1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Kernel-based Virtual Machine driver for Linux 4 * 5 * This module enables machines with Intel VT-x extensions to run virtual 6 * machines without emulation or binary translation. 7 * 8 * Copyright (C) 2006 Qumranet, Inc. 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 */ 15 16 #include <linux/frame.h> 17 #include <linux/highmem.h> 18 #include <linux/hrtimer.h> 19 #include <linux/kernel.h> 20 #include <linux/kvm_host.h> 21 #include <linux/module.h> 22 #include <linux/moduleparam.h> 23 #include <linux/mod_devicetable.h> 24 #include <linux/mm.h> 25 #include <linux/sched.h> 26 #include <linux/sched/smt.h> 27 #include <linux/slab.h> 28 #include <linux/tboot.h> 29 #include <linux/trace_events.h> 30 #include <linux/entry-kvm.h> 31 32 #include <asm/apic.h> 33 #include <asm/asm.h> 34 #include <asm/cpu.h> 35 #include <asm/cpu_device_id.h> 36 #include <asm/debugreg.h> 37 #include <asm/desc.h> 38 #include <asm/fpu/internal.h> 39 #include <asm/io.h> 40 #include <asm/irq_remapping.h> 41 #include <asm/kexec.h> 42 #include <asm/perf_event.h> 43 #include <asm/mce.h> 44 #include <asm/mmu_context.h> 45 #include <asm/mshyperv.h> 46 #include <asm/mwait.h> 47 #include <asm/spec-ctrl.h> 48 #include <asm/virtext.h> 49 #include <asm/vmx.h> 50 51 #include "capabilities.h" 52 #include "cpuid.h" 53 #include "evmcs.h" 54 #include "irq.h" 55 #include "kvm_cache_regs.h" 56 #include "lapic.h" 57 #include "mmu.h" 58 #include "nested.h" 59 #include "ops.h" 60 #include "pmu.h" 61 #include "trace.h" 62 #include "vmcs.h" 63 #include "vmcs12.h" 64 #include "vmx.h" 65 #include "x86.h" 66 67 MODULE_AUTHOR("Qumranet"); 68 MODULE_LICENSE("GPL"); 69 70 #ifdef MODULE 71 static const struct x86_cpu_id vmx_cpu_id[] = { 72 X86_MATCH_FEATURE(X86_FEATURE_VMX, NULL), 73 {} 74 }; 75 MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id); 76 #endif 77 78 bool __read_mostly enable_vpid = 1; 79 module_param_named(vpid, enable_vpid, bool, 0444); 80 81 static bool __read_mostly enable_vnmi = 1; 82 module_param_named(vnmi, enable_vnmi, bool, S_IRUGO); 83 84 bool __read_mostly flexpriority_enabled = 1; 85 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); 86 87 bool __read_mostly enable_ept = 1; 88 module_param_named(ept, enable_ept, bool, S_IRUGO); 89 90 bool __read_mostly enable_unrestricted_guest = 1; 91 module_param_named(unrestricted_guest, 92 enable_unrestricted_guest, bool, S_IRUGO); 93 94 bool __read_mostly enable_ept_ad_bits = 1; 95 module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO); 96 97 static bool __read_mostly emulate_invalid_guest_state = true; 98 module_param(emulate_invalid_guest_state, bool, S_IRUGO); 99 100 static bool __read_mostly fasteoi = 1; 101 module_param(fasteoi, bool, S_IRUGO); 102 103 bool __read_mostly enable_apicv = 1; 104 module_param(enable_apicv, bool, S_IRUGO); 105 106 /* 107 * If nested=1, nested virtualization is supported, i.e., guests may use 108 * VMX and be a hypervisor for its own guests. If nested=0, guests may not 109 * use VMX instructions. 110 */ 111 static bool __read_mostly nested = 1; 112 module_param(nested, bool, S_IRUGO); 113 114 bool __read_mostly enable_pml = 1; 115 module_param_named(pml, enable_pml, bool, S_IRUGO); 116 117 static bool __read_mostly dump_invalid_vmcs = 0; 118 module_param(dump_invalid_vmcs, bool, 0644); 119 120 #define MSR_BITMAP_MODE_X2APIC 1 121 #define MSR_BITMAP_MODE_X2APIC_APICV 2 122 123 #define KVM_VMX_TSC_MULTIPLIER_MAX 0xffffffffffffffffULL 124 125 /* Guest_tsc -> host_tsc conversion requires 64-bit division. */ 126 static int __read_mostly cpu_preemption_timer_multi; 127 static bool __read_mostly enable_preemption_timer = 1; 128 #ifdef CONFIG_X86_64 129 module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO); 130 #endif 131 132 #define KVM_VM_CR0_ALWAYS_OFF (X86_CR0_NW | X86_CR0_CD) 133 #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST X86_CR0_NE 134 #define KVM_VM_CR0_ALWAYS_ON \ 135 (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | \ 136 X86_CR0_WP | X86_CR0_PG | X86_CR0_PE) 137 138 #define KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST X86_CR4_VMXE 139 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE) 140 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE) 141 142 #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM)) 143 144 #define MSR_IA32_RTIT_STATUS_MASK (~(RTIT_STATUS_FILTEREN | \ 145 RTIT_STATUS_CONTEXTEN | RTIT_STATUS_TRIGGEREN | \ 146 RTIT_STATUS_ERROR | RTIT_STATUS_STOPPED | \ 147 RTIT_STATUS_BYTECNT)) 148 149 #define MSR_IA32_RTIT_OUTPUT_BASE_MASK \ 150 (~((1UL << cpuid_query_maxphyaddr(vcpu)) - 1) | 0x7f) 151 152 /* 153 * These 2 parameters are used to config the controls for Pause-Loop Exiting: 154 * ple_gap: upper bound on the amount of time between two successive 155 * executions of PAUSE in a loop. Also indicate if ple enabled. 