1 /* 2 * Kernel-based Virtual Machine driver for Linux 3 * 4 * derived from drivers/kvm/kvm_main.c 5 * 6 * Copyright (C) 2006 Qumranet, Inc. 7 * Copyright (C) 2008 Qumranet, Inc. 8 * Copyright IBM Corporation, 2008 9 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 10 * 11 * Authors: 12 * Avi Kivity <avi@qumranet.com> 13 * Yaniv Kamay <yaniv@qumranet.com> 14 * Amit Shah <amit.shah@qumranet.com> 15 * Ben-Ami Yassour <benami@il.ibm.com> 16 * 17 * This work is licensed under the terms of the GNU GPL, version 2. See 18 * the COPYING file in the top-level directory. 19 * 20 */ 21 22 #include <linux/kvm_host.h> 23 #include "irq.h" 24 #include "mmu.h" 25 #include "i8254.h" 26 #include "tss.h" 27 #include "kvm_cache_regs.h" 28 #include "x86.h" 29 #include "cpuid.h" 30 #include "pmu.h" 31 #include "hyperv.h" 32 33 #include <linux/clocksource.h> 34 #include <linux/interrupt.h> 35 #include <linux/kvm.h> 36 #include <linux/fs.h> 37 #include <linux/vmalloc.h> 38 #include <linux/export.h> 39 #include <linux/moduleparam.h> 40 #include <linux/mman.h> 41 #include <linux/highmem.h> 42 #include <linux/iommu.h> 43 #include <linux/intel-iommu.h> 44 #include <linux/cpufreq.h> 45 #include <linux/user-return-notifier.h> 46 #include <linux/srcu.h> 47 #include <linux/slab.h> 48 #include <linux/perf_event.h> 49 #include <linux/uaccess.h> 50 #include <linux/hash.h> 51 #include <linux/pci.h> 52 #include <linux/timekeeper_internal.h> 53 #include <linux/pvclock_gtod.h> 54 #include <linux/kvm_irqfd.h> 55 #include <linux/irqbypass.h> 56 #include <linux/sched/stat.h> 57 #include <linux/mem_encrypt.h> 58 59 #include <trace/events/kvm.h> 60 61 #include <asm/debugreg.h> 62 #include <asm/msr.h> 63 #include <asm/desc.h> 64 #include <asm/mce.h> 65 #include <linux/kernel_stat.h> 66 #include <asm/fpu/internal.h> /* Ugh! */ 67 #include <asm/pvclock.h> 68 #include <asm/div64.h> 69 #include <asm/irq_remapping.h> 70 #include <asm/mshyperv.h> 71 #include <asm/hypervisor.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 96 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 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 /* lapic timer advance (tscdeadline mode only) in nanoseconds */ 139 unsigned int __read_mostly lapic_timer_advance_ns = 0; 140 module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR); 141 EXPORT_SYMBOL_GPL(lapic_timer_advance_ns); 142 143 static bool __read_mostly vector_hashing = true; 144 module_param(vector_hashing, bool, S_IRUGO); 145 146 bool __read_mostly enable_vmware_backdoor = false; 147 module_param(enable_vmware_backdoor, bool, S_IRUGO); 148 EXPORT_SYMBOL_GPL(enable_vmware_backdoor); 149 150 static bool __read_mostly force_emulation_prefix = false; 151 module_param(force_emulation_prefix, bool, S_IRUGO); 152 153 #define KVM_NR_SHARED_MSRS 16 154 155 struct kvm_shared_msrs_global { 156 int nr; 157 u32 msrs[KVM_NR_SHARED_MSRS]; 158 }; 159 160 struct kvm_shared_msrs { 161 struct user_return_notifier urn; 162 bool registered; 163 struct kvm_shared_msr_values { 164 u64 host; 165 u64 curr; 166 } values[KVM_NR_SHARED_MSRS]; 167 }; 168 169 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; 170 static struct kvm_shared_msrs __percpu *shared_msrs; 171 172 struct kvm_stats_debugfs_item debugfs_entries[] = { 173 { "pf_fixed", VCPU_STAT(pf_fixed) }, 174 { "pf_guest", VCPU_STAT(pf_guest) }, 175 { "tlb_flush", VCPU_STAT(tlb_flush) }, 176 { "invlpg", VCPU_STAT(invlpg) }, 177 { "exits", VCPU_STAT(exits) }, 178 { "io_exits", VCPU_STAT(io_exits) }, 179 { "mmio_exits", VCPU_STAT(mmio_exits) }, 180 { "signal_exits", VCPU_STAT(signal_exits) }, 181 { "irq_window", VCPU_STAT(irq_window_exits) }, 182 { "nmi_window", VCPU_STAT(nmi_window_exits) }, 183 { "halt_exits", VCPU_STAT(halt_exits) }, 184 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 185 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 186 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) }, 187 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 188 { "hypercalls", VCPU_STAT(hypercalls) }, 189 { "request_irq", VCPU_STAT(request_irq_exits) }, 190 { "irq_exits", VCPU_STAT(irq_exits) }, 191 { "host_state_reload", VCPU_STAT(host_state_reload) }, 192 { "fpu_reload", VCPU_STAT(fpu_reload) }, 193 { "insn_emulation", VCPU_STAT(insn_emulation) }, 194 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, 195 { "irq_injections", VCPU_STAT(irq_injections) }, 196 { "nmi_injections", VCPU_STAT(nmi_injections) }, 197 { "req_event", VCPU_STAT(req_event) }, 198 { "l1d_flush", VCPU_STAT(l1d_flush) }, 199 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, 200 { "mmu_pte_write", VM_STAT(mmu_pte_write) }, 201 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, 202 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, 203 { "mmu_flooded", VM_STAT(mmu_flooded) }, 204 { "mmu_recycled", VM_STAT(mmu_recycled) }, 205 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, 206 { "mmu_unsync", VM_STAT(mmu_unsync) }, 207 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, 208 { "largepages", VM_STAT(lpages) }, 209 { "max_mmu_page_hash_collisions", 210 VM_STAT(max_mmu_page_hash_collisions) }, 211 { NULL } 212 }; 213 214 u64 __read_mostly host_xcr0; 215 216 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); 217 218 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) 219 { 220 int i; 221 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) 222 vcpu->arch.apf.gfns[i] = ~0; 223 } 224 225 static void kvm_on_user_return(struct user_return_notifier *urn) 226 { 227 unsigned slot; 228 struct kvm_shared_msrs *locals 229 = container_of(urn, struct kvm_shared_msrs, urn); 230 struct kvm_shared_msr_values *values; 231 unsigned long flags; 232 233 /* 234 * Disabling irqs at this point since the following code could be 235 * interrupted and executed through kvm_arch_hardware_disable() 236 */ 237 local_irq_save(flags); 238 if (locals->registered) { 239 locals->registered = false; 240 user_return_notifier_unregister(urn); 241 } 242 local_irq_restore(flags); 243 for (slot = 0; slot < shared_msrs_global.nr; ++slot) { 244 values = &locals->values[slot]; 245 if (values->host != values->curr) { 246 wrmsrl(shared_msrs_global.msrs[slot], values->host); 247 values->curr = values->host; 248 } 249 } 250 } 251 252 static void shared_msr_update(unsigned slot, u32 msr) 253 { 254 u64 value; 255 unsigned int cpu = smp_processor_id(); 256 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 257 258 /* only read, and nobody should modify it at this time, 259 * so don't need lock */ 260 if (slot >= shared_msrs_global.nr) { 261 printk(KERN_ERR "kvm: invalid MSR slot!"); 262 return; 263 } 264 rdmsrl_safe(msr, &value); 265 smsr->values[slot].host = value; 266 smsr->values[slot].curr = value; 267 } 268 269 void kvm_define_shared_msr(unsigned slot, u32 msr) 270 { 271 BUG_ON(slot >= KVM_NR_SHARED_MSRS); 272 shared_msrs_global.msrs[slot] = msr; 273 if (slot >= shared_msrs_global.nr) 274 shared_msrs_global.nr = slot + 1; 275 } 276 EXPORT_SYMBOL_GPL(kvm_define_shared_msr); 277 278 static void kvm_shared_msr_cpu_online(void) 279 { 280 unsigned i; 281 282 for (i = 0; i < shared_msrs_global.nr; ++i) 283 shared_msr_update(i, shared_msrs_global.msrs[i]); 284 } 285 286 int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) 287 { 288 unsigned int cpu = smp_processor_id(); 289 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 290 int err; 291 292 if (((value ^ smsr->values[slot].curr) & mask) == 0) 293 return 0; 294 smsr->values[slot].curr = value; 295 err = wrmsrl_safe(shared_msrs_global.msrs[slot], value); 296 if (err) 297 return 1; 298 299 if (!smsr->registered) { 300 smsr->urn.on_user_return = kvm_on_user_return; 301 user_return_notifier_register(&smsr->urn); 302 smsr->registered = true; 303 } 304 return 0; 305 } 306 EXPORT_SYMBOL_GPL(kvm_set_shared_msr); 307 308 static void drop_user_return_notifiers(void) 309 { 310 unsigned int cpu = smp_processor_id(); 311 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 312 313 if (smsr->registered) 314 kvm_on_user_return(&smsr->urn); 315 } 316 317 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) 318 { 319 return vcpu->arch.apic_base; 320 } 321 EXPORT_SYMBOL_GPL(kvm_get_apic_base); 322 323 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu) 324 { 325 return kvm_apic_mode(kvm_get_apic_base(vcpu)); 326 } 327 EXPORT_SYMBOL_GPL(kvm_get_apic_mode); 328 329 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 330 { 331 enum lapic_mode old_mode = kvm_get_apic_mode(vcpu); 332 enum lapic_mode new_mode = kvm_apic_mode(msr_info->data); 333 u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) | 0x2ff | 334 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE); 335 336 if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID) 337 return 1; 338 if (!msr_info->host_initiated) { 339 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC) 340 return 1; 341 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC) 342 return 1; 343 } 344 345 kvm_lapic_set_base(vcpu, msr_info->data); 346 return 0; 347 } 348 EXPORT_SYMBOL_GPL(kvm_set_apic_base); 349 350 asmlinkage __visible void kvm_spurious_fault(void) 351 { 352 /* Fault while not rebooting. We want the trace. */ 353 BUG(); 354 } 355 EXPORT_SYMBOL_GPL(kvm_spurious_fault); 356 357 #define EXCPT_BENIGN 0 358 #define EXCPT_CONTRIBUTORY 1 359 #define EXCPT_PF 2 360 361 static int exception_class(int vector) 362 { 363 switch (vector) { 364 case PF_VECTOR: 365 return EXCPT_PF; 366 case DE_VECTOR: 367 case TS_VECTOR: 368 case NP_VECTOR: 369 case SS_VECTOR: 370 case GP_VECTOR: 371 return EXCPT_CONTRIBUTORY; 372 default: 373 break; 374 } 375 return EXCPT_BENIGN; 376 } 377 378 #define EXCPT_FAULT 0 379 #define EXCPT_TRAP 1 380 #define EXCPT_ABORT 2 381 #define EXCPT_INTERRUPT 3 382 383 static int exception_type(int vector) 384 { 385 unsigned int mask; 386 387 if (WARN_ON(vector > 31 || vector == NMI_VECTOR)) 388 return EXCPT_INTERRUPT; 389 390 mask = 1 << vector; 391 392 /* #DB is trap, as instruction watchpoints are handled elsewhere */ 393 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR))) 394 return EXCPT_TRAP; 395 396 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR))) 397 return EXCPT_ABORT; 398 399 /* Reserved exceptions will result in fault */ 400 return EXCPT_FAULT; 401 } 402 403 static void kvm_multiple_exception(struct kvm_vcpu *vcpu, 404 unsigned nr, bool has_error, u32 error_code, 405 bool reinject) 406 { 407 u32 prev_nr; 408 int class1, class2; 409 410 kvm_make_request(KVM_REQ_EVENT, vcpu); 411 412 if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) { 413 queue: 414 if (has_error && !is_protmode(vcpu)) 415 has_error = false; 416 if (reinject) { 417 /* 418 * On vmentry, vcpu->arch.exception.pending is only 419 * true if an event injection was blocked by 420 * nested_run_pending. In that case, however, 421 * vcpu_enter_guest requests an immediate exit, 422 * and the guest shouldn't proceed far enough to 423 * need reinjection. 424 */ 425 WARN_ON_ONCE(vcpu->arch.exception.pending); 426 vcpu->arch.exception.injected = true; 427 } else { 428 vcpu->arch.exception.pending = true; 429 vcpu->arch.exception.injected = false; 430 } 431 vcpu->arch.exception.has_error_code = has_error; 432 vcpu->arch.exception.nr = nr; 433 vcpu->arch.exception.error_code = error_code; 434 return; 435 } 436 437 /* to check exception */ 438 prev_nr = vcpu->arch.exception.nr; 439 if (prev_nr == DF_VECTOR) { 440 /* triple fault -> shutdown */ 441 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 442 return; 443 } 444 class1 = exception_class(prev_nr); 445 class2 = exception_class(nr); 446 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) 447 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { 448 /* 449 * Generate double fault per SDM Table 5-5. Set 450 * exception.pending = true so that the double fault 451 * can trigger a nested vmexit. 452 */ 453 vcpu->arch.exception.pending = true; 454 vcpu->arch.exception.injected = false; 455 vcpu->arch.exception.has_error_code = true; 456 vcpu->arch.exception.nr = DF_VECTOR; 457 vcpu->arch.exception.error_code = 0; 458 } else 459 /* replace previous exception with a new one in a hope 460 that instruction re-execution will regenerate lost 461 exception */ 462 goto queue; 463 } 464 465 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) 466 { 467 kvm_multiple_exception(vcpu, nr, false, 0, false); 468 } 469 EXPORT_SYMBOL_GPL(kvm_queue_exception); 470 471 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) 472 { 473 kvm_multiple_exception(vcpu, nr, false, 0, true); 474 } 475 EXPORT_SYMBOL_GPL(kvm_requeue_exception); 476 477 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) 478 { 479 if (err) 480 kvm_inject_gp(vcpu, 0); 481 else 482 return kvm_skip_emulated_instruction(vcpu); 483 484 return 1; 485 } 486 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); 487 488 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 489 { 490 ++vcpu->stat.pf_guest; 491 vcpu->arch.exception.nested_apf = 492 is_guest_mode(vcpu) && fault->async_page_fault; 493 if (vcpu->arch.exception.nested_apf) 494 vcpu->arch.apf.nested_apf_token = fault->address; 495 else 496 vcpu->arch.cr2 = fault->address; 497 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); 498 } 499 EXPORT_SYMBOL_GPL(kvm_inject_page_fault); 500 501 static bool kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 502 { 503 if (mmu_is_nested(vcpu) && !fault->nested_page_fault) 504 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault); 505 else 506 vcpu->arch.mmu.inject_page_fault(vcpu, fault); 507 508 return fault->nested_page_fault; 509 } 510 511 void kvm_inject_nmi(struct kvm_vcpu *vcpu) 512 { 513 atomic_inc(&vcpu->arch.nmi_queued); 514 kvm_make_request(KVM_REQ_NMI, vcpu); 515 } 516 EXPORT_SYMBOL_GPL(kvm_inject_nmi); 517 518 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 519 { 520 kvm_multiple_exception(vcpu, nr, true, error_code, false); 521 } 522 EXPORT_SYMBOL_GPL(kvm_queue_exception_e); 523 524 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 525 { 526 kvm_multiple_exception(vcpu, nr, true, error_code, true); 527 } 528 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); 529 530 /* 531 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue 532 * a #GP and return false. 533 */ 534 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) 535 { 536 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) 537 return true; 538 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 539 return false; 540 } 541 EXPORT_SYMBOL_GPL(kvm_require_cpl); 542 543 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr) 544 { 545 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE)) 546 return true; 547 548 kvm_queue_exception(vcpu, UD_VECTOR); 549 return false; 550 } 551 EXPORT_SYMBOL_GPL(kvm_require_dr); 552 553 /* 554 * This function will be used to read from the physical memory of the currently 555 * running guest. The difference to kvm_vcpu_read_guest_page is that this function 556 * can read from guest physical or from the guest's guest physical memory. 557 */ 558 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, 559 gfn_t ngfn, void *data, int offset, int len, 560 u32 access) 561 { 562 struct x86_exception exception; 563 gfn_t real_gfn; 564 gpa_t ngpa; 565 566 ngpa = gfn_to_gpa(ngfn); 567 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception); 568 if (real_gfn == UNMAPPED_GVA) 569 return -EFAULT; 570 571 real_gfn = gpa_to_gfn(real_gfn); 572 573 return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len); 574 } 575 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); 576 577 static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, 578 void *data, int offset, int len, u32 access) 579 { 580 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, 581 data, offset, len, access); 582 } 583 584 /* 585 * Load the pae pdptrs. Return true is they are all valid. 586 */ 587 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) 588 { 589 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; 590 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; 591 int i; 592 int ret; 593 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; 594 595 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, 596 offset * sizeof(u64), sizeof(pdpte), 597 PFERR_USER_MASK|PFERR_WRITE_MASK); 598 if (ret < 0) { 599 ret = 0; 600 goto out; 601 } 602 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { 603 if ((pdpte[i] & PT_PRESENT_MASK) && 604 (pdpte[i] & 605 vcpu->arch.mmu.guest_rsvd_check.rsvd_bits_mask[0][2])) { 606 ret = 0; 607 goto out; 608 } 609 } 610 ret = 1; 611 612 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); 613 __set_bit(VCPU_EXREG_PDPTR, 614 (unsigned long *)&vcpu->arch.regs_avail); 615 __set_bit(VCPU_EXREG_PDPTR, 616 (unsigned long *)&vcpu->arch.regs_dirty); 617 out: 618 619 return ret; 620 } 621 EXPORT_SYMBOL_GPL(load_pdptrs); 622 623 bool pdptrs_changed(struct kvm_vcpu *vcpu) 624 { 625 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; 626 bool changed = true; 627 int offset; 628 gfn_t gfn; 629 int r; 630 631 if (is_long_mode(vcpu) || !is_pae(vcpu)) 632 return false; 633 634 if (!test_bit(VCPU_EXREG_PDPTR, 635 (unsigned long *)&vcpu->arch.regs_avail)) 636 return true; 637 638 gfn = (kvm_read_cr3(vcpu) & 0xffffffe0ul) >> PAGE_SHIFT; 639 offset = (kvm_read_cr3(vcpu) & 0xffffffe0ul) & (PAGE_SIZE - 1); 640 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), 641 PFERR_USER_MASK | PFERR_WRITE_MASK); 642 if (r < 0) 643 goto out; 644 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; 645 out: 646 647 return changed; 648 } 649 EXPORT_SYMBOL_GPL(pdptrs_changed); 650 651 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) 652 { 653 unsigned long old_cr0 = kvm_read_cr0(vcpu); 654 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP; 655 656 cr0 |= X86_CR0_ET; 657 658 #ifdef CONFIG_X86_64 659 if (cr0 & 0xffffffff00000000UL) 660 return 1; 661 #endif 662 663 cr0 &= ~CR0_RESERVED_BITS; 664 665 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) 666 return 1; 667 668 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) 669 return 1; 670 671 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { 672 #ifdef CONFIG_X86_64 673 if ((vcpu->arch.efer & EFER_LME)) { 674 int cs_db, cs_l; 675 676 if (!is_pae(vcpu)) 677 return 1; 678 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 679 if (cs_l) 680 return 1; 681 } else 682 #endif 683 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 684 kvm_read_cr3(vcpu))) 685 return 1; 686 } 687 688 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) 689 return 1; 690 691 kvm_x86_ops->set_cr0(vcpu, cr0); 692 693 if ((cr0 ^ old_cr0) & X86_CR0_PG) { 694 kvm_clear_async_pf_completion_queue(vcpu); 695 kvm_async_pf_hash_reset(vcpu); 696 } 697 698 if ((cr0 ^ old_cr0) & update_bits) 699 kvm_mmu_reset_context(vcpu); 700 701 if (((cr0 ^ old_cr0) & X86_CR0_CD) && 702 kvm_arch_has_noncoherent_dma(vcpu->kvm) && 703 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) 704 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL); 705 706 return 0; 707 } 708 EXPORT_SYMBOL_GPL(kvm_set_cr0); 709 710 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) 711 { 712 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); 713 } 714 EXPORT_SYMBOL_GPL(kvm_lmsw); 715 716 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu) 717 { 718 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) && 719 !vcpu->guest_xcr0_loaded) { 720 /* kvm_set_xcr() also depends on this */ 721 if (vcpu->arch.xcr0 != host_xcr0) 722 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0); 723 vcpu->guest_xcr0_loaded = 1; 724 } 725 } 726 727 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu) 728 { 729 if (vcpu->guest_xcr0_loaded) { 730 if (vcpu->arch.xcr0 != host_xcr0) 731 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0); 732 vcpu->guest_xcr0_loaded = 0; 733 } 734 } 735 736 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 737 { 738 u64 xcr0 = xcr; 739 u64 old_xcr0 = vcpu->arch.xcr0; 740 u64 valid_bits; 741 742 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ 743 if (index != XCR_XFEATURE_ENABLED_MASK) 744 return 1; 745 if (!(xcr0 & XFEATURE_MASK_FP)) 746 return 1; 747 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE)) 748 return 1; 749 750 /* 751 * Do not allow the guest to set bits that we do not support 752 * saving. However, xcr0 bit 0 is always set, even if the 753 * emulated CPU does not support XSAVE (see fx_init). 754 */ 755 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP; 756 if (xcr0 & ~valid_bits) 757 return 1; 758 759 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) != 760 (!(xcr0 & XFEATURE_MASK_BNDCSR))) 761 return 1; 762 763 if (xcr0 & XFEATURE_MASK_AVX512) { 764 if (!(xcr0 & XFEATURE_MASK_YMM)) 765 return 1; 766 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512) 767 return 1; 768 } 769 vcpu->arch.xcr0 = xcr0; 770 771 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND) 772 kvm_update_cpuid(vcpu); 773 return 0; 774 } 775 776 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 777 { 778 if (kvm_x86_ops->get_cpl(vcpu) != 0 || 779 __kvm_set_xcr(vcpu, index, xcr)) { 780 kvm_inject_gp(vcpu, 0); 781 return 1; 782 } 783 return 0; 784 } 785 EXPORT_SYMBOL_GPL(kvm_set_xcr); 786 787 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 788 { 789 unsigned long old_cr4 = kvm_read_cr4(vcpu); 790 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | 791 X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE; 792 793 if (cr4 & CR4_RESERVED_BITS) 794 return 1; 795 796 if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && (cr4 & X86_CR4_OSXSAVE)) 797 return 1; 798 799 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMEP) && (cr4 & X86_CR4_SMEP)) 800 return 1; 801 802 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMAP) && (cr4 & X86_CR4_SMAP)) 803 return 1; 804 805 if (!guest_cpuid_has(vcpu, X86_FEATURE_FSGSBASE) && (cr4 & X86_CR4_FSGSBASE)) 806 return 1; 807 808 if (!guest_cpuid_has(vcpu, X86_FEATURE_PKU) && (cr4 & X86_CR4_PKE)) 809 return 1; 810 811 if (!guest_cpuid_has(vcpu, X86_FEATURE_LA57) && (cr4 & X86_CR4_LA57)) 812 return 1; 813 814 if (!guest_cpuid_has(vcpu, X86_FEATURE_UMIP) && (cr4 & X86_CR4_UMIP)) 815 return 1; 816 817 if (is_long_mode(vcpu)) { 818 if (!(cr4 & X86_CR4_PAE)) 819 return 1; 820 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) 821 && ((cr4 ^ old_cr4) & pdptr_bits) 822 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 823 kvm_read_cr3(vcpu))) 824 return 1; 825 826 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) { 827 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID)) 828 return 1; 829 830 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */ 831 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu)) 832 return 1; 833 } 834 835 if (kvm_x86_ops->set_cr4(vcpu, cr4)) 836 return 1; 837 838 if (((cr4 ^ old_cr4) & pdptr_bits) || 839 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))) 840 kvm_mmu_reset_context(vcpu); 841 842 if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE)) 843 kvm_update_cpuid(vcpu); 844 845 return 0; 846 } 847 EXPORT_SYMBOL_GPL(kvm_set_cr4); 848 849 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 850 { 851 bool skip_tlb_flush = false; 852 #ifdef CONFIG_X86_64 853 bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); 854 855 if (pcid_enabled) { 856 skip_tlb_flush = cr3 & X86_CR3_PCID_NOFLUSH; 857 cr3 &= ~X86_CR3_PCID_NOFLUSH; 858 } 859 #endif 860 861 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { 862 if (!skip_tlb_flush) { 863 kvm_mmu_sync_roots(vcpu); 864 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 865 } 866 return 0; 867 } 868 869 if (is_long_mode(vcpu) && 870 (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63))) 871 return 1; 872 else if (is_pae(vcpu) && is_paging(vcpu) && 873 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 874 return 1; 875 876 kvm_mmu_new_cr3(vcpu, cr3, skip_tlb_flush); 877 vcpu->arch.cr3 = cr3; 878 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 879 880 return 0; 881 } 882 EXPORT_SYMBOL_GPL(kvm_set_cr3); 883 884 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) 885 { 886 if (cr8 & CR8_RESERVED_BITS) 887 return 1; 888 if (lapic_in_kernel(vcpu)) 889 kvm_lapic_set_tpr(vcpu, cr8); 890 else 891 vcpu->arch.cr8 = cr8; 892 return 0; 893 } 894 EXPORT_SYMBOL_GPL(kvm_set_cr8); 895 896 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) 897 { 898 if (lapic_in_kernel(vcpu)) 899 return kvm_lapic_get_cr8(vcpu); 900 else 901 return vcpu->arch.cr8; 902 } 903 EXPORT_SYMBOL_GPL(kvm_get_cr8); 904 905 static void kvm_update_dr0123(struct kvm_vcpu *vcpu) 906 { 907 int i; 908 909 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { 910 for (i = 0; i < KVM_NR_DB_REGS; i++) 911 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 912 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD; 913 } 914 } 915 916 static void kvm_update_dr6(struct kvm_vcpu *vcpu) 917 { 918 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 919 kvm_x86_ops->set_dr6(vcpu, vcpu->arch.dr6); 920 } 921 922 static void kvm_update_dr7(struct kvm_vcpu *vcpu) 923 { 924 unsigned long dr7; 925 926 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 927 dr7 = vcpu->arch.guest_debug_dr7; 928 else 929 dr7 = vcpu->arch.dr7; 930 kvm_x86_ops->set_dr7(vcpu, dr7); 931 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED; 932 if (dr7 & DR7_BP_EN_MASK) 933 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED; 934 } 935 936 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu) 937 { 938 u64 fixed = DR6_FIXED_1; 939 940 if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM)) 941 fixed |= DR6_RTM; 942 return fixed; 943 } 944 945 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 946 { 947 switch (dr) { 948 case 0 ... 3: 949 vcpu->arch.db[dr] = val; 950 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 951 vcpu->arch.eff_db[dr] = val; 952 break; 953 case 4: 954 /* fall through */ 955 case 6: 956 if (val & 0xffffffff00000000ULL) 957 return -1; /* #GP */ 958 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu); 959 kvm_update_dr6(vcpu); 960 break; 961 case 5: 962 /* fall through */ 963 default: /* 7 */ 964 if (val & 0xffffffff00000000ULL) 965 return -1; /* #GP */ 966 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; 967 kvm_update_dr7(vcpu); 968 break; 969 } 970 971 return 0; 972 } 973 974 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 975 { 976 if (__kvm_set_dr(vcpu, dr, val)) { 977 kvm_inject_gp(vcpu, 0); 978 return 1; 979 } 980 return 0; 981 } 982 EXPORT_SYMBOL_GPL(kvm_set_dr); 983 984 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) 985 { 986 switch (dr) { 987 case 0 ... 3: 988 *val = vcpu->arch.db[dr]; 989 break; 990 case 4: 991 /* fall through */ 992 case 6: 993 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 994 *val = vcpu->arch.dr6; 995 else 996 *val = kvm_x86_ops->get_dr6(vcpu); 997 break; 998 case 5: 999 /* fall through */ 1000 default: /* 7 */ 1001 *val = vcpu->arch.dr7; 1002 break; 1003 } 1004 return 0; 1005 } 1006 EXPORT_SYMBOL_GPL(kvm_get_dr); 1007 1008 bool kvm_rdpmc(struct kvm_vcpu *vcpu) 1009 { 1010 u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); 1011 u64 data; 1012 int err; 1013 1014 err = kvm_pmu_rdpmc(vcpu, ecx, &data); 1015 if (err) 1016 return err; 1017 kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data); 1018 kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32); 1019 return err; 1020 } 1021 EXPORT_SYMBOL_GPL(kvm_rdpmc); 1022 1023 /* 1024 * List of msr numbers which we expose to userspace through KVM_GET_MSRS 1025 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. 1026 * 1027 * This list is modified at module load time to reflect the 1028 * capabilities of the host cpu. This capabilities test skips MSRs that are 1029 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs 1030 * may depend on host virtualization features rather than host cpu features. 1031 */ 1032 1033 static u32 msrs_to_save[] = { 1034 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, 1035 MSR_STAR, 1036 #ifdef CONFIG_X86_64 1037 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, 1038 #endif 1039 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA, 1040 MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS, MSR_TSC_AUX, 1041 MSR_IA32_SPEC_CTRL, MSR_IA32_ARCH_CAPABILITIES 1042 }; 1043 1044 static unsigned num_msrs_to_save; 1045 1046 static u32 emulated_msrs[] = { 1047 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, 1048 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, 1049 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, 1050 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC, 1051 HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY, 1052 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2, 1053 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL, 1054 HV_X64_MSR_RESET, 1055 HV_X64_MSR_VP_INDEX, 1056 HV_X64_MSR_VP_RUNTIME, 1057 HV_X64_MSR_SCONTROL, 1058 HV_X64_MSR_STIMER0_CONFIG, 1059 HV_X64_MSR_VP_ASSIST_PAGE, 1060 HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL, 1061 HV_X64_MSR_TSC_EMULATION_STATUS, 1062 1063 MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, 1064 MSR_KVM_PV_EOI_EN, 1065 1066 MSR_IA32_TSC_ADJUST, 1067 MSR_IA32_TSCDEADLINE, 1068 MSR_IA32_MISC_ENABLE, 1069 MSR_IA32_MCG_STATUS, 1070 MSR_IA32_MCG_CTL, 1071 MSR_IA32_MCG_EXT_CTL, 1072 MSR_IA32_SMBASE, 1073 MSR_SMI_COUNT, 1074 MSR_PLATFORM_INFO, 1075 MSR_MISC_FEATURES_ENABLES, 1076 MSR_AMD64_VIRT_SPEC_CTRL, 1077 }; 1078 1079 static unsigned num_emulated_msrs; 1080 1081 /* 1082 * List of msr numbers which are used to expose MSR-based features that 1083 * can be used by a hypervisor to validate requested CPU features. 1084 */ 1085 static u32 msr_based_features[] = { 1086 MSR_IA32_VMX_BASIC, 1087 MSR_IA32_VMX_TRUE_PINBASED_CTLS, 1088 MSR_IA32_VMX_PINBASED_CTLS, 1089 MSR_IA32_VMX_TRUE_PROCBASED_CTLS, 1090 MSR_IA32_VMX_PROCBASED_CTLS, 1091 MSR_IA32_VMX_TRUE_EXIT_CTLS, 1092 MSR_IA32_VMX_EXIT_CTLS, 1093 MSR_IA32_VMX_TRUE_ENTRY_CTLS, 1094 MSR_IA32_VMX_ENTRY_CTLS, 1095 MSR_IA32_VMX_MISC, 1096 MSR_IA32_VMX_CR0_FIXED0, 1097 MSR_IA32_VMX_CR0_FIXED1, 1098 MSR_IA32_VMX_CR4_FIXED0, 1099 MSR_IA32_VMX_CR4_FIXED1, 1100 MSR_IA32_VMX_VMCS_ENUM, 1101 MSR_IA32_VMX_PROCBASED_CTLS2, 1102 MSR_IA32_VMX_EPT_VPID_CAP, 1103 MSR_IA32_VMX_VMFUNC, 1104 1105 MSR_F10H_DECFG, 1106 MSR_IA32_UCODE_REV, 1107 MSR_IA32_ARCH_CAPABILITIES, 1108 }; 1109 1110 static unsigned int num_msr_based_features; 1111 1112 u64 kvm_get_arch_capabilities(void) 1113 { 1114 u64 data; 1115 1116 rdmsrl_safe(MSR_IA32_ARCH_CAPABILITIES, &data); 1117 1118 /* 1119 * If we're doing cache flushes (either "always" or "cond") 1120 * we will do one whenever the guest does a vmlaunch/vmresume. 1121 * If an outer hypervisor is doing the cache flush for us 1122 * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that 1123 * capability to the guest too, and if EPT is disabled we're not 1124 * vulnerable. Overall, only VMENTER_L1D_FLUSH_NEVER will 1125 * require a nested hypervisor to do a flush of its own. 1126 */ 1127 if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER) 1128 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH; 1129 1130 return data; 1131 } 1132 EXPORT_SYMBOL_GPL(kvm_get_arch_capabilities); 1133 1134 static int kvm_get_msr_feature(struct kvm_msr_entry *msr) 1135 { 1136 switch (msr->index) { 1137 case MSR_IA32_ARCH_CAPABILITIES: 1138 msr->data = kvm_get_arch_capabilities(); 1139 break; 1140 case MSR_IA32_UCODE_REV: 1141 rdmsrl_safe(msr->index, &msr->data); 1142 break; 1143 default: 1144 if (kvm_x86_ops->get_msr_feature(msr)) 1145 return 1; 1146 } 1147 return 0; 1148 } 1149 1150 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1151 { 1152 struct kvm_msr_entry msr; 1153 int r; 1154 1155 msr.index = index; 1156 r = kvm_get_msr_feature(&msr); 1157 if (r) 1158 return r; 1159 1160 *data = msr.data; 1161 1162 return 0; 1163 } 1164 1165 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1166 { 1167 if (efer & efer_reserved_bits) 1168 return false; 1169 1170 if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT)) 1171 return false; 1172 1173 if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM)) 1174 return false; 1175 1176 return true; 1177 } 1178 EXPORT_SYMBOL_GPL(kvm_valid_efer); 1179 1180 static int set_efer(struct kvm_vcpu *vcpu, u64 efer) 1181 { 1182 u64 old_efer = vcpu->arch.efer; 1183 1184 if (!kvm_valid_efer(vcpu, efer)) 1185 return 1; 1186 1187 if (is_paging(vcpu) 1188 && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) 1189 return 1; 1190 1191 efer &= ~EFER_LMA; 1192 efer |= vcpu->arch.efer & EFER_LMA; 1193 1194 kvm_x86_ops->set_efer(vcpu, efer); 1195 1196 /* Update reserved bits */ 1197 if ((efer ^ old_efer) & EFER_NX) 1198 kvm_mmu_reset_context(vcpu); 1199 1200 return 0; 1201 } 1202 1203 void kvm_enable_efer_bits(u64 mask) 1204 { 1205 efer_reserved_bits &= ~mask; 1206 } 1207 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); 1208 1209 /* 1210 * Writes msr value into into the appropriate "register". 1211 * Returns 0 on success, non-0 otherwise. 1212 * Assumes vcpu_load() was already called. 1213 */ 1214 int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) 1215 { 1216 switch (msr->index) { 1217 case MSR_FS_BASE: 1218 case MSR_GS_BASE: 1219 case MSR_KERNEL_GS_BASE: 1220 case MSR_CSTAR: 1221 case MSR_LSTAR: 1222 if (is_noncanonical_address(msr->data, vcpu)) 1223 return 1; 1224 break; 1225 case MSR_IA32_SYSENTER_EIP: 1226 case MSR_IA32_SYSENTER_ESP: 1227 /* 1228 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if 1229 * non-canonical address is written on Intel but not on 1230 * AMD (which ignores the top 32-bits, because it does 1231 * not implement 64-bit SYSENTER). 1232 * 1233 * 64-bit code should hence be able to write a non-canonical 1234 * value on AMD. Making the address canonical ensures that 1235 * vmentry does not fail on Intel after writing a non-canonical 1236 * value, and that something deterministic happens if the guest 1237 * invokes 64-bit SYSENTER. 