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 58 #include <trace/events/kvm.h> 59 60 #include <asm/debugreg.h> 61 #include <asm/msr.h> 62 #include <asm/desc.h> 63 #include <asm/mce.h> 64 #include <linux/kernel_stat.h> 65 #include <asm/fpu/internal.h> /* Ugh! */ 66 #include <asm/pvclock.h> 67 #include <asm/div64.h> 68 #include <asm/irq_remapping.h> 69 70 #define CREATE_TRACE_POINTS 71 #include "trace.h" 72 73 #define MAX_IO_MSRS 256 74 #define KVM_MAX_MCE_BANKS 32 75 u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P; 76 EXPORT_SYMBOL_GPL(kvm_mce_cap_supported); 77 78 #define emul_to_vcpu(ctxt) \ 79 container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt) 80 81 /* EFER defaults: 82 * - enable syscall per default because its emulated by KVM 83 * - enable LME and LMA per default on 64 bit KVM 84 */ 85 #ifdef CONFIG_X86_64 86 static 87 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); 88 #else 89 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE); 90 #endif 91 92 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM 93 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 94 95 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \ 96 KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 97 98 static void update_cr8_intercept(struct kvm_vcpu *vcpu); 99 static void process_nmi(struct kvm_vcpu *vcpu); 100 static void enter_smm(struct kvm_vcpu *vcpu); 101 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); 102 103 struct kvm_x86_ops *kvm_x86_ops __read_mostly; 104 EXPORT_SYMBOL_GPL(kvm_x86_ops); 105 106 static bool __read_mostly ignore_msrs = 0; 107 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR); 108 109 unsigned int min_timer_period_us = 500; 110 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR); 111 112 static bool __read_mostly kvmclock_periodic_sync = true; 113 module_param(kvmclock_periodic_sync, bool, S_IRUGO); 114 115 bool __read_mostly kvm_has_tsc_control; 116 EXPORT_SYMBOL_GPL(kvm_has_tsc_control); 117 u32 __read_mostly kvm_max_guest_tsc_khz; 118 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); 119 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits; 120 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits); 121 u64 __read_mostly kvm_max_tsc_scaling_ratio; 122 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio); 123 u64 __read_mostly kvm_default_tsc_scaling_ratio; 124 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio); 125 126 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */ 127 static u32 __read_mostly tsc_tolerance_ppm = 250; 128 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR); 129 130 /* lapic timer advance (tscdeadline mode only) in nanoseconds */ 131 unsigned int __read_mostly lapic_timer_advance_ns = 0; 132 module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR); 133 134 static bool __read_mostly vector_hashing = true; 135 module_param(vector_hashing, bool, S_IRUGO); 136 137 #define KVM_NR_SHARED_MSRS 16 138 139 struct kvm_shared_msrs_global { 140 int nr; 141 u32 msrs[KVM_NR_SHARED_MSRS]; 142 }; 143 144 struct kvm_shared_msrs { 145 struct user_return_notifier urn; 146 bool registered; 147 struct kvm_shared_msr_values { 148 u64 host; 149 u64 curr; 150 } values[KVM_NR_SHARED_MSRS]; 151 }; 152 153 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; 154 static struct kvm_shared_msrs __percpu *shared_msrs; 155 156 struct kvm_stats_debugfs_item debugfs_entries[] = { 157 { "pf_fixed", VCPU_STAT(pf_fixed) }, 158 { "pf_guest", VCPU_STAT(pf_guest) }, 159 { "tlb_flush", VCPU_STAT(tlb_flush) }, 160 { "invlpg", VCPU_STAT(invlpg) }, 161 { "exits", VCPU_STAT(exits) }, 162 { "io_exits", VCPU_STAT(io_exits) }, 163 { "mmio_exits", VCPU_STAT(mmio_exits) }, 164 { "signal_exits", VCPU_STAT(signal_exits) }, 165 { "irq_window", VCPU_STAT(irq_window_exits) }, 166 { "nmi_window", VCPU_STAT(nmi_window_exits) }, 167 { "halt_exits", VCPU_STAT(halt_exits) }, 168 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) }, 169 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) }, 170 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) }, 171 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 172 { "hypercalls", VCPU_STAT(hypercalls) }, 173 { "request_irq", VCPU_STAT(request_irq_exits) }, 174 { "irq_exits", VCPU_STAT(irq_exits) }, 175 { "host_state_reload", VCPU_STAT(host_state_reload) }, 176 { "efer_reload", VCPU_STAT(efer_reload) }, 177 { "fpu_reload", VCPU_STAT(fpu_reload) }, 178 { "insn_emulation", VCPU_STAT(insn_emulation) }, 179 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, 180 { "irq_injections", VCPU_STAT(irq_injections) }, 181 { "nmi_injections", VCPU_STAT(nmi_injections) }, 182 { "req_event", VCPU_STAT(req_event) }, 183 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, 184 { "mmu_pte_write", VM_STAT(mmu_pte_write) }, 185 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, 186 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, 187 { "mmu_flooded", VM_STAT(mmu_flooded) }, 188 { "mmu_recycled", VM_STAT(mmu_recycled) }, 189 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, 190 { "mmu_unsync", VM_STAT(mmu_unsync) }, 191 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, 192 { "largepages", VM_STAT(lpages) }, 193 { "max_mmu_page_hash_collisions", 194 VM_STAT(max_mmu_page_hash_collisions) }, 195 { NULL } 196 }; 197 198 u64 __read_mostly host_xcr0; 199 200 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); 201 202 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) 203 { 204 int i; 205 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) 206 vcpu->arch.apf.gfns[i] = ~0; 207 } 208 209 static void kvm_on_user_return(struct user_return_notifier *urn) 210 { 211 unsigned slot; 212 struct kvm_shared_msrs *locals 213 = container_of(urn, struct kvm_shared_msrs, urn); 214 struct kvm_shared_msr_values *values; 215 unsigned long flags; 216 217 /* 218 * Disabling irqs at this point since the following code could be 219 * interrupted and executed through kvm_arch_hardware_disable() 220 */ 221 local_irq_save(flags); 222 if (locals->registered) { 223 locals->registered = false; 224 user_return_notifier_unregister(urn); 225 } 226 local_irq_restore(flags); 227 for (slot = 0; slot < shared_msrs_global.nr; ++slot) { 228 values = &locals->values[slot]; 229 if (values->host != values->curr) { 230 wrmsrl(shared_msrs_global.msrs[slot], values->host); 231 values->curr = values->host; 232 } 233 } 234 } 235 236 static void shared_msr_update(unsigned slot, u32 msr) 237 { 238 u64 value; 239 unsigned int cpu = smp_processor_id(); 240 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 241 242 /* only read, and nobody should modify it at this time, 243 * so don't need lock */ 244 if (slot >= shared_msrs_global.nr) { 245 printk(KERN_ERR "kvm: invalid MSR slot!"); 246 return; 247 } 248 rdmsrl_safe(msr, &value); 249 smsr->values[slot].host = value; 250 smsr->values[slot].curr = value; 251 } 252 253 void kvm_define_shared_msr(unsigned slot, u32 msr) 254 { 255 BUG_ON(slot >= KVM_NR_SHARED_MSRS); 256 shared_msrs_global.msrs[slot] = msr; 257 if (slot >= shared_msrs_global.nr) 258 shared_msrs_global.nr = slot + 1; 259 } 260 EXPORT_SYMBOL_GPL(kvm_define_shared_msr); 261 262 static void kvm_shared_msr_cpu_online(void) 263 { 264 unsigned i; 265 266 for (i = 0; i < shared_msrs_global.nr; ++i) 267 shared_msr_update(i, shared_msrs_global.msrs[i]); 268 } 269 270 int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) 271 { 272 unsigned int cpu = smp_processor_id(); 273 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 274 int err; 275 276 if (((value ^ smsr->values[slot].curr) & mask) == 0) 277 return 0; 278 smsr->values[slot].curr = value; 279 err = wrmsrl_safe(shared_msrs_global.msrs[slot], value); 280 if (err) 281 return 1; 282 283 if (!smsr->registered) { 284 smsr->urn.on_user_return = kvm_on_user_return; 285 user_return_notifier_register(&smsr->urn); 286 smsr->registered = true; 287 } 288 return 0; 289 } 290 EXPORT_SYMBOL_GPL(kvm_set_shared_msr); 291 292 static void drop_user_return_notifiers(void) 293 { 294 unsigned int cpu = smp_processor_id(); 295 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); 296 297 if (smsr->registered) 298 kvm_on_user_return(&smsr->urn); 299 } 300 301 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) 302 { 303 return vcpu->arch.apic_base; 304 } 305 EXPORT_SYMBOL_GPL(kvm_get_apic_base); 306 307 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 308 { 309 u64 old_state = vcpu->arch.apic_base & 310 (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE); 311 u64 new_state = msr_info->data & 312 (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE); 313 u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) | 314 0x2ff | (guest_cpuid_has_x2apic(vcpu) ? 0 : X2APIC_ENABLE); 315 316 if (!msr_info->host_initiated && 317 ((msr_info->data & reserved_bits) != 0 || 318 new_state == X2APIC_ENABLE || 319 (new_state == MSR_IA32_APICBASE_ENABLE && 320 old_state == (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE)) || 321 (new_state == (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE) && 322 old_state == 0))) 323 return 1; 324 325 kvm_lapic_set_base(vcpu, msr_info->data); 326 return 0; 327 } 328 EXPORT_SYMBOL_GPL(kvm_set_apic_base); 329 330 asmlinkage __visible void kvm_spurious_fault(void) 331 { 332 /* Fault while not rebooting. We want the trace. */ 333 BUG(); 334 } 335 EXPORT_SYMBOL_GPL(kvm_spurious_fault); 336 337 #define EXCPT_BENIGN 0 338 #define EXCPT_CONTRIBUTORY 1 339 #define EXCPT_PF 2 340 341 static int exception_class(int vector) 342 { 343 switch (vector) { 344 case PF_VECTOR: 345 return EXCPT_PF; 346 case DE_VECTOR: 347 case TS_VECTOR: 348 case NP_VECTOR: 349 case SS_VECTOR: 350 case GP_VECTOR: 351 return EXCPT_CONTRIBUTORY; 352 default: 353 break; 354 } 355 return EXCPT_BENIGN; 356 } 357 358 #define EXCPT_FAULT 0 359 #define EXCPT_TRAP 1 360 #define EXCPT_ABORT 2 361 #define EXCPT_INTERRUPT 3 362 363 static int exception_type(int vector) 364 { 365 unsigned int mask; 366 367 if (WARN_ON(vector > 31 || vector == NMI_VECTOR)) 368 return EXCPT_INTERRUPT; 369 370 mask = 1 << vector; 371 372 /* #DB is trap, as instruction watchpoints are handled elsewhere */ 373 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR))) 374 return EXCPT_TRAP; 375 376 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR))) 377 return EXCPT_ABORT; 378 379 /* Reserved exceptions will result in fault */ 380 return EXCPT_FAULT; 381 } 382 383 static void kvm_multiple_exception(struct kvm_vcpu *vcpu, 384 unsigned nr, bool has_error, u32 error_code, 385 bool reinject) 386 { 387 u32 prev_nr; 388 int class1, class2; 389 390 kvm_make_request(KVM_REQ_EVENT, vcpu); 391 392 if (!vcpu->arch.exception.pending) { 393 queue: 394 if (has_error && !is_protmode(vcpu)) 395 has_error = false; 396 vcpu->arch.exception.pending = true; 397 vcpu->arch.exception.has_error_code = has_error; 398 vcpu->arch.exception.nr = nr; 399 vcpu->arch.exception.error_code = error_code; 400 vcpu->arch.exception.reinject = reinject; 401 return; 402 } 403 404 /* to check exception */ 405 prev_nr = vcpu->arch.exception.nr; 406 if (prev_nr == DF_VECTOR) { 407 /* triple fault -> shutdown */ 408 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 409 return; 410 } 411 class1 = exception_class(prev_nr); 412 class2 = exception_class(nr); 413 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) 414 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { 415 /* generate double fault per SDM Table 5-5 */ 416 vcpu->arch.exception.pending = true; 417 vcpu->arch.exception.has_error_code = true; 418 vcpu->arch.exception.nr = DF_VECTOR; 419 vcpu->arch.exception.error_code = 0; 420 } else 421 /* replace previous exception with a new one in a hope 422 that instruction re-execution will regenerate lost 423 exception */ 424 goto queue; 425 } 426 427 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) 428 { 429 kvm_multiple_exception(vcpu, nr, false, 0, false); 430 } 431 EXPORT_SYMBOL_GPL(kvm_queue_exception); 432 433 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) 434 { 435 kvm_multiple_exception(vcpu, nr, false, 0, true); 436 } 437 EXPORT_SYMBOL_GPL(kvm_requeue_exception); 438 439 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) 440 { 441 if (err) 442 kvm_inject_gp(vcpu, 0); 443 else 444 return kvm_skip_emulated_instruction(vcpu); 445 446 return 1; 447 } 448 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); 449 450 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 451 { 452 ++vcpu->stat.pf_guest; 453 vcpu->arch.exception.nested_apf = 454 is_guest_mode(vcpu) && fault->async_page_fault; 455 if (vcpu->arch.exception.nested_apf) 456 vcpu->arch.apf.nested_apf_token = fault->address; 457 else 458 vcpu->arch.cr2 = fault->address; 459 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); 460 } 461 EXPORT_SYMBOL_GPL(kvm_inject_page_fault); 462 463 static bool kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) 464 { 465 if (mmu_is_nested(vcpu) && !fault->nested_page_fault) 466 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault); 467 else 468 vcpu->arch.mmu.inject_page_fault(vcpu, fault); 469 470 return fault->nested_page_fault; 471 } 472 473 void kvm_inject_nmi(struct kvm_vcpu *vcpu) 474 { 475 atomic_inc(&vcpu->arch.nmi_queued); 476 kvm_make_request(KVM_REQ_NMI, vcpu); 477 } 478 EXPORT_SYMBOL_GPL(kvm_inject_nmi); 479 480 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 481 { 482 kvm_multiple_exception(vcpu, nr, true, error_code, false); 483 } 484 EXPORT_SYMBOL_GPL(kvm_queue_exception_e); 485 486 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) 487 { 488 kvm_multiple_exception(vcpu, nr, true, error_code, true); 489 } 490 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); 491 492 /* 493 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue 494 * a #GP and return false. 495 */ 496 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) 497 { 498 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) 499 return true; 500 kvm_queue_exception_e(vcpu, GP_VECTOR, 0); 501 return false; 502 } 503 EXPORT_SYMBOL_GPL(kvm_require_cpl); 504 505 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr) 506 { 507 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE)) 508 return true; 509 510 kvm_queue_exception(vcpu, UD_VECTOR); 511 return false; 512 } 513 EXPORT_SYMBOL_GPL(kvm_require_dr); 514 515 /* 516 * This function will be used to read from the physical memory of the currently 517 * running guest. The difference to kvm_vcpu_read_guest_page is that this function 518 * can read from guest physical or from the guest's guest physical memory. 519 */ 520 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, 521 gfn_t ngfn, void *data, int offset, int len, 522 u32 access) 523 { 524 struct x86_exception exception; 525 gfn_t real_gfn; 526 gpa_t ngpa; 527 528 ngpa = gfn_to_gpa(ngfn); 529 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception); 530 if (real_gfn == UNMAPPED_GVA) 531 return -EFAULT; 532 533 real_gfn = gpa_to_gfn(real_gfn); 534 535 return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len); 536 } 537 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); 538 539 static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, 540 void *data, int offset, int len, u32 access) 541 { 542 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, 543 data, offset, len, access); 544 } 545 546 /* 547 * Load the pae pdptrs. Return true is they are all valid. 548 */ 549 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) 550 { 551 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; 552 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; 553 int i; 554 int ret; 555 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; 556 557 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, 558 offset * sizeof(u64), sizeof(pdpte), 559 PFERR_USER_MASK|PFERR_WRITE_MASK); 560 if (ret < 0) { 561 ret = 0; 562 goto out; 563 } 564 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { 565 if ((pdpte[i] & PT_PRESENT_MASK) && 566 (pdpte[i] & 567 vcpu->arch.mmu.guest_rsvd_check.rsvd_bits_mask[0][2])) { 568 ret = 0; 569 goto out; 570 } 571 } 572 ret = 1; 573 574 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); 575 __set_bit(VCPU_EXREG_PDPTR, 576 (unsigned long *)&vcpu->arch.regs_avail); 577 __set_bit(VCPU_EXREG_PDPTR, 578 (unsigned long *)&vcpu->arch.regs_dirty); 579 out: 580 581 return ret; 582 } 583 EXPORT_SYMBOL_GPL(load_pdptrs); 584 585 bool pdptrs_changed(struct kvm_vcpu *vcpu) 586 { 587 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; 588 bool changed = true; 589 int offset; 590 gfn_t gfn; 591 int r; 592 593 if (is_long_mode(vcpu) || !is_pae(vcpu)) 594 return false; 595 596 if (!test_bit(VCPU_EXREG_PDPTR, 597 (unsigned long *)&vcpu->arch.regs_avail)) 598 return true; 599 600 gfn = (kvm_read_cr3(vcpu) & 0xffffffe0ul) >> PAGE_SHIFT; 601 offset = (kvm_read_cr3(vcpu) & 0xffffffe0ul) & (PAGE_SIZE - 1); 602 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), 603 PFERR_USER_MASK | PFERR_WRITE_MASK); 604 if (r < 0) 605 goto out; 606 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; 607 out: 608 609 return changed; 610 } 611 EXPORT_SYMBOL_GPL(pdptrs_changed); 612 613 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) 614 { 615 unsigned long old_cr0 = kvm_read_cr0(vcpu); 616 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP; 617 618 cr0 |= X86_CR0_ET; 619 620 #ifdef CONFIG_X86_64 621 if (cr0 & 0xffffffff00000000UL) 622 return 1; 623 #endif 624 625 cr0 &= ~CR0_RESERVED_BITS; 626 627 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) 628 return 1; 629 630 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) 631 return 1; 632 633 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { 634 #ifdef CONFIG_X86_64 635 if ((vcpu->arch.efer & EFER_LME)) { 636 int cs_db, cs_l; 637 638 if (!is_pae(vcpu)) 639 return 1; 640 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 641 if (cs_l) 642 return 1; 643 } else 644 #endif 645 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 646 kvm_read_cr3(vcpu))) 647 return 1; 648 } 649 650 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) 651 return 1; 652 653 kvm_x86_ops->set_cr0(vcpu, cr0); 654 655 if ((cr0 ^ old_cr0) & X86_CR0_PG) { 656 kvm_clear_async_pf_completion_queue(vcpu); 657 kvm_async_pf_hash_reset(vcpu); 658 } 659 660 if ((cr0 ^ old_cr0) & update_bits) 661 kvm_mmu_reset_context(vcpu); 662 663 if (((cr0 ^ old_cr0) & X86_CR0_CD) && 664 kvm_arch_has_noncoherent_dma(vcpu->kvm) && 665 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) 666 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL); 667 668 return 0; 669 } 670 EXPORT_SYMBOL_GPL(kvm_set_cr0); 671 672 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) 673 { 674 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); 675 } 676 EXPORT_SYMBOL_GPL(kvm_lmsw); 677 678 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu) 679 { 680 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) && 681 !vcpu->guest_xcr0_loaded) { 682 /* kvm_set_xcr() also depends on this */ 683 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0); 684 vcpu->guest_xcr0_loaded = 1; 685 } 686 } 687 688 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu) 689 { 690 if (vcpu->guest_xcr0_loaded) { 691 if (vcpu->arch.xcr0 != host_xcr0) 692 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0); 693 vcpu->guest_xcr0_loaded = 0; 694 } 695 } 696 697 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 698 { 699 u64 xcr0 = xcr; 700 u64 old_xcr0 = vcpu->arch.xcr0; 701 u64 valid_bits; 702 703 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ 704 if (index != XCR_XFEATURE_ENABLED_MASK) 705 return 1; 706 if (!(xcr0 & XFEATURE_MASK_FP)) 707 return 1; 708 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE)) 709 return 1; 710 711 /* 712 * Do not allow the guest to set bits that we do not support 713 * saving. However, xcr0 bit 0 is always set, even if the 714 * emulated CPU does not support XSAVE (see fx_init). 715 */ 716 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP; 717 if (xcr0 & ~valid_bits) 718 return 1; 719 720 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) != 721 (!(xcr0 & XFEATURE_MASK_BNDCSR))) 722 return 1; 723 724 if (xcr0 & XFEATURE_MASK_AVX512) { 725 if (!(xcr0 & XFEATURE_MASK_YMM)) 726 return 1; 727 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512) 728 return 1; 729 } 730 vcpu->arch.xcr0 = xcr0; 731 732 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND) 733 kvm_update_cpuid(vcpu); 734 return 0; 735 } 736 737 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) 738 { 739 if (kvm_x86_ops->get_cpl(vcpu) != 0 || 740 __kvm_set_xcr(vcpu, index, xcr)) { 741 kvm_inject_gp(vcpu, 0); 742 return 1; 743 } 744 return 0; 745 } 746 EXPORT_SYMBOL_GPL(kvm_set_xcr); 747 748 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 749 { 750 unsigned long old_cr4 = kvm_read_cr4(vcpu); 751 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE | 752 X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE; 753 754 if (cr4 & CR4_RESERVED_BITS) 755 return 1; 756 757 if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE)) 758 return 1; 759 760 if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP)) 761 return 1; 762 763 if (!guest_cpuid_has_smap(vcpu) && (cr4 & X86_CR4_SMAP)) 764 return 1; 765 766 if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_FSGSBASE)) 767 return 1; 768 769 if (!guest_cpuid_has_pku(vcpu) && (cr4 & X86_CR4_PKE)) 770 return 1; 771 772 if (is_long_mode(vcpu)) { 773 if (!(cr4 & X86_CR4_PAE)) 774 return 1; 775 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) 776 && ((cr4 ^ old_cr4) & pdptr_bits) 777 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, 778 kvm_read_cr3(vcpu))) 779 return 1; 780 781 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) { 782 if (!guest_cpuid_has_pcid(vcpu)) 783 return 1; 784 785 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */ 786 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu)) 787 return 1; 788 } 789 790 if (kvm_x86_ops->set_cr4(vcpu, cr4)) 791 return 1; 792 793 if (((cr4 ^ old_cr4) & pdptr_bits) || 794 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))) 795 kvm_mmu_reset_context(vcpu); 796 797 if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE)) 798 kvm_update_cpuid(vcpu); 799 800 return 0; 801 } 802 EXPORT_SYMBOL_GPL(kvm_set_cr4); 803 804 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 805 { 806 #ifdef CONFIG_X86_64 807 cr3 &= ~CR3_PCID_INVD; 808 #endif 809 810 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { 811 kvm_mmu_sync_roots(vcpu); 812 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 813 return 0; 814 } 815 816 if (is_long_mode(vcpu)) { 817 if (cr3 & CR3_L_MODE_RESERVED_BITS) 818 return 1; 819 } else if (is_pae(vcpu) && is_paging(vcpu) && 820 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) 821 return 1; 822 823 vcpu->arch.cr3 = cr3; 824 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 825 kvm_mmu_new_cr3(vcpu); 826 return 0; 827 } 828 EXPORT_SYMBOL_GPL(kvm_set_cr3); 829 830 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) 831 { 832 if (cr8 & CR8_RESERVED_BITS) 833 return 1; 834 if (lapic_in_kernel(vcpu)) 835 kvm_lapic_set_tpr(vcpu, cr8); 836 else 837 vcpu->arch.cr8 = cr8; 838 return 0; 839 } 840 EXPORT_SYMBOL_GPL(kvm_set_cr8); 841 842 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) 843 { 844 if (lapic_in_kernel(vcpu)) 845 return kvm_lapic_get_cr8(vcpu); 846 else 847 return vcpu->arch.cr8; 848 } 849 EXPORT_SYMBOL_GPL(kvm_get_cr8); 850 851 static void kvm_update_dr0123(struct kvm_vcpu *vcpu) 852 { 853 int i; 854 855 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { 856 for (i = 0; i < KVM_NR_DB_REGS; i++) 857 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 858 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD; 859 } 860 } 861 862 static void kvm_update_dr6(struct kvm_vcpu *vcpu) 863 { 864 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 865 kvm_x86_ops->set_dr6(vcpu, vcpu->arch.dr6); 866 } 867 868 static void kvm_update_dr7(struct kvm_vcpu *vcpu) 869 { 870 unsigned long dr7; 871 872 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 873 dr7 = vcpu->arch.guest_debug_dr7; 874 else 875 dr7 = vcpu->arch.dr7; 876 kvm_x86_ops->set_dr7(vcpu, dr7); 877 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED; 878 if (dr7 & DR7_BP_EN_MASK) 879 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED; 880 } 881 882 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu) 883 { 884 u64 fixed = DR6_FIXED_1; 885 886 if (!guest_cpuid_has_rtm(vcpu)) 887 fixed |= DR6_RTM; 888 return fixed; 889 } 890 891 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 892 { 893 switch (dr) { 894 case 0 ... 3: 895 vcpu->arch.db[dr] = val; 896 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) 897 vcpu->arch.eff_db[dr] = val; 898 break; 899 case 4: 900 /* fall through */ 901 case 6: 902 if (val & 0xffffffff00000000ULL) 903 return -1; /* #GP */ 904 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu); 905 kvm_update_dr6(vcpu); 906 break; 907 case 5: 908 /* fall through */ 909 default: /* 7 */ 910 if (val & 0xffffffff00000000ULL) 911 return -1; /* #GP */ 912 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; 913 kvm_update_dr7(vcpu); 914 break; 915 } 916 917 return 0; 918 } 919 920 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) 921 { 922 if (__kvm_set_dr(vcpu, dr, val)) { 923 kvm_inject_gp(vcpu, 0); 924 return 1; 925 } 926 return 0; 927 } 928 EXPORT_SYMBOL_GPL(kvm_set_dr); 929 930 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) 931 { 932 switch (dr) { 933 case 0 ... 3: 934 *val = vcpu->arch.db[dr]; 935 break; 936 case 4: 937 /* fall through */ 938 case 6: 939 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) 940 *val = vcpu->arch.dr6; 941 else 942 *val = kvm_x86_ops->get_dr6(vcpu); 943 break; 944 case 5: 945 /* fall through */ 946 default: /* 7 */ 947 *val = vcpu->arch.dr7; 948 break; 949 } 950 return 0; 951 } 952 EXPORT_SYMBOL_GPL(kvm_get_dr); 953 954 bool kvm_rdpmc(struct kvm_vcpu *vcpu) 955 { 956 u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); 957 u64 data; 958 int err; 959 960 err = kvm_pmu_rdpmc(vcpu, ecx, &data); 961 if (err) 962 return err; 963 kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data); 964 kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32); 965 return err; 966 } 967 EXPORT_SYMBOL_GPL(kvm_rdpmc); 968 969 /* 970 * List of msr numbers which we expose to userspace through KVM_GET_MSRS 971 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. 972 * 973 * This list is modified at module load time to reflect the 974 * capabilities of the host cpu. This capabilities test skips MSRs that are 975 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs 976 * may depend on host virtualization features rather than host cpu features. 977 */ 978 979 static u32 msrs_to_save[] = { 980 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, 981 MSR_STAR, 982 #ifdef CONFIG_X86_64 983 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, 984 #endif 985 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA, 986 MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS, MSR_TSC_AUX, 987 }; 988 989 static unsigned num_msrs_to_save; 990 991 static u32 emulated_msrs[] = { 992 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, 993 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, 994 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, 995 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC, 996 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2, 997 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL, 998 HV_X64_MSR_RESET, 999 HV_X64_MSR_VP_INDEX, 1000 HV_X64_MSR_VP_RUNTIME, 1001 HV_X64_MSR_SCONTROL, 1002 HV_X64_MSR_STIMER0_CONFIG, 1003 HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, 1004 MSR_KVM_PV_EOI_EN, 1005 1006 MSR_IA32_TSC_ADJUST, 1007 MSR_IA32_TSCDEADLINE, 1008 MSR_IA32_MISC_ENABLE, 1009 MSR_IA32_MCG_STATUS, 1010 MSR_IA32_MCG_CTL, 1011 MSR_IA32_MCG_EXT_CTL, 1012 MSR_IA32_SMBASE, 1013 MSR_PLATFORM_INFO, 1014 MSR_MISC_FEATURES_ENABLES, 1015 }; 1016 1017 static unsigned num_emulated_msrs; 1018 1019 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer) 1020 { 1021 if (efer & efer_reserved_bits) 1022 return false; 1023 1024 if (efer & EFER_FFXSR) { 1025 struct kvm_cpuid_entry2 *feat; 1026 1027 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); 1028 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) 1029 return false; 1030 } 1031 1032 if (efer & EFER_SVME) { 1033 struct kvm_cpuid_entry2 *feat; 1034 1035 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); 1036 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) 1037 return false; 1038 } 1039 1040 return true; 1041 } 1042 EXPORT_SYMBOL_GPL(kvm_valid_efer); 1043 1044 static int set_efer(struct kvm_vcpu *vcpu, u64 efer) 1045 { 1046 u64 old_efer = vcpu->arch.efer; 1047 1048 if (!kvm_valid_efer(vcpu, efer)) 1049 return 1; 1050 1051 if (is_paging(vcpu) 1052 && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) 1053 return 1; 1054 1055 efer &= ~EFER_LMA; 1056 efer |= vcpu->arch.efer & EFER_LMA; 1057 1058 kvm_x86_ops->set_efer(vcpu, efer); 1059 1060 /* Update reserved bits */ 1061 if ((efer ^ old_efer) & EFER_NX) 1062 kvm_mmu_reset_context(vcpu); 1063 1064 return 0; 1065 } 1066 1067 void kvm_enable_efer_bits(u64 mask) 1068 { 1069 efer_reserved_bits &= ~mask; 1070 } 1071 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); 1072 1073 /* 1074 * Writes msr value into into the appropriate "register". 1075 * Returns 0 on success, non-0 otherwise. 1076 * Assumes vcpu_load() was already called. 1077 */ 1078 int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) 1079 { 1080 switch (msr->index) { 1081 case MSR_FS_BASE: 1082 case MSR_GS_BASE: 1083 case MSR_KERNEL_GS_BASE: 1084 case MSR_CSTAR: 1085 case MSR_LSTAR: 1086 if (is_noncanonical_address(msr->data)) 1087 return 1; 1088 break; 1089 case MSR_IA32_SYSENTER_EIP: 1090 case MSR_IA32_SYSENTER_ESP: 1091 /* 1092 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if 1093 * non-canonical address is written on Intel but not on 1094 * AMD (which ignores the top 32-bits, because it does 1095 * not implement 64-bit SYSENTER). 1096 * 1097 * 64-bit code should hence be able to write a non-canonical 1098 * value on AMD. Making the address canonical ensures that 1099 * vmentry does not fail on Intel after writing a non-canonical 1100 * value, and that something deterministic happens if the guest 1101 * invokes 64-bit SYSENTER. 