156 * According to test, this time is usually smaller than 128 cycles. 157 * ple_window: upper bound on the amount of time a guest is allowed to execute 158 * in a PAUSE loop. Tests indicate that most spinlocks are held for 159 * less than 2^12 cycles 160 * Time is measured based on a counter that runs at the same rate as the TSC, 161 * refer SDM volume 3b section 21.6.13 & 22.1.3. 162 */ 163 static unsigned int ple_gap = KVM_DEFAULT_PLE_GAP; 164 module_param(ple_gap, uint, 0444); 165 166 static unsigned int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; 167 module_param(ple_window, uint, 0444); 168 169 /* Default doubles per-vcpu window every exit. */ 170 static unsigned int ple_window_grow = KVM_DEFAULT_PLE_WINDOW_GROW; 171 module_param(ple_window_grow, uint, 0444); 172 173 /* Default resets per-vcpu window every exit to ple_window. */ 174 static unsigned int ple_window_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK; 175 module_param(ple_window_shrink, uint, 0444); 176 177 /* Default is to compute the maximum so we can never overflow. */ 178 static unsigned int ple_window_max = KVM_VMX_DEFAULT_PLE_WINDOW_MAX; 179 module_param(ple_window_max, uint, 0444); 180 181 /* Default is SYSTEM mode, 1 for host-guest mode */ 182 int __read_mostly pt_mode = PT_MODE_SYSTEM; 183 module_param(pt_mode, int, S_IRUGO); 184 185 static DEFINE_STATIC_KEY_FALSE(vmx_l1d_should_flush); 186 static DEFINE_STATIC_KEY_FALSE(vmx_l1d_flush_cond); 187 static DEFINE_MUTEX(vmx_l1d_flush_mutex); 188 189 /* Storage for pre module init parameter parsing */ 190 static enum vmx_l1d_flush_state __read_mostly vmentry_l1d_flush_param = VMENTER_L1D_FLUSH_AUTO; 191 192 static const struct { 193 const char *option; 194 bool for_parse; 195 } vmentry_l1d_param[] = { 196 [VMENTER_L1D_FLUSH_AUTO] = {"auto", true}, 197 [VMENTER_L1D_FLUSH_NEVER] = {"never", true}, 198 [VMENTER_L1D_FLUSH_COND] = {"cond", true}, 199 [VMENTER_L1D_FLUSH_ALWAYS] = {"always", true}, 200 [VMENTER_L1D_FLUSH_EPT_DISABLED] = {"EPT disabled", false}, 201 [VMENTER_L1D_FLUSH_NOT_REQUIRED] = {"not required", false}, 202 }; 203 204 #define L1D_CACHE_ORDER 4 205 static void *vmx_l1d_flush_pages; 206 207 static int vmx_setup_l1d_flush(enum vmx_l1d_flush_state l1tf) 208 { 209 struct page *page; 210 unsigned int i; 211 212 if (!boot_cpu_has_bug(X86_BUG_L1TF)) { 213 l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_NOT_REQUIRED; 214 return 0; 215 } 216 217 if (!enable_ept) { 218 l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_EPT_DISABLED; 219 return 0; 220 } 221 222 if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) { 223 u64 msr; 224 225 rdmsrl(MSR_IA32_ARCH_CAPABILITIES, msr); 226 if (msr & ARCH_CAP_SKIP_VMENTRY_L1DFLUSH) { 227 l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_NOT_REQUIRED; 228 return 0; 229 } 230 } 231 232 /* If set to auto use the default l1tf mitigation method */ 233 if (l1tf == VMENTER_L1D_FLUSH_AUTO) { 234 switch (l1tf_mitigation) { 235 case L1TF_MITIGATION_OFF: 236 l1tf = VMENTER_L1D_FLUSH_NEVER; 237 break; 238 case L1TF_MITIGATION_FLUSH_NOWARN: 239 case L1TF_MITIGATION_FLUSH: 240 case L1TF_MITIGATION_FLUSH_NOSMT: 241 l1tf = VMENTER_L1D_FLUSH_COND; 242 break; 243 case L1TF_MITIGATION_FULL: 244 case L1TF_MITIGATION_FULL_FORCE: 245 l1tf = VMENTER_L1D_FLUSH_ALWAYS; 246 break; 247 } 248 } else if (l1tf_mitigation == L1TF_MITIGATION_FULL_FORCE) { 249 l1tf = VMENTER_L1D_FLUSH_ALWAYS; 250 } 251 252 if (l1tf != VMENTER_L1D_FLUSH_NEVER && !vmx_l1d_flush_pages && 253 !boot_cpu_has(X86_FEATURE_FLUSH_L1D)) { 254 /* 255 * This allocation for vmx_l1d_flush_pages is not tied to a VM 256 * lifetime and so should not be charged to a memcg. 257 */ 258 page = alloc_pages(GFP_KERNEL, L1D_CACHE_ORDER); 259 if (!page) 260 return -ENOMEM; 261 vmx_l1d_flush_pages = page_address(page); 262 263 /* 264 * Initialize each page with a different pattern in 265 * order to protect against KSM in the nested 266 * virtualization case. 267 */ 268 for (i = 0; i < 1u << L1D_CACHE_ORDER; ++i) { 269 memset(vmx_l1d_flush_pages + i * PAGE_SIZE, i + 1, 270 PAGE_SIZE); 271 } 272 } 273 274 l1tf_vmx_mitigation = l1tf; 275 276 if (l1tf != VMENTER_L1D_FLUSH_NEVER) 277 static_branch_enable(&vmx_l1d_should_flush); 278 else 279 static_branch_disable(&vmx_l1d_should_flush); 280 281 if (l1tf == VMENTER_L1D_FLUSH_COND) 282 static_branch_enable(&vmx_l1d_flush_cond); 283 else 284 static_branch_disable(&vmx_l1d_flush_cond); 285 return 0; 286 } 287 288 static int vmentry_l1d_flush_parse(const char *s) 289 { 290 unsigned int i; 291 292 if (s) { 293 for (i = 0; i < ARRAY_SIZE(vmentry_l1d_param); i++) { 294 if (vmentry_l1d_param[i].for_parse && 295 sysfs_streq(s, vmentry_l1d_param[i].option)) 296 return i; 297 } 298 } 299 return -EINVAL; 300 } 301 302 static int vmentry_l1d_flush_set(const char *s, const struct kernel_param *kp) 303 { 304 int l1tf, ret; 305 306 l1tf = vmentry_l1d_flush_parse(s); 307 if (l1tf < 0) 308 return l1tf; 309 310 if (!boot_cpu_has(X86_BUG_L1TF)) 311 return 0; 312 313 /* 314 * Has vmx_init() run already? If not then this is the pre init 315 * parameter parsing. In that case just store the value and let 316 * vmx_init() do the proper setup after enable_ept has been 317 * established. 