1238 */ 1239 msr->data = get_canonical(msr->data, vcpu_virt_addr_bits(vcpu)); 1240 } 1241 return kvm_x86_ops->set_msr(vcpu, msr); 1242 } 1243 EXPORT_SYMBOL_GPL(kvm_set_msr); 1244 1245 /* 1246 * Adapt set_msr() to msr_io()'s calling convention 1247 */ 1248 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1249 { 1250 struct msr_data msr; 1251 int r; 1252 1253 msr.index = index; 1254 msr.host_initiated = true; 1255 r = kvm_get_msr(vcpu, &msr); 1256 if (r) 1257 return r; 1258 1259 *data = msr.data; 1260 return 0; 1261 } 1262 1263 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1264 { 1265 struct msr_data msr; 1266 1267 msr.data = *data; 1268 msr.index = index; 1269 msr.host_initiated = true; 1270 return kvm_set_msr(vcpu, &msr); 1271 } 1272 1273 #ifdef CONFIG_X86_64 1274 struct pvclock_gtod_data { 1275 seqcount_t seq; 1276 1277 struct { /* extract of a clocksource struct */ 1278 int vclock_mode; 1279 u64 cycle_last; 1280 u64 mask; 1281 u32 mult; 1282 u32 shift; 1283 } clock; 1284 1285 u64 boot_ns; 1286 u64 nsec_base; 1287 u64 wall_time_sec; 1288 }; 1289 1290 static struct pvclock_gtod_data pvclock_gtod_data; 1291 1292 static void update_pvclock_gtod(struct timekeeper *tk) 1293 { 1294 struct pvclock_gtod_data *vdata = &pvclock_gtod_data; 1295 u64 boot_ns; 1296 1297 boot_ns = ktime_to_ns(ktime_add(tk->tkr_mono.base, tk->offs_boot)); 1298 1299 write_seqcount_begin(&vdata->seq); 1300 1301 /* copy pvclock gtod data */ 1302 vdata->clock.vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode; 1303 vdata->clock.cycle_last = tk->tkr_mono.cycle_last; 1304 vdata->clock.mask = tk->tkr_mono.mask; 1305 vdata->clock.mult = tk->tkr_mono.mult; 1306 vdata->clock.shift = tk->tkr_mono.shift; 1307 1308 vdata->boot_ns = boot_ns; 1309 vdata->nsec_base = tk->tkr_mono.xtime_nsec; 1310 1311 vdata->wall_time_sec = tk->xtime_sec; 1312 1313 write_seqcount_end(&vdata->seq); 1314 } 1315 #endif 1316 1317 void kvm_set_pending_timer(struct kvm_vcpu *vcpu) 1318 { 1319 /* 1320 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in 1321 * vcpu_enter_guest. This function is only called from 1322 * the physical CPU that is running vcpu. 1323 */ 1324 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); 1325 } 1326 1327 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) 1328 { 1329 int version; 1330 int r; 1331 struct pvclock_wall_clock wc; 1332 struct timespec64 boot; 1333 1334 if (!wall_clock) 1335 return; 1336 1337 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); 1338 if (r) 1339 return; 1340 1341 if (version & 1) 1342 ++version; /* first time write, random junk */ 1343 1344 ++version; 1345 1346 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version))) 1347 return; 1348 1349 /* 1350 * The guest calculates current wall clock time by adding 1351 * system time (updated by kvm_guest_time_update below) to the 1352 * wall clock specified here. guest system time equals host 1353 * system time for us, thus we must fill in host boot time here. 1354 */ 1355 getboottime64(&boot); 1356 1357 if (kvm->arch.kvmclock_offset) { 1358 struct timespec64 ts = ns_to_timespec64(kvm->arch.kvmclock_offset); 1359 boot = timespec64_sub(boot, ts); 1360 } 1361 wc.sec = (u32)boot.tv_sec; /* overflow in 2106 guest time */ 1362 wc.nsec = boot.tv_nsec; 1363 wc.version = version; 1364 1365 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); 1366 1367 version++; 1368 kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); 1369 } 1370 1371 static uint32_t div_frac(uint32_t dividend, uint32_t divisor) 1372 { 1373 do_shl32_div32(dividend, divisor); 1374 return dividend; 1375 } 1376 1377 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz, 1378 s8 *pshift, u32 *pmultiplier) 1379 { 1380 uint64_t scaled64; 1381 int32_t shift = 0; 1382 uint64_t tps64; 1383 uint32_t tps32; 1384 1385 tps64 = base_hz; 1386 scaled64 = scaled_hz; 1387 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { 1388 tps64 >>= 1; 1389 shift--; 1390 } 1391 1392 tps32 = (uint32_t)tps64; 1393 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { 1394 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) 1395 scaled64 >>= 1; 1396 else 1397 tps32 <<= 1; 1398 shift++; 1399 } 1400 1401 *pshift = shift; 1402 *pmultiplier = div_frac(scaled64, tps32); 1403 1404 pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n", 1405 __func__, base_hz, scaled_hz, shift, *pmultiplier); 1406 } 1407 1408 #ifdef CONFIG_X86_64 1409 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0); 1410 #endif 1411 1412 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); 1413 static unsigned long max_tsc_khz; 1414 1415 static u32 adjust_tsc_khz(u32 khz, s32 ppm) 1416 { 1417 u64 v = (u64)khz * (1000000 + ppm); 1418 do_div(v, 1000000); 1419 return v; 1420 } 1421 1422 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) 1423 { 1424 u64 ratio; 1425 1426 /* Guest TSC same frequency as host TSC? */ 1427 if (!scale) { 1428 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1429 return 0; 1430 } 1431 1432 /* TSC scaling supported? */ 1433 if (!kvm_has_tsc_control) { 1434 if (user_tsc_khz > tsc_khz) { 1435 vcpu->arch.tsc_catchup = 1; 1436 vcpu->arch.tsc_always_catchup = 1; 1437 return 0; 1438 } else { 1439 WARN(1, "user requested TSC rate below hardware speed\n"); 1440 return -1; 1441 } 1442 } 1443 1444 /* TSC scaling required - calculate ratio */ 1445 ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits, 1446 user_tsc_khz, tsc_khz); 1447 1448 if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) { 1449 WARN_ONCE(1, "Invalid TSC scaling ratio - virtual-tsc-khz=%u\n", 1450 user_tsc_khz); 1451 return -1; 1452 } 1453 1454 vcpu->arch.tsc_scaling_ratio = ratio; 1455 return 0; 1456 } 1457 1458 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) 1459 { 1460 u32 thresh_lo, thresh_hi; 1461 int use_scaling = 0; 1462 1463 /* tsc_khz can be zero if TSC calibration fails */ 1464 if (user_tsc_khz == 0) { 1465 /* set tsc_scaling_ratio to a safe value */ 1466 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1467 return -1; 1468 } 1469 1470 /* Compute a scale to convert nanoseconds in TSC cycles */ 1471 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC, 1472 &vcpu->arch.virtual_tsc_shift, 1473 &vcpu->arch.virtual_tsc_mult); 1474 vcpu->arch.virtual_tsc_khz = user_tsc_khz; 1475 1476 /* 1477 * Compute the variation in TSC rate which is acceptable 1478 * within the range of tolerance and decide if the 1479 * rate being applied is within that bounds of the hardware 1480 * rate. If so, no scaling or compensation need be done. 1481 */ 1482 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm); 1483 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm); 1484 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) { 1485 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi); 1486 use_scaling = 1; 1487 } 1488 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling); 1489 } 1490 1491 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) 1492 { 1493 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec, 1494 vcpu->arch.virtual_tsc_mult, 1495 vcpu->arch.virtual_tsc_shift); 1496 tsc += vcpu->arch.this_tsc_write; 1497 return tsc; 1498 } 1499 1500 static inline int gtod_is_based_on_tsc(int mode) 1501 { 1502 return mode == VCLOCK_TSC || mode == VCLOCK_HVCLOCK; 1503 } 1504 1505 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu) 1506 { 1507 #ifdef CONFIG_X86_64 1508 bool vcpus_matched; 1509 struct kvm_arch *ka = &vcpu->kvm->arch; 1510 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1511 1512 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 1513 atomic_read(&vcpu->kvm->online_vcpus)); 1514 1515 /* 1516 * Once the masterclock is enabled, always perform request in 1517 * order to update it. 1518 * 1519 * In order to enable masterclock, the host clocksource must be TSC 1520 * and the vcpus need to have matched TSCs. When that happens, 1521 * perform request to enable masterclock. 1522 */ 1523 if (ka->use_master_clock || 1524 (gtod_is_based_on_tsc(gtod->clock.vclock_mode) && vcpus_matched)) 1525 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 1526 1527 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc, 1528 atomic_read(&vcpu->kvm->online_vcpus), 1529 ka->use_master_clock, gtod->clock.vclock_mode); 1530 #endif 1531 } 1532 1533 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset) 1534 { 1535 u64 curr_offset = kvm_x86_ops->read_l1_tsc_offset(vcpu); 1536 vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset; 1537 } 1538 1539 /* 1540 * Multiply tsc by a fixed point number represented by ratio. 1541 * 1542 * The most significant 64-N bits (mult) of ratio represent the 1543 * integral part of the fixed point number; the remaining N bits 1544 * (frac) represent the fractional part, ie. ratio represents a fixed 1545 * point number (mult + frac * 2^(-N)). 1546 * 1547 * N equals to kvm_tsc_scaling_ratio_frac_bits. 1548 */ 1549 static inline u64 __scale_tsc(u64 ratio, u64 tsc) 1550 { 1551 return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits); 1552 } 1553 1554 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc) 1555 { 1556 u64 _tsc = tsc; 1557 u64 ratio = vcpu->arch.tsc_scaling_ratio; 1558 1559 if (ratio != kvm_default_tsc_scaling_ratio) 1560 _tsc = __scale_tsc(ratio, tsc); 1561 1562 return _tsc; 1563 } 1564 EXPORT_SYMBOL_GPL(kvm_scale_tsc); 1565 1566 static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) 1567 { 1568 u64 tsc; 1569 1570 tsc = kvm_scale_tsc(vcpu, rdtsc()); 1571 1572 return target_tsc - tsc; 1573 } 1574 1575 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc) 1576 { 1577 u64 tsc_offset = kvm_x86_ops->read_l1_tsc_offset(vcpu); 1578 1579 return tsc_offset + kvm_scale_tsc(vcpu, host_tsc); 1580 } 1581 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc); 1582 1583 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) 1584 { 1585 kvm_x86_ops->write_tsc_offset(vcpu, offset); 1586 vcpu->arch.tsc_offset = offset; 1587 } 1588 1589 static inline bool kvm_check_tsc_unstable(void) 1590 { 1591 #ifdef CONFIG_X86_64 1592 /* 1593 * TSC is marked unstable when we're running on Hyper-V, 1594 * 'TSC page' clocksource is good. 1595 */ 1596 if (pvclock_gtod_data.clock.vclock_mode == VCLOCK_HVCLOCK) 1597 return false; 1598 #endif 1599 return check_tsc_unstable(); 1600 } 1601 1602 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr) 1603 { 1604 struct kvm *kvm = vcpu->kvm; 1605 u64 offset, ns, elapsed; 1606 unsigned long flags; 1607 bool matched; 1608 bool already_matched; 1609 u64 data = msr->data; 1610 bool synchronizing = false; 1611 1612 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); 1613 offset = kvm_compute_tsc_offset(vcpu, data); 1614 ns = ktime_get_boot_ns(); 1615 elapsed = ns - kvm->arch.last_tsc_nsec; 1616 1617 if (vcpu->arch.virtual_tsc_khz) { 1618 if (data == 0 && msr->host_initiated) { 1619 /* 1620 * detection of vcpu initialization -- need to sync 1621 * with other vCPUs. This particularly helps to keep 1622 * kvm_clock stable after CPU hotplug 1623 */ 1624 synchronizing = true; 1625 } else { 1626 u64 tsc_exp = kvm->arch.last_tsc_write + 1627 nsec_to_cycles(vcpu, elapsed); 1628 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL; 1629 /* 1630 * Special case: TSC write with a small delta (1 second) 1631 * of virtual cycle time against real time is 1632 * interpreted as an attempt to synchronize the CPU. 1633 */ 1634 synchronizing = data < tsc_exp + tsc_hz && 1635 data + tsc_hz > tsc_exp; 1636 } 1637 } 1638 1639 /* 1640 * For a reliable TSC, we can match TSC offsets, and for an unstable 1641 * TSC, we add elapsed time in this computation. We could let the 1642 * compensation code attempt to catch up if we fall behind, but 1643 * it's better to try to match offsets from the beginning. 1644 */ 1645 if (synchronizing && 1646 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) { 1647 if (!kvm_check_tsc_unstable()) { 1648 offset = kvm->arch.cur_tsc_offset; 1649 pr_debug("kvm: matched tsc offset for %llu\n", data); 1650 } else { 1651 u64 delta = nsec_to_cycles(vcpu, elapsed); 1652 data += delta; 1653 offset = kvm_compute_tsc_offset(vcpu, data); 1654 pr_debug("kvm: adjusted tsc offset by %llu\n", delta); 1655 } 1656 matched = true; 1657 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation); 1658 } else { 1659 /* 1660 * We split periods of matched TSC writes into generations. 1661 * For each generation, we track the original measured 1662 * nanosecond time, offset, and write, so if TSCs are in 1663 * sync, we can match exact offset, and if not, we can match 1664 * exact software computation in compute_guest_tsc() 1665 * 1666 * These values are tracked in kvm->arch.cur_xxx variables. 1667 */ 1668 kvm->arch.cur_tsc_generation++; 1669 kvm->arch.cur_tsc_nsec = ns; 1670 kvm->arch.cur_tsc_write = data; 1671 kvm->arch.cur_tsc_offset = offset; 1672 matched = false; 1673 pr_debug("kvm: new tsc generation %llu, clock %llu\n", 1674 kvm->arch.cur_tsc_generation, data); 1675 } 1676 1677 /* 1678 * We also track th most recent recorded KHZ, write and time to 1679 * allow the matching interval to be extended at each write. 1680 */ 1681 kvm->arch.last_tsc_nsec = ns; 1682 kvm->arch.last_tsc_write = data; 1683 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz; 1684 1685 vcpu->arch.last_guest_tsc = data; 1686 1687 /* Keep track of which generation this VCPU has synchronized to */ 1688 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation; 1689 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec; 1690 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write; 1691 1692 if (!msr->host_initiated && guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) 1693 update_ia32_tsc_adjust_msr(vcpu, offset); 1694 1695 kvm_vcpu_write_tsc_offset(vcpu, offset); 1696 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); 1697 1698 spin_lock(&kvm->arch.pvclock_gtod_sync_lock); 1699 if (!matched) { 1700 kvm->arch.nr_vcpus_matched_tsc = 0; 1701 } else if (!already_matched) { 1702 kvm->arch.nr_vcpus_matched_tsc++; 1703 } 1704 1705 kvm_track_tsc_matching(vcpu); 1706 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock); 1707 } 1708 1709 EXPORT_SYMBOL_GPL(kvm_write_tsc); 1710 1711 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, 1712 s64 adjustment) 1713 { 1714 kvm_vcpu_write_tsc_offset(vcpu, vcpu->arch.tsc_offset + adjustment); 1715 } 1716 1717 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment) 1718 { 1719 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio) 1720 WARN_ON(adjustment < 0); 1721 adjustment = kvm_scale_tsc(vcpu, (u64) adjustment); 1722 adjust_tsc_offset_guest(vcpu, adjustment); 1723 } 1724 1725 #ifdef CONFIG_X86_64 1726 1727 static u64 read_tsc(void) 1728 { 1729 u64 ret = (u64)rdtsc_ordered(); 1730 u64 last = pvclock_gtod_data.clock.cycle_last; 1731 1732 if (likely(ret >= last)) 1733 return ret; 1734 1735 /* 1736 * GCC likes to generate cmov here, but this branch is extremely 1737 * predictable (it's just a function of time and the likely is 1738 * very likely) and there's a data dependence, so force GCC 1739 * to generate a branch instead. I don't barrier() because 1740 * we don't actually need a barrier, and if this function 1741 * ever gets inlined it will generate worse code. 1742 */ 1743 asm volatile (""); 1744 return last; 1745 } 1746 1747 static inline u64 vgettsc(u64 *tsc_timestamp, int *mode) 1748 { 1749 long v; 1750 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1751 u64 tsc_pg_val; 1752 1753 switch (gtod->clock.vclock_mode) { 1754 case VCLOCK_HVCLOCK: 1755 tsc_pg_val = hv_read_tsc_page_tsc(hv_get_tsc_page(), 1756 tsc_timestamp); 1757 if (tsc_pg_val != U64_MAX) { 1758 /* TSC page valid */ 1759 *mode = VCLOCK_HVCLOCK; 1760 v = (tsc_pg_val - gtod->clock.cycle_last) & 1761 gtod->clock.mask; 1762 } else { 1763 /* TSC page invalid */ 1764 *mode = VCLOCK_NONE; 1765 } 1766 break; 1767 case VCLOCK_TSC: 1768 *mode = VCLOCK_TSC; 1769 *tsc_timestamp = read_tsc(); 1770 v = (*tsc_timestamp - gtod->clock.cycle_last) & 1771 gtod->clock.mask; 1772 break; 1773 default: 1774 *mode = VCLOCK_NONE; 1775 } 1776 1777 if (*mode == VCLOCK_NONE) 1778 *tsc_timestamp = v = 0; 1779 1780 return v * gtod->clock.mult; 1781 } 1782 1783 static int do_monotonic_boot(s64 *t, u64 *tsc_timestamp) 1784 { 1785 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1786 unsigned long seq; 1787 int mode; 1788 u64 ns; 1789 1790 do { 1791 seq = read_seqcount_begin(>od->seq); 1792 ns = gtod->nsec_base; 1793 ns += vgettsc(tsc_timestamp, &mode); 1794 ns >>= gtod->clock.shift; 1795 ns += gtod->boot_ns; 1796 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 1797 *t = ns; 1798 1799 return mode; 1800 } 1801 1802 static int do_realtime(struct timespec64 *ts, u64 *tsc_timestamp) 1803 { 1804 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1805 unsigned long seq; 1806 int mode; 1807 u64 ns; 1808 1809 do { 1810 seq = read_seqcount_begin(>od->seq); 1811 ts->tv_sec = gtod->wall_time_sec; 1812 ns = gtod->nsec_base; 1813 ns += vgettsc(tsc_timestamp, &mode); 1814 ns >>= gtod->clock.shift; 1815 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 1816 1817 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns); 1818 ts->tv_nsec = ns; 1819 1820 return mode; 1821 } 1822 1823 /* returns true if host is using TSC based clocksource */ 1824 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp) 1825 { 1826 /* checked again under seqlock below */ 1827 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 1828 return false; 1829 1830 return gtod_is_based_on_tsc(do_monotonic_boot(kernel_ns, 1831 tsc_timestamp)); 1832 } 1833 1834 /* returns true if host is using TSC based clocksource */ 1835 static bool kvm_get_walltime_and_clockread(struct timespec64 *ts, 1836 u64 *tsc_timestamp) 1837 { 1838 /* checked again under seqlock below */ 1839 if (!gtod_is_based_on_tsc(pvclock_gtod_data.clock.vclock_mode)) 1840 return false; 1841 1842 return gtod_is_based_on_tsc(do_realtime(ts, tsc_timestamp)); 1843 } 1844 #endif 1845 1846 /* 1847 * 1848 * Assuming a stable TSC across physical CPUS, and a stable TSC 1849 * across virtual CPUs, the following condition is possible. 1850 * Each numbered line represents an event visible to both 1851 * CPUs at the next numbered event. 1852 * 1853 * "timespecX" represents host monotonic time. "tscX" represents 1854 * RDTSC value. 1855 * 1856 * VCPU0 on CPU0 | VCPU1 on CPU1 1857 * 1858 * 1. read timespec0,tsc0 1859 * 2. | timespec1 = timespec0 + N 1860 * | tsc1 = tsc0 + M 1861 * 3. transition to guest | transition to guest 1862 * 4. ret0 = timespec0 + (rdtsc - tsc0) | 1863 * 5. | ret1 = timespec1 + (rdtsc - tsc1) 1864 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M)) 1865 * 1866 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity: 1867 * 1868 * - ret0 < ret1 1869 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M)) 1870 * ... 1871 * - 0 < N - M => M < N 1872 * 1873 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not 1874 * always the case (the difference between two distinct xtime instances 1875 * might be smaller then the difference between corresponding TSC reads, 1876 * when updating guest vcpus pvclock areas). 1877 * 1878 * To avoid that problem, do not allow visibility of distinct 1879 * system_timestamp/tsc_timestamp values simultaneously: use a master 1880 * copy of host monotonic time values. Update that master copy 1881 * in lockstep. 1882 * 1883 * Rely on synchronization of host TSCs and guest TSCs for monotonicity. 1884 * 1885 */ 1886 1887 static void pvclock_update_vm_gtod_copy(struct kvm *kvm) 1888 { 1889 #ifdef CONFIG_X86_64 1890 struct kvm_arch *ka = &kvm->arch; 1891 int vclock_mode; 1892 bool host_tsc_clocksource, vcpus_matched; 1893 1894 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 1895 atomic_read(&kvm->online_vcpus)); 1896 1897 /* 1898 * If the host uses TSC clock, then passthrough TSC as stable 1899 * to the guest. 1900 */ 1901 host_tsc_clocksource = kvm_get_time_and_clockread( 1902 &ka->master_kernel_ns, 1903 &ka->master_cycle_now); 1904 1905 ka->use_master_clock = host_tsc_clocksource && vcpus_matched 1906 && !ka->backwards_tsc_observed 1907 && !ka->boot_vcpu_runs_old_kvmclock; 1908 1909 if (ka->use_master_clock) 1910 atomic_set(&kvm_guest_has_master_clock, 1); 1911 1912 vclock_mode = pvclock_gtod_data.clock.vclock_mode; 1913 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode, 1914 vcpus_matched); 1915 #endif 1916 } 1917 1918 void kvm_make_mclock_inprogress_request(struct kvm *kvm) 1919 { 1920 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); 1921 } 1922 1923 static void kvm_gen_update_masterclock(struct kvm *kvm) 1924 { 1925 #ifdef CONFIG_X86_64 1926 int i; 1927 struct kvm_vcpu *vcpu; 1928 struct kvm_arch *ka = &kvm->arch; 1929 1930 spin_lock(&ka->pvclock_gtod_sync_lock); 1931 kvm_make_mclock_inprogress_request(kvm); 1932 /* no guest entries from this point */ 1933 pvclock_update_vm_gtod_copy(kvm); 1934 1935 kvm_for_each_vcpu(i, vcpu, kvm) 1936 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 1937 1938 /* guest entries allowed */ 1939 kvm_for_each_vcpu(i, vcpu, kvm) 1940 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 1941 1942 spin_unlock(&ka->pvclock_gtod_sync_lock); 1943 #endif 1944 } 1945 1946 u64 get_kvmclock_ns(struct kvm *kvm) 1947 { 1948 struct kvm_arch *ka = &kvm->arch; 1949 struct pvclock_vcpu_time_info hv_clock; 1950 u64 ret; 1951 1952 spin_lock(&ka->pvclock_gtod_sync_lock); 1953 if (!ka->use_master_clock) { 1954 spin_unlock(&ka->pvclock_gtod_sync_lock); 1955 return ktime_get_boot_ns() + ka->kvmclock_offset; 1956 } 1957 1958 hv_clock.tsc_timestamp = ka->master_cycle_now; 1959 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; 1960 spin_unlock(&ka->pvclock_gtod_sync_lock); 1961 1962 /* both __this_cpu_read() and rdtsc() should be on the same cpu */ 1963 get_cpu(); 1964 1965 if (__this_cpu_read(cpu_tsc_khz)) { 1966 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL, 1967 &hv_clock.tsc_shift, 1968 &hv_clock.tsc_to_system_mul); 1969 ret = __pvclock_read_cycles(&hv_clock, rdtsc()); 1970 } else 1971 ret = ktime_get_boot_ns() + ka->kvmclock_offset; 1972 1973 put_cpu(); 1974 1975 return ret; 1976 } 1977 1978 static void kvm_setup_pvclock_page(struct kvm_vcpu *v) 1979 { 1980 struct kvm_vcpu_arch *vcpu = &v->arch; 1981 struct pvclock_vcpu_time_info guest_hv_clock; 1982 1983 if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time, 1984 &guest_hv_clock, sizeof(guest_hv_clock)))) 1985 return; 1986 1987 /* This VCPU is paused, but it's legal for a guest to read another 1988 * VCPU's kvmclock, so we really have to follow the specification where 1989 * it says that version is odd if data is being modified, and even after 1990 * it is consistent. 1991 * 1992 * Version field updates must be kept separate. This is because 1993 * kvm_write_guest_cached might use a "rep movs" instruction, and 1994 * writes within a string instruction are weakly ordered. So there 1995 * are three writes overall. 1996 * 1997 * As a small optimization, only write the version field in the first 1998 * and third write. The vcpu->pv_time cache is still valid, because the 1999 * version field is the first in the struct. 2000 */ 2001 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0); 2002 2003 if (guest_hv_clock.version & 1) 2004 ++guest_hv_clock.version; /* first time write, random junk */ 2005 2006 vcpu->hv_clock.version = guest_hv_clock.version + 1; 2007 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2008 &vcpu->hv_clock, 2009 sizeof(vcpu->hv_clock.version)); 2010 2011 smp_wmb(); 2012 2013 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */ 2014 vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED); 2015 2016 if (vcpu->pvclock_set_guest_stopped_request) { 2017 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED; 2018 vcpu->pvclock_set_guest_stopped_request = false; 2019 } 2020 2021 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock); 2022 2023 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2024 &vcpu->hv_clock, 2025 sizeof(vcpu->hv_clock)); 2026 2027 smp_wmb(); 2028 2029 vcpu->hv_clock.version++; 2030 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 2031 &vcpu->hv_clock, 2032 sizeof(vcpu->hv_clock.version)); 2033 } 2034 2035 static int kvm_guest_time_update(struct kvm_vcpu *v) 2036 { 2037 unsigned long flags, tgt_tsc_khz; 2038 struct kvm_vcpu_arch *vcpu = &v->arch; 2039 struct kvm_arch *ka = &v->kvm->arch; 2040 s64 kernel_ns; 2041 u64 tsc_timestamp, host_tsc; 2042 u8 pvclock_flags; 2043 bool use_master_clock; 2044 2045 kernel_ns = 0; 2046 host_tsc = 0; 2047 2048 /* 2049 * If the host uses TSC clock, then passthrough TSC as stable 2050 * to the guest. 2051 */ 2052 spin_lock(&ka->pvclock_gtod_sync_lock); 2053 use_master_clock = ka->use_master_clock; 2054 if (use_master_clock) { 2055 host_tsc = ka->master_cycle_now; 2056 kernel_ns = ka->master_kernel_ns; 2057 } 2058 spin_unlock(&ka->pvclock_gtod_sync_lock); 2059 2060 /* Keep irq disabled to prevent changes to the clock */ 2061 local_irq_save(flags); 2062 tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz); 2063 if (unlikely(tgt_tsc_khz == 0)) { 2064 local_irq_restore(flags); 2065 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2066 return 1; 2067 } 2068 if (!use_master_clock) { 2069 host_tsc = rdtsc(); 2070 kernel_ns = ktime_get_boot_ns(); 2071 } 2072 2073 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc); 2074 2075 /* 2076 * We may have to catch up the TSC to match elapsed wall clock 2077 * time for two reasons, even if kvmclock is used. 2078 * 1) CPU could have been running below the maximum TSC rate 2079 * 2) Broken TSC compensation resets the base at each VCPU 2080 * entry to avoid unknown leaps of TSC even when running 2081 * again on the same CPU. This may cause apparent elapsed 2082 * time to disappear, and the guest to stand still or run 2083 * very slowly. 2084 */ 2085 if (vcpu->tsc_catchup) { 2086 u64 tsc = compute_guest_tsc(v, kernel_ns); 2087 if (tsc > tsc_timestamp) { 2088 adjust_tsc_offset_guest(v, tsc - tsc_timestamp); 2089 tsc_timestamp = tsc; 2090 } 2091 } 2092 2093 local_irq_restore(flags); 2094 2095 /* With all the info we got, fill in the values */ 2096 2097 if (kvm_has_tsc_control) 2098 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz); 2099 2100 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) { 2101 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL, 2102 &vcpu->hv_clock.tsc_shift, 2103 &vcpu->hv_clock.tsc_to_system_mul); 2104 vcpu->hw_tsc_khz = tgt_tsc_khz; 2105 } 2106 2107 vcpu->hv_clock.tsc_timestamp = tsc_timestamp; 2108 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; 2109 vcpu->last_guest_tsc = tsc_timestamp; 2110 2111 /* If the host uses TSC clocksource, then it is stable */ 2112 pvclock_flags = 0; 2113 if (use_master_clock) 2114 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT; 2115 2116 vcpu->hv_clock.flags = pvclock_flags; 2117 2118 if (vcpu->pv_time_enabled) 2119 kvm_setup_pvclock_page(v); 2120 if (v == kvm_get_vcpu(v->kvm, 0)) 2121 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock); 2122 return 0; 2123 } 2124 2125 /* 2126 * kvmclock updates which are isolated to a given vcpu, such as 2127 * vcpu->cpu migration, should not allow system_timestamp from 2128 * the rest of the vcpus to remain static. Otherwise ntp frequency 2129 * correction applies to one vcpu's system_timestamp but not 2130 * the others. 2131 * 2132 * So in those cases, request a kvmclock update for all vcpus. 2133 * We need to rate-limit these requests though, as they can 2134 * considerably slow guests that have a large number of vcpus. 2135 * The time for a remote vcpu to update its kvmclock is bound 2136 * by the delay we use to rate-limit the updates. 2137 */ 2138 2139 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100) 2140 2141 static void kvmclock_update_fn(struct work_struct *work) 2142 { 2143 int i; 2144 struct delayed_work *dwork = to_delayed_work(work); 2145 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2146 kvmclock_update_work); 2147 struct kvm *kvm = container_of(ka, struct kvm, arch); 2148 struct kvm_vcpu *vcpu; 2149 2150 kvm_for_each_vcpu(i, vcpu, kvm) { 2151 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2152 kvm_vcpu_kick(vcpu); 2153 } 2154 } 2155 2156 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v) 2157 { 2158 struct kvm *kvm = v->kvm; 2159 2160 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 2161 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 2162 KVMCLOCK_UPDATE_DELAY); 2163 } 2164 2165 #define KVMCLOCK_SYNC_PERIOD (300 * HZ) 2166 2167 static void kvmclock_sync_fn(struct work_struct *work) 2168 { 2169 struct delayed_work *dwork = to_delayed_work(work); 2170 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 2171 kvmclock_sync_work); 2172 struct kvm *kvm = container_of(ka, struct kvm, arch); 2173 2174 if (!kvmclock_periodic_sync) 2175 return; 2176 2177 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0); 2178 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 2179 KVMCLOCK_SYNC_PERIOD); 2180 } 2181 2182 static int set_msr_mce(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2183 { 2184 u64 mcg_cap = vcpu->arch.mcg_cap; 2185 unsigned bank_num = mcg_cap & 0xff; 2186 u32 msr = msr_info->index; 2187 u64 data = msr_info->data; 2188 2189 switch (msr) { 2190 case MSR_IA32_MCG_STATUS: 2191 vcpu->arch.mcg_status = data; 2192 break; 2193 case MSR_IA32_MCG_CTL: 2194 if (!(mcg_cap & MCG_CTL_P) && 2195 (data || !msr_info->host_initiated)) 2196 return 1; 2197 if (data != 0 && data != ~(u64)0) 2198 return 1; 2199 vcpu->arch.mcg_ctl = data; 2200 break; 2201 default: 2202 if (msr >= MSR_IA32_MC0_CTL && 2203 msr < MSR_IA32_MCx_CTL(bank_num)) { 2204 u32 offset = msr - MSR_IA32_MC0_CTL; 2205 /* only 0 or all 1s can be written to IA32_MCi_CTL 2206 * some Linux kernels though clear bit 10 in bank 4 to 2207 * workaround a BIOS/GART TBL issue on AMD K8s, ignore 2208 * this to avoid an uncatched #GP in the guest 2209 */ 2210 if ((offset & 0x3) == 0 && 2211 data != 0 && (data | (1 << 10)) != ~(u64)0) 2212 return -1; 2213 if (!msr_info->host_initiated && 2214 (offset & 0x3) == 1 && data != 0) 2215 return -1; 2216 vcpu->arch.mce_banks[offset] = data; 2217 break; 2218 } 2219 return 1; 2220 } 2221 return 0; 2222 } 2223 2224 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) 2225 { 2226 struct kvm *kvm = vcpu->kvm; 2227 int lm = is_long_mode(vcpu); 2228 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 2229 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; 2230 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 2231 : kvm->arch.xen_hvm_config.blob_size_32; 2232 u32 page_num = data & ~PAGE_MASK; 2233 u64 page_addr = data & PAGE_MASK; 2234 u8 *page; 2235 int r; 2236 2237 r = -E2BIG; 2238 if (page_num >= blob_size) 2239 goto out; 2240 r = -ENOMEM; 2241 page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE); 2242 if (IS_ERR(page)) { 2243 r = PTR_ERR(page); 2244 goto out; 2245 } 2246 if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) 2247 goto out_free; 2248 r = 0; 2249 out_free: 2250 kfree(page); 2251 out: 2252 return r; 2253 } 2254 2255 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) 2256 { 2257 gpa_t gpa = data & ~0x3f; 2258 2259 /* Bits 3:5 are reserved, Should be zero */ 2260 if (data & 0x38) 2261 return 1; 2262 2263 vcpu->arch.apf.msr_val = data; 2264 2265 if (!(data & KVM_ASYNC_PF_ENABLED)) { 2266 kvm_clear_async_pf_completion_queue(vcpu); 2267 kvm_async_pf_hash_reset(vcpu); 2268 return 0; 2269 } 2270 2271 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa, 2272 sizeof(u32))) 2273 return 1; 2274 2275 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); 2276 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT; 2277 kvm_async_pf_wakeup_all(vcpu); 2278 return 0; 2279 } 2280 2281 static void kvmclock_reset(struct kvm_vcpu *vcpu) 2282 { 2283 vcpu->arch.pv_time_enabled = false; 2284 } 2285 2286 static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa) 2287 { 2288 ++vcpu->stat.tlb_flush; 2289 kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa); 2290 } 2291 2292 static void record_steal_time(struct kvm_vcpu *vcpu) 2293 { 2294 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 2295 return; 2296 2297 if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2298 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)))) 2299 return; 2300 2301 /* 2302 * Doing a TLB flush here, on the guest's behalf, can avoid 2303 * expensive IPIs. 2304 */ 2305 if (xchg(&vcpu->arch.st.steal.preempted, 0) & KVM_VCPU_FLUSH_TLB) 2306 kvm_vcpu_flush_tlb(vcpu, false); 2307 2308 if (vcpu->arch.st.steal.version & 1) 2309 vcpu->arch.st.steal.version += 1; /* first time write, random junk */ 2310 2311 vcpu->arch.st.steal.version += 1; 2312 2313 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2314 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2315 2316 smp_wmb(); 2317 2318 vcpu->arch.st.steal.steal += current->sched_info.run_delay - 2319 vcpu->arch.st.last_steal; 2320 vcpu->arch.st.last_steal = current->sched_info.run_delay; 2321 2322 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2323 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2324 2325 smp_wmb(); 2326 2327 vcpu->arch.st.steal.version += 1; 2328 2329 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2330 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2331 } 2332 2333 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2334 { 2335 bool pr = false; 2336 u32 msr = msr_info->index; 2337 u64 data = msr_info->data; 2338 2339 switch (msr) { 2340 case MSR_AMD64_NB_CFG: 2341 case MSR_IA32_UCODE_WRITE: 2342 case MSR_VM_HSAVE_PA: 2343 case MSR_AMD64_PATCH_LOADER: 2344 case MSR_AMD64_BU_CFG2: 2345 case MSR_AMD64_DC_CFG: 2346 break; 2347 2348 case MSR_IA32_UCODE_REV: 2349 if (msr_info->host_initiated) 2350 vcpu->arch.microcode_version = data; 2351 break; 2352 case MSR_EFER: 2353 return set_efer(vcpu, data); 2354 case MSR_K7_HWCR: 2355 data &= ~(u64)0x40; /* ignore flush filter disable */ 2356 data &= ~(u64)0x100; /* ignore ignne emulation enable */ 2357 data &= ~(u64)0x8; /* ignore TLB cache disable */ 2358 data &= ~(u64)0x40000; /* ignore Mc status write enable */ 2359 if (data != 0) { 2360 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", 2361 data); 2362 return 1; 2363 } 2364 break; 2365 case MSR_FAM10H_MMIO_CONF_BASE: 2366 if (data != 0) { 2367 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " 2368 "0x%llx\n", data); 2369 return 1; 2370 } 2371 break; 2372 case MSR_IA32_DEBUGCTLMSR: 2373 if (!data) { 2374 /* We support the non-activated case already */ 2375 break; 2376 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { 2377 /* Values other than LBR and BTF are vendor-specific, 2378 thus reserved and should throw a #GP */ 2379 return 1; 2380 } 2381 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", 2382 __func__, data); 2383 break; 2384 case 0x200 ... 0x2ff: 2385 return kvm_mtrr_set_msr(vcpu, msr, data); 2386 case MSR_IA32_APICBASE: 2387 return kvm_set_apic_base(vcpu, msr_info); 2388 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2389 return kvm_x2apic_msr_write(vcpu, msr, data); 2390 case MSR_IA32_TSCDEADLINE: 2391 kvm_set_lapic_tscdeadline_msr(vcpu, data); 2392 break; 2393 case MSR_IA32_TSC_ADJUST: 2394 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) { 2395 if (!msr_info->host_initiated) { 2396 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr; 2397 adjust_tsc_offset_guest(vcpu, adj); 2398 } 2399 vcpu->arch.ia32_tsc_adjust_msr = data; 2400 } 2401 break; 2402 case MSR_IA32_MISC_ENABLE: 2403 vcpu->arch.ia32_misc_enable_msr = data; 2404 break; 2405 case MSR_IA32_SMBASE: 2406 if (!msr_info->host_initiated) 2407 return 1; 2408 vcpu->arch.smbase = data; 2409 break; 2410 case MSR_IA32_TSC: 2411 kvm_write_tsc(vcpu, msr_info); 2412 break; 2413 case MSR_SMI_COUNT: 2414 if (!msr_info->host_initiated) 2415 return 1; 2416 vcpu->arch.smi_count = data; 2417 break; 2418 case MSR_KVM_WALL_CLOCK_NEW: 2419 case MSR_KVM_WALL_CLOCK: 2420 vcpu->kvm->arch.wall_clock = data; 2421 kvm_write_wall_clock(vcpu->kvm, data); 2422 break; 2423 case MSR_KVM_SYSTEM_TIME_NEW: 2424 case MSR_KVM_SYSTEM_TIME: { 2425 struct kvm_arch *ka = &vcpu->kvm->arch; 2426 2427 kvmclock_reset(vcpu); 2428 2429 if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) { 2430 bool tmp = (msr == MSR_KVM_SYSTEM_TIME); 2431 2432 if (ka->boot_vcpu_runs_old_kvmclock != tmp) 2433 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 2434 2435 ka->boot_vcpu_runs_old_kvmclock = tmp; 2436 } 2437 2438 vcpu->arch.time = data; 2439 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 2440 2441 /* we verify if the enable bit is set... */ 2442 if (!