1102 */ 1103 msr->data = get_canonical(msr->data); 1104 } 1105 return kvm_x86_ops->set_msr(vcpu, msr); 1106 } 1107 EXPORT_SYMBOL_GPL(kvm_set_msr); 1108 1109 /* 1110 * Adapt set_msr() to msr_io()'s calling convention 1111 */ 1112 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1113 { 1114 struct msr_data msr; 1115 int r; 1116 1117 msr.index = index; 1118 msr.host_initiated = true; 1119 r = kvm_get_msr(vcpu, &msr); 1120 if (r) 1121 return r; 1122 1123 *data = msr.data; 1124 return 0; 1125 } 1126 1127 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) 1128 { 1129 struct msr_data msr; 1130 1131 msr.data = *data; 1132 msr.index = index; 1133 msr.host_initiated = true; 1134 return kvm_set_msr(vcpu, &msr); 1135 } 1136 1137 #ifdef CONFIG_X86_64 1138 struct pvclock_gtod_data { 1139 seqcount_t seq; 1140 1141 struct { /* extract of a clocksource struct */ 1142 int vclock_mode; 1143 u64 cycle_last; 1144 u64 mask; 1145 u32 mult; 1146 u32 shift; 1147 } clock; 1148 1149 u64 boot_ns; 1150 u64 nsec_base; 1151 u64 wall_time_sec; 1152 }; 1153 1154 static struct pvclock_gtod_data pvclock_gtod_data; 1155 1156 static void update_pvclock_gtod(struct timekeeper *tk) 1157 { 1158 struct pvclock_gtod_data *vdata = &pvclock_gtod_data; 1159 u64 boot_ns; 1160 1161 boot_ns = ktime_to_ns(ktime_add(tk->tkr_mono.base, tk->offs_boot)); 1162 1163 write_seqcount_begin(&vdata->seq); 1164 1165 /* copy pvclock gtod data */ 1166 vdata->clock.vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode; 1167 vdata->clock.cycle_last = tk->tkr_mono.cycle_last; 1168 vdata->clock.mask = tk->tkr_mono.mask; 1169 vdata->clock.mult = tk->tkr_mono.mult; 1170 vdata->clock.shift = tk->tkr_mono.shift; 1171 1172 vdata->boot_ns = boot_ns; 1173 vdata->nsec_base = tk->tkr_mono.xtime_nsec; 1174 1175 vdata->wall_time_sec = tk->xtime_sec; 1176 1177 write_seqcount_end(&vdata->seq); 1178 } 1179 #endif 1180 1181 void kvm_set_pending_timer(struct kvm_vcpu *vcpu) 1182 { 1183 /* 1184 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in 1185 * vcpu_enter_guest. This function is only called from 1186 * the physical CPU that is running vcpu. 1187 */ 1188 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); 1189 } 1190 1191 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) 1192 { 1193 int version; 1194 int r; 1195 struct pvclock_wall_clock wc; 1196 struct timespec64 boot; 1197 1198 if (!wall_clock) 1199 return; 1200 1201 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); 1202 if (r) 1203 return; 1204 1205 if (version & 1) 1206 ++version; /* first time write, random junk */ 1207 1208 ++version; 1209 1210 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version))) 1211 return; 1212 1213 /* 1214 * The guest calculates current wall clock time by adding 1215 * system time (updated by kvm_guest_time_update below) to the 1216 * wall clock specified here. guest system time equals host 1217 * system time for us, thus we must fill in host boot time here. 1218 */ 1219 getboottime64(&boot); 1220 1221 if (kvm->arch.kvmclock_offset) { 1222 struct timespec64 ts = ns_to_timespec64(kvm->arch.kvmclock_offset); 1223 boot = timespec64_sub(boot, ts); 1224 } 1225 wc.sec = (u32)boot.tv_sec; /* overflow in 2106 guest time */ 1226 wc.nsec = boot.tv_nsec; 1227 wc.version = version; 1228 1229 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); 1230 1231 version++; 1232 kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); 1233 } 1234 1235 static uint32_t div_frac(uint32_t dividend, uint32_t divisor) 1236 { 1237 do_shl32_div32(dividend, divisor); 1238 return dividend; 1239 } 1240 1241 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz, 1242 s8 *pshift, u32 *pmultiplier) 1243 { 1244 uint64_t scaled64; 1245 int32_t shift = 0; 1246 uint64_t tps64; 1247 uint32_t tps32; 1248 1249 tps64 = base_hz; 1250 scaled64 = scaled_hz; 1251 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { 1252 tps64 >>= 1; 1253 shift--; 1254 } 1255 1256 tps32 = (uint32_t)tps64; 1257 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { 1258 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) 1259 scaled64 >>= 1; 1260 else 1261 tps32 <<= 1; 1262 shift++; 1263 } 1264 1265 *pshift = shift; 1266 *pmultiplier = div_frac(scaled64, tps32); 1267 1268 pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n", 1269 __func__, base_hz, scaled_hz, shift, *pmultiplier); 1270 } 1271 1272 #ifdef CONFIG_X86_64 1273 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0); 1274 #endif 1275 1276 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); 1277 static unsigned long max_tsc_khz; 1278 1279 static u32 adjust_tsc_khz(u32 khz, s32 ppm) 1280 { 1281 u64 v = (u64)khz * (1000000 + ppm); 1282 do_div(v, 1000000); 1283 return v; 1284 } 1285 1286 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) 1287 { 1288 u64 ratio; 1289 1290 /* Guest TSC same frequency as host TSC? */ 1291 if (!scale) { 1292 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1293 return 0; 1294 } 1295 1296 /* TSC scaling supported? */ 1297 if (!kvm_has_tsc_control) { 1298 if (user_tsc_khz > tsc_khz) { 1299 vcpu->arch.tsc_catchup = 1; 1300 vcpu->arch.tsc_always_catchup = 1; 1301 return 0; 1302 } else { 1303 WARN(1, "user requested TSC rate below hardware speed\n"); 1304 return -1; 1305 } 1306 } 1307 1308 /* TSC scaling required - calculate ratio */ 1309 ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits, 1310 user_tsc_khz, tsc_khz); 1311 1312 if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) { 1313 WARN_ONCE(1, "Invalid TSC scaling ratio - virtual-tsc-khz=%u\n", 1314 user_tsc_khz); 1315 return -1; 1316 } 1317 1318 vcpu->arch.tsc_scaling_ratio = ratio; 1319 return 0; 1320 } 1321 1322 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) 1323 { 1324 u32 thresh_lo, thresh_hi; 1325 int use_scaling = 0; 1326 1327 /* tsc_khz can be zero if TSC calibration fails */ 1328 if (user_tsc_khz == 0) { 1329 /* set tsc_scaling_ratio to a safe value */ 1330 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio; 1331 return -1; 1332 } 1333 1334 /* Compute a scale to convert nanoseconds in TSC cycles */ 1335 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC, 1336 &vcpu->arch.virtual_tsc_shift, 1337 &vcpu->arch.virtual_tsc_mult); 1338 vcpu->arch.virtual_tsc_khz = user_tsc_khz; 1339 1340 /* 1341 * Compute the variation in TSC rate which is acceptable 1342 * within the range of tolerance and decide if the 1343 * rate being applied is within that bounds of the hardware 1344 * rate. If so, no scaling or compensation need be done. 1345 */ 1346 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm); 1347 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm); 1348 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) { 1349 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi); 1350 use_scaling = 1; 1351 } 1352 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling); 1353 } 1354 1355 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) 1356 { 1357 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec, 1358 vcpu->arch.virtual_tsc_mult, 1359 vcpu->arch.virtual_tsc_shift); 1360 tsc += vcpu->arch.this_tsc_write; 1361 return tsc; 1362 } 1363 1364 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu) 1365 { 1366 #ifdef CONFIG_X86_64 1367 bool vcpus_matched; 1368 struct kvm_arch *ka = &vcpu->kvm->arch; 1369 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1370 1371 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 1372 atomic_read(&vcpu->kvm->online_vcpus)); 1373 1374 /* 1375 * Once the masterclock is enabled, always perform request in 1376 * order to update it. 1377 * 1378 * In order to enable masterclock, the host clocksource must be TSC 1379 * and the vcpus need to have matched TSCs. When that happens, 1380 * perform request to enable masterclock. 1381 */ 1382 if (ka->use_master_clock || 1383 (gtod->clock.vclock_mode == VCLOCK_TSC && vcpus_matched)) 1384 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 1385 1386 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc, 1387 atomic_read(&vcpu->kvm->online_vcpus), 1388 ka->use_master_clock, gtod->clock.vclock_mode); 1389 #endif 1390 } 1391 1392 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset) 1393 { 1394 u64 curr_offset = vcpu->arch.tsc_offset; 1395 vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset; 1396 } 1397 1398 /* 1399 * Multiply tsc by a fixed point number represented by ratio. 1400 * 1401 * The most significant 64-N bits (mult) of ratio represent the 1402 * integral part of the fixed point number; the remaining N bits 1403 * (frac) represent the fractional part, ie. ratio represents a fixed 1404 * point number (mult + frac * 2^(-N)). 1405 * 1406 * N equals to kvm_tsc_scaling_ratio_frac_bits. 1407 */ 1408 static inline u64 __scale_tsc(u64 ratio, u64 tsc) 1409 { 1410 return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits); 1411 } 1412 1413 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc) 1414 { 1415 u64 _tsc = tsc; 1416 u64 ratio = vcpu->arch.tsc_scaling_ratio; 1417 1418 if (ratio != kvm_default_tsc_scaling_ratio) 1419 _tsc = __scale_tsc(ratio, tsc); 1420 1421 return _tsc; 1422 } 1423 EXPORT_SYMBOL_GPL(kvm_scale_tsc); 1424 1425 static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) 1426 { 1427 u64 tsc; 1428 1429 tsc = kvm_scale_tsc(vcpu, rdtsc()); 1430 1431 return target_tsc - tsc; 1432 } 1433 1434 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc) 1435 { 1436 return vcpu->arch.tsc_offset + kvm_scale_tsc(vcpu, host_tsc); 1437 } 1438 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc); 1439 1440 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) 1441 { 1442 kvm_x86_ops->write_tsc_offset(vcpu, offset); 1443 vcpu->arch.tsc_offset = offset; 1444 } 1445 1446 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr) 1447 { 1448 struct kvm *kvm = vcpu->kvm; 1449 u64 offset, ns, elapsed; 1450 unsigned long flags; 1451 bool matched; 1452 bool already_matched; 1453 u64 data = msr->data; 1454 bool synchronizing = false; 1455 1456 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); 1457 offset = kvm_compute_tsc_offset(vcpu, data); 1458 ns = ktime_get_boot_ns(); 1459 elapsed = ns - kvm->arch.last_tsc_nsec; 1460 1461 if (vcpu->arch.virtual_tsc_khz) { 1462 if (data == 0 && msr->host_initiated) { 1463 /* 1464 * detection of vcpu initialization -- need to sync 1465 * with other vCPUs. This particularly helps to keep 1466 * kvm_clock stable after CPU hotplug 1467 */ 1468 synchronizing = true; 1469 } else { 1470 u64 tsc_exp = kvm->arch.last_tsc_write + 1471 nsec_to_cycles(vcpu, elapsed); 1472 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL; 1473 /* 1474 * Special case: TSC write with a small delta (1 second) 1475 * of virtual cycle time against real time is 1476 * interpreted as an attempt to synchronize the CPU. 1477 */ 1478 synchronizing = data < tsc_exp + tsc_hz && 1479 data + tsc_hz > tsc_exp; 1480 } 1481 } 1482 1483 /* 1484 * For a reliable TSC, we can match TSC offsets, and for an unstable 1485 * TSC, we add elapsed time in this computation. We could let the 1486 * compensation code attempt to catch up if we fall behind, but 1487 * it's better to try to match offsets from the beginning. 1488 */ 1489 if (synchronizing && 1490 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) { 1491 if (!check_tsc_unstable()) { 1492 offset = kvm->arch.cur_tsc_offset; 1493 pr_debug("kvm: matched tsc offset for %llu\n", data); 1494 } else { 1495 u64 delta = nsec_to_cycles(vcpu, elapsed); 1496 data += delta; 1497 offset = kvm_compute_tsc_offset(vcpu, data); 1498 pr_debug("kvm: adjusted tsc offset by %llu\n", delta); 1499 } 1500 matched = true; 1501 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation); 1502 } else { 1503 /* 1504 * We split periods of matched TSC writes into generations. 1505 * For each generation, we track the original measured 1506 * nanosecond time, offset, and write, so if TSCs are in 1507 * sync, we can match exact offset, and if not, we can match 1508 * exact software computation in compute_guest_tsc() 1509 * 1510 * These values are tracked in kvm->arch.cur_xxx variables. 1511 */ 1512 kvm->arch.cur_tsc_generation++; 1513 kvm->arch.cur_tsc_nsec = ns; 1514 kvm->arch.cur_tsc_write = data; 1515 kvm->arch.cur_tsc_offset = offset; 1516 matched = false; 1517 pr_debug("kvm: new tsc generation %llu, clock %llu\n", 1518 kvm->arch.cur_tsc_generation, data); 1519 } 1520 1521 /* 1522 * We also track th most recent recorded KHZ, write and time to 1523 * allow the matching interval to be extended at each write. 1524 */ 1525 kvm->arch.last_tsc_nsec = ns; 1526 kvm->arch.last_tsc_write = data; 1527 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz; 1528 1529 vcpu->arch.last_guest_tsc = data; 1530 1531 /* Keep track of which generation this VCPU has synchronized to */ 1532 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation; 1533 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec; 1534 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write; 1535 1536 if (guest_cpuid_has_tsc_adjust(vcpu) && !msr->host_initiated) 1537 update_ia32_tsc_adjust_msr(vcpu, offset); 1538 kvm_vcpu_write_tsc_offset(vcpu, offset); 1539 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); 1540 1541 spin_lock(&kvm->arch.pvclock_gtod_sync_lock); 1542 if (!matched) { 1543 kvm->arch.nr_vcpus_matched_tsc = 0; 1544 } else if (!already_matched) { 1545 kvm->arch.nr_vcpus_matched_tsc++; 1546 } 1547 1548 kvm_track_tsc_matching(vcpu); 1549 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock); 1550 } 1551 1552 EXPORT_SYMBOL_GPL(kvm_write_tsc); 1553 1554 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, 1555 s64 adjustment) 1556 { 1557 kvm_vcpu_write_tsc_offset(vcpu, vcpu->arch.tsc_offset + adjustment); 1558 } 1559 1560 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment) 1561 { 1562 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio) 1563 WARN_ON(adjustment < 0); 1564 adjustment = kvm_scale_tsc(vcpu, (u64) adjustment); 1565 adjust_tsc_offset_guest(vcpu, adjustment); 1566 } 1567 1568 #ifdef CONFIG_X86_64 1569 1570 static u64 read_tsc(void) 1571 { 1572 u64 ret = (u64)rdtsc_ordered(); 1573 u64 last = pvclock_gtod_data.clock.cycle_last; 1574 1575 if (likely(ret >= last)) 1576 return ret; 1577 1578 /* 1579 * GCC likes to generate cmov here, but this branch is extremely 1580 * predictable (it's just a function of time and the likely is 1581 * very likely) and there's a data dependence, so force GCC 1582 * to generate a branch instead. I don't barrier() because 1583 * we don't actually need a barrier, and if this function 1584 * ever gets inlined it will generate worse code. 1585 */ 1586 asm volatile (""); 1587 return last; 1588 } 1589 1590 static inline u64 vgettsc(u64 *cycle_now) 1591 { 1592 long v; 1593 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1594 1595 *cycle_now = read_tsc(); 1596 1597 v = (*cycle_now - gtod->clock.cycle_last) & gtod->clock.mask; 1598 return v * gtod->clock.mult; 1599 } 1600 1601 static int do_monotonic_boot(s64 *t, u64 *cycle_now) 1602 { 1603 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1604 unsigned long seq; 1605 int mode; 1606 u64 ns; 1607 1608 do { 1609 seq = read_seqcount_begin(>od->seq); 1610 mode = gtod->clock.vclock_mode; 1611 ns = gtod->nsec_base; 1612 ns += vgettsc(cycle_now); 1613 ns >>= gtod->clock.shift; 1614 ns += gtod->boot_ns; 1615 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 1616 *t = ns; 1617 1618 return mode; 1619 } 1620 1621 static int do_realtime(struct timespec *ts, u64 *cycle_now) 1622 { 1623 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 1624 unsigned long seq; 1625 int mode; 1626 u64 ns; 1627 1628 do { 1629 seq = read_seqcount_begin(>od->seq); 1630 mode = gtod->clock.vclock_mode; 1631 ts->tv_sec = gtod->wall_time_sec; 1632 ns = gtod->nsec_base; 1633 ns += vgettsc(cycle_now); 1634 ns >>= gtod->clock.shift; 1635 } while (unlikely(read_seqcount_retry(>od->seq, seq))); 1636 1637 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns); 1638 ts->tv_nsec = ns; 1639 1640 return mode; 1641 } 1642 1643 /* returns true if host is using tsc clocksource */ 1644 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *cycle_now) 1645 { 1646 /* checked again under seqlock below */ 1647 if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC) 1648 return false; 1649 1650 return do_monotonic_boot(kernel_ns, cycle_now) == VCLOCK_TSC; 1651 } 1652 1653 /* returns true if host is using tsc clocksource */ 1654 static bool kvm_get_walltime_and_clockread(struct timespec *ts, 1655 u64 *cycle_now) 1656 { 1657 /* checked again under seqlock below */ 1658 if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC) 1659 return false; 1660 1661 return do_realtime(ts, cycle_now) == VCLOCK_TSC; 1662 } 1663 #endif 1664 1665 /* 1666 * 1667 * Assuming a stable TSC across physical CPUS, and a stable TSC 1668 * across virtual CPUs, the following condition is possible. 1669 * Each numbered line represents an event visible to both 1670 * CPUs at the next numbered event. 1671 * 1672 * "timespecX" represents host monotonic time. "tscX" represents 1673 * RDTSC value. 1674 * 1675 * VCPU0 on CPU0 | VCPU1 on CPU1 1676 * 1677 * 1. read timespec0,tsc0 1678 * 2. | timespec1 = timespec0 + N 1679 * | tsc1 = tsc0 + M 1680 * 3. transition to guest | transition to guest 1681 * 4. ret0 = timespec0 + (rdtsc - tsc0) | 1682 * 5. | ret1 = timespec1 + (rdtsc - tsc1) 1683 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M)) 1684 * 1685 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity: 1686 * 1687 * - ret0 < ret1 1688 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M)) 1689 * ... 1690 * - 0 < N - M => M < N 1691 * 1692 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not 1693 * always the case (the difference between two distinct xtime instances 1694 * might be smaller then the difference between corresponding TSC reads, 1695 * when updating guest vcpus pvclock areas). 1696 * 1697 * To avoid that problem, do not allow visibility of distinct 1698 * system_timestamp/tsc_timestamp values simultaneously: use a master 1699 * copy of host monotonic time values. Update that master copy 1700 * in lockstep. 1701 * 1702 * Rely on synchronization of host TSCs and guest TSCs for monotonicity. 1703 * 1704 */ 1705 1706 static void pvclock_update_vm_gtod_copy(struct kvm *kvm) 1707 { 1708 #ifdef CONFIG_X86_64 1709 struct kvm_arch *ka = &kvm->arch; 1710 int vclock_mode; 1711 bool host_tsc_clocksource, vcpus_matched; 1712 1713 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 == 1714 atomic_read(&kvm->online_vcpus)); 1715 1716 /* 1717 * If the host uses TSC clock, then passthrough TSC as stable 1718 * to the guest. 1719 */ 1720 host_tsc_clocksource = kvm_get_time_and_clockread( 1721 &ka->master_kernel_ns, 1722 &ka->master_cycle_now); 1723 1724 ka->use_master_clock = host_tsc_clocksource && vcpus_matched 1725 && !ka->backwards_tsc_observed 1726 && !ka->boot_vcpu_runs_old_kvmclock; 1727 1728 if (ka->use_master_clock) 1729 atomic_set(&kvm_guest_has_master_clock, 1); 1730 1731 vclock_mode = pvclock_gtod_data.clock.vclock_mode; 1732 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode, 1733 vcpus_matched); 1734 #endif 1735 } 1736 1737 void kvm_make_mclock_inprogress_request(struct kvm *kvm) 1738 { 1739 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); 1740 } 1741 1742 static void kvm_gen_update_masterclock(struct kvm *kvm) 1743 { 1744 #ifdef CONFIG_X86_64 1745 int i; 1746 struct kvm_vcpu *vcpu; 1747 struct kvm_arch *ka = &kvm->arch; 1748 1749 spin_lock(&ka->pvclock_gtod_sync_lock); 1750 kvm_make_mclock_inprogress_request(kvm); 1751 /* no guest entries from this point */ 1752 pvclock_update_vm_gtod_copy(kvm); 1753 1754 kvm_for_each_vcpu(i, vcpu, kvm) 1755 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 1756 1757 /* guest entries allowed */ 1758 kvm_for_each_vcpu(i, vcpu, kvm) 1759 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu); 1760 1761 spin_unlock(&ka->pvclock_gtod_sync_lock); 1762 #endif 1763 } 1764 1765 u64 get_kvmclock_ns(struct kvm *kvm) 1766 { 1767 struct kvm_arch *ka = &kvm->arch; 1768 struct pvclock_vcpu_time_info hv_clock; 1769 u64 ret; 1770 1771 spin_lock(&ka->pvclock_gtod_sync_lock); 1772 if (!ka->use_master_clock) { 1773 spin_unlock(&ka->pvclock_gtod_sync_lock); 1774 return ktime_get_boot_ns() + ka->kvmclock_offset; 1775 } 1776 1777 hv_clock.tsc_timestamp = ka->master_cycle_now; 1778 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; 1779 spin_unlock(&ka->pvclock_gtod_sync_lock); 1780 1781 /* both __this_cpu_read() and rdtsc() should be on the same cpu */ 1782 get_cpu(); 1783 1784 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL, 1785 &hv_clock.tsc_shift, 1786 &hv_clock.tsc_to_system_mul); 1787 ret = __pvclock_read_cycles(&hv_clock, rdtsc()); 1788 1789 put_cpu(); 1790 1791 return ret; 1792 } 1793 1794 static void kvm_setup_pvclock_page(struct kvm_vcpu *v) 1795 { 1796 struct kvm_vcpu_arch *vcpu = &v->arch; 1797 struct pvclock_vcpu_time_info guest_hv_clock; 1798 1799 if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time, 1800 &guest_hv_clock, sizeof(guest_hv_clock)))) 1801 return; 1802 1803 /* This VCPU is paused, but it's legal for a guest to read another 1804 * VCPU's kvmclock, so we really have to follow the specification where 1805 * it says that version is odd if data is being modified, and even after 1806 * it is consistent. 1807 * 1808 * Version field updates must be kept separate. This is because 1809 * kvm_write_guest_cached might use a "rep movs" instruction, and 1810 * writes within a string instruction are weakly ordered. So there 1811 * are three writes overall. 1812 * 1813 * As a small optimization, only write the version field in the first 1814 * and third write. The vcpu->pv_time cache is still valid, because the 1815 * version field is the first in the struct. 1816 */ 1817 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0); 1818 1819 vcpu->hv_clock.version = guest_hv_clock.version + 1; 1820 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 1821 &vcpu->hv_clock, 1822 sizeof(vcpu->hv_clock.version)); 1823 1824 smp_wmb(); 1825 1826 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */ 1827 vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED); 1828 1829 if (vcpu->pvclock_set_guest_stopped_request) { 1830 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED; 1831 vcpu->pvclock_set_guest_stopped_request = false; 1832 } 1833 1834 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock); 1835 1836 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 1837 &vcpu->hv_clock, 1838 sizeof(vcpu->hv_clock)); 1839 1840 smp_wmb(); 1841 1842 vcpu->hv_clock.version++; 1843 kvm_write_guest_cached(v->kvm, &vcpu->pv_time, 1844 &vcpu->hv_clock, 1845 sizeof(vcpu->hv_clock.version)); 1846 } 1847 1848 static int kvm_guest_time_update(struct kvm_vcpu *v) 1849 { 1850 unsigned long flags, tgt_tsc_khz; 1851 struct kvm_vcpu_arch *vcpu = &v->arch; 1852 struct kvm_arch *ka = &v->kvm->arch; 1853 s64 kernel_ns; 1854 u64 tsc_timestamp, host_tsc; 1855 u8 pvclock_flags; 1856 bool use_master_clock; 1857 1858 kernel_ns = 0; 1859 host_tsc = 0; 1860 1861 /* 1862 * If the host uses TSC clock, then passthrough TSC as stable 1863 * to the guest. 1864 */ 1865 spin_lock(&ka->pvclock_gtod_sync_lock); 1866 use_master_clock = ka->use_master_clock; 1867 if (use_master_clock) { 1868 host_tsc = ka->master_cycle_now; 1869 kernel_ns = ka->master_kernel_ns; 1870 } 1871 spin_unlock(&ka->pvclock_gtod_sync_lock); 1872 1873 /* Keep irq disabled to prevent changes to the clock */ 1874 local_irq_save(flags); 1875 tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz); 1876 if (unlikely(tgt_tsc_khz == 0)) { 1877 local_irq_restore(flags); 1878 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 1879 return 1; 1880 } 1881 if (!use_master_clock) { 1882 host_tsc = rdtsc(); 1883 kernel_ns = ktime_get_boot_ns(); 1884 } 1885 1886 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc); 1887 1888 /* 1889 * We may have to catch up the TSC to match elapsed wall clock 1890 * time for two reasons, even if kvmclock is used. 1891 * 1) CPU could have been running below the maximum TSC rate 1892 * 2) Broken TSC compensation resets the base at each VCPU 1893 * entry to avoid unknown leaps of TSC even when running 1894 * again on the same CPU. This may cause apparent elapsed 1895 * time to disappear, and the guest to stand still or run 1896 * very slowly. 1897 */ 1898 if (vcpu->tsc_catchup) { 1899 u64 tsc = compute_guest_tsc(v, kernel_ns); 1900 if (tsc > tsc_timestamp) { 1901 adjust_tsc_offset_guest(v, tsc - tsc_timestamp); 1902 tsc_timestamp = tsc; 1903 } 1904 } 1905 1906 local_irq_restore(flags); 1907 1908 /* With all the info we got, fill in the values */ 1909 1910 if (kvm_has_tsc_control) 1911 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz); 1912 1913 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) { 1914 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL, 1915 &vcpu->hv_clock.tsc_shift, 1916 &vcpu->hv_clock.tsc_to_system_mul); 1917 vcpu->hw_tsc_khz = tgt_tsc_khz; 1918 } 1919 1920 vcpu->hv_clock.tsc_timestamp = tsc_timestamp; 1921 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; 1922 vcpu->last_guest_tsc = tsc_timestamp; 1923 1924 /* If the host uses TSC clocksource, then it is stable */ 1925 pvclock_flags = 0; 1926 if (use_master_clock) 1927 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT; 1928 1929 vcpu->hv_clock.flags = pvclock_flags; 1930 1931 if (vcpu->pv_time_enabled) 1932 kvm_setup_pvclock_page(v); 1933 if (v == kvm_get_vcpu(v->kvm, 0)) 1934 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock); 1935 return 0; 1936 } 1937 1938 /* 1939 * kvmclock updates which are isolated to a given vcpu, such as 1940 * vcpu->cpu migration, should not allow system_timestamp from 1941 * the rest of the vcpus to remain static. Otherwise ntp frequency 1942 * correction applies to one vcpu's system_timestamp but not 1943 * the others. 1944 * 1945 * So in those cases, request a kvmclock update for all vcpus. 1946 * We need to rate-limit these requests though, as they can 1947 * considerably slow guests that have a large number of vcpus. 1948 * The time for a remote vcpu to update its kvmclock is bound 1949 * by the delay we use to rate-limit the updates. 1950 */ 1951 1952 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100) 1953 1954 static void kvmclock_update_fn(struct work_struct *work) 1955 { 1956 int i; 1957 struct delayed_work *dwork = to_delayed_work(work); 1958 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 1959 kvmclock_update_work); 1960 struct kvm *kvm = container_of(ka, struct kvm, arch); 1961 struct kvm_vcpu *vcpu; 1962 1963 kvm_for_each_vcpu(i, vcpu, kvm) { 1964 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 1965 kvm_vcpu_kick(vcpu); 1966 } 1967 } 1968 1969 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v) 1970 { 1971 struct kvm *kvm = v->kvm; 1972 1973 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); 1974 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 1975 KVMCLOCK_UPDATE_DELAY); 1976 } 1977 1978 #define KVMCLOCK_SYNC_PERIOD (300 * HZ) 1979 1980 static void kvmclock_sync_fn(struct work_struct *work) 1981 { 1982 struct delayed_work *dwork = to_delayed_work(work); 1983 struct kvm_arch *ka = container_of(dwork, struct kvm_arch, 1984 kvmclock_sync_work); 1985 struct kvm *kvm = container_of(ka, struct kvm, arch); 1986 1987 if (!kvmclock_periodic_sync) 1988 return; 1989 1990 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0); 1991 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 1992 KVMCLOCK_SYNC_PERIOD); 1993 } 1994 1995 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data) 1996 { 1997 u64 mcg_cap = vcpu->arch.mcg_cap; 1998 unsigned bank_num = mcg_cap & 0xff; 1999 2000 switch (msr) { 2001 case MSR_IA32_MCG_STATUS: 2002 vcpu->arch.mcg_status = data; 2003 break; 2004 case MSR_IA32_MCG_CTL: 2005 if (!(mcg_cap & MCG_CTL_P)) 2006 return 1; 2007 if (data != 0 && data != ~(u64)0) 2008 return -1; 2009 vcpu->arch.mcg_ctl = data; 2010 break; 2011 default: 2012 if (msr >= MSR_IA32_MC0_CTL && 2013 msr < MSR_IA32_MCx_CTL(bank_num)) { 2014 u32 offset = msr - MSR_IA32_MC0_CTL; 2015 /* only 0 or all 1s can be written to IA32_MCi_CTL 2016 * some Linux kernels though clear bit 10 in bank 4 to 2017 * workaround a BIOS/GART TBL issue on AMD K8s, ignore 2018 * this to avoid an uncatched #GP in the guest 2019 */ 2020 if ((offset & 0x3) == 0 && 2021 data != 0 && (data | (1 << 10)) != ~(u64)0) 2022 return -1; 2023 vcpu->arch.mce_banks[offset] = data; 2024 break; 2025 } 2026 return 1; 2027 } 2028 return 0; 2029 } 2030 2031 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) 2032 { 2033 struct kvm *kvm = vcpu->kvm; 2034 int lm = is_long_mode(vcpu); 2035 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 2036 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; 2037 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 2038 : kvm->arch.xen_hvm_config.blob_size_32; 2039 u32 page_num = data & ~PAGE_MASK; 2040 u64 page_addr = data & PAGE_MASK; 2041 u8 *page; 2042 int r; 2043 2044 r = -E2BIG; 2045 if (page_num >= blob_size) 2046 goto out; 2047 r = -ENOMEM; 2048 page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE); 2049 if (IS_ERR(page)) { 2050 r = PTR_ERR(page); 2051 goto out; 2052 } 2053 if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) 2054 goto out_free; 2055 r = 0; 2056 out_free: 2057 kfree(page); 2058 out: 2059 return r; 2060 } 2061 2062 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) 2063 { 2064 gpa_t gpa = data & ~0x3f; 2065 2066 /* Bits 3:5 are reserved, Should be zero */ 2067 if (data & 0x38) 2068 return 1; 2069 2070 vcpu->arch.apf.msr_val = data; 2071 2072 if (!(data & KVM_ASYNC_PF_ENABLED)) { 2073 kvm_clear_async_pf_completion_queue(vcpu); 2074 kvm_async_pf_hash_reset(vcpu); 2075 return 0; 2076 } 2077 2078 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa, 2079 sizeof(u32))) 2080 return 1; 2081 2082 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); 2083 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT; 2084 kvm_async_pf_wakeup_all(vcpu); 2085 return 0; 2086 } 2087 2088 static void kvmclock_reset(struct kvm_vcpu *vcpu) 2089 { 2090 vcpu->arch.pv_time_enabled = false; 2091 } 2092 2093 static void record_steal_time(struct kvm_vcpu *vcpu) 2094 { 2095 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 2096 return; 2097 2098 if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2099 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)))) 2100 return; 2101 2102 vcpu->arch.st.steal.preempted = 0; 2103 2104 if (vcpu->arch.st.steal.version & 1) 2105 vcpu->arch.st.steal.version += 1; /* first time write, random junk */ 2106 2107 vcpu->arch.st.steal.version += 1; 2108 2109 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2110 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2111 2112 smp_wmb(); 2113 2114 vcpu->arch.st.steal.steal += current->sched_info.run_delay - 2115 vcpu->arch.st.last_steal; 2116 vcpu->arch.st.last_steal = current->sched_info.run_delay; 2117 2118 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2119 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2120 2121 smp_wmb(); 2122 2123 vcpu->arch.st.steal.version += 1; 2124 2125 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, 2126 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); 2127 } 2128 2129 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2130 { 2131 bool pr = false; 2132 u32 msr = msr_info->index; 2133 u64 data = msr_info->data; 2134 2135 switch (msr) { 2136 case MSR_AMD64_NB_CFG: 2137 case MSR_IA32_UCODE_REV: 2138 case MSR_IA32_UCODE_WRITE: 2139 case MSR_VM_HSAVE_PA: 2140 case MSR_AMD64_PATCH_LOADER: 2141 case MSR_AMD64_BU_CFG2: 2142 case MSR_AMD64_DC_CFG: 2143 break; 2144 2145 case MSR_EFER: 2146 return set_efer(vcpu, data); 2147 case MSR_K7_HWCR: 2148 data &= ~(u64)0x40; /* ignore flush filter disable */ 2149 data &= ~(u64)0x100; /* ignore ignne emulation enable */ 2150 data &= ~(u64)0x8; /* ignore TLB cache disable */ 2151 data &= ~(u64)0x40000; /* ignore Mc status write enable */ 2152 if (data != 0) { 2153 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", 2154 data); 2155 return 1; 2156 } 2157 break; 2158 case MSR_FAM10H_MMIO_CONF_BASE: 2159 if (data != 0) { 2160 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " 2161 "0x%llx\n", data); 2162 return 1; 2163 } 2164 break; 2165 case MSR_IA32_DEBUGCTLMSR: 2166 if (!data) { 2167 /* We support the non-activated case already */ 2168 break; 2169 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { 2170 /* Values other than LBR and BTF are vendor-specific, 2171 thus reserved and should throw a #GP */ 2172 return 1; 2173 } 2174 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", 2175 __func__, data); 2176 break; 2177 case 0x200 ... 