318 */ 319 if (l1tf_vmx_mitigation == VMENTER_L1D_FLUSH_AUTO) { 320 vmentry_l1d_flush_param = l1tf; 321 return 0; 322 } 323 324 mutex_lock(&vmx_l1d_flush_mutex); 325 ret = vmx_setup_l1d_flush(l1tf); 326 mutex_unlock(&vmx_l1d_flush_mutex); 327 return ret; 328 } 329 330 static int vmentry_l1d_flush_get(char *s, const struct kernel_param *kp) 331 { 332 if (WARN_ON_ONCE(l1tf_vmx_mitigation >= ARRAY_SIZE(vmentry_l1d_param))) 333 return sprintf(s, "???\n"); 334 335 return sprintf(s, "%s\n", vmentry_l1d_param[l1tf_vmx_mitigation].option); 336 } 337 338 static const struct kernel_param_ops vmentry_l1d_flush_ops = { 339 .set = vmentry_l1d_flush_set, 340 .get = vmentry_l1d_flush_get, 341 }; 342 module_param_cb(vmentry_l1d_flush, &vmentry_l1d_flush_ops, NULL, 0644); 343 344 static bool guest_state_valid(struct kvm_vcpu *vcpu); 345 static u32 vmx_segment_access_rights(struct kvm_segment *var); 346 static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, 347 u32 msr, int type); 348 349 void vmx_vmexit(void); 350 351 #define vmx_insn_failed(fmt...) \ 352 do { \ 353 WARN_ONCE(1, fmt); \ 354 pr_warn_ratelimited(fmt); \ 355 } while (0) 356 357 asmlinkage void vmread_error(unsigned long field, bool fault) 358 { 359 if (fault) 360 kvm_spurious_fault(); 361 else 362 vmx_insn_failed("kvm: vmread failed: field=%lx\n", field); 363 } 364 365 noinline void vmwrite_error(unsigned long field, unsigned long value) 366 { 367 vmx_insn_failed("kvm: vmwrite failed: field=%lx val=%lx err=%d\n", 368 field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); 369 } 370 371 noinline void vmclear_error(struct vmcs *vmcs, u64 phys_addr) 372 { 373 vmx_insn_failed("kvm: vmclear failed: %p/%llx\n", vmcs, phys_addr); 374 } 375 376 noinline void vmptrld_error(struct vmcs *vmcs, u64 phys_addr) 377 { 378 vmx_insn_failed("kvm: vmptrld failed: %p/%llx\n", vmcs, phys_addr); 379 } 380 381 noinline void invvpid_error(unsigned long ext, u16 vpid, gva_t gva) 382 { 383 vmx_insn_failed("kvm: invvpid failed: ext=0x%lx vpid=%u gva=0x%lx\n", 384 ext, vpid, gva); 385 } 386 387 noinline void invept_error(unsigned long ext, u64 eptp, gpa_t gpa) 388 { 389 vmx_insn_failed("kvm: invept failed: ext=0x%lx eptp=%llx gpa=0x%llx\n", 390 ext, eptp, gpa); 391 } 392 393 static DEFINE_PER_CPU(struct vmcs *, vmxarea); 394 DEFINE_PER_CPU(struct vmcs *, current_vmcs); 395 /* 396 * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed 397 * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it. 398 */ 399 static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu); 400 401 /* 402 * We maintian a per-CPU linked-list of vCPU, so in wakeup_handler() we 403 * can find which vCPU should be waken up. 404 */ 405 static DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu); 406 static DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock); 407 408 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); 409 static DEFINE_SPINLOCK(vmx_vpid_lock); 410 411 struct vmcs_config vmcs_config; 412 struct vmx_capability vmx_capability; 413 414 #define VMX_SEGMENT_FIELD(seg) \ 415 [VCPU_SREG_##seg] = { \ 416 .selector = GUEST_##seg##_SELECTOR, \ 417 .base = GUEST_##seg##_BASE, \ 418 .limit = GUEST_##seg##_LIMIT, \ 419 .ar_bytes = GUEST_##seg##_AR_BYTES, \ 420 } 421 422 static const struct kvm_vmx_segment_field { 423 unsigned selector; 424 unsigned base; 425 unsigned limit; 426 unsigned ar_bytes; 427 } kvm_vmx_segment_fields[] = { 428 VMX_SEGMENT_FIELD(CS), 429 VMX_SEGMENT_FIELD(DS), 430 VMX_SEGMENT_FIELD(ES), 431 VMX_SEGMENT_FIELD(FS), 432 VMX_SEGMENT_FIELD(GS), 433 VMX_SEGMENT_FIELD(SS), 434 VMX_SEGMENT_FIELD(TR), 435 VMX_SEGMENT_FIELD(LDTR), 436 }; 437 438 static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx) 439 { 440 vmx->segment_cache.bitmask = 0; 441 } 442 443 static unsigned long host_idt_base; 444 445 /* 446 * Though SYSCALL is only supported in 64-bit mode on Intel CPUs, kvm 447 * will emulate SYSCALL in legacy mode if the vendor string in guest 448 * CPUID.0:{EBX,ECX,EDX} is "AuthenticAMD" or "AMDisbetter!" To 449 * support this emulation, IA32_STAR must always be included in 450 * vmx_msr_index[], even in i386 builds. 