(data & 1)) 2443 break; 2444 2445 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, 2446 &vcpu->arch.pv_time, data & ~1ULL, 2447 sizeof(struct pvclock_vcpu_time_info))) 2448 vcpu->arch.pv_time_enabled = false; 2449 else 2450 vcpu->arch.pv_time_enabled = true; 2451 2452 break; 2453 } 2454 case MSR_KVM_ASYNC_PF_EN: 2455 if (kvm_pv_enable_async_pf(vcpu, data)) 2456 return 1; 2457 break; 2458 case MSR_KVM_STEAL_TIME: 2459 2460 if (unlikely(!sched_info_on())) 2461 return 1; 2462 2463 if (data & KVM_STEAL_RESERVED_MASK) 2464 return 1; 2465 2466 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime, 2467 data & KVM_STEAL_VALID_BITS, 2468 sizeof(struct kvm_steal_time))) 2469 return 1; 2470 2471 vcpu->arch.st.msr_val = data; 2472 2473 if (!(data & KVM_MSR_ENABLED)) 2474 break; 2475 2476 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 2477 2478 break; 2479 case MSR_KVM_PV_EOI_EN: 2480 if (kvm_lapic_enable_pv_eoi(vcpu, data)) 2481 return 1; 2482 break; 2483 2484 case MSR_IA32_MCG_CTL: 2485 case MSR_IA32_MCG_STATUS: 2486 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 2487 return set_msr_mce(vcpu, msr_info); 2488 2489 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2490 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2491 pr = true; /* fall through */ 2492 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2493 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2494 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2495 return kvm_pmu_set_msr(vcpu, msr_info); 2496 2497 if (pr || data != 0) 2498 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: " 2499 "0x%x data 0x%llx\n", msr, data); 2500 break; 2501 case MSR_K7_CLK_CTL: 2502 /* 2503 * Ignore all writes to this no longer documented MSR. 2504 * Writes are only relevant for old K7 processors, 2505 * all pre-dating SVM, but a recommended workaround from 2506 * AMD for these chips. It is possible to specify the 2507 * affected processor models on the command line, hence 2508 * the need to ignore the workaround. 2509 */ 2510 break; 2511 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 2512 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 2513 case HV_X64_MSR_CRASH_CTL: 2514 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 2515 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 2516 case HV_X64_MSR_TSC_EMULATION_CONTROL: 2517 case HV_X64_MSR_TSC_EMULATION_STATUS: 2518 return kvm_hv_set_msr_common(vcpu, msr, data, 2519 msr_info->host_initiated); 2520 case MSR_IA32_BBL_CR_CTL3: 2521 /* Drop writes to this legacy MSR -- see rdmsr 2522 * counterpart for further detail. 2523 */ 2524 if (report_ignored_msrs) 2525 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", 2526 msr, data); 2527 break; 2528 case MSR_AMD64_OSVW_ID_LENGTH: 2529 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2530 return 1; 2531 vcpu->arch.osvw.length = data; 2532 break; 2533 case MSR_AMD64_OSVW_STATUS: 2534 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2535 return 1; 2536 vcpu->arch.osvw.status = data; 2537 break; 2538 case MSR_PLATFORM_INFO: 2539 if (!msr_info->host_initiated || 2540 data & ~MSR_PLATFORM_INFO_CPUID_FAULT || 2541 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) && 2542 cpuid_fault_enabled(vcpu))) 2543 return 1; 2544 vcpu->arch.msr_platform_info = data; 2545 break; 2546 case MSR_MISC_FEATURES_ENABLES: 2547 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT || 2548 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT && 2549 !supports_cpuid_fault(vcpu))) 2550 return 1; 2551 vcpu->arch.msr_misc_features_enables = data; 2552 break; 2553 default: 2554 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) 2555 return xen_hvm_config(vcpu, data); 2556 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2557 return kvm_pmu_set_msr(vcpu, msr_info); 2558 if (!ignore_msrs) { 2559 vcpu_debug_ratelimited(vcpu, "unhandled wrmsr: 0x%x data 0x%llx\n", 2560 msr, data); 2561 return 1; 2562 } else { 2563 if (report_ignored_msrs) 2564 vcpu_unimpl(vcpu, 2565 "ignored wrmsr: 0x%x data 0x%llx\n", 2566 msr, data); 2567 break; 2568 } 2569 } 2570 return 0; 2571 } 2572 EXPORT_SYMBOL_GPL(kvm_set_msr_common); 2573 2574 2575 /* 2576 * Reads an msr value (of 'msr_index') into 'pdata'. 2577 * Returns 0 on success, non-0 otherwise. 2578 * Assumes vcpu_load() was already called. 2579 */ 2580 int kvm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) 2581 { 2582 return kvm_x86_ops->get_msr(vcpu, msr); 2583 } 2584 EXPORT_SYMBOL_GPL(kvm_get_msr); 2585 2586 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) 2587 { 2588 u64 data; 2589 u64 mcg_cap = vcpu->arch.mcg_cap; 2590 unsigned bank_num = mcg_cap & 0xff; 2591 2592 switch (msr) { 2593 case MSR_IA32_P5_MC_ADDR: 2594 case MSR_IA32_P5_MC_TYPE: 2595 data = 0; 2596 break; 2597 case MSR_IA32_MCG_CAP: 2598 data = vcpu->arch.mcg_cap; 2599 break; 2600 case MSR_IA32_MCG_CTL: 2601 if (!(mcg_cap & MCG_CTL_P) && !host) 2602 return 1; 2603 data = vcpu->arch.mcg_ctl; 2604 break; 2605 case MSR_IA32_MCG_STATUS: 2606 data = vcpu->arch.mcg_status; 2607 break; 2608 default: 2609 if (msr >= MSR_IA32_MC0_CTL && 2610 msr < MSR_IA32_MCx_CTL(bank_num)) { 2611 u32 offset = msr - MSR_IA32_MC0_CTL; 2612 data = vcpu->arch.mce_banks[offset]; 2613 break; 2614 } 2615 return 1; 2616 } 2617 *pdata = data; 2618 return 0; 2619 } 2620 2621 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2622 { 2623 switch (msr_info->index) { 2624 case MSR_IA32_PLATFORM_ID: 2625 case MSR_IA32_EBL_CR_POWERON: 2626 case MSR_IA32_DEBUGCTLMSR: 2627 case MSR_IA32_LASTBRANCHFROMIP: 2628 case MSR_IA32_LASTBRANCHTOIP: 2629 case MSR_IA32_LASTINTFROMIP: 2630 case MSR_IA32_LASTINTTOIP: 2631 case MSR_K8_SYSCFG: 2632 case MSR_K8_TSEG_ADDR: 2633 case MSR_K8_TSEG_MASK: 2634 case MSR_K7_HWCR: 2635 case MSR_VM_HSAVE_PA: 2636 case MSR_K8_INT_PENDING_MSG: 2637 case MSR_AMD64_NB_CFG: 2638 case MSR_FAM10H_MMIO_CONF_BASE: 2639 case MSR_AMD64_BU_CFG2: 2640 case MSR_IA32_PERF_CTL: 2641 case MSR_AMD64_DC_CFG: 2642 msr_info->data = 0; 2643 break; 2644 case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5: 2645 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2646 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2647 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2648 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2649 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 2650 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 2651 msr_info->data = 0; 2652 break; 2653 case MSR_IA32_UCODE_REV: 2654 msr_info->data = vcpu->arch.microcode_version; 2655 break; 2656 case MSR_IA32_TSC: 2657 msr_info->data = kvm_scale_tsc(vcpu, rdtsc()) + vcpu->arch.tsc_offset; 2658 break; 2659 case MSR_MTRRcap: 2660 case 0x200 ... 0x2ff: 2661 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data); 2662 case 0xcd: /* fsb frequency */ 2663 msr_info->data = 3; 2664 break; 2665 /* 2666 * MSR_EBC_FREQUENCY_ID 2667 * Conservative value valid for even the basic CPU models. 2668 * Models 0,1: 000 in bits 23:21 indicating a bus speed of 2669 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, 2670 * and 266MHz for model 3, or 4. Set Core Clock 2671 * Frequency to System Bus Frequency Ratio to 1 (bits 2672 * 31:24) even though these are only valid for CPU 2673 * models > 2, however guests may end up dividing or 2674 * multiplying by zero otherwise. 2675 */ 2676 case MSR_EBC_FREQUENCY_ID: 2677 msr_info->data = 1 << 24; 2678 break; 2679 case MSR_IA32_APICBASE: 2680 msr_info->data = kvm_get_apic_base(vcpu); 2681 break; 2682 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2683 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data); 2684 break; 2685 case MSR_IA32_TSCDEADLINE: 2686 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu); 2687 break; 2688 case MSR_IA32_TSC_ADJUST: 2689 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr; 2690 break; 2691 case MSR_IA32_MISC_ENABLE: 2692 msr_info->data = vcpu->arch.ia32_misc_enable_msr; 2693 break; 2694 case MSR_IA32_SMBASE: 2695 if (!msr_info->host_initiated) 2696 return 1; 2697 msr_info->data = vcpu->arch.smbase; 2698 break; 2699 case MSR_SMI_COUNT: 2700 msr_info->data = vcpu->arch.smi_count; 2701 break; 2702 case MSR_IA32_PERF_STATUS: 2703 /* TSC increment by tick */ 2704 msr_info->data = 1000ULL; 2705 /* CPU multiplier */ 2706 msr_info->data |= (((uint64_t)4ULL) << 40); 2707 break; 2708 case MSR_EFER: 2709 msr_info->data = vcpu->arch.efer; 2710 break; 2711 case MSR_KVM_WALL_CLOCK: 2712 case MSR_KVM_WALL_CLOCK_NEW: 2713 msr_info->data = vcpu->kvm->arch.wall_clock; 2714 break; 2715 case MSR_KVM_SYSTEM_TIME: 2716 case MSR_KVM_SYSTEM_TIME_NEW: 2717 msr_info->data = vcpu->arch.time; 2718 break; 2719 case MSR_KVM_ASYNC_PF_EN: 2720 msr_info->data = vcpu->arch.apf.msr_val; 2721 break; 2722 case MSR_KVM_STEAL_TIME: 2723 msr_info->data = vcpu->arch.st.msr_val; 2724 break; 2725 case MSR_KVM_PV_EOI_EN: 2726 msr_info->data = vcpu->arch.pv_eoi.msr_val; 2727 break; 2728 case MSR_IA32_P5_MC_ADDR: 2729 case MSR_IA32_P5_MC_TYPE: 2730 case MSR_IA32_MCG_CAP: 2731 case MSR_IA32_MCG_CTL: 2732 case MSR_IA32_MCG_STATUS: 2733 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 2734 return get_msr_mce(vcpu, msr_info->index, &msr_info->data, 2735 msr_info->host_initiated); 2736 case MSR_K7_CLK_CTL: 2737 /* 2738 * Provide expected ramp-up count for K7. All other 2739 * are set to zero, indicating minimum divisors for 2740 * every field. 2741 * 2742 * This prevents guest kernels on AMD host with CPU 2743 * type 6, model 8 and higher from exploding due to 2744 * the rdmsr failing. 2745 */ 2746 msr_info->data = 0x20000000; 2747 break; 2748 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 2749 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 2750 case HV_X64_MSR_CRASH_CTL: 2751 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 2752 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 2753 case HV_X64_MSR_TSC_EMULATION_CONTROL: 2754 case HV_X64_MSR_TSC_EMULATION_STATUS: 2755 return kvm_hv_get_msr_common(vcpu, 2756 msr_info->index, &msr_info->data, 2757 msr_info->host_initiated); 2758 break; 2759 case MSR_IA32_BBL_CR_CTL3: 2760 /* This legacy MSR exists but isn't fully documented in current 2761 * silicon. It is however accessed by winxp in very narrow 2762 * scenarios where it sets bit #19, itself documented as 2763 * a "reserved" bit. Best effort attempt to source coherent 2764 * read data here should the balance of the register be 2765 * interpreted by the guest: 2766 * 2767 * L2 cache control register 3: 64GB range, 256KB size, 2768 * enabled, latency 0x1, configured 2769 */ 2770 msr_info->data = 0xbe702111; 2771 break; 2772 case MSR_AMD64_OSVW_ID_LENGTH: 2773 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2774 return 1; 2775 msr_info->data = vcpu->arch.osvw.length; 2776 break; 2777 case MSR_AMD64_OSVW_STATUS: 2778 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW)) 2779 return 1; 2780 msr_info->data = vcpu->arch.osvw.status; 2781 break; 2782 case MSR_PLATFORM_INFO: 2783 msr_info->data = vcpu->arch.msr_platform_info; 2784 break; 2785 case MSR_MISC_FEATURES_ENABLES: 2786 msr_info->data = vcpu->arch.msr_misc_features_enables; 2787 break; 2788 default: 2789 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 2790 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 2791 if (!ignore_msrs) { 2792 vcpu_debug_ratelimited(vcpu, "unhandled rdmsr: 0x%x\n", 2793 msr_info->index); 2794 return 1; 2795 } else { 2796 if (report_ignored_msrs) 2797 vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", 2798 msr_info->index); 2799 msr_info->data = 0; 2800 } 2801 break; 2802 } 2803 return 0; 2804 } 2805 EXPORT_SYMBOL_GPL(kvm_get_msr_common); 2806 2807 /* 2808 * Read or write a bunch of msrs. All parameters are kernel addresses. 2809 * 2810 * @return number of msrs set successfully. 2811 */ 2812 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, 2813 struct kvm_msr_entry *entries, 2814 int (*do_msr)(struct kvm_vcpu *vcpu, 2815 unsigned index, u64 *data)) 2816 { 2817 int i; 2818 2819 for (i = 0; i < msrs->nmsrs; ++i) 2820 if (do_msr(vcpu, entries[i].index, &entries[i].data)) 2821 break; 2822 2823 return i; 2824 } 2825 2826 /* 2827 * Read or write a bunch of msrs. Parameters are user addresses. 2828 * 2829 * @return number of msrs set successfully. 2830 */ 2831 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, 2832 int (*do_msr)(struct kvm_vcpu *vcpu, 2833 unsigned index, u64 *data), 2834 int writeback) 2835 { 2836 struct kvm_msrs msrs; 2837 struct kvm_msr_entry *entries; 2838 int r, n; 2839 unsigned size; 2840 2841 r = -EFAULT; 2842 if (copy_from_user(&msrs, user_msrs, sizeof msrs)) 2843 goto out; 2844 2845 r = -E2BIG; 2846 if (msrs.nmsrs >= MAX_IO_MSRS) 2847 goto out; 2848 2849 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; 2850 entries = memdup_user(user_msrs->entries, size); 2851 if (IS_ERR(entries)) { 2852 r = PTR_ERR(entries); 2853 goto out; 2854 } 2855 2856 r = n = __msr_io(vcpu, &msrs, entries, do_msr); 2857 if (r < 0) 2858 goto out_free; 2859 2860 r = -EFAULT; 2861 if (writeback && copy_to_user(user_msrs->entries, entries, size)) 2862 goto out_free; 2863 2864 r = n; 2865 2866 out_free: 2867 kfree(entries); 2868 out: 2869 return r; 2870 } 2871 2872 static inline bool kvm_can_mwait_in_guest(void) 2873 { 2874 return boot_cpu_has(X86_FEATURE_MWAIT) && 2875 !boot_cpu_has_bug(X86_BUG_MONITOR) && 2876 boot_cpu_has(X86_FEATURE_ARAT); 2877 } 2878 2879 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 2880 { 2881 int r = 0; 2882 2883 switch (ext) { 2884 case KVM_CAP_IRQCHIP: 2885 case KVM_CAP_HLT: 2886 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: 2887 case KVM_CAP_SET_TSS_ADDR: 2888 case KVM_CAP_EXT_CPUID: 2889 case KVM_CAP_EXT_EMUL_CPUID: 2890 case KVM_CAP_CLOCKSOURCE: 2891 case KVM_CAP_PIT: 2892 case KVM_CAP_NOP_IO_DELAY: 2893 case KVM_CAP_MP_STATE: 2894 case KVM_CAP_SYNC_MMU: 2895 case KVM_CAP_USER_NMI: 2896 case KVM_CAP_REINJECT_CONTROL: 2897 case KVM_CAP_IRQ_INJECT_STATUS: 2898 case KVM_CAP_IOEVENTFD: 2899 case KVM_CAP_IOEVENTFD_NO_LENGTH: 2900 case KVM_CAP_PIT2: 2901 case KVM_CAP_PIT_STATE2: 2902 case KVM_CAP_SET_IDENTITY_MAP_ADDR: 2903 case KVM_CAP_XEN_HVM: 2904 case KVM_CAP_VCPU_EVENTS: 2905 case KVM_CAP_HYPERV: 2906 case KVM_CAP_HYPERV_VAPIC: 2907 case KVM_CAP_HYPERV_SPIN: 2908 case KVM_CAP_HYPERV_SYNIC: 2909 case KVM_CAP_HYPERV_SYNIC2: 2910 case KVM_CAP_HYPERV_VP_INDEX: 2911 case KVM_CAP_HYPERV_EVENTFD: 2912 case KVM_CAP_HYPERV_TLBFLUSH: 2913 case KVM_CAP_PCI_SEGMENT: 2914 case KVM_CAP_DEBUGREGS: 2915 case KVM_CAP_X86_ROBUST_SINGLESTEP: 2916 case KVM_CAP_XSAVE: 2917 case KVM_CAP_ASYNC_PF: 2918 case KVM_CAP_GET_TSC_KHZ: 2919 case KVM_CAP_KVMCLOCK_CTRL: 2920 case KVM_CAP_READONLY_MEM: 2921 case KVM_CAP_HYPERV_TIME: 2922 case KVM_CAP_IOAPIC_POLARITY_IGNORED: 2923 case KVM_CAP_TSC_DEADLINE_TIMER: 2924 case KVM_CAP_ENABLE_CAP_VM: 2925 case KVM_CAP_DISABLE_QUIRKS: 2926 case KVM_CAP_SET_BOOT_CPU_ID: 2927 case KVM_CAP_SPLIT_IRQCHIP: 2928 case KVM_CAP_IMMEDIATE_EXIT: 2929 case KVM_CAP_GET_MSR_FEATURES: 2930 r = 1; 2931 break; 2932 case KVM_CAP_SYNC_REGS: 2933 r = KVM_SYNC_X86_VALID_FIELDS; 2934 break; 2935 case KVM_CAP_ADJUST_CLOCK: 2936 r = KVM_CLOCK_TSC_STABLE; 2937 break; 2938 case KVM_CAP_X86_DISABLE_EXITS: 2939 r |= KVM_X86_DISABLE_EXITS_HLT | KVM_X86_DISABLE_EXITS_PAUSE; 2940 if(kvm_can_mwait_in_guest()) 2941 r |= KVM_X86_DISABLE_EXITS_MWAIT; 2942 break; 2943 case KVM_CAP_X86_SMM: 2944 /* SMBASE is usually relocated above 1M on modern chipsets, 2945 * and SMM handlers might indeed rely on 4G segment limits, 2946 * so do not report SMM to be available if real mode is 2947 * emulated via vm86 mode. Still, do not go to great lengths 2948 * to avoid userspace's usage of the feature, because it is a 2949 * fringe case that is not enabled except via specific settings 2950 * of the module parameters. 2951 */ 2952 r = kvm_x86_ops->has_emulated_msr(MSR_IA32_SMBASE); 2953 break; 2954 case KVM_CAP_VAPIC: 2955 r = !kvm_x86_ops->cpu_has_accelerated_tpr(); 2956 break; 2957 case KVM_CAP_NR_VCPUS: 2958 r = KVM_SOFT_MAX_VCPUS; 2959 break; 2960 case KVM_CAP_MAX_VCPUS: 2961 r = KVM_MAX_VCPUS; 2962 break; 2963 case KVM_CAP_NR_MEMSLOTS: 2964 r = KVM_USER_MEM_SLOTS; 2965 break; 2966 case KVM_CAP_PV_MMU: /* obsolete */ 2967 r = 0; 2968 break; 2969 case KVM_CAP_MCE: 2970 r = KVM_MAX_MCE_BANKS; 2971 break; 2972 case KVM_CAP_XCRS: 2973 r = boot_cpu_has(X86_FEATURE_XSAVE); 2974 break; 2975 case KVM_CAP_TSC_CONTROL: 2976 r = kvm_has_tsc_control; 2977 break; 2978 case KVM_CAP_X2APIC_API: 2979 r = KVM_X2APIC_API_VALID_FLAGS; 2980 break; 2981 case KVM_CAP_NESTED_STATE: 2982 r = kvm_x86_ops->get_nested_state ? 2983 kvm_x86_ops->get_nested_state(NULL, 0, 0) : 0; 2984 break; 2985 default: 2986 break; 2987 } 2988 return r; 2989 2990 } 2991 2992 long kvm_arch_dev_ioctl(struct file *filp, 2993 unsigned int ioctl, unsigned long arg) 2994 { 2995 void __user *argp = (void __user *)arg; 2996 long r; 2997 2998 switch (ioctl) { 2999 case KVM_GET_MSR_INDEX_LIST: { 3000 struct kvm_msr_list __user *user_msr_list = argp; 3001 struct kvm_msr_list msr_list; 3002 unsigned n; 3003 3004 r = -EFAULT; 3005 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) 3006 goto out; 3007 n = msr_list.nmsrs; 3008 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs; 3009 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) 3010 goto out; 3011 r = -E2BIG; 3012 if (n < msr_list.nmsrs) 3013 goto out; 3014 r = -EFAULT; 3015 if (copy_to_user(user_msr_list->indices, &msrs_to_save, 3016 num_msrs_to_save * sizeof(u32))) 3017 goto out; 3018 if (copy_to_user(user_msr_list->indices + num_msrs_to_save, 3019 &emulated_msrs, 3020 num_emulated_msrs * sizeof(u32))) 3021 goto out; 3022 r = 0; 3023 break; 3024 } 3025 case KVM_GET_SUPPORTED_CPUID: 3026 case KVM_GET_EMULATED_CPUID: { 3027 struct kvm_cpuid2 __user *cpuid_arg = argp; 3028 struct kvm_cpuid2 cpuid; 3029 3030 r = -EFAULT; 3031 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3032 goto out; 3033 3034 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries, 3035 ioctl); 3036 if (r) 3037 goto out; 3038 3039 r = -EFAULT; 3040 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) 3041 goto out; 3042 r = 0; 3043 break; 3044 } 3045 case KVM_X86_GET_MCE_CAP_SUPPORTED: { 3046 r = -EFAULT; 3047 if (copy_to_user(argp, &kvm_mce_cap_supported, 3048 sizeof(kvm_mce_cap_supported))) 3049 goto out; 3050 r = 0; 3051 break; 3052 case KVM_GET_MSR_FEATURE_INDEX_LIST: { 3053 struct kvm_msr_list __user *user_msr_list = argp; 3054 struct kvm_msr_list msr_list; 3055 unsigned int n; 3056 3057 r = -EFAULT; 3058 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list))) 3059 goto out; 3060 n = msr_list.nmsrs; 3061 msr_list.nmsrs = num_msr_based_features; 3062 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list))) 3063 goto out; 3064 r = -E2BIG; 3065 if (n < msr_list.nmsrs) 3066 goto out; 3067 r = -EFAULT; 3068 if (copy_to_user(user_msr_list->indices, &msr_based_features, 3069 num_msr_based_features * sizeof(u32))) 3070 goto out; 3071 r = 0; 3072 break; 3073 } 3074 case KVM_GET_MSRS: 3075 r = msr_io(NULL, argp, do_get_msr_feature, 1); 3076 break; 3077 } 3078 default: 3079 r = -EINVAL; 3080 } 3081 out: 3082 return r; 3083 } 3084 3085 static void wbinvd_ipi(void *garbage) 3086 { 3087 wbinvd(); 3088 } 3089 3090 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) 3091 { 3092 return kvm_arch_has_noncoherent_dma(vcpu->kvm); 3093 } 3094 3095 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3096 { 3097 /* Address WBINVD may be executed by guest */ 3098 if (need_emulate_wbinvd(vcpu)) { 3099 if (kvm_x86_ops->has_wbinvd_exit()) 3100 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 3101 else if (vcpu->cpu != -1 && vcpu->cpu != cpu) 3102 smp_call_function_single(vcpu->cpu, 3103 wbinvd_ipi, NULL, 1); 3104 } 3105 3106 kvm_x86_ops->vcpu_load(vcpu, cpu); 3107 3108 /* Apply any externally detected TSC adjustments (due to suspend) */ 3109 if (unlikely(vcpu->arch.tsc_offset_adjustment)) { 3110 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment); 3111 vcpu->arch.tsc_offset_adjustment = 0; 3112 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 3113 } 3114 3115 if (unlikely(vcpu->cpu != cpu) || kvm_check_tsc_unstable()) { 3116 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 : 3117 rdtsc() - vcpu->arch.last_host_tsc; 3118 if (tsc_delta < 0) 3119 mark_tsc_unstable("KVM discovered backwards TSC"); 3120 3121 if (kvm_check_tsc_unstable()) { 3122 u64 offset = kvm_compute_tsc_offset(vcpu, 3123 vcpu->arch.last_guest_tsc); 3124 kvm_vcpu_write_tsc_offset(vcpu, offset); 3125 vcpu->arch.tsc_catchup = 1; 3126 } 3127 3128 if (kvm_lapic_hv_timer_in_use(vcpu)) 3129 kvm_lapic_restart_hv_timer(vcpu); 3130 3131 /* 3132 * On a host with synchronized TSC, there is no need to update 3133 * kvmclock on vcpu->cpu migration 3134 */ 3135 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1) 3136 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 3137 if (vcpu->cpu != cpu) 3138 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu); 3139 vcpu->cpu = cpu; 3140 } 3141 3142 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 3143 } 3144 3145 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) 3146 { 3147 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 3148 return; 3149 3150 vcpu->arch.st.steal.preempted = KVM_VCPU_PREEMPTED; 3151 3152 kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime, 3153 &vcpu->arch.st.steal.preempted, 3154 offsetof(struct kvm_steal_time, preempted), 3155 sizeof(vcpu->arch.st.steal.preempted)); 3156 } 3157 3158 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 3159 { 3160 int idx; 3161 3162 if (vcpu->preempted) 3163 vcpu->arch.preempted_in_kernel = !kvm_x86_ops->get_cpl(vcpu); 3164 3165 /* 3166 * Disable page faults because we're in atomic context here. 3167 * kvm_write_guest_offset_cached() would call might_fault() 3168 * that relies on pagefault_disable() to tell if there's a 3169 * bug. NOTE: the write to guest memory may not go through if 3170 * during postcopy live migration or if there's heavy guest 3171 * paging. 3172 */ 3173 pagefault_disable(); 3174 /* 3175 * kvm_memslots() will be called by 3176 * kvm_write_guest_offset_cached() so take the srcu lock. 3177 */ 3178 idx = srcu_read_lock(&vcpu->kvm->srcu); 3179 kvm_steal_time_set_preempted(vcpu); 3180 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3181 pagefault_enable(); 3182 kvm_x86_ops->vcpu_put(vcpu); 3183 vcpu->arch.last_host_tsc = rdtsc(); 3184 /* 3185 * If userspace has set any breakpoints or watchpoints, dr6 is restored 3186 * on every vmexit, but if not, we might have a stale dr6 from the 3187 * guest. do_debug expects dr6 to be cleared after it runs, do the same. 3188 */ 3189 set_debugreg(0, 6); 3190 } 3191 3192 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, 3193 struct kvm_lapic_state *s) 3194 { 3195 if (vcpu->arch.apicv_active) 3196 kvm_x86_ops->sync_pir_to_irr(vcpu); 3197 3198 return kvm_apic_get_state(vcpu, s); 3199 } 3200 3201 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, 3202 struct kvm_lapic_state *s) 3203 { 3204 int r; 3205 3206 r = kvm_apic_set_state(vcpu, s); 3207 if (r) 3208 return r; 3209 update_cr8_intercept(vcpu); 3210 3211 return 0; 3212 } 3213 3214 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu) 3215 { 3216 return (!lapic_in_kernel(vcpu) || 3217 kvm_apic_accept_pic_intr(vcpu)); 3218 } 3219 3220 /* 3221 * if userspace requested an interrupt window, check that the 3222 * interrupt window is open. 3223 * 3224 * No need to exit to userspace if we already have an interrupt queued. 3225 */ 3226 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu) 3227 { 3228 return kvm_arch_interrupt_allowed(vcpu) && 3229 !kvm_cpu_has_interrupt(vcpu) && 3230 !kvm_event_needs_reinjection(vcpu) && 3231 kvm_cpu_accept_dm_intr(vcpu); 3232 } 3233 3234 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, 3235 struct kvm_interrupt *irq) 3236 { 3237 if (irq->irq >= KVM_NR_INTERRUPTS) 3238 return -EINVAL; 3239 3240 if (!irqchip_in_kernel(vcpu->kvm)) { 3241 kvm_queue_interrupt(vcpu, irq->irq, false); 3242 kvm_make_request(KVM_REQ_EVENT, vcpu); 3243 return 0; 3244 } 3245 3246 /* 3247 * With in-kernel LAPIC, we only use this to inject EXTINT, so 3248 * fail for in-kernel 8259. 3249 */ 3250 if (pic_in_kernel(vcpu->kvm)) 3251 return -ENXIO; 3252 3253 if (vcpu->arch.pending_external_vector != -1) 3254 return -EEXIST; 3255 3256 vcpu->arch.pending_external_vector = irq->irq; 3257 kvm_make_request(KVM_REQ_EVENT, vcpu); 3258 return 0; 3259 } 3260 3261 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) 3262 { 3263 kvm_inject_nmi(vcpu); 3264 3265 return 0; 3266 } 3267 3268 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu) 3269 { 3270 kvm_make_request(KVM_REQ_SMI, vcpu); 3271 3272 return 0; 3273 } 3274 3275 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, 3276 struct kvm_tpr_access_ctl *tac) 3277 { 3278 if (tac->flags) 3279 return -EINVAL; 3280 vcpu->arch.tpr_access_reporting = !!tac->enabled; 3281 return 0; 3282 } 3283 3284 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, 3285 u64 mcg_cap) 3286 { 3287 int r; 3288 unsigned bank_num = mcg_cap & 0xff, bank; 3289 3290 r = -EINVAL; 3291 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) 3292 goto out; 3293 if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000)) 3294 goto out; 3295 r = 0; 3296 vcpu->arch.mcg_cap = mcg_cap; 3297 /* Init IA32_MCG_CTL to all 1s */ 3298 if (mcg_cap & MCG_CTL_P) 3299 vcpu->arch.mcg_ctl = ~(u64)0; 3300 /* Init IA32_MCi_CTL to all 1s */ 3301 for (bank = 0; bank < bank_num; bank++) 3302 vcpu->arch.mce_banks[bank*4] = ~(u64)0; 3303 3304 if (kvm_x86_ops->setup_mce) 3305 kvm_x86_ops->setup_mce(vcpu); 3306 out: 3307 return r; 3308 } 3309 3310 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, 3311 struct kvm_x86_mce *mce) 3312 { 3313 u64 mcg_cap = vcpu->arch.mcg_cap; 3314 unsigned bank_num = mcg_cap & 0xff; 3315 u64 *banks = vcpu->arch.mce_banks; 3316 3317 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) 3318 return -EINVAL; 3319 /* 3320 * if IA32_MCG_CTL is not all 1s, the uncorrected error 3321 * reporting is disabled 3322 */ 3323 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && 3324 vcpu->arch.mcg_ctl != ~(u64)0) 3325 return 0; 3326 banks += 4 * mce->bank; 3327 /* 3328 * if IA32_MCi_CTL is not all 1s, the uncorrected error 3329 * reporting is disabled for the bank 3330 */ 3331 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) 3332 return 0; 3333 if (mce->status & MCI_STATUS_UC) { 3334 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || 3335 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { 3336 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 3337 return 0; 3338 } 3339 if (banks[1] & MCI_STATUS_VAL) 3340 mce->status |= MCI_STATUS_OVER; 3341 banks[2] = mce->addr; 3342 banks[3] = mce->misc; 3343 vcpu->arch.mcg_status = mce->mcg_status; 3344 banks[1] = mce->status; 3345 kvm_queue_exception(vcpu, MC_VECTOR); 3346 } else if (!(banks[1] & MCI_STATUS_VAL) 3347 || !(banks[1] & MCI_STATUS_UC)) { 3348 if (banks[1] & MCI_STATUS_VAL) 3349 mce->status |= MCI_STATUS_OVER; 3350 banks[2] = mce->addr; 3351 banks[3] = mce->misc; 3352 banks[1] = mce->status; 3353 } else 3354 banks[1] |= MCI_STATUS_OVER; 3355 return 0; 3356 } 3357 3358 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, 3359 struct kvm_vcpu_events *events) 3360 { 3361 process_nmi(vcpu); 3362 /* 3363 * FIXME: pass injected and pending separately. This is only 3364 * needed for nested virtualization, whose state cannot be 3365 * migrated yet. For now we can combine them. 3366 */ 3367 events->exception.injected = 3368 (vcpu->arch.exception.pending || 3369 vcpu->arch.exception.injected) && 3370 !kvm_exception_is_soft(vcpu->arch.exception.nr); 3371 events->exception.nr = vcpu->arch.exception.nr; 3372 events->exception.has_error_code = vcpu->arch.exception.has_error_code; 3373 events->exception.pad = 0; 3374 events->exception.error_code = vcpu->arch.exception.error_code; 3375 3376 events->interrupt.injected = 3377 vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft; 3378 events->interrupt.nr = vcpu->arch.interrupt.nr; 3379 events->interrupt.soft = 0; 3380 events->interrupt.shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 3381 3382 events->nmi.injected = vcpu->arch.nmi_injected; 3383 events->nmi.pending = vcpu->arch.nmi_pending != 0; 3384 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); 3385 events->nmi.pad = 0; 3386 3387 events->sipi_vector = 0; /* never valid when reporting to user space */ 3388 3389 events->smi.smm = is_smm(vcpu); 3390 events->smi.pending = vcpu->arch.smi_pending; 3391 events->smi.smm_inside_nmi = 3392 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK); 3393 events->smi.latched_init = kvm_lapic_latched_init(vcpu); 3394 3395 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING 3396 | KVM_VCPUEVENT_VALID_SHADOW 3397 | KVM_VCPUEVENT_VALID_SMM); 3398 memset(&events->reserved, 0, sizeof(events->reserved)); 3399 } 3400 3401 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags); 3402 3403 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, 3404 struct kvm_vcpu_events *events) 3405 { 3406 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING 3407 | KVM_VCPUEVENT_VALID_SIPI_VECTOR 3408 | KVM_VCPUEVENT_VALID_SHADOW 3409 | KVM_VCPUEVENT_VALID_SMM)) 3410 return -EINVAL; 3411 3412 if (events->exception.injected && 3413 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR || 3414 is_guest_mode(vcpu))) 3415 return -EINVAL; 3416 3417 /* INITs are latched while in SMM */ 3418 if (events->flags & KVM_VCPUEVENT_VALID_SMM && 3419 (events->smi.smm || events->smi.pending) && 3420 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) 3421 return -EINVAL; 3422 3423 process_nmi(vcpu); 3424 vcpu->arch.exception.injected = false; 3425 vcpu->arch.exception.pending = events->exception.injected; 3426 vcpu->arch.exception.nr = events->exception.nr; 3427 vcpu->arch.exception.has_error_code = events->exception.has_error_code; 3428 vcpu->arch.exception.error_code = events->exception.error_code; 3429 3430 vcpu->arch.interrupt.injected = events->interrupt.injected; 3431 vcpu->arch.interrupt.nr = events->interrupt.nr; 3432 vcpu->arch.interrupt.soft = events->interrupt.soft; 3433 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) 3434 kvm_x86_ops->set_interrupt_shadow(vcpu, 3435 events->interrupt.shadow); 3436 3437 vcpu->arch.nmi_injected = events->nmi.injected; 3438 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) 3439 vcpu->arch.nmi_pending = events->nmi.pending; 3440 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); 3441 3442 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR && 3443 lapic_in_kernel(vcpu)) 3444 vcpu->arch.apic->sipi_vector = events->sipi_vector; 3445 3446 if (events->flags & KVM_VCPUEVENT_VALID_SMM) { 3447 u32 hflags = vcpu->arch.hflags; 3448 if (events->smi.smm) 3449 hflags |= HF_SMM_MASK; 3450 else 3451 hflags &= ~HF_SMM_MASK; 3452 kvm_set_hflags(vcpu, hflags); 3453 3454 vcpu->arch.smi_pending = events->smi.pending; 3455 3456 if (events->smi.smm) { 3457 if (events->smi.smm_inside_nmi) 3458 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 3459 else 3460 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; 3461 if (lapic_in_kernel(vcpu)) { 3462 if (events->smi.latched_init) 3463 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3464 else 3465 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3466 } 3467 } 3468 } 3469 3470 kvm_make_request(KVM_REQ_EVENT, vcpu); 3471 3472 return 0; 3473 } 3474 3475 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, 3476 struct kvm_debugregs *dbgregs) 3477 { 3478 unsigned long val; 3479 3480 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); 3481 kvm_get_dr(vcpu, 6, &val); 3482 dbgregs->dr6 = val; 3483 dbgregs->dr7 = vcpu->arch.dr7; 3484 dbgregs->flags = 0; 3485 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); 3486 } 3487 3488 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, 3489 struct kvm_debugregs *dbgregs) 3490 { 3491 if (dbgregs->flags) 3492 return -EINVAL; 3493 3494 if (dbgregs->dr6 & ~0xffffffffull) 3495 return -EINVAL; 3496 if (dbgregs->dr7 & ~0xffffffffull) 3497 return -EINVAL; 3498 3499 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); 3500 kvm_update_dr0123(vcpu); 3501 vcpu->arch.dr6 = dbgregs->dr6; 3502 kvm_update_dr6(vcpu); 3503 vcpu->arch.dr7 = dbgregs->dr7; 3504 kvm_update_dr7(vcpu); 3505 3506 return 0; 3507 } 3508 3509 #define XSTATE_COMPACTION_ENABLED (1ULL << 63) 3510 3511 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) 3512 { 3513 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; 3514 u64 xstate_bv = xsave->header.xfeatures; 3515 u64 valid; 3516 3517 /* 3518 * Copy legacy XSAVE area, to avoid complications with CPUID 3519 * leaves 0 and 1 in the loop below. 3520 */ 3521 memcpy(dest, xsave, XSAVE_HDR_OFFSET); 3522 3523 /* Set XSTATE_BV */ 3524 xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE; 3525 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv; 3526 3527 /* 3528 * Copy each region from the possibly compacted offset to the 3529 * non-compacted offset. 3530 */ 3531 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3532 while (valid) { 3533 u64 feature = valid & -valid; 3534 int index = fls64(feature) - 1; 3535 void *src = get_xsave_addr(xsave, feature); 3536 3537 if (src) { 3538 u32 size, offset, ecx, edx; 3539 cpuid_count(XSTATE_CPUID, index, 3540 &size, &offset, &ecx, &edx); 3541 if (feature == XFEATURE_MASK_PKRU) 3542 memcpy(dest + offset, &vcpu->arch.pkru, 3543 sizeof(vcpu->arch.pkru)); 3544 else 3545 memcpy(dest + offset, src, size); 3546 3547 } 3548 3549 valid -= feature; 3550 } 3551 } 3552 3553 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src) 3554 { 3555 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; 3556 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET); 3557 u64 valid; 3558 3559 /* 3560 * Copy legacy XSAVE area, to avoid complications with CPUID 3561 * leaves 0 and 1 in the loop below. 3562 */ 3563 memcpy(xsave, src, XSAVE_HDR_OFFSET); 3564 3565 /* Set XSTATE_BV and possibly XCOMP_BV. */ 3566 xsave->header.xfeatures = xstate_bv; 3567 if (boot_cpu_has(X86_FEATURE_XSAVES)) 3568 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED; 3569 3570 /* 3571 * Copy each region from the non-compacted offset to the 3572 * possibly compacted offset. 