 } 4809 4810 long kvm_arch_vm_ioctl(struct file *filp, 4811 unsigned int ioctl, unsigned long arg) 4812 { 4813 struct kvm *kvm = filp->private_data; 4814 void __user *argp = (void __user *)arg; 4815 int r = -ENOTTY; 4816 /* 4817 * This union makes it completely explicit to gcc-3.x 4818 * that these two variables' stack usage should be 4819 * combined, not added together. 4820 */ 4821 union { 4822 struct kvm_pit_state ps; 4823 struct kvm_pit_state2 ps2; 4824 struct kvm_pit_config pit_config; 4825 } u; 4826 4827 switch (ioctl) { 4828 case KVM_SET_TSS_ADDR: 4829 r = kvm_vm_ioctl_set_tss_addr(kvm, arg); 4830 break; 4831 case KVM_SET_IDENTITY_MAP_ADDR: { 4832 u64 ident_addr; 4833 4834 mutex_lock(&kvm->lock); 4835 r = -EINVAL; 4836 if (kvm->created_vcpus) 4837 goto set_identity_unlock; 4838 r = -EFAULT; 4839 if (copy_from_user(&ident_addr, argp, sizeof(ident_addr))) 4840 goto set_identity_unlock; 4841 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); 4842 set_identity_unlock: 4843 mutex_unlock(&kvm->lock); 4844 break; 4845 } 4846 case KVM_SET_NR_MMU_PAGES: 4847 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); 4848 break; 4849 case KVM_GET_NR_MMU_PAGES: 4850 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); 4851 break; 4852 case KVM_CREATE_IRQCHIP: { 4853 mutex_lock(&kvm->lock); 4854 4855 r = -EEXIST; 4856 if (irqchip_in_kernel(kvm)) 4857 goto create_irqchip_unlock; 4858 4859 r = -EINVAL; 4860 if (kvm->created_vcpus) 4861 goto create_irqchip_unlock; 4862 4863 r = kvm_pic_init(kvm); 4864 if (r) 4865 goto create_irqchip_unlock; 4866 4867 r = kvm_ioapic_init(kvm); 4868 if (r) { 4869 kvm_pic_destroy(kvm); 4870 goto create_irqchip_unlock; 4871 } 4872 4873 r = kvm_setup_default_irq_routing(kvm); 4874 if (r) { 4875 kvm_ioapic_destroy(kvm); 4876 kvm_pic_destroy(kvm); 4877 goto create_irqchip_unlock; 4878 } 4879 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */ 4880 smp_wmb(); 4881 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL; 4882 create_irqchip_unlock: 4883 mutex_unlock(&kvm->lock); 4884 break; 4885 } 4886 case KVM_CREATE_PIT: 4887 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; 4888 goto create_pit; 4889 case KVM_CREATE_PIT2: 4890 r = -EFAULT; 4891 if (copy_from_user(&u.pit_config, argp, 4892 sizeof(struct kvm_pit_config))) 4893 goto out; 4894 create_pit: 4895 mutex_lock(&kvm->lock); 4896 r = -EEXIST; 4897 if (kvm->arch.vpit) 4898 goto create_pit_unlock; 4899 r = -ENOMEM; 4900 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); 4901 if (kvm->arch.vpit) 4902 r = 0; 4903 create_pit_unlock: 4904 mutex_unlock(&kvm->lock); 4905 break; 4906 case KVM_GET_IRQCHIP: { 4907 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4908 struct kvm_irqchip *chip; 4909 4910 chip = memdup_user(argp, sizeof(*chip)); 4911 if (IS_ERR(chip)) { 4912 r = PTR_ERR(chip); 4913 goto out; 4914 } 4915 4916 r = -ENXIO; 4917 if (!irqchip_kernel(kvm)) 4918 goto get_irqchip_out; 4919 r = kvm_vm_ioctl_get_irqchip(kvm, chip); 4920 if (r) 4921 goto get_irqchip_out; 4922 r = -EFAULT; 4923 if (copy_to_user(argp, chip, sizeof(*chip))) 4924 goto get_irqchip_out; 4925 r = 0; 4926 get_irqchip_out: 4927 kfree(chip); 4928 break; 4929 } 4930 case KVM_SET_IRQCHIP: { 4931 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4932 struct kvm_irqchip *chip; 4933 4934 chip = memdup_user(argp, sizeof(*chip)); 4935 if (IS_ERR(chip)) { 4936 r = PTR_ERR(chip); 4937 goto out; 4938 } 4939 4940 r = -ENXIO; 4941 if (!irqchip_kernel(kvm)) 4942 goto set_irqchip_out; 4943 r = kvm_vm_ioctl_set_irqchip(kvm, chip); 4944 if (r) 4945 goto set_irqchip_out; 4946 r = 0; 4947 set_irqchip_out: 4948 kfree(chip); 4949 break; 4950 } 4951 case KVM_GET_PIT: { 4952 r = -EFAULT; 4953 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) 4954 goto out; 4955 r = -ENXIO; 4956 if (!kvm->arch.vpit) 4957 goto out; 4958 r = kvm_vm_ioctl_get_pit(kvm, &u.ps); 4959 if (r) 4960 goto out; 4961 r = -EFAULT; 4962 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) 4963 goto out; 4964 r = 0; 4965 break; 4966 } 4967 case KVM_SET_PIT: { 4968 r = -EFAULT; 4969 if (copy_from_user(&u.ps, argp, sizeof(u.ps))) 4970 goto out; 4971 r = -ENXIO; 4972 if (!kvm->arch.vpit) 4973 goto out; 4974 r = kvm_vm_ioctl_set_pit(kvm, &u.ps); 4975 break; 4976 } 4977 case KVM_GET_PIT2: { 4978 r = -ENXIO; 4979 if (!kvm->arch.vpit) 4980 goto out; 4981 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); 4982 if (r) 4983 goto out; 4984 r = -EFAULT; 4985 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) 4986 goto out; 4987 r = 0; 4988 break; 4989 } 4990 case KVM_SET_PIT2: { 4991 r = -EFAULT; 4992 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) 4993 goto out; 4994 r = -ENXIO; 4995 if (!kvm->arch.vpit) 4996 goto out; 4997 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); 4998 break; 4999 } 5000 case KVM_REINJECT_CONTROL: { 5001 struct kvm_reinject_control control; 5002 r = -EFAULT; 5003 if (copy_from_user(&control, argp, sizeof(control))) 5004 goto out; 5005 r = kvm_vm_ioctl_reinject(kvm, &control); 5006 break; 5007 } 5008 case KVM_SET_BOOT_CPU_ID: 5009 r = 0; 5010 mutex_lock(&kvm->lock); 5011 if (kvm->created_vcpus) 5012 r = -EBUSY; 5013 else 5014 kvm->arch.bsp_vcpu_id = arg; 5015 mutex_unlock(&kvm->lock); 5016 break; 5017 case KVM_XEN_HVM_CONFIG: { 5018 struct kvm_xen_hvm_config xhc; 5019 r = -EFAULT; 5020 if (copy_from_user(&xhc, argp, sizeof(xhc))) 5021 goto out; 5022 r = -EINVAL; 5023 if (xhc.flags) 5024 goto out; 5025 memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc)); 5026 r = 0; 5027 break; 5028 } 5029 case KVM_SET_CLOCK: { 5030 struct kvm_clock_data user_ns; 5031 u64 now_ns; 5032 5033 r = -EFAULT; 5034 if (copy_from_user(&user_ns, argp, sizeof(user_ns))) 5035 goto out; 5036 5037 r = -EINVAL; 5038 if (user_ns.flags) 5039 goto out; 5040 5041 r = 0; 5042 /* 5043 * TODO: userspace has to take care of races with VCPU_RUN, so 5044 * kvm_gen_update_masterclock() can be cut down to locked 5045 * pvclock_update_vm_gtod_copy(). 5046 */ 5047 kvm_gen_update_masterclock(kvm); 5048 now_ns = get_kvmclock_ns(kvm); 5049 kvm->arch.kvmclock_offset += user_ns.clock - now_ns; 5050 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE); 5051 break; 5052 } 5053 case KVM_GET_CLOCK: { 5054 struct kvm_clock_data user_ns; 5055 u64 now_ns; 5056 5057 now_ns = get_kvmclock_ns(kvm); 5058 user_ns.clock = now_ns; 5059 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0; 5060 memset(&user_ns.pad, 0, sizeof(user_ns.pad)); 5061 5062 r = -EFAULT; 5063 if (copy_to_user(argp, &user_ns, sizeof(user_ns))) 5064 goto out; 5065 r = 0; 5066 break; 5067 } 5068 case KVM_MEMORY_ENCRYPT_OP: { 5069 r = -ENOTTY; 5070 if (kvm_x86_ops->mem_enc_op) 5071 r = kvm_x86_ops->mem_enc_op(kvm, argp); 5072 break; 5073 } 5074 case KVM_MEMORY_ENCRYPT_REG_REGION: { 5075 struct kvm_enc_region region; 5076 5077 r = -EFAULT; 5078 if (copy_from_user(®ion, argp, sizeof(region))) 5079 goto out; 5080 5081 r = -ENOTTY; 5082 if (kvm_x86_ops->mem_enc_reg_region) 5083 r = kvm_x86_ops->mem_enc_reg_region(kvm, ®ion); 5084 break; 5085 } 5086 case KVM_MEMORY_ENCRYPT_UNREG_REGION: { 5087 struct kvm_enc_region region; 5088 5089 r = -EFAULT; 5090 if (copy_from_user(®ion, argp, sizeof(region))) 5091 goto out; 5092 5093 r = -ENOTTY; 5094 if (kvm_x86_ops->mem_enc_unreg_region) 5095 r = kvm_x86_ops->mem_enc_unreg_region(kvm, ®ion); 5096 break; 5097 } 5098 case KVM_HYPERV_EVENTFD: { 5099 struct kvm_hyperv_eventfd hvevfd; 5100 5101 r = -EFAULT; 5102 if (copy_from_user(&hvevfd, argp, sizeof(hvevfd))) 5103 goto out; 5104 r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd); 5105 break; 5106 } 5107 case KVM_SET_PMU_EVENT_FILTER: 5108 r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp); 5109 break; 5110 default: 5111 r = -ENOTTY; 5112 } 5113 out: 5114 return r; 5115 } 5116 5117 static void kvm_init_msr_list(void) 5118 { 5119 struct x86_pmu_capability x86_pmu; 5120 u32 dummy[2]; 5121 unsigned i, j; 5122 5123 BUILD_BUG_ON_MSG(INTEL_PMC_MAX_FIXED != 4, 5124 "Please update the fixed PMCs in msrs_to_save[]"); 5125 5126 perf_get_x86_pmu_capability(&x86_pmu); 5127 5128 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { 5129 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) 5130 continue; 5131 5132 /* 5133 * Even MSRs that are valid in the host may not be exposed 5134 * to the guests in some cases. 5135 */ 5136 switch (msrs_to_save[i]) { 5137 case MSR_IA32_BNDCFGS: 5138 if (!kvm_mpx_supported()) 5139 continue; 5140 break; 5141 case MSR_TSC_AUX: 5142 if (!kvm_x86_ops->rdtscp_supported()) 5143 continue; 5144 break; 5145 case MSR_IA32_RTIT_CTL: 5146 case MSR_IA32_RTIT_STATUS: 5147 if (!kvm_x86_ops->pt_supported()) 5148 continue; 5149 break; 5150 case MSR_IA32_RTIT_CR3_MATCH: 5151 if (!kvm_x86_ops->pt_supported() || 5152 !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering)) 5153 continue; 5154 break; 5155 case MSR_IA32_RTIT_OUTPUT_BASE: 5156 case MSR_IA32_RTIT_OUTPUT_MASK: 5157 if (!kvm_x86_ops->pt_supported() || 5158 (!intel_pt_validate_hw_cap(PT_CAP_topa_output) && 5159 !intel_pt_validate_hw_cap(PT_CAP_single_range_output))) 5160 continue; 5161 break; 5162 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: { 5163 if (!kvm_x86_ops->pt_supported() || 5164 msrs_to_save[i] - MSR_IA32_RTIT_ADDR0_A >= 5165 intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2) 5166 continue; 5167 break; 5168 case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR0 + 17: 5169 if (msrs_to_save[i] - MSR_ARCH_PERFMON_PERFCTR0 >= 5170 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 5171 continue; 5172 break; 5173 case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL0 + 17: 5174 if (msrs_to_save[i] - MSR_ARCH_PERFMON_EVENTSEL0 >= 5175 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 5176 continue; 5177 } 5178 default: 5179 break; 5180 } 5181 5182 if (j < i) 5183 msrs_to_save[j] = msrs_to_save[i]; 5184 j++; 5185 } 5186 num_msrs_to_save = j; 5187 5188 for (i = j = 0; i < ARRAY_SIZE(emulated_msrs); i++) { 5189 if (!kvm_x86_ops->has_emulated_msr(emulated_msrs[i])) 5190 continue; 5191 5192 if (j < i) 5193 emulated_msrs[j] = emulated_msrs[i]; 5194 j++; 5195 } 5196 num_emulated_msrs = j; 5197 5198 for (i = j = 0; i < ARRAY_SIZE(msr_based_features); i++) { 5199 struct kvm_msr_entry msr; 5200 5201 msr.index = msr_based_features[i]; 5202 if (kvm_get_msr_feature(&msr)) 5203 continue; 5204 5205 if (j < i) 5206 msr_based_features[j] = msr_based_features[i]; 5207 j++; 5208 } 5209 num_msr_based_features = j; 5210 } 5211 5212 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, 5213 const void *v) 5214 { 5215 int handled = 0; 5216 int n; 5217 5218 do { 5219 n = min(len, 8); 5220 if (!(lapic_in_kernel(vcpu) && 5221 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v)) 5222 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v)) 5223 break; 5224 handled += n; 5225 addr += n; 5226 len -= n; 5227 v += n; 5228 } while (len); 5229 5230 return handled; 5231 } 5232 5233 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) 5234 { 5235 int handled = 0; 5236 int n; 5237 5238 do { 5239 n = min(len, 8); 5240 if (!(lapic_in_kernel(vcpu) && 5241 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev, 5242 addr, n, v)) 5243 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v)) 5244 break; 5245 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v); 5246 handled += n; 5247 addr += n; 5248 len -= n; 5249 v += n; 5250 } while (len); 5251 5252 return handled; 5253 } 5254 5255 static void kvm_set_segment(struct kvm_vcpu *vcpu, 5256 struct kvm_segment *var, int seg) 5257 { 5258 kvm_x86_ops->set_segment(vcpu, var, seg); 5259 } 5260 5261 void kvm_get_segment(struct kvm_vcpu *vcpu, 5262 struct kvm_segment *var, int seg) 5263 { 5264 kvm_x86_ops->get_segment(vcpu, var, seg); 5265 } 5266 5267 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access, 5268 struct x86_exception *exception) 5269 { 5270 gpa_t t_gpa; 5271 5272 BUG_ON(!mmu_is_nested(vcpu)); 5273 5274 /* NPT walks are always user-walks */ 5275 access |= PFERR_USER_MASK; 5276 t_gpa = vcpu->arch.mmu->gva_to_gpa(vcpu, gpa, access, exception); 5277 5278 return t_gpa; 5279 } 5280 5281 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, 5282 struct x86_exception *exception) 5283 { 5284 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 5285 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5286 } 5287 5288 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, 5289 struct x86_exception *exception) 5290 { 5291 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 5292 access |= PFERR_FETCH_MASK; 5293 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5294 } 5295 5296 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, 5297 struct x86_exception *exception) 5298 { 5299 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 5300 access |= PFERR_WRITE_MASK; 5301 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5302 } 5303 5304 /* uses this to access any guest's mapped memory without checking CPL */ 5305 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, 5306 struct x86_exception *exception) 5307 { 5308 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception); 5309 } 5310 5311 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 5312 struct kvm_vcpu *vcpu, u32 access, 5313 struct x86_exception *exception) 5314 { 5315 void *data = val; 5316 int r = X86EMUL_CONTINUE; 5317 5318 while (bytes) { 5319 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access, 5320 exception); 5321 unsigned offset = addr & (PAGE_SIZE-1); 5322 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); 5323 int ret; 5324 5325 if (gpa == UNMAPPED_GVA) 5326 return X86EMUL_PROPAGATE_FAULT; 5327 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data, 5328 offset, toread); 5329 if (ret < 0) { 5330 r = X86EMUL_IO_NEEDED; 5331 goto out; 5332 } 5333 5334 bytes -= toread; 5335 data += toread; 5336 addr += toread; 5337 } 5338 out: 5339 return r; 5340 } 5341 5342 /* used for instruction fetching */ 5343 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, 5344 gva_t addr, void *val, unsigned int bytes, 5345 struct x86_exception *exception) 5346 { 5347 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5348 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 5349 unsigned offset; 5350 int ret; 5351 5352 /* Inline kvm_read_guest_virt_helper for speed. */ 5353 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK, 5354 exception); 5355 if (unlikely(gpa == UNMAPPED_GVA)) 5356 return X86EMUL_PROPAGATE_FAULT; 5357 5358 offset = addr & (PAGE_SIZE-1); 5359 if (WARN_ON(offset + bytes > PAGE_SIZE)) 5360 bytes = (unsigned)PAGE_SIZE - offset; 5361 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val, 5362 offset, bytes); 5363 if (unlikely(ret < 0)) 5364 return X86EMUL_IO_NEEDED; 5365 5366 return X86EMUL_CONTINUE; 5367 } 5368 5369 int kvm_read_guest_virt(struct kvm_vcpu *vcpu, 5370 gva_t addr, void *val, unsigned int bytes, 5371 struct x86_exception *exception) 5372 { 5373 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 5374 5375 /* 5376 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED 5377 * is returned, but our callers are not ready for that and they blindly 5378 * call kvm_inject_page_fault. Ensure that they at least do not leak 5379 * uninitialized kernel stack memory into cr2 and error code. 5380 */ 5381 memset(exception, 0, sizeof(*exception)); 5382 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, 5383 exception); 5384 } 5385 EXPORT_SYMBOL_GPL(kvm_read_guest_virt); 5386 5387 static int emulator_read_std(struct x86_emulate_ctxt *ctxt, 5388 gva_t addr, void *val, unsigned int bytes, 5389 struct x86_exception *exception, bool system) 5390 { 5391 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5392 u32 access = 0; 5393 5394 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3) 5395 access |= PFERR_USER_MASK; 5396 5397 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception); 5398 } 5399 5400 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, 5401 unsigned long addr, void *val, unsigned int bytes) 5402 { 5403 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5404 int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); 5405 5406 return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; 5407 } 5408 5409 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 5410 struct kvm_vcpu *vcpu, u32 access, 5411 struct x86_exception *exception) 5412 { 5413 void *data = val; 5414 int r = X86EMUL_CONTINUE; 5415 5416 while (bytes) { 5417 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, 5418 access, 5419 exception); 5420 unsigned offset = addr & (PAGE_SIZE-1); 5421 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); 5422 int ret; 5423 5424 if (gpa == UNMAPPED_GVA) 5425 return X86EMUL_PROPAGATE_FAULT; 5426 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); 5427 if (ret < 0) { 5428 r = X86EMUL_IO_NEEDED; 5429 goto out; 5430 } 5431 5432 bytes -= towrite; 5433 data += towrite; 5434 addr += towrite; 5435 } 5436 out: 5437 return r; 5438 } 5439 5440 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, 5441 unsigned int bytes, struct x86_exception *exception, 5442 bool system) 5443 { 5444 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5445 u32 access = PFERR_WRITE_MASK; 5446 5447 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3) 5448 access |= PFERR_USER_MASK; 5449 5450 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 5451 access, exception); 5452 } 5453 5454 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val, 5455 unsigned int bytes, struct x86_exception *exception) 5456 { 5457 /* kvm_write_guest_virt_system can pull in tons of pages. */ 5458 vcpu->arch.l1tf_flush_l1d = true; 5459 5460 /* 5461 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED 5462 * is returned, but our callers are not ready for that and they blindly 5463 * call kvm_inject_page_fault. Ensure that they at least do not leak 5464 * uninitialized kernel stack memory into cr2 and error code. 5465 */ 5466 memset(exception, 0, sizeof(*exception)); 5467 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 5468 PFERR_WRITE_MASK, exception); 5469 } 5470 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); 5471 5472 int handle_ud(struct kvm_vcpu *vcpu) 5473 { 5474 int emul_type = EMULTYPE_TRAP_UD; 5475 char sig[5]; /* ud2; .ascii "kvm" */ 5476 struct x86_exception e; 5477 5478 if (force_emulation_prefix && 5479 kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu), 5480 sig, sizeof(sig), &e) == 0 && 5481 memcmp(sig, "\xf\xbkvm", sizeof(sig)) == 0) { 5482 kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig)); 5483 emul_type = EMULTYPE_TRAP_UD_FORCED; 5484 } 5485 5486 return kvm_emulate_instruction(vcpu, emul_type); 5487 } 5488 EXPORT_SYMBOL_GPL(handle_ud); 5489 5490 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 5491 gpa_t gpa, bool write) 5492 { 5493 /* For APIC access vmexit */ 5494 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 5495 return 1; 5496 5497 if (vcpu_match_mmio_gpa(vcpu, gpa)) { 5498 trace_vcpu_match_mmio(gva, gpa, write, true); 5499 return 1; 5500 } 5501 5502 return 0; 5503 } 5504 5505 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 5506 gpa_t *gpa, struct x86_exception *exception, 5507 bool write) 5508 { 5509 u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0) 5510 | (write ? PFERR_WRITE_MASK : 0); 5511 5512 /* 5513 * currently PKRU is only applied to ept enabled guest so 5514 * there is no pkey in EPT page table for L1 guest or EPT 5515 * shadow page table for L2 guest. 