451 */ 452 const u32 vmx_msr_index[] = { 453 #ifdef CONFIG_X86_64 454 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, 455 #endif 456 MSR_EFER, MSR_TSC_AUX, MSR_STAR, 457 MSR_IA32_TSX_CTRL, 458 }; 459 460 #if IS_ENABLED(CONFIG_HYPERV) 461 static bool __read_mostly enlightened_vmcs = true; 462 module_param(enlightened_vmcs, bool, 0444); 463 464 /* check_ept_pointer() should be under protection of ept_pointer_lock. */ 465 static void check_ept_pointer_match(struct kvm *kvm) 466 { 467 struct kvm_vcpu *vcpu; 468 u64 tmp_eptp = INVALID_PAGE; 469 int i; 470 471 kvm_for_each_vcpu(i, vcpu, kvm) { 472 if (!VALID_PAGE(tmp_eptp)) { 473 tmp_eptp = to_vmx(vcpu)->ept_pointer; 474 } else if (tmp_eptp != to_vmx(vcpu)->ept_pointer) { 475 to_kvm_vmx(kvm)->ept_pointers_match 476 = EPT_POINTERS_MISMATCH; 477 return; 478 } 479 } 480 481 to_kvm_vmx(kvm)->ept_pointers_match = EPT_POINTERS_MATCH; 482 } 483 484 static int kvm_fill_hv_flush_list_func(struct hv_guest_mapping_flush_list *flush, 485 void *data) 486 { 487 struct kvm_tlb_range *range = data; 488 489 return hyperv_fill_flush_guest_mapping_list(flush, range->start_gfn, 490 range->pages); 491 } 492 493 static inline int __hv_remote_flush_tlb_with_range(struct kvm *kvm, 494 struct kvm_vcpu *vcpu, struct kvm_tlb_range *range) 495 { 496 u64 ept_pointer = to_vmx(vcpu)->ept_pointer; 497 498 /* 499 * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs address 500 * of the base of EPT PML4 table, strip off EPT configuration 501 * information. 502 */ 503 if (range) 504 return hyperv_flush_guest_mapping_range(ept_pointer & PAGE_MASK, 505 kvm_fill_hv_flush_list_func, (void *)range); 506 else 507 return hyperv_flush_guest_mapping(ept_pointer & PAGE_MASK); 508 } 509 510 static int hv_remote_flush_tlb_with_range(struct kvm *kvm, 511 struct kvm_tlb_range *range) 512 { 513 struct kvm_vcpu *vcpu; 514 int ret = 0, i; 515 516 spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock); 517 518 if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK) 519 check_ept_pointer_match(kvm); 520 521 if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) { 522 kvm_for_each_vcpu(i, vcpu, kvm) { 523 /* If ept_pointer is invalid pointer, bypass flush request. */ 524 if (VALID_PAGE(to_vmx(vcpu)->ept_pointer)) 525 ret |= __hv_remote_flush_tlb_with_range( 526 kvm, vcpu, range); 527 } 528 } else { 529 ret = __hv_remote_flush_tlb_with_range(kvm, 530 kvm_get_vcpu(kvm, 0), range); 531 } 532 533 spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); 534 return ret; 535 } 536 static int hv_remote_flush_tlb(struct kvm *kvm) 537 { 538 return hv_remote_flush_tlb_with_range(kvm, NULL); 539 } 540 541 static int hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) 542 { 543 struct hv_enlightened_vmcs *evmcs; 544 struct hv_partition_assist_pg **p_hv_pa_pg = 545 &vcpu->kvm->arch.hyperv.hv_pa_pg; 546 /* 547 * Synthetic VM-Exit is not enabled in current code and so All 548 * evmcs in singe VM shares same assist page. 549 */ 550 if (!*p_hv_pa_pg) 551 *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL); 552 553 if (!*p_hv_pa_pg) 554 return -ENOMEM; 555 556 evmcs = (struct hv_enlightened_vmcs *)to_vmx(vcpu)->loaded_vmcs->vmcs; 557 558 evmcs->partition_assist_page = 559 __pa(*p_hv_pa_pg); 560 evmcs->hv_vm_id = (unsigned long)vcpu->kvm; 561 evmcs->hv_enlightenments_control.nested_flush_hypercall = 1; 562 563 return 0; 564 } 565 566 #endif /* IS_ENABLED(CONFIG_HYPERV) */ 567 568 /* 569 * Comment's format: document - errata name - stepping - processor name. 570 * Refer from 571 * https://www.virtualbox.org/svn/vbox/trunk/src/VBox/VMM/VMMR0/HMR0.cpp 572 */ 573 static u32 vmx_preemption_cpu_tfms[] = { 574 /* 323344.pdf - BA86 - D0 - Xeon 7500 Series */ 575 0x000206E6, 576 /* 323056.pdf - AAX65 - C2 - Xeon L3406 */ 577 /* 322814.pdf - AAT59 - C2 - i7-600, i5-500, i5-400 and i3-300 Mobile */ 578 /* 322911.pdf - AAU65 - C2 - i5-600, i3-500 Desktop and Pentium G6950 */ 579 0x00020652, 580 /* 322911.pdf - AAU65 - K0 - i5-600, i3-500 Desktop and Pentium G6950 */ 581 0x00020655, 582 /* 322373.pdf - AAO95 - B1 - Xeon 3400 Series */ 583 /* 322166.pdf - AAN92 - B1 - i7-800 and i5-700 Desktop */ 584 /* 585 * 320767.pdf - AAP86 - B1 - 586 * i7-900 Mobile Extreme, i7-800 and i7-700 Mobile 587 */ 588 0x000106E5, 589 /* 321333.pdf - AAM126 - C0 - Xeon 3500 */ 590 0x000106A0, 591 /* 321333.pdf - AAM126 - C1 - Xeon 3500 */ 592 0x000106A1, 593 /* 320836.pdf - AAJ124 - C0 - i7-900 Desktop Extreme and i7-900 Desktop */ 594 0x000106A4, 595 /* 321333.pdf - AAM126 - D0 - Xeon 3500 */ 596 /* 321324.pdf - AAK139 - D0 - Xeon 5500 */ 597 /* 320836.pdf - AAJ124 - D0 - i7-900 Extreme and i7-900 Desktop */ 598 0x000106A5, 599 /* Xeon E3-1220 V2 */ 600 0x000306A8, 601 }; 602 603 static inline bool cpu_has_broken_vmx_preemption_timer(void) 604 { 605 u32 eax = cpuid_eax(0x00000001), i; 606 607 /* Clear the reserved bits */ 608 eax &= ~(0x3U << 14 | 0xfU << 28); 609 for (i = 0; i < ARRAY_SIZE(vmx_preemption_cpu_tfms); i++) 610 if (eax == vmx_preemption_cpu_tfms[i]) 611 return true; 612 613 return false; 614 } 615 616 static inline bool cpu_need_virtualize_apic_accesses(struct kvm_vcpu *vcpu) 617 { 618 return flexpriority_enabled && lapic_in_kernel(vcpu); 619 } 620 621 static inline bool report_flexpriority(void) 622 { 623 return