3573 */ 3574 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3575 while (valid) { 3576 u64 feature = valid & -valid; 3577 int index = fls64(feature) - 1; 3578 void *dest = get_xsave_addr(xsave, feature); 3579 3580 if (dest) { 3581 u32 size, offset, ecx, edx; 3582 cpuid_count(XSTATE_CPUID, index, 3583 &size, &offset, &ecx, &edx); 3584 if (feature == XFEATURE_MASK_PKRU) 3585 memcpy(&vcpu->arch.pkru, src + offset, 3586 sizeof(vcpu->arch.pkru)); 3587 else 3588 memcpy(dest, src + offset, size); 3589 } 3590 3591 valid -= feature; 3592 } 3593 } 3594 3595 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, 3596 struct kvm_xsave *guest_xsave) 3597 { 3598 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3599 memset(guest_xsave, 0, sizeof(struct kvm_xsave)); 3600 fill_xsave((u8 *) guest_xsave->region, vcpu); 3601 } else { 3602 memcpy(guest_xsave->region, 3603 &vcpu->arch.guest_fpu.state.fxsave, 3604 sizeof(struct fxregs_state)); 3605 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = 3606 XFEATURE_MASK_FPSSE; 3607 } 3608 } 3609 3610 #define XSAVE_MXCSR_OFFSET 24 3611 3612 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, 3613 struct kvm_xsave *guest_xsave) 3614 { 3615 u64 xstate_bv = 3616 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; 3617 u32 mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)]; 3618 3619 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3620 /* 3621 * Here we allow setting states that are not present in 3622 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility 3623 * with old userspace. 3624 */ 3625 if (xstate_bv & ~kvm_supported_xcr0() || 3626 mxcsr & ~mxcsr_feature_mask) 3627 return -EINVAL; 3628 load_xsave(vcpu, (u8 *)guest_xsave->region); 3629 } else { 3630 if (xstate_bv & ~XFEATURE_MASK_FPSSE || 3631 mxcsr & ~mxcsr_feature_mask) 3632 return -EINVAL; 3633 memcpy(&vcpu->arch.guest_fpu.state.fxsave, 3634 guest_xsave->region, sizeof(struct fxregs_state)); 3635 } 3636 return 0; 3637 } 3638 3639 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, 3640 struct kvm_xcrs *guest_xcrs) 3641 { 3642 if (!boot_cpu_has(X86_FEATURE_XSAVE)) { 3643 guest_xcrs->nr_xcrs = 0; 3644 return; 3645 } 3646 3647 guest_xcrs->nr_xcrs = 1; 3648 guest_xcrs->flags = 0; 3649 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK; 3650 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0; 3651 } 3652 3653 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, 3654 struct kvm_xcrs *guest_xcrs) 3655 { 3656 int i, r = 0; 3657 3658 if (!boot_cpu_has(X86_FEATURE_XSAVE)) 3659 return -EINVAL; 3660 3661 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags) 3662 return -EINVAL; 3663 3664 for (i = 0; i < guest_xcrs->nr_xcrs; i++) 3665 /* Only support XCR0 currently */ 3666 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) { 3667 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK, 3668 guest_xcrs->xcrs[i].value); 3669 break; 3670 } 3671 if (r) 3672 r = -EINVAL; 3673 return r; 3674 } 3675 3676 /* 3677 * kvm_set_guest_paused() indicates to the guest kernel that it has been 3678 * stopped by the hypervisor. This function will be called from the host only. 3679 * EINVAL is returned when the host attempts to set the flag for a guest that 3680 * does not support pv clocks. 3681 */ 3682 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) 3683 { 3684 if (!vcpu->arch.pv_time_enabled) 3685 return -EINVAL; 3686 vcpu->arch.pvclock_set_guest_stopped_request = true; 3687 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 3688 return 0; 3689 } 3690 3691 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 3692 struct kvm_enable_cap *cap) 3693 { 3694 if (cap->flags) 3695 return -EINVAL; 3696 3697 switch (cap->cap) { 3698 case KVM_CAP_HYPERV_SYNIC2: 3699 if (cap->args[0]) 3700 return -EINVAL; 3701 case KVM_CAP_HYPERV_SYNIC: 3702 if (!irqchip_in_kernel(vcpu->kvm)) 3703 return -EINVAL; 3704 return kvm_hv_activate_synic(vcpu, cap->cap == 3705 KVM_CAP_HYPERV_SYNIC2); 3706 default: 3707 return -EINVAL; 3708 } 3709 } 3710 3711 long kvm_arch_vcpu_ioctl(struct file *filp, 3712 unsigned int ioctl, unsigned long arg) 3713 { 3714 struct kvm_vcpu *vcpu = filp->private_data; 3715 void __user *argp = (void __user *)arg; 3716 int r; 3717 union { 3718 struct kvm_lapic_state *lapic; 3719 struct kvm_xsave *xsave; 3720 struct kvm_xcrs *xcrs; 3721 void *buffer; 3722 } u; 3723 3724 vcpu_load(vcpu); 3725 3726 u.buffer = NULL; 3727 switch (ioctl) { 3728 case KVM_GET_LAPIC: { 3729 r = -EINVAL; 3730 if (!lapic_in_kernel(vcpu)) 3731 goto out; 3732 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); 3733 3734 r = -ENOMEM; 3735 if (!u.lapic) 3736 goto out; 3737 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic); 3738 if (r) 3739 goto out; 3740 r = -EFAULT; 3741 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state))) 3742 goto out; 3743 r = 0; 3744 break; 3745 } 3746 case KVM_SET_LAPIC: { 3747 r = -EINVAL; 3748 if (!lapic_in_kernel(vcpu)) 3749 goto out; 3750 u.lapic = memdup_user(argp, sizeof(*u.lapic)); 3751 if (IS_ERR(u.lapic)) { 3752 r = PTR_ERR(u.lapic); 3753 goto out_nofree; 3754 } 3755 3756 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic); 3757 break; 3758 } 3759 case KVM_INTERRUPT: { 3760 struct kvm_interrupt irq; 3761 3762 r = -EFAULT; 3763 if (copy_from_user(&irq, argp, sizeof irq)) 3764 goto out; 3765 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 3766 break; 3767 } 3768 case KVM_NMI: { 3769 r = kvm_vcpu_ioctl_nmi(vcpu); 3770 break; 3771 } 3772 case KVM_SMI: { 3773 r = kvm_vcpu_ioctl_smi(vcpu); 3774 break; 3775 } 3776 case KVM_SET_CPUID: { 3777 struct kvm_cpuid __user *cpuid_arg = argp; 3778 struct kvm_cpuid cpuid; 3779 3780 r = -EFAULT; 3781 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3782 goto out; 3783 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); 3784 break; 3785 } 3786 case KVM_SET_CPUID2: { 3787 struct kvm_cpuid2 __user *cpuid_arg = argp; 3788 struct kvm_cpuid2 cpuid; 3789 3790 r = -EFAULT; 3791 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3792 goto out; 3793 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, 3794 cpuid_arg->entries); 3795 break; 3796 } 3797 case KVM_GET_CPUID2: { 3798 struct kvm_cpuid2 __user *cpuid_arg = argp; 3799 struct kvm_cpuid2 cpuid; 3800 3801 r = -EFAULT; 3802 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3803 goto out; 3804 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, 3805 cpuid_arg->entries); 3806 if (r) 3807 goto out; 3808 r = -EFAULT; 3809 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) 3810 goto out; 3811 r = 0; 3812 break; 3813 } 3814 case KVM_GET_MSRS: { 3815 int idx = srcu_read_lock(&vcpu->kvm->srcu); 3816 r = msr_io(vcpu, argp, do_get_msr, 1); 3817 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3818 break; 3819 } 3820 case KVM_SET_MSRS: { 3821 int idx = srcu_read_lock(&vcpu->kvm->srcu); 3822 r = msr_io(vcpu, argp, do_set_msr, 0); 3823 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3824 break; 3825 } 3826 case KVM_TPR_ACCESS_REPORTING: { 3827 struct kvm_tpr_access_ctl tac; 3828 3829 r = -EFAULT; 3830 if (copy_from_user(&tac, argp, sizeof tac)) 3831 goto out; 3832 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); 3833 if (r) 3834 goto out; 3835 r = -EFAULT; 3836 if (copy_to_user(argp, &tac, sizeof tac)) 3837 goto out; 3838 r = 0; 3839 break; 3840 }; 3841 case KVM_SET_VAPIC_ADDR: { 3842 struct kvm_vapic_addr va; 3843 int idx; 3844 3845 r = -EINVAL; 3846 if (!lapic_in_kernel(vcpu)) 3847 goto out; 3848 r = -EFAULT; 3849 if (copy_from_user(&va, argp, sizeof va)) 3850 goto out; 3851 idx = srcu_read_lock(&vcpu->kvm->srcu); 3852 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); 3853 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3854 break; 3855 } 3856 case KVM_X86_SETUP_MCE: { 3857 u64 mcg_cap; 3858 3859 r = -EFAULT; 3860 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap)) 3861 goto out; 3862 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); 3863 break; 3864 } 3865 case KVM_X86_SET_MCE: { 3866 struct kvm_x86_mce mce; 3867 3868 r = -EFAULT; 3869 if (copy_from_user(&mce, argp, sizeof mce)) 3870 goto out; 3871 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); 3872 break; 3873 } 3874 case KVM_GET_VCPU_EVENTS: { 3875 struct kvm_vcpu_events events; 3876 3877 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); 3878 3879 r = -EFAULT; 3880 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) 3881 break; 3882 r = 0; 3883 break; 3884 } 3885 case KVM_SET_VCPU_EVENTS: { 3886 struct kvm_vcpu_events events; 3887 3888 r = -EFAULT; 3889 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) 3890 break; 3891 3892 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); 3893 break; 3894 } 3895 case KVM_GET_DEBUGREGS: { 3896 struct kvm_debugregs dbgregs; 3897 3898 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs); 3899 3900 r = -EFAULT; 3901 if (copy_to_user(argp, &dbgregs, 3902 sizeof(struct kvm_debugregs))) 3903 break; 3904 r = 0; 3905 break; 3906 } 3907 case KVM_SET_DEBUGREGS: { 3908 struct kvm_debugregs dbgregs; 3909 3910 r = -EFAULT; 3911 if (copy_from_user(&dbgregs, argp, 3912 sizeof(struct kvm_debugregs))) 3913 break; 3914 3915 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs); 3916 break; 3917 } 3918 case KVM_GET_XSAVE: { 3919 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL); 3920 r = -ENOMEM; 3921 if (!u.xsave) 3922 break; 3923 3924 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave); 3925 3926 r = -EFAULT; 3927 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave))) 3928 break; 3929 r = 0; 3930 break; 3931 } 3932 case KVM_SET_XSAVE: { 3933 u.xsave = memdup_user(argp, sizeof(*u.xsave)); 3934 if (IS_ERR(u.xsave)) { 3935 r = PTR_ERR(u.xsave); 3936 goto out_nofree; 3937 } 3938 3939 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave); 3940 break; 3941 } 3942 case KVM_GET_XCRS: { 3943 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL); 3944 r = -ENOMEM; 3945 if (!u.xcrs) 3946 break; 3947 3948 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs); 3949 3950 r = -EFAULT; 3951 if (copy_to_user(argp, u.xcrs, 3952 sizeof(struct kvm_xcrs))) 3953 break; 3954 r = 0; 3955 break; 3956 } 3957 case KVM_SET_XCRS: { 3958 u.xcrs = memdup_user(argp, sizeof(*u.xcrs)); 3959 if (IS_ERR(u.xcrs)) { 3960 r = PTR_ERR(u.xcrs); 3961 goto out_nofree; 3962 } 3963 3964 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs); 3965 break; 3966 } 3967 case KVM_SET_TSC_KHZ: { 3968 u32 user_tsc_khz; 3969 3970 r = -EINVAL; 3971 user_tsc_khz = (u32)arg; 3972 3973 if (user_tsc_khz >= kvm_max_guest_tsc_khz) 3974 goto out; 3975 3976 if (user_tsc_khz == 0) 3977 user_tsc_khz = tsc_khz; 3978 3979 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz)) 3980 r = 0; 3981 3982 goto out; 3983 } 3984 case KVM_GET_TSC_KHZ: { 3985 r = vcpu->arch.virtual_tsc_khz; 3986 goto out; 3987 } 3988 case KVM_KVMCLOCK_CTRL: { 3989 r = kvm_set_guest_paused(vcpu); 3990 goto out; 3991 } 3992 case KVM_ENABLE_CAP: { 3993 struct kvm_enable_cap cap; 3994 3995 r = -EFAULT; 3996 if (copy_from_user(&cap, argp, sizeof(cap))) 3997 goto out; 3998 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 3999 break; 4000 } 4001 case KVM_GET_NESTED_STATE: { 4002 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4003 u32 user_data_size; 4004 4005 r = -EINVAL; 4006 if (!kvm_x86_ops->get_nested_state) 4007 break; 4008 4009 BUILD_BUG_ON(sizeof(user_data_size) != sizeof(user_kvm_nested_state->size)); 4010 if (get_user(user_data_size, &user_kvm_nested_state->size)) 4011 return -EFAULT; 4012 4013 r = kvm_x86_ops->get_nested_state(vcpu, user_kvm_nested_state, 4014 user_data_size); 4015 if (r < 0) 4016 return r; 4017 4018 if (r > user_data_size) { 4019 if (put_user(r, &user_kvm_nested_state->size)) 4020 return -EFAULT; 4021 return -E2BIG; 4022 } 4023 r = 0; 4024 break; 4025 } 4026 case KVM_SET_NESTED_STATE: { 4027 struct kvm_nested_state __user *user_kvm_nested_state = argp; 4028 struct kvm_nested_state kvm_state; 4029 4030 r = -EINVAL; 4031 if (!kvm_x86_ops->set_nested_state) 4032 break; 4033 4034 if (copy_from_user(&kvm_state, user_kvm_nested_state, sizeof(kvm_state))) 4035 return -EFAULT; 4036 4037 if (kvm_state.size < sizeof(kvm_state)) 4038 return -EINVAL; 4039 4040 if (kvm_state.flags & 4041 ~(KVM_STATE_NESTED_RUN_PENDING | KVM_STATE_NESTED_GUEST_MODE)) 4042 return -EINVAL; 4043 4044 /* nested_run_pending implies guest_mode. */ 4045 if (kvm_state.flags == KVM_STATE_NESTED_RUN_PENDING) 4046 return -EINVAL; 4047 4048 r = kvm_x86_ops->set_nested_state(vcpu, user_kvm_nested_state, &kvm_state); 4049 break; 4050 } 4051 default: 4052 r = -EINVAL; 4053 } 4054 out: 4055 kfree(u.buffer); 4056 out_nofree: 4057 vcpu_put(vcpu); 4058 return r; 4059 } 4060 4061 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 4062 { 4063 return VM_FAULT_SIGBUS; 4064 } 4065 4066 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) 4067 { 4068 int ret; 4069 4070 if (addr > (unsigned int)(-3 * PAGE_SIZE)) 4071 return -EINVAL; 4072 ret = kvm_x86_ops->set_tss_addr(kvm, addr); 4073 return ret; 4074 } 4075 4076 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, 4077 u64 ident_addr) 4078 { 4079 return kvm_x86_ops->set_identity_map_addr(kvm, ident_addr); 4080 } 4081 4082 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, 4083 u32 kvm_nr_mmu_pages) 4084 { 4085 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) 4086 return -EINVAL; 4087 4088 mutex_lock(&kvm->slots_lock); 4089 4090 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); 4091 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; 4092 4093 mutex_unlock(&kvm->slots_lock); 4094 return 0; 4095 } 4096 4097 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) 4098 { 4099 return kvm->arch.n_max_mmu_pages; 4100 } 4101 4102 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 4103 { 4104 struct kvm_pic *pic = kvm->arch.vpic; 4105 int r; 4106 4107 r = 0; 4108 switch (chip->chip_id) { 4109 case KVM_IRQCHIP_PIC_MASTER: 4110 memcpy(&chip->chip.pic, &pic->pics[0], 4111 sizeof(struct kvm_pic_state)); 4112 break; 4113 case KVM_IRQCHIP_PIC_SLAVE: 4114 memcpy(&chip->chip.pic, &pic->pics[1], 4115 sizeof(struct kvm_pic_state)); 4116 break; 4117 case KVM_IRQCHIP_IOAPIC: 4118 kvm_get_ioapic(kvm, &chip->chip.ioapic); 4119 break; 4120 default: 4121 r = -EINVAL; 4122 break; 4123 } 4124 return r; 4125 } 4126 4127 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 4128 { 4129 struct kvm_pic *pic = kvm->arch.vpic; 4130 int r; 4131 4132 r = 0; 4133 switch (chip->chip_id) { 4134 case KVM_IRQCHIP_PIC_MASTER: 4135 spin_lock(&pic->lock); 4136 memcpy(&pic->pics[0], &chip->chip.pic, 4137 sizeof(struct kvm_pic_state)); 4138 spin_unlock(&pic->lock); 4139 break; 4140 case KVM_IRQCHIP_PIC_SLAVE: 4141 spin_lock(&pic->lock); 4142 memcpy(&pic->pics[1], &chip->chip.pic, 4143 sizeof(struct kvm_pic_state)); 4144 spin_unlock(&pic->lock); 4145 break; 4146 case KVM_IRQCHIP_IOAPIC: 4147 kvm_set_ioapic(kvm, &chip->chip.ioapic); 4148 break; 4149 default: 4150 r = -EINVAL; 4151 break; 4152 } 4153 kvm_pic_update_irq(pic); 4154 return r; 4155 } 4156 4157 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) 4158 { 4159 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state; 4160 4161 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels)); 4162 4163 mutex_lock(&kps->lock); 4164 memcpy(ps, &kps->channels, sizeof(*ps)); 4165 mutex_unlock(&kps->lock); 4166 return 0; 4167 } 4168 4169 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) 4170 { 4171 int i; 4172 struct kvm_pit *pit = kvm->arch.vpit; 4173 4174 mutex_lock(&pit->pit_state.lock); 4175 memcpy(&pit->pit_state.channels, ps, sizeof(*ps)); 4176 for (i = 0; i < 3; i++) 4177 kvm_pit_load_count(pit, i, ps->channels[i].count, 0); 4178 mutex_unlock(&pit->pit_state.lock); 4179 return 0; 4180 } 4181 4182 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 4183 { 4184 mutex_lock(&kvm->arch.vpit->pit_state.lock); 4185 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, 4186 sizeof(ps->channels)); 4187 ps->flags = kvm->arch.vpit->pit_state.flags; 4188 mutex_unlock(&kvm->arch.vpit->pit_state.lock); 4189 memset(&ps->reserved, 0, sizeof(ps->reserved)); 4190 return 0; 4191 } 4192 4193 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 4194 { 4195 int start = 0; 4196 int i; 4197 u32 prev_legacy, cur_legacy; 4198 struct kvm_pit *pit = kvm->arch.vpit; 4199 4200 mutex_lock(&pit->pit_state.lock); 4201 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; 4202 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; 4203 if (!prev_legacy && cur_legacy) 4204 start = 1; 4205 memcpy(&pit->pit_state.channels, &ps->channels, 4206 sizeof(pit->pit_state.channels)); 4207 pit->pit_state.flags = ps->flags; 4208 for (i = 0; i < 3; i++) 4209 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, 4210 start && i == 0); 4211 mutex_unlock(&pit->pit_state.lock); 4212 return 0; 4213 } 4214 4215 static int kvm_vm_ioctl_reinject(struct kvm *kvm, 4216 struct kvm_reinject_control *control) 4217 { 4218 struct kvm_pit *pit = kvm->arch.vpit; 4219 4220 if (!pit) 4221 return -ENXIO; 4222 4223 /* pit->pit_state.lock was overloaded to prevent userspace from getting 4224 * an inconsistent state after running multiple KVM_REINJECT_CONTROL 4225 * ioctls in parallel. Use a separate lock if that ioctl isn't rare. 4226 */ 4227 mutex_lock(&pit->pit_state.lock); 4228 kvm_pit_set_reinject(pit, control->pit_reinject); 4229 mutex_unlock(&pit->pit_state.lock); 4230 4231 return 0; 4232 } 4233 4234 /** 4235 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot 4236 * @kvm: kvm instance 4237 * @log: slot id and address to which we copy the log 4238 * 4239 * Steps 1-4 below provide general overview of dirty page logging. See 4240 * kvm_get_dirty_log_protect() function description for additional details. 4241 * 4242 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we 4243 * always flush the TLB (step 4) even if previous step failed and the dirty 4244 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API 4245 * does not preclude user space subsequent dirty log read. Flushing TLB ensures 4246 * writes will be marked dirty for next log read. 4247 * 4248 * 1. Take a snapshot of the bit and clear it if needed. 4249 * 2. Write protect the corresponding page. 4250 * 3. Copy the snapshot to the userspace. 4251 * 4. Flush TLB's if needed. 4252 */ 4253 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 4254 { 4255 bool is_dirty = false; 4256 int r; 4257 4258 mutex_lock(&kvm->slots_lock); 4259 4260 /* 4261 * Flush potentially hardware-cached dirty pages to dirty_bitmap. 4262 */ 4263 if (kvm_x86_ops->flush_log_dirty) 4264 kvm_x86_ops->flush_log_dirty(kvm); 4265 4266 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); 4267 4268 /* 4269 * All the TLBs can be flushed out of mmu lock, see the comments in 4270 * kvm_mmu_slot_remove_write_access(). 4271 */ 4272 lockdep_assert_held(&kvm->slots_lock); 4273 if (is_dirty) 4274 kvm_flush_remote_tlbs(kvm); 4275 4276 mutex_unlock(&kvm->slots_lock); 4277 return r; 4278 } 4279 4280 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, 4281 bool line_status) 4282 { 4283 if (!irqchip_in_kernel(kvm)) 4284 return -ENXIO; 4285 4286 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 4287 irq_event->irq, irq_event->level, 4288 line_status); 4289 return 0; 4290 } 4291 4292 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 4293 struct kvm_enable_cap *cap) 4294 { 4295 int r; 4296 4297 if (cap->flags) 4298 return -EINVAL; 4299 4300 switch (cap->cap) { 4301 case KVM_CAP_DISABLE_QUIRKS: 4302 kvm->arch.disabled_quirks = cap->args[0]; 4303 r = 0; 4304 break; 4305 case KVM_CAP_SPLIT_IRQCHIP: { 4306 mutex_lock(&kvm->lock); 4307 r = -EINVAL; 4308 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS) 4309 goto split_irqchip_unlock; 4310 r = -EEXIST; 4311 if (irqchip_in_kernel(kvm)) 4312 goto split_irqchip_unlock; 4313 if (kvm->created_vcpus) 4314 goto split_irqchip_unlock; 4315 r = kvm_setup_empty_irq_routing(kvm); 4316 if (r) 4317 goto split_irqchip_unlock; 4318 /* Pairs with irqchip_in_kernel. */ 4319 smp_wmb(); 4320 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT; 4321 kvm->arch.nr_reserved_ioapic_pins = cap->args[0]; 4322 r = 0; 4323 split_irqchip_unlock: 4324 mutex_unlock(&kvm->lock); 4325 break; 4326 } 4327 case KVM_CAP_X2APIC_API: 4328 r = -EINVAL; 4329 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS) 4330 break; 4331 4332 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS) 4333 kvm->arch.x2apic_format = true; 4334 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 4335 kvm->arch.x2apic_broadcast_quirk_disabled = true; 4336 4337 r = 0; 4338 break; 4339 case KVM_CAP_X86_DISABLE_EXITS: 4340 r = -EINVAL; 4341 if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS) 4342 break; 4343 4344 if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) && 4345 kvm_can_mwait_in_guest()) 4346 kvm->arch.mwait_in_guest = true; 4347 if (cap->args[0] & KVM_X86_DISABLE_EXITS_HLT) 4348 kvm->arch.hlt_in_guest = true; 4349 if (cap->args[0] & KVM_X86_DISABLE_EXITS_PAUSE) 4350 kvm->arch.pause_in_guest = true; 4351 r = 0; 4352 break; 4353 default: 4354 r = -EINVAL; 4355 break; 4356 } 4357 return r; 4358 } 4359 4360 long kvm_arch_vm_ioctl(struct file *filp, 4361 unsigned int ioctl, unsigned long arg) 4362 { 4363 struct kvm *kvm = filp->private_data; 4364 void __user *argp = (void __user *)arg; 4365 int r = -ENOTTY; 4366 /* 4367 * This union makes it completely explicit to gcc-3.x 4368 * that these two variables' stack usage should be 4369 * combined, not added together. 4370 */ 4371 union { 4372 struct kvm_pit_state ps; 4373 struct kvm_pit_state2 ps2; 4374 struct kvm_pit_config pit_config; 4375 } u; 4376 4377 switch (ioctl) { 4378 case KVM_SET_TSS_ADDR: 4379 r = kvm_vm_ioctl_set_tss_addr(kvm, arg); 4380 break; 4381 case KVM_SET_IDENTITY_MAP_ADDR: { 4382 u64 ident_addr; 4383 4384 mutex_lock(&kvm->lock); 4385 r = -EINVAL; 4386 if (kvm->created_vcpus) 4387 goto set_identity_unlock; 4388 r = -EFAULT; 4389 if (copy_from_user(&ident_addr, argp, sizeof ident_addr)) 4390 goto set_identity_unlock; 4391 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); 4392 set_identity_unlock: 4393 mutex_unlock(&kvm->lock); 4394 break; 4395 } 4396 case KVM_SET_NR_MMU_PAGES: 4397 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); 4398 break; 4399 case KVM_GET_NR_MMU_PAGES: 4400 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); 4401 break; 4402 case KVM_CREATE_IRQCHIP: { 4403 mutex_lock(&kvm->lock); 4404 4405 r = -EEXIST; 4406 if (irqchip_in_kernel(kvm)) 4407 goto create_irqchip_unlock; 4408 4409 r = -EINVAL; 4410 if (kvm->created_vcpus) 4411 goto create_irqchip_unlock; 4412 4413 r = kvm_pic_init(kvm); 4414 if (r) 4415 goto create_irqchip_unlock; 4416 4417 r = kvm_ioapic_init(kvm); 4418 if (r) { 4419 kvm_pic_destroy(kvm); 4420 goto create_irqchip_unlock; 4421 } 4422 4423 r = kvm_setup_default_irq_routing(kvm); 4424 if (r) { 4425 kvm_ioapic_destroy(kvm); 4426 kvm_pic_destroy(kvm); 4427 goto create_irqchip_unlock; 4428 } 4429 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */ 4430 smp_wmb(); 4431 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL; 4432 create_irqchip_unlock: 4433 mutex_unlock(&kvm->lock); 4434 break; 4435 } 4436 case KVM_CREATE_PIT: 4437 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; 4438 goto create_pit; 4439 case KVM_CREATE_PIT2: 4440 r = -EFAULT; 4441 if (copy_from_user(&u.pit_config, argp, 4442 sizeof(struct kvm_pit_config))) 4443 goto out; 4444 create_pit: 4445 mutex_lock(&kvm->lock); 4446 r = -EEXIST; 4447 if (kvm->arch.vpit) 4448 goto create_pit_unlock; 4449 r = -ENOMEM; 4450 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); 4451 if (kvm->arch.vpit) 4452 r = 0; 4453 create_pit_unlock: 4454 mutex_unlock(&kvm->lock); 4455 break; 4456 case KVM_GET_IRQCHIP: { 4457 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4458 struct kvm_irqchip *chip; 4459 4460 chip = memdup_user(argp, sizeof(*chip)); 4461 if (IS_ERR(chip)) { 4462 r = PTR_ERR(chip); 4463 goto out; 4464 } 4465 4466 r = -ENXIO; 4467 if (!irqchip_kernel(kvm)) 4468 goto get_irqchip_out; 4469 r = kvm_vm_ioctl_get_irqchip(kvm, chip); 4470 if (r) 4471 goto get_irqchip_out; 4472 r = -EFAULT; 4473 if (copy_to_user(argp, chip, sizeof *chip)) 4474 goto get_irqchip_out; 4475 r = 0; 4476 get_irqchip_out: 4477 kfree(chip); 4478 break; 4479 } 4480 case KVM_SET_IRQCHIP: { 4481 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4482 struct kvm_irqchip *chip; 4483 4484 chip = memdup_user(argp, sizeof(*chip)); 4485 if (IS_ERR(chip)) { 4486 r = PTR_ERR(chip); 4487 goto out; 4488 } 4489 4490 r = -ENXIO; 4491 if (!irqchip_kernel(kvm)) 4492 goto set_irqchip_out; 4493 r = kvm_vm_ioctl_set_irqchip(kvm, chip); 4494 if (r) 4495 goto set_irqchip_out; 4496 r = 0; 4497 set_irqchip_out: 4498 kfree(chip); 4499 break; 4500 } 4501 case KVM_GET_PIT: { 4502 r = -EFAULT; 4503 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) 4504 goto out; 4505 r = -ENXIO; 4506 if (!kvm->arch.vpit) 4507 goto out; 4508 r = kvm_vm_ioctl_get_pit(kvm, &u.ps); 4509 if (r) 4510 goto out; 4511 r = -EFAULT; 4512 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) 4513 goto out; 4514 r = 0; 4515 break; 4516 } 4517 case KVM_SET_PIT: { 4518 r = -EFAULT; 4519 if (copy_from_user(&u.ps, argp, sizeof u.ps)) 4520 goto out; 4521 r = -ENXIO; 4522 if (!kvm->arch.vpit) 4523 goto out; 4524 r = kvm_vm_ioctl_set_pit(kvm, &u.ps); 4525 break; 4526 } 4527 case KVM_GET_PIT2: { 4528 r = -ENXIO; 4529 if (!kvm->arch.vpit) 4530 goto out; 4531 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); 4532 if (r) 4533 goto out; 4534 r = -EFAULT; 4535 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) 4536 goto out; 4537 r = 0; 4538 break; 4539 } 4540 case KVM_SET_PIT2: { 4541 r = -EFAULT; 4542 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) 4543 goto out; 4544 r = -ENXIO; 4545 if (!kvm->arch.vpit) 4546 goto out; 4547 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); 4548 break; 4549 } 4550 case KVM_REINJECT_CONTROL: { 4551 struct kvm_reinject_control control; 4552 r = -EFAULT; 4553 if (copy_from_user(&control, argp, sizeof(control))) 4554 goto out; 4555 r = kvm_vm_ioctl_reinject(kvm, &control); 4556 break; 4557 } 4558 case KVM_SET_BOOT_CPU_ID: 4559 r = 0; 4560 mutex_lock(&kvm->lock); 4561 if (kvm->created_vcpus) 4562 r = -EBUSY; 4563 else 4564 kvm->arch.bsp_vcpu_id = arg; 4565 mutex_unlock(&kvm->lock); 4566 break; 4567 case KVM_XEN_HVM_CONFIG: { 4568 struct kvm_xen_hvm_config xhc; 4569 r = -EFAULT; 4570 if (copy_from_user(&xhc, argp, sizeof(xhc))) 4571 goto out; 4572 r = -EINVAL; 4573 if (xhc.flags) 4574 goto out; 4575 memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc)); 4576 r = 0; 4577 break; 4578 } 4579 case KVM_SET_CLOCK: { 4580 struct kvm_clock_data user_ns; 4581 u64 now_ns; 4582 4583 r = -EFAULT; 4584 if (copy_from_user(&user_ns, argp, sizeof(user_ns))) 4585 goto out; 4586 4587 r = -EINVAL; 4588 if (user_ns.flags) 4589 goto out; 4590 4591 r = 0; 4592 /* 4593 * TODO: userspace has to take care of races with VCPU_RUN, so 4594 * kvm_gen_update_masterclock() can be cut down to locked 4595 * pvclock_update_vm_gtod_copy(). 4596 */ 4597 kvm_gen_update_masterclock(kvm); 4598 now_ns = get_kvmclock_ns(kvm); 4599 kvm->arch.kvmclock_offset += user_ns.clock - now_ns; 4600 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE); 4601 break; 4602 } 4603 case KVM_GET_CLOCK: { 4604 struct kvm_clock_data user_ns; 4605 u64 now_ns; 4606 4607 now_ns = get_kvmclock_ns(kvm); 4608 user_ns.clock = now_ns; 4609 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0; 4610 memset(&user_ns.pad, 0, sizeof(user_ns.pad)); 4611 4612 r = -EFAULT; 4613 if (copy_to_user(argp, &user_ns, sizeof(user_ns))) 4614 goto out; 4615 r = 0; 4616 break; 4617 } 4618 case KVM_ENABLE_CAP: { 4619 struct kvm_enable_cap cap; 4620 4621 r = -EFAULT; 4622 if (copy_from_user(&cap, argp, sizeof(cap))) 4623 goto out; 4624 r = kvm_vm_ioctl_enable_cap(kvm, &cap); 4625 break; 4626 } 4627 case KVM_MEMORY_ENCRYPT_OP: { 4628 r = -ENOTTY; 4629 if (kvm_x86_ops->mem_enc_op) 4630 r = kvm_x86_ops->mem_enc_op(kvm, argp); 4631 break; 4632 } 4633 case KVM_MEMORY_ENCRYPT_REG_REGION: { 4634 struct kvm_enc_region region; 4635 4636 r = -EFAULT; 4637 if (copy_from_user(®ion, argp, sizeof(region))) 4638 goto out; 4639 4640 r = -ENOTTY; 4641 if (kvm_x86_ops->mem_enc_reg_region) 4642 r = kvm_x86_ops->mem_enc_reg_region(kvm, ®ion); 4643 break; 4644 } 4645 case KVM_MEMORY_ENCRYPT_UNREG_REGION: { 4646 struct kvm_enc_region region; 4647 4648 r = -EFAULT; 4649 if (copy_from_user(®ion, argp, sizeof(region))) 4650 goto out; 4651 4652 r = -ENOTTY; 4653 if (kvm_x86_ops->mem_enc_unreg_region) 4654 r = kvm_x86_ops->mem_enc_unreg_region(kvm, ®ion); 4655 break; 4656 } 4657 case KVM_HYPERV_EVENTFD: { 4658 struct kvm_hyperv_eventfd hvevfd; 4659 4660 r = -EFAULT; 4661 if (copy_from_user(&hvevfd, argp, sizeof(hvevfd))) 4662 goto out; 4663 r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd); 4664 break; 4665 } 4666 default: 4667 r = -ENOTTY; 4668 } 4669 out: 4670 return r; 4671 } 4672 4673 static void kvm_init_msr_list(void) 4674 { 4675 u32 dummy[2]; 4676 unsigned i, j; 4677 4678 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { 4679 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) 4680 continue; 4681 4682 /* 4683 * Even MSRs that are valid in the host may not be exposed 4684 * to the guests in some cases. 4685 */ 4686 switch (msrs_to_save[i]) { 4687 case MSR_IA32_BNDCFGS: 4688 if (!kvm_x86_ops->mpx_supported()) 4689 continue; 4690 break; 4691 case MSR_TSC_AUX: 4692 if (!kvm_x86_ops->rdtscp_supported()) 4693 continue; 4694 break; 4695 default: 4696 break; 4697 } 4698 4699 if (j < i) 4700 msrs_to_save[j] = msrs_to_save[i]; 4701 j++; 4702 } 4703 num_msrs_to_save = j; 4704 4705 for (i = j = 0; i < ARRAY_SIZE(emulated_msrs); i++) { 4706 if (!kvm_x86_ops->has_emulated_msr(emulated_msrs[i])) 4707 continue; 4708 4709 if (j < i) 4710 emulated_msrs[j] = emulated_msrs[i]; 4711 j++; 4712 } 4713 num_emulated_msrs = j; 4714 4715 for (i = j = 0; i < ARRAY_SIZE(msr_based_features); i++) { 4716 struct kvm_msr_entry msr; 4717 4718 msr.index = msr_based_features[i]; 4719 if (kvm_get_msr_feature(&msr)) 4720 continue; 4721 4722 if (j < i) 4723 msr_based_features[j] = msr_based_features[i]; 4724 j++; 4725 } 4726 num_msr_based_features = j; 4727 } 4728 4729 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, 4730 const void *v) 4731 { 4732 int handled = 0; 4733 int n; 4734 4735 do { 4736 n = min(len, 8); 4737 if (!(lapic_in_kernel(vcpu) && 4738 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v)) 4739 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v)) 4740 break; 4741 handled += n; 4742 addr += n; 4743 len -= n; 4744 v += n; 4745 } while (len); 4746 4747 return handled; 4748 } 4749 4750 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) 4751 { 4752 int handled = 0; 4753 int n; 4754 4755 do { 4756 n = min(len, 8); 4757 if (!(lapic_in_kernel(vcpu) && 4758 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev, 4759 addr, n, v)) 4760 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v)) 4761 break; 4762 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v); 4763 handled += n; 4764 addr += n; 4765 len -= n; 4766 v += n; 4767 } while (len); 4768 4769 return handled; 4770 } 4771 4772 static void kvm_set_segment(struct kvm_vcpu *vcpu, 4773 struct kvm_segment *var, int seg) 4774 { 4775 kvm_x86_ops->set_segment(vcpu, var, seg); 4776 } 4777 4778 void kvm_get_segment(struct kvm_vcpu *vcpu, 4779 struct kvm_segment *var, int seg) 4780 { 4781 kvm_x86_ops->get_segment(vcpu, var, seg); 4782 } 4783 4784 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access, 4785 struct x86_exception *exception) 4786 { 4787 gpa_t t_gpa; 4788 4789 BUG_ON(!mmu_is_nested(vcpu)); 4790 4791 /* NPT walks are always user-walks */ 4792 access |= PFERR_USER_MASK; 4793 t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, exception); 4794 4795 return t_gpa; 4796 } 4797 4798 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, 4799 struct x86_exception *exception) 4800 { 4801 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4802 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4803 } 4804 4805 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, 4806 struct x86_exception *exception) 4807 { 4808 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4809 access |= PFERR_FETCH_MASK; 4810 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4811 } 4812 4813 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, 4814 struct x86_exception *exception) 4815 { 4816 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4817 access |= PFERR_WRITE_MASK; 4818 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4819 } 4820 4821 /* uses this to access any guest's mapped memory without checking CPL */ 4822 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, 4823 struct x86_exception *exception) 4824 { 4825 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception); 4826 } 4827 4828 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 4829 struct kvm_vcpu *vcpu, u32 access, 4830 struct x86_exception *exception) 4831 { 4832 void *data = val; 4833 int r = X86EMUL_CONTINUE; 4834 4835 while (bytes) { 4836 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access, 4837 exception); 4838 unsigned offset = addr & (PAGE_SIZE-1); 4839 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); 4840 int ret; 4841 4842 if (gpa == UNMAPPED_GVA) 4843 return X86EMUL_PROPAGATE_FAULT; 4844 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data, 4845 offset, toread); 4846 if (ret < 0) { 4847 r = X86EMUL_IO_NEEDED; 4848 goto out; 4849 } 4850 4851 bytes -= toread; 4852 data += toread; 4853 addr += toread; 4854 } 4855 out: 4856 return r; 4857 } 4858 4859 /* used for instruction fetching */ 4860 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, 4861 gva_t addr, void *val, unsigned int bytes, 4862 struct x86_exception *exception) 4863 { 4864 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4865 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4866 unsigned offset; 4867 int ret; 4868 4869 /* Inline kvm_read_guest_virt_helper for speed. */ 4870 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK, 4871 exception); 4872 if (unlikely(gpa == UNMAPPED_GVA)) 4873 return X86EMUL_PROPAGATE_FAULT; 4874 4875 offset = addr & (PAGE_SIZE-1); 4876 if (WARN_ON(offset + bytes > PAGE_SIZE)) 4877 bytes = (unsigned)PAGE_SIZE - offset; 4878 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val, 4879 offset, bytes); 4880 if (unlikely(ret < 0)) 4881 return X86EMUL_IO_NEEDED; 4882 4883 return X86EMUL_CONTINUE; 4884 } 4885 4886 int kvm_read_guest_virt(struct kvm_vcpu *vcpu, 4887 gva_t addr, void *val, unsigned int bytes, 4888 struct x86_exception *exception) 4889 { 4890 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4891 4892 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, 4893 exception); 4894 } 4895 EXPORT_SYMBOL_GPL(kvm_read_guest_virt); 4896 4897 static int emulator_read_std(struct x86_emulate_ctxt *ctxt, 4898 gva_t addr, void *val, unsigned int bytes, 4899 struct x86_exception *exception, bool system) 4900 { 4901 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4902 u32 access = 0; 4903 4904 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3) 4905 access |= PFERR_USER_MASK; 4906 4907 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception); 4908 } 4909 4910 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, 4911 unsigned long addr, void *val, unsigned int bytes) 4912 { 4913 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4914 int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); 4915 4916 return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; 4917 } 4918 4919 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 4920 struct kvm_vcpu *vcpu, u32 access, 4921 struct x86_exception *exception) 4922 { 4923 void *data = val; 4924 int r = X86EMUL_CONTINUE; 4925 4926 while (bytes) { 4927 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, 4928 access, 4929 exception); 4930 unsigned offset = addr & (PAGE_SIZE-1); 4931 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); 4932 int ret; 4933 4934 if (gpa == UNMAPPED_GVA) 4935 return X86EMUL_PROPAGATE_FAULT; 4936 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); 4937 if (ret < 0) { 4938 r = X86EMUL_IO_NEEDED; 4939 goto out; 4940 } 4941 4942 bytes -= towrite; 4943 data += towrite; 4944 addr += towrite; 4945 } 4946 out: 4947 return r; 4948 } 4949 4950 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, 4951 unsigned int bytes, struct x86_exception *exception, 4952 bool system) 4953 { 4954 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4955 u32 access = PFERR_WRITE_MASK; 4956 4957 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3) 4958 access |= PFERR_USER_MASK; 4959 4960 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 4961 access, exception); 4962 } 4963 4964 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val, 4965 unsigned int bytes, struct x86_exception *exception) 4966 { 4967 /* kvm_write_guest_virt_system can pull in tons of pages. */ 4968 vcpu->arch.l1tf_flush_l1d = true; 4969 4970 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, 4971 PFERR_WRITE_MASK, exception); 4972 } 4973 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); 4974 4975 int handle_ud(struct kvm_vcpu *vcpu) 4976 { 4977 int emul_type = EMULTYPE_TRAP_UD; 4978 enum emulation_result er; 4979 char sig[5]; /* ud2; .ascii "kvm" */ 4980 struct x86_exception e; 4981 4982 if (force_emulation_prefix && 4983 kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu), 4984 sig, sizeof(sig), &e) == 0 && 4985 memcmp(sig, "\xf\xbkvm", sizeof(sig)) == 0) { 4986 kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig)); 4987 emul_type = 0; 4988 } 4989 4990 er = kvm_emulate_instruction(vcpu, emul_type); 4991 if (er == EMULATE_USER_EXIT) 4992 return 0; 4993 if (er != EMULATE_DONE) 4994 kvm_queue_exception(vcpu, UD_VECTOR); 4995 return 1; 4996 } 4997 EXPORT_SYMBOL_GPL(handle_ud); 4998 4999 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 5000 gpa_t gpa, bool write) 5001 { 5002 /* For APIC access vmexit */ 5003 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 5004 return 1; 5005 5006 if (vcpu_match_mmio_gpa(vcpu, gpa)) { 5007 trace_vcpu_match_mmio(gva, gpa, write, true); 5008 return 1; 5009 } 5010 5011 return 0; 5012 } 5013 5014 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 5015 gpa_t *gpa, struct x86_exception *exception, 5016 bool write) 5017 { 5018 u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0) 5019 | (write ? PFERR_WRITE_MASK : 0); 5020 5021 /* 5022 * currently PKRU is only applied to ept enabled guest so 5023 * there is no pkey in EPT page table for L1 guest or EPT 5024 * shadow page table for L2 guest. 