5516 */ 5517 if (vcpu_match_mmio_gva(vcpu, gva) 5518 && !permission_fault(vcpu, vcpu->arch.walk_mmu, 5519 vcpu->arch.mmio_access, 0, access)) { 5520 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | 5521 (gva & (PAGE_SIZE - 1)); 5522 trace_vcpu_match_mmio(gva, *gpa, write, false); 5523 return 1; 5524 } 5525 5526 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5527 5528 if (*gpa == UNMAPPED_GVA) 5529 return -1; 5530 5531 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write); 5532 } 5533 5534 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, 5535 const void *val, int bytes) 5536 { 5537 int ret; 5538 5539 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes); 5540 if (ret < 0) 5541 return 0; 5542 kvm_page_track_write(vcpu, gpa, val, bytes); 5543 return 1; 5544 } 5545 5546 struct read_write_emulator_ops { 5547 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val, 5548 int bytes); 5549 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa, 5550 void *val, int bytes); 5551 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 5552 int bytes, void *val); 5553 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 5554 void *val, int bytes); 5555 bool write; 5556 }; 5557 5558 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes) 5559 { 5560 if (vcpu->mmio_read_completed) { 5561 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, 5562 vcpu->mmio_fragments[0].gpa, val); 5563 vcpu->mmio_read_completed = 0; 5564 return 1; 5565 } 5566 5567 return 0; 5568 } 5569 5570 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 5571 void *val, int bytes) 5572 { 5573 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes); 5574 } 5575 5576 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 5577 void *val, int bytes) 5578 { 5579 return emulator_write_phys(vcpu, gpa, val, bytes); 5580 } 5581 5582 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val) 5583 { 5584 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val); 5585 return vcpu_mmio_write(vcpu, gpa, bytes, val); 5586 } 5587 5588 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 5589 void *val, int bytes) 5590 { 5591 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL); 5592 return X86EMUL_IO_NEEDED; 5593 } 5594 5595 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 5596 void *val, int bytes) 5597 { 5598 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0]; 5599 5600 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len)); 5601 return X86EMUL_CONTINUE; 5602 } 5603 5604 static const struct read_write_emulator_ops read_emultor = { 5605 .read_write_prepare = read_prepare, 5606 .read_write_emulate = read_emulate, 5607 .read_write_mmio = vcpu_mmio_read, 5608 .read_write_exit_mmio = read_exit_mmio, 5609 }; 5610 5611 static const struct read_write_emulator_ops write_emultor = { 5612 .read_write_emulate = write_emulate, 5613 .read_write_mmio = write_mmio, 5614 .read_write_exit_mmio = write_exit_mmio, 5615 .write = true, 5616 }; 5617 5618 static int emulator_read_write_onepage(unsigned long addr, void *val, 5619 unsigned int bytes, 5620 struct x86_exception *exception, 5621 struct kvm_vcpu *vcpu, 5622 const struct read_write_emulator_ops *ops) 5623 { 5624 gpa_t gpa; 5625 int handled, ret; 5626 bool write = ops->write; 5627 struct kvm_mmio_fragment *frag; 5628 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5629 5630 /* 5631 * If the exit was due to a NPF we may already have a GPA. 5632 * If the GPA is present, use it to avoid the GVA to GPA table walk. 5633 * Note, this cannot be used on string operations since string 5634 * operation using rep will only have the initial GPA from the NPF 5635 * occurred. 5636 */ 5637 if (vcpu->arch.gpa_available && 5638 emulator_can_use_gpa(ctxt) && 5639 (addr & ~PAGE_MASK) == (vcpu->arch.gpa_val & ~PAGE_MASK)) { 5640 gpa = vcpu->arch.gpa_val; 5641 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write); 5642 } else { 5643 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); 5644 if (ret < 0) 5645 return X86EMUL_PROPAGATE_FAULT; 5646 } 5647 5648 if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes)) 5649 return X86EMUL_CONTINUE; 5650 5651 /* 5652 * Is this MMIO handled locally? 5653 */ 5654 handled = ops->read_write_mmio(vcpu, gpa, bytes, val); 5655 if (handled == bytes) 5656 return X86EMUL_CONTINUE; 5657 5658 gpa += handled; 5659 bytes -= handled; 5660 val += handled; 5661 5662 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS); 5663 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++]; 5664 frag->gpa = gpa; 5665 frag->data = val; 5666 frag->len = bytes; 5667 return X86EMUL_CONTINUE; 5668 } 5669 5670 static int emulator_read_write(struct x86_emulate_ctxt *ctxt, 5671 unsigned long addr, 5672 void *val, unsigned int bytes, 5673 struct x86_exception *exception, 5674 const struct read_write_emulator_ops *ops) 5675 { 5676 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5677 gpa_t gpa; 5678 int rc; 5679 5680 if (ops->read_write_prepare && 5681 ops->read_write_prepare(vcpu, val, bytes)) 5682 return X86EMUL_CONTINUE; 5683 5684 vcpu->mmio_nr_fragments = 0; 5685 5686 /* Crossing a page boundary? */ 5687 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { 5688 int now; 5689 5690 now = -addr & ~PAGE_MASK; 5691 rc = emulator_read_write_onepage(addr, val, now, exception, 5692 vcpu, ops); 5693 5694 if (rc != X86EMUL_CONTINUE) 5695 return rc; 5696 addr += now; 5697 if (ctxt->mode != X86EMUL_MODE_PROT64) 5698 addr = (u32)addr; 5699 val += now; 5700 bytes -= now; 5701 } 5702 5703 rc = emulator_read_write_onepage(addr, val, bytes, exception, 5704 vcpu, ops); 5705 if (rc != X86EMUL_CONTINUE) 5706 return rc; 5707 5708 if (!vcpu->mmio_nr_fragments) 5709 return rc; 5710 5711 gpa = vcpu->mmio_fragments[0].gpa; 5712 5713 vcpu->mmio_needed = 1; 5714 vcpu->mmio_cur_fragment = 0; 5715 5716 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len); 5717 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write; 5718 vcpu->run->exit_reason = KVM_EXIT_MMIO; 5719 vcpu->run->mmio.phys_addr = gpa; 5720 5721 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); 5722 } 5723 5724 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, 5725 unsigned long addr, 5726 void *val, 5727 unsigned int bytes, 5728 struct x86_exception *exception) 5729 { 5730 return emulator_read_write(ctxt, addr, val, bytes, 5731 exception, &read_emultor); 5732 } 5733 5734 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, 5735 unsigned long addr, 5736 const void *val, 5737 unsigned int bytes, 5738 struct x86_exception *exception) 5739 { 5740 return emulator_read_write(ctxt, addr, (void *)val, bytes, 5741 exception, &write_emultor); 5742 } 5743 5744 #define CMPXCHG_TYPE(t, ptr, old, new) \ 5745 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old)) 5746 5747 #ifdef CONFIG_X86_64 5748 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new) 5749 #else 5750 # define CMPXCHG64(ptr, old, new) \ 5751 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old)) 5752 #endif 5753 5754 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, 5755 unsigned long addr, 5756 const void *old, 5757 const void *new, 5758 unsigned int bytes, 5759 struct x86_exception *exception) 5760 { 5761 struct kvm_host_map map; 5762 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5763 gpa_t gpa; 5764 char *kaddr; 5765 bool exchanged; 5766 5767 /* guests cmpxchg8b have to be emulated atomically */ 5768 if (bytes > 8 || (bytes & (bytes - 1))) 5769 goto emul_write; 5770 5771 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); 5772 5773 if (gpa == UNMAPPED_GVA || 5774 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 5775 goto emul_write; 5776 5777 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) 5778 goto emul_write; 5779 5780 if (kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), &map)) 5781 goto emul_write; 5782 5783 kaddr = map.hva + offset_in_page(gpa); 5784 5785 switch (bytes) { 5786 case 1: 5787 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new); 5788 break; 5789 case 2: 5790 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new); 5791 break; 5792 case 4: 5793 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new); 5794 break; 5795 case 8: 5796 exchanged = CMPXCHG64(kaddr, old, new); 5797 break; 5798 default: 5799 BUG(); 5800 } 5801 5802 kvm_vcpu_unmap(vcpu, &map, true); 5803 5804 if (!exchanged) 5805 return X86EMUL_CMPXCHG_FAILED; 5806 5807 kvm_page_track_write(vcpu, gpa, new, bytes); 5808 5809 return X86EMUL_CONTINUE; 5810 5811 emul_write: 5812 printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); 5813 5814 return emulator_write_emulated(ctxt, addr, new, bytes, exception); 5815 } 5816 5817 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) 5818 { 5819 int r = 0, i; 5820 5821 for (i = 0; i < vcpu->arch.pio.count; i++) { 5822 if (vcpu->arch.pio.in) 5823 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port, 5824 vcpu->arch.pio.size, pd); 5825 else 5826 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, 5827 vcpu->arch.pio.port, vcpu->arch.pio.size, 5828 pd); 5829 if (r) 5830 break; 5831 pd += vcpu->arch.pio.size; 5832 } 5833 return r; 5834 } 5835 5836 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, 5837 unsigned short port, void *val, 5838 unsigned int count, bool in) 5839 { 5840 vcpu->arch.pio.port = port; 5841 vcpu->arch.pio.in = in; 5842 vcpu->arch.pio.count = count; 5843 vcpu->arch.pio.size = size; 5844 5845 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { 5846 vcpu->arch.pio.count = 0; 5847 return 1; 5848 } 5849 5850 vcpu->run->exit_reason = KVM_EXIT_IO; 5851 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; 5852 vcpu->run->io.size = size; 5853 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; 5854 vcpu->run->io.count = count; 5855 vcpu->run->io.port = port; 5856 5857 return 0; 5858 } 5859 5860 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, 5861 int size, unsigned short port, void *val, 5862 unsigned int count) 5863 { 5864 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5865 int ret; 5866 5867 if (vcpu->arch.pio.count) 5868 goto data_avail; 5869 5870 memset(vcpu->arch.pio_data, 0, size * count); 5871 5872 ret = emulator_pio_in_out(vcpu, size, port, val, count, true); 5873 if (ret) { 5874 data_avail: 5875 memcpy(val, vcpu->arch.pio_data, size * count); 5876 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); 5877 vcpu->arch.pio.count = 0; 5878 return 1; 5879 } 5880 5881 return 0; 5882 } 5883 5884 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, 5885 int size, unsigned short port, 5886 const void *val, unsigned int count) 5887 { 5888 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5889 5890 memcpy(vcpu->arch.pio_data, val, size * count); 5891 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); 5892 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); 5893 } 5894 5895 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) 5896 { 5897 return kvm_x86_ops->get_segment_base(vcpu, seg); 5898 } 5899 5900 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address) 5901 { 5902 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address); 5903 } 5904 5905 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu) 5906 { 5907 if (!need_emulate_wbinvd(vcpu)) 5908 return X86EMUL_CONTINUE; 5909 5910 if (kvm_x86_ops->has_wbinvd_exit()) { 5911 int cpu = get_cpu(); 5912 5913 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 5914 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask, 5915 wbinvd_ipi, NULL, 1); 5916 put_cpu(); 5917 cpumask_clear(vcpu->arch.wbinvd_dirty_mask); 5918 } else 5919 wbinvd(); 5920 return X86EMUL_CONTINUE; 5921 } 5922 5923 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu) 5924 { 5925 kvm_emulate_wbinvd_noskip(vcpu); 5926 return kvm_skip_emulated_instruction(vcpu); 5927 } 5928 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd); 5929 5930 5931 5932 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt) 5933 { 5934 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt)); 5935 } 5936 5937 static int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, 5938 unsigned long *dest) 5939 { 5940 return kvm_get_dr(emul_to_vcpu(ctxt), dr, dest); 5941 } 5942 5943 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, 5944 unsigned long value) 5945 { 5946 5947 return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value); 5948 } 5949 5950 static u64 mk_cr_64(u64 curr_cr, u32 new_val) 5951 { 5952 return (curr_cr & ~((1ULL << 32) - 1)) | new_val; 5953 } 5954 5955 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr) 5956 { 5957 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5958 unsigned long value; 5959 5960 switch (cr) { 5961 case 0: 5962 value = kvm_read_cr0(vcpu); 5963 break; 5964 case 2: 5965 value = vcpu->arch.cr2; 5966 break; 5967 case 3: 5968 value = kvm_read_cr3(vcpu); 5969 break; 5970 case 4: 5971 value = kvm_read_cr4(vcpu); 5972 break; 5973 case 8: 5974 value = kvm_get_cr8(vcpu); 5975 break; 5976 default: 5977 kvm_err("%s: unexpected cr %u\n", __func__, cr); 5978 return 0; 5979 } 5980 5981 return value; 5982 } 5983 5984 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val) 5985 { 5986 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5987 int res = 0; 5988 5989 switch (cr) { 5990 case 0: 5991 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); 5992 break; 5993 case 2: 5994 vcpu->arch.cr2 = val; 5995 break; 5996 case 3: 5997 res = kvm_set_cr3(vcpu, val); 5998 break; 5999 case 4: 6000 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); 6001 break; 6002 case 8: 6003 res = kvm_set_cr8(vcpu, val); 6004 break; 6005 default: 6006 kvm_err("%s: unexpected cr %u\n", __func__, cr); 6007 res = -1; 6008 } 6009 6010 return res; 6011 } 6012 6013 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt) 6014 { 6015 return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt)); 6016 } 6017 6018 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6019 { 6020 kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt); 6021 } 6022 6023 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6024 { 6025 kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt); 6026 } 6027 6028 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6029 { 6030 kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt); 6031 } 6032 6033 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 6034 { 6035 kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt); 6036 } 6037 6038 static unsigned long emulator_get_cached_segment_base( 6039 struct x86_emulate_ctxt *ctxt, int seg) 6040 { 6041 return get_segment_base(emul_to_vcpu(ctxt), seg); 6042 } 6043 6044 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector, 6045 struct desc_struct *desc, u32 *base3, 6046 int seg) 6047 { 6048 struct kvm_segment var; 6049 6050 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg); 6051 *selector = var.selector; 6052 6053 if (var.unusable) { 6054 memset(desc, 0, sizeof(*desc)); 6055 if (base3) 6056 *base3 = 0; 6057 return false; 6058 } 6059 6060 if (var.g) 6061 var.limit >>= 12; 6062 set_desc_limit(desc, var.limit); 6063 set_desc_base(desc, (unsigned long)var.base); 6064 #ifdef CONFIG_X86_64 6065 if (base3) 6066 *base3 = var.base >> 32; 6067 #endif 6068 desc->type = var.type; 6069 desc->s = var.s; 6070 desc->dpl = var.dpl; 6071 desc->p = var.present; 6072 desc->avl = var.avl; 6073 desc->l = var.l; 6074 desc->d = var.db; 6075 desc->g = var.g; 6076 6077 return true; 6078 } 6079 6080 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector, 6081 struct desc_struct *desc, u32 base3, 6082 int seg) 6083 { 6084 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6085 struct kvm_segment var; 6086 6087 var.selector = selector; 6088 var.base = get_desc_base(desc); 6089 #ifdef CONFIG_X86_64 6090 var.base |= ((u64)base3) << 32; 6091 #endif 6092 var.limit = get_desc_limit(desc); 6093 if (desc->g) 6094 var.limit = (var.limit << 12) | 0xfff; 6095 var.type = desc->type; 6096 var.dpl = desc->dpl; 6097 var.db = desc->d; 6098 var.s = desc->s; 6099 var.l = desc->l; 6100 var.g = desc->g; 6101 var.avl = desc->avl; 6102 var.present = desc->p; 6103 var.unusable = !var.present; 6104 var.padding = 0; 6105 6106 kvm_set_segment(vcpu, &var, seg); 6107 return; 6108 } 6109 6110 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, 6111 u32 msr_index, u64 *pdata) 6112 { 6113 return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata); 6114 } 6115 6116 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, 6117 u32 msr_index, u64 data) 6118 { 6119 return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data); 6120 } 6121 6122 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt) 6123 { 6124 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6125 6126 return vcpu->arch.smbase; 6127 } 6128 6129 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase) 6130 { 6131 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6132 6133 vcpu->arch.smbase = smbase; 6134 } 6135 6136 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt, 6137 u32 pmc) 6138 { 6139 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt), pmc); 6140 } 6141 6142 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, 6143 u32 pmc, u64 *pdata) 6144 { 6145 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata); 6146 } 6147 6148 static void emulator_halt(struct x86_emulate_ctxt *ctxt) 6149 { 6150 emul_to_vcpu(ctxt)->arch.halt_request = 1; 6151 } 6152 6153 static int emulator_intercept(struct x86_emulate_ctxt *ctxt, 6154 struct x86_instruction_info *info, 6155 enum x86_intercept_stage stage) 6156 { 6157 return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage); 6158 } 6159 6160 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, 6161 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, bool check_limit) 6162 { 6163 return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, check_limit); 6164 } 6165 6166 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) 6167 { 6168 return kvm_register_read(emul_to_vcpu(ctxt), reg); 6169 } 6170 6171 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) 6172 { 6173 kvm_register_write(emul_to_vcpu(ctxt), reg, val); 6174 } 6175 6176 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked) 6177 { 6178 kvm_x86_ops->set_nmi_mask(emul_to_vcpu(ctxt), masked); 6179 } 6180 6181 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt) 6182 { 6183 return emul_to_vcpu(ctxt)->arch.hflags; 6184 } 6185 6186 static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags) 6187 { 6188 emul_to_vcpu(ctxt)->arch.hflags = emul_flags; 6189 } 6190 6191 static int emulator_pre_leave_smm(struct x86_emulate_ctxt *ctxt, 6192 const char *smstate) 6193 { 6194 return kvm_x86_ops->pre_leave_smm(emul_to_vcpu(ctxt), smstate); 6195 } 6196 6197 static void emulator_post_leave_smm(struct x86_emulate_ctxt *ctxt) 6198 { 6199 kvm_smm_changed(emul_to_vcpu(ctxt)); 6200 } 6201 6202 static int emulator_set_xcr(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr) 6203 { 6204 return __kvm_set_xcr(emul_to_vcpu(ctxt), index, xcr); 6205 } 6206 6207 static const struct x86_emulate_ops emulate_ops = { 6208 .read_gpr = emulator_read_gpr, 6209 .write_gpr = emulator_write_gpr, 6210 .read_std = emulator_read_std, 6211 .write_std = emulator_write_std, 6212 .read_phys = kvm_read_guest_phys_system, 6213 .fetch = kvm_fetch_guest_virt, 6214 .read_emulated = emulator_read_emulated, 6215 .write_emulated = emulator_write_emulated, 6216 .cmpxchg_emulated = emulator_cmpxchg_emulated, 6217 .invlpg = emulator_invlpg, 6218 .pio_in_emulated = emulator_pio_in_emulated, 6219 .pio_out_emulated = emulator_pio_out_emulated, 6220 .get_segment = emulator_get_segment, 6221 .set_segment = emulator_set_segment, 6222 .get_cached_segment_base = emulator_get_cached_segment_base, 6223 .get_gdt = emulator_get_gdt, 6224 .get_idt = emulator_get_idt, 6225 .set_gdt = emulator_set_gdt, 6226 .set_idt = emulator_set_idt, 6227 .get_cr = emulator_get_cr, 6228 .set_cr = emulator_set_cr, 6229 .cpl = emulator_get_cpl, 6230 .get_dr = emulator_get_dr, 6231 .set_dr = emulator_set_dr, 6232 .get_smbase = emulator_get_smbase, 6233 .set_smbase = emulator_set_smbase, 6234 .set_msr = emulator_set_msr, 6235 .get_msr = emulator_get_msr, 6236 .check_pmc = emulator_check_pmc, 6237 .read_pmc = emulator_read_pmc, 6238 .halt = emulator_halt, 6239 .wbinvd = emulator_wbinvd, 6240 .fix_hypercall = emulator_fix_hypercall, 6241 .intercept = emulator_intercept, 6242 .get_cpuid = emulator_get_cpuid, 6243 .set_nmi_mask = emulator_set_nmi_mask, 6244 .get_hflags = emulator_get_hflags, 6245 .set_hflags = emulator_set_hflags, 6246 .pre_leave_smm = emulator_pre_leave_smm, 6247 .post_leave_smm = emulator_post_leave_smm, 6248 .set_xcr = emulator_set_xcr, 6249 }; 6250 6251 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) 6252 { 6253 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 6254 /* 6255 * an sti; sti; sequence only disable interrupts for the first 6256 * instruction. So, if the last instruction, be it emulated or 6257 * not, left the system with the INT_STI flag enabled, it 6258 * means that the last