flexpriority_enabled; 624 } 625 626 static inline int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) 627 { 628 int i; 629 630 for (i = 0; i < vmx->nmsrs; ++i) 631 if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) 632 return i; 633 return -1; 634 } 635 636 struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) 637 { 638 int i; 639 640 i = __find_msr_index(vmx, msr); 641 if (i >= 0) 642 return &vmx->guest_msrs[i]; 643 return NULL; 644 } 645 646 static int vmx_set_guest_msr(struct vcpu_vmx *vmx, struct shared_msr_entry *msr, u64 data) 647 { 648 int ret = 0; 649 650 u64 old_msr_data = msr->data; 651 msr->data = data; 652 if (msr - vmx->guest_msrs < vmx->save_nmsrs) { 653 preempt_disable(); 654 ret = kvm_set_shared_msr(msr->index, msr->data, 655 msr->mask); 656 preempt_enable(); 657 if (ret) 658 msr->data = old_msr_data; 659 } 660 return ret; 661 } 662 663 #ifdef CONFIG_KEXEC_CORE 664 static void crash_vmclear_local_loaded_vmcss(void) 665 { 666 int cpu = raw_smp_processor_id(); 667 struct loaded_vmcs *v; 668 669 list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu), 670 loaded_vmcss_on_cpu_link) 671 vmcs_clear(v->vmcs); 672 } 673 #endif /* CONFIG_KEXEC_CORE */ 674 675 static void __loaded_vmcs_clear(void *arg) 676 { 677 struct loaded_vmcs *loaded_vmcs = arg; 678 int cpu = raw_smp_processor_id(); 679 680 if (loaded_vmcs->cpu != cpu) 681 return; /* vcpu migration can race with cpu offline */ 682 if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs) 683 per_cpu(current_vmcs, cpu) = NULL; 684 685 vmcs_clear(loaded_vmcs->vmcs); 686 if (loaded_vmcs->shadow_vmcs && loaded_vmcs->launched) 687 vmcs_clear(loaded_vmcs->shadow_vmcs); 688 689 list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link); 690 691 /* 692 * Ensure all writes to loaded_vmcs, including deleting it from its 693 * current percpu list, complete before setting loaded_vmcs->vcpu to 694 * -1, otherwise a different cpu can see vcpu == -1 first and add 695 * loaded_vmcs to its percpu list before it's deleted from this cpu's 696 * list. Pairs with the smp_rmb() in vmx_vcpu_load_vmcs(). 697 */ 698 smp_wmb(); 699 700 loaded_vmcs->cpu = -1; 701 loaded_vmcs->launched = 0; 702 } 703 704 void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs) 705 { 706 int cpu = loaded_vmcs->cpu; 707 708 if (cpu != -1) 709 smp_call_function_single(cpu, 710 __loaded_vmcs_clear, loaded_vmcs, 1); 711 } 712 713 static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg, 714 unsigned field) 715 { 716 bool ret; 717 u32 mask = 1 << (seg * SEG_FIELD_NR + field); 718 719 if (!kvm_register_is_available(&vmx->vcpu, VCPU_EXREG_SEGMENTS)) { 720 kvm_register_mark_available(&vmx->vcpu, VCPU_EXREG_SEGMENTS); 721 vmx->segment_cache.bitmask = 0; 722 } 723 ret = vmx->segment_cache.bitmask & mask; 724 vmx->segment_cache.bitmask |= mask; 725 return ret; 726 } 727 728 static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg) 729 { 730 u16 *p = &vmx->segment_cache.seg[seg].selector; 731 732 if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL)) 733 *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector); 734 return *p; 735 } 736 737 static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg) 738 { 739 ulong *p = &vmx->segment_cache.seg[seg].base; 740 741 if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE)) 742 *p = vmcs_readl(kvm_vmx_segment_fields[seg].base); 743 return *p; 744 } 745 746 static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg) 747 { 748 u32 *p = &vmx->segment_cache.seg[seg].limit; 749 750 if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT)) 751 *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit); 752 return *p; 753 } 754 755 static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg) 756 { 757 u32 *p = &vmx->segment_cache.seg[seg].ar; 758 759 if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR)) 760 *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes); 761 return *p; 762 } 763 764 void update_exception_bitmap(struct kvm_vcpu *vcpu) 765 { 766 u32 eb; 767 768 eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) | 769 (1u << DB_VECTOR) | (1u << AC_VECTOR); 770 /* 771 * Guest access to VMware backdoor ports could legitimately 772 * trigger #GP because of TSS I/O permission bitmap. 773 * We intercept those #GP and allow access to them anyway 774 * as VMware does. 775 */ 776 if (enable_vmware_backdoor) 777 eb |= (1u << GP_VECTOR); 778 if ((vcpu->guest_debug & 779 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) == 780 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) 781 eb |= 1u << BP_VECTOR; 782 if (to_vmx(vcpu)->rmode.vm86_active) 783 eb = ~0; 784 if (!vmx_need_pf_intercept(vcpu)) 785 eb &= ~(1u << PF_VECTOR); 786 787 /* When we are running a nested L2 guest and L1 specified for it a 788 * certain exception bitmap, we must trap the same exceptions and pass 789 * them to L1. When running L2, we will only handle the exceptions 790 * specified above if L1 did not want them. 791 */ 792 if (is_guest_mode(vcpu)) 793 eb |= get_vmcs12(vcpu)->exception_bitmap; 794 795 vmcs_write32(EXCEPTION_BITMAP, eb); 796 } 797 798 /* 799 * Check if MSR is intercepted for currently loaded MSR bitmap. 