5025 */ 5026 if (vcpu_match_mmio_gva(vcpu, gva) 5027 && !permission_fault(vcpu, vcpu->arch.walk_mmu, 5028 vcpu->arch.access, 0, access)) { 5029 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | 5030 (gva & (PAGE_SIZE - 1)); 5031 trace_vcpu_match_mmio(gva, *gpa, write, false); 5032 return 1; 5033 } 5034 5035 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 5036 5037 if (*gpa == UNMAPPED_GVA) 5038 return -1; 5039 5040 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write); 5041 } 5042 5043 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, 5044 const void *val, int bytes) 5045 { 5046 int ret; 5047 5048 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes); 5049 if (ret < 0) 5050 return 0; 5051 kvm_page_track_write(vcpu, gpa, val, bytes); 5052 return 1; 5053 } 5054 5055 struct read_write_emulator_ops { 5056 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val, 5057 int bytes); 5058 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa, 5059 void *val, int bytes); 5060 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 5061 int bytes, void *val); 5062 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 5063 void *val, int bytes); 5064 bool write; 5065 }; 5066 5067 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes) 5068 { 5069 if (vcpu->mmio_read_completed) { 5070 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, 5071 vcpu->mmio_fragments[0].gpa, val); 5072 vcpu->mmio_read_completed = 0; 5073 return 1; 5074 } 5075 5076 return 0; 5077 } 5078 5079 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 5080 void *val, int bytes) 5081 { 5082 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes); 5083 } 5084 5085 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 5086 void *val, int bytes) 5087 { 5088 return emulator_write_phys(vcpu, gpa, val, bytes); 5089 } 5090 5091 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val) 5092 { 5093 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val); 5094 return vcpu_mmio_write(vcpu, gpa, bytes, val); 5095 } 5096 5097 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 5098 void *val, int bytes) 5099 { 5100 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL); 5101 return X86EMUL_IO_NEEDED; 5102 } 5103 5104 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 5105 void *val, int bytes) 5106 { 5107 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0]; 5108 5109 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len)); 5110 return X86EMUL_CONTINUE; 5111 } 5112 5113 static const struct read_write_emulator_ops read_emultor = { 5114 .read_write_prepare = read_prepare, 5115 .read_write_emulate = read_emulate, 5116 .read_write_mmio = vcpu_mmio_read, 5117 .read_write_exit_mmio = read_exit_mmio, 5118 }; 5119 5120 static const struct read_write_emulator_ops write_emultor = { 5121 .read_write_emulate = write_emulate, 5122 .read_write_mmio = write_mmio, 5123 .read_write_exit_mmio = write_exit_mmio, 5124 .write = true, 5125 }; 5126 5127 static int emulator_read_write_onepage(unsigned long addr, void *val, 5128 unsigned int bytes, 5129 struct x86_exception *exception, 5130 struct kvm_vcpu *vcpu, 5131 const struct read_write_emulator_ops *ops) 5132 { 5133 gpa_t gpa; 5134 int handled, ret; 5135 bool write = ops->write; 5136 struct kvm_mmio_fragment *frag; 5137 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5138 5139 /* 5140 * If the exit was due to a NPF we may already have a GPA. 5141 * If the GPA is present, use it to avoid the GVA to GPA table walk. 5142 * Note, this cannot be used on string operations since string 5143 * operation using rep will only have the initial GPA from the NPF 5144 * occurred. 5145 */ 5146 if (vcpu->arch.gpa_available && 5147 emulator_can_use_gpa(ctxt) && 5148 (addr & ~PAGE_MASK) == (vcpu->arch.gpa_val & ~PAGE_MASK)) { 5149 gpa = vcpu->arch.gpa_val; 5150 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write); 5151 } else { 5152 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); 5153 if (ret < 0) 5154 return X86EMUL_PROPAGATE_FAULT; 5155 } 5156 5157 if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes)) 5158 return X86EMUL_CONTINUE; 5159 5160 /* 5161 * Is this MMIO handled locally? 5162 */ 5163 handled = ops->read_write_mmio(vcpu, gpa, bytes, val); 5164 if (handled == bytes) 5165 return X86EMUL_CONTINUE; 5166 5167 gpa += handled; 5168 bytes -= handled; 5169 val += handled; 5170 5171 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS); 5172 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++]; 5173 frag->gpa = gpa; 5174 frag->data = val; 5175 frag->len = bytes; 5176 return X86EMUL_CONTINUE; 5177 } 5178 5179 static int emulator_read_write(struct x86_emulate_ctxt *ctxt, 5180 unsigned long addr, 5181 void *val, unsigned int bytes, 5182 struct x86_exception *exception, 5183 const struct read_write_emulator_ops *ops) 5184 { 5185 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5186 gpa_t gpa; 5187 int rc; 5188 5189 if (ops->read_write_prepare && 5190 ops->read_write_prepare(vcpu, val, bytes)) 5191 return X86EMUL_CONTINUE; 5192 5193 vcpu->mmio_nr_fragments = 0; 5194 5195 /* Crossing a page boundary? */ 5196 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { 5197 int now; 5198 5199 now = -addr & ~PAGE_MASK; 5200 rc = emulator_read_write_onepage(addr, val, now, exception, 5201 vcpu, ops); 5202 5203 if (rc != X86EMUL_CONTINUE) 5204 return rc; 5205 addr += now; 5206 if (ctxt->mode != X86EMUL_MODE_PROT64) 5207 addr = (u32)addr; 5208 val += now; 5209 bytes -= now; 5210 } 5211 5212 rc = emulator_read_write_onepage(addr, val, bytes, exception, 5213 vcpu, ops); 5214 if (rc != X86EMUL_CONTINUE) 5215 return rc; 5216 5217 if (!vcpu->mmio_nr_fragments) 5218 return rc; 5219 5220 gpa = vcpu->mmio_fragments[0].gpa; 5221 5222 vcpu->mmio_needed = 1; 5223 vcpu->mmio_cur_fragment = 0; 5224 5225 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len); 5226 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write; 5227 vcpu->run->exit_reason = KVM_EXIT_MMIO; 5228 vcpu->run->mmio.phys_addr = gpa; 5229 5230 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); 5231 } 5232 5233 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, 5234 unsigned long addr, 5235 void *val, 5236 unsigned int bytes, 5237 struct x86_exception *exception) 5238 { 5239 return emulator_read_write(ctxt, addr, val, bytes, 5240 exception, &read_emultor); 5241 } 5242 5243 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, 5244 unsigned long addr, 5245 const void *val, 5246 unsigned int bytes, 5247 struct x86_exception *exception) 5248 { 5249 return emulator_read_write(ctxt, addr, (void *)val, bytes, 5250 exception, &write_emultor); 5251 } 5252 5253 #define CMPXCHG_TYPE(t, ptr, old, new) \ 5254 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old)) 5255 5256 #ifdef CONFIG_X86_64 5257 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new) 5258 #else 5259 # define CMPXCHG64(ptr, old, new) \ 5260 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old)) 5261 #endif 5262 5263 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, 5264 unsigned long addr, 5265 const void *old, 5266 const void *new, 5267 unsigned int bytes, 5268 struct x86_exception *exception) 5269 { 5270 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5271 gpa_t gpa; 5272 struct page *page; 5273 char *kaddr; 5274 bool exchanged; 5275 5276 /* guests cmpxchg8b have to be emulated atomically */ 5277 if (bytes > 8 || (bytes & (bytes - 1))) 5278 goto emul_write; 5279 5280 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); 5281 5282 if (gpa == UNMAPPED_GVA || 5283 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 5284 goto emul_write; 5285 5286 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) 5287 goto emul_write; 5288 5289 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); 5290 if (is_error_page(page)) 5291 goto emul_write; 5292 5293 kaddr = kmap_atomic(page); 5294 kaddr += offset_in_page(gpa); 5295 switch (bytes) { 5296 case 1: 5297 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new); 5298 break; 5299 case 2: 5300 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new); 5301 break; 5302 case 4: 5303 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new); 5304 break; 5305 case 8: 5306 exchanged = CMPXCHG64(kaddr, old, new); 5307 break; 5308 default: 5309 BUG(); 5310 } 5311 kunmap_atomic(kaddr); 5312 kvm_release_page_dirty(page); 5313 5314 if (!exchanged) 5315 return X86EMUL_CMPXCHG_FAILED; 5316 5317 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); 5318 kvm_page_track_write(vcpu, gpa, new, bytes); 5319 5320 return X86EMUL_CONTINUE; 5321 5322 emul_write: 5323 printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); 5324 5325 return emulator_write_emulated(ctxt, addr, new, bytes, exception); 5326 } 5327 5328 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) 5329 { 5330 int r = 0, i; 5331 5332 for (i = 0; i < vcpu->arch.pio.count; i++) { 5333 if (vcpu->arch.pio.in) 5334 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port, 5335 vcpu->arch.pio.size, pd); 5336 else 5337 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, 5338 vcpu->arch.pio.port, vcpu->arch.pio.size, 5339 pd); 5340 if (r) 5341 break; 5342 pd += vcpu->arch.pio.size; 5343 } 5344 return r; 5345 } 5346 5347 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, 5348 unsigned short port, void *val, 5349 unsigned int count, bool in) 5350 { 5351 vcpu->arch.pio.port = port; 5352 vcpu->arch.pio.in = in; 5353 vcpu->arch.pio.count = count; 5354 vcpu->arch.pio.size = size; 5355 5356 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { 5357 vcpu->arch.pio.count = 0; 5358 return 1; 5359 } 5360 5361 vcpu->run->exit_reason = KVM_EXIT_IO; 5362 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; 5363 vcpu->run->io.size = size; 5364 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; 5365 vcpu->run->io.count = count; 5366 vcpu->run->io.port = port; 5367 5368 return 0; 5369 } 5370 5371 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, 5372 int size, unsigned short port, void *val, 5373 unsigned int count) 5374 { 5375 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5376 int ret; 5377 5378 if (vcpu->arch.pio.count) 5379 goto data_avail; 5380 5381 memset(vcpu->arch.pio_data, 0, size * count); 5382 5383 ret = emulator_pio_in_out(vcpu, size, port, val, count, true); 5384 if (ret) { 5385 data_avail: 5386 memcpy(val, vcpu->arch.pio_data, size * count); 5387 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); 5388 vcpu->arch.pio.count = 0; 5389 return 1; 5390 } 5391 5392 return 0; 5393 } 5394 5395 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, 5396 int size, unsigned short port, 5397 const void *val, unsigned int count) 5398 { 5399 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5400 5401 memcpy(vcpu->arch.pio_data, val, size * count); 5402 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); 5403 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); 5404 } 5405 5406 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) 5407 { 5408 return kvm_x86_ops->get_segment_base(vcpu, seg); 5409 } 5410 5411 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address) 5412 { 5413 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address); 5414 } 5415 5416 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu) 5417 { 5418 if (!need_emulate_wbinvd(vcpu)) 5419 return X86EMUL_CONTINUE; 5420 5421 if (kvm_x86_ops->has_wbinvd_exit()) { 5422 int cpu = get_cpu(); 5423 5424 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 5425 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask, 5426 wbinvd_ipi, NULL, 1); 5427 put_cpu(); 5428 cpumask_clear(vcpu->arch.wbinvd_dirty_mask); 5429 } else 5430 wbinvd(); 5431 return X86EMUL_CONTINUE; 5432 } 5433 5434 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu) 5435 { 5436 kvm_emulate_wbinvd_noskip(vcpu); 5437 return kvm_skip_emulated_instruction(vcpu); 5438 } 5439 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd); 5440 5441 5442 5443 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt) 5444 { 5445 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt)); 5446 } 5447 5448 static int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, 5449 unsigned long *dest) 5450 { 5451 return kvm_get_dr(emul_to_vcpu(ctxt), dr, dest); 5452 } 5453 5454 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, 5455 unsigned long value) 5456 { 5457 5458 return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value); 5459 } 5460 5461 static u64 mk_cr_64(u64 curr_cr, u32 new_val) 5462 { 5463 return (curr_cr & ~((1ULL << 32) - 1)) | new_val; 5464 } 5465 5466 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr) 5467 { 5468 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5469 unsigned long value; 5470 5471 switch (cr) { 5472 case 0: 5473 value = kvm_read_cr0(vcpu); 5474 break; 5475 case 2: 5476 value = vcpu->arch.cr2; 5477 break; 5478 case 3: 5479 value = kvm_read_cr3(vcpu); 5480 break; 5481 case 4: 5482 value = kvm_read_cr4(vcpu); 5483 break; 5484 case 8: 5485 value = kvm_get_cr8(vcpu); 5486 break; 5487 default: 5488 kvm_err("%s: unexpected cr %u\n", __func__, cr); 5489 return 0; 5490 } 5491 5492 return value; 5493 } 5494 5495 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val) 5496 { 5497 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5498 int res = 0; 5499 5500 switch (cr) { 5501 case 0: 5502 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); 5503 break; 5504 case 2: 5505 vcpu->arch.cr2 = val; 5506 break; 5507 case 3: 5508 res = kvm_set_cr3(vcpu, val); 5509 break; 5510 case 4: 5511 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); 5512 break; 5513 case 8: 5514 res = kvm_set_cr8(vcpu, val); 5515 break; 5516 default: 5517 kvm_err("%s: unexpected cr %u\n", __func__, cr); 5518 res = -1; 5519 } 5520 5521 return res; 5522 } 5523 5524 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt) 5525 { 5526 return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt)); 5527 } 5528 5529 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5530 { 5531 kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt); 5532 } 5533 5534 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5535 { 5536 kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt); 5537 } 5538 5539 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5540 { 5541 kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt); 5542 } 5543 5544 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5545 { 5546 kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt); 5547 } 5548 5549 static unsigned long emulator_get_cached_segment_base( 5550 struct x86_emulate_ctxt *ctxt, int seg) 5551 { 5552 return get_segment_base(emul_to_vcpu(ctxt), seg); 5553 } 5554 5555 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector, 5556 struct desc_struct *desc, u32 *base3, 5557 int seg) 5558 { 5559 struct kvm_segment var; 5560 5561 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg); 5562 *selector = var.selector; 5563 5564 if (var.unusable) { 5565 memset(desc, 0, sizeof(*desc)); 5566 if (base3) 5567 *base3 = 0; 5568 return false; 5569 } 5570 5571 if (var.g) 5572 var.limit >>= 12; 5573 set_desc_limit(desc, var.limit); 5574 set_desc_base(desc, (unsigned long)var.base); 5575 #ifdef CONFIG_X86_64 5576 if (base3) 5577 *base3 = var.base >> 32; 5578 #endif 5579 desc->type = var.type; 5580 desc->s = var.s; 5581 desc->dpl = var.dpl; 5582 desc->p = var.present; 5583 desc->avl = var.avl; 5584 desc->l = var.l; 5585 desc->d = var.db; 5586 desc->g = var.g; 5587 5588 return true; 5589 } 5590 5591 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector, 5592 struct desc_struct *desc, u32 base3, 5593 int seg) 5594 { 5595 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5596 struct kvm_segment var; 5597 5598 var.selector = selector; 5599 var.base = get_desc_base(desc); 5600 #ifdef CONFIG_X86_64 5601 var.base |= ((u64)base3) << 32; 5602 #endif 5603 var.limit = get_desc_limit(desc); 5604 if (desc->g) 5605 var.limit = (var.limit << 12) | 0xfff; 5606 var.type = desc->type; 5607 var.dpl = desc->dpl; 5608 var.db = desc->d; 5609 var.s = desc->s; 5610 var.l = desc->l; 5611 var.g = desc->g; 5612 var.avl = desc->avl; 5613 var.present = desc->p; 5614 var.unusable = !var.present; 5615 var.padding = 0; 5616 5617 kvm_set_segment(vcpu, &var, seg); 5618 return; 5619 } 5620 5621 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, 5622 u32 msr_index, u64 *pdata) 5623 { 5624 struct msr_data msr; 5625 int r; 5626 5627 msr.index = msr_index; 5628 msr.host_initiated = false; 5629 r = kvm_get_msr(emul_to_vcpu(ctxt), &msr); 5630 if (r) 5631 return r; 5632 5633 *pdata = msr.data; 5634 return 0; 5635 } 5636 5637 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, 5638 u32 msr_index, u64 data) 5639 { 5640 struct msr_data msr; 5641 5642 msr.data = data; 5643 msr.index = msr_index; 5644 msr.host_initiated = false; 5645 return kvm_set_msr(emul_to_vcpu(ctxt), &msr); 5646 } 5647 5648 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt) 5649 { 5650 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5651 5652 return vcpu->arch.smbase; 5653 } 5654 5655 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase) 5656 { 5657 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5658 5659 vcpu->arch.smbase = smbase; 5660 } 5661 5662 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt, 5663 u32 pmc) 5664 { 5665 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt), pmc); 5666 } 5667 5668 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, 5669 u32 pmc, u64 *pdata) 5670 { 5671 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata); 5672 } 5673 5674 static void emulator_halt(struct x86_emulate_ctxt *ctxt) 5675 { 5676 emul_to_vcpu(ctxt)->arch.halt_request = 1; 5677 } 5678 5679 static int emulator_intercept(struct x86_emulate_ctxt *ctxt, 5680 struct x86_instruction_info *info, 5681 enum x86_intercept_stage stage) 5682 { 5683 return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage); 5684 } 5685 5686 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, 5687 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, bool check_limit) 5688 { 5689 return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, check_limit); 5690 } 5691 5692 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) 5693 { 5694 return kvm_register_read(emul_to_vcpu(ctxt), reg); 5695 } 5696 5697 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) 5698 { 5699 kvm_register_write(emul_to_vcpu(ctxt), reg, val); 5700 } 5701 5702 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked) 5703 { 5704 kvm_x86_ops->set_nmi_mask(emul_to_vcpu(ctxt), masked); 5705 } 5706 5707 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt) 5708 { 5709 return emul_to_vcpu(ctxt)->arch.hflags; 5710 } 5711 5712 static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags) 5713 { 5714 kvm_set_hflags(emul_to_vcpu(ctxt), emul_flags); 5715 } 5716 5717 static int emulator_pre_leave_smm(struct x86_emulate_ctxt *ctxt, u64 smbase) 5718 { 5719 return kvm_x86_ops->pre_leave_smm(emul_to_vcpu(ctxt), smbase); 5720 } 5721 5722 static const struct x86_emulate_ops emulate_ops = { 5723 .read_gpr = emulator_read_gpr, 5724 .write_gpr = emulator_write_gpr, 5725 .read_std = emulator_read_std, 5726 .write_std = emulator_write_std, 5727 .read_phys = kvm_read_guest_phys_system, 5728 .fetch = kvm_fetch_guest_virt, 5729 .read_emulated = emulator_read_emulated, 5730 .write_emulated = emulator_write_emulated, 5731 .cmpxchg_emulated = emulator_cmpxchg_emulated, 5732 .invlpg = emulator_invlpg, 5733 .pio_in_emulated = emulator_pio_in_emulated, 5734 .pio_out_emulated = emulator_pio_out_emulated, 5735 .get_segment = emulator_get_segment, 5736 .set_segment = emulator_set_segment, 5737 .get_cached_segment_base = emulator_get_cached_segment_base, 5738 .get_gdt = emulator_get_gdt, 5739 .get_idt = emulator_get_idt, 5740 .set_gdt = emulator_set_gdt, 5741 .set_idt = emulator_set_idt, 5742 .get_cr = emulator_get_cr, 5743 .set_cr = emulator_set_cr, 5744 .cpl = emulator_get_cpl, 5745 .get_dr = emulator_get_dr, 5746 .set_dr = emulator_set_dr, 5747 .get_smbase = emulator_get_smbase, 5748 .set_smbase = emulator_set_smbase, 5749 .set_msr = emulator_set_msr, 5750 .get_msr = emulator_get_msr, 5751 .check_pmc = emulator_check_pmc, 5752 .read_pmc = emulator_read_pmc, 5753 .halt = emulator_halt, 5754 .wbinvd = emulator_wbinvd, 5755 .fix_hypercall = emulator_fix_hypercall, 5756 .intercept = emulator_intercept, 5757 .get_cpuid = emulator_get_cpuid, 5758 .set_nmi_mask = emulator_set_nmi_mask, 5759 .get_hflags = emulator_get_hflags, 5760 .set_hflags = emulator_set_hflags, 5761 .pre_leave_smm = emulator_pre_leave_smm, 5762 }; 5763 5764 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) 5765 { 5766 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 5767 /* 5768 * an sti; sti; sequence only disable interrupts for the first 5769 * instruction. So, if the last instruction, be it emulated or 5770 * not, left the system with the INT_STI flag enabled, it 5771 * means that the last instruction is an sti. We should not 5772 * leave the flag on in this case. The same goes for mov ss 5773 */ 5774 if (int_shadow & mask) 5775 mask = 0; 5776 if (unlikely(int_shadow || mask)) { 5777 kvm_x86_ops->set_interrupt_shadow(vcpu, mask); 5778 if (!mask) 5779 kvm_make_request(KVM_REQ_EVENT, vcpu); 5780 } 5781 } 5782 5783 static bool inject_emulated_exception(struct kvm_vcpu *vcpu) 5784 { 5785 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5786 if (ctxt->exception.vector == PF_VECTOR) 5787 return kvm_propagate_fault(vcpu, &ctxt->exception); 5788 5789 if (ctxt->exception.error_code_valid) 5790 kvm_queue_exception_e(vcpu, ctxt->exception.vector, 5791 ctxt->exception.error_code); 5792 else 5793 kvm_queue_exception(vcpu, ctxt->exception.vector); 5794 return false; 5795 } 5796 5797 static void init_emulate_ctxt(struct kvm_vcpu *vcpu) 5798 { 5799 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5800 int cs_db, cs_l; 5801 5802 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 5803 5804 ctxt->eflags = kvm_get_rflags(vcpu); 5805 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0; 5806 5807 ctxt->eip = kvm_rip_read(vcpu); 5808 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : 5809 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : 5810 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 : 5811 cs_db ? X86EMUL_MODE_PROT32 : 5812 X86EMUL_MODE_PROT16; 5813 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK); 5814 BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); 5815 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK); 5816 5817 init_decode_cache(ctxt); 5818 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 5819 } 5820 5821 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) 5822 { 5823 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5824 int ret; 5825 5826 init_emulate_ctxt(vcpu); 5827 5828 ctxt->op_bytes = 2; 5829 ctxt->ad_bytes = 2; 5830 ctxt->_eip = ctxt->eip + inc_eip; 5831 ret = emulate_int_real(ctxt, irq); 5832 5833 if (ret != X86EMUL_CONTINUE) 5834 return EMULATE_FAIL; 5835 5836 ctxt->eip = ctxt->_eip; 5837 kvm_rip_write(vcpu, ctxt->eip); 5838 kvm_set_rflags(vcpu, ctxt->eflags); 5839 5840 return EMULATE_DONE; 5841 } 5842 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt); 5843 5844 static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type) 5845 { 5846 int r = EMULATE_DONE; 5847 5848 ++vcpu->stat.insn_emulation_fail; 5849 trace_kvm_emulate_insn_failed(vcpu); 5850 5851 if (emulation_type & EMULTYPE_NO_UD_ON_FAIL) 5852 return EMULATE_FAIL; 5853 5854 if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) { 5855 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 5856 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 5857 vcpu->run->internal.ndata = 0; 5858 r = EMULATE_USER_EXIT; 5859 } 5860 5861 kvm_queue_exception(vcpu, UD_VECTOR); 5862 5863 return r; 5864 } 5865 5866 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2, 5867 bool write_fault_to_shadow_pgtable, 5868 int emulation_type) 5869 { 5870 gpa_t gpa = cr2; 5871 kvm_pfn_t pfn; 5872 5873 if (!(emulation_type & EMULTYPE_ALLOW_RETRY)) 5874 return false; 5875 5876 if (WARN_ON_ONCE(is_guest_mode(vcpu))) 5877 return false; 5878 5879 if (!vcpu->arch.mmu.direct_map) { 5880 /* 5881 * Write permission should be allowed since only 5882 * write access need to be emulated. 5883 */ 5884 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 5885 5886 /* 5887 * If the mapping is invalid in guest, let cpu retry 5888 * it to generate fault. 5889 */ 5890 if (gpa == UNMAPPED_GVA) 5891 return true; 5892 } 5893 5894 /* 5895 * Do not retry the unhandleable instruction if it faults on the 5896 * readonly host memory, otherwise it will goto a infinite loop: 5897 * retry instruction -> write #PF -> emulation fail -> retry 5898 * instruction -> ... 5899 */ 5900 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); 5901 5902 /* 5903 * If the instruction failed on the error pfn, it can not be fixed, 5904 * report the error to userspace. 5905 */ 5906 if (is_error_noslot_pfn(pfn)) 5907 return false; 5908 5909 kvm_release_pfn_clean(pfn); 5910 5911 /* The instructions are well-emulated on direct mmu. */ 5912 if (vcpu->arch.mmu.direct_map) { 5913 unsigned int indirect_shadow_pages; 5914 5915 spin_lock(&vcpu->kvm->mmu_lock); 5916 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; 5917 spin_unlock(&vcpu->kvm->mmu_lock); 5918 5919 if (indirect_shadow_pages) 5920 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5921 5922 return true; 5923 } 5924 5925 /* 5926 * if emulation was due to access to shadowed page table 5927 * and it failed try to unshadow page and re-enter the 5928 * guest to let CPU execute the instruction. 5929 */ 5930 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5931 5932 /* 5933 * If the access faults on its page table, it can not 5934 * be fixed by unprotecting shadow page and it should 5935 * be reported to userspace. 5936 */ 5937 return !write_fault_to_shadow_pgtable; 5938 } 5939 5940 static bool retry_instruction(struct x86_emulate_ctxt *ctxt, 5941 unsigned long cr2, int emulation_type) 5942 { 5943 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5944 unsigned long last_retry_eip, last_retry_addr, gpa = cr2; 5945 5946 last_retry_eip = vcpu->arch.last_retry_eip; 5947 last_retry_addr = vcpu->arch.last_retry_addr; 5948 5949 /* 5950 * If the emulation is caused by #PF and it is non-page_table 5951 * writing instruction, it means the VM-EXIT is caused by shadow 5952 * page protected, we can zap the shadow page and retry this 5953 * instruction directly. 5954 * 5955 * Note: if the guest uses a non-page-table modifying instruction 5956 * on the PDE that points to the instruction, then we will unmap 5957 * the instruction and go to an infinite loop. So, we cache the 5958 * last retried eip and the last fault address, if we meet the eip 5959 * and the address again, we can break out of the potential infinite 5960 * loop. 5961 */ 5962 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0; 5963 5964 if (!(emulation_type & EMULTYPE_ALLOW_RETRY)) 5965 return false; 5966 5967 if (WARN_ON_ONCE(is_guest_mode(vcpu))) 5968 return false; 5969 5970 if (x86_page_table_writing_insn(ctxt)) 5971 return false; 5972 5973 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2) 5974 return false; 5975 5976 vcpu->arch.last_retry_eip = ctxt->eip; 5977 vcpu->arch.last_retry_addr = cr2; 5978 5979 if (!vcpu->arch.mmu.direct_map) 5980 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 5981 5982 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5983 5984 return true; 5985 } 5986 5987 static int complete_emulated_mmio(struct kvm_vcpu *vcpu); 5988 static int complete_emulated_pio(struct kvm_vcpu *vcpu); 5989 5990 static void kvm_smm_changed(struct kvm_vcpu *vcpu) 5991 { 5992 if (!(vcpu->arch.hflags & HF_SMM_MASK)) { 5993 /* This is a good place to trace that we are exiting SMM. */ 5994 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, false); 5995 5996 /* Process a latched INIT or SMI, if any. */ 5997 kvm_make_request(KVM_REQ_EVENT, vcpu); 5998 } 5999 6000 kvm_mmu_reset_context(vcpu); 6001 } 6002 6003 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags) 6004 { 6005 unsigned changed = vcpu->arch.hflags ^ emul_flags; 6006 6007 vcpu->arch.hflags = emul_flags; 6008 6009 if (changed & HF_SMM_MASK) 6010 kvm_smm_changed(vcpu); 6011 } 6012 6013 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7, 6014 unsigned long *db) 6015 { 6016 u32 dr6 = 0; 6017 int i; 6018 u32 enable, rwlen; 6019 6020 enable = dr7; 6021 rwlen = dr7 >> 16; 6022 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4) 6023 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr) 6024 dr6 |= (1 << i); 6025 return dr6; 6026 } 6027 6028 static void kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu, int *r) 6029 { 6030 struct kvm_run *kvm_run = vcpu->run; 6031 6032 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { 6033 kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 | DR6_RTM; 6034 kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip; 6035 kvm_run->debug.arch.exception = DB_VECTOR; 6036 kvm_run->exit_reason = KVM_EXIT_DEBUG; 6037 *r = EMULATE_USER_EXIT; 6038 } else { 6039 /* 6040 * "Certain debug exceptions may clear bit 0-3. The 6041 * remaining contents of the DR6 register are never 6042 * cleared by the processor". 6043 */ 6044 vcpu->arch.dr6 &= ~15; 6045 vcpu->arch.dr6 |= DR6_BS | DR6_RTM; 6046 kvm_queue_exception(vcpu, DB_VECTOR); 6047 } 6048 } 6049 6050 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu) 6051 { 6052 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 6053 int r = EMULATE_DONE; 6054 6055 kvm_x86_ops->skip_emulated_instruction(vcpu); 6056 6057 /* 6058 * rflags is the old, "raw" value of the flags. The new value has 6059 * not been saved yet. 6060 * 6061 * This is correct even for TF set by the guest, because "the 6062 * processor will not generate this exception after the instruction 6063 * that sets the TF flag". 6064 */ 6065 if (unlikely(rflags & X86_EFLAGS_TF)) 6066 kvm_vcpu_do_singlestep(vcpu, &r); 6067 return r == EMULATE_DONE; 6068 } 6069 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction); 6070 6071 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) 6072 { 6073 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) && 6074 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) { 6075 struct kvm_run *kvm_run = vcpu->run; 6076 unsigned long eip = kvm_get_linear_rip(vcpu); 6077 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 6078 vcpu->arch.guest_debug_dr7, 6079 vcpu->arch.eff_db); 6080 6081 if (dr6 != 0) { 6082 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM; 6083 kvm_run->debug.arch.pc = eip; 6084 kvm_run->debug.arch.exception = DB_VECTOR; 6085 kvm_run->exit_reason = KVM_EXIT_DEBUG; 6086 *r = EMULATE_USER_EXIT; 6087 return true; 6088 } 6089 } 6090 6091 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) && 6092 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) { 6093 unsigned long eip = kvm_get_linear_rip(vcpu); 6094 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 6095 vcpu->arch.dr7, 6096 vcpu->arch.db); 6097 6098 if (dr6 != 0) { 6099 vcpu->arch.dr6 &= ~15; 6100 vcpu->arch.dr6 |= dr6 | DR6_RTM; 6101 kvm_queue_exception(vcpu, DB_VECTOR); 6102 *r = EMULATE_DONE; 6103 return true; 6104 } 6105 } 6106 6107 return false; 6108 } 6109 6110 static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt) 6111 { 6112 switch (ctxt->opcode_len) { 6113 case 1: 6114 switch (ctxt->b) { 6115 case 0xe4: /* IN */ 6116 case 0xe5: 6117 case 0xec: 6118 case 0xed: 6119 case 0xe6: /* OUT */ 6120 case 0xe7: 6121 case 0xee: 6122 case 0xef: 6123 case 0x6c: /* INS */ 6124 case 0x6d: 6125 case 0x6e: /* OUTS */ 6126 case 0x6f: 6127 return true; 6128 } 6129 break; 6130 case 2: 6131 switch (ctxt->b) { 6132 case 0x33: /* RDPMC */ 6133 return true; 6134 } 6135 break; 6136 } 6137 6138 return false; 6139 } 6140 6141 int x86_emulate_instruction(struct kvm_vcpu *vcpu, 6142 unsigned long cr2, 6143 int emulation_type, 6144 void *insn, 6145 int insn_len) 6146 { 6147 int r; 6148 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 6149 bool writeback = true; 6150 bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable; 6151 6152 vcpu->arch.l1tf_flush_l1d = true; 6153 6154 /* 6155 * Clear write_fault_to_shadow_pgtable here to ensure it is 6156 * never reused. 