instruction is an sti. We should not 6259 * leave the flag on in this case. The same goes for mov ss 6260 */ 6261 if (int_shadow & mask) 6262 mask = 0; 6263 if (unlikely(int_shadow || mask)) { 6264 kvm_x86_ops->set_interrupt_shadow(vcpu, mask); 6265 if (!mask) 6266 kvm_make_request(KVM_REQ_EVENT, vcpu); 6267 } 6268 } 6269 6270 static bool inject_emulated_exception(struct kvm_vcpu *vcpu) 6271 { 6272 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 6273 if (ctxt->exception.vector == PF_VECTOR) 6274 return kvm_propagate_fault(vcpu, &ctxt->exception); 6275 6276 if (ctxt->exception.error_code_valid) 6277 kvm_queue_exception_e(vcpu, ctxt->exception.vector, 6278 ctxt->exception.error_code); 6279 else 6280 kvm_queue_exception(vcpu, ctxt->exception.vector); 6281 return false; 6282 } 6283 6284 static void init_emulate_ctxt(struct kvm_vcpu *vcpu) 6285 { 6286 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 6287 int cs_db, cs_l; 6288 6289 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 6290 6291 ctxt->eflags = kvm_get_rflags(vcpu); 6292 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0; 6293 6294 ctxt->eip = kvm_rip_read(vcpu); 6295 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : 6296 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : 6297 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 : 6298 cs_db ? X86EMUL_MODE_PROT32 : 6299 X86EMUL_MODE_PROT16; 6300 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK); 6301 BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); 6302 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK); 6303 6304 init_decode_cache(ctxt); 6305 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 6306 } 6307 6308 void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) 6309 { 6310 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 6311 int ret; 6312 6313 init_emulate_ctxt(vcpu); 6314 6315 ctxt->op_bytes = 2; 6316 ctxt->ad_bytes = 2; 6317 ctxt->_eip = ctxt->eip + inc_eip; 6318 ret = emulate_int_real(ctxt, irq); 6319 6320 if (ret != X86EMUL_CONTINUE) { 6321 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 6322 } else { 6323 ctxt->eip = ctxt->_eip; 6324 kvm_rip_write(vcpu, ctxt->eip); 6325 kvm_set_rflags(vcpu, ctxt->eflags); 6326 } 6327 } 6328 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt); 6329 6330 static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type) 6331 { 6332 ++vcpu->stat.insn_emulation_fail; 6333 trace_kvm_emulate_insn_failed(vcpu); 6334 6335 if (emulation_type & EMULTYPE_VMWARE_GP) { 6336 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 6337 return 1; 6338 } 6339 6340 if (emulation_type & EMULTYPE_SKIP) { 6341 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 6342 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 6343 vcpu->run->internal.ndata = 0; 6344 return 0; 6345 } 6346 6347 kvm_queue_exception(vcpu, UD_VECTOR); 6348 6349 if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) { 6350 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 6351 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 6352 vcpu->run->internal.ndata = 0; 6353 return 0; 6354 } 6355 6356 return 1; 6357 } 6358 6359 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2, 6360 bool write_fault_to_shadow_pgtable, 6361 int emulation_type) 6362 { 6363 gpa_t gpa = cr2; 6364 kvm_pfn_t pfn; 6365 6366 if (!(emulation_type & EMULTYPE_ALLOW_RETRY)) 6367 return false; 6368 6369 if (WARN_ON_ONCE(is_guest_mode(vcpu))) 6370 return false; 6371 6372 if (!vcpu->arch.mmu->direct_map) { 6373 /* 6374 * Write permission should be allowed since only 6375 * write access need to be emulated. 6376 */ 6377 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 6378 6379 /* 6380 * If the mapping is invalid in guest, let cpu retry 6381 * it to generate fault. 6382 */ 6383 if (gpa == UNMAPPED_GVA) 6384 return true; 6385 } 6386 6387 /* 6388 * Do not retry the unhandleable instruction if it faults on the 6389 * readonly host memory, otherwise it will goto a infinite loop: 6390 * retry instruction -> write #PF -> emulation fail -> retry 6391 * instruction -> ... 6392 */ 6393 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); 6394 6395 /* 6396 * If the instruction failed on the error pfn, it can not be fixed, 6397 * report the error to userspace. 6398 */ 6399 if (is_error_noslot_pfn(pfn)) 6400 return false; 6401 6402 kvm_release_pfn_clean(pfn); 6403 6404 /* The instructions are well-emulated on direct mmu. */ 6405 if (vcpu->arch.mmu->direct_map) { 6406 unsigned int indirect_shadow_pages; 6407 6408 spin_lock(&vcpu->kvm->mmu_lock); 6409 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; 6410 spin_unlock(&vcpu->kvm->mmu_lock); 6411 6412 if (indirect_shadow_pages) 6413 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 6414 6415 return true; 6416 } 6417 6418 /* 6419 * if emulation was due to access to shadowed page table 6420 * and it failed try to unshadow page and re-enter the 6421 * guest to let CPU execute the instruction. 6422 */ 6423 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 6424 6425 /* 6426 * If the access faults on its page table, it can not 6427 * be fixed by unprotecting shadow page and it should 6428 * be reported to userspace. 6429 */ 6430 return !write_fault_to_shadow_pgtable; 6431 } 6432 6433 static bool retry_instruction(struct x86_emulate_ctxt *ctxt, 6434 unsigned long cr2, int emulation_type) 6435 { 6436 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6437 unsigned long last_retry_eip, last_retry_addr, gpa = cr2; 6438 6439 last_retry_eip = vcpu->arch.last_retry_eip; 6440 last_retry_addr = vcpu->arch.last_retry_addr; 6441 6442 /* 6443 * If the emulation is caused by #PF and it is non-page_table 6444 * writing instruction, it means the VM-EXIT is caused by shadow 6445 * page protected, we can zap the shadow page and retry this 6446 * instruction directly. 6447 * 6448 * Note: if the guest uses a non-page-table modifying instruction 6449 * on the PDE that points to the instruction, then we will unmap 6450 * the instruction and go to an infinite loop. So, we cache the 6451 * last retried eip and the last fault address, if we meet the eip 6452 * and the address again, we can break out of the potential infinite 6453 * loop. 6454 */ 6455 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0; 6456 6457 if (!(emulation_type & EMULTYPE_ALLOW_RETRY)) 6458 return false; 6459 6460 if (WARN_ON_ONCE(is_guest_mode(vcpu))) 6461 return false; 6462 6463 if (x86_page_table_writing_insn(ctxt)) 6464 return false; 6465 6466 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2) 6467 return false; 6468 6469 vcpu->arch.last_retry_eip = ctxt->eip; 6470 vcpu->arch.last_retry_addr = cr2; 6471 6472 if (!vcpu->arch.mmu->direct_map) 6473 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 6474 6475 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 6476 6477 return true; 6478 } 6479 6480 static int complete_emulated_mmio(struct kvm_vcpu *vcpu); 6481 static int complete_emulated_pio(struct kvm_vcpu *vcpu); 6482 6483 static void kvm_smm_changed(struct kvm_vcpu *vcpu) 6484 { 6485 if (!(vcpu->arch.hflags & HF_SMM_MASK)) { 6486 /* This is a good place to trace that we are exiting SMM. */ 6487 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, false); 6488 6489 /* Process a latched INIT or SMI, if any. */ 6490 kvm_make_request(KVM_REQ_EVENT, vcpu); 6491 } 6492 6493 kvm_mmu_reset_context(vcpu); 6494 } 6495 6496 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7, 6497 unsigned long *db) 6498 { 6499 u32 dr6 = 0; 6500 int i; 6501 u32 enable, rwlen; 6502 6503 enable = dr7; 6504 rwlen = dr7 >> 16; 6505 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4) 6506 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr) 6507 dr6 |= (1 << i); 6508 return dr6; 6509 } 6510 6511 static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu) 6512 { 6513 struct kvm_run *kvm_run = vcpu->run; 6514 6515 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { 6516 kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 | DR6_RTM; 6517 kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip; 6518 kvm_run->debug.arch.exception = DB_VECTOR; 6519 kvm_run->exit_reason = KVM_EXIT_DEBUG; 6520 return 0; 6521 } 6522 kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS); 6523 return 1; 6524 } 6525 6526 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu) 6527 { 6528 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 6529 int r; 6530 6531 r = kvm_x86_ops->skip_emulated_instruction(vcpu); 6532 if (unlikely(!r)) 6533 return 0; 6534 6535 /* 6536 * rflags is the old, "raw" value of the flags. The new value has 6537 * not been saved yet. 6538 * 6539 * This is correct even for TF set by the guest, because "the 6540 * processor will not generate this exception after the instruction 6541 * that sets the TF flag". 6542 */ 6543 if (unlikely(rflags & X86_EFLAGS_TF)) 6544 r = kvm_vcpu_do_singlestep(vcpu); 6545 return r; 6546 } 6547 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction); 6548 6549 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) 6550 { 6551 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) && 6552 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) { 6553 struct kvm_run *kvm_run = vcpu->run; 6554 unsigned long eip = kvm_get_linear_rip(vcpu); 6555 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 6556 vcpu->arch.guest_debug_dr7, 6557 vcpu->arch.eff_db); 6558 6559 if (dr6 != 0) { 6560 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM; 6561 kvm_run->debug.arch.pc = eip; 6562 kvm_run->debug.arch.exception = DB_VECTOR; 6563 kvm_run->exit_reason = KVM_EXIT_DEBUG; 6564 *r = 0; 6565 return true; 6566 } 6567 } 6568 6569 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) && 6570 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) { 6571 unsigned long eip = kvm_get_linear_rip(vcpu); 6572 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 6573 vcpu->arch.dr7, 6574 vcpu->arch.db); 6575 6576 if (dr6 != 0) { 6577 vcpu->arch.dr6 &= ~DR_TRAP_BITS; 6578 vcpu->arch.dr6 |= dr6 | DR6_RTM; 6579 kvm_queue_exception(vcpu, DB_VECTOR); 6580 *r = 1; 6581 return true; 6582 } 6583 } 6584 6585 return false; 6586 } 6587 6588 static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt) 6589 { 6590 switch (ctxt->opcode_len) { 6591 case 1: 6592 switch (ctxt->b) { 6593 case 0xe4: /* IN */ 6594 case 0xe5: 6595 case 0xec: 6596 case 0xed: 6597 case 0xe6: /* OUT */ 6598 case 0xe7: 6599 case 0xee: 6600 case 0xef: 6601 case 0x6c: /* INS */ 6602 case 0x6d: 6603 case 0x6e: /* OUTS */ 6604 case 0x6f: 6605 return true; 6606 } 6607 break; 6608 case 2: 6609 switch (ctxt->b) { 6610 case 0x33: /* RDPMC */ 6611 return true; 6612 } 6613 break; 6614 } 6615 6616 return false; 6617 } 6618 6619 int x86_emulate_instruction(struct kvm_vcpu *vcpu, 6620 unsigned long cr2, 6621 int emulation_type, 6622 void *insn, 6623 int insn_len) 6624 { 6625 int r; 6626 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 6627 bool writeback = true; 6628 bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable; 6629 6630 vcpu->arch.l1tf_flush_l1d = true; 6631 6632 /* 6633 * Clear write_fault_to_shadow_pgtable here to ensure it is 6634 * never reused. 6635 */ 6636 vcpu->arch.write_fault_to_shadow_pgtable = false; 6637 kvm_clear_exception_queue(vcpu); 6638 6639 if (!(emulation_type & EMULTYPE_NO_DECODE)) { 6640 init_emulate_ctxt(vcpu); 6641 6642 /* 6643 * We will reenter on the same instruction since 6644 * we do not set complete_userspace_io. This does not 6645 * handle watchpoints yet, those would be handled in 6646 * the emulate_ops. 6647 */ 6648 if (!(emulation_type & EMULTYPE_SKIP) && 6649 kvm_vcpu_check_breakpoint(vcpu, &r)) 6650 return r; 6651 6652 ctxt->interruptibility = 0; 6653 ctxt->have_exception = false; 6654 ctxt->exception.vector = -1; 6655 ctxt->perm_ok = false; 6656 6657 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD; 6658 6659 r = x86_decode_insn(ctxt, insn, insn_len); 6660 6661 trace_kvm_emulate_insn_start(vcpu); 6662 ++vcpu->stat.insn_emulation; 6663 if (r != EMULATION_OK) { 6664 if ((emulation_type & EMULTYPE_TRAP_UD) || 6665 (emulation_type & EMULTYPE_TRAP_UD_FORCED)) { 6666 kvm_queue_exception(vcpu, UD_VECTOR); 6667 return 1; 6668 } 6669 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 6670 emulation_type)) 6671 return 1; 6672 if (ctxt->have_exception) { 6673 /* 6674 * #UD should result in just EMULATION_FAILED, and trap-like 6675 * exception should not be encountered during decode. 6676 */ 6677 WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR || 6678 exception_type(ctxt->exception.vector) == EXCPT_TRAP); 6679 inject_emulated_exception(vcpu); 6680 return 1; 6681 } 6682 return handle_emulation_failure(vcpu, emulation_type); 6683 } 6684 } 6685 6686 if ((emulation_type & EMULTYPE_VMWARE_GP) && 6687 !is_vmware_backdoor_opcode(ctxt)) { 6688 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 6689 return 1; 6690 } 6691 6692 /* 6693 * Note, EMULTYPE_SKIP is intended for use *only* by vendor callbacks 6694 * for kvm_skip_emulated_instruction(). The caller is responsible for 6695 * updating interruptibility state and injecting single-step #DBs. 6696 */ 6697 if (emulation_type & EMULTYPE_SKIP) { 6698 kvm_rip_write(vcpu, ctxt->_eip); 6699 if (ctxt->eflags & X86_EFLAGS_RF) 6700 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF); 6701 return 1; 6702 } 6703 6704 if (retry_instruction(ctxt, cr2, emulation_type)) 6705 return 1; 6706 6707 /* this is needed for vmware backdoor interface to work since it 6708 changes registers values during IO operation */ 6709 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { 6710 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 6711 emulator_invalidate_register_cache(ctxt); 6712 } 6713 6714 restart: 6715 /* Save the faulting GPA (cr2) in the address field */ 6716 ctxt->exception.address = cr2; 6717 6718 r = x86_emulate_insn(ctxt); 6719 6720 if (r == EMULATION_INTERCEPTED) 6721 return 1; 6722 6723 if (r == EMULATION_FAILED) { 6724 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 6725 emulation_type)) 6726 return 1; 6727 6728 return handle_emulation_failure(vcpu, emulation_type); 6729 } 6730 6731 if (ctxt->have_exception) { 6732 r = 1; 6733 if (inject_emulated_exception(vcpu)) 6734 return r; 6735 } else if (vcpu->arch.pio.count) { 6736 if (!vcpu->arch.pio.in) { 6737 /* FIXME: return into emulator if single-stepping. */ 6738 vcpu->arch.pio.count = 0; 6739 } else { 6740 writeback = false; 6741 vcpu->arch.complete_userspace_io = complete_emulated_pio; 6742 } 6743 r = 0; 6744 } else if (vcpu->mmio_needed) { 6745 ++vcpu->stat.mmio_exits; 6746 6747 if (!vcpu->mmio_is_write) 6748 writeback = false; 6749 r = 0; 6750 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 6751 } else if (r == EMULATION_RESTART) 6752 goto restart; 6753 else 6754 r = 1; 6755 6756 if (writeback) { 6757 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 6758 toggle_interruptibility(vcpu, ctxt->interruptibility); 6759 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 6760 if (!ctxt->have_exception || 6761 exception_type(ctxt->exception.vector) == EXCPT_TRAP) { 6762 kvm_rip_write(vcpu, ctxt->eip); 6763 if (r && ctxt->tf) 6764 r = kvm_vcpu_do_singlestep(vcpu); 6765 __kvm_set_rflags(vcpu, ctxt->eflags); 6766 } 6767 6768 /* 6769 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will 6770 * do nothing, and it will be requested again as soon as 6771 * the shadow expires. But we still need to check here, 6772 * because POPF has no interrupt shadow. 6773 */ 6774 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF)) 6775 kvm_make_request(KVM_REQ_EVENT, vcpu); 6776 } else 6777 vcpu->arch.emulate_regs_need_sync_to_vcpu = true; 6778 6779 return r; 6780 } 6781 6782 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type) 6783 { 6784 return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0); 6785 } 6786 EXPORT_SYMBOL_GPL(kvm_emulate_instruction); 6787 6788 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu, 6789 void *insn, int insn_len) 6790 { 6791 return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len); 6792 } 6793 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer); 6794 6795 static int complete_fast_pio_out_port_0x7e(struct kvm_vcpu *vcpu) 6796 { 6797 vcpu->arch.pio.count = 0; 6798 return 1; 6799 } 6800 6801 static int complete_fast_pio_out(struct kvm_vcpu *vcpu) 6802 { 6803 vcpu->arch.pio.count = 0; 6804 6805 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) 6806 return 1; 6807 6808 return kvm_skip_emulated_instruction(vcpu); 6809 } 6810 6811 static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, 6812 unsigned short port) 6813 { 6814 unsigned long val = kvm_rax_read(vcpu); 6815 int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt, 6816 size, port, &val, 1); 6817 if (ret) 6818 return ret; 6819 6820 /* 6821 * Workaround userspace that relies on old KVM behavior of %rip being 6822 * incremented prior to exiting to userspace to handle "OUT 0x7e". 6823 */ 6824 if (port == 0x7e && 6825 kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_OUT_7E_INC_RIP)) { 6826 vcpu->arch.complete_userspace_io = 6827 complete_fast_pio_out_port_0x7e; 6828 kvm_skip_emulated_instruction(vcpu); 6829 } else { 6830 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu); 6831 vcpu->arch.complete_userspace_io = complete_fast_pio_out; 6832 } 6833 return 0; 6834 } 6835 6836 static int complete_fast_pio_in(struct kvm_vcpu *vcpu) 6837 { 6838 unsigned long val; 6839 6840 /* We should only ever be called with arch.pio.count equal to 1 */ 6841 BUG_ON(vcpu->arch.pio.count != 1); 6842 6843 if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.pio.linear_rip))) { 6844 vcpu->arch.pio.count = 0; 6845 return 1; 6846 } 6847 6848 /* For size less than 4 we merge, else we zero extend */ 6849 val = (vcpu->arch.pio.size < 4) ? kvm_rax_read(vcpu) : 0; 6850 6851 /* 6852 * Since vcpu->arch.pio.count == 1 let emulator_pio_in_emulated perform 6853 * the copy and tracing 6854 */ 6855 emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, vcpu->arch.pio.size, 6856 vcpu->arch.pio.port, &val, 1); 6857 kvm_rax_write(vcpu, val); 6858 6859 return kvm_skip_emulated_instruction(vcpu); 6860 } 6861 6862 static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, 6863 unsigned short port) 6864 { 6865 unsigned long val; 6866 int ret; 6867 6868 /* For size less than 4 we merge, else we zero extend */ 6869 val = (size < 4) ? kvm_rax_read(vcpu) : 0; 6870 6871 ret = emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, size, port, 6872 &val, 1); 6873 if (ret) { 6874 kvm_rax_write(vcpu, val); 6875 return ret; 6876 } 6877 6878 vcpu->arch.pio.linear_rip = kvm_get_linear_rip(vcpu); 6879 vcpu->arch.complete_userspace_io = complete_fast_pio_in; 6880 6881 return 0; 6882 } 6883 6884 int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in) 6885 { 6886 int ret; 6887 6888 if (in) 6889 ret = kvm_fast_pio_in(vcpu, size, port); 6890 else 6891 ret = kvm_fast_pio_out(vcpu, size, port); 6892 return ret && kvm_skip_emulated_instruction(vcpu); 6893 } 6894 EXPORT_SYMBOL_GPL(kvm_fast_pio); 6895 6896 static int kvmclock_cpu_down_prep(unsigned int cpu) 6897 { 6898 __this_cpu_write(cpu_tsc_khz, 0); 6899 return 0; 6900 } 6901 6902 static void tsc_khz_changed(void *data) 6903 { 6904 struct cpufreq_freqs *freq = data; 6905 unsigned long khz = 0; 6906 6907 if (data) 6908 khz = freq->new; 6909 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 6910 khz = cpufreq_quick_get(raw_smp_processor_id()); 6911 if (!khz) 6912 khz = tsc_khz; 6913 __this_cpu_write(cpu_tsc_khz, khz); 6914 } 6915 6916 #ifdef CONFIG_X86_64 6917 static void kvm_hyperv_tsc_notifier(void) 6918 { 6919 struct kvm *kvm; 6920 struct kvm_vcpu *vcpu; 6921 int cpu; 6922 6923 mutex_lock(&kvm_lock); 6924 list_for_each_entry(kvm, &vm_list, vm_list) 6925 kvm_make_mclock_inprogress_request(kvm); 6926 6927 hyperv_stop_tsc_emulation(); 6928 6929 /* TSC frequency always matches when on Hyper-V */ 6930 for_each_present_cpu(cpu) 6931 per_cpu(cpu_tsc_khz, cpu) = tsc_khz; 6932 kvm_max_guest_tsc_khz = tsc_khz; 6933 6934 list_for_each_entry(kvm, &vm_list, vm_list) { 6935 struct kvm_arch *ka = &kvm->arch; 6936 6937 spin_lock(&ka->pvclock_gtod_sync_lock); 6938 6939 pvclock_update_vm_gtod_copy(kvm); 6940 6941 kvm_for_each_vcpu(cpu, vcpu, kvm) 6942 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 6943 6944 kvm_for_each_vcpu(cpu, vcpu, kvm) 6945 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 6946 6947 spin_unlock(&ka->pvclock_gtod_sync_lock); 6948 } 6949 mutex_unlock(&kvm_lock); 6950 } 6951 #endif 6952 6953 static void __kvmclock_cpufreq_notifier(struct cpufreq_freqs *freq, int cpu) 6954 { 6955 struct kvm *kvm; 6956 struct kvm_vcpu *vcpu; 6957 int i, send_ipi = 0; 6958 6959 /* 6960 * We allow guests to temporarily run on slowing clocks, 6961 * provided we notify them after, or to run on accelerating 6962 * clocks, provided we notify them before. Thus time never 6963 * goes backwards. 