0x2ff: 2178 return kvm_mtrr_set_msr(vcpu, msr, data); 2179 case MSR_IA32_APICBASE: 2180 return kvm_set_apic_base(vcpu, msr_info); 2181 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2182 return kvm_x2apic_msr_write(vcpu, msr, data); 2183 case MSR_IA32_TSCDEADLINE: 2184 kvm_set_lapic_tscdeadline_msr(vcpu, data); 2185 break; 2186 case MSR_IA32_TSC_ADJUST: 2187 if (guest_cpuid_has_tsc_adjust(vcpu)) { 2188 if (!msr_info->host_initiated) { 2189 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr; 2190 adjust_tsc_offset_guest(vcpu, adj); 2191 } 2192 vcpu->arch.ia32_tsc_adjust_msr = data; 2193 } 2194 break; 2195 case MSR_IA32_MISC_ENABLE: 2196 vcpu->arch.ia32_misc_enable_msr = data; 2197 break; 2198 case MSR_IA32_SMBASE: 2199 if (!msr_info->host_initiated) 2200 return 1; 2201 vcpu->arch.smbase = data; 2202 break; 2203 case MSR_KVM_WALL_CLOCK_NEW: 2204 case MSR_KVM_WALL_CLOCK: 2205 vcpu->kvm->arch.wall_clock = data; 2206 kvm_write_wall_clock(vcpu->kvm, data); 2207 break; 2208 case MSR_KVM_SYSTEM_TIME_NEW: 2209 case MSR_KVM_SYSTEM_TIME: { 2210 struct kvm_arch *ka = &vcpu->kvm->arch; 2211 2212 kvmclock_reset(vcpu); 2213 2214 if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) { 2215 bool tmp = (msr == MSR_KVM_SYSTEM_TIME); 2216 2217 if (ka->boot_vcpu_runs_old_kvmclock != tmp) 2218 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 2219 2220 ka->boot_vcpu_runs_old_kvmclock = tmp; 2221 } 2222 2223 vcpu->arch.time = data; 2224 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 2225 2226 /* we verify if the enable bit is set... */ 2227 if (!(data & 1)) 2228 break; 2229 2230 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, 2231 &vcpu->arch.pv_time, data & ~1ULL, 2232 sizeof(struct pvclock_vcpu_time_info))) 2233 vcpu->arch.pv_time_enabled = false; 2234 else 2235 vcpu->arch.pv_time_enabled = true; 2236 2237 break; 2238 } 2239 case MSR_KVM_ASYNC_PF_EN: 2240 if (kvm_pv_enable_async_pf(vcpu, data)) 2241 return 1; 2242 break; 2243 case MSR_KVM_STEAL_TIME: 2244 2245 if (unlikely(!sched_info_on())) 2246 return 1; 2247 2248 if (data & KVM_STEAL_RESERVED_MASK) 2249 return 1; 2250 2251 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime, 2252 data & KVM_STEAL_VALID_BITS, 2253 sizeof(struct kvm_steal_time))) 2254 return 1; 2255 2256 vcpu->arch.st.msr_val = data; 2257 2258 if (!(data & KVM_MSR_ENABLED)) 2259 break; 2260 2261 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 2262 2263 break; 2264 case MSR_KVM_PV_EOI_EN: 2265 if (kvm_lapic_enable_pv_eoi(vcpu, data)) 2266 return 1; 2267 break; 2268 2269 case MSR_IA32_MCG_CTL: 2270 case MSR_IA32_MCG_STATUS: 2271 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 2272 return set_msr_mce(vcpu, msr, data); 2273 2274 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2275 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2276 pr = true; /* fall through */ 2277 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2278 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2279 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2280 return kvm_pmu_set_msr(vcpu, msr_info); 2281 2282 if (pr || data != 0) 2283 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: " 2284 "0x%x data 0x%llx\n", msr, data); 2285 break; 2286 case MSR_K7_CLK_CTL: 2287 /* 2288 * Ignore all writes to this no longer documented MSR. 2289 * Writes are only relevant for old K7 processors, 2290 * all pre-dating SVM, but a recommended workaround from 2291 * AMD for these chips. It is possible to specify the 2292 * affected processor models on the command line, hence 2293 * the need to ignore the workaround. 2294 */ 2295 break; 2296 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 2297 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 2298 case HV_X64_MSR_CRASH_CTL: 2299 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 2300 return kvm_hv_set_msr_common(vcpu, msr, data, 2301 msr_info->host_initiated); 2302 case MSR_IA32_BBL_CR_CTL3: 2303 /* Drop writes to this legacy MSR -- see rdmsr 2304 * counterpart for further detail. 2305 */ 2306 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", msr, data); 2307 break; 2308 case MSR_AMD64_OSVW_ID_LENGTH: 2309 if (!guest_cpuid_has_osvw(vcpu)) 2310 return 1; 2311 vcpu->arch.osvw.length = data; 2312 break; 2313 case MSR_AMD64_OSVW_STATUS: 2314 if (!guest_cpuid_has_osvw(vcpu)) 2315 return 1; 2316 vcpu->arch.osvw.status = data; 2317 break; 2318 case MSR_PLATFORM_INFO: 2319 if (!msr_info->host_initiated || 2320 data & ~MSR_PLATFORM_INFO_CPUID_FAULT || 2321 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) && 2322 cpuid_fault_enabled(vcpu))) 2323 return 1; 2324 vcpu->arch.msr_platform_info = data; 2325 break; 2326 case MSR_MISC_FEATURES_ENABLES: 2327 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT || 2328 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT && 2329 !supports_cpuid_fault(vcpu))) 2330 return 1; 2331 vcpu->arch.msr_misc_features_enables = data; 2332 break; 2333 default: 2334 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) 2335 return xen_hvm_config(vcpu, data); 2336 if (kvm_pmu_is_valid_msr(vcpu, msr)) 2337 return kvm_pmu_set_msr(vcpu, msr_info); 2338 if (!ignore_msrs) { 2339 vcpu_debug_ratelimited(vcpu, "unhandled wrmsr: 0x%x data 0x%llx\n", 2340 msr, data); 2341 return 1; 2342 } else { 2343 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", 2344 msr, data); 2345 break; 2346 } 2347 } 2348 return 0; 2349 } 2350 EXPORT_SYMBOL_GPL(kvm_set_msr_common); 2351 2352 2353 /* 2354 * Reads an msr value (of 'msr_index') into 'pdata'. 2355 * Returns 0 on success, non-0 otherwise. 2356 * Assumes vcpu_load() was already called. 2357 */ 2358 int kvm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) 2359 { 2360 return kvm_x86_ops->get_msr(vcpu, msr); 2361 } 2362 EXPORT_SYMBOL_GPL(kvm_get_msr); 2363 2364 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) 2365 { 2366 u64 data; 2367 u64 mcg_cap = vcpu->arch.mcg_cap; 2368 unsigned bank_num = mcg_cap & 0xff; 2369 2370 switch (msr) { 2371 case MSR_IA32_P5_MC_ADDR: 2372 case MSR_IA32_P5_MC_TYPE: 2373 data = 0; 2374 break; 2375 case MSR_IA32_MCG_CAP: 2376 data = vcpu->arch.mcg_cap; 2377 break; 2378 case MSR_IA32_MCG_CTL: 2379 if (!(mcg_cap & MCG_CTL_P)) 2380 return 1; 2381 data = vcpu->arch.mcg_ctl; 2382 break; 2383 case MSR_IA32_MCG_STATUS: 2384 data = vcpu->arch.mcg_status; 2385 break; 2386 default: 2387 if (msr >= MSR_IA32_MC0_CTL && 2388 msr < MSR_IA32_MCx_CTL(bank_num)) { 2389 u32 offset = msr - MSR_IA32_MC0_CTL; 2390 data = vcpu->arch.mce_banks[offset]; 2391 break; 2392 } 2393 return 1; 2394 } 2395 *pdata = data; 2396 return 0; 2397 } 2398 2399 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 2400 { 2401 switch (msr_info->index) { 2402 case MSR_IA32_PLATFORM_ID: 2403 case MSR_IA32_EBL_CR_POWERON: 2404 case MSR_IA32_DEBUGCTLMSR: 2405 case MSR_IA32_LASTBRANCHFROMIP: 2406 case MSR_IA32_LASTBRANCHTOIP: 2407 case MSR_IA32_LASTINTFROMIP: 2408 case MSR_IA32_LASTINTTOIP: 2409 case MSR_K8_SYSCFG: 2410 case MSR_K8_TSEG_ADDR: 2411 case MSR_K8_TSEG_MASK: 2412 case MSR_K7_HWCR: 2413 case MSR_VM_HSAVE_PA: 2414 case MSR_K8_INT_PENDING_MSG: 2415 case MSR_AMD64_NB_CFG: 2416 case MSR_FAM10H_MMIO_CONF_BASE: 2417 case MSR_AMD64_BU_CFG2: 2418 case MSR_IA32_PERF_CTL: 2419 case MSR_AMD64_DC_CFG: 2420 msr_info->data = 0; 2421 break; 2422 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3: 2423 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3: 2424 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1: 2425 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1: 2426 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 2427 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 2428 msr_info->data = 0; 2429 break; 2430 case MSR_IA32_UCODE_REV: 2431 msr_info->data = 0x100000000ULL; 2432 break; 2433 case MSR_MTRRcap: 2434 case 0x200 ... 0x2ff: 2435 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data); 2436 case 0xcd: /* fsb frequency */ 2437 msr_info->data = 3; 2438 break; 2439 /* 2440 * MSR_EBC_FREQUENCY_ID 2441 * Conservative value valid for even the basic CPU models. 2442 * Models 0,1: 000 in bits 23:21 indicating a bus speed of 2443 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, 2444 * and 266MHz for model 3, or 4. Set Core Clock 2445 * Frequency to System Bus Frequency Ratio to 1 (bits 2446 * 31:24) even though these are only valid for CPU 2447 * models > 2, however guests may end up dividing or 2448 * multiplying by zero otherwise. 2449 */ 2450 case MSR_EBC_FREQUENCY_ID: 2451 msr_info->data = 1 << 24; 2452 break; 2453 case MSR_IA32_APICBASE: 2454 msr_info->data = kvm_get_apic_base(vcpu); 2455 break; 2456 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: 2457 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data); 2458 break; 2459 case MSR_IA32_TSCDEADLINE: 2460 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu); 2461 break; 2462 case MSR_IA32_TSC_ADJUST: 2463 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr; 2464 break; 2465 case MSR_IA32_MISC_ENABLE: 2466 msr_info->data = vcpu->arch.ia32_misc_enable_msr; 2467 break; 2468 case MSR_IA32_SMBASE: 2469 if (!msr_info->host_initiated) 2470 return 1; 2471 msr_info->data = vcpu->arch.smbase; 2472 break; 2473 case MSR_IA32_PERF_STATUS: 2474 /* TSC increment by tick */ 2475 msr_info->data = 1000ULL; 2476 /* CPU multiplier */ 2477 msr_info->data |= (((uint64_t)4ULL) << 40); 2478 break; 2479 case MSR_EFER: 2480 msr_info->data = vcpu->arch.efer; 2481 break; 2482 case MSR_KVM_WALL_CLOCK: 2483 case MSR_KVM_WALL_CLOCK_NEW: 2484 msr_info->data = vcpu->kvm->arch.wall_clock; 2485 break; 2486 case MSR_KVM_SYSTEM_TIME: 2487 case MSR_KVM_SYSTEM_TIME_NEW: 2488 msr_info->data = vcpu->arch.time; 2489 break; 2490 case MSR_KVM_ASYNC_PF_EN: 2491 msr_info->data = vcpu->arch.apf.msr_val; 2492 break; 2493 case MSR_KVM_STEAL_TIME: 2494 msr_info->data = vcpu->arch.st.msr_val; 2495 break; 2496 case MSR_KVM_PV_EOI_EN: 2497 msr_info->data = vcpu->arch.pv_eoi.msr_val; 2498 break; 2499 case MSR_IA32_P5_MC_ADDR: 2500 case MSR_IA32_P5_MC_TYPE: 2501 case MSR_IA32_MCG_CAP: 2502 case MSR_IA32_MCG_CTL: 2503 case MSR_IA32_MCG_STATUS: 2504 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: 2505 return get_msr_mce(vcpu, msr_info->index, &msr_info->data); 2506 case MSR_K7_CLK_CTL: 2507 /* 2508 * Provide expected ramp-up count for K7. All other 2509 * are set to zero, indicating minimum divisors for 2510 * every field. 2511 * 2512 * This prevents guest kernels on AMD host with CPU 2513 * type 6, model 8 and higher from exploding due to 2514 * the rdmsr failing. 2515 */ 2516 msr_info->data = 0x20000000; 2517 break; 2518 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: 2519 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 2520 case HV_X64_MSR_CRASH_CTL: 2521 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT: 2522 return kvm_hv_get_msr_common(vcpu, 2523 msr_info->index, &msr_info->data); 2524 break; 2525 case MSR_IA32_BBL_CR_CTL3: 2526 /* This legacy MSR exists but isn't fully documented in current 2527 * silicon. It is however accessed by winxp in very narrow 2528 * scenarios where it sets bit #19, itself documented as 2529 * a "reserved" bit. Best effort attempt to source coherent 2530 * read data here should the balance of the register be 2531 * interpreted by the guest: 2532 * 2533 * L2 cache control register 3: 64GB range, 256KB size, 2534 * enabled, latency 0x1, configured 2535 */ 2536 msr_info->data = 0xbe702111; 2537 break; 2538 case MSR_AMD64_OSVW_ID_LENGTH: 2539 if (!guest_cpuid_has_osvw(vcpu)) 2540 return 1; 2541 msr_info->data = vcpu->arch.osvw.length; 2542 break; 2543 case MSR_AMD64_OSVW_STATUS: 2544 if (!guest_cpuid_has_osvw(vcpu)) 2545 return 1; 2546 msr_info->data = vcpu->arch.osvw.status; 2547 break; 2548 case MSR_PLATFORM_INFO: 2549 msr_info->data = vcpu->arch.msr_platform_info; 2550 break; 2551 case MSR_MISC_FEATURES_ENABLES: 2552 msr_info->data = vcpu->arch.msr_misc_features_enables; 2553 break; 2554 default: 2555 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) 2556 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data); 2557 if (!ignore_msrs) { 2558 vcpu_debug_ratelimited(vcpu, "unhandled rdmsr: 0x%x\n", 2559 msr_info->index); 2560 return 1; 2561 } else { 2562 vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr_info->index); 2563 msr_info->data = 0; 2564 } 2565 break; 2566 } 2567 return 0; 2568 } 2569 EXPORT_SYMBOL_GPL(kvm_get_msr_common); 2570 2571 /* 2572 * Read or write a bunch of msrs. All parameters are kernel addresses. 2573 * 2574 * @return number of msrs set successfully. 2575 */ 2576 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, 2577 struct kvm_msr_entry *entries, 2578 int (*do_msr)(struct kvm_vcpu *vcpu, 2579 unsigned index, u64 *data)) 2580 { 2581 int i, idx; 2582 2583 idx = srcu_read_lock(&vcpu->kvm->srcu); 2584 for (i = 0; i < msrs->nmsrs; ++i) 2585 if (do_msr(vcpu, entries[i].index, &entries[i].data)) 2586 break; 2587 srcu_read_unlock(&vcpu->kvm->srcu, idx); 2588 2589 return i; 2590 } 2591 2592 /* 2593 * Read or write a bunch of msrs. Parameters are user addresses. 2594 * 2595 * @return number of msrs set successfully. 2596 */ 2597 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, 2598 int (*do_msr)(struct kvm_vcpu *vcpu, 2599 unsigned index, u64 *data), 2600 int writeback) 2601 { 2602 struct kvm_msrs msrs; 2603 struct kvm_msr_entry *entries; 2604 int r, n; 2605 unsigned size; 2606 2607 r = -EFAULT; 2608 if (copy_from_user(&msrs, user_msrs, sizeof msrs)) 2609 goto out; 2610 2611 r = -E2BIG; 2612 if (msrs.nmsrs >= MAX_IO_MSRS) 2613 goto out; 2614 2615 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; 2616 entries = memdup_user(user_msrs->entries, size); 2617 if (IS_ERR(entries)) { 2618 r = PTR_ERR(entries); 2619 goto out; 2620 } 2621 2622 r = n = __msr_io(vcpu, &msrs, entries, do_msr); 2623 if (r < 0) 2624 goto out_free; 2625 2626 r = -EFAULT; 2627 if (writeback && copy_to_user(user_msrs->entries, entries, size)) 2628 goto out_free; 2629 2630 r = n; 2631 2632 out_free: 2633 kfree(entries); 2634 out: 2635 return r; 2636 } 2637 2638 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 2639 { 2640 int r; 2641 2642 switch (ext) { 2643 case KVM_CAP_IRQCHIP: 2644 case KVM_CAP_HLT: 2645 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: 2646 case KVM_CAP_SET_TSS_ADDR: 2647 case KVM_CAP_EXT_CPUID: 2648 case KVM_CAP_EXT_EMUL_CPUID: 2649 case KVM_CAP_CLOCKSOURCE: 2650 case KVM_CAP_PIT: 2651 case KVM_CAP_NOP_IO_DELAY: 2652 case KVM_CAP_MP_STATE: 2653 case KVM_CAP_SYNC_MMU: 2654 case KVM_CAP_USER_NMI: 2655 case KVM_CAP_REINJECT_CONTROL: 2656 case KVM_CAP_IRQ_INJECT_STATUS: 2657 case KVM_CAP_IOEVENTFD: 2658 case KVM_CAP_IOEVENTFD_NO_LENGTH: 2659 case KVM_CAP_PIT2: 2660 case KVM_CAP_PIT_STATE2: 2661 case KVM_CAP_SET_IDENTITY_MAP_ADDR: 2662 case KVM_CAP_XEN_HVM: 2663 case KVM_CAP_VCPU_EVENTS: 2664 case KVM_CAP_HYPERV: 2665 case KVM_CAP_HYPERV_VAPIC: 2666 case KVM_CAP_HYPERV_SPIN: 2667 case KVM_CAP_HYPERV_SYNIC: 2668 case KVM_CAP_HYPERV_SYNIC2: 2669 case KVM_CAP_HYPERV_VP_INDEX: 2670 case KVM_CAP_PCI_SEGMENT: 2671 case KVM_CAP_DEBUGREGS: 2672 case KVM_CAP_X86_ROBUST_SINGLESTEP: 2673 case KVM_CAP_XSAVE: 2674 case KVM_CAP_ASYNC_PF: 2675 case KVM_CAP_GET_TSC_KHZ: 2676 case KVM_CAP_KVMCLOCK_CTRL: 2677 case KVM_CAP_READONLY_MEM: 2678 case KVM_CAP_HYPERV_TIME: 2679 case KVM_CAP_IOAPIC_POLARITY_IGNORED: 2680 case KVM_CAP_TSC_DEADLINE_TIMER: 2681 case KVM_CAP_ENABLE_CAP_VM: 2682 case KVM_CAP_DISABLE_QUIRKS: 2683 case KVM_CAP_SET_BOOT_CPU_ID: 2684 case KVM_CAP_SPLIT_IRQCHIP: 2685 case KVM_CAP_IMMEDIATE_EXIT: 2686 r = 1; 2687 break; 2688 case KVM_CAP_ADJUST_CLOCK: 2689 r = KVM_CLOCK_TSC_STABLE; 2690 break; 2691 case KVM_CAP_X86_GUEST_MWAIT: 2692 r = kvm_mwait_in_guest(); 2693 break; 2694 case KVM_CAP_X86_SMM: 2695 /* SMBASE is usually relocated above 1M on modern chipsets, 2696 * and SMM handlers might indeed rely on 4G segment limits, 2697 * so do not report SMM to be available if real mode is 2698 * emulated via vm86 mode. Still, do not go to great lengths 2699 * to avoid userspace's usage of the feature, because it is a 2700 * fringe case that is not enabled except via specific settings 2701 * of the module parameters. 2702 */ 2703 r = kvm_x86_ops->cpu_has_high_real_mode_segbase(); 2704 break; 2705 case KVM_CAP_VAPIC: 2706 r = !kvm_x86_ops->cpu_has_accelerated_tpr(); 2707 break; 2708 case KVM_CAP_NR_VCPUS: 2709 r = KVM_SOFT_MAX_VCPUS; 2710 break; 2711 case KVM_CAP_MAX_VCPUS: 2712 r = KVM_MAX_VCPUS; 2713 break; 2714 case KVM_CAP_NR_MEMSLOTS: 2715 r = KVM_USER_MEM_SLOTS; 2716 break; 2717 case KVM_CAP_PV_MMU: /* obsolete */ 2718 r = 0; 2719 break; 2720 case KVM_CAP_MCE: 2721 r = KVM_MAX_MCE_BANKS; 2722 break; 2723 case KVM_CAP_XCRS: 2724 r = boot_cpu_has(X86_FEATURE_XSAVE); 2725 break; 2726 case KVM_CAP_TSC_CONTROL: 2727 r = kvm_has_tsc_control; 2728 break; 2729 case KVM_CAP_X2APIC_API: 2730 r = KVM_X2APIC_API_VALID_FLAGS; 2731 break; 2732 default: 2733 r = 0; 2734 break; 2735 } 2736 return r; 2737 2738 } 2739 2740 long kvm_arch_dev_ioctl(struct file *filp, 2741 unsigned int ioctl, unsigned long arg) 2742 { 2743 void __user *argp = (void __user *)arg; 2744 long r; 2745 2746 switch (ioctl) { 2747 case KVM_GET_MSR_INDEX_LIST: { 2748 struct kvm_msr_list __user *user_msr_list = argp; 2749 struct kvm_msr_list msr_list; 2750 unsigned n; 2751 2752 r = -EFAULT; 2753 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) 2754 goto out; 2755 n = msr_list.nmsrs; 2756 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs; 2757 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) 2758 goto out; 2759 r = -E2BIG; 2760 if (n < msr_list.nmsrs) 2761 goto out; 2762 r = -EFAULT; 2763 if (copy_to_user(user_msr_list->indices, &msrs_to_save, 2764 num_msrs_to_save * sizeof(u32))) 2765 goto out; 2766 if (copy_to_user(user_msr_list->indices + num_msrs_to_save, 2767 &emulated_msrs, 2768 num_emulated_msrs * sizeof(u32))) 2769 goto out; 2770 r = 0; 2771 break; 2772 } 2773 case KVM_GET_SUPPORTED_CPUID: 2774 case KVM_GET_EMULATED_CPUID: { 2775 struct kvm_cpuid2 __user *cpuid_arg = argp; 2776 struct kvm_cpuid2 cpuid; 2777 2778 r = -EFAULT; 2779 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 2780 goto out; 2781 2782 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries, 2783 ioctl); 2784 if (r) 2785 goto out; 2786 2787 r = -EFAULT; 2788 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) 2789 goto out; 2790 r = 0; 2791 break; 2792 } 2793 case KVM_X86_GET_MCE_CAP_SUPPORTED: { 2794 r = -EFAULT; 2795 if (copy_to_user(argp, &kvm_mce_cap_supported, 2796 sizeof(kvm_mce_cap_supported))) 2797 goto out; 2798 r = 0; 2799 break; 2800 } 2801 default: 2802 r = -EINVAL; 2803 } 2804 out: 2805 return r; 2806 } 2807 2808 static void wbinvd_ipi(void *garbage) 2809 { 2810 wbinvd(); 2811 } 2812 2813 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) 2814 { 2815 return kvm_arch_has_noncoherent_dma(vcpu->kvm); 2816 } 2817 2818 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 2819 { 2820 /* Address WBINVD may be executed by guest */ 2821 if (need_emulate_wbinvd(vcpu)) { 2822 if (kvm_x86_ops->has_wbinvd_exit()) 2823 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 2824 else if (vcpu->cpu != -1 && vcpu->cpu != cpu) 2825 smp_call_function_single(vcpu->cpu, 2826 wbinvd_ipi, NULL, 1); 2827 } 2828 2829 kvm_x86_ops->vcpu_load(vcpu, cpu); 2830 2831 /* Apply any externally detected TSC adjustments (due to suspend) */ 2832 if (unlikely(vcpu->arch.tsc_offset_adjustment)) { 2833 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment); 2834 vcpu->arch.tsc_offset_adjustment = 0; 2835 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 2836 } 2837 2838 if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) { 2839 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 : 2840 rdtsc() - vcpu->arch.last_host_tsc; 2841 if (tsc_delta < 0) 2842 mark_tsc_unstable("KVM discovered backwards TSC"); 2843 2844 if (check_tsc_unstable()) { 2845 u64 offset = kvm_compute_tsc_offset(vcpu, 2846 vcpu->arch.last_guest_tsc); 2847 kvm_vcpu_write_tsc_offset(vcpu, offset); 2848 vcpu->arch.tsc_catchup = 1; 2849 } 2850 2851 if (kvm_lapic_hv_timer_in_use(vcpu)) 2852 kvm_lapic_restart_hv_timer(vcpu); 2853 2854 /* 2855 * On a host with synchronized TSC, there is no need to update 2856 * kvmclock on vcpu->cpu migration 2857 */ 2858 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1) 2859 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); 2860 if (vcpu->cpu != cpu) 2861 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu); 2862 vcpu->cpu = cpu; 2863 } 2864 2865 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); 2866 } 2867 2868 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) 2869 { 2870 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) 2871 return; 2872 2873 vcpu->arch.st.steal.preempted = 1; 2874 2875 kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime, 2876 &vcpu->arch.st.steal.preempted, 2877 offsetof(struct kvm_steal_time, preempted), 2878 sizeof(vcpu->arch.st.steal.preempted)); 2879 } 2880 2881 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 2882 { 2883 int idx; 2884 /* 2885 * Disable page faults because we're in atomic context here. 2886 * kvm_write_guest_offset_cached() would call might_fault() 2887 * that relies on pagefault_disable() to tell if there's a 2888 * bug. NOTE: the write to guest memory may not go through if 2889 * during postcopy live migration or if there's heavy guest 2890 * paging. 2891 */ 2892 pagefault_disable(); 2893 /* 2894 * kvm_memslots() will be called by 2895 * kvm_write_guest_offset_cached() so take the srcu lock. 2896 */ 2897 idx = srcu_read_lock(&vcpu->kvm->srcu); 2898 kvm_steal_time_set_preempted(vcpu); 2899 srcu_read_unlock(&vcpu->kvm->srcu, idx); 2900 pagefault_enable(); 2901 kvm_x86_ops->vcpu_put(vcpu); 2902 kvm_put_guest_fpu(vcpu); 2903 vcpu->arch.last_host_tsc = rdtsc(); 2904 } 2905 2906 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, 2907 struct kvm_lapic_state *s) 2908 { 2909 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active) 2910 kvm_x86_ops->sync_pir_to_irr(vcpu); 2911 2912 return kvm_apic_get_state(vcpu, s); 2913 } 2914 2915 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, 2916 struct kvm_lapic_state *s) 2917 { 2918 int r; 2919 2920 r = kvm_apic_set_state(vcpu, s); 2921 if (r) 2922 return r; 2923 update_cr8_intercept(vcpu); 2924 2925 return 0; 2926 } 2927 2928 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu) 2929 { 2930 return (!lapic_in_kernel(vcpu) || 2931 kvm_apic_accept_pic_intr(vcpu)); 2932 } 2933 2934 /* 2935 * if userspace requested an interrupt window, check that the 2936 * interrupt window is open. 2937 * 2938 * No need to exit to userspace if we already have an interrupt queued. 2939 */ 2940 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu) 2941 { 2942 return kvm_arch_interrupt_allowed(vcpu) && 2943 !kvm_cpu_has_interrupt(vcpu) && 2944 !kvm_event_needs_reinjection(vcpu) && 2945 kvm_cpu_accept_dm_intr(vcpu); 2946 } 2947 2948 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, 2949 struct kvm_interrupt *irq) 2950 { 2951 if (irq->irq >= KVM_NR_INTERRUPTS) 2952 return -EINVAL; 2953 2954 if (!irqchip_in_kernel(vcpu->kvm)) { 2955 kvm_queue_interrupt(vcpu, irq->irq, false); 2956 kvm_make_request(KVM_REQ_EVENT, vcpu); 2957 return 0; 2958 } 2959 2960 /* 2961 * With in-kernel LAPIC, we only use this to inject EXTINT, so 2962 * fail for in-kernel 8259. 2963 */ 2964 if (pic_in_kernel(vcpu->kvm)) 2965 return -ENXIO; 2966 2967 if (vcpu->arch.pending_external_vector != -1) 2968 return -EEXIST; 2969 2970 vcpu->arch.pending_external_vector = irq->irq; 2971 kvm_make_request(KVM_REQ_EVENT, vcpu); 2972 return 0; 2973 } 2974 2975 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) 2976 { 2977 kvm_inject_nmi(vcpu); 2978 2979 return 0; 2980 } 2981 2982 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu) 2983 { 2984 kvm_make_request(KVM_REQ_SMI, vcpu); 2985 2986 return 0; 2987 } 2988 2989 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, 2990 struct kvm_tpr_access_ctl *tac) 2991 { 2992 if (tac->flags) 2993 return -EINVAL; 2994 vcpu->arch.tpr_access_reporting = !!tac->enabled; 2995 return 0; 2996 } 2997 2998 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, 2999 u64 mcg_cap) 3000 { 3001 int r; 3002 unsigned bank_num = mcg_cap & 0xff, bank; 3003 3004 r = -EINVAL; 3005 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) 3006 goto out; 3007 if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000)) 3008 goto out; 3009 r = 0; 3010 vcpu->arch.mcg_cap = mcg_cap; 3011 /* Init IA32_MCG_CTL to all 1s */ 3012 if (mcg_cap & MCG_CTL_P) 3013 vcpu->arch.mcg_ctl = ~(u64)0; 3014 /* Init IA32_MCi_CTL to all 1s */ 3015 for (bank = 0; bank < bank_num; bank++) 3016 vcpu->arch.mce_banks[bank*4] = ~(u64)0; 3017 3018 if (kvm_x86_ops->setup_mce) 3019 kvm_x86_ops->setup_mce(vcpu); 3020 out: 3021 return r; 3022 } 3023 3024 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, 3025 struct kvm_x86_mce *mce) 3026 { 3027 u64 mcg_cap = vcpu->arch.mcg_cap; 3028 unsigned bank_num = mcg_cap & 0xff; 3029 u64 *banks = vcpu->arch.mce_banks; 3030 3031 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) 3032 return -EINVAL; 3033 /* 3034 * if IA32_MCG_CTL is not all 1s, the uncorrected error 3035 * reporting is disabled 3036 */ 3037 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && 3038 vcpu->arch.mcg_ctl != ~(u64)0) 3039 return 0; 3040 banks += 4 * mce->bank; 3041 /* 3042 * if IA32_MCi_CTL is not all 1s, the uncorrected error 3043 * reporting is disabled for the bank 3044 */ 3045 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) 3046 return 0; 3047 if (mce->status & MCI_STATUS_UC) { 3048 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || 3049 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { 3050 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); 3051 return 0; 3052 } 3053 if (banks[1] & MCI_STATUS_VAL) 3054 mce->status |= MCI_STATUS_OVER; 3055 banks[2] = mce->addr; 3056 banks[3] = mce->misc; 3057 vcpu->arch.mcg_status = mce->mcg_status; 3058 banks[1] = mce->status; 3059 kvm_queue_exception(vcpu, MC_VECTOR); 3060 } else if (!(banks[1] & MCI_STATUS_VAL) 3061 || !(banks[1] & MCI_STATUS_UC)) { 3062 if (banks[1] & MCI_STATUS_VAL) 3063 mce->status |= MCI_STATUS_OVER; 3064 banks[2] = mce->addr; 3065 banks[3] = mce->misc; 3066 banks[1] = mce->status; 3067 } else 3068 banks[1] |= MCI_STATUS_OVER; 3069 return 0; 3070 } 3071 3072 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, 3073 struct kvm_vcpu_events *events) 3074 { 3075 process_nmi(vcpu); 3076 events->exception.injected = 3077 vcpu->arch.exception.pending && 3078 !kvm_exception_is_soft(vcpu->arch.exception.nr); 3079 events->exception.nr = vcpu->arch.exception.nr; 3080 events->exception.has_error_code = vcpu->arch.exception.has_error_code; 3081 events->exception.pad = 0; 3082 events->exception.error_code = vcpu->arch.exception.error_code; 3083 3084 events->interrupt.injected = 3085 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft; 3086 events->interrupt.nr = vcpu->arch.interrupt.nr; 3087 events->interrupt.soft = 0; 3088 events->interrupt.shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 3089 3090 events->nmi.injected = vcpu->arch.nmi_injected; 3091 events->nmi.pending = vcpu->arch.nmi_pending != 0; 3092 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); 3093 events->nmi.pad = 0; 3094 3095 events->sipi_vector = 0; /* never valid when reporting to user space */ 3096 3097 events->smi.smm = is_smm(vcpu); 3098 events->smi.pending = vcpu->arch.smi_pending; 3099 events->smi.smm_inside_nmi = 3100 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK); 3101 events->smi.latched_init = kvm_lapic_latched_init(vcpu); 3102 3103 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING 3104 | KVM_VCPUEVENT_VALID_SHADOW 3105 | KVM_VCPUEVENT_VALID_SMM); 3106 memset(&events->reserved, 0, sizeof(events->reserved)); 3107 } 3108 3109 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags); 3110 3111 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, 3112 struct kvm_vcpu_events *events) 3113 { 3114 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING 3115 | KVM_VCPUEVENT_VALID_SIPI_VECTOR 3116 | KVM_VCPUEVENT_VALID_SHADOW 3117 | KVM_VCPUEVENT_VALID_SMM)) 3118 return -EINVAL; 3119 3120 if (events->exception.injected && 3121 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR || 3122 is_guest_mode(vcpu))) 3123 return -EINVAL; 3124 3125 /* INITs are latched while in SMM */ 3126 if (events->flags & KVM_VCPUEVENT_VALID_SMM && 3127 (events->smi.smm || events->smi.pending) && 3128 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) 3129 return -EINVAL; 3130 3131 process_nmi(vcpu); 3132 vcpu->arch.exception.pending = events->exception.injected; 3133 vcpu->arch.exception.nr = events->exception.nr; 3134 vcpu->arch.exception.has_error_code = events->exception.has_error_code; 3135 vcpu->arch.exception.error_code = events->exception.error_code; 3136 3137 vcpu->arch.interrupt.pending = events->interrupt.injected; 3138 vcpu->arch.interrupt.nr = events->interrupt.nr; 3139 vcpu->arch.interrupt.soft = events->interrupt.soft; 3140 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) 3141 kvm_x86_ops->set_interrupt_shadow(vcpu, 3142 events->interrupt.shadow); 3143 3144 vcpu->arch.nmi_injected = events->nmi.injected; 3145 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) 3146 vcpu->arch.nmi_pending = events->nmi.pending; 3147 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); 3148 3149 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR && 3150 lapic_in_kernel(vcpu)) 3151 vcpu->arch.apic->sipi_vector = events->sipi_vector; 3152 3153 if (events->flags & KVM_VCPUEVENT_VALID_SMM) { 3154 u32 hflags = vcpu->arch.hflags; 3155 if (events->smi.smm) 3156 hflags |= HF_SMM_MASK; 3157 else 3158 hflags &= ~HF_SMM_MASK; 3159 kvm_set_hflags(vcpu, hflags); 3160 3161 vcpu->arch.smi_pending = events->smi.pending; 3162 3163 if (events->smi.smm) { 3164 if (events->smi.smm_inside_nmi) 3165 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 3166 else 3167 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; 3168 if (lapic_in_kernel(vcpu)) { 3169 if (events->smi.latched_init) 3170 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3171 else 3172 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); 3173 } 3174 } 3175 } 3176 3177 kvm_make_request(KVM_REQ_EVENT, vcpu); 3178 3179 return 0; 3180 } 3181 3182 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, 3183 struct kvm_debugregs *dbgregs) 3184 { 3185 unsigned long val; 3186 3187 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); 3188 kvm_get_dr(vcpu, 6, &val); 3189 dbgregs->dr6 = val; 3190 dbgregs->dr7 = vcpu->arch.dr7; 3191 dbgregs->flags = 0; 3192 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); 3193 } 3194 3195 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, 3196 struct kvm_debugregs *dbgregs) 3197 { 3198 if (dbgregs->flags) 3199 return -EINVAL; 3200 3201 if (dbgregs->dr6 & ~0xffffffffull) 3202 return -EINVAL; 3203 if (dbgregs->dr7 & ~0xffffffffull) 3204 return -EINVAL; 3205 3206 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); 3207 kvm_update_dr0123(vcpu); 3208 vcpu->arch.dr6 = dbgregs->dr6; 3209 kvm_update_dr6(vcpu); 3210 vcpu->arch.dr7 = dbgregs->dr7; 3211 kvm_update_dr7(vcpu); 3212 3213 return 0; 3214 } 3215 3216 #define XSTATE_COMPACTION_ENABLED (1ULL << 63) 3217 3218 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) 3219 { 3220 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; 3221 u64 xstate_bv = xsave->header.xfeatures; 3222 u64 valid; 3223 3224 /* 3225 * Copy legacy XSAVE area, to avoid complications with CPUID 3226 * leaves 0 and 1 in the loop below. 3227 */ 3228 memcpy(dest, xsave, XSAVE_HDR_OFFSET); 3229 3230 /* Set XSTATE_BV */ 3231 xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE; 3232 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv; 3233 3234 /* 3235 * Copy each region from the possibly compacted offset to the 3236 * non-compacted offset. 3237 */ 3238 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3239 while (valid) { 3240 u64 feature = valid & -valid; 3241 int index = fls64(feature) - 1; 3242 void *src = get_xsave_addr(xsave, feature); 3243 3244 if (src) { 3245 u32 size, offset, ecx, edx; 3246 cpuid_count(XSTATE_CPUID, index, 3247 &size, &offset, &ecx, &edx); 3248 if (feature == XFEATURE_MASK_PKRU) 3249 memcpy(dest + offset, &vcpu->arch.pkru, 3250 sizeof(vcpu->arch.pkru)); 3251 else 3252 memcpy(dest + offset, src, size); 3253 3254 } 3255 3256 valid -= feature; 3257 } 3258 } 3259 3260 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src) 3261 { 3262 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; 3263 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET); 3264 u64 valid; 3265 3266 /* 3267 * Copy legacy XSAVE area, to avoid complications with CPUID 3268 * leaves 0 and 1 in the loop below. 