6157 */ 6158 vcpu->arch.write_fault_to_shadow_pgtable = false; 6159 kvm_clear_exception_queue(vcpu); 6160 6161 if (!(emulation_type & EMULTYPE_NO_DECODE)) { 6162 init_emulate_ctxt(vcpu); 6163 6164 /* 6165 * We will reenter on the same instruction since 6166 * we do not set complete_userspace_io. This does not 6167 * handle watchpoints yet, those would be handled in 6168 * the emulate_ops. 6169 */ 6170 if (!(emulation_type & EMULTYPE_SKIP) && 6171 kvm_vcpu_check_breakpoint(vcpu, &r)) 6172 return r; 6173 6174 ctxt->interruptibility = 0; 6175 ctxt->have_exception = false; 6176 ctxt->exception.vector = -1; 6177 ctxt->perm_ok = false; 6178 6179 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD; 6180 6181 r = x86_decode_insn(ctxt, insn, insn_len); 6182 6183 trace_kvm_emulate_insn_start(vcpu); 6184 ++vcpu->stat.insn_emulation; 6185 if (r != EMULATION_OK) { 6186 if (emulation_type & EMULTYPE_TRAP_UD) 6187 return EMULATE_FAIL; 6188 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 6189 emulation_type)) 6190 return EMULATE_DONE; 6191 if (ctxt->have_exception && inject_emulated_exception(vcpu)) 6192 return EMULATE_DONE; 6193 if (emulation_type & EMULTYPE_SKIP) 6194 return EMULATE_FAIL; 6195 return handle_emulation_failure(vcpu, emulation_type); 6196 } 6197 } 6198 6199 if ((emulation_type & EMULTYPE_VMWARE) && 6200 !is_vmware_backdoor_opcode(ctxt)) 6201 return EMULATE_FAIL; 6202 6203 if (emulation_type & EMULTYPE_SKIP) { 6204 kvm_rip_write(vcpu, ctxt->_eip); 6205 if (ctxt->eflags & X86_EFLAGS_RF) 6206 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF); 6207 return EMULATE_DONE; 6208 } 6209 6210 if (retry_instruction(ctxt, cr2, emulation_type)) 6211 return EMULATE_DONE; 6212 6213 /* this is needed for vmware backdoor interface to work since it 6214 changes registers values during IO operation */ 6215 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { 6216 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 6217 emulator_invalidate_register_cache(ctxt); 6218 } 6219 6220 restart: 6221 /* Save the faulting GPA (cr2) in the address field */ 6222 ctxt->exception.address = cr2; 6223 6224 r = x86_emulate_insn(ctxt); 6225 6226 if (r == EMULATION_INTERCEPTED) 6227 return EMULATE_DONE; 6228 6229 if (r == EMULATION_FAILED) { 6230 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 6231 emulation_type)) 6232 return EMULATE_DONE; 6233 6234 return handle_emulation_failure(vcpu, emulation_type); 6235 } 6236 6237 if (ctxt->have_exception) { 6238 r = EMULATE_DONE; 6239 if (inject_emulated_exception(vcpu)) 6240 return r; 6241 } else if (vcpu->arch.pio.count) { 6242 if (!vcpu->arch.pio.in) { 6243 /* FIXME: return into emulator if single-stepping. */ 6244 vcpu->arch.pio.count = 0; 6245 } else { 6246 writeback = false; 6247 vcpu->arch.complete_userspace_io = complete_emulated_pio; 6248 } 6249 r = EMULATE_USER_EXIT; 6250 } else if (vcpu->mmio_needed) { 6251 if (!vcpu->mmio_is_write) 6252 writeback = false; 6253 r = EMULATE_USER_EXIT; 6254 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 6255 } else if (r == EMULATION_RESTART) 6256 goto restart; 6257 else 6258 r = EMULATE_DONE; 6259 6260 if (writeback) { 6261 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 6262 toggle_interruptibility(vcpu, ctxt->interruptibility); 6263 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 6264 kvm_rip_write(vcpu, ctxt->eip); 6265 if (r == EMULATE_DONE && 6266 (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP))) 6267 kvm_vcpu_do_singlestep(vcpu, &r); 6268 if (!ctxt->have_exception || 6269 exception_type(ctxt->exception.vector) == EXCPT_TRAP) 6270 __kvm_set_rflags(vcpu, ctxt->eflags); 6271 6272 /* 6273 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will 6274 * do nothing, and it will be requested again as soon as 6275 * the shadow expires. But we still need to check here, 6276 * because POPF has no interrupt shadow. 6277 */ 6278 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF)) 6279 kvm_make_request(KVM_REQ_EVENT, vcpu); 6280 } else 6281 vcpu->arch.emulate_regs_need_sync_to_vcpu = true; 6282 6283 return r; 6284 } 6285 6286 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type) 6287 { 6288 return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0); 6289 } 6290 EXPORT_SYMBOL_GPL(kvm_emulate_instruction); 6291 6292 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu, 6293 void *insn, int insn_len) 6294 { 6295 return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len); 6296 } 6297 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer); 6298 6299 static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, 6300 unsigned short port) 6301 { 6302 unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX); 6303 int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt, 6304 size, port, &val, 1); 6305 /* do not return to emulator after return from userspace */ 6306 vcpu->arch.pio.count = 0; 6307 return ret; 6308 } 6309 6310 static int complete_fast_pio_in(struct kvm_vcpu *vcpu) 6311 { 6312 unsigned long val; 6313 6314 /* We should only ever be called with arch.pio.count equal to 1 */ 6315 BUG_ON(vcpu->arch.pio.count != 1); 6316 6317 /* For size less than 4 we merge, else we zero extend */ 6318 val = (vcpu->arch.pio.size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX) 6319 : 0; 6320 6321 /* 6322 * Since vcpu->arch.pio.count == 1 let emulator_pio_in_emulated perform 6323 * the copy and tracing 6324 */ 6325 emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, vcpu->arch.pio.size, 6326 vcpu->arch.pio.port, &val, 1); 6327 kvm_register_write(vcpu, VCPU_REGS_RAX, val); 6328 6329 return 1; 6330 } 6331 6332 static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, 6333 unsigned short port) 6334 { 6335 unsigned long val; 6336 int ret; 6337 6338 /* For size less than 4 we merge, else we zero extend */ 6339 val = (size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX) : 0; 6340 6341 ret = emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, size, port, 6342 &val, 1); 6343 if (ret) { 6344 kvm_register_write(vcpu, VCPU_REGS_RAX, val); 6345 return ret; 6346 } 6347 6348 vcpu->arch.complete_userspace_io = complete_fast_pio_in; 6349 6350 return 0; 6351 } 6352 6353 int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in) 6354 { 6355 int ret = kvm_skip_emulated_instruction(vcpu); 6356 6357 /* 6358 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered 6359 * KVM_EXIT_DEBUG here. 6360 */ 6361 if (in) 6362 return kvm_fast_pio_in(vcpu, size, port) && ret; 6363 else 6364 return kvm_fast_pio_out(vcpu, size, port) && ret; 6365 } 6366 EXPORT_SYMBOL_GPL(kvm_fast_pio); 6367 6368 static int kvmclock_cpu_down_prep(unsigned int cpu) 6369 { 6370 __this_cpu_write(cpu_tsc_khz, 0); 6371 return 0; 6372 } 6373 6374 static void tsc_khz_changed(void *data) 6375 { 6376 struct cpufreq_freqs *freq = data; 6377 unsigned long khz = 0; 6378 6379 if (data) 6380 khz = freq->new; 6381 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 6382 khz = cpufreq_quick_get(raw_smp_processor_id()); 6383 if (!khz) 6384 khz = tsc_khz; 6385 __this_cpu_write(cpu_tsc_khz, khz); 6386 } 6387 6388 #ifdef CONFIG_X86_64 6389 static void kvm_hyperv_tsc_notifier(void) 6390 { 6391 struct kvm *kvm; 6392 struct kvm_vcpu *vcpu; 6393 int cpu; 6394 6395 spin_lock(&kvm_lock); 6396 list_for_each_entry(kvm, &vm_list, vm_list) 6397 kvm_make_mclock_inprogress_request(kvm); 6398 6399 hyperv_stop_tsc_emulation(); 6400 6401 /* TSC frequency always matches when on Hyper-V */ 6402 for_each_present_cpu(cpu) 6403 per_cpu(cpu_tsc_khz, cpu) = tsc_khz; 6404 kvm_max_guest_tsc_khz = tsc_khz; 6405 6406 list_for_each_entry(kvm, &vm_list, vm_list) { 6407 struct kvm_arch *ka = &kvm->arch; 6408 6409 spin_lock(&ka->pvclock_gtod_sync_lock); 6410 6411 pvclock_update_vm_gtod_copy(kvm); 6412 6413 kvm_for_each_vcpu(cpu, vcpu, kvm) 6414 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 6415 6416 kvm_for_each_vcpu(cpu, vcpu, kvm) 6417 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 6418 6419 spin_unlock(&ka->pvclock_gtod_sync_lock); 6420 } 6421 spin_unlock(&kvm_lock); 6422 } 6423 #endif 6424 6425 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 6426 void *data) 6427 { 6428 struct cpufreq_freqs *freq = data; 6429 struct kvm *kvm; 6430 struct kvm_vcpu *vcpu; 6431 int i, send_ipi = 0; 6432 6433 /* 6434 * We allow guests to temporarily run on slowing clocks, 6435 * provided we notify them after, or to run on accelerating 6436 * clocks, provided we notify them before. Thus time never 6437 * goes backwards. 6438 * 6439 * However, we have a problem. We can't atomically update 6440 * the frequency of a given CPU from this function; it is 6441 * merely a notifier, which can be called from any CPU. 6442 * Changing the TSC frequency at arbitrary points in time 6443 * requires a recomputation of local variables related to 6444 * the TSC for each VCPU. We must flag these local variables 6445 * to be updated and be sure the update takes place with the 6446 * new frequency before any guests proceed. 6447 * 6448 * Unfortunately, the combination of hotplug CPU and frequency 6449 * change creates an intractable locking scenario; the order 6450 * of when these callouts happen is undefined with respect to 6451 * CPU hotplug, and they can race with each other. As such, 6452 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is 6453 * undefined; you can actually have a CPU frequency change take 6454 * place in between the computation of X and the setting of the 6455 * variable. To protect against this problem, all updates of 6456 * the per_cpu tsc_khz variable are done in an interrupt 6457 * protected IPI, and all callers wishing to update the value 6458 * must wait for a synchronous IPI to complete (which is trivial 6459 * if the caller is on the CPU already). This establishes the 6460 * necessary total order on variable updates. 6461 * 6462 * Note that because a guest time update may take place 6463 * anytime after the setting of the VCPU's request bit, the 6464 * correct TSC value must be set before the request. However, 6465 * to ensure the update actually makes it to any guest which 6466 * starts running in hardware virtualization between the set 6467 * and the acquisition of the spinlock, we must also ping the 6468 * CPU after setting the request bit. 6469 * 6470 */ 6471 6472 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) 6473 return 0; 6474 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) 6475 return 0; 6476 6477 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); 6478 6479 spin_lock(&kvm_lock); 6480 list_for_each_entry(kvm, &vm_list, vm_list) { 6481 kvm_for_each_vcpu(i, vcpu, kvm) { 6482 if (vcpu->cpu != freq->cpu) 6483 continue; 6484 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 6485 if (vcpu->cpu != smp_processor_id()) 6486 send_ipi = 1; 6487 } 6488 } 6489 spin_unlock(&kvm_lock); 6490 6491 if (freq->old < freq->new && send_ipi) { 6492 /* 6493 * We upscale the frequency. Must make the guest 6494 * doesn't see old kvmclock values while running with 6495 * the new frequency, otherwise we risk the guest sees 6496 * time go backwards. 6497 * 6498 * In case we update the frequency for another cpu 6499 * (which might be in guest context) send an interrupt 6500 * to kick the cpu out of guest context. Next time 6501 * guest context is entered kvmclock will be updated, 6502 * so the guest will not see stale values. 6503 */ 6504 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); 6505 } 6506 return 0; 6507 } 6508 6509 static struct notifier_block kvmclock_cpufreq_notifier_block = { 6510 .notifier_call = kvmclock_cpufreq_notifier 6511 }; 6512 6513 static int kvmclock_cpu_online(unsigned int cpu) 6514 { 6515 tsc_khz_changed(NULL); 6516 return 0; 6517 } 6518 6519 static void kvm_timer_init(void) 6520 { 6521 max_tsc_khz = tsc_khz; 6522 6523 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { 6524 #ifdef CONFIG_CPU_FREQ 6525 struct cpufreq_policy policy; 6526 int cpu; 6527 6528 memset(&policy, 0, sizeof(policy)); 6529 cpu = get_cpu(); 6530 cpufreq_get_policy(&policy, cpu); 6531 if (policy.cpuinfo.max_freq) 6532 max_tsc_khz = policy.cpuinfo.max_freq; 6533 put_cpu(); 6534 #endif 6535 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, 6536 CPUFREQ_TRANSITION_NOTIFIER); 6537 } 6538 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz); 6539 6540 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", 6541 kvmclock_cpu_online, kvmclock_cpu_down_prep); 6542 } 6543 6544 DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); 6545 EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu); 6546 6547 int kvm_is_in_guest(void) 6548 { 6549 return __this_cpu_read(current_vcpu) != NULL; 6550 } 6551 6552 static int kvm_is_user_mode(void) 6553 { 6554 int user_mode = 3; 6555 6556 if (__this_cpu_read(current_vcpu)) 6557 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu)); 6558 6559 return user_mode != 0; 6560 } 6561 6562 static unsigned long kvm_get_guest_ip(void) 6563 { 6564 unsigned long ip = 0; 6565 6566 if (__this_cpu_read(current_vcpu)) 6567 ip = kvm_rip_read(__this_cpu_read(current_vcpu)); 6568 6569 return ip; 6570 } 6571 6572 static struct perf_guest_info_callbacks kvm_guest_cbs = { 6573 .is_in_guest = kvm_is_in_guest, 6574 .is_user_mode = kvm_is_user_mode, 6575 .get_guest_ip = kvm_get_guest_ip, 6576 }; 6577 6578 static void kvm_set_mmio_spte_mask(void) 6579 { 6580 u64 mask; 6581 int maxphyaddr = boot_cpu_data.x86_phys_bits; 6582 6583 /* 6584 * Set the reserved bits and the present bit of an paging-structure 6585 * entry to generate page fault with PFER.RSV = 1. 6586 */ 6587 6588 /* 6589 * Mask the uppermost physical address bit, which would be reserved as 6590 * long as the supported physical address width is less than 52. 6591 */ 6592 mask = 1ull << 51; 6593 6594 /* Set the present bit. */ 6595 mask |= 1ull; 6596 6597 /* 6598 * If reserved bit is not supported, clear the present bit to disable 6599 * mmio page fault. 6600 */ 6601 if (IS_ENABLED(CONFIG_X86_64) && maxphyaddr == 52) 6602 mask &= ~1ull; 6603 6604 kvm_mmu_set_mmio_spte_mask(mask, mask); 6605 } 6606 6607 #ifdef CONFIG_X86_64 6608 static void pvclock_gtod_update_fn(struct work_struct *work) 6609 { 6610 struct kvm *kvm; 6611 6612 struct kvm_vcpu *vcpu; 6613 int i; 6614 6615 spin_lock(&kvm_lock); 6616 list_for_each_entry(kvm, &vm_list, vm_list) 6617 kvm_for_each_vcpu(i, vcpu, kvm) 6618 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 6619 atomic_set(&kvm_guest_has_master_clock, 0); 6620 spin_unlock(&kvm_lock); 6621 } 6622 6623 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn); 6624 6625 /* 6626 * Notification about pvclock gtod data update. 6627 */ 6628 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused, 6629 void *priv) 6630 { 6631 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 6632 struct timekeeper *tk = priv; 6633 6634 update_pvclock_gtod(tk); 6635 6636 /* disable master clock if host does not trust, or does not 6637 * use, TSC based clocksource. 6638 */ 6639 if (!gtod_is_based_on_tsc(gtod->clock.vclock_mode) && 6640 atomic_read(&kvm_guest_has_master_clock) != 0) 6641 queue_work(system_long_wq, &pvclock_gtod_work); 6642 6643 return 0; 6644 } 6645 6646 static struct notifier_block pvclock_gtod_notifier = { 6647 .notifier_call = pvclock_gtod_notify, 6648 }; 6649 #endif 6650 6651 int kvm_arch_init(void *opaque) 6652 { 6653 int r; 6654 struct kvm_x86_ops *ops = opaque; 6655 6656 if (kvm_x86_ops) { 6657 printk(KERN_ERR "kvm: already loaded the other module\n"); 6658 r = -EEXIST; 6659 goto out; 6660 } 6661 6662 if (!ops->cpu_has_kvm_support()) { 6663 printk(KERN_ERR "kvm: no hardware support\n"); 6664 r = -EOPNOTSUPP; 6665 goto out; 6666 } 6667 if (ops->disabled_by_bios()) { 6668 printk(KERN_ERR "kvm: disabled by bios\n"); 6669 r = -EOPNOTSUPP; 6670 goto out; 6671 } 6672 6673 r = -ENOMEM; 6674 shared_msrs = alloc_percpu(struct kvm_shared_msrs); 6675 if (!shared_msrs) { 6676 printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n"); 6677 goto out; 6678 } 6679 6680 r = kvm_mmu_module_init(); 6681 if (r) 6682 goto out_free_percpu; 6683 6684 kvm_set_mmio_spte_mask(); 6685 6686 kvm_x86_ops = ops; 6687 6688 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, 6689 PT_DIRTY_MASK, PT64_NX_MASK, 0, 6690 PT_PRESENT_MASK, 0, sme_me_mask); 6691 kvm_timer_init(); 6692 6693 perf_register_guest_info_callbacks(&kvm_guest_cbs); 6694 6695 if (boot_cpu_has(X86_FEATURE_XSAVE)) 6696 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); 6697 6698 kvm_lapic_init(); 6699 #ifdef CONFIG_X86_64 6700 pvclock_gtod_register_notifier(&pvclock_gtod_notifier); 6701 6702 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 6703 set_hv_tscchange_cb(kvm_hyperv_tsc_notifier); 6704 #endif 6705 6706 return 0; 6707 6708 out_free_percpu: 6709 free_percpu(shared_msrs); 6710 out: 6711 return r; 6712 } 6713 6714 void kvm_arch_exit(void) 6715 { 6716 #ifdef CONFIG_X86_64 6717 if (hypervisor_is_type(X86_HYPER_MS_HYPERV)) 6718 clear_hv_tscchange_cb(); 6719 #endif 6720 kvm_lapic_exit(); 6721 perf_unregister_guest_info_callbacks(&kvm_guest_cbs); 6722 6723 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 6724 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, 6725 CPUFREQ_TRANSITION_NOTIFIER); 6726 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); 6727 #ifdef CONFIG_X86_64 6728 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); 6729 #endif 6730 kvm_x86_ops = NULL; 6731 kvm_mmu_module_exit(); 6732 free_percpu(shared_msrs); 6733 } 6734 6735 int kvm_vcpu_halt(struct kvm_vcpu *vcpu) 6736 { 6737 ++vcpu->stat.halt_exits; 6738 if (lapic_in_kernel(vcpu)) { 6739 vcpu->arch.mp_state = KVM_MP_STATE_HALTED; 6740 return 1; 6741 } else { 6742 vcpu->run->exit_reason = KVM_EXIT_HLT; 6743 return 0; 6744 } 6745 } 6746 EXPORT_SYMBOL_GPL(kvm_vcpu_halt); 6747 6748 int kvm_emulate_halt(struct kvm_vcpu *vcpu) 6749 { 6750 int ret = kvm_skip_emulated_instruction(vcpu); 6751 /* 6752 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered 6753 * KVM_EXIT_DEBUG here. 6754 */ 6755 return kvm_vcpu_halt(vcpu) && ret; 6756 } 6757 EXPORT_SYMBOL_GPL(kvm_emulate_halt); 6758 6759 #ifdef CONFIG_X86_64 6760 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr, 6761 unsigned long clock_type) 6762 { 6763 struct kvm_clock_pairing clock_pairing; 6764 struct timespec64 ts; 6765 u64 cycle; 6766 int ret; 6767 6768 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK) 6769 return -KVM_EOPNOTSUPP; 6770 6771 if (kvm_get_walltime_and_clockread(&ts, &cycle) == false) 6772 return -KVM_EOPNOTSUPP; 6773 6774 clock_pairing.sec = ts.tv_sec; 6775 clock_pairing.nsec = ts.tv_nsec; 6776 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle); 6777 clock_pairing.flags = 0; 6778 6779 ret = 0; 6780 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing, 6781 sizeof(struct kvm_clock_pairing))) 6782 ret = -KVM_EFAULT; 6783 6784 return ret; 6785 } 6786 #endif 6787 6788 /* 6789 * kvm_pv_kick_cpu_op: Kick a vcpu. 6790 * 6791 * @apicid - apicid of vcpu to be kicked. 6792 */ 6793 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) 6794 { 6795 struct kvm_lapic_irq lapic_irq; 6796 6797 lapic_irq.shorthand = 0; 6798 lapic_irq.dest_mode = 0; 6799 lapic_irq.level = 0; 6800 lapic_irq.dest_id = apicid; 6801 lapic_irq.msi_redir_hint = false; 6802 6803 lapic_irq.delivery_mode = APIC_DM_REMRD; 6804 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); 6805 } 6806 6807 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu) 6808 { 6809 vcpu->arch.apicv_active = false; 6810 kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu); 6811 } 6812 6813 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) 6814 { 6815 unsigned long nr, a0, a1, a2, a3, ret; 6816 int op_64_bit; 6817 6818 if (kvm_hv_hypercall_enabled(vcpu->kvm)) 6819 return kvm_hv_hypercall(vcpu); 6820 6821 nr = kvm_register_read(vcpu, VCPU_REGS_RAX); 6822 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX); 6823 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX); 6824 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX); 6825 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI); 6826 6827 trace_kvm_hypercall(nr, a0, a1, a2, a3); 6828 6829 op_64_bit = is_64_bit_mode(vcpu); 6830 if (!op_64_bit) { 6831 nr &= 0xFFFFFFFF; 6832 a0 &= 0xFFFFFFFF; 6833 a1 &= 0xFFFFFFFF; 6834 a2 &= 0xFFFFFFFF; 6835 a3 &= 0xFFFFFFFF; 6836 } 6837 6838 if (kvm_x86_ops->get_cpl(vcpu) != 0) { 6839 ret = -KVM_EPERM; 6840 goto out; 6841 } 6842 6843 switch (nr) { 6844 case KVM_HC_VAPIC_POLL_IRQ: 6845 ret = 0; 6846 break; 6847 case KVM_HC_KICK_CPU: 6848 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1); 6849 ret = 0; 6850 break; 6851 #ifdef CONFIG_X86_64 6852 case KVM_HC_CLOCK_PAIRING: 6853 ret = kvm_pv_clock_pairing(vcpu, a0, a1); 6854 break; 6855 case KVM_HC_SEND_IPI: 6856 ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit); 6857 break; 6858 #endif 6859 default: 6860 ret = -KVM_ENOSYS; 6861 break; 6862 } 6863 out: 6864 if (!op_64_bit) 6865 ret = (u32)ret; 6866 kvm_register_write(vcpu, VCPU_REGS_RAX, ret); 6867 6868 ++vcpu->stat.hypercalls; 6869 return kvm_skip_emulated_instruction(vcpu); 6870 } 6871 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); 6872 6873 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) 6874 { 6875 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6876 char instruction[3]; 6877 unsigned long rip = kvm_rip_read(vcpu); 6878 6879 kvm_x86_ops->patch_hypercall(vcpu, instruction); 6880 6881 return emulator_write_emulated(ctxt, rip, instruction, 3, 6882 &ctxt->exception); 6883 } 6884 6885 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) 6886 { 6887 return vcpu->run->request_interrupt_window && 6888 likely(!pic_in_kernel(vcpu->kvm)); 6889 } 6890 6891 static void post_kvm_run_save(struct kvm_vcpu *vcpu) 6892 { 6893 struct kvm_run *kvm_run = vcpu->run; 6894 6895 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; 6896 kvm_run->flags = is_smm(vcpu) ? KVM_RUN_X86_SMM : 0; 6897 kvm_run->cr8 = kvm_get_cr8(vcpu); 6898 kvm_run->apic_base = kvm_get_apic_base(vcpu); 6899 kvm_run->ready_for_interrupt_injection = 6900 pic_in_kernel(vcpu->kvm) || 6901 kvm_vcpu_ready_for_interrupt_injection(vcpu); 6902 } 6903 6904 static void update_cr8_intercept(struct kvm_vcpu *vcpu) 6905 { 6906 int max_irr, tpr; 6907 6908 if (!kvm_x86_ops->update_cr8_intercept) 6909 return; 6910 6911 if (!lapic_in_kernel(vcpu)) 6912 return; 6913 6914 if (vcpu->arch.apicv_active) 6915 return; 6916 6917 if (!vcpu->arch.apic->vapic_addr) 6918 max_irr = kvm_lapic_find_highest_irr(vcpu); 6919 else 6920 max_irr = -1; 6921 6922 if (max_irr != -1) 6923 max_irr >>= 4; 6924 6925 tpr = kvm_lapic_get_cr8(vcpu); 6926 6927 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr); 6928 } 6929 6930 static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win) 6931 { 6932 int r; 6933 6934 /* try to reinject previous events if any */ 6935 6936 if (vcpu->arch.exception.injected) 6937 kvm_x86_ops->queue_exception(vcpu); 6938 /* 6939 * Do not inject an NMI or interrupt if there is a pending 6940 * exception. Exceptions and interrupts are recognized at 6941 * instruction boundaries, i.e. the start of an instruction. 6942 * Trap-like exceptions, e.g. #DB, have higher priority than 6943 * NMIs and interrupts, i.e. traps are recognized before an 6944 * NMI/interrupt that's pending on the same instruction. 6945 * Fault-like exceptions, e.g. #GP and #PF, are the lowest 6946 * priority, but are only generated (pended) during instruction 6947 * execution, i.e. a pending fault-like exception means the 6948 * fault occurred on the *previous* instruction and must be 6949 * serviced prior to recognizing any new events in order to 6950 * fully complete the previous instruction. 6951 */ 6952 else if (!vcpu->arch.exception.pending) { 6953 if (vcpu->arch.nmi_injected) 6954 kvm_x86_ops->set_nmi(vcpu); 6955 else if (vcpu->arch.interrupt.injected) 6956 kvm_x86_ops->set_irq(vcpu); 6957 } 6958 6959 /* 6960 * Call check_nested_events() even if we reinjected a previous event 6961 * in order for caller to determine if it should require immediate-exit 6962 * from L2 to L1 due to pending L1 events which require exit 6963 * from L2 to L1. 6964 */ 6965 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 6966 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 6967 if (r != 0) 6968 return r; 6969 } 6970 6971 /* try to inject new event if pending */ 6972 if (vcpu->arch.exception.pending) { 6973 trace_kvm_inj_exception(vcpu->arch.exception.nr, 6974 vcpu->arch.exception.has_error_code, 6975 vcpu->arch.exception.error_code); 6976 6977 WARN_ON_ONCE(vcpu->arch.exception.injected); 6978 vcpu->arch.exception.pending = false; 6979 vcpu->arch.exception.injected = true; 6980 6981 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT) 6982 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) | 6983 X86_EFLAGS_RF); 6984 6985 if (vcpu->arch.exception.nr == DB_VECTOR && 6986 (vcpu->arch.dr7 & DR7_GD)) { 6987 vcpu->arch.dr7 &= ~DR7_GD; 6988 kvm_update_dr7(vcpu); 6989 } 6990 6991 kvm_x86_ops->queue_exception(vcpu); 6992 } 6993 6994 /* Don't consider new event if we re-injected an event */ 6995 if (kvm_event_needs_reinjection(vcpu)) 6996 return 0; 6997 6998 if (vcpu->arch.smi_pending && !is_smm(vcpu) && 6999 kvm_x86_ops->smi_allowed(vcpu)) { 7000 vcpu->arch.smi_pending = false; 7001 ++vcpu->arch.smi_count; 7002 enter_smm(vcpu); 7003 } else if (vcpu->arch.nmi_pending && kvm_x86_ops->nmi_allowed(vcpu)) { 7004 --vcpu->arch.nmi_pending; 7005 vcpu->arch.nmi_injected = true; 7006 kvm_x86_ops->set_nmi(vcpu); 7007 } else if (kvm_cpu_has_injectable_intr(vcpu)) { 7008 /* 7009 * Because interrupts can be injected asynchronously, we are 7010 * calling check_nested_events again here to avoid a race condition. 7011 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this 7012 * proposal and current concerns. Perhaps we should be setting 7013 * KVM_REQ_EVENT only on certain events and not unconditionally? 7014 */ 7015 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 7016 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 7017 if (r != 0) 7018 return r; 7019 } 7020 if (kvm_x86_ops->interrupt_allowed(vcpu)) { 7021 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), 7022 false); 7023 kvm_x86_ops->set_irq(vcpu); 7024 } 7025 } 7026 7027 return 0; 7028 } 7029 7030 static void process_nmi(struct kvm_vcpu *vcpu) 7031 { 7032 unsigned limit = 2; 7033 7034 /* 7035 * x86 is limited to one NMI running, and one NMI pending after it. 7036 * If an NMI is already in progress, limit further NMIs to just one. 7037 * Otherwise, allow two (and we'll inject the first one immediately). 7038 */ 7039 if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected) 7040 limit = 1; 7041 7042 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0); 7043 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit); 7044 kvm_make_request(KVM_REQ_EVENT, vcpu); 7045 } 7046 7047 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) 7048 { 7049 u32 flags = 0; 7050 flags |= seg->g << 23; 7051 flags |= seg->db << 22; 7052 flags |= seg->l << 21; 7053 flags |= seg->avl << 20; 7054 flags |= seg->present << 15; 7055 flags |= seg->dpl << 13; 7056 flags |= seg->s << 12; 7057 flags |= seg->type << 8; 7058 return flags; 7059 } 7060 7061 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n) 7062 { 7063 struct kvm_segment seg; 7064 int offset; 7065 7066 kvm_get_segment(vcpu, &seg, n); 7067 put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector); 7068 7069 if (n < 3) 7070 offset = 0x7f84 + n * 12; 7071 else 7072 offset = 0x7f2c + (n - 3) * 12; 7073 7074 put_smstate(u32, buf, offset + 8, seg.base); 7075 put_smstate(u32, buf, offset + 4, seg.limit); 7076 put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg)); 7077 } 7078 7079 #ifdef CONFIG_X86_64 7080 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n) 7081 { 7082 struct kvm_segment seg; 7083 int offset; 7084 u16 flags; 7085 7086 kvm_get_segment(vcpu, &seg, n); 7087 offset = 0x7e00 + n * 16; 7088 7089 flags = enter_smm_get_segment_flags(&seg) >> 8; 7090 put_smstate(u16, buf, offset, seg.selector); 7091 put_smstate(u16, buf, offset + 2, flags); 7092 put_smstate(u32, buf, offset + 4, seg.limit); 7093 put_smstate(u64, buf, offset + 8, seg.base); 7094 } 7095 #endif 7096 7097 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf) 7098 { 7099 struct desc_ptr dt; 7100 struct kvm_segment seg; 7101 unsigned long val; 7102 int i; 7103 7104 put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu)); 7105 put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu)); 7106 put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu)); 7107 put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu)); 7108 7109 for (i = 0; i < 8; i++) 7110 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read(vcpu, i)); 7111 7112 kvm_get_dr(vcpu, 6, &val); 7113 put_smstate(u32, buf, 0x7fcc, (u32)val); 7114 kvm_get_dr(vcpu, 7, &val); 7115 put_smstate(u32, buf, 0x7fc8, (u32)val); 7116 7117 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 7118 put_smstate(u32, buf, 0x7fc4, seg.selector); 7119 put_smstate(u32, buf, 0x7f64, seg.base); 7120 put_smstate(u32, buf, 0x7f60, seg.limit); 7121 put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg)); 7122 7123 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 7124 put_smstate(u32, buf, 0x7fc0, seg.selector); 7125 put_smstate(u32, buf, 0x7f80, seg.base); 7126 put_smstate(u32, buf, 0x7f7c, seg.limit); 7127 put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg)); 7128 7129 kvm_x86_ops->get_gdt(vcpu, &dt); 7130 put_smstate(u32, buf, 0x7f74, dt.address); 7131 put_smstate(u32, buf, 0x7f70, dt.size); 7132 7133 kvm_x86_ops->get_idt(vcpu, &dt); 7134 put_smstate(u32, buf, 0x7f58, dt.address); 7135 put_smstate(u32, buf, 0x7f54, dt.size); 7136 7137 for (i = 0; i < 6; i++) 7138 enter_smm_save_seg_32(vcpu, buf, i); 7139 7140 put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu)); 7141 7142 /* revision id */ 7143 put_smstate(u32, buf, 0x7efc, 0x00020000); 7144 put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase); 7145 } 7146 7147 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) 7148 { 7149 #ifdef CONFIG_X86_64 7150 struct desc_ptr dt; 7151 struct kvm_segment seg; 7152 unsigned long val; 7153 int i; 7154 7155 for (i = 0; i < 16; i++) 7156 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read(vcpu, i)); 7157 7158 put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu)); 7159 put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu)); 7160 7161 kvm_get_dr(vcpu, 6, &val); 7162 put_smstate(u64, buf, 0x7f68, val); 7163 kvm_get_dr(vcpu, 7, &val); 7164 put_smstate(u64, buf, 0x7f60, val); 7165 7166 put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu)); 7167 put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu)); 7168 put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu)); 7169 7170 put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase); 7171 7172 /* revision id */ 7173 put_smstate(u32, buf, 0x7efc, 0x00020064); 7174 7175 put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer); 7176 7177 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 7178 put_smstate(u16, buf, 0x7e90, seg.selector); 7179 put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8); 7180 put_smstate(u32, buf, 0x7e94, seg.limit); 7181 put_smstate(u64, buf, 0x7e98, seg.base); 7182 7183 kvm_x86_ops->get_idt(vcpu, &dt); 7184 put_smstate(u32, buf, 0x7e84, dt.size); 7185 put_smstate(u64, buf, 0x7e88, dt.address); 7186 7187 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 7188 put_smstate(u16, buf, 0x7e70, seg.selector); 7189 put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8); 7190 put_smstate(u32, buf, 0x7e74, seg.limit); 7191 put_smstate(u64, buf, 0x7e78, seg.base); 7192 7193 kvm_x86_ops->get_gdt(vcpu, &dt); 7194 put_smstate(u32, buf, 0x7e64, dt.size); 7195 put_smstate(u64, buf, 0x7e68, dt.address); 7196 7197 for (i = 0; i < 6; i++) 7198 enter_smm_save_seg_64(vcpu, buf, i); 7199 #else 7200 WARN_ON_ONCE(1); 7201 #endif 7202 } 7203 7204 static void enter_smm(struct kvm_vcpu *vcpu) 7205 { 7206 struct kvm_segment cs, ds; 7207 struct desc_ptr dt; 7208 char buf[512]; 7209 u32 cr0; 7210 7211 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true); 7212 memset(buf, 0, 512); 7213 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 7214 enter_smm_save_state_64(vcpu, buf); 7215 else 7216 enter_smm_save_state_32(vcpu, buf); 7217 7218 /* 7219 * Give pre_enter_smm() a chance to make ISA-specific changes to the 7220 * vCPU state (e.g. leave guest mode) after we've saved the state into 7221 * the SMM state-save area. 7222 */ 7223 kvm_x86_ops->pre_enter_smm(vcpu, buf); 7224 7225 vcpu->arch.hflags |= HF_SMM_MASK; 7226 kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); 7227 7228 if (kvm_x86_ops->get_nmi_mask(vcpu)) 7229 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 7230 else 7231 kvm_x86_ops->set_nmi_mask(vcpu, true); 7232 7233 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); 7234 kvm_rip_write(vcpu, 0x8000); 7235 7236 cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); 7237 kvm_x86_ops->set_cr0(vcpu, cr0); 7238 vcpu->arch.cr0 = cr0; 7239 7240 kvm_x86_ops->set_cr4(vcpu, 0); 7241 7242 /* Undocumented: IDT limit is set to zero on entry to SMM. */ 7243 dt.address = dt.size = 0; 7244 kvm_x86_ops->set_idt(vcpu, &dt); 7245 7246 __kvm_set_dr(vcpu, 7, DR7_FIXED_1); 7247 7248 cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; 7249 cs.base = vcpu->arch.smbase; 7250 7251 ds.selector = 0; 7252 ds.base = 0; 7253 7254 cs.limit = ds.limit = 0xffffffff; 7255 cs.type = ds.type = 0x3; 7256 cs.dpl = ds.dpl = 0; 7257 cs.db = ds.db = 0; 7258 cs.s = ds.s = 1; 7259 cs.l = ds.l = 0; 7260 cs.g = ds.g = 1; 7261 cs.avl = ds.avl = 0; 7262 cs.present = ds.present = 1; 7263 cs.unusable = ds.unusable = 0; 7264 cs.padding = ds.padding = 0; 7265 7266 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 7267 kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); 7268 kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); 7269 kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); 7270 kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); 7271 kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); 7272 7273 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) 7274 kvm_x86_ops->set_efer(vcpu, 0); 7275 7276 kvm_update_cpuid(vcpu); 7277 kvm_mmu_reset_context(vcpu); 7278 } 7279 7280 static void process_smi(struct kvm_vcpu *vcpu) 7281 { 7282 vcpu->arch.smi_pending = true; 7283 kvm_make_request(KVM_REQ_EVENT, vcpu); 7284 } 7285 7286 void kvm_make_scan_ioapic_request(struct kvm *kvm) 7287 { 7288 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); 7289 } 7290 7291 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu) 7292 { 7293 if (!kvm_apic_hw_enabled(vcpu->arch.apic)) 7294 return; 7295 7296 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256); 7297 7298 if (irqchip_split(vcpu->kvm)) 7299 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors); 7300 else { 7301 if (vcpu->arch.apicv_active) 7302 kvm_x86_ops->sync_pir_to_irr(vcpu); 7303 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors); 7304 } 7305 7306 if (is_guest_mode(vcpu)) 7307 vcpu->arch.load_eoi_exitmap_pending = true; 7308 else 7309 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); 7310 } 7311 7312 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu) 7313 { 7314 u64 eoi_exit_bitmap[4]; 7315 7316 if (!kvm_apic_hw_enabled(vcpu->arch.apic)) 7317 return; 7318 7319 bitmap_or((ulong *)eoi_exit_bitmap, vcpu->arch.ioapic_handled_vectors, 7320 vcpu_to_synic(vcpu)->vec_bitmap, 256); 7321 kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap); 7322 } 7323 7324 int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, 7325 unsigned long start, unsigned long end, 7326 bool blockable) 7327 { 7328 unsigned long apic_address; 7329 7330 /* 7331 * The physical address of apic access page is stored in the VMCS. 7332 * Update it when it becomes invalid. 