6964 * 6965 * However, we have a problem. We can't atomically update 6966 * the frequency of a given CPU from this function; it is 6967 * merely a notifier, which can be called from any CPU. 6968 * Changing the TSC frequency at arbitrary points in time 6969 * requires a recomputation of local variables related to 6970 * the TSC for each VCPU. We must flag these local variables 6971 * to be updated and be sure the update takes place with the 6972 * new frequency before any guests proceed. 6973 * 6974 * Unfortunately, the combination of hotplug CPU and frequency 6975 * change creates an intractable locking scenario; the order 6976 * of when these callouts happen is undefined with respect to 6977 * CPU hotplug, and they can race with each other. As such, 6978 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is 6979 * undefined; you can actually have a CPU frequency change take 6980 * place in between the computation of X and the setting of the 6981 * variable. To protect against this problem, all updates of 6982 * the per_cpu tsc_khz variable are done in an interrupt 6983 * protected IPI, and all callers wishing to update the value 6984 * must wait for a synchronous IPI to complete (which is trivial 6985 * if the caller is on the CPU already). This establishes the 6986 * necessary total order on variable updates. 6987 * 6988 * Note that because a guest time update may take place 6989 * anytime after the setting of the VCPU's request bit, the 6990 * correct TSC value must be set before the request. However, 6991 * to ensure the update actually makes it to any guest which 6992 * starts running in hardware virtualization between the set 6993 * and the acquisition of the spinlock, we must also ping the 6994 * CPU after setting the request bit. 6995 * 6996 */ 6997 6998 smp_call_function_single(cpu, tsc_khz_changed, freq, 1); 6999 7000 mutex_lock(&kvm_lock); 7001 list_for_each_entry(kvm, &vm_list, vm_list) { 7002 kvm_for_each_vcpu(i, vcpu, kvm) { 7003 if (vcpu->cpu != cpu) 7004 continue; 7005 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7006 if (vcpu->cpu != raw_smp_processor_id()) 7007 send_ipi = 1; 7008 } 7009 } 7010 mutex_unlock(&kvm_lock); 7011 7012 if (freq->old < freq->new && send_ipi) { 7013 /* 7014 * We upscale the frequency. Must make the guest 7015 * doesn't see old kvmclock values while running with 7016 * the new frequency, otherwise we risk the guest sees 7017 * time go backwards. 7018 * 7019 * In case we update the frequency for another cpu 7020 * (which might be in guest context) send an interrupt 7021 * to kick the cpu out of guest context. Next time 7022 * guest context is entered kvmclock will be updated, 7023 * so the guest will not see stale values. 7024 */ 7025 smp_call_function_single(cpu, tsc_khz_changed, freq, 1); 7026 } 7027 } 7028 7029 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 7030 void *data) 7031 { 7032 struct cpufreq_freqs *freq = data; 7033 int cpu; 7034 7035 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) 7036 return 0; 7037 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) 7038 return 0; 7039 7040 for_each_cpu(cpu, freq->policy->cpus) 7041 __kvmclock_cpufreq_notifier(freq, cpu); 7042 7043 return 0; 7044 } 7045 7046 static struct notifier_block kvmclock_cpufreq_notifier_block = { 7047 .notifier_call = kvmclock_cpufreq_notifier 7048 }; 7049 7050 static int kvmclock_cpu_online(unsigned int cpu) 7051 { 7052 tsc_khz_changed(NULL); 7053 return 0; 7054 } 7055 7056 static void kvm_timer_init(void) 7057 { 7058 max_tsc_khz = tsc_khz; 7059 7060 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { 7061 #ifdef CONFIG_CPU_FREQ 7062 struct cpufreq_policy policy; 7063 int cpu; 7064 7065 memset(&policy, 0, sizeof(policy)); 7066 cpu = get_cpu(); 7067 cpufreq_get_policy(&policy, cpu); 7068 if (policy.cpuinfo.max_freq) 7069 max_tsc_khz = policy.cpuinfo.max_freq; 7070 put_cpu(); 7071 #endif 7072 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, 7073 CPUFREQ_TRANSITION_NOTIFIER); 7074 } 7075 7076 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", 7077 kvmclock_cpu_online, kvmclock_cpu_down_prep); 7078 } 7079 7080 DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); 7081 EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu); 7082 7083 int kvm_is_in_guest(void) 7084 { 7085 return __this_cpu_read(current_vcpu) != NULL; 7086 } 7087 7088 static int kvm_is_user_mode(void) 7089 { 7090 int user_mode = 3; 7091 7092 if (__this_cpu_read(current_vcpu)) 7093 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu)); 7094 7095 return user_mode != 0; 7096 } 7097 7098 static unsigned long kvm_get_guest_ip(void) 7099 { 7100 unsigned long ip = 0; 7101 7102 if (__this_cpu_read(current_vcpu)) 7103 ip = kvm_rip_read(__this_cpu_read(current_vcpu)); 7104 7105 return ip; 7106 } 7107 7108 static void kvm_handle_intel_pt_intr(void) 7109 { 7110 struct kvm_vcpu *vcpu = __this_cpu_read(current_vcpu); 7111 7112 kvm_make_request(KVM_REQ_PMI, vcpu); 7113 __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT, 7114 (unsigned long *)&vcpu->arch.pmu.global_status); 7115 } 7116 7117 static struct perf_guest_info_callbacks kvm_guest_cbs = { 7118 .is_in_guest = kvm_is_in_guest, 7119 .is_user_mode = kvm_is_user_mode, 7120 .get_guest_ip = kvm_get_guest_ip, 7121 .handle_intel_pt_intr = kvm_handle_intel_pt_intr, 7122 }; 7123 7124 #ifdef CONFIG_X86_64 7125 static void pvclock_gtod_update_fn(struct work_struct *work) 7126 { 7127 struct kvm *kvm; 7128 7129 struct kvm_vcpu *vcpu; 7130 int i; 7131 7132 mutex_lock(&kvm_lock); 7133 list_for_each_entry(kvm, &vm_list, vm_list) 7134 kvm_for_each_vcpu(i, vcpu, kvm) 7135 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 7136 atomic_set(&kvm_guest_has_master_clock, 0); 7137 mutex_unlock(&kvm_lock); 7138 } 7139 7140 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn); 7141 7142 /* 7143 * Notification about pvclock gtod data update. 7144 */ 7145 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused, 7146 void *priv) 7147 { 7148 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 7149 struct timekeeper *tk = priv; 7150 7151 update_pvclock_gtod(tk); 7152 7153 /* disable master clock if host does not trust, or does not 7154 * use, TSC based clocksource. 7155 */ 7156 if (!gtod_is_based_on_tsc(gtod->clock.vclock_mode) && 7157 atomic_read(&kvm_guest_has_master_clock) != 0) 7158 queue_work(system_long_wq, &pvclock_gtod_work); 7159 7160 return 0; 7161 } 7162 7163 static struct notifier_block pvclock_gtod_notifier = { 7164 .notifier_call = pvclock_gtod_notify, 7165 }; 7166 #endif 7167 7168 int kvm_arch_init(void *opaque) 7169 { 7170 int r; 7171 struct kvm_x86_ops *ops = opaque; 7172 7173 if (kvm_x86_ops) { 7174 printk(KERN_ERR "kvm: already loaded the other module\n"); 7175 r = -EEXIST; 7176 goto out; 7177 } 7178 7179 if (!ops->cpu_has_kvm_support()) { 7180 printk(KERN_ERR "kvm: no hardware support\n"); 7181 r = -EOPNOTSUPP; 7182 goto out; 7183 } 7184 if (ops->disabled_by_bios()) { 7185 printk(KERN_ERR "kvm: disabled by bios\n"); 7186 r = -EOPNOTSUPP; 7187 goto out; 7188 } 7189 7190 /* 7191 * KVM explicitly assumes that the guest has an FPU and 7192 * FXSAVE/FXRSTOR. For example, the KVM_GET_FPU explicitly casts the 7193 * vCPU's FPU state as a fxregs_state struct. 7194 */ 7195 if (!boot_cpu_has(X86_FEATURE_FPU) || !boot_cpu_has(X86_FEATURE_FXSR)) { 7196 printk(KERN_ERR "kvm: inadequate fpu\n"); 7197 r = -EOPNOTSUPP; 7198 goto out; 7199 } 7200 7201 r = -ENOMEM; 7202 x86_fpu_cache = kmem_cache_create("x86_fpu", sizeof(struct fpu), 7203 __alignof__(struct fpu), SLAB_ACCOUNT, 7204 NULL); 7205 if (!x86_fpu_cache) { 7206 printk(KERN_ERR "kvm: failed to allocate cache for x86 fpu\n"); 7207 goto out; 7208 } 7209 7210 shared_msrs = alloc_percpu(struct kvm_shared_msrs); 7211 if (!shared_msrs) { 7212 printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n"); 7213 goto out_free_x86_fpu_cache; 7214 } 7215 7216 r = kvm_mmu_module_init(); 7217 if (r) 7218 goto out_free_percpu; 7219 7220 kvm_x86_ops = ops; 7221 7222 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, 7223 PT_DIRTY_MASK, PT64_NX_MASK, 0, 7224 PT_PRESENT_MASK, 0, sme_me_mask); 7225 kvm_timer_init(); 7226 7227 perf_register_guest_info_callbacks(&kvm_guest_cbs); 7228 7229 if (boot_cpu_has(X86_FEATURE_XSAVE)) 7230 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); 7231 7232 kvm_lapic_init(); 7233 if (pi_inject_timer == -1) 7234 pi_inject_timer = housekeeping_enabled(HK_FLAG_TIMER); 7235 #ifdef CONFIG_X86_64 7236 pvclock_gtod_register_notifier(&pvclock_gtod_notifier); 7237 7238 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 7239 set_hv_tscchange_cb(kvm_hyperv_tsc_notifier); 7240 #endif 7241 7242 return 0; 7243 7244 out_free_percpu: 7245 free_percpu(shared_msrs); 7246 out_free_x86_fpu_cache: 7247 kmem_cache_destroy(x86_fpu_cache); 7248 out: 7249 return r; 7250 } 7251 7252 void kvm_arch_exit(void) 7253 { 7254 #ifdef CONFIG_X86_64 7255 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 7256 clear_hv_tscchange_cb(); 7257 #endif 7258 kvm_lapic_exit(); 7259 perf_unregister_guest_info_callbacks(&kvm_guest_cbs); 7260 7261 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 7262 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, 7263 CPUFREQ_TRANSITION_NOTIFIER); 7264 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); 7265 #ifdef CONFIG_X86_64 7266 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); 7267 #endif 7268 kvm_x86_ops = NULL; 7269 kvm_mmu_module_exit(); 7270 free_percpu(shared_msrs); 7271 kmem_cache_destroy(x86_fpu_cache); 7272 } 7273 7274 int kvm_vcpu_halt(struct kvm_vcpu *vcpu) 7275 { 7276 ++vcpu->stat.halt_exits; 7277 if (lapic_in_kernel(vcpu)) { 7278 vcpu->arch.mp_state = KVM_MP_STATE_HALTED; 7279 return 1; 7280 } else { 7281 vcpu->run->exit_reason = KVM_EXIT_HLT; 7282 return 0; 7283 } 7284 } 7285 EXPORT_SYMBOL_GPL(kvm_vcpu_halt); 7286 7287 int kvm_emulate_halt(struct kvm_vcpu *vcpu) 7288 { 7289 int ret = kvm_skip_emulated_instruction(vcpu); 7290 /* 7291 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered 7292 * KVM_EXIT_DEBUG here. 7293 */ 7294 return kvm_vcpu_halt(vcpu) && ret; 7295 } 7296 EXPORT_SYMBOL_GPL(kvm_emulate_halt); 7297 7298 #ifdef CONFIG_X86_64 7299 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr, 7300 unsigned long clock_type) 7301 { 7302 struct kvm_clock_pairing clock_pairing; 7303 struct timespec64 ts; 7304 u64 cycle; 7305 int ret; 7306 7307 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK) 7308 return -KVM_EOPNOTSUPP; 7309 7310 if (kvm_get_walltime_and_clockread(&ts, &cycle) == false) 7311 return -KVM_EOPNOTSUPP; 7312 7313 clock_pairing.sec = ts.tv_sec; 7314 clock_pairing.nsec = ts.tv_nsec; 7315 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle); 7316 clock_pairing.flags = 0; 7317 memset(&clock_pairing.pad, 0, sizeof(clock_pairing.pad)); 7318 7319 ret = 0; 7320 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing, 7321 sizeof(struct kvm_clock_pairing))) 7322 ret = -KVM_EFAULT; 7323 7324 return ret; 7325 } 7326 #endif 7327 7328 /* 7329 * kvm_pv_kick_cpu_op: Kick a vcpu. 7330 * 7331 * @apicid - apicid of vcpu to be kicked. 7332 */ 7333 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) 7334 { 7335 struct kvm_lapic_irq lapic_irq; 7336 7337 lapic_irq.shorthand = 0; 7338 lapic_irq.dest_mode = 0; 7339 lapic_irq.level = 0; 7340 lapic_irq.dest_id = apicid; 7341 lapic_irq.msi_redir_hint = false; 7342 7343 lapic_irq.delivery_mode = APIC_DM_REMRD; 7344 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); 7345 } 7346 7347 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu) 7348 { 7349 if (!lapic_in_kernel(vcpu)) { 7350 WARN_ON_ONCE(vcpu->arch.apicv_active); 7351 return; 7352 } 7353 if (!vcpu->arch.apicv_active) 7354 return; 7355 7356 vcpu->arch.apicv_active = false; 7357 kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu); 7358 } 7359 7360 static void kvm_sched_yield(struct kvm *kvm, unsigned long dest_id) 7361 { 7362 struct kvm_vcpu *target = NULL; 7363 struct kvm_apic_map *map; 7364 7365 rcu_read_lock(); 7366 map = rcu_dereference(kvm->arch.apic_map); 7367 7368 if (likely(map) && dest_id <= map->max_apic_id && map->phys_map[dest_id]) 7369 target = map->phys_map[dest_id]->vcpu; 7370 7371 rcu_read_unlock(); 7372 7373 if (target && READ_ONCE(target->ready)) 7374 kvm_vcpu_yield_to(target); 7375 } 7376 7377 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) 7378 { 7379 unsigned long nr, a0, a1, a2, a3, ret; 7380 int op_64_bit; 7381 7382 if (kvm_hv_hypercall_enabled(vcpu->kvm)) 7383 return kvm_hv_hypercall(vcpu); 7384 7385 nr = kvm_rax_read(vcpu); 7386 a0 = kvm_rbx_read(vcpu); 7387 a1 = kvm_rcx_read(vcpu); 7388 a2 = kvm_rdx_read(vcpu); 7389 a3 = kvm_rsi_read(vcpu); 7390 7391 trace_kvm_hypercall(nr, a0, a1, a2, a3); 7392 7393 op_64_bit = is_64_bit_mode(vcpu); 7394 if (!op_64_bit) { 7395 nr &= 0xFFFFFFFF; 7396 a0 &= 0xFFFFFFFF; 7397 a1 &= 0xFFFFFFFF; 7398 a2 &= 0xFFFFFFFF; 7399 a3 &= 0xFFFFFFFF; 7400 } 7401 7402 if (kvm_x86_ops->get_cpl(vcpu) != 0) { 7403 ret = -KVM_EPERM; 7404 goto out; 7405 } 7406 7407 switch (nr) { 7408 case KVM_HC_VAPIC_POLL_IRQ: 7409 ret = 0; 7410 break; 7411 case KVM_HC_KICK_CPU: 7412 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1); 7413 kvm_sched_yield(vcpu->kvm, a1); 7414 ret = 0; 7415 break; 7416 #ifdef CONFIG_X86_64 7417 case KVM_HC_CLOCK_PAIRING: 7418 ret = kvm_pv_clock_pairing(vcpu, a0, a1); 7419 break; 7420 #endif 7421 case KVM_HC_SEND_IPI: 7422 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit); 7423 break; 7424 case KVM_HC_SCHED_YIELD: 7425 kvm_sched_yield(vcpu->kvm, a0); 7426 ret = 0; 7427 break; 7428 default: 7429 ret = -KVM_ENOSYS; 7430 break; 7431 } 7432 out: 7433 if (!op_64_bit) 7434 ret = (u32)ret; 7435 kvm_rax_write(vcpu, ret); 7436 7437 ++vcpu->stat.hypercalls; 7438 return kvm_skip_emulated_instruction(vcpu); 7439 } 7440 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); 7441 7442 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) 7443 { 7444 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 7445 char instruction[3]; 7446 unsigned long rip = kvm_rip_read(vcpu); 7447 7448 kvm_x86_ops->patch_hypercall(vcpu, instruction); 7449 7450 return emulator_write_emulated(ctxt, rip, instruction, 3, 7451 &ctxt->exception); 7452 } 7453 7454 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) 7455 { 7456 return vcpu->run->request_interrupt_window && 7457 likely(!pic_in_kernel(vcpu->kvm)); 7458 } 7459 7460 static void post_kvm_run_save(struct kvm_vcpu *vcpu) 7461 { 7462 struct kvm_run *kvm_run = vcpu->run; 7463 7464 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; 7465 kvm_run->flags = is_smm(vcpu) ? KVM_RUN_X86_SMM : 0; 7466 kvm_run->cr8 = kvm_get_cr8(vcpu); 7467 kvm_run->apic_base = kvm_get_apic_base(vcpu); 7468 kvm_run->ready_for_interrupt_injection = 7469 pic_in_kernel(vcpu->kvm) || 7470 kvm_vcpu_ready_for_interrupt_injection(vcpu); 7471 } 7472 7473 static void update_cr8_intercept(struct kvm_vcpu *vcpu) 7474 { 7475 int max_irr, tpr; 7476 7477 if (!kvm_x86_ops->update_cr8_intercept) 7478 return; 7479 7480 if (!lapic_in_kernel(vcpu)) 7481 return; 7482 7483 if (vcpu->arch.apicv_active) 7484 return; 7485 7486 if (!vcpu->arch.apic->vapic_addr) 7487 max_irr = kvm_lapic_find_highest_irr(vcpu); 7488 else 7489 max_irr = -1; 7490 7491 if (max_irr != -1) 7492 max_irr >>= 4; 7493 7494 tpr = kvm_lapic_get_cr8(vcpu); 7495 7496 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr); 7497 } 7498 7499 static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win) 7500 { 7501 int r; 7502 7503 /* try to reinject previous events if any */ 7504 7505 if (vcpu->arch.exception.injected) 7506 kvm_x86_ops->queue_exception(vcpu); 7507 /* 7508 * Do not inject an NMI or interrupt if there is a pending 7509 * exception. Exceptions and interrupts are recognized at 7510 * instruction boundaries, i.e. the start of an instruction. 7511 * Trap-like exceptions, e.g. #DB, have higher priority than 7512 * NMIs and interrupts, i.e. traps are recognized before an 7513 * NMI/interrupt that's pending on the same instruction. 7514 * Fault-like exceptions, e.g. #GP and #PF, are the lowest 7515 * priority, but are only generated (pended) during instruction 7516 * execution, i.e. a pending fault-like exception means the 7517 * fault occurred on the *previous* instruction and must be 7518 * serviced prior to recognizing any new events in order to 7519 * fully complete the previous instruction. 7520 */ 7521 else if (!vcpu->arch.exception.pending) { 7522 if (vcpu->arch.nmi_injected) 7523 kvm_x86_ops->set_nmi(vcpu); 7524 else if (vcpu->arch.interrupt.injected) 7525 kvm_x86_ops->set_irq(vcpu); 7526 } 7527 7528 /* 7529 * Call check_nested_events() even if we reinjected a previous event 7530 * in order for caller to determine if it should require immediate-exit 7531 * from L2 to L1 due to pending L1 events which require exit 7532 * from L2 to L1. 7533 */ 7534 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 7535 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 7536 if (r != 0) 7537 return r; 7538 } 7539 7540 /* try to inject new event if pending */ 7541 if (vcpu->arch.exception.pending) { 7542 trace_kvm_inj_exception(vcpu->arch.exception.nr, 7543 vcpu->arch.exception.has_error_code, 7544 vcpu->arch.exception.error_code); 7545 7546 WARN_ON_ONCE(vcpu->arch.exception.injected); 7547 vcpu->arch.exception.pending = false; 7548 vcpu->arch.exception.injected = true; 7549 7550 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT) 7551 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) | 7552 X86_EFLAGS_RF); 7553 7554 if (vcpu->arch.exception.nr == DB_VECTOR) { 7555 /* 7556 * This code assumes that nSVM doesn't use 7557 * check_nested_events(). If it does, the 7558 * DR6/DR7 changes should happen before L1 7559 * gets a #VMEXIT for an intercepted #DB in 7560 * L2. (Under VMX, on the other hand, the 7561 * DR6/DR7 changes should not happen in the 7562 * event of a VM-exit to L1 for an intercepted 7563 * #DB in L2.) 7564 */ 7565 kvm_deliver_exception_payload(vcpu); 7566 if (vcpu->arch.dr7 & DR7_GD) { 7567 vcpu->arch.dr7 &= ~DR7_GD; 7568 kvm_update_dr7(vcpu); 7569 } 7570 } 7571 7572 kvm_x86_ops->queue_exception(vcpu); 7573 } 7574 7575 /* Don't consider new event if we re-injected an event */ 7576 if (kvm_event_needs_reinjection(vcpu)) 7577 return 0; 7578 7579 if (vcpu->arch.smi_pending && !is_smm(vcpu) && 7580 kvm_x86_ops->smi_allowed(vcpu)) { 7581 vcpu->arch.smi_pending = false; 7582 ++vcpu->arch.smi_count; 7583 enter_smm(vcpu); 7584 } else if (vcpu->arch.nmi_pending && kvm_x86_ops->nmi_allowed(vcpu)) { 7585 --vcpu->arch.nmi_pending; 7586 vcpu->arch.nmi_injected = true; 7587 kvm_x86_ops->set_nmi(vcpu); 7588 } else if (kvm_cpu_has_injectable_intr(vcpu)) { 7589 /* 7590 * Because interrupts can be injected asynchronously, we are 7591 * calling check_nested_events again here to avoid a race condition. 7592 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this 7593 * proposal and current concerns. Perhaps we should be setting 7594 * KVM_REQ_EVENT only on certain events and not unconditionally? 7595 */ 7596 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 7597 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 7598 if (r != 0) 7599 return r; 7600 } 7601 if (kvm_x86_ops->interrupt_allowed(vcpu)) { 7602 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), 7603 false); 7604 kvm_x86_ops->set_irq(vcpu); 7605 } 7606 } 7607 7608 return 0; 7609 } 7610 7611 static void process_nmi(struct kvm_vcpu *vcpu) 7612 { 7613 unsigned limit = 2; 7614 7615 /* 7616 * x86 is limited to one NMI running, and one NMI pending after it. 7617 * If an NMI is already in progress, limit further NMIs to just one. 7618 * Otherwise, allow two (and we'll inject the first one immediately). 