3269 */ 3270 memcpy(xsave, src, XSAVE_HDR_OFFSET); 3271 3272 /* Set XSTATE_BV and possibly XCOMP_BV. */ 3273 xsave->header.xfeatures = xstate_bv; 3274 if (boot_cpu_has(X86_FEATURE_XSAVES)) 3275 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED; 3276 3277 /* 3278 * Copy each region from the non-compacted offset to the 3279 * possibly compacted offset. 3280 */ 3281 valid = xstate_bv & ~XFEATURE_MASK_FPSSE; 3282 while (valid) { 3283 u64 feature = valid & -valid; 3284 int index = fls64(feature) - 1; 3285 void *dest = get_xsave_addr(xsave, feature); 3286 3287 if (dest) { 3288 u32 size, offset, ecx, edx; 3289 cpuid_count(XSTATE_CPUID, index, 3290 &size, &offset, &ecx, &edx); 3291 if (feature == XFEATURE_MASK_PKRU) 3292 memcpy(&vcpu->arch.pkru, src + offset, 3293 sizeof(vcpu->arch.pkru)); 3294 else 3295 memcpy(dest, src + offset, size); 3296 } 3297 3298 valid -= feature; 3299 } 3300 } 3301 3302 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, 3303 struct kvm_xsave *guest_xsave) 3304 { 3305 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3306 memset(guest_xsave, 0, sizeof(struct kvm_xsave)); 3307 fill_xsave((u8 *) guest_xsave->region, vcpu); 3308 } else { 3309 memcpy(guest_xsave->region, 3310 &vcpu->arch.guest_fpu.state.fxsave, 3311 sizeof(struct fxregs_state)); 3312 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = 3313 XFEATURE_MASK_FPSSE; 3314 } 3315 } 3316 3317 #define XSAVE_MXCSR_OFFSET 24 3318 3319 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, 3320 struct kvm_xsave *guest_xsave) 3321 { 3322 u64 xstate_bv = 3323 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; 3324 u32 mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)]; 3325 3326 if (boot_cpu_has(X86_FEATURE_XSAVE)) { 3327 /* 3328 * Here we allow setting states that are not present in 3329 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility 3330 * with old userspace. 3331 */ 3332 if (xstate_bv & ~kvm_supported_xcr0() || 3333 mxcsr & ~mxcsr_feature_mask) 3334 return -EINVAL; 3335 load_xsave(vcpu, (u8 *)guest_xsave->region); 3336 } else { 3337 if (xstate_bv & ~XFEATURE_MASK_FPSSE || 3338 mxcsr & ~mxcsr_feature_mask) 3339 return -EINVAL; 3340 memcpy(&vcpu->arch.guest_fpu.state.fxsave, 3341 guest_xsave->region, sizeof(struct fxregs_state)); 3342 } 3343 return 0; 3344 } 3345 3346 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, 3347 struct kvm_xcrs *guest_xcrs) 3348 { 3349 if (!boot_cpu_has(X86_FEATURE_XSAVE)) { 3350 guest_xcrs->nr_xcrs = 0; 3351 return; 3352 } 3353 3354 guest_xcrs->nr_xcrs = 1; 3355 guest_xcrs->flags = 0; 3356 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK; 3357 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0; 3358 } 3359 3360 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, 3361 struct kvm_xcrs *guest_xcrs) 3362 { 3363 int i, r = 0; 3364 3365 if (!boot_cpu_has(X86_FEATURE_XSAVE)) 3366 return -EINVAL; 3367 3368 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags) 3369 return -EINVAL; 3370 3371 for (i = 0; i < guest_xcrs->nr_xcrs; i++) 3372 /* Only support XCR0 currently */ 3373 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) { 3374 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK, 3375 guest_xcrs->xcrs[i].value); 3376 break; 3377 } 3378 if (r) 3379 r = -EINVAL; 3380 return r; 3381 } 3382 3383 /* 3384 * kvm_set_guest_paused() indicates to the guest kernel that it has been 3385 * stopped by the hypervisor. This function will be called from the host only. 3386 * EINVAL is returned when the host attempts to set the flag for a guest that 3387 * does not support pv clocks. 3388 */ 3389 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) 3390 { 3391 if (!vcpu->arch.pv_time_enabled) 3392 return -EINVAL; 3393 vcpu->arch.pvclock_set_guest_stopped_request = true; 3394 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 3395 return 0; 3396 } 3397 3398 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 3399 struct kvm_enable_cap *cap) 3400 { 3401 if (cap->flags) 3402 return -EINVAL; 3403 3404 switch (cap->cap) { 3405 case KVM_CAP_HYPERV_SYNIC2: 3406 if (cap->args[0]) 3407 return -EINVAL; 3408 case KVM_CAP_HYPERV_SYNIC: 3409 if (!irqchip_in_kernel(vcpu->kvm)) 3410 return -EINVAL; 3411 return kvm_hv_activate_synic(vcpu, cap->cap == 3412 KVM_CAP_HYPERV_SYNIC2); 3413 default: 3414 return -EINVAL; 3415 } 3416 } 3417 3418 long kvm_arch_vcpu_ioctl(struct file *filp, 3419 unsigned int ioctl, unsigned long arg) 3420 { 3421 struct kvm_vcpu *vcpu = filp->private_data; 3422 void __user *argp = (void __user *)arg; 3423 int r; 3424 union { 3425 struct kvm_lapic_state *lapic; 3426 struct kvm_xsave *xsave; 3427 struct kvm_xcrs *xcrs; 3428 void *buffer; 3429 } u; 3430 3431 u.buffer = NULL; 3432 switch (ioctl) { 3433 case KVM_GET_LAPIC: { 3434 r = -EINVAL; 3435 if (!lapic_in_kernel(vcpu)) 3436 goto out; 3437 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); 3438 3439 r = -ENOMEM; 3440 if (!u.lapic) 3441 goto out; 3442 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic); 3443 if (r) 3444 goto out; 3445 r = -EFAULT; 3446 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state))) 3447 goto out; 3448 r = 0; 3449 break; 3450 } 3451 case KVM_SET_LAPIC: { 3452 r = -EINVAL; 3453 if (!lapic_in_kernel(vcpu)) 3454 goto out; 3455 u.lapic = memdup_user(argp, sizeof(*u.lapic)); 3456 if (IS_ERR(u.lapic)) 3457 return PTR_ERR(u.lapic); 3458 3459 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic); 3460 break; 3461 } 3462 case KVM_INTERRUPT: { 3463 struct kvm_interrupt irq; 3464 3465 r = -EFAULT; 3466 if (copy_from_user(&irq, argp, sizeof irq)) 3467 goto out; 3468 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 3469 break; 3470 } 3471 case KVM_NMI: { 3472 r = kvm_vcpu_ioctl_nmi(vcpu); 3473 break; 3474 } 3475 case KVM_SMI: { 3476 r = kvm_vcpu_ioctl_smi(vcpu); 3477 break; 3478 } 3479 case KVM_SET_CPUID: { 3480 struct kvm_cpuid __user *cpuid_arg = argp; 3481 struct kvm_cpuid cpuid; 3482 3483 r = -EFAULT; 3484 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3485 goto out; 3486 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); 3487 break; 3488 } 3489 case KVM_SET_CPUID2: { 3490 struct kvm_cpuid2 __user *cpuid_arg = argp; 3491 struct kvm_cpuid2 cpuid; 3492 3493 r = -EFAULT; 3494 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3495 goto out; 3496 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, 3497 cpuid_arg->entries); 3498 break; 3499 } 3500 case KVM_GET_CPUID2: { 3501 struct kvm_cpuid2 __user *cpuid_arg = argp; 3502 struct kvm_cpuid2 cpuid; 3503 3504 r = -EFAULT; 3505 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) 3506 goto out; 3507 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, 3508 cpuid_arg->entries); 3509 if (r) 3510 goto out; 3511 r = -EFAULT; 3512 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) 3513 goto out; 3514 r = 0; 3515 break; 3516 } 3517 case KVM_GET_MSRS: 3518 r = msr_io(vcpu, argp, do_get_msr, 1); 3519 break; 3520 case KVM_SET_MSRS: 3521 r = msr_io(vcpu, argp, do_set_msr, 0); 3522 break; 3523 case KVM_TPR_ACCESS_REPORTING: { 3524 struct kvm_tpr_access_ctl tac; 3525 3526 r = -EFAULT; 3527 if (copy_from_user(&tac, argp, sizeof tac)) 3528 goto out; 3529 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); 3530 if (r) 3531 goto out; 3532 r = -EFAULT; 3533 if (copy_to_user(argp, &tac, sizeof tac)) 3534 goto out; 3535 r = 0; 3536 break; 3537 }; 3538 case KVM_SET_VAPIC_ADDR: { 3539 struct kvm_vapic_addr va; 3540 int idx; 3541 3542 r = -EINVAL; 3543 if (!lapic_in_kernel(vcpu)) 3544 goto out; 3545 r = -EFAULT; 3546 if (copy_from_user(&va, argp, sizeof va)) 3547 goto out; 3548 idx = srcu_read_lock(&vcpu->kvm->srcu); 3549 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); 3550 srcu_read_unlock(&vcpu->kvm->srcu, idx); 3551 break; 3552 } 3553 case KVM_X86_SETUP_MCE: { 3554 u64 mcg_cap; 3555 3556 r = -EFAULT; 3557 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap)) 3558 goto out; 3559 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); 3560 break; 3561 } 3562 case KVM_X86_SET_MCE: { 3563 struct kvm_x86_mce mce; 3564 3565 r = -EFAULT; 3566 if (copy_from_user(&mce, argp, sizeof mce)) 3567 goto out; 3568 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); 3569 break; 3570 } 3571 case KVM_GET_VCPU_EVENTS: { 3572 struct kvm_vcpu_events events; 3573 3574 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); 3575 3576 r = -EFAULT; 3577 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) 3578 break; 3579 r = 0; 3580 break; 3581 } 3582 case KVM_SET_VCPU_EVENTS: { 3583 struct kvm_vcpu_events events; 3584 3585 r = -EFAULT; 3586 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) 3587 break; 3588 3589 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); 3590 break; 3591 } 3592 case KVM_GET_DEBUGREGS: { 3593 struct kvm_debugregs dbgregs; 3594 3595 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs); 3596 3597 r = -EFAULT; 3598 if (copy_to_user(argp, &dbgregs, 3599 sizeof(struct kvm_debugregs))) 3600 break; 3601 r = 0; 3602 break; 3603 } 3604 case KVM_SET_DEBUGREGS: { 3605 struct kvm_debugregs dbgregs; 3606 3607 r = -EFAULT; 3608 if (copy_from_user(&dbgregs, argp, 3609 sizeof(struct kvm_debugregs))) 3610 break; 3611 3612 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs); 3613 break; 3614 } 3615 case KVM_GET_XSAVE: { 3616 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL); 3617 r = -ENOMEM; 3618 if (!u.xsave) 3619 break; 3620 3621 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave); 3622 3623 r = -EFAULT; 3624 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave))) 3625 break; 3626 r = 0; 3627 break; 3628 } 3629 case KVM_SET_XSAVE: { 3630 u.xsave = memdup_user(argp, sizeof(*u.xsave)); 3631 if (IS_ERR(u.xsave)) 3632 return PTR_ERR(u.xsave); 3633 3634 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave); 3635 break; 3636 } 3637 case KVM_GET_XCRS: { 3638 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL); 3639 r = -ENOMEM; 3640 if (!u.xcrs) 3641 break; 3642 3643 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs); 3644 3645 r = -EFAULT; 3646 if (copy_to_user(argp, u.xcrs, 3647 sizeof(struct kvm_xcrs))) 3648 break; 3649 r = 0; 3650 break; 3651 } 3652 case KVM_SET_XCRS: { 3653 u.xcrs = memdup_user(argp, sizeof(*u.xcrs)); 3654 if (IS_ERR(u.xcrs)) 3655 return PTR_ERR(u.xcrs); 3656 3657 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs); 3658 break; 3659 } 3660 case KVM_SET_TSC_KHZ: { 3661 u32 user_tsc_khz; 3662 3663 r = -EINVAL; 3664 user_tsc_khz = (u32)arg; 3665 3666 if (user_tsc_khz >= kvm_max_guest_tsc_khz) 3667 goto out; 3668 3669 if (user_tsc_khz == 0) 3670 user_tsc_khz = tsc_khz; 3671 3672 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz)) 3673 r = 0; 3674 3675 goto out; 3676 } 3677 case KVM_GET_TSC_KHZ: { 3678 r = vcpu->arch.virtual_tsc_khz; 3679 goto out; 3680 } 3681 case KVM_KVMCLOCK_CTRL: { 3682 r = kvm_set_guest_paused(vcpu); 3683 goto out; 3684 } 3685 case KVM_ENABLE_CAP: { 3686 struct kvm_enable_cap cap; 3687 3688 r = -EFAULT; 3689 if (copy_from_user(&cap, argp, sizeof(cap))) 3690 goto out; 3691 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 3692 break; 3693 } 3694 default: 3695 r = -EINVAL; 3696 } 3697 out: 3698 kfree(u.buffer); 3699 return r; 3700 } 3701 3702 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 3703 { 3704 return VM_FAULT_SIGBUS; 3705 } 3706 3707 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) 3708 { 3709 int ret; 3710 3711 if (addr > (unsigned int)(-3 * PAGE_SIZE)) 3712 return -EINVAL; 3713 ret = kvm_x86_ops->set_tss_addr(kvm, addr); 3714 return ret; 3715 } 3716 3717 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, 3718 u64 ident_addr) 3719 { 3720 kvm->arch.ept_identity_map_addr = ident_addr; 3721 return 0; 3722 } 3723 3724 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, 3725 u32 kvm_nr_mmu_pages) 3726 { 3727 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) 3728 return -EINVAL; 3729 3730 mutex_lock(&kvm->slots_lock); 3731 3732 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); 3733 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; 3734 3735 mutex_unlock(&kvm->slots_lock); 3736 return 0; 3737 } 3738 3739 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) 3740 { 3741 return kvm->arch.n_max_mmu_pages; 3742 } 3743 3744 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 3745 { 3746 struct kvm_pic *pic = kvm->arch.vpic; 3747 int r; 3748 3749 r = 0; 3750 switch (chip->chip_id) { 3751 case KVM_IRQCHIP_PIC_MASTER: 3752 memcpy(&chip->chip.pic, &pic->pics[0], 3753 sizeof(struct kvm_pic_state)); 3754 break; 3755 case KVM_IRQCHIP_PIC_SLAVE: 3756 memcpy(&chip->chip.pic, &pic->pics[1], 3757 sizeof(struct kvm_pic_state)); 3758 break; 3759 case KVM_IRQCHIP_IOAPIC: 3760 kvm_get_ioapic(kvm, &chip->chip.ioapic); 3761 break; 3762 default: 3763 r = -EINVAL; 3764 break; 3765 } 3766 return r; 3767 } 3768 3769 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) 3770 { 3771 struct kvm_pic *pic = kvm->arch.vpic; 3772 int r; 3773 3774 r = 0; 3775 switch (chip->chip_id) { 3776 case KVM_IRQCHIP_PIC_MASTER: 3777 spin_lock(&pic->lock); 3778 memcpy(&pic->pics[0], &chip->chip.pic, 3779 sizeof(struct kvm_pic_state)); 3780 spin_unlock(&pic->lock); 3781 break; 3782 case KVM_IRQCHIP_PIC_SLAVE: 3783 spin_lock(&pic->lock); 3784 memcpy(&pic->pics[1], &chip->chip.pic, 3785 sizeof(struct kvm_pic_state)); 3786 spin_unlock(&pic->lock); 3787 break; 3788 case KVM_IRQCHIP_IOAPIC: 3789 kvm_set_ioapic(kvm, &chip->chip.ioapic); 3790 break; 3791 default: 3792 r = -EINVAL; 3793 break; 3794 } 3795 kvm_pic_update_irq(pic); 3796 return r; 3797 } 3798 3799 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) 3800 { 3801 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state; 3802 3803 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels)); 3804 3805 mutex_lock(&kps->lock); 3806 memcpy(ps, &kps->channels, sizeof(*ps)); 3807 mutex_unlock(&kps->lock); 3808 return 0; 3809 } 3810 3811 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) 3812 { 3813 int i; 3814 struct kvm_pit *pit = kvm->arch.vpit; 3815 3816 mutex_lock(&pit->pit_state.lock); 3817 memcpy(&pit->pit_state.channels, ps, sizeof(*ps)); 3818 for (i = 0; i < 3; i++) 3819 kvm_pit_load_count(pit, i, ps->channels[i].count, 0); 3820 mutex_unlock(&pit->pit_state.lock); 3821 return 0; 3822 } 3823 3824 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 3825 { 3826 mutex_lock(&kvm->arch.vpit->pit_state.lock); 3827 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, 3828 sizeof(ps->channels)); 3829 ps->flags = kvm->arch.vpit->pit_state.flags; 3830 mutex_unlock(&kvm->arch.vpit->pit_state.lock); 3831 memset(&ps->reserved, 0, sizeof(ps->reserved)); 3832 return 0; 3833 } 3834 3835 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) 3836 { 3837 int start = 0; 3838 int i; 3839 u32 prev_legacy, cur_legacy; 3840 struct kvm_pit *pit = kvm->arch.vpit; 3841 3842 mutex_lock(&pit->pit_state.lock); 3843 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; 3844 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; 3845 if (!prev_legacy && cur_legacy) 3846 start = 1; 3847 memcpy(&pit->pit_state.channels, &ps->channels, 3848 sizeof(pit->pit_state.channels)); 3849 pit->pit_state.flags = ps->flags; 3850 for (i = 0; i < 3; i++) 3851 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, 3852 start && i == 0); 3853 mutex_unlock(&pit->pit_state.lock); 3854 return 0; 3855 } 3856 3857 static int kvm_vm_ioctl_reinject(struct kvm *kvm, 3858 struct kvm_reinject_control *control) 3859 { 3860 struct kvm_pit *pit = kvm->arch.vpit; 3861 3862 if (!pit) 3863 return -ENXIO; 3864 3865 /* pit->pit_state.lock was overloaded to prevent userspace from getting 3866 * an inconsistent state after running multiple KVM_REINJECT_CONTROL 3867 * ioctls in parallel. Use a separate lock if that ioctl isn't rare. 3868 */ 3869 mutex_lock(&pit->pit_state.lock); 3870 kvm_pit_set_reinject(pit, control->pit_reinject); 3871 mutex_unlock(&pit->pit_state.lock); 3872 3873 return 0; 3874 } 3875 3876 /** 3877 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot 3878 * @kvm: kvm instance 3879 * @log: slot id and address to which we copy the log 3880 * 3881 * Steps 1-4 below provide general overview of dirty page logging. See 3882 * kvm_get_dirty_log_protect() function description for additional details. 3883 * 3884 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we 3885 * always flush the TLB (step 4) even if previous step failed and the dirty 3886 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API 3887 * does not preclude user space subsequent dirty log read. Flushing TLB ensures 3888 * writes will be marked dirty for next log read. 3889 * 3890 * 1. Take a snapshot of the bit and clear it if needed. 3891 * 2. Write protect the corresponding page. 3892 * 3. Copy the snapshot to the userspace. 3893 * 4. Flush TLB's if needed. 3894 */ 3895 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 3896 { 3897 bool is_dirty = false; 3898 int r; 3899 3900 mutex_lock(&kvm->slots_lock); 3901 3902 /* 3903 * Flush potentially hardware-cached dirty pages to dirty_bitmap. 3904 */ 3905 if (kvm_x86_ops->flush_log_dirty) 3906 kvm_x86_ops->flush_log_dirty(kvm); 3907 3908 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); 3909 3910 /* 3911 * All the TLBs can be flushed out of mmu lock, see the comments in 3912 * kvm_mmu_slot_remove_write_access(). 3913 */ 3914 lockdep_assert_held(&kvm->slots_lock); 3915 if (is_dirty) 3916 kvm_flush_remote_tlbs(kvm); 3917 3918 mutex_unlock(&kvm->slots_lock); 3919 return r; 3920 } 3921 3922 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, 3923 bool line_status) 3924 { 3925 if (!irqchip_in_kernel(kvm)) 3926 return -ENXIO; 3927 3928 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 3929 irq_event->irq, irq_event->level, 3930 line_status); 3931 return 0; 3932 } 3933 3934 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 3935 struct kvm_enable_cap *cap) 3936 { 3937 int r; 3938 3939 if (cap->flags) 3940 return -EINVAL; 3941 3942 switch (cap->cap) { 3943 case KVM_CAP_DISABLE_QUIRKS: 3944 kvm->arch.disabled_quirks = cap->args[0]; 3945 r = 0; 3946 break; 3947 case KVM_CAP_SPLIT_IRQCHIP: { 3948 mutex_lock(&kvm->lock); 3949 r = -EINVAL; 3950 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS) 3951 goto split_irqchip_unlock; 3952 r = -EEXIST; 3953 if (irqchip_in_kernel(kvm)) 3954 goto split_irqchip_unlock; 3955 if (kvm->created_vcpus) 3956 goto split_irqchip_unlock; 3957 r = kvm_setup_empty_irq_routing(kvm); 3958 if (r) 3959 goto split_irqchip_unlock; 3960 /* Pairs with irqchip_in_kernel. */ 3961 smp_wmb(); 3962 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT; 3963 kvm->arch.nr_reserved_ioapic_pins = cap->args[0]; 3964 r = 0; 3965 split_irqchip_unlock: 3966 mutex_unlock(&kvm->lock); 3967 break; 3968 } 3969 case KVM_CAP_X2APIC_API: 3970 r = -EINVAL; 3971 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS) 3972 break; 3973 3974 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS) 3975 kvm->arch.x2apic_format = true; 3976 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK) 3977 kvm->arch.x2apic_broadcast_quirk_disabled = true; 3978 3979 r = 0; 3980 break; 3981 default: 3982 r = -EINVAL; 3983 break; 3984 } 3985 return r; 3986 } 3987 3988 long kvm_arch_vm_ioctl(struct file *filp, 3989 unsigned int ioctl, unsigned long arg) 3990 { 3991 struct kvm *kvm = filp->private_data; 3992 void __user *argp = (void __user *)arg; 3993 int r = -ENOTTY; 3994 /* 3995 * This union makes it completely explicit to gcc-3.x 3996 * that these two variables' stack usage should be 3997 * combined, not added together. 3998 */ 3999 union { 4000 struct kvm_pit_state ps; 4001 struct kvm_pit_state2 ps2; 4002 struct kvm_pit_config pit_config; 4003 } u; 4004 4005 switch (ioctl) { 4006 case KVM_SET_TSS_ADDR: 4007 r = kvm_vm_ioctl_set_tss_addr(kvm, arg); 4008 break; 4009 case KVM_SET_IDENTITY_MAP_ADDR: { 4010 u64 ident_addr; 4011 4012 r = -EFAULT; 4013 if (copy_from_user(&ident_addr, argp, sizeof ident_addr)) 4014 goto out; 4015 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); 4016 break; 4017 } 4018 case KVM_SET_NR_MMU_PAGES: 4019 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); 4020 break; 4021 case KVM_GET_NR_MMU_PAGES: 4022 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); 4023 break; 4024 case KVM_CREATE_IRQCHIP: { 4025 mutex_lock(&kvm->lock); 4026 4027 r = -EEXIST; 4028 if (irqchip_in_kernel(kvm)) 4029 goto create_irqchip_unlock; 4030 4031 r = -EINVAL; 4032 if (kvm->created_vcpus) 4033 goto create_irqchip_unlock; 4034 4035 r = kvm_pic_init(kvm); 4036 if (r) 4037 goto create_irqchip_unlock; 4038 4039 r = kvm_ioapic_init(kvm); 4040 if (r) { 4041 kvm_pic_destroy(kvm); 4042 goto create_irqchip_unlock; 4043 } 4044 4045 r = kvm_setup_default_irq_routing(kvm); 4046 if (r) { 4047 kvm_ioapic_destroy(kvm); 4048 kvm_pic_destroy(kvm); 4049 goto create_irqchip_unlock; 4050 } 4051 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */ 4052 smp_wmb(); 4053 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL; 4054 create_irqchip_unlock: 4055 mutex_unlock(&kvm->lock); 4056 break; 4057 } 4058 case KVM_CREATE_PIT: 4059 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; 4060 goto create_pit; 4061 case KVM_CREATE_PIT2: 4062 r = -EFAULT; 4063 if (copy_from_user(&u.pit_config, argp, 4064 sizeof(struct kvm_pit_config))) 4065 goto out; 4066 create_pit: 4067 mutex_lock(&kvm->lock); 4068 r = -EEXIST; 4069 if (kvm->arch.vpit) 4070 goto create_pit_unlock; 4071 r = -ENOMEM; 4072 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); 4073 if (kvm->arch.vpit) 4074 r = 0; 4075 create_pit_unlock: 4076 mutex_unlock(&kvm->lock); 4077 break; 4078 case KVM_GET_IRQCHIP: { 4079 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4080 struct kvm_irqchip *chip; 4081 4082 chip = memdup_user(argp, sizeof(*chip)); 4083 if (IS_ERR(chip)) { 4084 r = PTR_ERR(chip); 4085 goto out; 4086 } 4087 4088 r = -ENXIO; 4089 if (!irqchip_kernel(kvm)) 4090 goto get_irqchip_out; 4091 r = kvm_vm_ioctl_get_irqchip(kvm, chip); 4092 if (r) 4093 goto get_irqchip_out; 4094 r = -EFAULT; 4095 if (copy_to_user(argp, chip, sizeof *chip)) 4096 goto get_irqchip_out; 4097 r = 0; 4098 get_irqchip_out: 4099 kfree(chip); 4100 break; 4101 } 4102 case KVM_SET_IRQCHIP: { 4103 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ 4104 struct kvm_irqchip *chip; 4105 4106 chip = memdup_user(argp, sizeof(*chip)); 4107 if (IS_ERR(chip)) { 4108 r = PTR_ERR(chip); 4109 goto out; 4110 } 4111 4112 r = -ENXIO; 4113 if (!irqchip_kernel(kvm)) 4114 goto set_irqchip_out; 4115 r = kvm_vm_ioctl_set_irqchip(kvm, chip); 4116 if (r) 4117 goto set_irqchip_out; 4118 r = 0; 4119 set_irqchip_out: 4120 kfree(chip); 4121 break; 4122 } 4123 case KVM_GET_PIT: { 4124 r = -EFAULT; 4125 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) 4126 goto out; 4127 r = -ENXIO; 4128 if (!kvm->arch.vpit) 4129 goto out; 4130 r = kvm_vm_ioctl_get_pit(kvm, &u.ps); 4131 if (r) 4132 goto out; 4133 r = -EFAULT; 4134 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) 4135 goto out; 4136 r = 0; 4137 break; 4138 } 4139 case KVM_SET_PIT: { 4140 r = -EFAULT; 4141 if (copy_from_user(&u.ps, argp, sizeof u.ps)) 4142 goto out; 4143 r = -ENXIO; 4144 if (!kvm->arch.vpit) 4145 goto out; 4146 r = kvm_vm_ioctl_set_pit(kvm, &u.ps); 4147 break; 4148 } 4149 case KVM_GET_PIT2: { 4150 r = -ENXIO; 4151 if (!kvm->arch.vpit) 4152 goto out; 4153 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); 4154 if (r) 4155 goto out; 4156 r = -EFAULT; 4157 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) 4158 goto out; 4159 r = 0; 4160 break; 4161 } 4162 case KVM_SET_PIT2: { 4163 r = -EFAULT; 4164 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) 4165 goto out; 4166 r = -ENXIO; 4167 if (!kvm->arch.vpit) 4168 goto out; 4169 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); 4170 break; 4171 } 4172 case KVM_REINJECT_CONTROL: { 4173 struct kvm_reinject_control control; 4174 r = -EFAULT; 4175 if (copy_from_user(&control, argp, sizeof(control))) 4176 goto out; 4177 r = kvm_vm_ioctl_reinject(kvm, &control); 4178 break; 4179 } 4180 case KVM_SET_BOOT_CPU_ID: 4181 r = 0; 4182 mutex_lock(&kvm->lock); 4183 if (kvm->created_vcpus) 4184 r = -EBUSY; 4185 else 4186 kvm->arch.bsp_vcpu_id = arg; 4187 mutex_unlock(&kvm->lock); 4188 break; 4189 case KVM_XEN_HVM_CONFIG: { 4190 r = -EFAULT; 4191 if (copy_from_user(&kvm->arch.xen_hvm_config, argp, 4192 sizeof(struct kvm_xen_hvm_config))) 4193 goto out; 4194 r = -EINVAL; 4195 if (kvm->arch.xen_hvm_config.flags) 4196 goto out; 4197 r = 0; 4198 break; 4199 } 4200 case KVM_SET_CLOCK: { 4201 struct kvm_clock_data user_ns; 4202 u64 now_ns; 4203 4204 r = -EFAULT; 4205 if (copy_from_user(&user_ns, argp, sizeof(user_ns))) 4206 goto out; 4207 4208 r = -EINVAL; 4209 if (user_ns.flags) 4210 goto out; 4211 4212 r = 0; 4213 /* 4214 * TODO: userspace has to take care of races with VCPU_RUN, so 4215 * kvm_gen_update_masterclock() can be cut down to locked 4216 * pvclock_update_vm_gtod_copy(). 4217 */ 4218 kvm_gen_update_masterclock(kvm); 4219 now_ns = get_kvmclock_ns(kvm); 4220 kvm->arch.kvmclock_offset += user_ns.clock - now_ns; 4221 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE); 4222 break; 4223 } 4224 case KVM_GET_CLOCK: { 4225 struct kvm_clock_data user_ns; 4226 u64 now_ns; 4227 4228 now_ns = get_kvmclock_ns(kvm); 4229 user_ns.clock = now_ns; 4230 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0; 4231 memset(&user_ns.pad, 0, sizeof(user_ns.pad)); 4232 4233 r = -EFAULT; 4234 if (copy_to_user(argp, &user_ns, sizeof(user_ns))) 4235 goto out; 4236 r = 0; 4237 break; 4238 } 4239 case KVM_ENABLE_CAP: { 4240 struct kvm_enable_cap cap; 4241 4242 r = -EFAULT; 4243 if (copy_from_user(&cap, argp, sizeof(cap))) 4244 goto out; 4245 r = kvm_vm_ioctl_enable_cap(kvm, &cap); 4246 break; 4247 } 4248 default: 4249 r = -ENOTTY; 4250 } 4251 out: 4252 return r; 4253 } 4254 4255 static void kvm_init_msr_list(void) 4256 { 4257 u32 dummy[2]; 4258 unsigned i, j; 4259 4260 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { 4261 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) 4262 continue; 4263 4264 /* 4265 * Even MSRs that are valid in the host may not be exposed 4266 * to the guests in some cases. 4267 */ 4268 switch (msrs_to_save[i]) { 4269 case MSR_IA32_BNDCFGS: 4270 if (!kvm_x86_ops->mpx_supported()) 4271 continue; 4272 break; 4273 case MSR_TSC_AUX: 4274 if (!kvm_x86_ops->rdtscp_supported()) 4275 continue; 4276 break; 4277 default: 4278 break; 4279 } 4280 4281 if (j < i) 4282 msrs_to_save[j] = msrs_to_save[i]; 4283 j++; 4284 } 4285 num_msrs_to_save = j; 4286 4287 for (i = j = 0; i < ARRAY_SIZE(emulated_msrs); i++) { 4288 switch (emulated_msrs[i]) { 4289 case MSR_IA32_SMBASE: 4290 if (!kvm_x86_ops->cpu_has_high_real_mode_segbase()) 4291 continue; 4292 break; 4293 default: 4294 break; 4295 } 4296 4297 if (j < i) 4298 emulated_msrs[j] = emulated_msrs[i]; 4299 j++; 4300 } 4301 num_emulated_msrs = j; 4302 } 4303 4304 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, 4305 const void *v) 4306 { 4307 int handled = 0; 4308 int n; 4309 4310 do { 4311 n = min(len, 8); 4312 if (!(lapic_in_kernel(vcpu) && 4313 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v)) 4314 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v)) 4315 break; 4316 handled += n; 4317 addr += n; 4318 len -= n; 4319 v += n; 4320 } while (len); 4321 4322 return handled; 4323 } 4324 4325 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) 4326 { 4327 int handled = 0; 4328 int n; 4329 4330 do { 4331 n = min(len, 8); 4332 if (!(lapic_in_kernel(vcpu) && 4333 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev, 4334 addr, n, v)) 4335 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v)) 4336 break; 4337 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v); 4338 handled += n; 4339 addr += n; 4340 len -= n; 4341 v += n; 4342 } while (len); 4343 4344 return handled; 4345 } 4346 4347 static void kvm_set_segment(struct kvm_vcpu *vcpu, 4348 struct kvm_segment *var, int seg) 4349 { 4350 kvm_x86_ops->set_segment(vcpu, var, seg); 4351 } 4352 4353 void kvm_get_segment(struct kvm_vcpu *vcpu, 4354 struct kvm_segment *var, int seg) 4355 { 4356 kvm_x86_ops->get_segment(vcpu, var, seg); 4357 } 4358 4359 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access, 4360 struct x86_exception *exception) 4361 { 4362 gpa_t t_gpa; 4363 4364 BUG_ON(!mmu_is_nested(vcpu)); 4365 4366 /* NPT walks are always user-walks */ 4367 access |= PFERR_USER_MASK; 4368 t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, exception); 4369 4370 return t_gpa; 4371 } 4372 4373 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, 4374 struct x86_exception *exception) 4375 { 4376 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4377 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4378 } 4379 4380 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, 4381 struct x86_exception *exception) 4382 { 4383 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4384 access |= PFERR_FETCH_MASK; 4385 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4386 } 4387 4388 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, 4389 struct x86_exception *exception) 4390 { 4391 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4392 access |= PFERR_WRITE_MASK; 4393 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4394 } 4395 4396 /* uses this to access any guest's mapped memory without checking CPL */ 4397 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, 4398 struct x86_exception *exception) 4399 { 4400 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception); 4401 } 4402 4403 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, 4404 struct kvm_vcpu *vcpu, u32 access, 4405 struct x86_exception *exception) 4406 { 4407 void *data = val; 4408 int r = X86EMUL_CONTINUE; 4409 4410 while (bytes) { 4411 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access, 4412 exception); 4413 unsigned offset = addr & (PAGE_SIZE-1); 4414 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); 4415 int ret; 4416 4417 if (gpa == UNMAPPED_GVA) 4418 return X86EMUL_PROPAGATE_FAULT; 4419 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data, 4420 offset, toread); 4421 if (ret < 0) { 4422 r = X86EMUL_IO_NEEDED; 4423 goto out; 4424 } 4425 4426 bytes -= toread; 4427 data += toread; 4428 addr += toread; 4429 } 4430 out: 4431 return r; 4432 } 4433 4434 /* used for instruction fetching */ 4435 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, 4436 gva_t addr, void *val, unsigned int bytes, 4437 struct x86_exception *exception) 4438 { 4439 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4440 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4441 unsigned offset; 4442 int ret; 4443 4444 /* Inline kvm_read_guest_virt_helper for speed. */ 4445 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK, 4446 exception); 4447 if (unlikely(gpa == UNMAPPED_GVA)) 4448 return X86EMUL_PROPAGATE_FAULT; 4449 4450 offset = addr & (PAGE_SIZE-1); 4451 if (WARN_ON(offset + bytes > PAGE_SIZE)) 4452 bytes = (unsigned)PAGE_SIZE - offset; 4453 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val, 4454 offset, bytes); 4455 if (unlikely(ret < 0)) 4456 return X86EMUL_IO_NEEDED; 4457 4458 return X86EMUL_CONTINUE; 4459 } 4460 4461 int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt, 4462 gva_t addr, void *val, unsigned int bytes, 4463 struct x86_exception *exception) 4464 { 4465 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4466 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; 4467 4468 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, 4469 exception); 4470 } 4471 EXPORT_SYMBOL_GPL(kvm_read_guest_virt); 4472 4473 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt, 4474 gva_t addr, void *val, unsigned int bytes, 4475 struct x86_exception *exception) 4476 { 4477 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4478 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception); 4479 } 4480 4481 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, 4482 unsigned long addr, void *val, unsigned int bytes) 4483 { 4484 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4485 int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); 4486 4487 return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; 4488 } 4489 4490 int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt, 4491 gva_t addr, void *val, 4492 unsigned int bytes, 4493 struct x86_exception *exception) 4494 { 4495 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4496 void *data = val; 4497 int r = X86EMUL_CONTINUE; 4498 4499 while (bytes) { 4500 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, 4501 PFERR_WRITE_MASK, 4502 exception); 4503 unsigned offset = addr & (PAGE_SIZE-1); 4504 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); 4505 int ret; 4506 4507 if (gpa == UNMAPPED_GVA) 4508 return X86EMUL_PROPAGATE_FAULT; 4509 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); 4510 if (ret < 0) { 4511 r = X86EMUL_IO_NEEDED; 4512 goto out; 4513 } 4514 4515 bytes -= towrite; 4516 data += towrite; 4517 addr += towrite; 4518 } 4519 out: 4520 return r; 4521 } 4522 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); 4523 4524 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 4525 gpa_t gpa, bool write) 4526 { 4527 /* For APIC access vmexit */ 4528 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 4529 return 1; 4530 4531 if (vcpu_match_mmio_gpa(vcpu, gpa)) { 4532 trace_vcpu_match_mmio(gva, gpa, write, true); 4533 return 1; 4534 } 4535 4536 return 0; 4537 } 4538 4539 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, 4540 gpa_t *gpa, struct x86_exception *exception, 4541 bool write) 4542 { 4543 u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0) 4544 | (write ? PFERR_WRITE_MASK : 0); 4545 4546 /* 4547 * currently PKRU is only applied to ept enabled guest so 4548 * there is no pkey in EPT page table for L1 guest or EPT 4549 * shadow page table for L2 guest. 