7333 */ 7334 apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 7335 if (start <= apic_address && apic_address < end) 7336 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); 7337 7338 return 0; 7339 } 7340 7341 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) 7342 { 7343 struct page *page = NULL; 7344 7345 if (!lapic_in_kernel(vcpu)) 7346 return; 7347 7348 if (!kvm_x86_ops->set_apic_access_page_addr) 7349 return; 7350 7351 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 7352 if (is_error_page(page)) 7353 return; 7354 kvm_x86_ops->set_apic_access_page_addr(vcpu, page_to_phys(page)); 7355 7356 /* 7357 * Do not pin apic access page in memory, the MMU notifier 7358 * will call us again if it is migrated or swapped out. 7359 */ 7360 put_page(page); 7361 } 7362 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page); 7363 7364 /* 7365 * Returns 1 to let vcpu_run() continue the guest execution loop without 7366 * exiting to the userspace. Otherwise, the value will be returned to the 7367 * userspace. 7368 */ 7369 static int vcpu_enter_guest(struct kvm_vcpu *vcpu) 7370 { 7371 int r; 7372 bool req_int_win = 7373 dm_request_for_irq_injection(vcpu) && 7374 kvm_cpu_accept_dm_intr(vcpu); 7375 7376 bool req_immediate_exit = false; 7377 7378 if (kvm_request_pending(vcpu)) { 7379 if (kvm_check_request(KVM_REQ_GET_VMCS12_PAGES, vcpu)) 7380 kvm_x86_ops->get_vmcs12_pages(vcpu); 7381 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) 7382 kvm_mmu_unload(vcpu); 7383 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu)) 7384 __kvm_migrate_timers(vcpu); 7385 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu)) 7386 kvm_gen_update_masterclock(vcpu->kvm); 7387 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu)) 7388 kvm_gen_kvmclock_update(vcpu); 7389 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) { 7390 r = kvm_guest_time_update(vcpu); 7391 if (unlikely(r)) 7392 goto out; 7393 } 7394 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) 7395 kvm_mmu_sync_roots(vcpu); 7396 if (kvm_check_request(KVM_REQ_LOAD_CR3, vcpu)) 7397 kvm_mmu_load_cr3(vcpu); 7398 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) 7399 kvm_vcpu_flush_tlb(vcpu, true); 7400 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { 7401 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; 7402 r = 0; 7403 goto out; 7404 } 7405 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { 7406 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; 7407 vcpu->mmio_needed = 0; 7408 r = 0; 7409 goto out; 7410 } 7411 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { 7412 /* Page is swapped out. Do synthetic halt */ 7413 vcpu->arch.apf.halted = true; 7414 r = 1; 7415 goto out; 7416 } 7417 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) 7418 record_steal_time(vcpu); 7419 if (kvm_check_request(KVM_REQ_SMI, vcpu)) 7420 process_smi(vcpu); 7421 if (kvm_check_request(KVM_REQ_NMI, vcpu)) 7422 process_nmi(vcpu); 7423 if (kvm_check_request(KVM_REQ_PMU, vcpu)) 7424 kvm_pmu_handle_event(vcpu); 7425 if (kvm_check_request(KVM_REQ_PMI, vcpu)) 7426 kvm_pmu_deliver_pmi(vcpu); 7427 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) { 7428 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255); 7429 if (test_bit(vcpu->arch.pending_ioapic_eoi, 7430 vcpu->arch.ioapic_handled_vectors)) { 7431 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI; 7432 vcpu->run->eoi.vector = 7433 vcpu->arch.pending_ioapic_eoi; 7434 r = 0; 7435 goto out; 7436 } 7437 } 7438 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu)) 7439 vcpu_scan_ioapic(vcpu); 7440 if (kvm_check_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu)) 7441 vcpu_load_eoi_exitmap(vcpu); 7442 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu)) 7443 kvm_vcpu_reload_apic_access_page(vcpu); 7444 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) { 7445 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 7446 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH; 7447 r = 0; 7448 goto out; 7449 } 7450 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) { 7451 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 7452 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET; 7453 r = 0; 7454 goto out; 7455 } 7456 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) { 7457 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 7458 vcpu->run->hyperv = vcpu->arch.hyperv.exit; 7459 r = 0; 7460 goto out; 7461 } 7462 7463 /* 7464 * KVM_REQ_HV_STIMER has to be processed after 7465 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers 7466 * depend on the guest clock being up-to-date 7467 */ 7468 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu)) 7469 kvm_hv_process_stimers(vcpu); 7470 } 7471 7472 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) { 7473 ++vcpu->stat.req_event; 7474 kvm_apic_accept_events(vcpu); 7475 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { 7476 r = 1; 7477 goto out; 7478 } 7479 7480 if (inject_pending_event(vcpu, req_int_win) != 0) 7481 req_immediate_exit = true; 7482 else { 7483 /* Enable SMI/NMI/IRQ window open exits if needed. 7484 * 7485 * SMIs have three cases: 7486 * 1) They can be nested, and then there is nothing to 7487 * do here because RSM will cause a vmexit anyway. 7488 * 2) There is an ISA-specific reason why SMI cannot be 7489 * injected, and the moment when this changes can be 7490 * intercepted. 7491 * 3) Or the SMI can be pending because 7492 * inject_pending_event has completed the injection 7493 * of an IRQ or NMI from the previous vmexit, and 7494 * then we request an immediate exit to inject the 7495 * SMI. 7496 */ 7497 if (vcpu->arch.smi_pending && !is_smm(vcpu)) 7498 if (!kvm_x86_ops->enable_smi_window(vcpu)) 7499 req_immediate_exit = true; 7500 if (vcpu->arch.nmi_pending) 7501 kvm_x86_ops->enable_nmi_window(vcpu); 7502 if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win) 7503 kvm_x86_ops->enable_irq_window(vcpu); 7504 WARN_ON(vcpu->arch.exception.pending); 7505 } 7506 7507 if (kvm_lapic_enabled(vcpu)) { 7508 update_cr8_intercept(vcpu); 7509 kvm_lapic_sync_to_vapic(vcpu); 7510 } 7511 } 7512 7513 r = kvm_mmu_reload(vcpu); 7514 if (unlikely(r)) { 7515 goto cancel_injection; 7516 } 7517 7518 preempt_disable(); 7519 7520 kvm_x86_ops->prepare_guest_switch(vcpu); 7521 7522 /* 7523 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt 7524 * IPI are then delayed after guest entry, which ensures that they 7525 * result in virtual interrupt delivery. 7526 */ 7527 local_irq_disable(); 7528 vcpu->mode = IN_GUEST_MODE; 7529 7530 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 7531 7532 /* 7533 * 1) We should set ->mode before checking ->requests. Please see 7534 * the comment in kvm_vcpu_exiting_guest_mode(). 7535 * 7536 * 2) For APICv, we should set ->mode before checking PIR.ON. This 7537 * pairs with the memory barrier implicit in pi_test_and_set_on 7538 * (see vmx_deliver_posted_interrupt). 7539 * 7540 * 3) This also orders the write to mode from any reads to the page 7541 * tables done while the VCPU is running. Please see the comment 7542 * in kvm_flush_remote_tlbs. 7543 */ 7544 smp_mb__after_srcu_read_unlock(); 7545 7546 /* 7547 * This handles the case where a posted interrupt was 7548 * notified with kvm_vcpu_kick. 7549 */ 7550 if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active) 7551 kvm_x86_ops->sync_pir_to_irr(vcpu); 7552 7553 if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) 7554 || need_resched() || signal_pending(current)) { 7555 vcpu->mode = OUTSIDE_GUEST_MODE; 7556 smp_wmb(); 7557 local_irq_enable(); 7558 preempt_enable(); 7559 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 7560 r = 1; 7561 goto cancel_injection; 7562 } 7563 7564 kvm_load_guest_xcr0(vcpu); 7565 7566 if (req_immediate_exit) { 7567 kvm_make_request(KVM_REQ_EVENT, vcpu); 7568 smp_send_reschedule(vcpu->cpu); 7569 } 7570 7571 trace_kvm_entry(vcpu->vcpu_id); 7572 if (lapic_timer_advance_ns) 7573 wait_lapic_expire(vcpu); 7574 guest_enter_irqoff(); 7575 7576 if (unlikely(vcpu->arch.switch_db_regs)) { 7577 set_debugreg(0, 7); 7578 set_debugreg(vcpu->arch.eff_db[0], 0); 7579 set_debugreg(vcpu->arch.eff_db[1], 1); 7580 set_debugreg(vcpu->arch.eff_db[2], 2); 7581 set_debugreg(vcpu->arch.eff_db[3], 3); 7582 set_debugreg(vcpu->arch.dr6, 6); 7583 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 7584 } 7585 7586 kvm_x86_ops->run(vcpu); 7587 7588 /* 7589 * Do this here before restoring debug registers on the host. And 7590 * since we do this before handling the vmexit, a DR access vmexit 7591 * can (a) read the correct value of the debug registers, (b) set 7592 * KVM_DEBUGREG_WONT_EXIT again. 7593 */ 7594 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) { 7595 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP); 7596 kvm_x86_ops->sync_dirty_debug_regs(vcpu); 7597 kvm_update_dr0123(vcpu); 7598 kvm_update_dr6(vcpu); 7599 kvm_update_dr7(vcpu); 7600 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 7601 } 7602 7603 /* 7604 * If the guest has used debug registers, at least dr7 7605 * will be disabled while returning to the host. 7606 * If we don't have active breakpoints in the host, we don't 7607 * care about the messed up debug address registers. But if 7608 * we have some of them active, restore the old state. 7609 */ 7610 if (hw_breakpoint_active()) 7611 hw_breakpoint_restore(); 7612 7613 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); 7614 7615 vcpu->mode = OUTSIDE_GUEST_MODE; 7616 smp_wmb(); 7617 7618 kvm_put_guest_xcr0(vcpu); 7619 7620 kvm_before_interrupt(vcpu); 7621 kvm_x86_ops->handle_external_intr(vcpu); 7622 kvm_after_interrupt(vcpu); 7623 7624 ++vcpu->stat.exits; 7625 7626 guest_exit_irqoff(); 7627 7628 local_irq_enable(); 7629 preempt_enable(); 7630 7631 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 7632 7633 /* 7634 * Profile KVM exit RIPs: 7635 */ 7636 if (unlikely(prof_on == KVM_PROFILING)) { 7637 unsigned long rip = kvm_rip_read(vcpu); 7638 profile_hit(KVM_PROFILING, (void *)rip); 7639 } 7640 7641 if (unlikely(vcpu->arch.tsc_always_catchup)) 7642 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7643 7644 if (vcpu->arch.apic_attention) 7645 kvm_lapic_sync_from_vapic(vcpu); 7646 7647 vcpu->arch.gpa_available = false; 7648 r = kvm_x86_ops->handle_exit(vcpu); 7649 return r; 7650 7651 cancel_injection: 7652 kvm_x86_ops->cancel_injection(vcpu); 7653 if (unlikely(vcpu->arch.apic_attention)) 7654 kvm_lapic_sync_from_vapic(vcpu); 7655 out: 7656 return r; 7657 } 7658 7659 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) 7660 { 7661 if (!kvm_arch_vcpu_runnable(vcpu) && 7662 (!kvm_x86_ops->pre_block || kvm_x86_ops->pre_block(vcpu) == 0)) { 7663 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7664 kvm_vcpu_block(vcpu); 7665 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7666 7667 if (kvm_x86_ops->post_block) 7668 kvm_x86_ops->post_block(vcpu); 7669 7670 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu)) 7671 return 1; 7672 } 7673 7674 kvm_apic_accept_events(vcpu); 7675 switch(vcpu->arch.mp_state) { 7676 case KVM_MP_STATE_HALTED: 7677 vcpu->arch.pv.pv_unhalted = false; 7678 vcpu->arch.mp_state = 7679 KVM_MP_STATE_RUNNABLE; 7680 case KVM_MP_STATE_RUNNABLE: 7681 vcpu->arch.apf.halted = false; 7682 break; 7683 case KVM_MP_STATE_INIT_RECEIVED: 7684 break; 7685 default: 7686 return -EINTR; 7687 break; 7688 } 7689 return 1; 7690 } 7691 7692 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu) 7693 { 7694 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) 7695 kvm_x86_ops->check_nested_events(vcpu, false); 7696 7697 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && 7698 !vcpu->arch.apf.halted); 7699 } 7700 7701 static int vcpu_run(struct kvm_vcpu *vcpu) 7702 { 7703 int r; 7704 struct kvm *kvm = vcpu->kvm; 7705 7706 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7707 vcpu->arch.l1tf_flush_l1d = true; 7708 7709 for (;;) { 7710 if (kvm_vcpu_running(vcpu)) { 7711 r = vcpu_enter_guest(vcpu); 7712 } else { 7713 r = vcpu_block(kvm, vcpu); 7714 } 7715 7716 if (r <= 0) 7717 break; 7718 7719 kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu); 7720 if (kvm_cpu_has_pending_timer(vcpu)) 7721 kvm_inject_pending_timer_irqs(vcpu); 7722 7723 if (dm_request_for_irq_injection(vcpu) && 7724 kvm_vcpu_ready_for_interrupt_injection(vcpu)) { 7725 r = 0; 7726 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; 7727 ++vcpu->stat.request_irq_exits; 7728 break; 7729 } 7730 7731 kvm_check_async_pf_completion(vcpu); 7732 7733 if (signal_pending(current)) { 7734 r = -EINTR; 7735 vcpu->run->exit_reason = KVM_EXIT_INTR; 7736 ++vcpu->stat.signal_exits; 7737 break; 7738 } 7739 if (need_resched()) { 7740 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7741 cond_resched(); 7742 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7743 } 7744 } 7745 7746 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7747 7748 return r; 7749 } 7750 7751 static inline int complete_emulated_io(struct kvm_vcpu *vcpu) 7752 { 7753 int r; 7754 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 7755 r = kvm_emulate_instruction(vcpu, EMULTYPE_NO_DECODE); 7756 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 7757 if (r != EMULATE_DONE) 7758 return 0; 7759 return 1; 7760 } 7761 7762 static int complete_emulated_pio(struct kvm_vcpu *vcpu) 7763 { 7764 BUG_ON(!vcpu->arch.pio.count); 7765 7766 return complete_emulated_io(vcpu); 7767 } 7768 7769 /* 7770 * Implements the following, as a state machine: 7771 * 7772 * read: 7773 * for each fragment 7774 * for each mmio piece in the fragment 7775 * write gpa, len 7776 * exit 7777 * copy data 7778 * execute insn 7779 * 7780 * write: 7781 * for each fragment 7782 * for each mmio piece in the fragment 7783 * write gpa, len 7784 * copy data 7785 * exit 7786 */ 7787 static int complete_emulated_mmio(struct kvm_vcpu *vcpu) 7788 { 7789 struct kvm_run *run = vcpu->run; 7790 struct kvm_mmio_fragment *frag; 7791 unsigned len; 7792 7793 BUG_ON(!vcpu->mmio_needed); 7794 7795 /* Complete previous fragment */ 7796 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment]; 7797 len = min(8u, frag->len); 7798 if (!vcpu->mmio_is_write) 7799 memcpy(frag->data, run->mmio.data, len); 7800 7801 if (frag->len <= 8) { 7802 /* Switch to the next fragment. */ 7803 frag++; 7804 vcpu->mmio_cur_fragment++; 7805 } else { 7806 /* Go forward to the next mmio piece. */ 7807 frag->data += len; 7808 frag->gpa += len; 7809 frag->len -= len; 7810 } 7811 7812 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) { 7813 vcpu->mmio_needed = 0; 7814 7815 /* FIXME: return into emulator if single-stepping. */ 7816 if (vcpu->mmio_is_write) 7817 return 1; 7818 vcpu->mmio_read_completed = 1; 7819 return complete_emulated_io(vcpu); 7820 } 7821 7822 run->exit_reason = KVM_EXIT_MMIO; 7823 run->mmio.phys_addr = frag->gpa; 7824 if (vcpu->mmio_is_write) 7825 memcpy(run->mmio.data, frag->data, min(8u, frag->len)); 7826 run->mmio.len = min(8u, frag->len); 7827 run->mmio.is_write = vcpu->mmio_is_write; 7828 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 7829 return 0; 7830 } 7831 7832 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 7833 { 7834 int r; 7835 7836 vcpu_load(vcpu); 7837 kvm_sigset_activate(vcpu); 7838 kvm_load_guest_fpu(vcpu); 7839 7840 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { 7841 if (kvm_run->immediate_exit) { 7842 r = -EINTR; 7843 goto out; 7844 } 7845 kvm_vcpu_block(vcpu); 7846 kvm_apic_accept_events(vcpu); 7847 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 7848 r = -EAGAIN; 7849 if (signal_pending(current)) { 7850 r = -EINTR; 7851 vcpu->run->exit_reason = KVM_EXIT_INTR; 7852 ++vcpu->stat.signal_exits; 7853 } 7854 goto out; 7855 } 7856 7857 if (vcpu->run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { 7858 r = -EINVAL; 7859 goto out; 7860 } 7861 7862 if (vcpu->run->kvm_dirty_regs) { 7863 r = sync_regs(vcpu); 7864 if (r != 0) 7865 goto out; 7866 } 7867 7868 /* re-sync apic's tpr */ 7869 if (!lapic_in_kernel(vcpu)) { 7870 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) { 7871 r = -EINVAL; 7872 goto out; 7873 } 7874 } 7875 7876 if (unlikely(vcpu->arch.complete_userspace_io)) { 7877 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; 7878 vcpu->arch.complete_userspace_io = NULL; 7879 r = cui(vcpu); 7880 if (r <= 0) 7881 goto out; 7882 } else 7883 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); 7884 7885 if (kvm_run->immediate_exit) 7886 r = -EINTR; 7887 else 7888 r = vcpu_run(vcpu); 7889 7890 out: 7891 kvm_put_guest_fpu(vcpu); 7892 if (vcpu->run->kvm_valid_regs) 7893 store_regs(vcpu); 7894 post_kvm_run_save(vcpu); 7895 kvm_sigset_deactivate(vcpu); 7896 7897 vcpu_put(vcpu); 7898 return r; 7899 } 7900 7901 static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7902 { 7903 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) { 7904 /* 7905 * We are here if userspace calls get_regs() in the middle of 7906 * instruction emulation. Registers state needs to be copied 7907 * back from emulation context to vcpu. Userspace shouldn't do 7908 * that usually, but some bad designed PV devices (vmware 7909 * backdoor interface) need this to work 7910 */ 7911 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt); 7912 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 7913 } 7914 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); 7915 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX); 7916 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX); 7917 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX); 7918 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI); 7919 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI); 7920 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); 7921 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP); 7922 #ifdef CONFIG_X86_64 7923 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8); 7924 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9); 7925 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10); 7926 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11); 7927 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12); 7928 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13); 7929 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14); 7930 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15); 7931 #endif 7932 7933 regs->rip = kvm_rip_read(vcpu); 7934 regs->rflags = kvm_get_rflags(vcpu); 7935 } 7936 7937 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7938 { 7939 vcpu_load(vcpu); 7940 __get_regs(vcpu, regs); 7941 vcpu_put(vcpu); 7942 return 0; 7943 } 7944 7945 static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7946 { 7947 vcpu->arch.emulate_regs_need_sync_from_vcpu = true; 7948 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 7949 7950 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax); 7951 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx); 7952 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx); 7953 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx); 7954 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi); 7955 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi); 7956 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp); 7957 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp); 7958 #ifdef CONFIG_X86_64 7959 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8); 7960 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9); 7961 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10); 7962 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11); 7963 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12); 7964 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13); 7965 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14); 7966 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15); 7967 #endif 7968 7969 kvm_rip_write(vcpu, regs->rip); 7970 kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED); 7971 7972 vcpu->arch.exception.pending = false; 7973 7974 kvm_make_request(KVM_REQ_EVENT, vcpu); 7975 } 7976 7977 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7978 { 7979 vcpu_load(vcpu); 7980 __set_regs(vcpu, regs); 7981 vcpu_put(vcpu); 7982 return 0; 7983 } 7984 7985 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) 7986 { 7987 struct kvm_segment cs; 7988 7989 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 7990 *db = cs.db; 7991 *l = cs.l; 7992 } 7993 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); 7994 7995 static void __get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 7996 { 7997 struct desc_ptr dt; 7998 7999 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 8000 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 8001 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); 8002 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 8003 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 8004 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 8005 8006 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 8007 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 8008 8009 kvm_x86_ops->get_idt(vcpu, &dt); 8010 sregs->idt.limit = dt.size; 8011 sregs->idt.base = dt.address; 8012 kvm_x86_ops->get_gdt(vcpu, &dt); 8013 sregs->gdt.limit = dt.size; 8014 sregs->gdt.base = dt.address; 8015 8016 sregs->cr0 = kvm_read_cr0(vcpu); 8017 sregs->cr2 = vcpu->arch.cr2; 8018 sregs->cr3 = kvm_read_cr3(vcpu); 8019 sregs->cr4 = kvm_read_cr4(vcpu); 8020 sregs->cr8 = kvm_get_cr8(vcpu); 8021 sregs->efer = vcpu->arch.efer; 8022 sregs->apic_base = kvm_get_apic_base(vcpu); 8023 8024 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); 8025 8026 if (vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft) 8027 set_bit(vcpu->arch.interrupt.nr, 8028 (unsigned long *)sregs->interrupt_bitmap); 8029 } 8030 8031 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 8032 struct kvm_sregs *sregs) 8033 { 8034 vcpu_load(vcpu); 8035 __get_sregs(vcpu, sregs); 8036 vcpu_put(vcpu); 8037 return 0; 8038 } 8039 8040 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 8041 struct kvm_mp_state *mp_state) 8042 { 8043 vcpu_load(vcpu); 8044 8045 kvm_apic_accept_events(vcpu); 8046 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED && 8047 vcpu->arch.pv.pv_unhalted) 8048 mp_state->mp_state = KVM_MP_STATE_RUNNABLE; 8049 else 8050 mp_state->mp_state = vcpu->arch.mp_state; 8051 8052 vcpu_put(vcpu); 8053 return 0; 8054 } 8055 8056 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 8057 struct kvm_mp_state *mp_state) 8058 { 8059 int ret = -EINVAL; 8060 8061 vcpu_load(vcpu); 8062 8063 if (!lapic_in_kernel(vcpu) && 8064 mp_state->mp_state != KVM_MP_STATE_RUNNABLE) 8065 goto out; 8066 8067 /* INITs are latched while in SMM */ 8068 if ((is_smm(vcpu) || vcpu->arch.smi_pending) && 8069 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED || 8070 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED)) 8071 goto out; 8072 8073 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) { 8074 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; 8075 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events); 8076 } else 8077 vcpu->arch.mp_state = mp_state->mp_state; 8078 kvm_make_request(KVM_REQ_EVENT, vcpu); 8079 8080 ret = 0; 8081 out: 8082 vcpu_put(vcpu); 8083 return ret; 8084 } 8085 8086 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, 8087 int reason, bool has_error_code, u32 error_code) 8088 { 8089 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 8090 int ret; 8091 8092 init_emulate_ctxt(vcpu); 8093 8094 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason, 8095 has_error_code, error_code); 8096 8097 if (ret) 8098 return EMULATE_FAIL; 8099 8100 kvm_rip_write(vcpu, ctxt->eip); 8101 kvm_set_rflags(vcpu, ctxt->eflags); 8102 kvm_make_request(KVM_REQ_EVENT, vcpu); 8103 return EMULATE_DONE; 8104 } 8105 EXPORT_SYMBOL_GPL(kvm_task_switch); 8106 8107 static int kvm_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 8108 { 8109 if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && 8110 (sregs->cr4 & X86_CR4_OSXSAVE)) 8111 return -EINVAL; 8112 8113 if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) { 8114 /* 8115 * When EFER.LME and CR0.PG are set, the processor is in 8116 * 64-bit mode (though maybe in a 32-bit code segment). 8117 * CR4.PAE and EFER.LMA must be set. 8118 */ 8119 if (!(sregs->cr4 & X86_CR4_PAE) 8120 || !(sregs->efer & EFER_LMA)) 8121 return -EINVAL; 8122 } else { 8123 /* 8124 * Not in 64-bit mode: EFER.LMA is clear and the code 8125 * segment cannot be 64-bit. 8126 */ 8127 if (sregs->efer & EFER_LMA || sregs->cs.l) 8128 return -EINVAL; 8129 } 8130 8131 return 0; 8132 } 8133 8134 static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) 8135 { 8136 struct msr_data apic_base_msr; 8137 int mmu_reset_needed = 0; 8138 int cpuid_update_needed = 0; 8139 int pending_vec, max_bits, idx; 8140 struct desc_ptr dt; 8141 int ret = -EINVAL; 8142 8143 if (kvm_valid_sregs(vcpu, sregs)) 8144 goto out; 8145 8146 apic_base_msr.data = sregs->apic_base; 8147 apic_base_msr.host_initiated = true; 8148 if (kvm_set_apic_base(vcpu, &apic_base_msr)) 8149 goto out; 8150 8151 dt.size = sregs->idt.limit; 8152 dt.address = sregs->idt.base; 8153 kvm_x86_ops->set_idt(vcpu, &dt); 8154 dt.size = sregs->gdt.limit; 8155 dt.address = sregs->gdt.base; 8156 kvm_x86_ops->set_gdt(vcpu, &dt); 8157 8158 vcpu->arch.cr2 = sregs->cr2; 8159 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3; 8160 vcpu->arch.cr3 = sregs->cr3; 8161 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 8162 8163 kvm_set_cr8(vcpu, sregs->cr8); 8164 8165 mmu_reset_needed |= vcpu->arch.efer != sregs->efer; 8166 kvm_x86_ops->set_efer(vcpu, sregs->efer); 8167 8168 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; 8169 kvm_x86_ops->set_cr0(vcpu, sregs->cr0); 8170 vcpu->arch.cr0 = sregs->cr0; 8171 8172 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; 8173 cpuid_update_needed |= ((kvm_read_cr4(vcpu) ^ sregs->cr4) & 8174 (X86_CR4_OSXSAVE | X86_CR4_PKE)); 8175 kvm_x86_ops->set_cr4(vcpu, sregs->cr4); 8176 if (cpuid_update_needed) 8177 kvm_update_cpuid(vcpu); 8178 8179 idx = srcu_read_lock(&vcpu->kvm->srcu); 8180 if (!is_long_mode(vcpu) && is_pae(vcpu)) { 8181 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); 8182 mmu_reset_needed = 1; 8183 } 8184 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8185 8186 if (mmu_reset_needed) 8187 kvm_mmu_reset_context(vcpu); 8188 8189 max_bits = KVM_NR_INTERRUPTS; 8190 pending_vec = find_first_bit( 8191 (const unsigned long *)sregs->interrupt_bitmap, max_bits); 8192 if (pending_vec < max_bits) { 8193 kvm_queue_interrupt(vcpu, pending_vec, false); 8194 pr_debug("Set back pending irq %d\n", pending_vec); 8195 } 8196 8197 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 8198 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 8199 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); 8200 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 8201 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 8202 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 8203 8204 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 8205 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 8206 8207 update_cr8_intercept(vcpu); 8208 8209 /* Older userspace won't unhalt the vcpu on reset. */ 8210 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && 8211 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && 8212 !is_protmode(vcpu)) 8213 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 8214 8215 kvm_make_request(KVM_REQ_EVENT, vcpu); 8216 8217 ret = 0; 8218 out: 8219 return ret; 8220 } 8221 8222 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 8223 struct kvm_sregs *sregs) 8224 { 8225 int ret; 8226 8227 vcpu_load(vcpu); 8228 ret = __set_sregs(vcpu, sregs); 8229 vcpu_put(vcpu); 8230 return ret; 8231 } 8232 8233 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 8234 struct kvm_guest_debug *dbg) 8235 { 8236 unsigned long rflags; 8237 int i, r; 8238 8239 vcpu_load(vcpu); 8240 8241 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { 8242 r = -EBUSY; 8243 if (vcpu->arch.exception.pending) 8244 goto out; 8245 if (dbg->control & KVM_GUESTDBG_INJECT_DB) 8246 kvm_queue_exception(vcpu, DB_VECTOR); 8247 else 8248 kvm_queue_exception(vcpu, BP_VECTOR); 8249 } 8250 8251 /* 8252 * Read rflags as long as potentially injected trace flags are still 8253 * filtered out. 8254 */ 8255 rflags = kvm_get_rflags(vcpu); 8256 8257 vcpu->guest_debug = dbg->control; 8258 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) 8259 vcpu->guest_debug = 0; 8260 8261 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { 8262 for (i = 0; i < KVM_NR_DB_REGS; ++i) 8263 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; 8264 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; 8265 } else { 8266 for (i = 0; i < KVM_NR_DB_REGS; i++) 8267 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 8268 } 8269 kvm_update_dr7(vcpu); 8270 8271 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 8272 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + 8273 get_segment_base(vcpu, VCPU_SREG_CS); 8274 8275 /* 8276 * Trigger an rflags update that will inject or remove the trace 8277 * flags. 8278 */ 8279 kvm_set_rflags(vcpu, rflags); 8280 8281 kvm_x86_ops->update_bp_intercept(vcpu); 8282 8283 r = 0; 8284 8285 out: 8286 vcpu_put(vcpu); 8287 return r; 8288 } 8289 8290 /* 8291 * Translate a guest virtual address to a guest physical address. 8292 */ 8293 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 8294 struct kvm_translation *tr) 8295 { 8296 unsigned long vaddr = tr->linear_address; 8297 gpa_t gpa; 8298 int idx; 8299 8300 vcpu_load(vcpu); 8301 8302 idx = srcu_read_lock(&vcpu->kvm->srcu); 8303 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); 8304 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8305 tr->physical_address = gpa; 8306 tr->valid = gpa != UNMAPPED_GVA; 8307 tr->writeable = 1; 8308 tr->usermode = 0; 8309 8310 vcpu_put(vcpu); 8311 return 0; 8312 } 8313 8314 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 8315 { 8316 struct fxregs_state *fxsave; 8317 8318 vcpu_load(vcpu); 8319 8320 fxsave = &vcpu->arch.guest_fpu.state.fxsave; 8321 memcpy(fpu->fpr, fxsave->st_space, 128); 8322 fpu->fcw = fxsave->cwd; 8323 fpu->fsw = fxsave->swd; 8324 fpu->ftwx = fxsave->twd; 8325 fpu->last_opcode = fxsave->fop; 8326 fpu->last_ip = fxsave->rip; 8327 fpu->last_dp = fxsave->rdp; 8328 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); 8329 8330 vcpu_put(vcpu); 8331 return 0; 8332 } 8333 8334 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 8335 { 8336 struct fxregs_state *fxsave; 8337 8338 vcpu_load(vcpu); 8339 8340 fxsave = &vcpu->arch.guest_fpu.state.fxsave; 8341 8342 memcpy(fxsave->st_space, fpu->fpr, 128); 8343 fxsave->cwd = fpu->fcw; 8344 fxsave->swd = fpu->fsw; 8345 fxsave->twd = fpu->ftwx; 8346 fxsave->fop = fpu->last_opcode; 8347 fxsave->rip = fpu->last_ip; 8348 fxsave->rdp = fpu->last_dp; 8349 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); 8350 8351 vcpu_put(vcpu); 8352 return 0; 8353 } 8354 8355 static void store_regs(struct kvm_vcpu *vcpu) 8356 { 8357 BUILD_BUG_ON(sizeof(struct kvm_sync_regs) > SYNC_REGS_SIZE_BYTES); 8358 8359 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_REGS) 8360 __get_regs(vcpu, &vcpu->run->s.regs.regs); 8361 8362 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_SREGS) 8363 __get_sregs(vcpu, &vcpu->run->s.regs.sregs); 8364 8365 if (vcpu->run->kvm_valid_regs & KVM_SYNC_X86_EVENTS) 8366 kvm_vcpu_ioctl_x86_get_vcpu_events( 8367 vcpu, &vcpu->run->s.regs.events); 8368 } 8369 8370 static int sync_regs(struct kvm_vcpu *vcpu) 8371 { 8372 if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS) 8373 return -EINVAL; 8374 8375 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) { 8376 __set_regs(vcpu, &vcpu->run->s.regs.regs); 8377 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS; 8378 } 8379 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_SREGS) { 8380 if (__set_sregs(vcpu, &vcpu->run->s.regs.sregs)) 8381 return -EINVAL; 8382 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_SREGS; 8383 } 8384 if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_EVENTS) { 8385 if (kvm_vcpu_ioctl_x86_set_vcpu_events( 8386 vcpu, &vcpu->run->s.regs.events)) 8387 return -EINVAL; 8388 vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_EVENTS; 8389 } 8390 8391 return 0; 8392 } 8393 8394 static void fx_init(struct kvm_vcpu *vcpu) 8395 { 8396 fpstate_init(&vcpu->arch.guest_fpu.state); 8397 if (boot_cpu_has(X86_FEATURE_XSAVES)) 8398 vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv = 8399 host_xcr0 | XSTATE_COMPACTION_ENABLED; 8400 8401 /* 8402 * Ensure guest xcr0 is valid for loading 8403 */ 8404 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 8405 8406 vcpu->arch.cr0 |= X86_CR0_ET; 8407 } 8408 8409 /* Swap (qemu) user FPU context for the guest FPU context. */ 8410 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) 8411 { 8412 preempt_disable(); 8413 copy_fpregs_to_fpstate(&vcpu->arch.user_fpu); 8414 /* PKRU is separately restored in kvm_x86_ops->run. */ 8415 __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu.state, 8416 ~XFEATURE_MASK_PKRU); 8417 preempt_enable(); 8418 trace_kvm_fpu(1); 8419 } 8420 8421 /* When vcpu_run ends, restore user space FPU context. */ 8422 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) 8423 { 8424 preempt_disable(); 8425 copy_fpregs_to_fpstate(&vcpu->arch.guest_fpu); 8426 copy_kernel_to_fpregs(&vcpu->arch.user_fpu.state); 8427 preempt_enable(); 8428 ++vcpu->stat.fpu_reload; 8429 trace_kvm_fpu(0); 8430 } 8431 8432 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 8433 { 8434 void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask; 8435 8436 kvmclock_reset(vcpu); 8437 8438 kvm_x86_ops->vcpu_free(vcpu); 8439 free_cpumask_var(wbinvd_dirty_mask); 8440 } 8441 8442 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 8443 unsigned int id) 8444 { 8445 struct kvm_vcpu *vcpu; 8446 8447 if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) 8448 printk_once(KERN_WARNING 8449 "kvm: SMP vm created on host with unstable TSC; " 8450 "guest TSC will not be reliable\n"); 8451 8452 vcpu = kvm_x86_ops->vcpu_create(kvm, id); 8453 8454 return vcpu; 8455 } 8456 8457 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 8458 { 8459 kvm_vcpu_mtrr_init(vcpu); 8460 vcpu_load(vcpu); 8461 kvm_vcpu_reset(vcpu, false); 8462 kvm_mmu_setup(vcpu); 8463 vcpu_put(vcpu); 8464 return 0; 8465 } 8466 8467 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 8468 { 8469 struct msr_data msr; 8470 struct kvm *kvm = vcpu->kvm; 8471 8472 kvm_hv_vcpu_postcreate(vcpu); 8473 8474 if (mutex_lock_killable(&vcpu->mutex)) 8475 return; 8476 vcpu_load(vcpu); 8477 msr.data = 0x0; 8478 msr.index = MSR_IA32_TSC; 8479 msr.host_initiated = true; 8480 kvm_write_tsc(vcpu, &msr); 8481 vcpu_put(vcpu); 8482 mutex_unlock(&vcpu->mutex); 8483 8484 if (!kvmclock_periodic_sync) 8485 return; 8486 8487 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 8488 KVMCLOCK_SYNC_PERIOD); 8489 } 8490 8491 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 8492 { 8493 vcpu->arch.apf.msr_val = 0; 8494 8495 vcpu_load(vcpu); 8496 kvm_mmu_unload(vcpu); 8497 vcpu_put(vcpu); 8498 8499 kvm_x86_ops->vcpu_free(vcpu); 8500 } 8501 8502 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) 8503 { 8504 kvm_lapic_reset(vcpu, init_event); 8505 8506 vcpu->arch.hflags = 0; 8507 8508 vcpu->arch.smi_pending = 0; 8509 vcpu->arch.smi_count = 0; 8510 atomic_set(&vcpu->arch.nmi_queued, 0); 8511 vcpu->arch.nmi_pending = 0; 8512 vcpu->arch.nmi_injected = false; 8513 kvm_clear_interrupt_queue(vcpu); 8514 kvm_clear_exception_queue(vcpu); 8515 vcpu->arch.exception.pending = false; 8516 8517 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); 8518 kvm_update_dr0123(vcpu); 8519 vcpu->arch.dr6 = DR6_INIT; 8520 kvm_update_dr6(vcpu); 8521 vcpu->arch.dr7 = DR7_FIXED_1; 8522 kvm_update_dr7(vcpu); 8523 8524 vcpu->arch.cr2 = 0; 8525 8526 kvm_make_request(KVM_REQ_EVENT, vcpu); 8527 vcpu->arch.apf.msr_val = 0; 8528 vcpu->arch.st.msr_val = 0; 8529 8530 kvmclock_reset(vcpu); 8531 8532 kvm_clear_async_pf_completion_queue(vcpu); 8533 kvm_async_pf_hash_reset(vcpu); 8534 vcpu->arch.apf.halted = false; 8535 8536 if (kvm_mpx_supported()) { 8537 void *mpx_state_buffer; 8538 8539 /* 8540 * To avoid have the INIT path from kvm_apic_has_events() that be 8541 * called with loaded FPU and does not let userspace fix the state. 