7619 */ 7620 if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected) 7621 limit = 1; 7622 7623 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0); 7624 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit); 7625 kvm_make_request(KVM_REQ_EVENT, vcpu); 7626 } 7627 7628 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) 7629 { 7630 u32 flags = 0; 7631 flags |= seg->g << 23; 7632 flags |= seg->db << 22; 7633 flags |= seg->l << 21; 7634 flags |= seg->avl << 20; 7635 flags |= seg->present << 15; 7636 flags |= seg->dpl << 13; 7637 flags |= seg->s << 12; 7638 flags |= seg->type << 8; 7639 return flags; 7640 } 7641 7642 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n) 7643 { 7644 struct kvm_segment seg; 7645 int offset; 7646 7647 kvm_get_segment(vcpu, &seg, n); 7648 put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector); 7649 7650 if (n < 3) 7651 offset = 0x7f84 + n * 12; 7652 else 7653 offset = 0x7f2c + (n - 3) * 12; 7654 7655 put_smstate(u32, buf, offset + 8, seg.base); 7656 put_smstate(u32, buf, offset + 4, seg.limit); 7657 put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg)); 7658 } 7659 7660 #ifdef CONFIG_X86_64 7661 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n) 7662 { 7663 struct kvm_segment seg; 7664 int offset; 7665 u16 flags; 7666 7667 kvm_get_segment(vcpu, &seg, n); 7668 offset = 0x7e00 + n * 16; 7669 7670 flags = enter_smm_get_segment_flags(&seg) >> 8; 7671 put_smstate(u16, buf, offset, seg.selector); 7672 put_smstate(u16, buf, offset + 2, flags); 7673 put_smstate(u32, buf, offset + 4, seg.limit); 7674 put_smstate(u64, buf, offset + 8, seg.base); 7675 } 7676 #endif 7677 7678 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf) 7679 { 7680 struct desc_ptr dt; 7681 struct kvm_segment seg; 7682 unsigned long val; 7683 int i; 7684 7685 put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu)); 7686 put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu)); 7687 put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu)); 7688 put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu)); 7689 7690 for (i = 0; i < 8; i++) 7691 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read(vcpu, i)); 7692 7693 kvm_get_dr(vcpu, 6, &val); 7694 put_smstate(u32, buf, 0x7fcc, (u32)val); 7695 kvm_get_dr(vcpu, 7, &val); 7696 put_smstate(u32, buf, 0x7fc8, (u32)val); 7697 7698 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 7699 put_smstate(u32, buf, 0x7fc4, seg.selector); 7700 put_smstate(u32, buf, 0x7f64, seg.base); 7701 put_smstate(u32, buf, 0x7f60, seg.limit); 7702 put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg)); 7703 7704 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 7705 put_smstate(u32, buf, 0x7fc0, seg.selector); 7706 put_smstate(u32, buf, 0x7f80, seg.base); 7707 put_smstate(u32, buf, 0x7f7c, seg.limit); 7708 put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg)); 7709 7710 kvm_x86_ops->get_gdt(vcpu, &dt); 7711 put_smstate(u32, buf, 0x7f74, dt.address); 7712 put_smstate(u32, buf, 0x7f70, dt.size); 7713 7714 kvm_x86_ops->get_idt(vcpu, &dt); 7715 put_smstate(u32, buf, 0x7f58, dt.address); 7716 put_smstate(u32, buf, 0x7f54, dt.size); 7717 7718 for (i = 0; i < 6; i++) 7719 enter_smm_save_seg_32(vcpu, buf, i); 7720 7721 put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu)); 7722 7723 /* revision id */ 7724 put_smstate(u32, buf, 0x7efc, 0x00020000); 7725 put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase); 7726 } 7727 7728 #ifdef CONFIG_X86_64 7729 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) 7730 { 7731 struct desc_ptr dt; 7732 struct kvm_segment seg; 7733 unsigned long val; 7734 int i; 7735 7736 for (i = 0; i < 16; i++) 7737 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read(vcpu, i)); 7738 7739 put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu)); 7740 put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu)); 7741 7742 kvm_get_dr(vcpu, 6, &val); 7743 put_smstate(u64, buf, 0x7f68, val); 7744 kvm_get_dr(vcpu, 7, &val); 7745 put_smstate(u64, buf, 0x7f60, val); 7746 7747 put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu)); 7748 put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu)); 7749 put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu)); 7750 7751 put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase); 7752 7753 /* revision id */ 7754 put_smstate(u32, buf, 0x7efc, 0x00020064); 7755 7756 put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer); 7757 7758 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 7759 put_smstate(u16, buf, 0x7e90, seg.selector); 7760 put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8); 7761 put_smstate(u32, buf, 0x7e94, seg.limit); 7762 put_smstate(u64, buf, 0x7e98, seg.base); 7763 7764 kvm_x86_ops->get_idt(vcpu, &dt); 7765 put_smstate(u32, buf, 0x7e84, dt.size); 7766 put_smstate(u64, buf, 0x7e88, dt.address); 7767 7768 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 7769 put_smstate(u16, buf, 0x7e70, seg.selector); 7770 put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8); 7771 put_smstate(u32, buf, 0x7e74, seg.limit); 7772 put_smstate(u64, buf, 0x7e78, seg.base); 7773 7774 kvm_x86_ops->get_gdt(vcpu, &dt); 7775 put_smstate(u32, buf, 0x7e64, dt.size); 7776 put_smstate(u64, buf, 0x7e68, dt.address); 7777 7778 for (i = 0; i < 6; i++) 7779 enter_smm_save_seg_64(vcpu, buf, i); 7780 } 7781 #endif 7782 7783 static void enter_smm(struct kvm_vcpu *vcpu) 7784 { 7785 struct kvm_segment cs, ds; 7786 struct desc_ptr dt; 7787 char buf[512]; 7788 u32 cr0; 7789 7790 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true); 7791 memset(buf, 0, 512); 7792 #ifdef CONFIG_X86_64 7793 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 7794 enter_smm_save_state_64(vcpu, buf); 7795 else 7796 #endif 7797 enter_smm_save_state_32(vcpu, buf); 7798 7799 /* 7800 * Give pre_enter_smm() a chance to make ISA-specific changes to the 7801 * vCPU state (e.g. leave guest mode) after we've saved the state into 7802 * the SMM state-save area. 7803 */ 7804 kvm_x86_ops->pre_enter_smm(vcpu, buf); 7805 7806 vcpu->arch.hflags |= HF_SMM_MASK; 7807 kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); 7808 7809 if (kvm_x86_ops->get_nmi_mask(vcpu)) 7810 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 7811 else 7812 kvm_x86_ops->set_nmi_mask(vcpu, true); 7813 7814 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); 7815 kvm_rip_write(vcpu, 0x8000); 7816 7817 cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); 7818 kvm_x86_ops->set_cr0(vcpu, cr0); 7819 vcpu->arch.cr0 = cr0; 7820 7821 kvm_x86_ops->set_cr4(vcpu, 0); 7822 7823 /* Undocumented: IDT limit is set to zero on entry to SMM. */ 7824 dt.address = dt.size = 0; 7825 kvm_x86_ops->set_idt(vcpu, &dt); 7826 7827 __kvm_set_dr(vcpu, 7, DR7_FIXED_1); 7828 7829 cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; 7830 cs.base = vcpu->arch.smbase; 7831 7832 ds.selector = 0; 7833 ds.base = 0; 7834 7835 cs.limit = ds.limit = 0xffffffff; 7836 cs.type = ds.type = 0x3; 7837 cs.dpl = ds.dpl = 0; 7838 cs.db = ds.db = 0; 7839 cs.s = ds.s = 1; 7840 cs.l = ds.l = 0; 7841 cs.g = ds.g = 1; 7842 cs.avl = ds.avl = 0; 7843 cs.present = ds.present = 1; 7844 cs.unusable = ds.unusable = 0; 7845 cs.padding = ds.padding = 0; 7846 7847 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 7848 kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); 7849 kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); 7850 kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); 7851 kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); 7852 kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); 7853 7854 #ifdef CONFIG_X86_64 7855 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 7856 kvm_x86_ops->set_efer(vcpu, 0); 7857 #endif 7858 7859 kvm_update_cpuid(vcpu); 7860 kvm_mmu_reset_context(vcpu); 7861 } 7862 7863 static void process_smi(struct kvm_vcpu *vcpu) 7864 { 7865 vcpu->arch.smi_pending = true; 7866 kvm_make_request(KVM_REQ_EVENT, vcpu); 7867 } 7868 7869 void kvm_make_scan_ioapic_request(struct kvm *kvm) 7870 { 7871 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); 7872 } 7873 7874 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu) 7875 { 7876 if (!kvm_apic_present(vcpu)) 7877 return; 7878 7879 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256); 7880 7881 if (irqchip_split(vcpu->kvm)) 7882 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors); 7883 else { 7884 if (vcpu->arch.apicv_active) 7885 kvm_x86_ops->sync_pir_to_irr(vcpu); 7886 if (ioapic_in_kernel(vcpu->kvm)) 7887 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors); 7888 } 7889 7890 if (is_guest_mode(vcpu)) 7891 vcpu->arch.load_eoi_exitmap_pending = true; 7892 else 7893 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); 7894 } 7895 7896 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu) 7897 { 7898 u64 eoi_exit_bitmap[4]; 7899 7900 if (!kvm_apic_hw_enabled(vcpu->arch.apic)) 7901 return; 7902 7903 bitmap_or((ulong *)eoi_exit_bitmap, vcpu->arch.ioapic_handled_vectors, 7904 vcpu_to_synic(vcpu)->vec_bitmap, 256); 7905 kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap); 7906 } 7907 7908 int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, 7909 unsigned long start, unsigned long end, 7910 bool blockable) 7911 { 7912 unsigned long apic_address; 7913 7914 /* 7915 * The physical address of apic access page is stored in the VMCS. 7916 * Update it when it becomes invalid. 7917 */ 7918 apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 7919 if (start <= apic_address && apic_address < end) 7920 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); 7921 7922 return 0; 7923 } 7924 7925 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) 7926 { 7927 struct page *page = NULL; 7928 7929 if (!lapic_in_kernel(vcpu)) 7930 return; 7931 7932 if (!kvm_x86_ops->set_apic_access_page_addr) 7933 return; 7934 7935 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 7936 if (is_error_page(page)) 7937 return; 7938 kvm_x86_ops->set_apic_access_page_addr(vcpu, page_to_phys(page)); 7939 7940 /* 7941 * Do not pin apic access page in memory, the MMU notifier 7942 * will call us again if it is migrated or swapped out. 7943 */ 7944 put_page(page); 7945 } 7946 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page); 7947 7948 void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu) 7949 { 7950 smp_send_reschedule(vcpu->cpu); 7951 } 7952 EXPORT_SYMBOL_GPL(__kvm_request_immediate_exit); 7953 7954 /* 7955 * Returns 1 to let vcpu_run() continue the guest execution loop without 7956 * exiting to the userspace. Otherwise, the value will be returned to the 7957 * userspace. 7958 */ 7959 static int vcpu_enter_guest(struct kvm_vcpu *vcpu) 7960 { 7961 int r; 7962 bool req_int_win = 7963 dm_request_for_irq_injection(vcpu) && 7964 kvm_cpu_accept_dm_intr(vcpu); 7965 7966 bool req_immediate_exit = false; 7967 7968 if (kvm_request_pending(vcpu)) { 7969 if (kvm_check_request(KVM_REQ_GET_VMCS12_PAGES, vcpu)) { 7970 if (unlikely(!kvm_x86_ops->get_vmcs12_pages(vcpu))) { 7971 r = 0; 7972 goto out; 7973 } 7974 } 7975 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) 7976 kvm_mmu_unload(vcpu); 7977 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu)) 7978 __kvm_migrate_timers(vcpu); 7979 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu)) 7980 kvm_gen_update_masterclock(vcpu->kvm); 7981 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu)) 7982 kvm_gen_kvmclock_update(vcpu); 7983 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) { 7984 r = kvm_guest_time_update(vcpu); 7985 if (unlikely(r)) 7986 goto out; 7987 } 7988 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) 7989 kvm_mmu_sync_roots(vcpu); 7990 if (kvm_check_request(KVM_REQ_LOAD_CR3, vcpu)) 7991 kvm_mmu_load_cr3(vcpu); 7992 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) 7993 kvm_vcpu_flush_tlb(vcpu, true); 7994 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { 7995 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; 7996 r = 0; 7997 goto out; 7998 } 7999 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { 8000 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; 8001 vcpu->mmio_needed = 0; 8002 r = 0; 8003 goto out; 8004 } 8005 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { 8006 /* Page is swapped out. Do synthetic halt */ 8007 vcpu->arch.apf.halted = true; 8008 r = 1; 8009 goto out; 8010 } 8011 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) 8012 record_steal_time(vcpu); 8013 if (kvm_check_request(KVM_REQ_SMI, vcpu)) 8014 process_smi(vcpu); 8015 if (kvm_check_request(KVM_REQ_NMI, vcpu)) 8016 process_nmi(vcpu); 8017 if (kvm_check_request(KVM_REQ_PMU, vcpu)) 8018 kvm_pmu_handle_event(vcpu); 8019 if (kvm_check_request(KVM_REQ_PMI, vcpu)) 8020 kvm_pmu_deliver_pmi(vcpu); 8021 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) { 8022 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255); 8023 if (test_bit(vcpu->arch.pending_ioapic_eoi, 8024 vcpu->arch.ioapic_handled_vectors)) { 8025 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI; 8026 vcpu->run->eoi.vector = 8027 vcpu->arch.pending_ioapic_eoi; 8028 r = 0; 8029 goto out; 8030 } 8031 } 8032 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu)) 8033 vcpu_scan_ioapic(vcpu); 8034 if (kvm_check_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu)) 8035 vcpu_load_eoi_exitmap(vcpu); 8036 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu)) 8037 kvm_vcpu_reload_apic_access_page(vcpu); 8038 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) { 8039 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 8040 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH; 8041 r = 0; 8042 goto out; 8043 } 8044 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) { 8045 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 8046 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET; 8047 r = 0; 8048 goto out; 8049 } 8050 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) { 8051 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 8052 vcpu->run->hyperv = vcpu->arch.hyperv.exit; 8053 r = 0; 8054 goto out; 8055 } 8056 8057 /* 8058 * KVM_REQ_HV_STIMER has to be processed after 8059 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers 8060 * depend on the guest clock being up-to-date 8061 */ 8062 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu)) 8063 kvm_hv_process_stimers(vcpu); 8064 } 8065 8066 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) { 8067 ++vcpu->stat.req_event; 8068 kvm_apic_accept_events(vcpu); 8069 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { 8070 r = 1; 8071 goto out; 8072 } 8073 8074 if (inject_pending_event(vcpu, req_int_win) != 0) 8075 req_immediate_exit = true; 8076 else { 8077 /* Enable SMI/NMI/IRQ window open exits if needed. 8078 * 8079 * SMIs have three cases: 8080 * 1) They can be nested, and then there is nothing to 8081 * do here because RSM will cause a vmexit anyway. 8082 * 2) There is an ISA-specific reason why SMI cannot be 8083 * injected, and the moment when this changes can be 8084 * intercepted. 8085 * 3) Or the SMI can be pending because 8086 * inject_pending_event has completed the injection 8087 * of an IRQ or NMI from the previous vmexit, and 8088 * then we request an immediate exit to inject the 8089 * SMI. 8090 */ 8091 if (vcpu->arch.smi_pending && !is_smm(vcpu)) 8092 if (!kvm_x86_ops->enable_smi_window(vcpu)) 8093 req_immediate_exit = true; 8094 if (vcpu->arch.nmi_pending) 8095 kvm_x86_ops->enable_nmi_window(vcpu); 8096 if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win) 8097 kvm_x86_ops->enable_irq_window(vcpu); 8098 WARN_ON(vcpu->arch.exception.pending); 8099 } 8100 8101 if (kvm_lapic_enabled(vcpu)) { 8102 update_cr8_intercept(vcpu); 8103 kvm_lapic_sync_to_vapic(vcpu); 8104 } 8105 } 8106 8107 r = kvm_mmu_reload(vcpu); 8108 if (unlikely(r)) { 8109 goto cancel_injection; 8110 } 8111 8112 preempt_disable(); 8113 8114 kvm_x86_ops->prepare_guest_switch(vcpu); 8115 8116 /* 8117 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt 8118 * IPI are then delayed after guest entry, which ensures that they 8119 * result in virtual interrupt delivery. 8120 */ 8121 local_irq_disable(); 8122 vcpu->mode = IN_GUEST_MODE; 8123 8124 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 8125 8126 /* 8127 * 1) We should set ->mode before checking ->requests. Please see 8128 * the comment in kvm_vcpu_exiting_guest_mode(). 8129 * 8130 * 2) For APICv, we should set ->mode before checking PID.ON. This 8131 * pairs with the memory barrier implicit in pi_test_and_set_on 8132 * (see vmx_deliver_posted_interrupt). 8133 * 8134 * 3) This also orders the write to mode from any reads to the page 8135 * tables done while the VCPU is running. Please see the comment 8136 * in kvm_flush_remote_tlbs. 8137 */ 8138 smp_mb__after_srcu_read_unlock(); 8139 8140 /* 8141 * This handles the case where a posted interrupt was 8142 * notified with kvm_vcpu_kick. 8143 */ 8144 if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active) 8145 kvm_x86_ops->sync_pir_to_irr(vcpu); 8146 8147 if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) 8148 || need_resched() || signal_pending(current)) { 8149 vcpu->mode = OUTSIDE_GUEST_MODE; 8150 smp_wmb(); 8151 local_irq_enable(); 8152 preempt_enable(); 8153 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 8154 r = 1; 8155 goto cancel_injection; 8156 } 8157 8158 if (req_immediate_exit) { 8159 kvm_make_request(KVM_REQ_EVENT, vcpu); 8160 kvm_x86_ops->request_immediate_exit(vcpu); 8161 } 8162 8163 trace_kvm_entry(vcpu->vcpu_id); 8164 guest_enter_irqoff(); 8165 8166 /* The preempt notifier should have taken care of the FPU already. */ 8167 WARN_ON_ONCE(test_thread_flag(TIF_NEED_FPU_LOAD)); 8168 8169 if (unlikely(vcpu->arch.switch_db_regs)) { 8170 set_debugreg(0, 7); 8171 set_debugreg(vcpu->arch.eff_db[0], 0); 8172 set_debugreg(vcpu->arch.eff_db[1], 1); 8173 set_debugreg(vcpu->arch.eff_db[2], 2); 8174 set_debugreg(vcpu->arch.eff_db[3], 3); 8175 set_debugreg(vcpu->arch.dr6, 6); 8176 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 8177 } 8178 8179 kvm_x86_ops->run(vcpu); 8180 8181 /* 8182 * Do this here before restoring debug registers on the host. And 8183 * since we do this before handling the vmexit, a DR access vmexit 8184 * can (a) read the correct value of the debug registers, (b) set 8185 * KVM_DEBUGREG_WONT_EXIT again. 8186 */ 8187 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) { 8188 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP); 8189 kvm_x86_ops->sync_dirty_debug_regs(vcpu); 8190 kvm_update_dr0123(vcpu); 8191 kvm_update_dr6(vcpu); 8192 kvm_update_dr7(vcpu); 8193 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 8194 } 8195 8196 /* 8197 * If the guest has used debug registers, at least dr7 8198 * will be disabled while returning to the host. 8199 * If we don't have active breakpoints in the host, we don't 8200 * care about the messed up debug address registers. But if 8201 * we have some of them active, restore the old state. 8202 */ 8203 if (hw_breakpoint_active()) 8204 hw_breakpoint_restore(); 8205 8206 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); 8207 8208 vcpu->mode = OUTSIDE_GUEST_MODE; 8209 smp_wmb(); 8210 8211 kvm_x86_ops->handle_exit_irqoff(vcpu); 8212 8213 /* 8214 * Consume any pending interrupts, including the possible source of 8215 * VM-Exit on SVM and any ticks that occur between VM-Exit and now. 8216 * An instruction is required after local_irq_enable() to fully unblock 8217 * interrupts on processors that implement an interrupt shadow, the 8218 * stat.exits increment will do nicely. 