4550 */ 4551 if (vcpu_match_mmio_gva(vcpu, gva) 4552 && !permission_fault(vcpu, vcpu->arch.walk_mmu, 4553 vcpu->arch.access, 0, access)) { 4554 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | 4555 (gva & (PAGE_SIZE - 1)); 4556 trace_vcpu_match_mmio(gva, *gpa, write, false); 4557 return 1; 4558 } 4559 4560 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); 4561 4562 if (*gpa == UNMAPPED_GVA) 4563 return -1; 4564 4565 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write); 4566 } 4567 4568 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, 4569 const void *val, int bytes) 4570 { 4571 int ret; 4572 4573 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes); 4574 if (ret < 0) 4575 return 0; 4576 kvm_page_track_write(vcpu, gpa, val, bytes); 4577 return 1; 4578 } 4579 4580 struct read_write_emulator_ops { 4581 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val, 4582 int bytes); 4583 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa, 4584 void *val, int bytes); 4585 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 4586 int bytes, void *val); 4587 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, 4588 void *val, int bytes); 4589 bool write; 4590 }; 4591 4592 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes) 4593 { 4594 if (vcpu->mmio_read_completed) { 4595 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, 4596 vcpu->mmio_fragments[0].gpa, *(u64 *)val); 4597 vcpu->mmio_read_completed = 0; 4598 return 1; 4599 } 4600 4601 return 0; 4602 } 4603 4604 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 4605 void *val, int bytes) 4606 { 4607 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes); 4608 } 4609 4610 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, 4611 void *val, int bytes) 4612 { 4613 return emulator_write_phys(vcpu, gpa, val, bytes); 4614 } 4615 4616 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val) 4617 { 4618 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val); 4619 return vcpu_mmio_write(vcpu, gpa, bytes, val); 4620 } 4621 4622 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 4623 void *val, int bytes) 4624 { 4625 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0); 4626 return X86EMUL_IO_NEEDED; 4627 } 4628 4629 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, 4630 void *val, int bytes) 4631 { 4632 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0]; 4633 4634 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len)); 4635 return X86EMUL_CONTINUE; 4636 } 4637 4638 static const struct read_write_emulator_ops read_emultor = { 4639 .read_write_prepare = read_prepare, 4640 .read_write_emulate = read_emulate, 4641 .read_write_mmio = vcpu_mmio_read, 4642 .read_write_exit_mmio = read_exit_mmio, 4643 }; 4644 4645 static const struct read_write_emulator_ops write_emultor = { 4646 .read_write_emulate = write_emulate, 4647 .read_write_mmio = write_mmio, 4648 .read_write_exit_mmio = write_exit_mmio, 4649 .write = true, 4650 }; 4651 4652 static int emulator_read_write_onepage(unsigned long addr, void *val, 4653 unsigned int bytes, 4654 struct x86_exception *exception, 4655 struct kvm_vcpu *vcpu, 4656 const struct read_write_emulator_ops *ops) 4657 { 4658 gpa_t gpa; 4659 int handled, ret; 4660 bool write = ops->write; 4661 struct kvm_mmio_fragment *frag; 4662 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 4663 4664 /* 4665 * If the exit was due to a NPF we may already have a GPA. 4666 * If the GPA is present, use it to avoid the GVA to GPA table walk. 4667 * Note, this cannot be used on string operations since string 4668 * operation using rep will only have the initial GPA from the NPF 4669 * occurred. 4670 */ 4671 if (vcpu->arch.gpa_available && 4672 emulator_can_use_gpa(ctxt) && 4673 vcpu_is_mmio_gpa(vcpu, addr, exception->address, write) && 4674 (addr & ~PAGE_MASK) == (exception->address & ~PAGE_MASK)) { 4675 gpa = exception->address; 4676 goto mmio; 4677 } 4678 4679 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); 4680 4681 if (ret < 0) 4682 return X86EMUL_PROPAGATE_FAULT; 4683 4684 /* For APIC access vmexit */ 4685 if (ret) 4686 goto mmio; 4687 4688 if (ops->read_write_emulate(vcpu, gpa, val, bytes)) 4689 return X86EMUL_CONTINUE; 4690 4691 mmio: 4692 /* 4693 * Is this MMIO handled locally? 4694 */ 4695 handled = ops->read_write_mmio(vcpu, gpa, bytes, val); 4696 if (handled == bytes) 4697 return X86EMUL_CONTINUE; 4698 4699 gpa += handled; 4700 bytes -= handled; 4701 val += handled; 4702 4703 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS); 4704 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++]; 4705 frag->gpa = gpa; 4706 frag->data = val; 4707 frag->len = bytes; 4708 return X86EMUL_CONTINUE; 4709 } 4710 4711 static int emulator_read_write(struct x86_emulate_ctxt *ctxt, 4712 unsigned long addr, 4713 void *val, unsigned int bytes, 4714 struct x86_exception *exception, 4715 const struct read_write_emulator_ops *ops) 4716 { 4717 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4718 gpa_t gpa; 4719 int rc; 4720 4721 if (ops->read_write_prepare && 4722 ops->read_write_prepare(vcpu, val, bytes)) 4723 return X86EMUL_CONTINUE; 4724 4725 vcpu->mmio_nr_fragments = 0; 4726 4727 /* Crossing a page boundary? */ 4728 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { 4729 int now; 4730 4731 now = -addr & ~PAGE_MASK; 4732 rc = emulator_read_write_onepage(addr, val, now, exception, 4733 vcpu, ops); 4734 4735 if (rc != X86EMUL_CONTINUE) 4736 return rc; 4737 addr += now; 4738 if (ctxt->mode != X86EMUL_MODE_PROT64) 4739 addr = (u32)addr; 4740 val += now; 4741 bytes -= now; 4742 } 4743 4744 rc = emulator_read_write_onepage(addr, val, bytes, exception, 4745 vcpu, ops); 4746 if (rc != X86EMUL_CONTINUE) 4747 return rc; 4748 4749 if (!vcpu->mmio_nr_fragments) 4750 return rc; 4751 4752 gpa = vcpu->mmio_fragments[0].gpa; 4753 4754 vcpu->mmio_needed = 1; 4755 vcpu->mmio_cur_fragment = 0; 4756 4757 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len); 4758 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write; 4759 vcpu->run->exit_reason = KVM_EXIT_MMIO; 4760 vcpu->run->mmio.phys_addr = gpa; 4761 4762 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); 4763 } 4764 4765 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, 4766 unsigned long addr, 4767 void *val, 4768 unsigned int bytes, 4769 struct x86_exception *exception) 4770 { 4771 return emulator_read_write(ctxt, addr, val, bytes, 4772 exception, &read_emultor); 4773 } 4774 4775 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, 4776 unsigned long addr, 4777 const void *val, 4778 unsigned int bytes, 4779 struct x86_exception *exception) 4780 { 4781 return emulator_read_write(ctxt, addr, (void *)val, bytes, 4782 exception, &write_emultor); 4783 } 4784 4785 #define CMPXCHG_TYPE(t, ptr, old, new) \ 4786 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old)) 4787 4788 #ifdef CONFIG_X86_64 4789 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new) 4790 #else 4791 # define CMPXCHG64(ptr, old, new) \ 4792 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old)) 4793 #endif 4794 4795 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, 4796 unsigned long addr, 4797 const void *old, 4798 const void *new, 4799 unsigned int bytes, 4800 struct x86_exception *exception) 4801 { 4802 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4803 gpa_t gpa; 4804 struct page *page; 4805 char *kaddr; 4806 bool exchanged; 4807 4808 /* guests cmpxchg8b have to be emulated atomically */ 4809 if (bytes > 8 || (bytes & (bytes - 1))) 4810 goto emul_write; 4811 4812 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); 4813 4814 if (gpa == UNMAPPED_GVA || 4815 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) 4816 goto emul_write; 4817 4818 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) 4819 goto emul_write; 4820 4821 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); 4822 if (is_error_page(page)) 4823 goto emul_write; 4824 4825 kaddr = kmap_atomic(page); 4826 kaddr += offset_in_page(gpa); 4827 switch (bytes) { 4828 case 1: 4829 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new); 4830 break; 4831 case 2: 4832 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new); 4833 break; 4834 case 4: 4835 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new); 4836 break; 4837 case 8: 4838 exchanged = CMPXCHG64(kaddr, old, new); 4839 break; 4840 default: 4841 BUG(); 4842 } 4843 kunmap_atomic(kaddr); 4844 kvm_release_page_dirty(page); 4845 4846 if (!exchanged) 4847 return X86EMUL_CMPXCHG_FAILED; 4848 4849 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); 4850 kvm_page_track_write(vcpu, gpa, new, bytes); 4851 4852 return X86EMUL_CONTINUE; 4853 4854 emul_write: 4855 printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); 4856 4857 return emulator_write_emulated(ctxt, addr, new, bytes, exception); 4858 } 4859 4860 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) 4861 { 4862 int r = 0, i; 4863 4864 for (i = 0; i < vcpu->arch.pio.count; i++) { 4865 if (vcpu->arch.pio.in) 4866 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port, 4867 vcpu->arch.pio.size, pd); 4868 else 4869 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS, 4870 vcpu->arch.pio.port, vcpu->arch.pio.size, 4871 pd); 4872 if (r) 4873 break; 4874 pd += vcpu->arch.pio.size; 4875 } 4876 return r; 4877 } 4878 4879 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, 4880 unsigned short port, void *val, 4881 unsigned int count, bool in) 4882 { 4883 vcpu->arch.pio.port = port; 4884 vcpu->arch.pio.in = in; 4885 vcpu->arch.pio.count = count; 4886 vcpu->arch.pio.size = size; 4887 4888 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { 4889 vcpu->arch.pio.count = 0; 4890 return 1; 4891 } 4892 4893 vcpu->run->exit_reason = KVM_EXIT_IO; 4894 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; 4895 vcpu->run->io.size = size; 4896 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; 4897 vcpu->run->io.count = count; 4898 vcpu->run->io.port = port; 4899 4900 return 0; 4901 } 4902 4903 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, 4904 int size, unsigned short port, void *val, 4905 unsigned int count) 4906 { 4907 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4908 int ret; 4909 4910 if (vcpu->arch.pio.count) 4911 goto data_avail; 4912 4913 memset(vcpu->arch.pio_data, 0, size * count); 4914 4915 ret = emulator_pio_in_out(vcpu, size, port, val, count, true); 4916 if (ret) { 4917 data_avail: 4918 memcpy(val, vcpu->arch.pio_data, size * count); 4919 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); 4920 vcpu->arch.pio.count = 0; 4921 return 1; 4922 } 4923 4924 return 0; 4925 } 4926 4927 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, 4928 int size, unsigned short port, 4929 const void *val, unsigned int count) 4930 { 4931 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 4932 4933 memcpy(vcpu->arch.pio_data, val, size * count); 4934 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); 4935 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); 4936 } 4937 4938 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) 4939 { 4940 return kvm_x86_ops->get_segment_base(vcpu, seg); 4941 } 4942 4943 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address) 4944 { 4945 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address); 4946 } 4947 4948 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu) 4949 { 4950 if (!need_emulate_wbinvd(vcpu)) 4951 return X86EMUL_CONTINUE; 4952 4953 if (kvm_x86_ops->has_wbinvd_exit()) { 4954 int cpu = get_cpu(); 4955 4956 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); 4957 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask, 4958 wbinvd_ipi, NULL, 1); 4959 put_cpu(); 4960 cpumask_clear(vcpu->arch.wbinvd_dirty_mask); 4961 } else 4962 wbinvd(); 4963 return X86EMUL_CONTINUE; 4964 } 4965 4966 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu) 4967 { 4968 kvm_emulate_wbinvd_noskip(vcpu); 4969 return kvm_skip_emulated_instruction(vcpu); 4970 } 4971 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd); 4972 4973 4974 4975 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt) 4976 { 4977 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt)); 4978 } 4979 4980 static int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, 4981 unsigned long *dest) 4982 { 4983 return kvm_get_dr(emul_to_vcpu(ctxt), dr, dest); 4984 } 4985 4986 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, 4987 unsigned long value) 4988 { 4989 4990 return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value); 4991 } 4992 4993 static u64 mk_cr_64(u64 curr_cr, u32 new_val) 4994 { 4995 return (curr_cr & ~((1ULL << 32) - 1)) | new_val; 4996 } 4997 4998 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr) 4999 { 5000 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5001 unsigned long value; 5002 5003 switch (cr) { 5004 case 0: 5005 value = kvm_read_cr0(vcpu); 5006 break; 5007 case 2: 5008 value = vcpu->arch.cr2; 5009 break; 5010 case 3: 5011 value = kvm_read_cr3(vcpu); 5012 break; 5013 case 4: 5014 value = kvm_read_cr4(vcpu); 5015 break; 5016 case 8: 5017 value = kvm_get_cr8(vcpu); 5018 break; 5019 default: 5020 kvm_err("%s: unexpected cr %u\n", __func__, cr); 5021 return 0; 5022 } 5023 5024 return value; 5025 } 5026 5027 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val) 5028 { 5029 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5030 int res = 0; 5031 5032 switch (cr) { 5033 case 0: 5034 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); 5035 break; 5036 case 2: 5037 vcpu->arch.cr2 = val; 5038 break; 5039 case 3: 5040 res = kvm_set_cr3(vcpu, val); 5041 break; 5042 case 4: 5043 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); 5044 break; 5045 case 8: 5046 res = kvm_set_cr8(vcpu, val); 5047 break; 5048 default: 5049 kvm_err("%s: unexpected cr %u\n", __func__, cr); 5050 res = -1; 5051 } 5052 5053 return res; 5054 } 5055 5056 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt) 5057 { 5058 return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt)); 5059 } 5060 5061 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5062 { 5063 kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt); 5064 } 5065 5066 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5067 { 5068 kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt); 5069 } 5070 5071 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5072 { 5073 kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt); 5074 } 5075 5076 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) 5077 { 5078 kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt); 5079 } 5080 5081 static unsigned long emulator_get_cached_segment_base( 5082 struct x86_emulate_ctxt *ctxt, int seg) 5083 { 5084 return get_segment_base(emul_to_vcpu(ctxt), seg); 5085 } 5086 5087 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector, 5088 struct desc_struct *desc, u32 *base3, 5089 int seg) 5090 { 5091 struct kvm_segment var; 5092 5093 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg); 5094 *selector = var.selector; 5095 5096 if (var.unusable) { 5097 memset(desc, 0, sizeof(*desc)); 5098 if (base3) 5099 *base3 = 0; 5100 return false; 5101 } 5102 5103 if (var.g) 5104 var.limit >>= 12; 5105 set_desc_limit(desc, var.limit); 5106 set_desc_base(desc, (unsigned long)var.base); 5107 #ifdef CONFIG_X86_64 5108 if (base3) 5109 *base3 = var.base >> 32; 5110 #endif 5111 desc->type = var.type; 5112 desc->s = var.s; 5113 desc->dpl = var.dpl; 5114 desc->p = var.present; 5115 desc->avl = var.avl; 5116 desc->l = var.l; 5117 desc->d = var.db; 5118 desc->g = var.g; 5119 5120 return true; 5121 } 5122 5123 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector, 5124 struct desc_struct *desc, u32 base3, 5125 int seg) 5126 { 5127 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5128 struct kvm_segment var; 5129 5130 var.selector = selector; 5131 var.base = get_desc_base(desc); 5132 #ifdef CONFIG_X86_64 5133 var.base |= ((u64)base3) << 32; 5134 #endif 5135 var.limit = get_desc_limit(desc); 5136 if (desc->g) 5137 var.limit = (var.limit << 12) | 0xfff; 5138 var.type = desc->type; 5139 var.dpl = desc->dpl; 5140 var.db = desc->d; 5141 var.s = desc->s; 5142 var.l = desc->l; 5143 var.g = desc->g; 5144 var.avl = desc->avl; 5145 var.present = desc->p; 5146 var.unusable = !var.present; 5147 var.padding = 0; 5148 5149 kvm_set_segment(vcpu, &var, seg); 5150 return; 5151 } 5152 5153 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, 5154 u32 msr_index, u64 *pdata) 5155 { 5156 struct msr_data msr; 5157 int r; 5158 5159 msr.index = msr_index; 5160 msr.host_initiated = false; 5161 r = kvm_get_msr(emul_to_vcpu(ctxt), &msr); 5162 if (r) 5163 return r; 5164 5165 *pdata = msr.data; 5166 return 0; 5167 } 5168 5169 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, 5170 u32 msr_index, u64 data) 5171 { 5172 struct msr_data msr; 5173 5174 msr.data = data; 5175 msr.index = msr_index; 5176 msr.host_initiated = false; 5177 return kvm_set_msr(emul_to_vcpu(ctxt), &msr); 5178 } 5179 5180 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt) 5181 { 5182 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5183 5184 return vcpu->arch.smbase; 5185 } 5186 5187 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase) 5188 { 5189 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5190 5191 vcpu->arch.smbase = smbase; 5192 } 5193 5194 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt, 5195 u32 pmc) 5196 { 5197 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt), pmc); 5198 } 5199 5200 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, 5201 u32 pmc, u64 *pdata) 5202 { 5203 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata); 5204 } 5205 5206 static void emulator_halt(struct x86_emulate_ctxt *ctxt) 5207 { 5208 emul_to_vcpu(ctxt)->arch.halt_request = 1; 5209 } 5210 5211 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt) 5212 { 5213 preempt_disable(); 5214 kvm_load_guest_fpu(emul_to_vcpu(ctxt)); 5215 } 5216 5217 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt) 5218 { 5219 preempt_enable(); 5220 } 5221 5222 static int emulator_intercept(struct x86_emulate_ctxt *ctxt, 5223 struct x86_instruction_info *info, 5224 enum x86_intercept_stage stage) 5225 { 5226 return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage); 5227 } 5228 5229 static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, 5230 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) 5231 { 5232 kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx); 5233 } 5234 5235 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) 5236 { 5237 return kvm_register_read(emul_to_vcpu(ctxt), reg); 5238 } 5239 5240 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) 5241 { 5242 kvm_register_write(emul_to_vcpu(ctxt), reg, val); 5243 } 5244 5245 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked) 5246 { 5247 kvm_x86_ops->set_nmi_mask(emul_to_vcpu(ctxt), masked); 5248 } 5249 5250 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt) 5251 { 5252 return emul_to_vcpu(ctxt)->arch.hflags; 5253 } 5254 5255 static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags) 5256 { 5257 kvm_set_hflags(emul_to_vcpu(ctxt), emul_flags); 5258 } 5259 5260 static const struct x86_emulate_ops emulate_ops = { 5261 .read_gpr = emulator_read_gpr, 5262 .write_gpr = emulator_write_gpr, 5263 .read_std = kvm_read_guest_virt_system, 5264 .write_std = kvm_write_guest_virt_system, 5265 .read_phys = kvm_read_guest_phys_system, 5266 .fetch = kvm_fetch_guest_virt, 5267 .read_emulated = emulator_read_emulated, 5268 .write_emulated = emulator_write_emulated, 5269 .cmpxchg_emulated = emulator_cmpxchg_emulated, 5270 .invlpg = emulator_invlpg, 5271 .pio_in_emulated = emulator_pio_in_emulated, 5272 .pio_out_emulated = emulator_pio_out_emulated, 5273 .get_segment = emulator_get_segment, 5274 .set_segment = emulator_set_segment, 5275 .get_cached_segment_base = emulator_get_cached_segment_base, 5276 .get_gdt = emulator_get_gdt, 5277 .get_idt = emulator_get_idt, 5278 .set_gdt = emulator_set_gdt, 5279 .set_idt = emulator_set_idt, 5280 .get_cr = emulator_get_cr, 5281 .set_cr = emulator_set_cr, 5282 .cpl = emulator_get_cpl, 5283 .get_dr = emulator_get_dr, 5284 .set_dr = emulator_set_dr, 5285 .get_smbase = emulator_get_smbase, 5286 .set_smbase = emulator_set_smbase, 5287 .set_msr = emulator_set_msr, 5288 .get_msr = emulator_get_msr, 5289 .check_pmc = emulator_check_pmc, 5290 .read_pmc = emulator_read_pmc, 5291 .halt = emulator_halt, 5292 .wbinvd = emulator_wbinvd, 5293 .fix_hypercall = emulator_fix_hypercall, 5294 .get_fpu = emulator_get_fpu, 5295 .put_fpu = emulator_put_fpu, 5296 .intercept = emulator_intercept, 5297 .get_cpuid = emulator_get_cpuid, 5298 .set_nmi_mask = emulator_set_nmi_mask, 5299 .get_hflags = emulator_get_hflags, 5300 .set_hflags = emulator_set_hflags, 5301 }; 5302 5303 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) 5304 { 5305 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu); 5306 /* 5307 * an sti; sti; sequence only disable interrupts for the first 5308 * instruction. So, if the last instruction, be it emulated or 5309 * not, left the system with the INT_STI flag enabled, it 5310 * means that the last instruction is an sti. We should not 5311 * leave the flag on in this case. The same goes for mov ss 5312 */ 5313 if (int_shadow & mask) 5314 mask = 0; 5315 if (unlikely(int_shadow || mask)) { 5316 kvm_x86_ops->set_interrupt_shadow(vcpu, mask); 5317 if (!mask) 5318 kvm_make_request(KVM_REQ_EVENT, vcpu); 5319 } 5320 } 5321 5322 static bool inject_emulated_exception(struct kvm_vcpu *vcpu) 5323 { 5324 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5325 if (ctxt->exception.vector == PF_VECTOR) 5326 return kvm_propagate_fault(vcpu, &ctxt->exception); 5327 5328 if (ctxt->exception.error_code_valid) 5329 kvm_queue_exception_e(vcpu, ctxt->exception.vector, 5330 ctxt->exception.error_code); 5331 else 5332 kvm_queue_exception(vcpu, ctxt->exception.vector); 5333 return false; 5334 } 5335 5336 static void init_emulate_ctxt(struct kvm_vcpu *vcpu) 5337 { 5338 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5339 int cs_db, cs_l; 5340 5341 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); 5342 5343 ctxt->eflags = kvm_get_rflags(vcpu); 5344 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0; 5345 5346 ctxt->eip = kvm_rip_read(vcpu); 5347 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : 5348 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : 5349 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 : 5350 cs_db ? X86EMUL_MODE_PROT32 : 5351 X86EMUL_MODE_PROT16; 5352 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK); 5353 BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); 5354 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK); 5355 5356 init_decode_cache(ctxt); 5357 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 5358 } 5359 5360 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) 5361 { 5362 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5363 int ret; 5364 5365 init_emulate_ctxt(vcpu); 5366 5367 ctxt->op_bytes = 2; 5368 ctxt->ad_bytes = 2; 5369 ctxt->_eip = ctxt->eip + inc_eip; 5370 ret = emulate_int_real(ctxt, irq); 5371 5372 if (ret != X86EMUL_CONTINUE) 5373 return EMULATE_FAIL; 5374 5375 ctxt->eip = ctxt->_eip; 5376 kvm_rip_write(vcpu, ctxt->eip); 5377 kvm_set_rflags(vcpu, ctxt->eflags); 5378 5379 if (irq == NMI_VECTOR) 5380 vcpu->arch.nmi_pending = 0; 5381 else 5382 vcpu->arch.interrupt.pending = false; 5383 5384 return EMULATE_DONE; 5385 } 5386 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt); 5387 5388 static int handle_emulation_failure(struct kvm_vcpu *vcpu) 5389 { 5390 int r = EMULATE_DONE; 5391 5392 ++vcpu->stat.insn_emulation_fail; 5393 trace_kvm_emulate_insn_failed(vcpu); 5394 if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) { 5395 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 5396 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 5397 vcpu->run->internal.ndata = 0; 5398 r = EMULATE_FAIL; 5399 } 5400 kvm_queue_exception(vcpu, UD_VECTOR); 5401 5402 return r; 5403 } 5404 5405 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2, 5406 bool write_fault_to_shadow_pgtable, 5407 int emulation_type) 5408 { 5409 gpa_t gpa = cr2; 5410 kvm_pfn_t pfn; 5411 5412 if (emulation_type & EMULTYPE_NO_REEXECUTE) 5413 return false; 5414 5415 if (!vcpu->arch.mmu.direct_map) { 5416 /* 5417 * Write permission should be allowed since only 5418 * write access need to be emulated. 5419 */ 5420 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 5421 5422 /* 5423 * If the mapping is invalid in guest, let cpu retry 5424 * it to generate fault. 5425 */ 5426 if (gpa == UNMAPPED_GVA) 5427 return true; 5428 } 5429 5430 /* 5431 * Do not retry the unhandleable instruction if it faults on the 5432 * readonly host memory, otherwise it will goto a infinite loop: 5433 * retry instruction -> write #PF -> emulation fail -> retry 5434 * instruction -> ... 5435 */ 5436 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); 5437 5438 /* 5439 * If the instruction failed on the error pfn, it can not be fixed, 5440 * report the error to userspace. 5441 */ 5442 if (is_error_noslot_pfn(pfn)) 5443 return false; 5444 5445 kvm_release_pfn_clean(pfn); 5446 5447 /* The instructions are well-emulated on direct mmu. */ 5448 if (vcpu->arch.mmu.direct_map) { 5449 unsigned int indirect_shadow_pages; 5450 5451 spin_lock(&vcpu->kvm->mmu_lock); 5452 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; 5453 spin_unlock(&vcpu->kvm->mmu_lock); 5454 5455 if (indirect_shadow_pages) 5456 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5457 5458 return true; 5459 } 5460 5461 /* 5462 * if emulation was due to access to shadowed page table 5463 * and it failed try to unshadow page and re-enter the 5464 * guest to let CPU execute the instruction. 5465 */ 5466 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5467 5468 /* 5469 * If the access faults on its page table, it can not 5470 * be fixed by unprotecting shadow page and it should 5471 * be reported to userspace. 5472 */ 5473 return !write_fault_to_shadow_pgtable; 5474 } 5475 5476 static bool retry_instruction(struct x86_emulate_ctxt *ctxt, 5477 unsigned long cr2, int emulation_type) 5478 { 5479 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 5480 unsigned long last_retry_eip, last_retry_addr, gpa = cr2; 5481 5482 last_retry_eip = vcpu->arch.last_retry_eip; 5483 last_retry_addr = vcpu->arch.last_retry_addr; 5484 5485 /* 5486 * If the emulation is caused by #PF and it is non-page_table 5487 * writing instruction, it means the VM-EXIT is caused by shadow 5488 * page protected, we can zap the shadow page and retry this 5489 * instruction directly. 5490 * 5491 * Note: if the guest uses a non-page-table modifying instruction 5492 * on the PDE that points to the instruction, then we will unmap 5493 * the instruction and go to an infinite loop. So, we cache the 5494 * last retried eip and the last fault address, if we meet the eip 5495 * and the address again, we can break out of the potential infinite 5496 * loop. 5497 */ 5498 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0; 5499 5500 if (!(emulation_type & EMULTYPE_RETRY)) 5501 return false; 5502 5503 if (x86_page_table_writing_insn(ctxt)) 5504 return false; 5505 5506 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2) 5507 return false; 5508 5509 vcpu->arch.last_retry_eip = ctxt->eip; 5510 vcpu->arch.last_retry_addr = cr2; 5511 5512 if (!vcpu->arch.mmu.direct_map) 5513 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); 5514 5515 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); 5516 5517 return true; 5518 } 5519 5520 static int complete_emulated_mmio(struct kvm_vcpu *vcpu); 5521 static int complete_emulated_pio(struct kvm_vcpu *vcpu); 5522 5523 static void kvm_smm_changed(struct kvm_vcpu *vcpu) 5524 { 5525 if (!(vcpu->arch.hflags & HF_SMM_MASK)) { 5526 /* This is a good place to trace that we are exiting SMM. */ 5527 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, false); 5528 5529 /* Process a latched INIT or SMI, if any. */ 5530 kvm_make_request(KVM_REQ_EVENT, vcpu); 5531 } 5532 5533 kvm_mmu_reset_context(vcpu); 5534 } 5535 5536 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags) 5537 { 5538 unsigned changed = vcpu->arch.hflags ^ emul_flags; 5539 5540 vcpu->arch.hflags = emul_flags; 5541 5542 if (changed & HF_SMM_MASK) 5543 kvm_smm_changed(vcpu); 5544 } 5545 5546 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7, 5547 unsigned long *db) 5548 { 5549 u32 dr6 = 0; 5550 int i; 5551 u32 enable, rwlen; 5552 5553 enable = dr7; 5554 rwlen = dr7 >> 16; 5555 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4) 5556 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr) 5557 dr6 |= (1 << i); 5558 return dr6; 5559 } 5560 5561 static void kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu, int *r) 5562 { 5563 struct kvm_run *kvm_run = vcpu->run; 5564 5565 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) { 5566 kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 | DR6_RTM; 5567 kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip; 5568 kvm_run->debug.arch.exception = DB_VECTOR; 5569 kvm_run->exit_reason = KVM_EXIT_DEBUG; 5570 *r = EMULATE_USER_EXIT; 5571 } else { 5572 /* 5573 * "Certain debug exceptions may clear bit 0-3. The 5574 * remaining contents of the DR6 register are never 5575 * cleared by the processor". 5576 */ 5577 vcpu->arch.dr6 &= ~15; 5578 vcpu->arch.dr6 |= DR6_BS | DR6_RTM; 5579 kvm_queue_exception(vcpu, DB_VECTOR); 5580 } 5581 } 5582 5583 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu) 5584 { 5585 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 5586 int r = EMULATE_DONE; 5587 5588 kvm_x86_ops->skip_emulated_instruction(vcpu); 5589 5590 /* 5591 * rflags is the old, "raw" value of the flags. The new value has 5592 * not been saved yet. 5593 * 5594 * This is correct even for TF set by the guest, because "the 5595 * processor will not generate this exception after the instruction 5596 * that sets the TF flag". 