8542 */ 8543 if (init_event) 8544 kvm_put_guest_fpu(vcpu); 8545 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave, 8546 XFEATURE_MASK_BNDREGS); 8547 if (mpx_state_buffer) 8548 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state)); 8549 mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave, 8550 XFEATURE_MASK_BNDCSR); 8551 if (mpx_state_buffer) 8552 memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr)); 8553 if (init_event) 8554 kvm_load_guest_fpu(vcpu); 8555 } 8556 8557 if (!init_event) { 8558 kvm_pmu_reset(vcpu); 8559 vcpu->arch.smbase = 0x30000; 8560 8561 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT; 8562 vcpu->arch.msr_misc_features_enables = 0; 8563 8564 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 8565 } 8566 8567 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); 8568 vcpu->arch.regs_avail = ~0; 8569 vcpu->arch.regs_dirty = ~0; 8570 8571 vcpu->arch.ia32_xss = 0; 8572 8573 kvm_x86_ops->vcpu_reset(vcpu, init_event); 8574 } 8575 8576 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) 8577 { 8578 struct kvm_segment cs; 8579 8580 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 8581 cs.selector = vector << 8; 8582 cs.base = vector << 12; 8583 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 8584 kvm_rip_write(vcpu, 0); 8585 } 8586 8587 int kvm_arch_hardware_enable(void) 8588 { 8589 struct kvm *kvm; 8590 struct kvm_vcpu *vcpu; 8591 int i; 8592 int ret; 8593 u64 local_tsc; 8594 u64 max_tsc = 0; 8595 bool stable, backwards_tsc = false; 8596 8597 kvm_shared_msr_cpu_online(); 8598 ret = kvm_x86_ops->hardware_enable(); 8599 if (ret != 0) 8600 return ret; 8601 8602 local_tsc = rdtsc(); 8603 stable = !kvm_check_tsc_unstable(); 8604 list_for_each_entry(kvm, &vm_list, vm_list) { 8605 kvm_for_each_vcpu(i, vcpu, kvm) { 8606 if (!stable && vcpu->cpu == smp_processor_id()) 8607 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 8608 if (stable && vcpu->arch.last_host_tsc > local_tsc) { 8609 backwards_tsc = true; 8610 if (vcpu->arch.last_host_tsc > max_tsc) 8611 max_tsc = vcpu->arch.last_host_tsc; 8612 } 8613 } 8614 } 8615 8616 /* 8617 * Sometimes, even reliable TSCs go backwards. This happens on 8618 * platforms that reset TSC during suspend or hibernate actions, but 8619 * maintain synchronization. We must compensate. Fortunately, we can 8620 * detect that condition here, which happens early in CPU bringup, 8621 * before any KVM threads can be running. Unfortunately, we can't 8622 * bring the TSCs fully up to date with real time, as we aren't yet far 8623 * enough into CPU bringup that we know how much real time has actually 8624 * elapsed; our helper function, ktime_get_boot_ns() will be using boot 8625 * variables that haven't been updated yet. 8626 * 8627 * So we simply find the maximum observed TSC above, then record the 8628 * adjustment to TSC in each VCPU. When the VCPU later gets loaded, 8629 * the adjustment will be applied. Note that we accumulate 8630 * adjustments, in case multiple suspend cycles happen before some VCPU 8631 * gets a chance to run again. In the event that no KVM threads get a 8632 * chance to run, we will miss the entire elapsed period, as we'll have 8633 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may 8634 * loose cycle time. This isn't too big a deal, since the loss will be 8635 * uniform across all VCPUs (not to mention the scenario is extremely 8636 * unlikely). It is possible that a second hibernate recovery happens 8637 * much faster than a first, causing the observed TSC here to be 8638 * smaller; this would require additional padding adjustment, which is 8639 * why we set last_host_tsc to the local tsc observed here. 8640 * 8641 * N.B. - this code below runs only on platforms with reliable TSC, 8642 * as that is the only way backwards_tsc is set above. Also note 8643 * that this runs for ALL vcpus, which is not a bug; all VCPUs should 8644 * have the same delta_cyc adjustment applied if backwards_tsc 8645 * is detected. Note further, this adjustment is only done once, 8646 * as we reset last_host_tsc on all VCPUs to stop this from being 8647 * called multiple times (one for each physical CPU bringup). 8648 * 8649 * Platforms with unreliable TSCs don't have to deal with this, they 8650 * will be compensated by the logic in vcpu_load, which sets the TSC to 8651 * catchup mode. This will catchup all VCPUs to real time, but cannot 8652 * guarantee that they stay in perfect synchronization. 8653 */ 8654 if (backwards_tsc) { 8655 u64 delta_cyc = max_tsc - local_tsc; 8656 list_for_each_entry(kvm, &vm_list, vm_list) { 8657 kvm->arch.backwards_tsc_observed = true; 8658 kvm_for_each_vcpu(i, vcpu, kvm) { 8659 vcpu->arch.tsc_offset_adjustment += delta_cyc; 8660 vcpu->arch.last_host_tsc = local_tsc; 8661 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 8662 } 8663 8664 /* 8665 * We have to disable TSC offset matching.. if you were 8666 * booting a VM while issuing an S4 host suspend.... 8667 * you may have some problem. Solving this issue is 8668 * left as an exercise to the reader. 8669 */ 8670 kvm->arch.last_tsc_nsec = 0; 8671 kvm->arch.last_tsc_write = 0; 8672 } 8673 8674 } 8675 return 0; 8676 } 8677 8678 void kvm_arch_hardware_disable(void) 8679 { 8680 kvm_x86_ops->hardware_disable(); 8681 drop_user_return_notifiers(); 8682 } 8683 8684 int kvm_arch_hardware_setup(void) 8685 { 8686 int r; 8687 8688 r = kvm_x86_ops->hardware_setup(); 8689 if (r != 0) 8690 return r; 8691 8692 if (kvm_has_tsc_control) { 8693 /* 8694 * Make sure the user can only configure tsc_khz values that 8695 * fit into a signed integer. 8696 * A min value is not calculated because it will always 8697 * be 1 on all machines. 8698 */ 8699 u64 max = min(0x7fffffffULL, 8700 __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz)); 8701 kvm_max_guest_tsc_khz = max; 8702 8703 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits; 8704 } 8705 8706 kvm_init_msr_list(); 8707 return 0; 8708 } 8709 8710 void kvm_arch_hardware_unsetup(void) 8711 { 8712 kvm_x86_ops->hardware_unsetup(); 8713 } 8714 8715 void kvm_arch_check_processor_compat(void *rtn) 8716 { 8717 kvm_x86_ops->check_processor_compatibility(rtn); 8718 } 8719 8720 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) 8721 { 8722 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; 8723 } 8724 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); 8725 8726 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) 8727 { 8728 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0; 8729 } 8730 8731 struct static_key kvm_no_apic_vcpu __read_mostly; 8732 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu); 8733 8734 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 8735 { 8736 struct page *page; 8737 int r; 8738 8739 vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu); 8740 vcpu->arch.emulate_ctxt.ops = &emulate_ops; 8741 if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu)) 8742 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 8743 else 8744 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; 8745 8746 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 8747 if (!page) { 8748 r = -ENOMEM; 8749 goto fail; 8750 } 8751 vcpu->arch.pio_data = page_address(page); 8752 8753 kvm_set_tsc_khz(vcpu, max_tsc_khz); 8754 8755 r = kvm_mmu_create(vcpu); 8756 if (r < 0) 8757 goto fail_free_pio_data; 8758 8759 if (irqchip_in_kernel(vcpu->kvm)) { 8760 r = kvm_create_lapic(vcpu); 8761 if (r < 0) 8762 goto fail_mmu_destroy; 8763 } else 8764 static_key_slow_inc(&kvm_no_apic_vcpu); 8765 8766 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, 8767 GFP_KERNEL); 8768 if (!vcpu->arch.mce_banks) { 8769 r = -ENOMEM; 8770 goto fail_free_lapic; 8771 } 8772 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; 8773 8774 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) { 8775 r = -ENOMEM; 8776 goto fail_free_mce_banks; 8777 } 8778 8779 fx_init(vcpu); 8780 8781 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; 8782 8783 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); 8784 8785 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT; 8786 8787 kvm_async_pf_hash_reset(vcpu); 8788 kvm_pmu_init(vcpu); 8789 8790 vcpu->arch.pending_external_vector = -1; 8791 vcpu->arch.preempted_in_kernel = false; 8792 8793 kvm_hv_vcpu_init(vcpu); 8794 8795 return 0; 8796 8797 fail_free_mce_banks: 8798 kfree(vcpu->arch.mce_banks); 8799 fail_free_lapic: 8800 kvm_free_lapic(vcpu); 8801 fail_mmu_destroy: 8802 kvm_mmu_destroy(vcpu); 8803 fail_free_pio_data: 8804 free_page((unsigned long)vcpu->arch.pio_data); 8805 fail: 8806 return r; 8807 } 8808 8809 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 8810 { 8811 int idx; 8812 8813 kvm_hv_vcpu_uninit(vcpu); 8814 kvm_pmu_destroy(vcpu); 8815 kfree(vcpu->arch.mce_banks); 8816 kvm_free_lapic(vcpu); 8817 idx = srcu_read_lock(&vcpu->kvm->srcu); 8818 kvm_mmu_destroy(vcpu); 8819 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8820 free_page((unsigned long)vcpu->arch.pio_data); 8821 if (!lapic_in_kernel(vcpu)) 8822 static_key_slow_dec(&kvm_no_apic_vcpu); 8823 } 8824 8825 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) 8826 { 8827 vcpu->arch.l1tf_flush_l1d = true; 8828 kvm_x86_ops->sched_in(vcpu, cpu); 8829 } 8830 8831 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 8832 { 8833 if (type) 8834 return -EINVAL; 8835 8836 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list); 8837 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); 8838 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); 8839 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); 8840 atomic_set(&kvm->arch.noncoherent_dma_count, 0); 8841 8842 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ 8843 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); 8844 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ 8845 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, 8846 &kvm->arch.irq_sources_bitmap); 8847 8848 raw_spin_lock_init(&kvm->arch.tsc_write_lock); 8849 mutex_init(&kvm->arch.apic_map_lock); 8850 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock); 8851 8852 kvm->arch.kvmclock_offset = -ktime_get_boot_ns(); 8853 pvclock_update_vm_gtod_copy(kvm); 8854 8855 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn); 8856 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn); 8857 8858 kvm_hv_init_vm(kvm); 8859 kvm_page_track_init(kvm); 8860 kvm_mmu_init_vm(kvm); 8861 8862 if (kvm_x86_ops->vm_init) 8863 return kvm_x86_ops->vm_init(kvm); 8864 8865 return 0; 8866 } 8867 8868 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) 8869 { 8870 vcpu_load(vcpu); 8871 kvm_mmu_unload(vcpu); 8872 vcpu_put(vcpu); 8873 } 8874 8875 static void kvm_free_vcpus(struct kvm *kvm) 8876 { 8877 unsigned int i; 8878 struct kvm_vcpu *vcpu; 8879 8880 /* 8881 * Unpin any mmu pages first. 8882 */ 8883 kvm_for_each_vcpu(i, vcpu, kvm) { 8884 kvm_clear_async_pf_completion_queue(vcpu); 8885 kvm_unload_vcpu_mmu(vcpu); 8886 } 8887 kvm_for_each_vcpu(i, vcpu, kvm) 8888 kvm_arch_vcpu_free(vcpu); 8889 8890 mutex_lock(&kvm->lock); 8891 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 8892 kvm->vcpus[i] = NULL; 8893 8894 atomic_set(&kvm->online_vcpus, 0); 8895 mutex_unlock(&kvm->lock); 8896 } 8897 8898 void kvm_arch_sync_events(struct kvm *kvm) 8899 { 8900 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work); 8901 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work); 8902 kvm_free_pit(kvm); 8903 } 8904 8905 int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 8906 { 8907 int i, r; 8908 unsigned long hva; 8909 struct kvm_memslots *slots = kvm_memslots(kvm); 8910 struct kvm_memory_slot *slot, old; 8911 8912 /* Called with kvm->slots_lock held. */ 8913 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM)) 8914 return -EINVAL; 8915 8916 slot = id_to_memslot(slots, id); 8917 if (size) { 8918 if (slot->npages) 8919 return -EEXIST; 8920 8921 /* 8922 * MAP_SHARED to prevent internal slot pages from being moved 8923 * by fork()/COW. 8924 */ 8925 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE, 8926 MAP_SHARED | MAP_ANONYMOUS, 0); 8927 if (IS_ERR((void *)hva)) 8928 return PTR_ERR((void *)hva); 8929 } else { 8930 if (!slot->npages) 8931 return 0; 8932 8933 hva = 0; 8934 } 8935 8936 old = *slot; 8937 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 8938 struct kvm_userspace_memory_region m; 8939 8940 m.slot = id | (i << 16); 8941 m.flags = 0; 8942 m.guest_phys_addr = gpa; 8943 m.userspace_addr = hva; 8944 m.memory_size = size; 8945 r = __kvm_set_memory_region(kvm, &m); 8946 if (r < 0) 8947 return r; 8948 } 8949 8950 if (!size) 8951 vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE); 8952 8953 return 0; 8954 } 8955 EXPORT_SYMBOL_GPL(__x86_set_memory_region); 8956 8957 int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 8958 { 8959 int r; 8960 8961 mutex_lock(&kvm->slots_lock); 8962 r = __x86_set_memory_region(kvm, id, gpa, size); 8963 mutex_unlock(&kvm->slots_lock); 8964 8965 return r; 8966 } 8967 EXPORT_SYMBOL_GPL(x86_set_memory_region); 8968 8969 void kvm_arch_destroy_vm(struct kvm *kvm) 8970 { 8971 if (current->mm == kvm->mm) { 8972 /* 8973 * Free memory regions allocated on behalf of userspace, 8974 * unless the the memory map has changed due to process exit 8975 * or fd copying. 8976 */ 8977 x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0); 8978 x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0); 8979 x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0); 8980 } 8981 if (kvm_x86_ops->vm_destroy) 8982 kvm_x86_ops->vm_destroy(kvm); 8983 kvm_pic_destroy(kvm); 8984 kvm_ioapic_destroy(kvm); 8985 kvm_free_vcpus(kvm); 8986 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); 8987 kvm_mmu_uninit_vm(kvm); 8988 kvm_page_track_cleanup(kvm); 8989 kvm_hv_destroy_vm(kvm); 8990 } 8991 8992 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, 8993 struct kvm_memory_slot *dont) 8994 { 8995 int i; 8996 8997 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 8998 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { 8999 kvfree(free->arch.rmap[i]); 9000 free->arch.rmap[i] = NULL; 9001 } 9002 if (i == 0) 9003 continue; 9004 9005 if (!dont || free->arch.lpage_info[i - 1] != 9006 dont->arch.lpage_info[i - 1]) { 9007 kvfree(free->arch.lpage_info[i - 1]); 9008 free->arch.lpage_info[i - 1] = NULL; 9009 } 9010 } 9011 9012 kvm_page_track_free_memslot(free, dont); 9013 } 9014 9015 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 9016 unsigned long npages) 9017 { 9018 int i; 9019 9020 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 9021 struct kvm_lpage_info *linfo; 9022 unsigned long ugfn; 9023 int lpages; 9024 int level = i + 1; 9025 9026 lpages = gfn_to_index(slot->base_gfn + npages - 1, 9027 slot->base_gfn, level) + 1; 9028 9029 slot->arch.rmap[i] = 9030 kvcalloc(lpages, sizeof(*slot->arch.rmap[i]), 9031 GFP_KERNEL); 9032 if (!slot->arch.rmap[i]) 9033 goto out_free; 9034 if (i == 0) 9035 continue; 9036 9037 linfo = kvcalloc(lpages, sizeof(*linfo), GFP_KERNEL); 9038 if (!linfo) 9039 goto out_free; 9040 9041 slot->arch.lpage_info[i - 1] = linfo; 9042 9043 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) 9044 linfo[0].disallow_lpage = 1; 9045 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) 9046 linfo[lpages - 1].disallow_lpage = 1; 9047 ugfn = slot->userspace_addr >> PAGE_SHIFT; 9048 /* 9049 * If the gfn and userspace address are not aligned wrt each 9050 * other, or if explicitly asked to, disable large page 9051 * support for this slot 9052 */ 9053 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || 9054 !kvm_largepages_enabled()) { 9055 unsigned long j; 9056 9057 for (j = 0; j < lpages; ++j) 9058 linfo[j].disallow_lpage = 1; 9059 } 9060 } 9061 9062 if (kvm_page_track_create_memslot(slot, npages)) 9063 goto out_free; 9064 9065 return 0; 9066 9067 out_free: 9068 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 9069 kvfree(slot->arch.rmap[i]); 9070 slot->arch.rmap[i] = NULL; 9071 if (i == 0) 9072 continue; 9073 9074 kvfree(slot->arch.lpage_info[i - 1]); 9075 slot->arch.lpage_info[i - 1] = NULL; 9076 } 9077 return -ENOMEM; 9078 } 9079 9080 void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots) 9081 { 9082 /* 9083 * memslots->generation has been incremented. 9084 * mmio generation may have reached its maximum value. 9085 */ 9086 kvm_mmu_invalidate_mmio_sptes(kvm, slots); 9087 } 9088 9089 int kvm_arch_prepare_memory_region(struct kvm *kvm, 9090 struct kvm_memory_slot *memslot, 9091 const struct kvm_userspace_memory_region *mem, 9092 enum kvm_mr_change change) 9093 { 9094 return 0; 9095 } 9096 9097 static void kvm_mmu_slot_apply_flags(struct kvm *kvm, 9098 struct kvm_memory_slot *new) 9099 { 9100 /* Still write protect RO slot */ 9101 if (new->flags & KVM_MEM_READONLY) { 9102 kvm_mmu_slot_remove_write_access(kvm, new); 9103 return; 9104 } 9105 9106 /* 9107 * Call kvm_x86_ops dirty logging hooks when they are valid. 9108 * 9109 * kvm_x86_ops->slot_disable_log_dirty is called when: 9110 * 9111 * - KVM_MR_CREATE with dirty logging is disabled 9112 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag 9113 * 9114 * The reason is, in case of PML, we need to set D-bit for any slots 9115 * with dirty logging disabled in order to eliminate unnecessary GPA 9116 * logging in PML buffer (and potential PML buffer full VMEXT). This 9117 * guarantees leaving PML enabled during guest's lifetime won't have 9118 * any additonal overhead from PML when guest is running with dirty 9119 * logging disabled for memory slots. 9120 * 9121 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot 9122 * to dirty logging mode. 9123 * 9124 * If kvm_x86_ops dirty logging hooks are invalid, use write protect. 9125 * 9126 * In case of write protect: 9127 * 9128 * Write protect all pages for dirty logging. 9129 * 9130 * All the sptes including the large sptes which point to this 9131 * slot are set to readonly. We can not create any new large 9132 * spte on this slot until the end of the logging. 9133 * 9134 * See the comments in fast_page_fault(). 9135 */ 9136 if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) { 9137 if (kvm_x86_ops->slot_enable_log_dirty) 9138 kvm_x86_ops->slot_enable_log_dirty(kvm, new); 9139 else 9140 kvm_mmu_slot_remove_write_access(kvm, new); 9141 } else { 9142 if (kvm_x86_ops->slot_disable_log_dirty) 9143 kvm_x86_ops->slot_disable_log_dirty(kvm, new); 9144 } 9145 } 9146 9147 void kvm_arch_commit_memory_region(struct kvm *kvm, 9148 const struct kvm_userspace_memory_region *mem, 9149 const struct kvm_memory_slot *old, 9150 const struct kvm_memory_slot *new, 9151 enum kvm_mr_change change) 9152 { 9153 int nr_mmu_pages = 0; 9154 9155 if (!kvm->arch.n_requested_mmu_pages) 9156 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); 9157 9158 if (nr_mmu_pages) 9159 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); 9160 9161 /* 9162 * Dirty logging tracks sptes in 4k granularity, meaning that large 9163 * sptes have to be split. If live migration is successful, the guest 9164 * in the source machine will be destroyed and large sptes will be 9165 * created in the destination. However, if the guest continues to run 9166 * in the source machine (for example if live migration fails), small 9167 * sptes will remain around and cause bad performance. 9168 * 9169 * Scan sptes if dirty logging has been stopped, dropping those 9170 * which can be collapsed into a single large-page spte. Later 9171 * page faults will create the large-page sptes. 9172 */ 9173 if ((change != KVM_MR_DELETE) && 9174 (old->flags & KVM_MEM_LOG_DIRTY_PAGES) && 9175 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) 9176 kvm_mmu_zap_collapsible_sptes(kvm, new); 9177 9178 /* 9179 * Set up write protection and/or dirty logging for the new slot. 9180 * 9181 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have 9182 * been zapped so no dirty logging staff is needed for old slot. For 9183 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the 9184 * new and it's also covered when dealing with the new slot. 9185 * 9186 * FIXME: const-ify all uses of struct kvm_memory_slot. 9187 */ 9188 if (change != KVM_MR_DELETE) 9189 kvm_mmu_slot_apply_flags(kvm, (struct kvm_memory_slot *) new); 9190 } 9191 9192 void kvm_arch_flush_shadow_all(struct kvm *kvm) 9193 { 9194 kvm_mmu_invalidate_zap_all_pages(kvm); 9195 } 9196 9197 void kvm_arch_flush_shadow_memslot(struct kvm *kvm, 9198 struct kvm_memory_slot *slot) 9199 { 9200 kvm_page_track_flush_slot(kvm, slot); 9201 } 9202 9203 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) 9204 { 9205 if (!list_empty_careful(&vcpu->async_pf.done)) 9206 return true; 9207 9208 if (kvm_apic_has_events(vcpu)) 9209 return true; 9210 9211 if (vcpu->arch.pv.pv_unhalted) 9212 return true; 9213 9214 if (vcpu->arch.exception.pending) 9215 return true; 9216 9217 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 9218 (vcpu->arch.nmi_pending && 9219 kvm_x86_ops->nmi_allowed(vcpu))) 9220 return true; 9221 9222 if (kvm_test_request(KVM_REQ_SMI, vcpu) || 9223 (vcpu->arch.smi_pending && !is_smm(vcpu))) 9224 return true; 9225 9226 if (kvm_arch_interrupt_allowed(vcpu) && 9227 kvm_cpu_has_interrupt(vcpu)) 9228 return true; 9229 9230 if (kvm_hv_has_stimer_pending(vcpu)) 9231 return true; 9232 9233 return false; 9234 } 9235 9236 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 9237 { 9238 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu); 9239 } 9240 9241 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 9242 { 9243 return vcpu->arch.preempted_in_kernel; 9244 } 9245 9246 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 9247 { 9248 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 9249 } 9250 9251 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) 9252 { 9253 return kvm_x86_ops->interrupt_allowed(vcpu); 9254 } 9255 9256 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu) 9257 { 9258 if (is_64_bit_mode(vcpu)) 9259 return kvm_rip_read(vcpu); 9260 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) + 9261 kvm_rip_read(vcpu)); 9262 } 9263 EXPORT_SYMBOL_GPL(kvm_get_linear_rip); 9264 9265 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip) 9266 { 9267 return kvm_get_linear_rip(vcpu) == linear_rip; 9268 } 9269 EXPORT_SYMBOL_GPL(kvm_is_linear_rip); 9270 9271 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) 9272 { 9273 unsigned long rflags; 9274 9275 rflags = kvm_x86_ops->get_rflags(vcpu); 9276 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 9277 rflags &= ~X86_EFLAGS_TF; 9278 return rflags; 9279 } 9280 EXPORT_SYMBOL_GPL(kvm_get_rflags); 9281 9282 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 9283 { 9284 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && 9285 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip)) 9286 rflags |= X86_EFLAGS_TF; 9287 kvm_x86_ops->set_rflags(vcpu, rflags); 9288 } 9289 9290 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 9291 { 9292 __kvm_set_rflags(vcpu, rflags); 9293 kvm_make_request(KVM_REQ_EVENT, vcpu); 9294 } 9295 EXPORT_SYMBOL_GPL(kvm_set_rflags); 9296 9297 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work) 9298 { 9299 int r; 9300 9301 if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) || 9302 work->wakeup_all) 9303 return; 9304 9305 r = kvm_mmu_reload(vcpu); 9306 if (unlikely(r)) 9307 return; 9308 9309 if (!vcpu->arch.mmu.direct_map && 9310 work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu)) 9311 return; 9312 9313 vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true); 9314 } 9315 9316 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) 9317 { 9318 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); 9319 } 9320 9321 static inline u32 kvm_async_pf_next_probe(u32 key) 9322 { 9323 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1); 9324 } 9325 9326 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 9327 { 9328 u32 key = kvm_async_pf_hash_fn(gfn); 9329 9330 while (vcpu->arch.apf.gfns[key] != ~0) 9331 key = kvm_async_pf_next_probe(key); 9332 9333 vcpu->arch.apf.gfns[key] = gfn; 9334 } 9335 9336 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) 9337 { 9338 int i; 9339 u32 key = kvm_async_pf_hash_fn(gfn); 9340 9341 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) && 9342 (vcpu->arch.apf.gfns[key] != gfn && 9343 vcpu->arch.apf.gfns[key] != ~0); i++) 9344 key = kvm_async_pf_next_probe(key); 9345 9346 return key; 9347 } 9348 9349 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 9350 { 9351 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; 9352 } 9353 9354 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 9355 { 9356 u32 i, j, k; 9357 9358 i = j = kvm_async_pf_gfn_slot(vcpu, gfn); 9359 while (true) { 9360 vcpu->arch.apf.gfns[i] = ~0; 9361 do { 9362 j = kvm_async_pf_next_probe(j); 9363 if (vcpu->arch.apf.gfns[j] == ~0) 9364 return; 9365 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); 9366 /* 9367 * k lies cyclically in ]i,j] 9368 * | i.k.j | 9369 * |....j i.k.| or |.k..j i...| 9370 */ 9371 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); 9372 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; 9373 i = j; 9374 } 9375 } 9376 9377 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val) 9378 { 9379 9380 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val, 9381 sizeof(val)); 9382 } 9383 9384 static int apf_get_user(struct kvm_vcpu *vcpu, u32 *val) 9385 { 9386 9387 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, val, 9388 sizeof(u32)); 9389 } 9390 9391 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 9392 struct kvm_async_pf *work) 9393 { 9394 struct x86_exception fault; 9395 9396 trace_kvm_async_pf_not_present(work->arch.token, work->gva); 9397 kvm_add_async_pf_gfn(vcpu, work->arch.gfn); 9398 9399 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) || 9400 (vcpu->arch.apf.send_user_only && 9401 kvm_x86_ops->get_cpl(vcpu) == 0)) 9402 kvm_make_request(KVM_REQ_APF_HALT, vcpu); 9403 else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) { 9404 fault.vector = PF_VECTOR; 9405 fault.error_code_valid = true; 9406 fault.error_code = 0; 9407 fault.nested_page_fault = false; 9408 fault.address = work->arch.token; 9409 fault.async_page_fault = true; 9410 kvm_inject_page_fault(vcpu, &fault); 9411 } 9412 } 9413 9414 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 9415 struct kvm_async_pf *work) 9416 { 9417 struct x86_exception fault; 9418 u32 val; 9419 9420 if (work->wakeup_all) 9421 work->arch.token = ~0; /* broadcast wakeup */ 9422 else 9423 kvm_del_async_pf_gfn(vcpu, work->arch.gfn); 9424 trace_kvm_async_pf_ready(work->arch.token, work->gva); 9425 9426 if (vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED && 9427 !apf_get_user(vcpu, &val)) { 9428 if (val == KVM_PV_REASON_PAGE_NOT_PRESENT && 9429 vcpu->arch.exception.pending && 9430 vcpu->arch.exception.nr == PF_VECTOR && 9431 !apf_put_user(vcpu, 0)) { 9432 vcpu->arch.exception.injected = false; 9433 vcpu->arch.exception.pending = false; 9434 vcpu->arch.exception.nr = 0; 9435 vcpu->arch.exception.has_error_code = false; 9436 vcpu->arch.exception.error_code = 0; 9437 } else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) { 9438 fault.vector = PF_VECTOR; 9439 fault.error_code_valid = true; 9440 fault.error_code = 0; 9441 fault.nested_page_fault = false; 9442 fault.address = work->arch.token; 9443 fault.async_page_fault = true; 9444 kvm_inject_page_fault(vcpu, &fault); 9445 } 9446 } 9447 vcpu->arch.apf.halted = false; 9448 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 9449 } 9450 9451 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 9452 { 9453 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED)) 9454 return true; 9455 else 9456 return kvm_can_do_async_pf(vcpu); 9457 } 9458 9459 void kvm_arch_start_assignment(struct kvm *kvm) 9460 { 9461 atomic_inc(&kvm->arch.assigned_device_count); 9462 } 9463 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment); 9464 9465 void kvm_arch_end_assignment(struct kvm *kvm) 9466 { 9467 atomic_dec(&kvm->arch.assigned_device_count); 9468 } 9469 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment); 9470 9471 bool kvm_arch_has_assigned_device(struct kvm *kvm) 9472 { 9473 return atomic_read(&kvm->arch.assigned_device_count); 9474 } 9475 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); 9476 9477 void kvm_arch_register_noncoherent_dma(struct kvm *kvm) 9478 { 9479 atomic_inc(&kvm->arch.noncoherent_dma_count); 9480 } 9481 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma); 9482 9483 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm) 9484 { 9485 atomic_dec(&kvm->arch.noncoherent_dma_count); 9486 } 9487 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma); 9488 9489 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm) 9490 { 9491 return atomic_read(&kvm->arch.noncoherent_dma_count); 9492 } 9493 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma); 9494 9495 bool kvm_arch_has_irq_bypass(void) 9496 { 9497 return kvm_x86_ops->update_pi_irte != NULL; 9498 } 9499 9500 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, 9501 struct irq_bypass_producer *prod) 9502 { 9503 struct kvm_kernel_irqfd *irqfd = 9504 container_of(cons, struct kvm_kernel_irqfd, consumer); 9505 9506 irqfd->producer = prod; 9507 9508 return kvm_x86_ops->update_pi_irte(irqfd->kvm, 9509 prod->irq, irqfd->gsi, 1); 9510 } 9511 9512 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, 9513 struct irq_bypass_producer *prod) 9514 { 9515 int ret; 9516 struct kvm_kernel_irqfd *irqfd = 9517 container_of(cons, struct kvm_kernel_irqfd, consumer); 9518 9519 WARN_ON(irqfd->producer != prod); 9520 irqfd->producer = NULL; 9521 9522 /* 9523 * When producer of consumer is unregistered, we change back to 9524 * remapped mode, so we can re-use the current implementation 9525 * when the irq is masked/disabled or the consumer side (KVM 9526 * int this case doesn't want to receive the interrupts. 9527 */ 9528 ret = kvm_x86_ops->update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 0); 9529 if (ret) 9530 printk(KERN_INFO "irq bypass consumer (token %p) unregistration" 9531 " fails: %d\n", irqfd->consumer.token, ret); 9532 } 9533 9534 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq, 9535 uint32_t guest_irq, bool set) 9536 { 9537 if (!kvm_x86_ops->update_pi_irte) 9538 return -EINVAL; 9539 9540 return kvm_x86_ops->update_pi_irte(kvm, host_irq, guest_irq, set); 9541 } 9542 9543 bool kvm_vector_hashing_enabled(void) 9544 { 9545 return vector_hashing; 9546 } 9547 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled); 9548 9549 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); 9550 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio); 9551 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); 9552 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); 9553 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); 9554 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); 9555 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); 9556 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); 9557 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); 9558 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); 9559 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); 9560 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit); 9561 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts); 9562 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset); 9563 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window); 9564 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full); 9565 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update); 9566 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access); 9567 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi); 9568