8219 */ 8220 kvm_before_interrupt(vcpu); 8221 local_irq_enable(); 8222 ++vcpu->stat.exits; 8223 local_irq_disable(); 8224 kvm_after_interrupt(vcpu); 8225 8226 guest_exit_irqoff(); 8227 if (lapic_in_kernel(vcpu)) { 8228 s64 delta = vcpu->arch.apic->lapic_timer.advance_expire_delta; 8229 if (delta != S64_MIN) { 8230 trace_kvm_wait_lapic_expire(vcpu->vcpu_id, delta); 8231 vcpu->arch.apic->lapic_timer.advance_expire_delta = S64_MIN; 8232 } 8233 } 8234 8235 local_irq_enable(); 8236 preempt_enable(); 8237 8238 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 8239 8240 /* 8241 * Profile KVM exit RIPs: 8242 */ 8243 if (unlikely(prof_on == KVM_PROFILING)) { 8244 unsigned long rip = kvm_rip_read(vcpu); 8245 profile_hit(KVM_PROFILING, (void *)rip); 8246 } 8247 8248 if (unlikely(vcpu->arch.tsc_always_catchup)) 8249 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 8250 8251 if (vcpu->arch.apic_attention) 8252 kvm_lapic_sync_from_vapic(vcpu); 8253 8254 vcpu->arch.gpa_available = false; 8255 r = kvm_x86_ops->handle_exit(vcpu); 8256 return r; 8257 8258 cancel_injection: 8259 kvm_x86_ops->cancel_injection(vcpu); 8260 if (unlikely(vcpu->arch.apic_attention)) 8261 kvm_lapic_sync_from_vapic(vcpu); 8262 out: 8263 return r; 8264 } 8265 8266 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) 8267 { 8268 if (!kvm_arch_vcpu_runnable(vcpu) && 8269 (!kvm_x86_ops->pre_block || kvm_x86_ops->pre_block(vcpu) == 0)) { 8270 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 8271 kvm_vcpu_block(vcpu); 8272 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 8273 8274 if (kvm_x86_ops->post_block) 8275 kvm_x86_ops->post_block(vcpu); 8276 8277 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu)) 8278 return 1; 8279 } 8280 8281 kvm_apic_accept_events(vcpu); 8282 switch(vcpu->arch.mp_state) { 8283 case KVM_MP_STATE_HALTED: 8284 vcpu->arch.pv.pv_unhalted = false; 8285 vcpu->arch.mp_state = 8286 KVM_MP_STATE_RUNNABLE; 8287 /* fall through */ 8288 case KVM_MP_STATE_RUNNABLE: 8289 vcpu->arch.apf.halted = false; 8290 break; 8291 case KVM_MP_STATE_INIT_RECEIVED: 8292 break; 8293 default: 8294 return -EINTR; 8295 break; 8296 } 8297 return 1; 8298 } 8299 8300 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu) 8301 { 8302 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) 8303 kvm_x86_ops->check_nested_events(vcpu, false); 8304 8305 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && 8306 !vcpu->arch.apf.halted); 8307 } 8308 8309 static int vcpu_run(struct kvm_vcpu *vcpu) 8310 { 8311 int r; 8312 struct kvm *kvm = vcpu->kvm; 8313 8314 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 8315 vcpu->arch.l1tf_flush_l1d = true; 8316 8317 for (;;) { 8318 if (kvm_vcpu_running(vcpu)) { 8319 r = vcpu_enter_guest(vcpu); 8320 } else { 8321 r = vcpu_block(kvm, vcpu); 8322 } 8323 8324 if (r <= 0) 8325 break; 8326 8327 kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu); 8328 if (kvm_cpu_has_pending_timer(vcpu)) 8329 kvm_inject_pending_timer_irqs(vcpu); 8330 8331 if (dm_request_for_irq_injection(vcpu) && 8332 kvm_vcpu_ready_for_interrupt_injection(vcpu)) { 8333 r = 0; 8334 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; 8335 ++vcpu->stat.request_irq_exits; 8336 break; 8337 } 8338 8339 kvm_check_async_pf_completion(vcpu); 8340 8341 if (signal_pending(current)) { 8342 r = -EINTR; 8343 vcpu->run->exit_reason = KVM_EXIT_INTR; 8344 ++vcpu->stat.signal_exits; 8345 break; 8346 } 8347 if (need_resched()) { 8348 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 8349 cond_resched(); 8350 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 8351 } 8352 } 8353 8354 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 8355 8356 return r; 8357 } 8358 8359 static inline int complete_emulated_io(struct kvm_vcpu *vcpu) 8360 { 8361 int r; 8362 8363 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 8364 r = kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE); 8365 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 8366 return r; 8367 } 8368 8369 static int complete_emulated_pio(struct kvm_vcpu *vcpu) 8370 { 8371 BUG_ON(!vcpu->arch.pio.count); 8372 8373 return complete_emulated_io(vcpu); 8374 } 8375 8376 /* 8377 * Implements the following, as a state machine: 8378 * 8379 * read: 8380 * for each fragment 8381 * for each mmio piece in the fragment 8382 * write gpa, len 8383 * exit 8384 * copy data 8385 * execute insn 8386 * 8387 * write: 8388 * for each fragment 8389 * for each mmio piece in the fragment 8390 * write gpa, len 8391 * copy data 8392 * exit 8393 */ 8394 static int complete_emulated_mmio(struct kvm_vcpu *vcpu) 8395 { 8396 struct kvm_run *run = vcpu->run; 8397 struct kvm_mmio_fragment *frag; 8398 unsigned len; 8399 8400 BUG_ON(!vcpu->mmio_needed); 8401 8402 /* Complete previous fragment */ 8403 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment]; 8404 len = min(8u, frag->len); 8405 if (!vcpu->mmio_is_write) 8406 memcpy(frag->data, run->mmio.data, len); 8407 8408 if (frag->len <= 8) { 8409 /* Switch to the next fragment. */ 8410 frag++; 8411 vcpu->mmio_cur_fragment++; 8412 } else { 8413 /* Go forward to the next mmio piece. */ 8414 frag->data += len; 8415 frag->gpa += len; 8416 frag->len -= len; 8417 } 8418 8419 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) { 8420 vcpu->mmio_needed = 0; 8421 8422 /* FIXME: return into emulator if single-stepping. */ 8423 if (vcpu->mmio_is_write) 8424 return 1; 8425 vcpu->mmio_read_completed = 1; 8426 return complete_emulated_io(vcpu); 8427 } 8428 8429 run->exit_reason = KVM_EXIT_MMIO; 8430 run->mmio.phys_addr = frag->gpa; 8431 if (vcpu->mmio_is_write) 8432 memcpy(run->mmio.data, frag->data, min(8u, frag->len)); 8433 run->mmio.len = min(8u, frag->len); 8434 run->mmio.is_write = vcpu->mmio_is_write; 8435 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 8436 return 0; 8437 } 8438 8439 /* Swap (qemu) user FPU context for the guest FPU context. */ 8440 static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) 8441 { 8442 fpregs_lock(); 8443 8444 copy_fpregs_to_fpstate(vcpu->arch.user_fpu); 8445 /* PKRU is separately restored in kvm_x86_ops->run. */ 8446 __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state, 8447 ~XFEATURE_MASK_PKRU); 8448 8449 fpregs_mark_activate(); 8450 fpregs_unlock(); 8451 8452 trace_kvm_fpu(1); 8453 } 8454 8455 /* When vcpu_run ends, restore user space FPU context. */ 8456 static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) 8457 { 8458 fpregs_lock(); 8459 8460 copy_fpregs_to_fpstate(vcpu->arch.guest_fpu); 8461 copy_kernel_to_fpregs(&vcpu->arch.user_fpu->state); 8462 8463 fpregs_mark_activate(); 8464 fpregs_unlock(); 8465 8466 ++vcpu->stat.fpu_reload; 8467 trace_kvm_fpu(0); 8468 } 8469 8470 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 8471 { 8472 int r; 8473 8474 vcpu_load(vcpu); 8475 kvm_sigset_activate(vcpu); 8476 kvm_load_guest_fpu(vcpu); 8477 8478 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { 8479 if (kvm_run->immediate_exit) { 8480 r = -EINTR; 8481 goto out; 8482 } 8483 kvm_vcpu_block(vcpu); 8484 kvm_apic_accept_events(vcpu); 8485 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 8486 r = -EAGAIN; 8487 if (signal_pending(current)) { 8488 r = -EINTR; 8489 vcpu->run->exit_reason = KVM_EXIT_INTR; 8490 ++vcpu->stat.signal_exits; 8491 } 8492 goto out; 8493 } 8494 8495 if (vcpu->run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { 8496 r = -EINVAL; 8497 goto out; 8498 } 8499 8500 if (vcpu->run->kvm_dirty_regs) { 8501 r = sync_regs(vcpu); 8502 if (r != 0) 8503 goto out; 8504 } 8505 8506 /* re-sync apic's tpr */ 8507 if (!lapic_in_kernel(vcpu)) { 8508 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) { 8509 r = -EINVAL; 8510 goto out; 8511 } 8512 } 8513 8514 if (unlikely(vcpu->arch.complete_userspace_io)) { 8515 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; 8516 vcpu->arch.complete_userspace_io = NULL; 8517 r = cui(vcpu); 8518 if (r <= 0) 8519 goto out; 8520 } else 8521 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); 8522 8523 if (kvm_run->immediate_exit) 8524 r = -EINTR; 8525 else 8526 r = vcpu_run(vcpu); 8527 8528 out: 8529 kvm_put_guest_fpu(vcpu); 8530 if (vcpu->run->kvm_valid_regs) 8531 store_regs(vcpu); 8532 post_kvm_run_save(vcpu); 8533 kvm_sigset_deactivate(vcpu); 8534 8535 vcpu_put(vcpu); 8536 return r; 8537 } 8538 8539 static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 8540 { 8541 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) { 8542 /* 8543 * We are here if userspace calls get_regs() in the middle of 8544 * instruction emulation. Registers state needs to be copied 8545 * back from emulation context to vcpu. Userspace shouldn't do 8546 * that usually, but some bad designed PV devices (vmware 8547 * backdoor interface) need this to work 8548 */ 8549 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt); 8550 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 8551 } 8552 regs->rax = kvm_rax_read(vcpu); 8553 regs->rbx = kvm_rbx_read(vcpu); 8554 regs->rcx = kvm_rcx_read(vcpu); 8555 regs->rdx = kvm_rdx_read(vcpu); 8556 regs->rsi = kvm_rsi_read(vcpu); 8557 regs->rdi = kvm_rdi_read(vcpu); 8558 regs->rsp = kvm_rsp_read(vcpu); 8559 regs->rbp = kvm_rbp_read(vcpu); 8560 #ifdef CONFIG_X86_64 8561 regs->r8 = kvm_r8_read(vcpu); 8562 regs->r9 = kvm_r9_read(vcpu); 8563 regs->r10 = kvm_r10_read(vcpu); 8564 regs->r11 = kvm_r11_read(vcpu); 8565 regs->r12 = kvm_r12_read(vcpu); 8566 regs->r13 = kvm_r13_read(vcpu); 8567 regs->r14 = kvm_r14_read(vcpu); 8568 regs->r15 = kvm_r15_read(vcpu); 8569 #endif 8570 8571 regs->rip = kvm_rip_read(vcpu); 8572 regs->rflags = kvm_get_rflags(vcpu); 8573 } 8574 8575 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 8576 { 8577 vcpu_load(vcpu); 8578 __get_regs(vcpu, regs); 8579 vcpu_put(vcpu); 8580 return 0; 8581 } 8582 8583 static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 8584 { 8585 vcpu->arch.emulate_regs_need_sync_from_vcpu = true; 8586 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 8587 8588 kvm_rax_write(vcpu, regs->rax); 8589 kvm_rbx_write(vcpu, regs->rbx); 8590 kvm_rcx_write(vcpu, regs->rcx); 8591 kvm_rdx_write(vcpu, regs->rdx); 8592 kvm_rsi_write(vcpu, regs->rsi); 8593 kvm_rdi_write(vcpu, regs->rdi); 8594 kvm_rsp_write(vcpu, regs->rsp); 8595 kvm_rbp_write(vcpu, regs->rbp); 8596 #ifdef CONFIG_X86_64 8597 kvm_r8_write(vcpu, regs->r8); 8598 kvm_r9_write(vcpu, regs->r9); 8599 kvm_r10_write(vcpu, regs->r10); 8600 kvm_r11_write(vcpu, regs->r11); 8601 kvm_r12_write(vcpu, regs->r12); 8602 kvm_r13_write(vcpu, regs->r13); 8603 kvm_r14_write(vcpu, regs->r14); 8604 kvm_r15_write(vcpu, regs->r15); 8605 #endif 8606 8607 kvm_rip_write(vcpu, regs->rip); 8608 kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED); 8609 8610 vcpu->arch.exception.pending = false; 8611 8612 kvm_make_request(KVM_REQ_EVENT, vcpu); 8613 } 8614 8615 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 8616 { 8617 vcpu_load(vcpu); 8618 __set_regs(vcpu, regs); 8619 vcpu_put(vcpu); 8620 return 0; 8621 } 8622 8623 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) 8624 { 8625 struct kvm_segment cs; 8626 8627 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 8628 *db = cs.db; 8629 *l = cs.l; 8630 } 8631 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); 8632 8633 static void __get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 8634 { 8635 struct desc_ptr dt; 8636 8637 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 8638 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 8639 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); 8640 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 8641 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 8642 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 8643 8644 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 8645 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 8646 8647 kvm_x86_ops->get_idt(vcpu, &dt); 8648 sregs->idt.limit = dt.size; 8649 sregs->idt.base = dt.address; 8650 kvm_x86_ops->get_gdt(vcpu, &dt); 8651 sregs->gdt.limit = dt.size; 8652 sregs->gdt.base = dt.address; 8653 8654 sregs->cr0 = kvm_read_cr0(vcpu); 8655 sregs->cr2 = vcpu->arch.cr2; 8656 sregs->cr3 = kvm_read_cr3(vcpu); 8657 sregs->cr4 = kvm_read_cr4(vcpu); 8658 sregs->cr8 = kvm_get_cr8(vcpu); 8659 sregs->efer = vcpu->arch.efer; 8660 sregs->apic_base = kvm_get_apic_base(vcpu); 8661 8662 memset(sregs->interrupt_bitmap, 0, sizeof(sregs->interrupt_bitmap)); 8663 8664 if (vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft) 8665 set_bit(vcpu->arch.interrupt.nr, 8666 (unsigned long *)sregs->interrupt_bitmap); 8667 } 8668 8669 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 8670 struct kvm_sregs *sregs) 8671 { 8672 vcpu_load(vcpu); 8673 __get_sregs(vcpu, sregs); 8674 vcpu_put(vcpu); 8675 return 0; 8676 } 8677 8678 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 8679 struct kvm_mp_state *mp_state) 8680 { 8681 vcpu_load(vcpu); 8682 8683 kvm_apic_accept_events(vcpu); 8684 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED && 8685 vcpu->arch.pv.pv_unhalted) 8686 mp_state->mp_state = KVM_MP_STATE_RUNNABLE; 8687 else 8688 mp_state->mp_state = vcpu->arch.mp_state; 8689 8690 vcpu_put(vcpu); 8691 return 0; 8692 } 8693 8694 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 8695 struct kvm_mp_state *mp_state) 8696 { 8697 int ret = -EINVAL; 8698 8699 vcpu_load(vcpu); 8700 8701 if (!lapic_in_kernel(vcpu) && 8702 mp_state->mp_state != KVM_MP_STATE_RUNNABLE) 8703 goto out; 8704 8705 /* INITs are latched while in SMM */ 8706 if ((is_smm(vcpu) || vcpu->arch.smi_pending) && 8707 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED || 8708 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED)) 8709 goto out; 8710 8711 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) { 8712 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; 8713 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events); 8714 } else 8715 vcpu->arch.mp_state = mp_state->mp_state; 8716 kvm_make_request(KVM_REQ_EVENT, vcpu); 8717 8718 ret = 0; 8719 out: 8720 vcpu_put(vcpu); 8721 return ret; 8722 } 8723 8724 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, 8725 int reason, bool has_error_code, u32 error_code) 8726 { 8727 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 8728 int ret; 8729 8730 init_emulate_ctxt(vcpu); 8731 8732 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason, 8733 has_error_code, error_code); 8734 if (ret) { 8735 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 8736 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 8737 vcpu->run->internal.ndata = 0; 8738 return 0; 8739 } 8740 8741 kvm_rip_write(vcpu, ctxt->eip); 8742 kvm_set_rflags(vcpu, ctxt->eflags); 8743 kvm_make_request(KVM_REQ_EVENT, vcpu); 8744 return 1; 8745 } 8746 EXPORT_SYMBOL_GPL(kvm_task_switch); 8747 8748 static int kvm_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 8749 { 8750 if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) { 8751 /* 8752 * When EFER.LME and CR0.PG are set, the processor is in 8753 * 64-bit mode (though maybe in a 32-bit code segment). 8754 * CR4.PAE and EFER.LMA must be set. 8755 */ 8756 if (!(sregs->cr4 & X86_CR4_PAE) 8757 || !(sregs->efer & EFER_LMA)) 8758 return -EINVAL; 8759 } else { 8760 /* 8761 * Not in 64-bit mode: EFER.LMA is clear and the code 8762 * segment cannot be 64-bit. 8763 */ 8764 if (sregs->efer & EFER_LMA || sregs->cs.l) 8765 return -EINVAL; 8766 } 8767 8768 return kvm_valid_cr4(vcpu, sregs->cr4); 8769 } 8770 8771 static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 8772 { 8773 struct msr_data apic_base_msr; 8774 int mmu_reset_needed = 0; 8775 int cpuid_update_needed = 0; 8776 int pending_vec, max_bits, idx; 8777 struct desc_ptr dt; 8778 int ret = -EINVAL; 8779 8780 if (kvm_valid_sregs(vcpu, sregs)) 8781 goto out; 8782 8783 apic_base_msr.data = sregs->apic_base; 8784 apic_base_msr.host_initiated = true; 8785 if (kvm_set_apic_base(vcpu, &apic_base_msr)) 8786 goto out; 8787 8788 dt.size = sregs->idt.limit; 8789 dt.address = sregs->idt.base; 8790 kvm_x86_ops->set_idt(vcpu, &dt); 8791 dt.size = sregs->gdt.limit; 8792 dt.address = sregs->gdt.base; 8793 kvm_x86_ops->set_gdt(vcpu, &dt); 8794 8795 vcpu->arch.cr2 = sregs->cr2; 8796 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3; 8797 vcpu->arch.cr3 = sregs->cr3; 8798 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 8799 8800 kvm_set_cr8(vcpu, sregs->cr8); 8801 8802 mmu_reset_needed |= vcpu->arch.efer != sregs->efer; 8803 kvm_x86_ops->set_efer(vcpu, sregs->efer); 8804 8805 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; 8806 kvm_x86_ops->set_cr0(vcpu, sregs->cr0); 8807 vcpu->arch.cr0 = sregs->cr0; 8808 8809 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; 8810 cpuid_update_needed |= ((kvm_read_cr4(vcpu) ^ sregs->cr4) & 8811 (X86_CR4_OSXSAVE | X86_CR4_PKE)); 8812 kvm_x86_ops->set_cr4(vcpu, sregs->cr4); 8813 if (cpuid_update_needed) 8814 kvm_update_cpuid(vcpu); 8815 8816 idx = srcu_read_lock(&vcpu->kvm->srcu); 8817 if (is_pae_paging(vcpu)) { 8818 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); 8819 mmu_reset_needed = 1; 8820 } 8821 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8822 8823 if (mmu_reset_needed) 8824 kvm_mmu_reset_context(vcpu); 8825 8826 max_bits = KVM_NR_INTERRUPTS; 8827 pending_vec = find_first_bit( 8828 (const unsigned long *)sregs->interrupt_bitmap, max_bits); 8829 if (pending_vec < max_bits) { 8830 kvm_queue_interrupt(vcpu, pending_vec, false); 8831 pr_debug("Set back pending irq %d\n", pending_vec); 8832 } 8833 8834 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 8835 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 8836 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); 8837 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 8838 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 8839 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 8840 8841 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 8842 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 8843 8844 update_cr8_intercept(vcpu); 8845 8846 /* Older userspace won't unhalt the vcpu on reset. */ 8847 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && 8848 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && 8849 !is_protmode(vcpu)) 8850 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 8851 8852 kvm_make_request(KVM_REQ_EVENT, vcpu); 8853 8854 ret = 0; 8855 out: 8856 return ret; 8857 } 8858 8859 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 8860 struct kvm_sregs *sregs) 8861 { 8862 int ret; 8863 8864 vcpu_load(vcpu); 8865 ret = __set_sregs(vcpu, sregs); 8866 vcpu_put(vcpu); 8867 return ret; 8868 } 8869 8870 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 8871 struct kvm_guest_debug *dbg) 8872 { 8873 unsigned long rflags; 8874 int i, r; 8875 8876 vcpu_load(vcpu); 8877 8878 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { 8879 r = -EBUSY; 8880 if (vcpu->arch.exception.pending) 8881 goto out; 8882 if (dbg->control & KVM_GUESTDBG_INJECT_DB) 8883 kvm_queue_exception(vcpu, DB_VECTOR); 8884 else 8885 kvm_queue_exception(vcpu, BP_VECTOR); 8886 } 8887 8888 /* 8889 * Read rflags as long as potentially injected trace flags are still 8890 * filtered out. 8891 */ 8892 rflags = kvm_get_rflags(vcpu); 8893 8894 vcpu->guest_debug = dbg->control; 8895 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) 8896 vcpu->guest_debug = 0; 8897 8898 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { 8899 for (i = 0; i < KVM_NR_DB_REGS; ++i) 8900 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; 8901 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; 8902 } else { 8903 for (i = 0; i < KVM_NR_DB_REGS; i++) 8904 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 8905 } 8906 kvm_update_dr7(vcpu); 8907 8908 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 8909 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + 8910 get_segment_base(vcpu, VCPU_SREG_CS); 8911 8912 /* 8913 * Trigger an rflags update that will inject or remove the trace 8914 * flags. 8915 */ 8916 kvm_set_rflags(vcpu, rflags); 8917 8918 kvm_x86_ops->update_bp_intercept(vcpu); 8919 8920 r = 0; 8921 8922 out: 8923 vcpu_put(vcpu); 8924 return r; 8925 } 8926 8927 /* 8928 * Translate a guest virtual address to a guest physical address. 