800 */ 801 static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr) 802 { 803 unsigned long *msr_bitmap; 804 int f = sizeof(unsigned long); 805 806 if (!cpu_has_vmx_msr_bitmap()) 807 return true; 808 809 msr_bitmap = to_vmx(vcpu)->loaded_vmcs->msr_bitmap; 810 811 if (msr <= 0x1fff) { 812 return !!test_bit(msr, msr_bitmap + 0x800 / f); 813 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { 814 msr &= 0x1fff; 815 return !!test_bit(msr, msr_bitmap + 0xc00 / f); 816 } 817 818 return true; 819 } 820 821 static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx, 822 unsigned long entry, unsigned long exit) 823 { 824 vm_entry_controls_clearbit(vmx, entry); 825 vm_exit_controls_clearbit(vmx, exit); 826 } 827 828 int vmx_find_msr_index(struct vmx_msrs *m, u32 msr) 829 { 830 unsigned int i; 831 832 for (i = 0; i < m->nr; ++i) { 833 if (m->val[i].index == msr) 834 return i; 835 } 836 return -ENOENT; 837 } 838 839 static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) 840 { 841 int i; 842 struct msr_autoload *m = &vmx->msr_autoload; 843 844 switch (msr) { 845 case MSR_EFER: 846 if (cpu_has_load_ia32_efer()) { 847 clear_atomic_switch_msr_special(vmx, 848 VM_ENTRY_LOAD_IA32_EFER, 849 VM_EXIT_LOAD_IA32_EFER); 850 return; 851 } 852 break; 853 case MSR_CORE_PERF_GLOBAL_CTRL: 854 if (cpu_has_load_perf_global_ctrl()) { 855 clear_atomic_switch_msr_special(vmx, 856 VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, 857 VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); 858 return; 859 } 860 break; 861 } 862 i = vmx_find_msr_index(&m->guest, msr); 863 if (i < 0) 864 goto skip_guest; 865 --m->guest.nr; 866 m->guest.val[i] = m->guest.val[m->guest.nr]; 867 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); 868 869 skip_guest: 870 i = vmx_find_msr_index(&m->host, msr); 871 if (i < 0) 872 return; 873 874 --m->host.nr; 875 m->host.val[i] = m->host.val[m->host.nr]; 876 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); 877 } 878 879 static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, 880 unsigned long entry, unsigned long exit, 881 unsigned long guest_val_vmcs, unsigned long host_val_vmcs, 882 u64 guest_val, u64 host_val) 883 { 884 vmcs_write64(guest_val_vmcs, guest_val); 885 if (host_val_vmcs != HOST_IA32_EFER) 886 vmcs_write64(host_val_vmcs, host_val); 887 vm_entry_controls_setbit(vmx, entry); 888 vm_exit_controls_setbit(vmx, exit); 889 } 890 891 static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, 892 u64 guest_val, u64 host_val, bool entry_only) 893 { 894 int i, j = 0; 895 struct msr_autoload *m = &vmx->msr_autoload; 896 897 switch (msr) { 898 case MSR_EFER: 899 if (cpu_has_load_ia32_efer()) { 900 add_atomic_switch_msr_special(vmx, 901 VM_ENTRY_LOAD_IA32_EFER, 902 VM_EXIT_LOAD_IA32_EFER, 903 GUEST_IA32_EFER, 904 HOST_IA32_EFER, 905 guest_val, host_val); 906 return; 907 } 908 break; 909 case MSR_CORE_PERF_GLOBAL_CTRL: 910 if (cpu_has_load_perf_global_ctrl()) { 911 add_atomic_switch_msr_special(vmx, 912 VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, 913 VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL, 914 GUEST_IA32_PERF_GLOBAL_CTRL, 915 HOST_IA32_PERF_GLOBAL_CTRL, 916 guest_val, host_val); 917 return; 918 } 919 break; 920 case MSR_IA32_PEBS_ENABLE: 921 /* PEBS needs a quiescent period after being disabled (to write 922 * a record). Disabling PEBS through VMX MSR swapping doesn't 923 * provide that period, so a CPU could write host's record into 924 * guest's memory. 925 */ 926 wrmsrl(MSR_IA32_PEBS_ENABLE, 0); 927 } 928 929 i = vmx_find_msr_index(&m->guest, msr); 930 if (!entry_only) 931 j = vmx_find_msr_index(&m->host, msr); 932 933 if ((i < 0 && m->guest.nr == NR_LOADSTORE_MSRS) || 934 (j < 0 && m->host.nr == NR_LOADSTORE_MSRS)) { 935 printk_once(KERN_WARNING "Not enough msr switch entries. " 936 "Can't add msr %x\n", msr); 937 return; 938 } 939 if (i < 0) { 940 i = m->guest.nr++; 941 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); 942 } 943 m->guest.val[i].index = msr; 944 m->guest.val[i].value = guest_val; 945 946 if (entry_only) 947 return; 948 949 if (j < 0) { 950 j = m->host.nr++; 951 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); 952 } 953 m->host.val[j].index = msr; 954 m->host.val[j].value = host_val; 955 } 956 957 static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) 958 { 959 u64 guest_efer = vmx->vcpu.arch.efer; 960 u64 ignore_bits = 0; 961 962 /* Shadow paging assumes NX to be available. */ 963 if (!enable_ept) 964 guest_efer |= EFER_NX; 965 966 /* 967 * LMA and LME handled by hardware; SCE meaningless outside long mode. 968 */ 969 ignore_bits |= EFER_SCE; 970 #ifdef CONFIG_X86_64 971 ignore_bits |= EFER_LMA | EFER_LME; 972 /* SCE is meaningful only in long mode on Intel */ 973 if (guest_efer & EFER_LMA) 974 ignore_bits &= ~(u64)EFER_SCE; 975 #endif 976 977 /* 978 * On EPT, we can't emulate NX, so we must switch EFER atomically. 