5597 */ 5598 if (unlikely(rflags & X86_EFLAGS_TF)) 5599 kvm_vcpu_do_singlestep(vcpu, &r); 5600 return r == EMULATE_DONE; 5601 } 5602 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction); 5603 5604 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) 5605 { 5606 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) && 5607 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) { 5608 struct kvm_run *kvm_run = vcpu->run; 5609 unsigned long eip = kvm_get_linear_rip(vcpu); 5610 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 5611 vcpu->arch.guest_debug_dr7, 5612 vcpu->arch.eff_db); 5613 5614 if (dr6 != 0) { 5615 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM; 5616 kvm_run->debug.arch.pc = eip; 5617 kvm_run->debug.arch.exception = DB_VECTOR; 5618 kvm_run->exit_reason = KVM_EXIT_DEBUG; 5619 *r = EMULATE_USER_EXIT; 5620 return true; 5621 } 5622 } 5623 5624 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) && 5625 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) { 5626 unsigned long eip = kvm_get_linear_rip(vcpu); 5627 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0, 5628 vcpu->arch.dr7, 5629 vcpu->arch.db); 5630 5631 if (dr6 != 0) { 5632 vcpu->arch.dr6 &= ~15; 5633 vcpu->arch.dr6 |= dr6 | DR6_RTM; 5634 kvm_queue_exception(vcpu, DB_VECTOR); 5635 *r = EMULATE_DONE; 5636 return true; 5637 } 5638 } 5639 5640 return false; 5641 } 5642 5643 int x86_emulate_instruction(struct kvm_vcpu *vcpu, 5644 unsigned long cr2, 5645 int emulation_type, 5646 void *insn, 5647 int insn_len) 5648 { 5649 int r; 5650 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 5651 bool writeback = true; 5652 bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable; 5653 5654 /* 5655 * Clear write_fault_to_shadow_pgtable here to ensure it is 5656 * never reused. 5657 */ 5658 vcpu->arch.write_fault_to_shadow_pgtable = false; 5659 kvm_clear_exception_queue(vcpu); 5660 5661 if (!(emulation_type & EMULTYPE_NO_DECODE)) { 5662 init_emulate_ctxt(vcpu); 5663 5664 /* 5665 * We will reenter on the same instruction since 5666 * we do not set complete_userspace_io. This does not 5667 * handle watchpoints yet, those would be handled in 5668 * the emulate_ops. 5669 */ 5670 if (kvm_vcpu_check_breakpoint(vcpu, &r)) 5671 return r; 5672 5673 ctxt->interruptibility = 0; 5674 ctxt->have_exception = false; 5675 ctxt->exception.vector = -1; 5676 ctxt->perm_ok = false; 5677 5678 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD; 5679 5680 r = x86_decode_insn(ctxt, insn, insn_len); 5681 5682 trace_kvm_emulate_insn_start(vcpu); 5683 ++vcpu->stat.insn_emulation; 5684 if (r != EMULATION_OK) { 5685 if (emulation_type & EMULTYPE_TRAP_UD) 5686 return EMULATE_FAIL; 5687 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 5688 emulation_type)) 5689 return EMULATE_DONE; 5690 if (emulation_type & EMULTYPE_SKIP) 5691 return EMULATE_FAIL; 5692 return handle_emulation_failure(vcpu); 5693 } 5694 } 5695 5696 if (emulation_type & EMULTYPE_SKIP) { 5697 kvm_rip_write(vcpu, ctxt->_eip); 5698 if (ctxt->eflags & X86_EFLAGS_RF) 5699 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF); 5700 return EMULATE_DONE; 5701 } 5702 5703 if (retry_instruction(ctxt, cr2, emulation_type)) 5704 return EMULATE_DONE; 5705 5706 /* this is needed for vmware backdoor interface to work since it 5707 changes registers values during IO operation */ 5708 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { 5709 vcpu->arch.emulate_regs_need_sync_from_vcpu = false; 5710 emulator_invalidate_register_cache(ctxt); 5711 } 5712 5713 restart: 5714 /* Save the faulting GPA (cr2) in the address field */ 5715 ctxt->exception.address = cr2; 5716 5717 r = x86_emulate_insn(ctxt); 5718 5719 if (r == EMULATION_INTERCEPTED) 5720 return EMULATE_DONE; 5721 5722 if (r == EMULATION_FAILED) { 5723 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt, 5724 emulation_type)) 5725 return EMULATE_DONE; 5726 5727 return handle_emulation_failure(vcpu); 5728 } 5729 5730 if (ctxt->have_exception) { 5731 r = EMULATE_DONE; 5732 if (inject_emulated_exception(vcpu)) 5733 return r; 5734 } else if (vcpu->arch.pio.count) { 5735 if (!vcpu->arch.pio.in) { 5736 /* FIXME: return into emulator if single-stepping. */ 5737 vcpu->arch.pio.count = 0; 5738 } else { 5739 writeback = false; 5740 vcpu->arch.complete_userspace_io = complete_emulated_pio; 5741 } 5742 r = EMULATE_USER_EXIT; 5743 } else if (vcpu->mmio_needed) { 5744 if (!vcpu->mmio_is_write) 5745 writeback = false; 5746 r = EMULATE_USER_EXIT; 5747 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 5748 } else if (r == EMULATION_RESTART) 5749 goto restart; 5750 else 5751 r = EMULATE_DONE; 5752 5753 if (writeback) { 5754 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu); 5755 toggle_interruptibility(vcpu, ctxt->interruptibility); 5756 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 5757 kvm_rip_write(vcpu, ctxt->eip); 5758 if (r == EMULATE_DONE && 5759 (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP))) 5760 kvm_vcpu_do_singlestep(vcpu, &r); 5761 if (!ctxt->have_exception || 5762 exception_type(ctxt->exception.vector) == EXCPT_TRAP) 5763 __kvm_set_rflags(vcpu, ctxt->eflags); 5764 5765 /* 5766 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will 5767 * do nothing, and it will be requested again as soon as 5768 * the shadow expires. But we still need to check here, 5769 * because POPF has no interrupt shadow. 5770 */ 5771 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF)) 5772 kvm_make_request(KVM_REQ_EVENT, vcpu); 5773 } else 5774 vcpu->arch.emulate_regs_need_sync_to_vcpu = true; 5775 5776 return r; 5777 } 5778 EXPORT_SYMBOL_GPL(x86_emulate_instruction); 5779 5780 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port) 5781 { 5782 unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX); 5783 int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt, 5784 size, port, &val, 1); 5785 /* do not return to emulator after return from userspace */ 5786 vcpu->arch.pio.count = 0; 5787 return ret; 5788 } 5789 EXPORT_SYMBOL_GPL(kvm_fast_pio_out); 5790 5791 static int complete_fast_pio_in(struct kvm_vcpu *vcpu) 5792 { 5793 unsigned long val; 5794 5795 /* We should only ever be called with arch.pio.count equal to 1 */ 5796 BUG_ON(vcpu->arch.pio.count != 1); 5797 5798 /* For size less than 4 we merge, else we zero extend */ 5799 val = (vcpu->arch.pio.size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX) 5800 : 0; 5801 5802 /* 5803 * Since vcpu->arch.pio.count == 1 let emulator_pio_in_emulated perform 5804 * the copy and tracing 5805 */ 5806 emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, vcpu->arch.pio.size, 5807 vcpu->arch.pio.port, &val, 1); 5808 kvm_register_write(vcpu, VCPU_REGS_RAX, val); 5809 5810 return 1; 5811 } 5812 5813 int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port) 5814 { 5815 unsigned long val; 5816 int ret; 5817 5818 /* For size less than 4 we merge, else we zero extend */ 5819 val = (size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX) : 0; 5820 5821 ret = emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, size, port, 5822 &val, 1); 5823 if (ret) { 5824 kvm_register_write(vcpu, VCPU_REGS_RAX, val); 5825 return ret; 5826 } 5827 5828 vcpu->arch.complete_userspace_io = complete_fast_pio_in; 5829 5830 return 0; 5831 } 5832 EXPORT_SYMBOL_GPL(kvm_fast_pio_in); 5833 5834 static int kvmclock_cpu_down_prep(unsigned int cpu) 5835 { 5836 __this_cpu_write(cpu_tsc_khz, 0); 5837 return 0; 5838 } 5839 5840 static void tsc_khz_changed(void *data) 5841 { 5842 struct cpufreq_freqs *freq = data; 5843 unsigned long khz = 0; 5844 5845 if (data) 5846 khz = freq->new; 5847 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 5848 khz = cpufreq_quick_get(raw_smp_processor_id()); 5849 if (!khz) 5850 khz = tsc_khz; 5851 __this_cpu_write(cpu_tsc_khz, khz); 5852 } 5853 5854 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, 5855 void *data) 5856 { 5857 struct cpufreq_freqs *freq = data; 5858 struct kvm *kvm; 5859 struct kvm_vcpu *vcpu; 5860 int i, send_ipi = 0; 5861 5862 /* 5863 * We allow guests to temporarily run on slowing clocks, 5864 * provided we notify them after, or to run on accelerating 5865 * clocks, provided we notify them before. Thus time never 5866 * goes backwards. 5867 * 5868 * However, we have a problem. We can't atomically update 5869 * the frequency of a given CPU from this function; it is 5870 * merely a notifier, which can be called from any CPU. 5871 * Changing the TSC frequency at arbitrary points in time 5872 * requires a recomputation of local variables related to 5873 * the TSC for each VCPU. We must flag these local variables 5874 * to be updated and be sure the update takes place with the 5875 * new frequency before any guests proceed. 5876 * 5877 * Unfortunately, the combination of hotplug CPU and frequency 5878 * change creates an intractable locking scenario; the order 5879 * of when these callouts happen is undefined with respect to 5880 * CPU hotplug, and they can race with each other. As such, 5881 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is 5882 * undefined; you can actually have a CPU frequency change take 5883 * place in between the computation of X and the setting of the 5884 * variable. To protect against this problem, all updates of 5885 * the per_cpu tsc_khz variable are done in an interrupt 5886 * protected IPI, and all callers wishing to update the value 5887 * must wait for a synchronous IPI to complete (which is trivial 5888 * if the caller is on the CPU already). This establishes the 5889 * necessary total order on variable updates. 5890 * 5891 * Note that because a guest time update may take place 5892 * anytime after the setting of the VCPU's request bit, the 5893 * correct TSC value must be set before the request. However, 5894 * to ensure the update actually makes it to any guest which 5895 * starts running in hardware virtualization between the set 5896 * and the acquisition of the spinlock, we must also ping the 5897 * CPU after setting the request bit. 5898 * 5899 */ 5900 5901 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) 5902 return 0; 5903 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) 5904 return 0; 5905 5906 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); 5907 5908 spin_lock(&kvm_lock); 5909 list_for_each_entry(kvm, &vm_list, vm_list) { 5910 kvm_for_each_vcpu(i, vcpu, kvm) { 5911 if (vcpu->cpu != freq->cpu) 5912 continue; 5913 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 5914 if (vcpu->cpu != smp_processor_id()) 5915 send_ipi = 1; 5916 } 5917 } 5918 spin_unlock(&kvm_lock); 5919 5920 if (freq->old < freq->new && send_ipi) { 5921 /* 5922 * We upscale the frequency. Must make the guest 5923 * doesn't see old kvmclock values while running with 5924 * the new frequency, otherwise we risk the guest sees 5925 * time go backwards. 5926 * 5927 * In case we update the frequency for another cpu 5928 * (which might be in guest context) send an interrupt 5929 * to kick the cpu out of guest context. Next time 5930 * guest context is entered kvmclock will be updated, 5931 * so the guest will not see stale values. 5932 */ 5933 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); 5934 } 5935 return 0; 5936 } 5937 5938 static struct notifier_block kvmclock_cpufreq_notifier_block = { 5939 .notifier_call = kvmclock_cpufreq_notifier 5940 }; 5941 5942 static int kvmclock_cpu_online(unsigned int cpu) 5943 { 5944 tsc_khz_changed(NULL); 5945 return 0; 5946 } 5947 5948 static void kvm_timer_init(void) 5949 { 5950 max_tsc_khz = tsc_khz; 5951 5952 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { 5953 #ifdef CONFIG_CPU_FREQ 5954 struct cpufreq_policy policy; 5955 int cpu; 5956 5957 memset(&policy, 0, sizeof(policy)); 5958 cpu = get_cpu(); 5959 cpufreq_get_policy(&policy, cpu); 5960 if (policy.cpuinfo.max_freq) 5961 max_tsc_khz = policy.cpuinfo.max_freq; 5962 put_cpu(); 5963 #endif 5964 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, 5965 CPUFREQ_TRANSITION_NOTIFIER); 5966 } 5967 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz); 5968 5969 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", 5970 kvmclock_cpu_online, kvmclock_cpu_down_prep); 5971 } 5972 5973 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); 5974 5975 int kvm_is_in_guest(void) 5976 { 5977 return __this_cpu_read(current_vcpu) != NULL; 5978 } 5979 5980 static int kvm_is_user_mode(void) 5981 { 5982 int user_mode = 3; 5983 5984 if (__this_cpu_read(current_vcpu)) 5985 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu)); 5986 5987 return user_mode != 0; 5988 } 5989 5990 static unsigned long kvm_get_guest_ip(void) 5991 { 5992 unsigned long ip = 0; 5993 5994 if (__this_cpu_read(current_vcpu)) 5995 ip = kvm_rip_read(__this_cpu_read(current_vcpu)); 5996 5997 return ip; 5998 } 5999 6000 static struct perf_guest_info_callbacks kvm_guest_cbs = { 6001 .is_in_guest = kvm_is_in_guest, 6002 .is_user_mode = kvm_is_user_mode, 6003 .get_guest_ip = kvm_get_guest_ip, 6004 }; 6005 6006 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu) 6007 { 6008 __this_cpu_write(current_vcpu, vcpu); 6009 } 6010 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi); 6011 6012 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu) 6013 { 6014 __this_cpu_write(current_vcpu, NULL); 6015 } 6016 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi); 6017 6018 static void kvm_set_mmio_spte_mask(void) 6019 { 6020 u64 mask; 6021 int maxphyaddr = boot_cpu_data.x86_phys_bits; 6022 6023 /* 6024 * Set the reserved bits and the present bit of an paging-structure 6025 * entry to generate page fault with PFER.RSV = 1. 6026 */ 6027 /* Mask the reserved physical address bits. */ 6028 mask = rsvd_bits(maxphyaddr, 51); 6029 6030 /* Set the present bit. */ 6031 mask |= 1ull; 6032 6033 #ifdef CONFIG_X86_64 6034 /* 6035 * If reserved bit is not supported, clear the present bit to disable 6036 * mmio page fault. 6037 */ 6038 if (maxphyaddr == 52) 6039 mask &= ~1ull; 6040 #endif 6041 6042 kvm_mmu_set_mmio_spte_mask(mask, mask); 6043 } 6044 6045 #ifdef CONFIG_X86_64 6046 static void pvclock_gtod_update_fn(struct work_struct *work) 6047 { 6048 struct kvm *kvm; 6049 6050 struct kvm_vcpu *vcpu; 6051 int i; 6052 6053 spin_lock(&kvm_lock); 6054 list_for_each_entry(kvm, &vm_list, vm_list) 6055 kvm_for_each_vcpu(i, vcpu, kvm) 6056 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 6057 atomic_set(&kvm_guest_has_master_clock, 0); 6058 spin_unlock(&kvm_lock); 6059 } 6060 6061 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn); 6062 6063 /* 6064 * Notification about pvclock gtod data update. 6065 */ 6066 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused, 6067 void *priv) 6068 { 6069 struct pvclock_gtod_data *gtod = &pvclock_gtod_data; 6070 struct timekeeper *tk = priv; 6071 6072 update_pvclock_gtod(tk); 6073 6074 /* disable master clock if host does not trust, or does not 6075 * use, TSC clocksource 6076 */ 6077 if (gtod->clock.vclock_mode != VCLOCK_TSC && 6078 atomic_read(&kvm_guest_has_master_clock) != 0) 6079 queue_work(system_long_wq, &pvclock_gtod_work); 6080 6081 return 0; 6082 } 6083 6084 static struct notifier_block pvclock_gtod_notifier = { 6085 .notifier_call = pvclock_gtod_notify, 6086 }; 6087 #endif 6088 6089 int kvm_arch_init(void *opaque) 6090 { 6091 int r; 6092 struct kvm_x86_ops *ops = opaque; 6093 6094 if (kvm_x86_ops) { 6095 printk(KERN_ERR "kvm: already loaded the other module\n"); 6096 r = -EEXIST; 6097 goto out; 6098 } 6099 6100 if (!ops->cpu_has_kvm_support()) { 6101 printk(KERN_ERR "kvm: no hardware support\n"); 6102 r = -EOPNOTSUPP; 6103 goto out; 6104 } 6105 if (ops->disabled_by_bios()) { 6106 printk(KERN_ERR "kvm: disabled by bios\n"); 6107 r = -EOPNOTSUPP; 6108 goto out; 6109 } 6110 6111 r = -ENOMEM; 6112 shared_msrs = alloc_percpu(struct kvm_shared_msrs); 6113 if (!shared_msrs) { 6114 printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n"); 6115 goto out; 6116 } 6117 6118 r = kvm_mmu_module_init(); 6119 if (r) 6120 goto out_free_percpu; 6121 6122 kvm_set_mmio_spte_mask(); 6123 6124 kvm_x86_ops = ops; 6125 6126 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, 6127 PT_DIRTY_MASK, PT64_NX_MASK, 0, 6128 PT_PRESENT_MASK, 0); 6129 kvm_timer_init(); 6130 6131 perf_register_guest_info_callbacks(&kvm_guest_cbs); 6132 6133 if (boot_cpu_has(X86_FEATURE_XSAVE)) 6134 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); 6135 6136 kvm_lapic_init(); 6137 #ifdef CONFIG_X86_64 6138 pvclock_gtod_register_notifier(&pvclock_gtod_notifier); 6139 #endif 6140 6141 return 0; 6142 6143 out_free_percpu: 6144 free_percpu(shared_msrs); 6145 out: 6146 return r; 6147 } 6148 6149 void kvm_arch_exit(void) 6150 { 6151 kvm_lapic_exit(); 6152 perf_unregister_guest_info_callbacks(&kvm_guest_cbs); 6153 6154 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) 6155 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, 6156 CPUFREQ_TRANSITION_NOTIFIER); 6157 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); 6158 #ifdef CONFIG_X86_64 6159 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); 6160 #endif 6161 kvm_x86_ops = NULL; 6162 kvm_mmu_module_exit(); 6163 free_percpu(shared_msrs); 6164 } 6165 6166 int kvm_vcpu_halt(struct kvm_vcpu *vcpu) 6167 { 6168 ++vcpu->stat.halt_exits; 6169 if (lapic_in_kernel(vcpu)) { 6170 vcpu->arch.mp_state = KVM_MP_STATE_HALTED; 6171 return 1; 6172 } else { 6173 vcpu->run->exit_reason = KVM_EXIT_HLT; 6174 return 0; 6175 } 6176 } 6177 EXPORT_SYMBOL_GPL(kvm_vcpu_halt); 6178 6179 int kvm_emulate_halt(struct kvm_vcpu *vcpu) 6180 { 6181 int ret = kvm_skip_emulated_instruction(vcpu); 6182 /* 6183 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered 6184 * KVM_EXIT_DEBUG here. 6185 */ 6186 return kvm_vcpu_halt(vcpu) && ret; 6187 } 6188 EXPORT_SYMBOL_GPL(kvm_emulate_halt); 6189 6190 #ifdef CONFIG_X86_64 6191 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr, 6192 unsigned long clock_type) 6193 { 6194 struct kvm_clock_pairing clock_pairing; 6195 struct timespec ts; 6196 u64 cycle; 6197 int ret; 6198 6199 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK) 6200 return -KVM_EOPNOTSUPP; 6201 6202 if (kvm_get_walltime_and_clockread(&ts, &cycle) == false) 6203 return -KVM_EOPNOTSUPP; 6204 6205 clock_pairing.sec = ts.tv_sec; 6206 clock_pairing.nsec = ts.tv_nsec; 6207 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle); 6208 clock_pairing.flags = 0; 6209 6210 ret = 0; 6211 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing, 6212 sizeof(struct kvm_clock_pairing))) 6213 ret = -KVM_EFAULT; 6214 6215 return ret; 6216 } 6217 #endif 6218 6219 /* 6220 * kvm_pv_kick_cpu_op: Kick a vcpu. 6221 * 6222 * @apicid - apicid of vcpu to be kicked. 6223 */ 6224 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) 6225 { 6226 struct kvm_lapic_irq lapic_irq; 6227 6228 lapic_irq.shorthand = 0; 6229 lapic_irq.dest_mode = 0; 6230 lapic_irq.level = 0; 6231 lapic_irq.dest_id = apicid; 6232 lapic_irq.msi_redir_hint = false; 6233 6234 lapic_irq.delivery_mode = APIC_DM_REMRD; 6235 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); 6236 } 6237 6238 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu) 6239 { 6240 vcpu->arch.apicv_active = false; 6241 kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu); 6242 } 6243 6244 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) 6245 { 6246 unsigned long nr, a0, a1, a2, a3, ret; 6247 int op_64_bit, r; 6248 6249 r = kvm_skip_emulated_instruction(vcpu); 6250 6251 if (kvm_hv_hypercall_enabled(vcpu->kvm)) 6252 return kvm_hv_hypercall(vcpu); 6253 6254 nr = kvm_register_read(vcpu, VCPU_REGS_RAX); 6255 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX); 6256 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX); 6257 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX); 6258 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI); 6259 6260 trace_kvm_hypercall(nr, a0, a1, a2, a3); 6261 6262 op_64_bit = is_64_bit_mode(vcpu); 6263 if (!op_64_bit) { 6264 nr &= 0xFFFFFFFF; 6265 a0 &= 0xFFFFFFFF; 6266 a1 &= 0xFFFFFFFF; 6267 a2 &= 0xFFFFFFFF; 6268 a3 &= 0xFFFFFFFF; 6269 } 6270 6271 if (kvm_x86_ops->get_cpl(vcpu) != 0) { 6272 ret = -KVM_EPERM; 6273 goto out; 6274 } 6275 6276 switch (nr) { 6277 case KVM_HC_VAPIC_POLL_IRQ: 6278 ret = 0; 6279 break; 6280 case KVM_HC_KICK_CPU: 6281 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1); 6282 ret = 0; 6283 break; 6284 #ifdef CONFIG_X86_64 6285 case KVM_HC_CLOCK_PAIRING: 6286 ret = kvm_pv_clock_pairing(vcpu, a0, a1); 6287 break; 6288 #endif 6289 default: 6290 ret = -KVM_ENOSYS; 6291 break; 6292 } 6293 out: 6294 if (!op_64_bit) 6295 ret = (u32)ret; 6296 kvm_register_write(vcpu, VCPU_REGS_RAX, ret); 6297 ++vcpu->stat.hypercalls; 6298 return r; 6299 } 6300 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); 6301 6302 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) 6303 { 6304 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); 6305 char instruction[3]; 6306 unsigned long rip = kvm_rip_read(vcpu); 6307 6308 kvm_x86_ops->patch_hypercall(vcpu, instruction); 6309 6310 return emulator_write_emulated(ctxt, rip, instruction, 3, 6311 &ctxt->exception); 6312 } 6313 6314 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) 6315 { 6316 return vcpu->run->request_interrupt_window && 6317 likely(!pic_in_kernel(vcpu->kvm)); 6318 } 6319 6320 static void post_kvm_run_save(struct kvm_vcpu *vcpu) 6321 { 6322 struct kvm_run *kvm_run = vcpu->run; 6323 6324 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; 6325 kvm_run->flags = is_smm(vcpu) ? KVM_RUN_X86_SMM : 0; 6326 kvm_run->cr8 = kvm_get_cr8(vcpu); 6327 kvm_run->apic_base = kvm_get_apic_base(vcpu); 6328 kvm_run->ready_for_interrupt_injection = 6329 pic_in_kernel(vcpu->kvm) || 6330 kvm_vcpu_ready_for_interrupt_injection(vcpu); 6331 } 6332 6333 static void update_cr8_intercept(struct kvm_vcpu *vcpu) 6334 { 6335 int max_irr, tpr; 6336 6337 if (!kvm_x86_ops->update_cr8_intercept) 6338 return; 6339 6340 if (!lapic_in_kernel(vcpu)) 6341 return; 6342 6343 if (vcpu->arch.apicv_active) 6344 return; 6345 6346 if (!vcpu->arch.apic->vapic_addr) 6347 max_irr = kvm_lapic_find_highest_irr(vcpu); 6348 else 6349 max_irr = -1; 6350 6351 if (max_irr != -1) 6352 max_irr >>= 4; 6353 6354 tpr = kvm_lapic_get_cr8(vcpu); 6355 6356 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr); 6357 } 6358 6359 static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win) 6360 { 6361 int r; 6362 6363 /* try to reinject previous events if any */ 6364 if (vcpu->arch.exception.pending) { 6365 trace_kvm_inj_exception(vcpu->arch.exception.nr, 6366 vcpu->arch.exception.has_error_code, 6367 vcpu->arch.exception.error_code); 6368 6369 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT) 6370 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) | 6371 X86_EFLAGS_RF); 6372 6373 if (vcpu->arch.exception.nr == DB_VECTOR && 6374 (vcpu->arch.dr7 & DR7_GD)) { 6375 vcpu->arch.dr7 &= ~DR7_GD; 6376 kvm_update_dr7(vcpu); 6377 } 6378 6379 kvm_x86_ops->queue_exception(vcpu); 6380 return 0; 6381 } 6382 6383 if (vcpu->arch.nmi_injected) { 6384 kvm_x86_ops->set_nmi(vcpu); 6385 return 0; 6386 } 6387 6388 if (vcpu->arch.interrupt.pending) { 6389 kvm_x86_ops->set_irq(vcpu); 6390 return 0; 6391 } 6392 6393 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 6394 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 6395 if (r != 0) 6396 return r; 6397 } 6398 6399 /* try to inject new event if pending */ 6400 if (vcpu->arch.smi_pending && !is_smm(vcpu)) { 6401 vcpu->arch.smi_pending = false; 6402 enter_smm(vcpu); 6403 } else if (vcpu->arch.nmi_pending && kvm_x86_ops->nmi_allowed(vcpu)) { 6404 --vcpu->arch.nmi_pending; 6405 vcpu->arch.nmi_injected = true; 6406 kvm_x86_ops->set_nmi(vcpu); 6407 } else if (kvm_cpu_has_injectable_intr(vcpu)) { 6408 /* 6409 * Because interrupts can be injected asynchronously, we are 6410 * calling check_nested_events again here to avoid a race condition. 6411 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this 6412 * proposal and current concerns. Perhaps we should be setting 6413 * KVM_REQ_EVENT only on certain events and not unconditionally? 6414 */ 6415 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) { 6416 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win); 6417 if (r != 0) 6418 return r; 6419 } 6420 if (kvm_x86_ops->interrupt_allowed(vcpu)) { 6421 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), 6422 false); 6423 kvm_x86_ops->set_irq(vcpu); 6424 } 6425 } 6426 6427 return 0; 6428 } 6429 6430 static void process_nmi(struct kvm_vcpu *vcpu) 6431 { 6432 unsigned limit = 2; 6433 6434 /* 6435 * x86 is limited to one NMI running, and one NMI pending after it. 6436 * If an NMI is already in progress, limit further NMIs to just one. 6437 * Otherwise, allow two (and we'll inject the first one immediately). 6438 */ 6439 if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected) 6440 limit = 1; 6441 6442 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0); 6443 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit); 6444 kvm_make_request(KVM_REQ_EVENT, vcpu); 6445 } 6446 6447 #define put_smstate(type, buf, offset, val) \ 6448 *(type *)((buf) + (offset) - 0x7e00) = val 6449 6450 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) 6451 { 6452 u32 flags = 0; 6453 flags |= seg->g << 23; 6454 flags |= seg->db << 22; 6455 flags |= seg->l << 21; 6456 flags |= seg->avl << 20; 6457 flags |= seg->present << 15; 6458 flags |= seg->dpl << 13; 6459 flags |= seg->s << 12; 6460 flags |= seg->type << 8; 6461 return flags; 6462 } 6463 6464 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n) 6465 { 6466 struct kvm_segment seg; 6467 int offset; 6468 6469 kvm_get_segment(vcpu, &seg, n); 6470 put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector); 6471 6472 if (n < 3) 6473 offset = 0x7f84 + n * 12; 6474 else 6475 offset = 0x7f2c + (n - 3) * 12; 6476 6477 put_smstate(u32, buf, offset + 8, seg.base); 6478 put_smstate(u32, buf, offset + 4, seg.limit); 6479 put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg)); 6480 } 6481 6482 #ifdef CONFIG_X86_64 6483 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n) 6484 { 6485 struct kvm_segment seg; 6486 int offset; 6487 u16 flags; 6488 6489 kvm_get_segment(vcpu, &seg, n); 6490 offset = 0x7e00 + n * 16; 6491 6492 flags = enter_smm_get_segment_flags(&seg) >> 8; 6493 put_smstate(u16, buf, offset, seg.selector); 6494 put_smstate(u16, buf, offset + 2, flags); 6495 put_smstate(u32, buf, offset + 4, seg.limit); 6496 put_smstate(u64, buf, offset + 8, seg.base); 6497 } 6498 #endif 6499 6500 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf) 6501 { 6502 struct desc_ptr dt; 6503 struct kvm_segment seg; 6504 unsigned long val; 6505 int i; 6506 6507 put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu)); 6508 put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu)); 6509 put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu)); 6510 put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu)); 6511 6512 for (i = 0; i < 8; i++) 6513 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read(vcpu, i)); 6514 6515 kvm_get_dr(vcpu, 6, &val); 6516 put_smstate(u32, buf, 0x7fcc, (u32)val); 6517 kvm_get_dr(vcpu, 7, &val); 6518 put_smstate(u32, buf, 0x7fc8, (u32)val); 6519 6520 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 6521 put_smstate(u32, buf, 0x7fc4, seg.selector); 6522 put_smstate(u32, buf, 0x7f64, seg.base); 6523 put_smstate(u32, buf, 0x7f60, seg.limit); 6524 put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg)); 6525 6526 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 6527 put_smstate(u32, buf, 0x7fc0, seg.selector); 6528 put_smstate(u32, buf, 0x7f80, seg.base); 6529 put_smstate(u32, buf, 0x7f7c, seg.limit); 6530 put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg)); 6531 6532 kvm_x86_ops->get_gdt(vcpu, &dt); 6533 put_smstate(u32, buf, 0x7f74, dt.address); 6534 put_smstate(u32, buf, 0x7f70, dt.size); 6535 6536 kvm_x86_ops->get_idt(vcpu, &dt); 6537 put_smstate(u32, buf, 0x7f58, dt.address); 6538 put_smstate(u32, buf, 0x7f54, dt.size); 6539 6540 for (i = 0; i < 6; i++) 6541 enter_smm_save_seg_32(vcpu, buf, i); 6542 6543 put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu)); 6544 6545 /* revision id */ 6546 put_smstate(u32, buf, 0x7efc, 0x00020000); 6547 put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase); 6548 } 6549 6550 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) 6551 { 6552 #ifdef CONFIG_X86_64 6553 struct desc_ptr dt; 6554 struct kvm_segment seg; 6555 unsigned long val; 6556 int i; 6557 6558 for (i = 0; i < 16; i++) 6559 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read(vcpu, i)); 6560 6561 put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu)); 6562 put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu)); 6563 6564 kvm_get_dr(vcpu, 6, &val); 6565 put_smstate(u64, buf, 0x7f68, val); 6566 kvm_get_dr(vcpu, 7, &val); 6567 put_smstate(u64, buf, 0x7f60, val); 6568 6569 put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu)); 6570 put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu)); 6571 put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu)); 6572 6573 put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase); 6574 6575 /* revision id */ 6576 put_smstate(u32, buf, 0x7efc, 0x00020064); 6577 6578 put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer); 6579 6580 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); 6581 put_smstate(u16, buf, 0x7e90, seg.selector); 6582 put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8); 6583 put_smstate(u32, buf, 0x7e94, seg.limit); 6584 put_smstate(u64, buf, 0x7e98, seg.base); 6585 6586 kvm_x86_ops->get_idt(vcpu, &dt); 6587 put_smstate(u32, buf, 0x7e84, dt.size); 6588 put_smstate(u64, buf, 0x7e88, dt.address); 6589 6590 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); 6591 put_smstate(u16, buf, 0x7e70, seg.selector); 6592 put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8); 6593 put_smstate(u32, buf, 0x7e74, seg.limit); 6594 put_smstate(u64, buf, 0x7e78, seg.base); 6595 6596 kvm_x86_ops->get_gdt(vcpu, &dt); 6597 put_smstate(u32, buf, 0x7e64, dt.size); 6598 put_smstate(u64, buf, 0x7e68, dt.address); 6599 6600 for (i = 0; i < 6; i++) 6601 enter_smm_save_seg_64(vcpu, buf, i); 6602 #else 6603 WARN_ON_ONCE(1); 6604 #endif 6605 } 6606 6607 static void enter_smm(struct kvm_vcpu *vcpu) 6608 { 6609 struct kvm_segment cs, ds; 6610 struct desc_ptr dt; 6611 char buf[512]; 6612 u32 cr0; 6613 6614 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true); 6615 vcpu->arch.hflags |= HF_SMM_MASK; 6616 memset(buf, 0, 512); 6617 if (guest_cpuid_has_longmode(vcpu)) 6618 enter_smm_save_state_64(vcpu, buf); 6619 else 6620 enter_smm_save_state_32(vcpu, buf); 6621 6622 kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); 6623 6624 if (kvm_x86_ops->get_nmi_mask(vcpu)) 6625 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; 6626 else 6627 kvm_x86_ops->set_nmi_mask(vcpu, true); 6628 6629 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); 6630 kvm_rip_write(vcpu, 0x8000); 6631 6632 cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); 6633 kvm_x86_ops->set_cr0(vcpu, cr0); 6634 vcpu->arch.cr0 = cr0; 6635 6636 kvm_x86_ops->set_cr4(vcpu, 0); 6637 6638 /* Undocumented: IDT limit is set to zero on entry to SMM. */ 6639 dt.address = dt.size = 0; 6640 kvm_x86_ops->set_idt(vcpu, &dt); 6641 6642 __kvm_set_dr(vcpu, 7, DR7_FIXED_1); 6643 6644 cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; 6645 cs.base = vcpu->arch.smbase; 6646 6647 ds.selector = 0; 6648 ds.base = 0; 6649 6650 cs.limit = ds.limit = 0xffffffff; 6651 cs.type = ds.type = 0x3; 6652 cs.dpl = ds.dpl = 0; 6653 cs.db = ds.db = 0; 6654 cs.s = ds.s = 1; 6655 cs.l = ds.l = 0; 6656 cs.g = ds.g = 1; 6657 cs.avl = ds.avl = 0; 6658 cs.present = ds.present = 1; 6659 cs.unusable = ds.unusable = 0; 6660 cs.padding = ds.padding = 0; 6661 6662 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 6663 kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); 6664 kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); 6665 kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); 6666 kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); 6667 kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); 6668 6669 if (guest_cpuid_has_longmode(vcpu)) 6670 kvm_x86_ops->set_efer(vcpu, 0); 6671 6672 kvm_update_cpuid(vcpu); 6673 kvm_mmu_reset_context(vcpu); 6674 } 6675 6676 static void process_smi(struct kvm_vcpu *vcpu) 6677 { 6678 vcpu->arch.smi_pending = true; 6679 kvm_make_request(KVM_REQ_EVENT, vcpu); 6680 } 6681 6682 void kvm_make_scan_ioapic_request(struct kvm *kvm) 6683 { 6684 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); 6685 } 6686 6687 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu) 6688 { 6689 u64 eoi_exit_bitmap[4]; 6690 6691 if (!kvm_apic_hw_enabled(vcpu->arch.apic)) 6692 return; 6693 6694 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256); 6695 6696 if (irqchip_split(vcpu->kvm)) 6697 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors); 6698 else { 6699 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active) 6700 kvm_x86_ops->sync_pir_to_irr(vcpu); 6701 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors); 6702 } 6703 bitmap_or((ulong *)eoi_exit_bitmap, vcpu->arch.ioapic_handled_vectors, 6704 vcpu_to_synic(vcpu)->vec_bitmap, 256); 6705 kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap); 6706 } 6707 6708 static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu) 6709 { 6710 ++vcpu->stat.tlb_flush; 6711 kvm_x86_ops->tlb_flush(vcpu); 6712 } 6713 6714 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) 6715 { 6716 struct page *page = NULL; 6717 6718 if (!lapic_in_kernel(vcpu)) 6719 return; 6720 6721 if (!kvm_x86_ops->set_apic_access_page_addr) 6722 return; 6723 6724 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 6725 if (is_error_page(page)) 6726 return; 6727 kvm_x86_ops->set_apic_access_page_addr(vcpu, page_to_phys(page)); 6728 6729 /* 6730 * Do not pin apic access page in memory, the MMU notifier 6731 * will call us again if it is migrated or swapped out. 6732 */ 6733 put_page(page); 6734 } 6735 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page); 6736 6737 void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm, 6738 unsigned long address) 6739 { 6740 /* 6741 * The physical address of apic access page is stored in the VMCS. 6742 * Update it when it becomes invalid. 