8929 */ 8930 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 8931 struct kvm_translation *tr) 8932 { 8933 unsigned long vaddr = tr->linear_address; 8934 gpa_t gpa; 8935 int idx; 8936 8937 vcpu_load(vcpu); 8938 8939 idx = srcu_read_lock(&vcpu->kvm->srcu); 8940 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); 8941 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8942 tr->physical_address = gpa; 8943 tr->valid = gpa != UNMAPPED_GVA; 8944 tr->writeable = 1; 8945 tr->usermode = 0; 8946 8947 vcpu_put(vcpu); 8948 return 0; 8949 } 8950 8951 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 8952 { 8953 struct fxregs_state *fxsave; 8954 8955 vcpu_load(vcpu); 8956 8957 fxsave = &vcpu->arch.guest_fpu->state.fxsave; 8958 memcpy(fpu->fpr, fxsave->st_space, 128); 8959 fpu->fcw = fxsave->cwd; 8960 fpu->fsw = fxsave->swd; 8961 fpu->ftwx = fxsave->twd; 8962 fpu->last_opcode = fxsave->fop; 8963 fpu->last_ip = fxsave->rip; 8964 fpu->last_dp = fxsave->rdp; 8965 memcpy(fpu->xmm, fxsave->xmm_space, sizeof(fxsave->xmm_space)); 8966 8967 vcpu_put(vcpu); 8968 return 0; 8969 } 8970 8971 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 8972 { 8973 struct fxregs_state *fxsave; 8974 8975 vcpu_load(vcpu); 8976 8977 fxsave = &vcpu->arch.guest_fpu->state.fxsave; 8978 8979 memcpy(fxsave->st_space, fpu->fpr, 128); 8980 fxsave->cwd = fpu->fcw; 8981 fxsave->swd = fpu->fsw; 8982 fxsave->twd = fpu->ftwx; 8983 fxsave->fop = fpu->last_opcode; 8984 fxsave->rip = fpu->last_ip; 8985 fxsave->rdp = fpu->last_dp; 8986 memcpy(fxsave->xmm_space, fpu->xmm, sizeof(fxsave->xmm_space)); 8987 8988 vcpu_put(vcpu); 8989 return 0; 8990 } 8991 8992 static void store_regs(struct kvm_vcpu *vcpu) 8993 { 8994 BUILD_BUG_ON(sizeof(struct kvm_sync_regs) > SYNC_REGS_SIZE_BYTES); 8995 8996 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_REGS) 8997 __get_regs(vcpu, &vcpu->run->s.regs.regs); 8998 8999 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_SREGS) 9000 __get_sregs(vcpu, &vcpu->run->s.regs.sregs); 9001 9002 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_EVENTS) 9003 kvm_vcpu_ioctl_x86_get_vcpu_events( 9004 vcpu, &vcpu->run->s.regs.events); 9005 } 9006 9007 static int sync_regs(struct kvm_vcpu *vcpu) 9008 { 9009 if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS) 9010 return -EINVAL; 9011 9012 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) { 9013 __set_regs(vcpu, &vcpu->run->s.regs.regs); 9014 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS; 9015 } 9016 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_SREGS) { 9017 if (__set_sregs(vcpu, &vcpu->run->s.regs.sregs)) 9018 return -EINVAL; 9019 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_SREGS; 9020 } 9021 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_EVENTS) { 9022 if (kvm_vcpu_ioctl_x86_set_vcpu_events( 9023 vcpu, &vcpu->run->s.regs.events)) 9024 return -EINVAL; 9025 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_EVENTS; 9026 } 9027 9028 return 0; 9029 } 9030 9031 static void fx_init(struct kvm_vcpu *vcpu) 9032 { 9033 fpstate_init(&vcpu->arch.guest_fpu->state); 9034 if (boot_cpu_has(X86_FEATURE_XSAVES)) 9035 vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv = 9036 host_xcr0 | XSTATE_COMPACTION_ENABLED; 9037 9038 /* 9039 * Ensure guest xcr0 is valid for loading 9040 */ 9041 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 9042 9043 vcpu->arch.cr0 |= X86_CR0_ET; 9044 } 9045 9046 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 9047 { 9048 void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask; 9049 9050 kvmclock_reset(vcpu); 9051 9052 kvm_x86_ops->vcpu_free(vcpu); 9053 free_cpumask_var(wbinvd_dirty_mask); 9054 } 9055 9056 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 9057 unsigned int id) 9058 { 9059 struct kvm_vcpu *vcpu; 9060 9061 if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) 9062 printk_once(KERN_WARNING 9063 "kvm: SMP vm created on host with unstable TSC; " 9064 "guest TSC will not be reliable\n"); 9065 9066 vcpu = kvm_x86_ops->vcpu_create(kvm, id); 9067 9068 return vcpu; 9069 } 9070 9071 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 9072 { 9073 vcpu->arch.arch_capabilities = kvm_get_arch_capabilities(); 9074 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT; 9075 kvm_vcpu_mtrr_init(vcpu); 9076 vcpu_load(vcpu); 9077 kvm_vcpu_reset(vcpu, false); 9078 kvm_init_mmu(vcpu, false); 9079 vcpu_put(vcpu); 9080 return 0; 9081 } 9082 9083 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 9084 { 9085 struct msr_data msr; 9086 struct kvm *kvm = vcpu->kvm; 9087 9088 kvm_hv_vcpu_postcreate(vcpu); 9089 9090 if (mutex_lock_killable(&vcpu->mutex)) 9091 return; 9092 vcpu_load(vcpu); 9093 msr.data = 0x0; 9094 msr.index = MSR_IA32_TSC; 9095 msr.host_initiated = true; 9096 kvm_write_tsc(vcpu, &msr); 9097 vcpu_put(vcpu); 9098 9099 /* poll control enabled by default */ 9100 vcpu->arch.msr_kvm_poll_control = 1; 9101 9102 mutex_unlock(&vcpu->mutex); 9103 9104 if (!kvmclock_periodic_sync) 9105 return; 9106 9107 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 9108 KVMCLOCK_SYNC_PERIOD); 9109 } 9110 9111 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 9112 { 9113 vcpu->arch.apf.msr_val = 0; 9114 9115 vcpu_load(vcpu); 9116 kvm_mmu_unload(vcpu); 9117 vcpu_put(vcpu); 9118 9119 kvm_x86_ops->vcpu_free(vcpu); 9120 } 9121 9122 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) 9123 { 9124 kvm_lapic_reset(vcpu, init_event); 9125 9126 vcpu->arch.hflags = 0; 9127 9128 vcpu->arch.smi_pending = 0; 9129 vcpu->arch.smi_count = 0; 9130 atomic_set(&vcpu->arch.nmi_queued, 0); 9131 vcpu->arch.nmi_pending = 0; 9132 vcpu->arch.nmi_injected = false; 9133 kvm_clear_interrupt_queue(vcpu); 9134 kvm_clear_exception_queue(vcpu); 9135 vcpu->arch.exception.pending = false; 9136 9137 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); 9138 kvm_update_dr0123(vcpu); 9139 vcpu->arch.dr6 = DR6_INIT; 9140 kvm_update_dr6(vcpu); 9141 vcpu->arch.dr7 = DR7_FIXED_1; 9142 kvm_update_dr7(vcpu); 9143 9144 vcpu->arch.cr2 = 0; 9145 9146 kvm_make_request(KVM_REQ_EVENT, vcpu); 9147 vcpu->arch.apf.msr_val = 0; 9148 vcpu->arch.st.msr_val = 0; 9149 9150 kvmclock_reset(vcpu); 9151 9152 kvm_clear_async_pf_completion_queue(vcpu); 9153 kvm_async_pf_hash_reset(vcpu); 9154 vcpu->arch.apf.halted = false; 9155 9156 if (kvm_mpx_supported()) { 9157 void *mpx_state_buffer; 9158 9159 /* 9160 * To avoid have the INIT path from kvm_apic_has_events() that be 9161 * called with loaded FPU and does not let userspace fix the state. 9162 */ 9163 if (init_event) 9164 kvm_put_guest_fpu(vcpu); 9165 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, 9166 XFEATURE_BNDREGS); 9167 if (mpx_state_buffer) 9168 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state)); 9169 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, 9170 XFEATURE_BNDCSR); 9171 if (mpx_state_buffer) 9172 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr)); 9173 if (init_event) 9174 kvm_load_guest_fpu(vcpu); 9175 } 9176 9177 if (!init_event) { 9178 kvm_pmu_reset(vcpu); 9179 vcpu->arch.smbase = 0x30000; 9180 9181 vcpu->arch.msr_misc_features_enables = 0; 9182 9183 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 9184 } 9185 9186 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); 9187 vcpu->arch.regs_avail = ~0; 9188 vcpu->arch.regs_dirty = ~0; 9189 9190 vcpu->arch.ia32_xss = 0; 9191 9192 kvm_x86_ops->vcpu_reset(vcpu, init_event); 9193 } 9194 9195 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) 9196 { 9197 struct kvm_segment cs; 9198 9199 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 9200 cs.selector = vector << 8; 9201 cs.base = vector << 12; 9202 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 9203 kvm_rip_write(vcpu, 0); 9204 } 9205 9206 int kvm_arch_hardware_enable(void) 9207 { 9208 struct kvm *kvm; 9209 struct kvm_vcpu *vcpu; 9210 int i; 9211 int ret; 9212 u64 local_tsc; 9213 u64 max_tsc = 0; 9214 bool stable, backwards_tsc = false; 9215 9216 kvm_shared_msr_cpu_online(); 9217 ret = kvm_x86_ops->hardware_enable(); 9218 if (ret != 0) 9219 return ret; 9220 9221 local_tsc = rdtsc(); 9222 stable = !kvm_check_tsc_unstable(); 9223 list_for_each_entry(kvm, &vm_list, vm_list) { 9224 kvm_for_each_vcpu(i, vcpu, kvm) { 9225 if (!stable && vcpu->cpu == smp_processor_id()) 9226 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 9227 if (stable && vcpu->arch.last_host_tsc > local_tsc) { 9228 backwards_tsc = true; 9229 if (vcpu->arch.last_host_tsc > max_tsc) 9230 max_tsc = vcpu->arch.last_host_tsc; 9231 } 9232 } 9233 } 9234 9235 /* 9236 * Sometimes, even reliable TSCs go backwards. This happens on 9237 * platforms that reset TSC during suspend or hibernate actions, but 9238 * maintain synchronization. We must compensate. Fortunately, we can 9239 * detect that condition here, which happens early in CPU bringup, 9240 * before any KVM threads can be running. Unfortunately, we can't 9241 * bring the TSCs fully up to date with real time, as we aren't yet far 9242 * enough into CPU bringup that we know how much real time has actually 9243 * elapsed; our helper function, ktime_get_boottime_ns() will be using boot 9244 * variables that haven't been updated yet. 9245 * 9246 * So we simply find the maximum observed TSC above, then record the 9247 * adjustment to TSC in each VCPU. When the VCPU later gets loaded, 9248 * the adjustment will be applied. Note that we accumulate 9249 * adjustments, in case multiple suspend cycles happen before some VCPU 9250 * gets a chance to run again. In the event that no KVM threads get a 9251 * chance to run, we will miss the entire elapsed period, as we'll have 9252 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may 9253 * loose cycle time. This isn't too big a deal, since the loss will be 9254 * uniform across all VCPUs (not to mention the scenario is extremely 9255 * unlikely). It is possible that a second hibernate recovery happens 9256 * much faster than a first, causing the observed TSC here to be 9257 * smaller; this would require additional padding adjustment, which is 9258 * why we set last_host_tsc to the local tsc observed here. 9259 * 9260 * N.B. - this code below runs only on platforms with reliable TSC, 9261 * as that is the only way backwards_tsc is set above. Also note 9262 * that this runs for ALL vcpus, which is not a bug; all VCPUs should 9263 * have the same delta_cyc adjustment applied if backwards_tsc 9264 * is detected. Note further, this adjustment is only done once, 9265 * as we reset last_host_tsc on all VCPUs to stop this from being 9266 * called multiple times (one for each physical CPU bringup). 9267 * 9268 * Platforms with unreliable TSCs don't have to deal with this, they 9269 * will be compensated by the logic in vcpu_load, which sets the TSC to 9270 * catchup mode. This will catchup all VCPUs to real time, but cannot 9271 * guarantee that they stay in perfect synchronization. 9272 */ 9273 if (backwards_tsc) { 9274 u64 delta_cyc = max_tsc - local_tsc; 9275 list_for_each_entry(kvm, &vm_list, vm_list) { 9276 kvm->arch.backwards_tsc_observed = true; 9277 kvm_for_each_vcpu(i, vcpu, kvm) { 9278 vcpu->arch.tsc_offset_adjustment += delta_cyc; 9279 vcpu->arch.last_host_tsc = local_tsc; 9280 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 9281 } 9282 9283 /* 9284 * We have to disable TSC offset matching.. if you were 9285 * booting a VM while issuing an S4 host suspend.... 9286 * you may have some problem. Solving this issue is 9287 * left as an exercise to the reader. 9288 */ 9289 kvm->arch.last_tsc_nsec = 0; 9290 kvm->arch.last_tsc_write = 0; 9291 } 9292 9293 } 9294 return 0; 9295 } 9296 9297 void kvm_arch_hardware_disable(void) 9298 { 9299 kvm_x86_ops->hardware_disable(); 9300 drop_user_return_notifiers(); 9301 } 9302 9303 int kvm_arch_hardware_setup(void) 9304 { 9305 int r; 9306 9307 r = kvm_x86_ops->hardware_setup(); 9308 if (r != 0) 9309 return r; 9310 9311 if (kvm_has_tsc_control) { 9312 /* 9313 * Make sure the user can only configure tsc_khz values that 9314 * fit into a signed integer. 9315 * A min value is not calculated because it will always 9316 * be 1 on all machines. 9317 */ 9318 u64 max = min(0x7fffffffULL, 9319 __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz)); 9320 kvm_max_guest_tsc_khz = max; 9321 9322 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits; 9323 } 9324 9325 kvm_init_msr_list(); 9326 return 0; 9327 } 9328 9329 void kvm_arch_hardware_unsetup(void) 9330 { 9331 kvm_x86_ops->hardware_unsetup(); 9332 } 9333 9334 int kvm_arch_check_processor_compat(void) 9335 { 9336 return kvm_x86_ops->check_processor_compatibility(); 9337 } 9338 9339 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) 9340 { 9341 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; 9342 } 9343 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); 9344 9345 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) 9346 { 9347 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0; 9348 } 9349 9350 struct static_key kvm_no_apic_vcpu __read_mostly; 9351 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu); 9352 9353 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 9354 { 9355 struct page *page; 9356 int r; 9357 9358 vcpu->arch.emulate_ctxt.ops = &emulate_ops; 9359 if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu)) 9360 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 9361 else 9362 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; 9363 9364 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 9365 if (!page) { 9366 r = -ENOMEM; 9367 goto fail; 9368 } 9369 vcpu->arch.pio_data = page_address(page); 9370 9371 kvm_set_tsc_khz(vcpu, max_tsc_khz); 9372 9373 r = kvm_mmu_create(vcpu); 9374 if (r < 0) 9375 goto fail_free_pio_data; 9376 9377 if (irqchip_in_kernel(vcpu->kvm)) { 9378 vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu); 9379 r = kvm_create_lapic(vcpu, lapic_timer_advance_ns); 9380 if (r < 0) 9381 goto fail_mmu_destroy; 9382 } else 9383 static_key_slow_inc(&kvm_no_apic_vcpu); 9384 9385 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, 9386 GFP_KERNEL_ACCOUNT); 9387 if (!vcpu->arch.mce_banks) { 9388 r = -ENOMEM; 9389 goto fail_free_lapic; 9390 } 9391 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; 9392 9393 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, 9394 GFP_KERNEL_ACCOUNT)) { 9395 r = -ENOMEM; 9396 goto fail_free_mce_banks; 9397 } 9398 9399 fx_init(vcpu); 9400 9401 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; 9402 9403 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); 9404 9405 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT; 9406 9407 kvm_async_pf_hash_reset(vcpu); 9408 kvm_pmu_init(vcpu); 9409 9410 vcpu->arch.pending_external_vector = -1; 9411 vcpu->arch.preempted_in_kernel = false; 9412 9413 kvm_hv_vcpu_init(vcpu); 9414 9415 return 0; 9416 9417 fail_free_mce_banks: 9418 kfree(vcpu->arch.mce_banks); 9419 fail_free_lapic: 9420 kvm_free_lapic(vcpu); 9421 fail_mmu_destroy: 9422 kvm_mmu_destroy(vcpu); 9423 fail_free_pio_data: 9424 free_page((unsigned long)vcpu->arch.pio_data); 9425 fail: 9426 return r; 9427 } 9428 9429 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 9430 { 9431 int idx; 9432 9433 kvm_hv_vcpu_uninit(vcpu); 9434 kvm_pmu_destroy(vcpu); 9435 kfree(vcpu->arch.mce_banks); 9436 kvm_free_lapic(vcpu); 9437 idx = srcu_read_lock(&vcpu->kvm->srcu); 9438 kvm_mmu_destroy(vcpu); 9439 srcu_read_unlock(&vcpu->kvm->srcu, idx); 9440 free_page((unsigned long)vcpu->arch.pio_data); 9441 if (!lapic_in_kernel(vcpu)) 9442 static_key_slow_dec(&kvm_no_apic_vcpu); 9443 } 9444 9445 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) 9446 { 9447 vcpu->arch.l1tf_flush_l1d = true; 9448 kvm_x86_ops->sched_in(vcpu, cpu); 9449 } 9450 9451 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 9452 { 9453 if (type) 9454 return -EINVAL; 9455 9456 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list); 9457 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); 9458 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); 9459 INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages); 9460 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); 9461 atomic_set(&kvm->arch.noncoherent_dma_count, 0); 9462 9463 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ 9464 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); 9465 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ 9466 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, 9467 &kvm->arch.irq_sources_bitmap); 9468 9469 raw_spin_lock_init(&kvm->arch.tsc_write_lock); 9470 mutex_init(&kvm->arch.apic_map_lock); 9471 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock); 9472 9473 kvm->arch.kvmclock_offset = -ktime_get_boottime_ns(); 9474 pvclock_update_vm_gtod_copy(kvm); 9475 9476 kvm->arch.guest_can_read_msr_platform_info = true; 9477 9478 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn); 9479 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn); 9480 9481 kvm_hv_init_vm(kvm); 9482 kvm_page_track_init(kvm); 9483 kvm_mmu_init_vm(kvm); 9484 9485 return kvm_x86_ops->vm_init(kvm); 9486 } 9487 9488 int kvm_arch_post_init_vm(struct kvm *kvm) 9489 { 9490 return kvm_mmu_post_init_vm(kvm); 9491 } 9492 9493 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) 9494 { 9495 vcpu_load(vcpu); 9496 kvm_mmu_unload(vcpu); 9497 vcpu_put(vcpu); 9498 } 9499 9500 static void kvm_free_vcpus(struct kvm *kvm) 9501 { 9502 unsigned int i; 9503 struct kvm_vcpu *vcpu; 9504 9505 /* 9506 * Unpin any mmu pages first. 9507 */ 9508 kvm_for_each_vcpu(i, vcpu, kvm) { 9509 kvm_clear_async_pf_completion_queue(vcpu); 9510 kvm_unload_vcpu_mmu(vcpu); 9511 } 9512 kvm_for_each_vcpu(i, vcpu, kvm) 9513 kvm_arch_vcpu_free(vcpu); 9514 9515 mutex_lock(&kvm->lock); 9516 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 9517 kvm->vcpus[i] = NULL; 9518 9519 atomic_set(&kvm->online_vcpus, 0); 9520 mutex_unlock(&kvm->lock); 9521 } 9522 9523 void kvm_arch_sync_events(struct kvm *kvm) 9524 { 9525 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work); 9526 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work); 9527 kvm_free_pit(kvm); 9528 } 9529 9530 int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 9531 { 9532 int i, r; 9533 unsigned long hva; 9534 struct kvm_memslots *slots = kvm_memslots(kvm); 9535 struct kvm_memory_slot *slot, old; 9536 9537 /* Called with kvm->slots_lock held. */ 9538 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM)) 9539 return -EINVAL; 9540 9541 slot = id_to_memslot(slots, id); 9542 if (size) { 9543 if (slot->npages) 9544 return -EEXIST; 9545 9546 /* 9547 * MAP_SHARED to prevent internal slot pages from being moved 9548 * by fork()/COW. 9549 */ 9550 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE, 9551 MAP_SHARED | MAP_ANONYMOUS, 0); 9552 if (IS_ERR((void *)hva)) 9553 return PTR_ERR((void *)hva); 9554 } else { 9555 if (!slot->npages) 9556 return 0; 9557 9558 hva = 0; 9559 } 9560 9561 old = *slot; 9562 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 9563 struct kvm_userspace_memory_region m; 9564 9565 m.slot = id | (i << 16); 9566 m.flags = 0; 9567 m.guest_phys_addr = gpa; 9568 m.userspace_addr = hva; 9569 m.memory_size = size; 9570 r = __kvm_set_memory_region(kvm, &m); 9571 if (r < 0) 9572 return r; 9573 } 9574 9575 if (!size) 9576 vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE); 9577 9578 return 0; 9579 } 9580 EXPORT_SYMBOL_GPL(__x86_set_memory_region); 9581 9582 int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 9583 { 9584 int r; 9585 9586 mutex_lock(&kvm->slots_lock); 9587 r = __x86_set_memory_region(kvm, id, gpa, size); 9588 mutex_unlock(&kvm->slots_lock); 9589 9590 return r; 9591 } 9592 EXPORT_SYMBOL_GPL(x86_set_memory_region); 9593 9594 void kvm_arch_pre_destroy_vm(struct kvm *kvm) 9595 { 9596 kvm_mmu_pre_destroy_vm(kvm); 9597 } 9598 9599 void kvm_arch_destroy_vm(struct kvm *kvm) 9600 { 9601 if (current->mm == kvm->mm) { 9602 /* 9603 * Free memory regions allocated on behalf of userspace, 9604 * unless the the memory map has changed due to process exit 9605 * or fd copying. 