979 * On CPUs that support "load IA32_EFER", always switch EFER 980 * atomically, since it's faster than switching it manually. 981 */ 982 if (cpu_has_load_ia32_efer() || 983 (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX))) { 984 if (!(guest_efer & EFER_LMA)) 985 guest_efer &= ~EFER_LME; 986 if (guest_efer != host_efer) 987 add_atomic_switch_msr(vmx, MSR_EFER, 988 guest_efer, host_efer, false); 989 else 990 clear_atomic_switch_msr(vmx, MSR_EFER); 991 return false; 992 } else { 993 clear_atomic_switch_msr(vmx, MSR_EFER); 994 995 guest_efer &= ~ignore_bits; 996 guest_efer |= host_efer & ignore_bits; 997 998 vmx->guest_msrs[efer_offset].data = guest_efer; 999 vmx->guest_msrs[efer_offset].mask = ~ignore_bits; 1000 1001 return true; 1002 } 1003 } 1004 1005 #ifdef CONFIG_X86_32 1006 /* 1007 * On 32-bit kernels, VM exits still load the FS and GS bases from the 1008 * VMCS rather than the segment table. KVM uses this helper to figure 1009 * out the current bases to poke them into the VMCS before entry. 1010 */ 1011 static unsigned long segment_base(u16 selector) 1012 { 1013 struct desc_struct *table; 1014 unsigned long v; 1015 1016 if (!(selector & ~SEGMENT_RPL_MASK)) 1017 return 0; 1018 1019 table = get_current_gdt_ro(); 1020 1021 if ((selector & SEGMENT_TI_MASK) == SEGMENT_LDT) { 1022 u16 ldt_selector = kvm_read_ldt(); 1023 1024 if (!(ldt_selector & ~SEGMENT_RPL_MASK)) 1025 return 0; 1026 1027 table = (struct desc_struct *)segment_base(ldt_selector); 1028 } 1029 v = get_desc_base(&table[selector >> 3]); 1030 return v; 1031 } 1032 #endif 1033 1034 static inline bool pt_can_write_msr(struct vcpu_vmx *vmx) 1035 { 1036 return vmx_pt_mode_is_host_guest() && 1037 !(vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN); 1038 } 1039 1040 static inline void pt_load_msr(struct pt_ctx *ctx, u32 addr_range) 1041 { 1042 u32 i; 1043 1044 wrmsrl(MSR_IA32_RTIT_STATUS, ctx->status); 1045 wrmsrl(MSR_IA32_RTIT_OUTPUT_BASE, ctx->output_base); 1046 wrmsrl(MSR_IA32_RTIT_OUTPUT_MASK, ctx->output_mask); 1047 wrmsrl(MSR_IA32_RTIT_CR3_MATCH, ctx->cr3_match); 1048 for (i = 0; i < addr_range; i++) { 1049 wrmsrl(MSR_IA32_RTIT_ADDR0_A + i * 2, ctx->addr_a[i]); 1050 wrmsrl(MSR_IA32_RTIT_ADDR0_B + i * 2, ctx->addr_b[i]); 1051 } 1052 } 1053 1054 static inline void pt_save_msr(struct pt_ctx *ctx, u32 addr_range) 1055 { 1056 u32 i; 1057 1058 rdmsrl(MSR_IA32_RTIT_STATUS, ctx->status); 1059 rdmsrl(MSR_IA32_RTIT_OUTPUT_BASE, ctx->output_base); 1060 rdmsrl(MSR_IA32_RTIT_OUTPUT_MASK, ctx->output_mask); 1061 rdmsrl(MSR_IA32_RTIT_CR3_MATCH, ctx->cr3_match); 1062 for (i = 0; i < addr_range; i++) { 1063 rdmsrl(MSR_IA32_RTIT_ADDR0_A + i * 2, ctx->addr_a[i]); 1064 rdmsrl(MSR_IA32_RTIT_ADDR0_B + i * 2, ctx->addr_b[i]); 1065 } 1066 } 1067 1068 static void pt_guest_enter(struct vcpu_vmx *vmx) 1069 { 1070 if (vmx_pt_mode_is_system()) 1071 return; 1072 1073 /* 1074 * GUEST_IA32_RTIT_CTL is already set in the VMCS. 1075 * Save host state before VM entry. 1076 */ 1077 rdmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); 1078 if (vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) { 1079 wrmsrl(MSR_IA32_RTIT_CTL, 0); 1080 pt_save_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_range); 1081 pt_load_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_range); 1082 } 1083 } 1084 1085 static void pt_guest_exit(struct vcpu_vmx *vmx) 1086 { 1087 if (vmx_pt_mode_is_system()) 1088 return; 1089 1090 if (vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) { 1091 pt_save_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_range); 1092 pt_load_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_range); 1093 } 1094 1095 /* Reload host state (IA32_RTIT_CTL will be cleared on VM exit). */ 1096 wrmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); 1097 } 1098 1099 void vmx_set_host_fs_gs(struct vmcs_host_state *host, u16 fs_sel, u16 gs_sel, 1100 unsigned long fs_base, unsigned long gs_base) 1101 { 1102 if (unlikely(fs_sel != host->fs_sel)) { 1103 if (!(fs_sel & 7)) 1104 vmcs_write16(HOST_FS_SELECTOR, fs_sel); 1105 else 1106 vmcs_write16(HOST_FS_SELECTOR, 0); 1107 host->fs_sel = fs_sel; 1108 } 1109 if (unlikely(gs_sel != host->gs_sel)) { 1110 if (!