6743 */ 6744 if (address == gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT)) 6745 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); 6746 } 6747 6748 /* 6749 * Returns 1 to let vcpu_run() continue the guest execution loop without 6750 * exiting to the userspace. Otherwise, the value will be returned to the 6751 * userspace. 6752 */ 6753 static int vcpu_enter_guest(struct kvm_vcpu *vcpu) 6754 { 6755 int r; 6756 bool req_int_win = 6757 dm_request_for_irq_injection(vcpu) && 6758 kvm_cpu_accept_dm_intr(vcpu); 6759 6760 bool req_immediate_exit = false; 6761 6762 if (kvm_request_pending(vcpu)) { 6763 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) 6764 kvm_mmu_unload(vcpu); 6765 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu)) 6766 __kvm_migrate_timers(vcpu); 6767 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu)) 6768 kvm_gen_update_masterclock(vcpu->kvm); 6769 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu)) 6770 kvm_gen_kvmclock_update(vcpu); 6771 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) { 6772 r = kvm_guest_time_update(vcpu); 6773 if (unlikely(r)) 6774 goto out; 6775 } 6776 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) 6777 kvm_mmu_sync_roots(vcpu); 6778 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) 6779 kvm_vcpu_flush_tlb(vcpu); 6780 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { 6781 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; 6782 r = 0; 6783 goto out; 6784 } 6785 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { 6786 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; 6787 r = 0; 6788 goto out; 6789 } 6790 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { 6791 /* Page is swapped out. Do synthetic halt */ 6792 vcpu->arch.apf.halted = true; 6793 r = 1; 6794 goto out; 6795 } 6796 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) 6797 record_steal_time(vcpu); 6798 if (kvm_check_request(KVM_REQ_SMI, vcpu)) 6799 process_smi(vcpu); 6800 if (kvm_check_request(KVM_REQ_NMI, vcpu)) 6801 process_nmi(vcpu); 6802 if (kvm_check_request(KVM_REQ_PMU, vcpu)) 6803 kvm_pmu_handle_event(vcpu); 6804 if (kvm_check_request(KVM_REQ_PMI, vcpu)) 6805 kvm_pmu_deliver_pmi(vcpu); 6806 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) { 6807 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255); 6808 if (test_bit(vcpu->arch.pending_ioapic_eoi, 6809 vcpu->arch.ioapic_handled_vectors)) { 6810 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI; 6811 vcpu->run->eoi.vector = 6812 vcpu->arch.pending_ioapic_eoi; 6813 r = 0; 6814 goto out; 6815 } 6816 } 6817 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu)) 6818 vcpu_scan_ioapic(vcpu); 6819 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu)) 6820 kvm_vcpu_reload_apic_access_page(vcpu); 6821 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) { 6822 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 6823 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH; 6824 r = 0; 6825 goto out; 6826 } 6827 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) { 6828 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 6829 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET; 6830 r = 0; 6831 goto out; 6832 } 6833 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) { 6834 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 6835 vcpu->run->hyperv = vcpu->arch.hyperv.exit; 6836 r = 0; 6837 goto out; 6838 } 6839 6840 /* 6841 * KVM_REQ_HV_STIMER has to be processed after 6842 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers 6843 * depend on the guest clock being up-to-date 6844 */ 6845 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu)) 6846 kvm_hv_process_stimers(vcpu); 6847 } 6848 6849 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) { 6850 ++vcpu->stat.req_event; 6851 kvm_apic_accept_events(vcpu); 6852 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { 6853 r = 1; 6854 goto out; 6855 } 6856 6857 if (inject_pending_event(vcpu, req_int_win) != 0) 6858 req_immediate_exit = true; 6859 else { 6860 /* Enable NMI/IRQ window open exits if needed. 6861 * 6862 * SMIs have two cases: 1) they can be nested, and 6863 * then there is nothing to do here because RSM will 6864 * cause a vmexit anyway; 2) or the SMI can be pending 6865 * because inject_pending_event has completed the 6866 * injection of an IRQ or NMI from the previous vmexit, 6867 * and then we request an immediate exit to inject the SMI. 6868 */ 6869 if (vcpu->arch.smi_pending && !is_smm(vcpu)) 6870 req_immediate_exit = true; 6871 if (vcpu->arch.nmi_pending) 6872 kvm_x86_ops->enable_nmi_window(vcpu); 6873 if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win) 6874 kvm_x86_ops->enable_irq_window(vcpu); 6875 } 6876 6877 if (kvm_lapic_enabled(vcpu)) { 6878 update_cr8_intercept(vcpu); 6879 kvm_lapic_sync_to_vapic(vcpu); 6880 } 6881 } 6882 6883 r = kvm_mmu_reload(vcpu); 6884 if (unlikely(r)) { 6885 goto cancel_injection; 6886 } 6887 6888 preempt_disable(); 6889 6890 kvm_x86_ops->prepare_guest_switch(vcpu); 6891 kvm_load_guest_fpu(vcpu); 6892 6893 /* 6894 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt 6895 * IPI are then delayed after guest entry, which ensures that they 6896 * result in virtual interrupt delivery. 6897 */ 6898 local_irq_disable(); 6899 vcpu->mode = IN_GUEST_MODE; 6900 6901 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 6902 6903 /* 6904 * 1) We should set ->mode before checking ->requests. Please see 6905 * the comment in kvm_vcpu_exiting_guest_mode(). 6906 * 6907 * 2) For APICv, we should set ->mode before checking PIR.ON. This 6908 * pairs with the memory barrier implicit in pi_test_and_set_on 6909 * (see vmx_deliver_posted_interrupt). 6910 * 6911 * 3) This also orders the write to mode from any reads to the page 6912 * tables done while the VCPU is running. Please see the comment 6913 * in kvm_flush_remote_tlbs. 6914 */ 6915 smp_mb__after_srcu_read_unlock(); 6916 6917 /* 6918 * This handles the case where a posted interrupt was 6919 * notified with kvm_vcpu_kick. 6920 */ 6921 if (kvm_lapic_enabled(vcpu)) { 6922 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active) 6923 kvm_x86_ops->sync_pir_to_irr(vcpu); 6924 } 6925 6926 if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) 6927 || need_resched() || signal_pending(current)) { 6928 vcpu->mode = OUTSIDE_GUEST_MODE; 6929 smp_wmb(); 6930 local_irq_enable(); 6931 preempt_enable(); 6932 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 6933 r = 1; 6934 goto cancel_injection; 6935 } 6936 6937 kvm_load_guest_xcr0(vcpu); 6938 6939 if (req_immediate_exit) { 6940 kvm_make_request(KVM_REQ_EVENT, vcpu); 6941 smp_send_reschedule(vcpu->cpu); 6942 } 6943 6944 trace_kvm_entry(vcpu->vcpu_id); 6945 wait_lapic_expire(vcpu); 6946 guest_enter_irqoff(); 6947 6948 if (unlikely(vcpu->arch.switch_db_regs)) { 6949 set_debugreg(0, 7); 6950 set_debugreg(vcpu->arch.eff_db[0], 0); 6951 set_debugreg(vcpu->arch.eff_db[1], 1); 6952 set_debugreg(vcpu->arch.eff_db[2], 2); 6953 set_debugreg(vcpu->arch.eff_db[3], 3); 6954 set_debugreg(vcpu->arch.dr6, 6); 6955 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 6956 } 6957 6958 kvm_x86_ops->run(vcpu); 6959 6960 /* 6961 * Do this here before restoring debug registers on the host. And 6962 * since we do this before handling the vmexit, a DR access vmexit 6963 * can (a) read the correct value of the debug registers, (b) set 6964 * KVM_DEBUGREG_WONT_EXIT again. 6965 */ 6966 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) { 6967 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP); 6968 kvm_x86_ops->sync_dirty_debug_regs(vcpu); 6969 kvm_update_dr0123(vcpu); 6970 kvm_update_dr6(vcpu); 6971 kvm_update_dr7(vcpu); 6972 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD; 6973 } 6974 6975 /* 6976 * If the guest has used debug registers, at least dr7 6977 * will be disabled while returning to the host. 6978 * If we don't have active breakpoints in the host, we don't 6979 * care about the messed up debug address registers. But if 6980 * we have some of them active, restore the old state. 6981 */ 6982 if (hw_breakpoint_active()) 6983 hw_breakpoint_restore(); 6984 6985 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc()); 6986 6987 vcpu->mode = OUTSIDE_GUEST_MODE; 6988 smp_wmb(); 6989 6990 kvm_put_guest_xcr0(vcpu); 6991 6992 kvm_x86_ops->handle_external_intr(vcpu); 6993 6994 ++vcpu->stat.exits; 6995 6996 guest_exit_irqoff(); 6997 6998 local_irq_enable(); 6999 preempt_enable(); 7000 7001 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 7002 7003 /* 7004 * Profile KVM exit RIPs: 7005 */ 7006 if (unlikely(prof_on == KVM_PROFILING)) { 7007 unsigned long rip = kvm_rip_read(vcpu); 7008 profile_hit(KVM_PROFILING, (void *)rip); 7009 } 7010 7011 if (unlikely(vcpu->arch.tsc_always_catchup)) 7012 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7013 7014 if (vcpu->arch.apic_attention) 7015 kvm_lapic_sync_from_vapic(vcpu); 7016 7017 r = kvm_x86_ops->handle_exit(vcpu); 7018 return r; 7019 7020 cancel_injection: 7021 kvm_x86_ops->cancel_injection(vcpu); 7022 if (unlikely(vcpu->arch.apic_attention)) 7023 kvm_lapic_sync_from_vapic(vcpu); 7024 out: 7025 return r; 7026 } 7027 7028 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) 7029 { 7030 if (!kvm_arch_vcpu_runnable(vcpu) && 7031 (!kvm_x86_ops->pre_block || kvm_x86_ops->pre_block(vcpu) == 0)) { 7032 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7033 kvm_vcpu_block(vcpu); 7034 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7035 7036 if (kvm_x86_ops->post_block) 7037 kvm_x86_ops->post_block(vcpu); 7038 7039 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu)) 7040 return 1; 7041 } 7042 7043 kvm_apic_accept_events(vcpu); 7044 switch(vcpu->arch.mp_state) { 7045 case KVM_MP_STATE_HALTED: 7046 vcpu->arch.pv.pv_unhalted = false; 7047 vcpu->arch.mp_state = 7048 KVM_MP_STATE_RUNNABLE; 7049 case KVM_MP_STATE_RUNNABLE: 7050 vcpu->arch.apf.halted = false; 7051 break; 7052 case KVM_MP_STATE_INIT_RECEIVED: 7053 break; 7054 default: 7055 return -EINTR; 7056 break; 7057 } 7058 return 1; 7059 } 7060 7061 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu) 7062 { 7063 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) 7064 kvm_x86_ops->check_nested_events(vcpu, false); 7065 7066 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && 7067 !vcpu->arch.apf.halted); 7068 } 7069 7070 static int vcpu_run(struct kvm_vcpu *vcpu) 7071 { 7072 int r; 7073 struct kvm *kvm = vcpu->kvm; 7074 7075 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7076 7077 for (;;) { 7078 if (kvm_vcpu_running(vcpu)) { 7079 r = vcpu_enter_guest(vcpu); 7080 } else { 7081 r = vcpu_block(kvm, vcpu); 7082 } 7083 7084 if (r <= 0) 7085 break; 7086 7087 kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu); 7088 if (kvm_cpu_has_pending_timer(vcpu)) 7089 kvm_inject_pending_timer_irqs(vcpu); 7090 7091 if (dm_request_for_irq_injection(vcpu) && 7092 kvm_vcpu_ready_for_interrupt_injection(vcpu)) { 7093 r = 0; 7094 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; 7095 ++vcpu->stat.request_irq_exits; 7096 break; 7097 } 7098 7099 kvm_check_async_pf_completion(vcpu); 7100 7101 if (signal_pending(current)) { 7102 r = -EINTR; 7103 vcpu->run->exit_reason = KVM_EXIT_INTR; 7104 ++vcpu->stat.signal_exits; 7105 break; 7106 } 7107 if (need_resched()) { 7108 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7109 cond_resched(); 7110 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); 7111 } 7112 } 7113 7114 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); 7115 7116 return r; 7117 } 7118 7119 static inline int complete_emulated_io(struct kvm_vcpu *vcpu) 7120 { 7121 int r; 7122 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 7123 r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); 7124 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 7125 if (r != EMULATE_DONE) 7126 return 0; 7127 return 1; 7128 } 7129 7130 static int complete_emulated_pio(struct kvm_vcpu *vcpu) 7131 { 7132 BUG_ON(!vcpu->arch.pio.count); 7133 7134 return complete_emulated_io(vcpu); 7135 } 7136 7137 /* 7138 * Implements the following, as a state machine: 7139 * 7140 * read: 7141 * for each fragment 7142 * for each mmio piece in the fragment 7143 * write gpa, len 7144 * exit 7145 * copy data 7146 * execute insn 7147 * 7148 * write: 7149 * for each fragment 7150 * for each mmio piece in the fragment 7151 * write gpa, len 7152 * copy data 7153 * exit 7154 */ 7155 static int complete_emulated_mmio(struct kvm_vcpu *vcpu) 7156 { 7157 struct kvm_run *run = vcpu->run; 7158 struct kvm_mmio_fragment *frag; 7159 unsigned len; 7160 7161 BUG_ON(!vcpu->mmio_needed); 7162 7163 /* Complete previous fragment */ 7164 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment]; 7165 len = min(8u, frag->len); 7166 if (!vcpu->mmio_is_write) 7167 memcpy(frag->data, run->mmio.data, len); 7168 7169 if (frag->len <= 8) { 7170 /* Switch to the next fragment. */ 7171 frag++; 7172 vcpu->mmio_cur_fragment++; 7173 } else { 7174 /* Go forward to the next mmio piece. */ 7175 frag->data += len; 7176 frag->gpa += len; 7177 frag->len -= len; 7178 } 7179 7180 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) { 7181 vcpu->mmio_needed = 0; 7182 7183 /* FIXME: return into emulator if single-stepping. */ 7184 if (vcpu->mmio_is_write) 7185 return 1; 7186 vcpu->mmio_read_completed = 1; 7187 return complete_emulated_io(vcpu); 7188 } 7189 7190 run->exit_reason = KVM_EXIT_MMIO; 7191 run->mmio.phys_addr = frag->gpa; 7192 if (vcpu->mmio_is_write) 7193 memcpy(run->mmio.data, frag->data, min(8u, frag->len)); 7194 run->mmio.len = min(8u, frag->len); 7195 run->mmio.is_write = vcpu->mmio_is_write; 7196 vcpu->arch.complete_userspace_io = complete_emulated_mmio; 7197 return 0; 7198 } 7199 7200 7201 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 7202 { 7203 struct fpu *fpu = ¤t->thread.fpu; 7204 int r; 7205 sigset_t sigsaved; 7206 7207 fpu__activate_curr(fpu); 7208 7209 if (vcpu->sigset_active) 7210 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 7211 7212 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { 7213 kvm_vcpu_block(vcpu); 7214 kvm_apic_accept_events(vcpu); 7215 kvm_clear_request(KVM_REQ_UNHALT, vcpu); 7216 r = -EAGAIN; 7217 goto out; 7218 } 7219 7220 /* re-sync apic's tpr */ 7221 if (!lapic_in_kernel(vcpu)) { 7222 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) { 7223 r = -EINVAL; 7224 goto out; 7225 } 7226 } 7227 7228 if (unlikely(vcpu->arch.complete_userspace_io)) { 7229 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; 7230 vcpu->arch.complete_userspace_io = NULL; 7231 r = cui(vcpu); 7232 if (r <= 0) 7233 goto out; 7234 } else 7235 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); 7236 7237 if (kvm_run->immediate_exit) 7238 r = -EINTR; 7239 else 7240 r = vcpu_run(vcpu); 7241 7242 out: 7243 post_kvm_run_save(vcpu); 7244 if (vcpu->sigset_active) 7245 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 7246 7247 return r; 7248 } 7249 7250 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7251 { 7252 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) { 7253 /* 7254 * We are here if userspace calls get_regs() in the middle of 7255 * instruction emulation. Registers state needs to be copied 7256 * back from emulation context to vcpu. Userspace shouldn't do 7257 * that usually, but some bad designed PV devices (vmware 7258 * backdoor interface) need this to work 7259 */ 7260 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt); 7261 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 7262 } 7263 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); 7264 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX); 7265 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX); 7266 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX); 7267 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI); 7268 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI); 7269 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); 7270 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP); 7271 #ifdef CONFIG_X86_64 7272 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8); 7273 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9); 7274 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10); 7275 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11); 7276 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12); 7277 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13); 7278 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14); 7279 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15); 7280 #endif 7281 7282 regs->rip = kvm_rip_read(vcpu); 7283 regs->rflags = kvm_get_rflags(vcpu); 7284 7285 return 0; 7286 } 7287 7288 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 7289 { 7290 vcpu->arch.emulate_regs_need_sync_from_vcpu = true; 7291 vcpu->arch.emulate_regs_need_sync_to_vcpu = false; 7292 7293 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax); 7294 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx); 7295 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx); 7296 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx); 7297 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi); 7298 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi); 7299 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp); 7300 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp); 7301 #ifdef CONFIG_X86_64 7302 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8); 7303 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9); 7304 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10); 7305 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11); 7306 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12); 7307 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13); 7308 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14); 7309 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15); 7310 #endif 7311 7312 kvm_rip_write(vcpu, regs->rip); 7313 kvm_set_rflags(vcpu, regs->rflags); 7314 7315 vcpu->arch.exception.pending = false; 7316 7317 kvm_make_request(KVM_REQ_EVENT, vcpu); 7318 7319 return 0; 7320 } 7321 7322 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) 7323 { 7324 struct kvm_segment cs; 7325 7326 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 7327 *db = cs.db; 7328 *l = cs.l; 7329 } 7330 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); 7331 7332 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 7333 struct kvm_sregs *sregs) 7334 { 7335 struct desc_ptr dt; 7336 7337 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 7338 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 7339 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); 7340 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 7341 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 7342 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 7343 7344 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 7345 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 7346 7347 kvm_x86_ops->get_idt(vcpu, &dt); 7348 sregs->idt.limit = dt.size; 7349 sregs->idt.base = dt.address; 7350 kvm_x86_ops->get_gdt(vcpu, &dt); 7351 sregs->gdt.limit = dt.size; 7352 sregs->gdt.base = dt.address; 7353 7354 sregs->cr0 = kvm_read_cr0(vcpu); 7355 sregs->cr2 = vcpu->arch.cr2; 7356 sregs->cr3 = kvm_read_cr3(vcpu); 7357 sregs->cr4 = kvm_read_cr4(vcpu); 7358 sregs->cr8 = kvm_get_cr8(vcpu); 7359 sregs->efer = vcpu->arch.efer; 7360 sregs->apic_base = kvm_get_apic_base(vcpu); 7361 7362 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); 7363 7364 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft) 7365 set_bit(vcpu->arch.interrupt.nr, 7366 (unsigned long *)sregs->interrupt_bitmap); 7367 7368 return 0; 7369 } 7370 7371 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 7372 struct kvm_mp_state *mp_state) 7373 { 7374 kvm_apic_accept_events(vcpu); 7375 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED && 7376 vcpu->arch.pv.pv_unhalted) 7377 mp_state->mp_state = KVM_MP_STATE_RUNNABLE; 7378 else 7379 mp_state->mp_state = vcpu->arch.mp_state; 7380 7381 return 0; 7382 } 7383 7384 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 7385 struct kvm_mp_state *mp_state) 7386 { 7387 if (!lapic_in_kernel(vcpu) && 7388 mp_state->mp_state != KVM_MP_STATE_RUNNABLE) 7389 return -EINVAL; 7390 7391 /* INITs are latched while in SMM */ 7392 if ((is_smm(vcpu) || vcpu->arch.smi_pending) && 7393 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED || 7394 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED)) 7395 return -EINVAL; 7396 7397 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) { 7398 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; 7399 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events); 7400 } else 7401 vcpu->arch.mp_state = mp_state->mp_state; 7402 kvm_make_request(KVM_REQ_EVENT, vcpu); 7403 return 0; 7404 } 7405 7406 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, 7407 int reason, bool has_error_code, u32 error_code) 7408 { 7409 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; 7410 int ret; 7411 7412 init_emulate_ctxt(vcpu); 7413 7414 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason, 7415 has_error_code, error_code); 7416 7417 if (ret) 7418 return EMULATE_FAIL; 7419 7420 kvm_rip_write(vcpu, ctxt->eip); 7421 kvm_set_rflags(vcpu, ctxt->eflags); 7422 kvm_make_request(KVM_REQ_EVENT, vcpu); 7423 return EMULATE_DONE; 7424 } 7425 EXPORT_SYMBOL_GPL(kvm_task_switch); 7426 7427 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 7428 struct kvm_sregs *sregs) 7429 { 7430 struct msr_data apic_base_msr; 7431 int mmu_reset_needed = 0; 7432 int pending_vec, max_bits, idx; 7433 struct desc_ptr dt; 7434 7435 if (!guest_cpuid_has_xsave(vcpu) && (sregs->cr4 & X86_CR4_OSXSAVE)) 7436 return -EINVAL; 7437 7438 dt.size = sregs->idt.limit; 7439 dt.address = sregs->idt.base; 7440 kvm_x86_ops->set_idt(vcpu, &dt); 7441 dt.size = sregs->gdt.limit; 7442 dt.address = sregs->gdt.base; 7443 kvm_x86_ops->set_gdt(vcpu, &dt); 7444 7445 vcpu->arch.cr2 = sregs->cr2; 7446 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3; 7447 vcpu->arch.cr3 = sregs->cr3; 7448 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); 7449 7450 kvm_set_cr8(vcpu, sregs->cr8); 7451 7452 mmu_reset_needed |= vcpu->arch.efer != sregs->efer; 7453 kvm_x86_ops->set_efer(vcpu, sregs->efer); 7454 apic_base_msr.data = sregs->apic_base; 7455 apic_base_msr.host_initiated = true; 7456 kvm_set_apic_base(vcpu, &apic_base_msr); 7457 7458 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; 7459 kvm_x86_ops->set_cr0(vcpu, sregs->cr0); 7460 vcpu->arch.cr0 = sregs->cr0; 7461 7462 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; 7463 kvm_x86_ops->set_cr4(vcpu, sregs->cr4); 7464 if (sregs->cr4 & (X86_CR4_OSXSAVE | X86_CR4_PKE)) 7465 kvm_update_cpuid(vcpu); 7466 7467 idx = srcu_read_lock(&vcpu->kvm->srcu); 7468 if (!is_long_mode(vcpu) && is_pae(vcpu)) { 7469 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); 7470 mmu_reset_needed = 1; 7471 } 7472 srcu_read_unlock(&vcpu->kvm->srcu, idx); 7473 7474 if (mmu_reset_needed) 7475 kvm_mmu_reset_context(vcpu); 7476 7477 max_bits = KVM_NR_INTERRUPTS; 7478 pending_vec = find_first_bit( 7479 (const unsigned long *)sregs->interrupt_bitmap, max_bits); 7480 if (pending_vec < max_bits) { 7481 kvm_queue_interrupt(vcpu, pending_vec, false); 7482 pr_debug("Set back pending irq %d\n", pending_vec); 7483 } 7484 7485 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); 7486 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); 7487 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); 7488 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); 7489 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); 7490 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); 7491 7492 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); 7493 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); 7494 7495 update_cr8_intercept(vcpu); 7496 7497 /* Older userspace won't unhalt the vcpu on reset. */ 7498 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && 7499 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && 7500 !is_protmode(vcpu)) 7501 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 7502 7503 kvm_make_request(KVM_REQ_EVENT, vcpu); 7504 7505 return 0; 7506 } 7507 7508 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 7509 struct kvm_guest_debug *dbg) 7510 { 7511 unsigned long rflags; 7512 int i, r; 7513 7514 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { 7515 r = -EBUSY; 7516 if (vcpu->arch.exception.pending) 7517 goto out; 7518 if (dbg->control & KVM_GUESTDBG_INJECT_DB) 7519 kvm_queue_exception(vcpu, DB_VECTOR); 7520 else 7521 kvm_queue_exception(vcpu, BP_VECTOR); 7522 } 7523 7524 /* 7525 * Read rflags as long as potentially injected trace flags are still 7526 * filtered out. 7527 */ 7528 rflags = kvm_get_rflags(vcpu); 7529 7530 vcpu->guest_debug = dbg->control; 7531 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) 7532 vcpu->guest_debug = 0; 7533 7534 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { 7535 for (i = 0; i < KVM_NR_DB_REGS; ++i) 7536 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; 7537 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; 7538 } else { 7539 for (i = 0; i < KVM_NR_DB_REGS; i++) 7540 vcpu->arch.eff_db[i] = vcpu->arch.db[i]; 7541 } 7542 kvm_update_dr7(vcpu); 7543 7544 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 7545 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + 7546 get_segment_base(vcpu, VCPU_SREG_CS); 7547 7548 /* 7549 * Trigger an rflags update that will inject or remove the trace 7550 * flags. 7551 */ 7552 kvm_set_rflags(vcpu, rflags); 7553 7554 kvm_x86_ops->update_bp_intercept(vcpu); 7555 7556 r = 0; 7557 7558 out: 7559 7560 return r; 7561 } 7562 7563 /* 7564 * Translate a guest virtual address to a guest physical address. 7565 */ 7566 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 7567 struct kvm_translation *tr) 7568 { 7569 unsigned long vaddr = tr->linear_address; 7570 gpa_t gpa; 7571 int idx; 7572 7573 idx = srcu_read_lock(&vcpu->kvm->srcu); 7574 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); 7575 srcu_read_unlock(&vcpu->kvm->srcu, idx); 7576 tr->physical_address = gpa; 7577 tr->valid = gpa != UNMAPPED_GVA; 7578 tr->writeable = 1; 7579 tr->usermode = 0; 7580 7581 return 0; 7582 } 7583 7584 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 7585 { 7586 struct fxregs_state *fxsave = 7587 &vcpu->arch.guest_fpu.state.fxsave; 7588 7589 memcpy(fpu->fpr, fxsave->st_space, 128); 7590 fpu->fcw = fxsave->cwd; 7591 fpu->fsw = fxsave->swd; 7592 fpu->ftwx = fxsave->twd; 7593 fpu->last_opcode = fxsave->fop; 7594 fpu->last_ip = fxsave->rip; 7595 fpu->last_dp = fxsave->rdp; 7596 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); 7597 7598 return 0; 7599 } 7600 7601 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 7602 { 7603 struct fxregs_state *fxsave = 7604 &vcpu->arch.guest_fpu.state.fxsave; 7605 7606 memcpy(fxsave->st_space, fpu->fpr, 128); 7607 fxsave->cwd = fpu->fcw; 7608 fxsave->swd = fpu->fsw; 7609 fxsave->twd = fpu->ftwx; 7610 fxsave->fop = fpu->last_opcode; 7611 fxsave->rip = fpu->last_ip; 7612 fxsave->rdp = fpu->last_dp; 7613 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); 7614 7615 return 0; 7616 } 7617 7618 static void fx_init(struct kvm_vcpu *vcpu) 7619 { 7620 fpstate_init(&vcpu->arch.guest_fpu.state); 7621 if (boot_cpu_has(X86_FEATURE_XSAVES)) 7622 vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv = 7623 host_xcr0 | XSTATE_COMPACTION_ENABLED; 7624 7625 /* 7626 * Ensure guest xcr0 is valid for loading 7627 */ 7628 vcpu->arch.xcr0 = XFEATURE_MASK_FP; 7629 7630 vcpu->arch.cr0 |= X86_CR0_ET; 7631 } 7632 7633 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) 7634 { 7635 if (vcpu->guest_fpu_loaded) 7636 return; 7637 7638 /* 7639 * Restore all possible states in the guest, 7640 * and assume host would use all available bits. 7641 * Guest xcr0 would be loaded later. 