9606 */ 9607 x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0); 9608 x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0); 9609 x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0); 9610 } 9611 if (kvm_x86_ops->vm_destroy) 9612 kvm_x86_ops->vm_destroy(kvm); 9613 kvm_pic_destroy(kvm); 9614 kvm_ioapic_destroy(kvm); 9615 kvm_free_vcpus(kvm); 9616 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); 9617 kfree(srcu_dereference_check(kvm->arch.pmu_event_filter, &kvm->srcu, 1)); 9618 kvm_mmu_uninit_vm(kvm); 9619 kvm_page_track_cleanup(kvm); 9620 kvm_hv_destroy_vm(kvm); 9621 } 9622 9623 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, 9624 struct kvm_memory_slot *dont) 9625 { 9626 int i; 9627 9628 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 9629 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { 9630 kvfree(free->arch.rmap[i]); 9631 free->arch.rmap[i] = NULL; 9632 } 9633 if (i == 0) 9634 continue; 9635 9636 if (!dont || free->arch.lpage_info[i - 1] != 9637 dont->arch.lpage_info[i - 1]) { 9638 kvfree(free->arch.lpage_info[i - 1]); 9639 free->arch.lpage_info[i - 1] = NULL; 9640 } 9641 } 9642 9643 kvm_page_track_free_memslot(free, dont); 9644 } 9645 9646 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 9647 unsigned long npages) 9648 { 9649 int i; 9650 9651 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 9652 struct kvm_lpage_info *linfo; 9653 unsigned long ugfn; 9654 int lpages; 9655 int level = i + 1; 9656 9657 lpages = gfn_to_index(slot->base_gfn + npages - 1, 9658 slot->base_gfn, level) + 1; 9659 9660 slot->arch.rmap[i] = 9661 kvcalloc(lpages, sizeof(*slot->arch.rmap[i]), 9662 GFP_KERNEL_ACCOUNT); 9663 if (!slot->arch.rmap[i]) 9664 goto out_free; 9665 if (i == 0) 9666 continue; 9667 9668 linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT); 9669 if (!linfo) 9670 goto out_free; 9671 9672 slot->arch.lpage_info[i - 1] = linfo; 9673 9674 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) 9675 linfo[0].disallow_lpage = 1; 9676 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) 9677 linfo[lpages - 1].disallow_lpage = 1; 9678 ugfn = slot->userspace_addr >> PAGE_SHIFT; 9679 /* 9680 * If the gfn and userspace address are not aligned wrt each 9681 * other, or if explicitly asked to, disable large page 9682 * support for this slot 9683 */ 9684 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || 9685 !kvm_largepages_enabled()) { 9686 unsigned long j; 9687 9688 for (j = 0; j < lpages; ++j) 9689 linfo[j].disallow_lpage = 1; 9690 } 9691 } 9692 9693 if (kvm_page_track_create_memslot(slot, npages)) 9694 goto out_free; 9695 9696 return 0; 9697 9698 out_free: 9699 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 9700 kvfree(slot->arch.rmap[i]); 9701 slot->arch.rmap[i] = NULL; 9702 if (i == 0) 9703 continue; 9704 9705 kvfree(slot->arch.lpage_info[i - 1]); 9706 slot->arch.lpage_info[i - 1] = NULL; 9707 } 9708 return -ENOMEM; 9709 } 9710 9711 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) 9712 { 9713 /* 9714 * memslots->generation has been incremented. 9715 * mmio generation may have reached its maximum value. 9716 */ 9717 kvm_mmu_invalidate_mmio_sptes(kvm, gen); 9718 } 9719 9720 int kvm_arch_prepare_memory_region(struct kvm *kvm, 9721 struct kvm_memory_slot *memslot, 9722 const struct kvm_userspace_memory_region *mem, 9723 enum kvm_mr_change change) 9724 { 9725 return 0; 9726 } 9727 9728 static void kvm_mmu_slot_apply_flags(struct kvm *kvm, 9729 struct kvm_memory_slot *new) 9730 { 9731 /* Still write protect RO slot */ 9732 if (new->flags & KVM_MEM_READONLY) { 9733 kvm_mmu_slot_remove_write_access(kvm, new); 9734 return; 9735 } 9736 9737 /* 9738 * Call kvm_x86_ops dirty logging hooks when they are valid. 9739 * 9740 * kvm_x86_ops->slot_disable_log_dirty is called when: 9741 * 9742 * - KVM_MR_CREATE with dirty logging is disabled 9743 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag 9744 * 9745 * The reason is, in case of PML, we need to set D-bit for any slots 9746 * with dirty logging disabled in order to eliminate unnecessary GPA 9747 * logging in PML buffer (and potential PML buffer full VMEXT). This 9748 * guarantees leaving PML enabled during guest's lifetime won't have 9749 * any additional overhead from PML when guest is running with dirty 9750 * logging disabled for memory slots. 9751 * 9752 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot 9753 * to dirty logging mode. 9754 * 9755 * If kvm_x86_ops dirty logging hooks are invalid, use write protect. 9756 * 9757 * In case of write protect: 9758 * 9759 * Write protect all pages for dirty logging. 9760 * 9761 * All the sptes including the large sptes which point to this 9762 * slot are set to readonly. We can not create any new large 9763 * spte on this slot until the end of the logging. 9764 * 9765 * See the comments in fast_page_fault(). 9766 */ 9767 if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) { 9768 if (kvm_x86_ops->slot_enable_log_dirty) 9769 kvm_x86_ops->slot_enable_log_dirty(kvm, new); 9770 else 9771 kvm_mmu_slot_remove_write_access(kvm, new); 9772 } else { 9773 if (kvm_x86_ops->slot_disable_log_dirty) 9774 kvm_x86_ops->slot_disable_log_dirty(kvm, new); 9775 } 9776 } 9777 9778 void kvm_arch_commit_memory_region(struct kvm *kvm, 9779 const struct kvm_userspace_memory_region *mem, 9780 const struct kvm_memory_slot *old, 9781 const struct kvm_memory_slot *new, 9782 enum kvm_mr_change change) 9783 { 9784 if (!kvm->arch.n_requested_mmu_pages) 9785 kvm_mmu_change_mmu_pages(kvm, 9786 kvm_mmu_calculate_default_mmu_pages(kvm)); 9787 9788 /* 9789 * Dirty logging tracks sptes in 4k granularity, meaning that large 9790 * sptes have to be split. If live migration is successful, the guest 9791 * in the source machine will be destroyed and large sptes will be 9792 * created in the destination. However, if the guest continues to run 9793 * in the source machine (for example if live migration fails), small 9794 * sptes will remain around and cause bad performance. 9795 * 9796 * Scan sptes if dirty logging has been stopped, dropping those 9797 * which can be collapsed into a single large-page spte. Later 9798 * page faults will create the large-page sptes. 9799 * 9800 * There is no need to do this in any of the following cases: 9801 * CREATE: No dirty mappings will already exist. 9802 * MOVE/DELETE: The old mappings will already have been cleaned up by 9803 * kvm_arch_flush_shadow_memslot() 9804 */ 9805 if (change == KVM_MR_FLAGS_ONLY && 9806 (old->flags & KVM_MEM_LOG_DIRTY_PAGES) && 9807 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) 9808 kvm_mmu_zap_collapsible_sptes(kvm, new); 9809 9810 /* 9811 * Set up write protection and/or dirty logging for the new slot. 9812 * 9813 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have 9814 * been zapped so no dirty logging staff is needed for old slot. For 9815 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the 9816 * new and it's also covered when dealing with the new slot. 9817 * 9818 * FIXME: const-ify all uses of struct kvm_memory_slot. 9819 */ 9820 if (change != KVM_MR_DELETE) 9821 kvm_mmu_slot_apply_flags(kvm, (struct kvm_memory_slot *) new); 9822 } 9823 9824 void kvm_arch_flush_shadow_all(struct kvm *kvm) 9825 { 9826 kvm_mmu_zap_all(kvm); 9827 } 9828 9829 void kvm_arch_flush_shadow_memslot(struct kvm *kvm, 9830 struct kvm_memory_slot *slot) 9831 { 9832 kvm_page_track_flush_slot(kvm, slot); 9833 } 9834 9835 static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) 9836 { 9837 return (is_guest_mode(vcpu) && 9838 kvm_x86_ops->guest_apic_has_interrupt && 9839 kvm_x86_ops->guest_apic_has_interrupt(vcpu)); 9840 } 9841 9842 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) 9843 { 9844 if (!list_empty_careful(&vcpu->async_pf.done)) 9845 return true; 9846 9847 if (kvm_apic_has_events(vcpu)) 9848 return true; 9849 9850 if (vcpu->arch.pv.pv_unhalted) 9851 return true; 9852 9853 if (vcpu->arch.exception.pending) 9854 return true; 9855 9856 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 9857 (vcpu->arch.nmi_pending && 9858 kvm_x86_ops->nmi_allowed(vcpu))) 9859 return true; 9860 9861 if (kvm_test_request(KVM_REQ_SMI, vcpu) || 9862 (vcpu->arch.smi_pending && !is_smm(vcpu))) 9863 return true; 9864 9865 if (kvm_arch_interrupt_allowed(vcpu) && 9866 (kvm_cpu_has_interrupt(vcpu) || 9867 kvm_guest_apic_has_interrupt(vcpu))) 9868 return true; 9869 9870 if (kvm_hv_has_stimer_pending(vcpu)) 9871 return true; 9872 9873 return false; 9874 } 9875 9876 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 9877 { 9878 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu); 9879 } 9880 9881 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) 9882 { 9883 if (READ_ONCE(vcpu->arch.pv.pv_unhalted)) 9884 return true; 9885 9886 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 9887 kvm_test_request(KVM_REQ_SMI, vcpu) || 9888 kvm_test_request(KVM_REQ_EVENT, vcpu)) 9889 return true; 9890 9891 if (vcpu->arch.apicv_active && kvm_x86_ops->dy_apicv_has_pending_interrupt(vcpu)) 9892 return true; 9893 9894 return false; 9895 } 9896 9897 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 9898 { 9899 return vcpu->arch.preempted_in_kernel; 9900 } 9901 9902 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 9903 { 9904 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 9905 } 9906 9907 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) 9908 { 9909 return kvm_x86_ops->interrupt_allowed(vcpu); 9910 } 9911 9912 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu) 9913 { 9914 if (is_64_bit_mode(vcpu)) 9915 return kvm_rip_read(vcpu); 9916 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) + 9917 kvm_rip_read(vcpu)); 9918 } 9919 EXPORT_SYMBOL_GPL(kvm_get_linear_rip); 9920 9921 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip) 9922 { 9923 return kvm_get_linear_rip(vcpu) == linear_rip; 9924 } 9925 EXPORT_SYMBOL_GPL(kvm_is_linear_rip); 9926 9927 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) 9928 { 9929 unsigned long rflags; 9930 9931 rflags = kvm_x86_ops->get_rflags(vcpu); 9932 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 9933 rflags &= ~X86_EFLAGS_TF; 9934 return rflags; 9935 } 9936 EXPORT_SYMBOL_GPL(kvm_get_rflags); 9937 9938 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 9939 { 9940 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && 9941 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip)) 9942 rflags |= X86_EFLAGS_TF; 9943 kvm_x86_ops->set_rflags(vcpu, rflags); 9944 } 9945 9946 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 9947 { 9948 __kvm_set_rflags(vcpu, rflags); 9949 kvm_make_request(KVM_REQ_EVENT, vcpu); 9950 } 9951 EXPORT_SYMBOL_GPL(kvm_set_rflags); 9952 9953 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work) 9954 { 9955 int r; 9956 9957 if ((vcpu->arch.mmu->direct_map != work->arch.direct_map) || 9958 work->wakeup_all) 9959 return; 9960 9961 r = kvm_mmu_reload(vcpu); 9962 if (unlikely(r)) 9963 return; 9964 9965 if (!vcpu->arch.mmu->direct_map && 9966 work->arch.cr3 != vcpu->arch.mmu->get_cr3(vcpu)) 9967 return; 9968 9969 vcpu->arch.mmu->page_fault(vcpu, work->gva, 0, true); 9970 } 9971 9972 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) 9973 { 9974 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); 9975 } 9976 9977 static inline u32 kvm_async_pf_next_probe(u32 key) 9978 { 9979 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1); 9980 } 9981 9982 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 9983 { 9984 u32 key = kvm_async_pf_hash_fn(gfn); 9985 9986 while (vcpu->arch.apf.gfns[key] != ~0) 9987 key = kvm_async_pf_next_probe(key); 9988 9989 vcpu->arch.apf.gfns[key] = gfn; 9990 } 9991 9992 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) 9993 { 9994 int i; 9995 u32 key = kvm_async_pf_hash_fn(gfn); 9996 9997 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) && 9998 (vcpu->arch.apf.gfns[key] != gfn && 9999 vcpu->arch.apf.gfns[key] != ~0); i++) 10000 key = kvm_async_pf_next_probe(key); 10001 10002 return key; 10003 } 10004 10005 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 10006 { 10007 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; 10008 } 10009 10010 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 10011 { 10012 u32 i, j, k; 10013 10014 i = j = kvm_async_pf_gfn_slot(vcpu, gfn); 10015 while (true) { 10016 vcpu->arch.apf.gfns[i] = ~0; 10017 do { 10018 j = kvm_async_pf_next_probe(j); 10019 if (vcpu->arch.apf.gfns[j] == ~0) 10020 return; 10021 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); 10022 /* 10023 * k lies cyclically in ]i,j] 10024 * | i.k.j | 10025 * |....j i.k.| or |.k..j i...| 10026 */ 10027 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); 10028 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; 10029 i = j; 10030 } 10031 } 10032 10033 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val) 10034 { 10035 10036 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val, 10037 sizeof(val)); 10038 } 10039 10040 static int apf_get_user(struct kvm_vcpu *vcpu, u32 *val) 10041 { 10042 10043 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, val, 10044 sizeof(u32)); 10045 } 10046 10047 static bool kvm_can_deliver_async_pf(struct kvm_vcpu *vcpu) 10048 { 10049 if (!vcpu->arch.apf.delivery_as_pf_vmexit && is_guest_mode(vcpu)) 10050 return false; 10051 10052 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) || 10053 (vcpu->arch.apf.send_user_only && 10054 kvm_x86_ops->get_cpl(vcpu) == 0)) 10055 return false; 10056 10057 return true; 10058 } 10059 10060 bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu) 10061 { 10062 if (unlikely(!lapic_in_kernel(vcpu) || 10063 kvm_event_needs_reinjection(vcpu) || 10064 vcpu->arch.exception.pending)) 10065 return false; 10066 10067 if (kvm_hlt_in_guest(vcpu->kvm) && !kvm_can_deliver_async_pf(vcpu)) 10068 return false; 10069 10070 /* 10071 * If interrupts are off we cannot even use an artificial 10072 * halt state. 10073 */ 10074 return kvm_x86_ops->interrupt_allowed(vcpu); 10075 } 10076 10077 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 10078 struct kvm_async_pf *work) 10079 { 10080 struct x86_exception fault; 10081 10082 trace_kvm_async_pf_not_present(work->arch.token, work->gva); 10083 kvm_add_async_pf_gfn(vcpu, work->arch.gfn); 10084 10085 if (kvm_can_deliver_async_pf(vcpu) && 10086 !apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) { 10087 fault.vector = PF_VECTOR; 10088 fault.error_code_valid = true; 10089 fault.error_code = 0; 10090 fault.nested_page_fault = false; 10091 fault.address = work->arch.token; 10092 fault.async_page_fault = true; 10093 kvm_inject_page_fault(vcpu, &fault); 10094 } else { 10095 /* 10096 * It is not possible to deliver a paravirtualized asynchronous 10097 * page fault, but putting the guest in an artificial halt state 10098 * can be beneficial nevertheless: if an interrupt arrives, we 10099 * can deliver it timely and perhaps the guest will schedule 10100 * another process. When the instruction that triggered a page 10101 * fault is retried, hopefully the page will be ready in the host. 10102 */ 10103 kvm_make_request(KVM_REQ_APF_HALT, vcpu); 10104 } 10105 } 10106 10107 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 10108 struct kvm_async_pf *work) 10109 { 10110 struct x86_exception fault; 10111 u32 val; 10112 10113 if (work->wakeup_all) 10114 work->arch.token = ~0; /* broadcast wakeup */ 10115 else 10116 kvm_del_async_pf_gfn(vcpu, work->arch.gfn); 10117 trace_kvm_async_pf_ready(work->arch.token, work->gva); 10118 10119 if (vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED && 10120 !apf_get_user(vcpu, &val)) { 10121 if (val == KVM_PV_REASON_PAGE_NOT_PRESENT && 10122 vcpu->arch.exception.pending && 10123 vcpu->arch.exception.nr == PF_VECTOR && 10124 !apf_put_user(vcpu, 0)) { 10125 vcpu->arch.exception.injected = false; 10126 vcpu->arch.exception.pending = false; 10127 vcpu->arch.exception.nr = 0; 10128 vcpu->arch.exception.has_error_code = false; 10129 vcpu->arch.exception.error_code = 0; 10130 vcpu->arch.exception.has_payload = false; 10131 vcpu->arch.exception.payload = 0; 10132 } else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) { 10133 fault.vector = PF_VECTOR; 10134 fault.error_code_valid = true; 10135 fault.error_code = 0; 10136 fault.nested_page_fault = false; 10137 fault.address = work->arch.token; 10138 fault.async_page_fault = true; 10139 kvm_inject_page_fault(vcpu, &fault); 10140 } 10141 } 10142 vcpu->arch.apf.halted = false; 10143 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 10144 } 10145 10146 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 10147 { 10148 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED)) 10149 return true; 10150 else 10151 return kvm_can_do_async_pf(vcpu); 10152 } 10153 10154 void kvm_arch_start_assignment(struct kvm *kvm) 10155 { 10156 atomic_inc(&kvm->arch.assigned_device_count); 10157 } 10158 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment); 10159 10160 void kvm_arch_end_assignment(struct kvm *kvm) 10161 { 10162 atomic_dec(&kvm->arch.assigned_device_count); 10163 } 10164 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment); 10165 10166 bool kvm_arch_has_assigned_device(struct kvm *kvm) 10167 { 10168 return atomic_read(&kvm->arch.assigned_device_count); 10169 } 10170 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); 10171 10172 void kvm_arch_register_noncoherent_dma(struct kvm *kvm) 10173 { 10174 atomic_inc(&kvm->arch.noncoherent_dma_count); 10175 } 10176 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma); 10177 10178 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm) 10179 { 10180 atomic_dec(&kvm->arch.noncoherent_dma_count); 10181 } 10182 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma); 10183 10184 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm) 10185 { 10186 return atomic_read(&kvm->arch.noncoherent_dma_count); 10187 } 10188 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma); 10189 10190 bool kvm_arch_has_irq_bypass(void) 10191 { 10192 return true; 10193 } 10194 10195 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, 10196 struct irq_bypass_producer *prod) 10197 { 10198 struct kvm_kernel_irqfd *irqfd = 10199 container_of(cons, struct kvm_kernel_irqfd, consumer); 10200 10201 irqfd->producer = prod; 10202 10203 return kvm_x86_ops->update_pi_irte(irqfd->kvm, 10204 prod->irq, irqfd->gsi, 1); 10205 } 10206 10207 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, 10208 struct irq_bypass_producer *prod) 10209 { 10210 int ret; 10211 struct kvm_kernel_irqfd *irqfd = 10212 container_of(cons, struct kvm_kernel_irqfd, consumer); 10213 10214 WARN_ON(irqfd->producer != prod); 10215 irqfd->producer = NULL; 10216 10217 /* 10218 * When producer of consumer is unregistered, we change back to 10219 * remapped mode, so we can re-use the current implementation 10220 * when the irq is masked/disabled or the consumer side (KVM 10221 * int this case doesn't want to receive the interrupts. 10222 */ 10223 ret = kvm_x86_ops->update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 0); 10224 if (ret) 10225 printk(KERN_INFO "irq bypass consumer (token %p) unregistration" 10226 " fails: %d\n", irqfd->consumer.token, ret); 10227 } 10228 10229 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq, 10230 uint32_t guest_irq, bool set) 10231 { 10232 return kvm_x86_ops->update_pi_irte(kvm, host_irq, guest_irq, set); 10233 } 10234 10235 bool kvm_vector_hashing_enabled(void) 10236 { 10237 return vector_hashing; 10238 } 10239 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled); 10240 10241 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 10242 { 10243 return (vcpu->arch.msr_kvm_poll_control & 1) == 0; 10244 } 10245 EXPORT_SYMBOL_GPL(kvm_arch_no_poll); 10246 10247 10248 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); 10249 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio); 10250 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); 10251 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); 10252 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); 10253 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); 10254 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); 10255 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); 10256 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); 10257 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); 10258 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed); 10259 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); 10260 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit); 10261 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts); 10262 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset); 10263 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window_update); 10264 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full); 10265 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update); 10266 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access); 10267 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi); 10268