7642 */ 7643 vcpu->guest_fpu_loaded = 1; 7644 __kernel_fpu_begin(); 7645 /* PKRU is separately restored in kvm_x86_ops->run. */ 7646 __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu.state, 7647 ~XFEATURE_MASK_PKRU); 7648 trace_kvm_fpu(1); 7649 } 7650 7651 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) 7652 { 7653 if (!vcpu->guest_fpu_loaded) 7654 return; 7655 7656 vcpu->guest_fpu_loaded = 0; 7657 copy_fpregs_to_fpstate(&vcpu->arch.guest_fpu); 7658 __kernel_fpu_end(); 7659 ++vcpu->stat.fpu_reload; 7660 trace_kvm_fpu(0); 7661 } 7662 7663 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 7664 { 7665 void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask; 7666 7667 kvmclock_reset(vcpu); 7668 7669 kvm_x86_ops->vcpu_free(vcpu); 7670 free_cpumask_var(wbinvd_dirty_mask); 7671 } 7672 7673 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 7674 unsigned int id) 7675 { 7676 struct kvm_vcpu *vcpu; 7677 7678 if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) 7679 printk_once(KERN_WARNING 7680 "kvm: SMP vm created on host with unstable TSC; " 7681 "guest TSC will not be reliable\n"); 7682 7683 vcpu = kvm_x86_ops->vcpu_create(kvm, id); 7684 7685 return vcpu; 7686 } 7687 7688 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 7689 { 7690 int r; 7691 7692 kvm_vcpu_mtrr_init(vcpu); 7693 r = vcpu_load(vcpu); 7694 if (r) 7695 return r; 7696 kvm_vcpu_reset(vcpu, false); 7697 kvm_mmu_setup(vcpu); 7698 vcpu_put(vcpu); 7699 return r; 7700 } 7701 7702 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 7703 { 7704 struct msr_data msr; 7705 struct kvm *kvm = vcpu->kvm; 7706 7707 kvm_hv_vcpu_postcreate(vcpu); 7708 7709 if (vcpu_load(vcpu)) 7710 return; 7711 msr.data = 0x0; 7712 msr.index = MSR_IA32_TSC; 7713 msr.host_initiated = true; 7714 kvm_write_tsc(vcpu, &msr); 7715 vcpu_put(vcpu); 7716 7717 if (!kvmclock_periodic_sync) 7718 return; 7719 7720 schedule_delayed_work(&kvm->arch.kvmclock_sync_work, 7721 KVMCLOCK_SYNC_PERIOD); 7722 } 7723 7724 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 7725 { 7726 int r; 7727 vcpu->arch.apf.msr_val = 0; 7728 7729 r = vcpu_load(vcpu); 7730 BUG_ON(r); 7731 kvm_mmu_unload(vcpu); 7732 vcpu_put(vcpu); 7733 7734 kvm_x86_ops->vcpu_free(vcpu); 7735 } 7736 7737 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) 7738 { 7739 vcpu->arch.hflags = 0; 7740 7741 vcpu->arch.smi_pending = 0; 7742 atomic_set(&vcpu->arch.nmi_queued, 0); 7743 vcpu->arch.nmi_pending = 0; 7744 vcpu->arch.nmi_injected = false; 7745 kvm_clear_interrupt_queue(vcpu); 7746 kvm_clear_exception_queue(vcpu); 7747 7748 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); 7749 kvm_update_dr0123(vcpu); 7750 vcpu->arch.dr6 = DR6_INIT; 7751 kvm_update_dr6(vcpu); 7752 vcpu->arch.dr7 = DR7_FIXED_1; 7753 kvm_update_dr7(vcpu); 7754 7755 vcpu->arch.cr2 = 0; 7756 7757 kvm_make_request(KVM_REQ_EVENT, vcpu); 7758 vcpu->arch.apf.msr_val = 0; 7759 vcpu->arch.st.msr_val = 0; 7760 7761 kvmclock_reset(vcpu); 7762 7763 kvm_clear_async_pf_completion_queue(vcpu); 7764 kvm_async_pf_hash_reset(vcpu); 7765 vcpu->arch.apf.halted = false; 7766 7767 if (!init_event) { 7768 kvm_pmu_reset(vcpu); 7769 vcpu->arch.smbase = 0x30000; 7770 7771 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT; 7772 vcpu->arch.msr_misc_features_enables = 0; 7773 } 7774 7775 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs)); 7776 vcpu->arch.regs_avail = ~0; 7777 vcpu->arch.regs_dirty = ~0; 7778 7779 kvm_x86_ops->vcpu_reset(vcpu, init_event); 7780 } 7781 7782 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) 7783 { 7784 struct kvm_segment cs; 7785 7786 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); 7787 cs.selector = vector << 8; 7788 cs.base = vector << 12; 7789 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); 7790 kvm_rip_write(vcpu, 0); 7791 } 7792 7793 int kvm_arch_hardware_enable(void) 7794 { 7795 struct kvm *kvm; 7796 struct kvm_vcpu *vcpu; 7797 int i; 7798 int ret; 7799 u64 local_tsc; 7800 u64 max_tsc = 0; 7801 bool stable, backwards_tsc = false; 7802 7803 kvm_shared_msr_cpu_online(); 7804 ret = kvm_x86_ops->hardware_enable(); 7805 if (ret != 0) 7806 return ret; 7807 7808 local_tsc = rdtsc(); 7809 stable = !check_tsc_unstable(); 7810 list_for_each_entry(kvm, &vm_list, vm_list) { 7811 kvm_for_each_vcpu(i, vcpu, kvm) { 7812 if (!stable && vcpu->cpu == smp_processor_id()) 7813 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); 7814 if (stable && vcpu->arch.last_host_tsc > local_tsc) { 7815 backwards_tsc = true; 7816 if (vcpu->arch.last_host_tsc > max_tsc) 7817 max_tsc = vcpu->arch.last_host_tsc; 7818 } 7819 } 7820 } 7821 7822 /* 7823 * Sometimes, even reliable TSCs go backwards. This happens on 7824 * platforms that reset TSC during suspend or hibernate actions, but 7825 * maintain synchronization. We must compensate. Fortunately, we can 7826 * detect that condition here, which happens early in CPU bringup, 7827 * before any KVM threads can be running. Unfortunately, we can't 7828 * bring the TSCs fully up to date with real time, as we aren't yet far 7829 * enough into CPU bringup that we know how much real time has actually 7830 * elapsed; our helper function, ktime_get_boot_ns() will be using boot 7831 * variables that haven't been updated yet. 7832 * 7833 * So we simply find the maximum observed TSC above, then record the 7834 * adjustment to TSC in each VCPU. When the VCPU later gets loaded, 7835 * the adjustment will be applied. Note that we accumulate 7836 * adjustments, in case multiple suspend cycles happen before some VCPU 7837 * gets a chance to run again. In the event that no KVM threads get a 7838 * chance to run, we will miss the entire elapsed period, as we'll have 7839 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may 7840 * loose cycle time. This isn't too big a deal, since the loss will be 7841 * uniform across all VCPUs (not to mention the scenario is extremely 7842 * unlikely). It is possible that a second hibernate recovery happens 7843 * much faster than a first, causing the observed TSC here to be 7844 * smaller; this would require additional padding adjustment, which is 7845 * why we set last_host_tsc to the local tsc observed here. 7846 * 7847 * N.B. - this code below runs only on platforms with reliable TSC, 7848 * as that is the only way backwards_tsc is set above. Also note 7849 * that this runs for ALL vcpus, which is not a bug; all VCPUs should 7850 * have the same delta_cyc adjustment applied if backwards_tsc 7851 * is detected. Note further, this adjustment is only done once, 7852 * as we reset last_host_tsc on all VCPUs to stop this from being 7853 * called multiple times (one for each physical CPU bringup). 7854 * 7855 * Platforms with unreliable TSCs don't have to deal with this, they 7856 * will be compensated by the logic in vcpu_load, which sets the TSC to 7857 * catchup mode. This will catchup all VCPUs to real time, but cannot 7858 * guarantee that they stay in perfect synchronization. 7859 */ 7860 if (backwards_tsc) { 7861 u64 delta_cyc = max_tsc - local_tsc; 7862 list_for_each_entry(kvm, &vm_list, vm_list) { 7863 kvm->arch.backwards_tsc_observed = true; 7864 kvm_for_each_vcpu(i, vcpu, kvm) { 7865 vcpu->arch.tsc_offset_adjustment += delta_cyc; 7866 vcpu->arch.last_host_tsc = local_tsc; 7867 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 7868 } 7869 7870 /* 7871 * We have to disable TSC offset matching.. if you were 7872 * booting a VM while issuing an S4 host suspend.... 7873 * you may have some problem. Solving this issue is 7874 * left as an exercise to the reader. 7875 */ 7876 kvm->arch.last_tsc_nsec = 0; 7877 kvm->arch.last_tsc_write = 0; 7878 } 7879 7880 } 7881 return 0; 7882 } 7883 7884 void kvm_arch_hardware_disable(void) 7885 { 7886 kvm_x86_ops->hardware_disable(); 7887 drop_user_return_notifiers(); 7888 } 7889 7890 int kvm_arch_hardware_setup(void) 7891 { 7892 int r; 7893 7894 r = kvm_x86_ops->hardware_setup(); 7895 if (r != 0) 7896 return r; 7897 7898 if (kvm_has_tsc_control) { 7899 /* 7900 * Make sure the user can only configure tsc_khz values that 7901 * fit into a signed integer. 7902 * A min value is not calculated needed because it will always 7903 * be 1 on all machines. 7904 */ 7905 u64 max = min(0x7fffffffULL, 7906 __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz)); 7907 kvm_max_guest_tsc_khz = max; 7908 7909 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits; 7910 } 7911 7912 kvm_init_msr_list(); 7913 return 0; 7914 } 7915 7916 void kvm_arch_hardware_unsetup(void) 7917 { 7918 kvm_x86_ops->hardware_unsetup(); 7919 } 7920 7921 void kvm_arch_check_processor_compat(void *rtn) 7922 { 7923 kvm_x86_ops->check_processor_compatibility(rtn); 7924 } 7925 7926 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) 7927 { 7928 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; 7929 } 7930 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); 7931 7932 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) 7933 { 7934 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0; 7935 } 7936 7937 struct static_key kvm_no_apic_vcpu __read_mostly; 7938 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu); 7939 7940 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 7941 { 7942 struct page *page; 7943 struct kvm *kvm; 7944 int r; 7945 7946 BUG_ON(vcpu->kvm == NULL); 7947 kvm = vcpu->kvm; 7948 7949 vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(); 7950 vcpu->arch.pv.pv_unhalted = false; 7951 vcpu->arch.emulate_ctxt.ops = &emulate_ops; 7952 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_reset_bsp(vcpu)) 7953 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 7954 else 7955 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; 7956 7957 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 7958 if (!page) { 7959 r = -ENOMEM; 7960 goto fail; 7961 } 7962 vcpu->arch.pio_data = page_address(page); 7963 7964 kvm_set_tsc_khz(vcpu, max_tsc_khz); 7965 7966 r = kvm_mmu_create(vcpu); 7967 if (r < 0) 7968 goto fail_free_pio_data; 7969 7970 if (irqchip_in_kernel(kvm)) { 7971 r = kvm_create_lapic(vcpu); 7972 if (r < 0) 7973 goto fail_mmu_destroy; 7974 } else 7975 static_key_slow_inc(&kvm_no_apic_vcpu); 7976 7977 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, 7978 GFP_KERNEL); 7979 if (!vcpu->arch.mce_banks) { 7980 r = -ENOMEM; 7981 goto fail_free_lapic; 7982 } 7983 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; 7984 7985 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) { 7986 r = -ENOMEM; 7987 goto fail_free_mce_banks; 7988 } 7989 7990 fx_init(vcpu); 7991 7992 vcpu->arch.ia32_tsc_adjust_msr = 0x0; 7993 vcpu->arch.pv_time_enabled = false; 7994 7995 vcpu->arch.guest_supported_xcr0 = 0; 7996 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; 7997 7998 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); 7999 8000 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT; 8001 8002 kvm_async_pf_hash_reset(vcpu); 8003 kvm_pmu_init(vcpu); 8004 8005 vcpu->arch.pending_external_vector = -1; 8006 8007 kvm_hv_vcpu_init(vcpu); 8008 8009 return 0; 8010 8011 fail_free_mce_banks: 8012 kfree(vcpu->arch.mce_banks); 8013 fail_free_lapic: 8014 kvm_free_lapic(vcpu); 8015 fail_mmu_destroy: 8016 kvm_mmu_destroy(vcpu); 8017 fail_free_pio_data: 8018 free_page((unsigned long)vcpu->arch.pio_data); 8019 fail: 8020 return r; 8021 } 8022 8023 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 8024 { 8025 int idx; 8026 8027 kvm_hv_vcpu_uninit(vcpu); 8028 kvm_pmu_destroy(vcpu); 8029 kfree(vcpu->arch.mce_banks); 8030 kvm_free_lapic(vcpu); 8031 idx = srcu_read_lock(&vcpu->kvm->srcu); 8032 kvm_mmu_destroy(vcpu); 8033 srcu_read_unlock(&vcpu->kvm->srcu, idx); 8034 free_page((unsigned long)vcpu->arch.pio_data); 8035 if (!lapic_in_kernel(vcpu)) 8036 static_key_slow_dec(&kvm_no_apic_vcpu); 8037 } 8038 8039 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) 8040 { 8041 kvm_x86_ops->sched_in(vcpu, cpu); 8042 } 8043 8044 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 8045 { 8046 if (type) 8047 return -EINVAL; 8048 8049 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list); 8050 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); 8051 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); 8052 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); 8053 atomic_set(&kvm->arch.noncoherent_dma_count, 0); 8054 8055 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ 8056 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); 8057 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ 8058 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, 8059 &kvm->arch.irq_sources_bitmap); 8060 8061 raw_spin_lock_init(&kvm->arch.tsc_write_lock); 8062 mutex_init(&kvm->arch.apic_map_lock); 8063 mutex_init(&kvm->arch.hyperv.hv_lock); 8064 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock); 8065 8066 kvm->arch.kvmclock_offset = -ktime_get_boot_ns(); 8067 pvclock_update_vm_gtod_copy(kvm); 8068 8069 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn); 8070 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn); 8071 8072 kvm_page_track_init(kvm); 8073 kvm_mmu_init_vm(kvm); 8074 8075 if (kvm_x86_ops->vm_init) 8076 return kvm_x86_ops->vm_init(kvm); 8077 8078 return 0; 8079 } 8080 8081 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) 8082 { 8083 int r; 8084 r = vcpu_load(vcpu); 8085 BUG_ON(r); 8086 kvm_mmu_unload(vcpu); 8087 vcpu_put(vcpu); 8088 } 8089 8090 static void kvm_free_vcpus(struct kvm *kvm) 8091 { 8092 unsigned int i; 8093 struct kvm_vcpu *vcpu; 8094 8095 /* 8096 * Unpin any mmu pages first. 8097 */ 8098 kvm_for_each_vcpu(i, vcpu, kvm) { 8099 kvm_clear_async_pf_completion_queue(vcpu); 8100 kvm_unload_vcpu_mmu(vcpu); 8101 } 8102 kvm_for_each_vcpu(i, vcpu, kvm) 8103 kvm_arch_vcpu_free(vcpu); 8104 8105 mutex_lock(&kvm->lock); 8106 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 8107 kvm->vcpus[i] = NULL; 8108 8109 atomic_set(&kvm->online_vcpus, 0); 8110 mutex_unlock(&kvm->lock); 8111 } 8112 8113 void kvm_arch_sync_events(struct kvm *kvm) 8114 { 8115 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work); 8116 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work); 8117 kvm_free_pit(kvm); 8118 } 8119 8120 int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 8121 { 8122 int i, r; 8123 unsigned long hva; 8124 struct kvm_memslots *slots = kvm_memslots(kvm); 8125 struct kvm_memory_slot *slot, old; 8126 8127 /* Called with kvm->slots_lock held. */ 8128 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM)) 8129 return -EINVAL; 8130 8131 slot = id_to_memslot(slots, id); 8132 if (size) { 8133 if (slot->npages) 8134 return -EEXIST; 8135 8136 /* 8137 * MAP_SHARED to prevent internal slot pages from being moved 8138 * by fork()/COW. 8139 */ 8140 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE, 8141 MAP_SHARED | MAP_ANONYMOUS, 0); 8142 if (IS_ERR((void *)hva)) 8143 return PTR_ERR((void *)hva); 8144 } else { 8145 if (!slot->npages) 8146 return 0; 8147 8148 hva = 0; 8149 } 8150 8151 old = *slot; 8152 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { 8153 struct kvm_userspace_memory_region m; 8154 8155 m.slot = id | (i << 16); 8156 m.flags = 0; 8157 m.guest_phys_addr = gpa; 8158 m.userspace_addr = hva; 8159 m.memory_size = size; 8160 r = __kvm_set_memory_region(kvm, &m); 8161 if (r < 0) 8162 return r; 8163 } 8164 8165 if (!size) { 8166 r = vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE); 8167 WARN_ON(r < 0); 8168 } 8169 8170 return 0; 8171 } 8172 EXPORT_SYMBOL_GPL(__x86_set_memory_region); 8173 8174 int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size) 8175 { 8176 int r; 8177 8178 mutex_lock(&kvm->slots_lock); 8179 r = __x86_set_memory_region(kvm, id, gpa, size); 8180 mutex_unlock(&kvm->slots_lock); 8181 8182 return r; 8183 } 8184 EXPORT_SYMBOL_GPL(x86_set_memory_region); 8185 8186 void kvm_arch_destroy_vm(struct kvm *kvm) 8187 { 8188 if (current->mm == kvm->mm) { 8189 /* 8190 * Free memory regions allocated on behalf of userspace, 8191 * unless the the memory map has changed due to process exit 8192 * or fd copying. 8193 */ 8194 x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0); 8195 x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0); 8196 x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0); 8197 } 8198 if (kvm_x86_ops->vm_destroy) 8199 kvm_x86_ops->vm_destroy(kvm); 8200 kvm_pic_destroy(kvm); 8201 kvm_ioapic_destroy(kvm); 8202 kvm_free_vcpus(kvm); 8203 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); 8204 kvm_mmu_uninit_vm(kvm); 8205 kvm_page_track_cleanup(kvm); 8206 } 8207 8208 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, 8209 struct kvm_memory_slot *dont) 8210 { 8211 int i; 8212 8213 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 8214 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { 8215 kvfree(free->arch.rmap[i]); 8216 free->arch.rmap[i] = NULL; 8217 } 8218 if (i == 0) 8219 continue; 8220 8221 if (!dont || free->arch.lpage_info[i - 1] != 8222 dont->arch.lpage_info[i - 1]) { 8223 kvfree(free->arch.lpage_info[i - 1]); 8224 free->arch.lpage_info[i - 1] = NULL; 8225 } 8226 } 8227 8228 kvm_page_track_free_memslot(free, dont); 8229 } 8230 8231 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, 8232 unsigned long npages) 8233 { 8234 int i; 8235 8236 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 8237 struct kvm_lpage_info *linfo; 8238 unsigned long ugfn; 8239 int lpages; 8240 int level = i + 1; 8241 8242 lpages = gfn_to_index(slot->base_gfn + npages - 1, 8243 slot->base_gfn, level) + 1; 8244 8245 slot->arch.rmap[i] = 8246 kvzalloc(lpages * sizeof(*slot->arch.rmap[i]), GFP_KERNEL); 8247 if (!slot->arch.rmap[i]) 8248 goto out_free; 8249 if (i == 0) 8250 continue; 8251 8252 linfo = kvzalloc(lpages * sizeof(*linfo), GFP_KERNEL); 8253 if (!linfo) 8254 goto out_free; 8255 8256 slot->arch.lpage_info[i - 1] = linfo; 8257 8258 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) 8259 linfo[0].disallow_lpage = 1; 8260 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) 8261 linfo[lpages - 1].disallow_lpage = 1; 8262 ugfn = slot->userspace_addr >> PAGE_SHIFT; 8263 /* 8264 * If the gfn and userspace address are not aligned wrt each 8265 * other, or if explicitly asked to, disable large page 8266 * support for this slot 8267 */ 8268 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || 8269 !kvm_largepages_enabled()) { 8270 unsigned long j; 8271 8272 for (j = 0; j < lpages; ++j) 8273 linfo[j].disallow_lpage = 1; 8274 } 8275 } 8276 8277 if (kvm_page_track_create_memslot(slot, npages)) 8278 goto out_free; 8279 8280 return 0; 8281 8282 out_free: 8283 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { 8284 kvfree(slot->arch.rmap[i]); 8285 slot->arch.rmap[i] = NULL; 8286 if (i == 0) 8287 continue; 8288 8289 kvfree(slot->arch.lpage_info[i - 1]); 8290 slot->arch.lpage_info[i - 1] = NULL; 8291 } 8292 return -ENOMEM; 8293 } 8294 8295 void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots) 8296 { 8297 /* 8298 * memslots->generation has been incremented. 8299 * mmio generation may have reached its maximum value. 8300 */ 8301 kvm_mmu_invalidate_mmio_sptes(kvm, slots); 8302 } 8303 8304 int kvm_arch_prepare_memory_region(struct kvm *kvm, 8305 struct kvm_memory_slot *memslot, 8306 const struct kvm_userspace_memory_region *mem, 8307 enum kvm_mr_change change) 8308 { 8309 return 0; 8310 } 8311 8312 static void kvm_mmu_slot_apply_flags(struct kvm *kvm, 8313 struct kvm_memory_slot *new) 8314 { 8315 /* Still write protect RO slot */ 8316 if (new->flags & KVM_MEM_READONLY) { 8317 kvm_mmu_slot_remove_write_access(kvm, new); 8318 return; 8319 } 8320 8321 /* 8322 * Call kvm_x86_ops dirty logging hooks when they are valid. 8323 * 8324 * kvm_x86_ops->slot_disable_log_dirty is called when: 8325 * 8326 * - KVM_MR_CREATE with dirty logging is disabled 8327 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag 8328 * 8329 * The reason is, in case of PML, we need to set D-bit for any slots 8330 * with dirty logging disabled in order to eliminate unnecessary GPA 8331 * logging in PML buffer (and potential PML buffer full VMEXT). This 8332 * guarantees leaving PML enabled during guest's lifetime won't have 8333 * any additonal overhead from PML when guest is running with dirty 8334 * logging disabled for memory slots. 8335 * 8336 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot 8337 * to dirty logging mode. 8338 * 8339 * If kvm_x86_ops dirty logging hooks are invalid, use write protect. 8340 * 8341 * In case of write protect: 8342 * 8343 * Write protect all pages for dirty logging. 8344 * 8345 * All the sptes including the large sptes which point to this 8346 * slot are set to readonly. We can not create any new large 8347 * spte on this slot until the end of the logging. 8348 * 8349 * See the comments in fast_page_fault(). 8350 */ 8351 if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) { 8352 if (kvm_x86_ops->slot_enable_log_dirty) 8353 kvm_x86_ops->slot_enable_log_dirty(kvm, new); 8354 else 8355 kvm_mmu_slot_remove_write_access(kvm, new); 8356 } else { 8357 if (kvm_x86_ops->slot_disable_log_dirty) 8358 kvm_x86_ops->slot_disable_log_dirty(kvm, new); 8359 } 8360 } 8361 8362 void kvm_arch_commit_memory_region(struct kvm *kvm, 8363 const struct kvm_userspace_memory_region *mem, 8364 const struct kvm_memory_slot *old, 8365 const struct kvm_memory_slot *new, 8366 enum kvm_mr_change change) 8367 { 8368 int nr_mmu_pages = 0; 8369 8370 if (!kvm->arch.n_requested_mmu_pages) 8371 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); 8372 8373 if (nr_mmu_pages) 8374 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); 8375 8376 /* 8377 * Dirty logging tracks sptes in 4k granularity, meaning that large 8378 * sptes have to be split. If live migration is successful, the guest 8379 * in the source machine will be destroyed and large sptes will be 8380 * created in the destination. However, if the guest continues to run 8381 * in the source machine (for example if live migration fails), small 8382 * sptes will remain around and cause bad performance. 8383 * 8384 * Scan sptes if dirty logging has been stopped, dropping those 8385 * which can be collapsed into a single large-page spte. Later 8386 * page faults will create the large-page sptes. 8387 */ 8388 if ((change != KVM_MR_DELETE) && 8389 (old->flags & KVM_MEM_LOG_DIRTY_PAGES) && 8390 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) 8391 kvm_mmu_zap_collapsible_sptes(kvm, new); 8392 8393 /* 8394 * Set up write protection and/or dirty logging for the new slot. 8395 * 8396 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have 8397 * been zapped so no dirty logging staff is needed for old slot. For 8398 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the 8399 * new and it's also covered when dealing with the new slot. 8400 * 8401 * FIXME: const-ify all uses of struct kvm_memory_slot. 8402 */ 8403 if (change != KVM_MR_DELETE) 8404 kvm_mmu_slot_apply_flags(kvm, (struct kvm_memory_slot *) new); 8405 } 8406 8407 void kvm_arch_flush_shadow_all(struct kvm *kvm) 8408 { 8409 kvm_mmu_invalidate_zap_all_pages(kvm); 8410 } 8411 8412 void kvm_arch_flush_shadow_memslot(struct kvm *kvm, 8413 struct kvm_memory_slot *slot) 8414 { 8415 kvm_page_track_flush_slot(kvm, slot); 8416 } 8417 8418 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) 8419 { 8420 if (!list_empty_careful(&vcpu->async_pf.done)) 8421 return true; 8422 8423 if (kvm_apic_has_events(vcpu)) 8424 return true; 8425 8426 if (vcpu->arch.pv.pv_unhalted) 8427 return true; 8428 8429 if (kvm_test_request(KVM_REQ_NMI, vcpu) || 8430 (vcpu->arch.nmi_pending && 8431 kvm_x86_ops->nmi_allowed(vcpu))) 8432 return true; 8433 8434 if (kvm_test_request(KVM_REQ_SMI, vcpu) || 8435 (vcpu->arch.smi_pending && !is_smm(vcpu))) 8436 return true; 8437 8438 if (kvm_arch_interrupt_allowed(vcpu) && 8439 kvm_cpu_has_interrupt(vcpu)) 8440 return true; 8441 8442 if (kvm_hv_has_stimer_pending(vcpu)) 8443 return true; 8444 8445 return false; 8446 } 8447 8448 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 8449 { 8450 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu); 8451 } 8452 8453 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 8454 { 8455 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 8456 } 8457 8458 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) 8459 { 8460 return kvm_x86_ops->interrupt_allowed(vcpu); 8461 } 8462 8463 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu) 8464 { 8465 if (is_64_bit_mode(vcpu)) 8466 return kvm_rip_read(vcpu); 8467 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) + 8468 kvm_rip_read(vcpu)); 8469 } 8470 EXPORT_SYMBOL_GPL(kvm_get_linear_rip); 8471 8472 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip) 8473 { 8474 return kvm_get_linear_rip(vcpu) == linear_rip; 8475 } 8476 EXPORT_SYMBOL_GPL(kvm_is_linear_rip); 8477 8478 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) 8479 { 8480 unsigned long rflags; 8481 8482 rflags = kvm_x86_ops->get_rflags(vcpu); 8483 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 8484 rflags &= ~X86_EFLAGS_TF; 8485 return rflags; 8486 } 8487 EXPORT_SYMBOL_GPL(kvm_get_rflags); 8488 8489 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 8490 { 8491 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && 8492 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip)) 8493 rflags |= X86_EFLAGS_TF; 8494 kvm_x86_ops->set_rflags(vcpu, rflags); 8495 } 8496 8497 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 8498 { 8499 __kvm_set_rflags(vcpu, rflags); 8500 kvm_make_request(KVM_REQ_EVENT, vcpu); 8501 } 8502 EXPORT_SYMBOL_GPL(kvm_set_rflags); 8503 8504 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work) 8505 { 8506 int r; 8507 8508 if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) || 8509 work->wakeup_all) 8510 return; 8511 8512 r = kvm_mmu_reload(vcpu); 8513 if (unlikely(r)) 8514 return; 8515 8516 if (!vcpu->arch.mmu.direct_map && 8517 work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu)) 8518 return; 8519 8520 vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true); 8521 } 8522 8523 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) 8524 { 8525 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); 8526 } 8527 8528 static inline u32 kvm_async_pf_next_probe(u32 key) 8529 { 8530 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1); 8531 } 8532 8533 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 8534 { 8535 u32 key = kvm_async_pf_hash_fn(gfn); 8536 8537 while (vcpu->arch.apf.gfns[key] != ~0) 8538 key = kvm_async_pf_next_probe(key); 8539 8540 vcpu->arch.apf.gfns[key] = gfn; 8541 } 8542 8543 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) 8544 { 8545 int i; 8546 u32 key = kvm_async_pf_hash_fn(gfn); 8547 8548 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) && 8549 (vcpu->arch.apf.gfns[key] != gfn && 8550 vcpu->arch.apf.gfns[key] != ~0); i++) 8551 key = kvm_async_pf_next_probe(key); 8552 8553 return key; 8554 } 8555 8556 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 8557 { 8558 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; 8559 } 8560 8561 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 8562 { 8563 u32 i, j, k; 8564 8565 i = j = kvm_async_pf_gfn_slot(vcpu, gfn); 8566 while (true) { 8567 vcpu->arch.apf.gfns[i] = ~0; 8568 do { 8569 j = kvm_async_pf_next_probe(j); 8570 if (vcpu->arch.apf.gfns[j] == ~0) 8571 return; 8572 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); 8573 /* 8574 * k lies cyclically in ]i,j] 8575 * | i.k.j | 8576 * |....j i.k.| or |.k..j i...| 8577 */ 8578 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); 8579 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; 8580 i = j; 8581 } 8582 } 8583 8584 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val) 8585 { 8586 8587 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val, 8588 sizeof(val)); 8589 } 8590 8591 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 8592 struct kvm_async_pf *work) 8593 { 8594 struct x86_exception fault; 8595 8596 trace_kvm_async_pf_not_present(work->arch.token, work->gva); 8597 kvm_add_async_pf_gfn(vcpu, work->arch.gfn); 8598 8599 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) || 8600 (vcpu->arch.apf.send_user_only && 8601 kvm_x86_ops->get_cpl(vcpu) == 0)) 8602 kvm_make_request(KVM_REQ_APF_HALT, vcpu); 8603 else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) { 8604 fault.vector = PF_VECTOR; 8605 fault.error_code_valid = true; 8606 fault.error_code = 0; 8607 fault.nested_page_fault = false; 8608 fault.address = work->arch.token; 8609 fault.async_page_fault = true; 8610 kvm_inject_page_fault(vcpu, &fault); 8611 } 8612 } 8613 8614 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 8615 struct kvm_async_pf *work) 8616 { 8617 struct x86_exception fault; 8618 8619 if (work->wakeup_all) 8620 work->arch.token = ~0; /* broadcast wakeup */ 8621 else 8622 kvm_del_async_pf_gfn(vcpu, work->arch.gfn); 8623 trace_kvm_async_pf_ready(work->arch.token, work->gva); 8624 8625 if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) && 8626 !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) { 8627 fault.vector = PF_VECTOR; 8628 fault.error_code_valid = true; 8629 fault.error_code = 0; 8630 fault.nested_page_fault = false; 8631 fault.address = work->arch.token; 8632 fault.async_page_fault = true; 8633 kvm_inject_page_fault(vcpu, &fault); 8634 } 8635 vcpu->arch.apf.halted = false; 8636 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; 8637 } 8638 8639 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) 8640 { 8641 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED)) 8642 return true; 8643 else 8644 return kvm_can_do_async_pf(vcpu); 8645 } 8646 8647 void kvm_arch_start_assignment(struct kvm *kvm) 8648 { 8649 atomic_inc(&kvm->arch.assigned_device_count); 8650 } 8651 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment); 8652 8653 void kvm_arch_end_assignment(struct kvm *kvm) 8654 { 8655 atomic_dec(&kvm->arch.assigned_device_count); 8656 } 8657 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment); 8658 8659 bool kvm_arch_has_assigned_device(struct kvm *kvm) 8660 { 8661 return atomic_read(&kvm->arch.assigned_device_count); 8662 } 8663 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); 8664 8665 void kvm_arch_register_noncoherent_dma(struct kvm *kvm) 8666 { 8667 atomic_inc(&kvm->arch.noncoherent_dma_count); 8668 } 8669 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma); 8670 8671 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm) 8672 { 8673 atomic_dec(&kvm->arch.noncoherent_dma_count); 8674 } 8675 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma); 8676 8677 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm) 8678 { 8679 return atomic_read(&kvm->arch.noncoherent_dma_count); 8680 } 8681 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma); 8682 8683 bool kvm_arch_has_irq_bypass(void) 8684 { 8685 return kvm_x86_ops->update_pi_irte != NULL; 8686 } 8687 8688 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, 8689 struct irq_bypass_producer *prod) 8690 { 8691 struct kvm_kernel_irqfd *irqfd = 8692 container_of(cons, struct kvm_kernel_irqfd, consumer); 8693 8694 irqfd->producer = prod; 8695 8696 return kvm_x86_ops->update_pi_irte(irqfd->kvm, 8697 prod->irq, irqfd->gsi, 1); 8698 } 8699 8700 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, 8701 struct irq_bypass_producer *prod) 8702 { 8703 int ret; 8704 struct kvm_kernel_irqfd *irqfd = 8705 container_of(cons, struct kvm_kernel_irqfd, consumer); 8706 8707 WARN_ON(irqfd->producer != prod); 8708 irqfd->producer = NULL; 8709 8710 /* 8711 * When producer of consumer is unregistered, we change back to 8712 * remapped mode, so we can re-use the current implementation 8713 * when the irq is masked/disabled or the consumer side (KVM 8714 * int this case doesn't want to receive the interrupts. 8715 */ 8716 ret = kvm_x86_ops->update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 0); 8717 if (ret) 8718 printk(KERN_INFO "irq bypass consumer (token %p) unregistration" 8719 " fails: %d\n", irqfd->consumer.token, ret); 8720 } 8721 8722 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq, 8723 uint32_t guest_irq, bool set) 8724 { 8725 if (!kvm_x86_ops->update_pi_irte) 8726 return -EINVAL; 8727 8728 return kvm_x86_ops->update_pi_irte(kvm, host_irq, guest_irq, set); 8729 } 8730 8731 bool kvm_vector_hashing_enabled(void) 8732 { 8733 return vector_hashing; 8734 } 8735 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled); 8736 8737 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); 8738 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio); 8739 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); 8740 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); 8741 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); 8742 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); 8743 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); 8744 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); 8745 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); 8746 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); 8747 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); 8748 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit); 8749 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts); 8750 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset); 8751 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window); 8752 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full); 8753 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update); 8754 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access); 8755 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi); 8756