(gs_sel & 7)) 1111 vmcs_write16(HOST_GS_SELECTOR, gs_sel); 1112 else 1113 vmcs_write16(HOST_GS_SELECTOR, 0); 1114 host->gs_sel = gs_sel; 1115 } 1116 if (unlikely(fs_base != host->fs_base)) { 1117 vmcs_writel(HOST_FS_BASE, fs_base); 1118 host->fs_base = fs_base; 1119 } 1120 if (unlikely(gs_base != host->gs_base)) { 1121 vmcs_writel(HOST_GS_BASE, gs_base); 1122 host->gs_base = gs_base; 1123 } 1124 } 1125 1126 void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) 1127 { 1128 struct vcpu_vmx *vmx = to_vmx(vcpu); 1129 struct vmcs_host_state *host_state; 1130 #ifdef CONFIG_X86_64 1131 int cpu = raw_smp_processor_id(); 1132 #endif 1133 unsigned long fs_base, gs_base; 1134 u16 fs_sel, gs_sel; 1135 int i; 1136 1137 vmx->req_immediate_exit = false; 1138 1139 /* 1140 * Note that guest MSRs to be saved/restored can also be changed 1141 * when guest state is loaded. This happens when guest transitions 1142 * to/from long-mode by setting MSR_EFER.LMA. 1143 */ 1144 if (!vmx->guest_msrs_ready) { 1145 vmx->guest_msrs_ready = true; 1146 for (i = 0; i < vmx->save_nmsrs; ++i) 1147 kvm_set_shared_msr(vmx->guest_msrs[i].index, 1148 vmx->guest_msrs[i].data, 1149 vmx->guest_msrs[i].mask); 1150 1151 } 1152 1153 if (vmx->nested.need_vmcs12_to_shadow_sync) 1154 nested_sync_vmcs12_to_shadow(vcpu); 1155 1156 if (vmx->guest_state_loaded) 1157 return; 1158 1159 host_state = &vmx->loaded_vmcs->host_state; 1160 1161 /* 1162 * Set host fs and gs selectors. Unfortunately, 22.2.3 does not 1163 * allow segment selectors with cpl > 0 or ti == 1. 1164 */ 1165 host_state->ldt_sel = kvm_read_ldt(); 1166 1167 #ifdef CONFIG_X86_64 1168 savesegment(ds, host_state->ds_sel); 1169 savesegment(es, host_state->es_sel); 1170 1171 gs_base = cpu_kernelmode_gs_base(cpu); 1172 if (likely(is_64bit_mm(current->mm))) { 1173 current_save_fsgs(); 1174 fs_sel = current->thread.fsindex; 1175 gs_sel = current->thread.gsindex; 1176 fs_base = current->thread.fsbase; 1177 vmx->msr_host_kernel_gs_base = current->thread.gsbase; 1178 } else { 1179 savesegment(fs, fs_sel); 1180 savesegment(gs, gs_sel); 1181 fs_base = read_msr(MSR_FS_BASE); 1182 vmx->msr_host_kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE); 1183 } 1184 1185 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); 1186 #else 1187 savesegment(fs, fs_sel); 1188 savesegment(gs, gs_sel); 1189 fs_base = segment_base(fs_sel); 1190 gs_base = segment_base(gs_sel); 1191 #endif 1192 1193 vmx_set_host_fs_gs(host_state, fs_sel, gs_sel, fs_base, gs_base); 1194 vmx->guest_state_loaded = true; 1195 } 1196 1197 static void vmx_prepare_switch_to_host(struct vcpu_vmx *vmx) 1198 { 1199 struct vmcs_host_state *host_state; 1200 1201 if (!vmx->guest_state_loaded) 1202 return; 1203 1204 host_state = &vmx->loaded_vmcs->host_state; 1205 1206 ++vmx->vcpu.stat.host_state_reload; 1207 1208 #ifdef CONFIG_X86_64 1209 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); 1210 #endif 1211 if (host_state->ldt_sel || (host_state->gs_sel & 7)) { 1212 kvm_load_ldt(host_state->ldt_sel); 1213 #ifdef CONFIG_X86_64 1214 load_gs_index(host_state->gs_sel); 1215 #else 1216 loadsegment(gs, host_state->gs_sel); 1217 #endif 1218 } 1219 if (host_state->fs_sel & 7) 1220 loadsegment(fs, host_state->fs_sel); 1221 #ifdef CONFIG_X86_64 1222 if (unlikely(host_state->ds_sel | host_state->es_sel)) { 1223 loadsegment(ds, host_state->ds_sel); 1224 loadsegment(es, host_state->es_sel); 1225 } 1226 #endif 1227 invalidate_tss_limit(); 1228 #ifdef CONFIG_X86_64 1229 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); 1230 #endif 1231 load_fixmap_gdt(raw_smp_processor_id()); 1232 vmx->guest_state_loaded = false; 1233 vmx->guest_msrs_ready = false; 1234 } 1235 1236 #ifdef CONFIG_X86_64 1237 static u64 vmx_read_guest_kernel_gs_base(struct vcpu_vmx *vmx) 1238 { 1239 preempt_disable(); 1240 if (vmx->guest_state_loaded) 1241 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); 1242 preempt_enable(); 1243 return vmx->msr_guest_kernel_gs_base; 1244 } 1245 1246 static void vmx_write_guest_kernel_gs_base(struct vcpu_vmx *vmx, u64 data) 1247 { 1248 preempt_disable(); 1249 if (vmx->guest_state_loaded) 1250 wrmsrl(MSR_KERNEL_GS_BASE, data); 1251 preempt_enable(); 1252 vmx->msr_guest_kernel_gs_base = data; 1253 } 1254 #endif 1255 1256 static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) 1257 { 1258 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 1259 struct pi_desc old, new; 1260 unsigned int dest; 1261 1262 /* 1263 * In case of hot-plug or hot-unplug, we may have to undo 1264 * vmx_vcpu_pi_put even if there is no assigned device. And we 1265 * always keep PI.NDST up to date for simplicity: it makes the 1266 * code easier, and CPU migration is not a fast path. 1267 */ 1268 if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu) 1269 return; 1270 1271 /* 1272 * If the 'nv' field is POSTED_INTR_WAKEUP_VECTOR, do not change 1273 * PI.NDST: pi_post_block is the one expected to change PID.NDST and the 1274 * wakeup handler expects the vCPU to be on the blocked_vcpu_list that 1275 * matches PI.NDST. Otherwise, a vcpu may not be able to be woken up 1276 * correctly. 1277 */ 1278 if (pi_desc->nv == POSTED_INTR_WAKEUP_VECTOR || vcpu->cpu == cpu) { 1279 pi_clear_sn(pi_desc); 1280 goto after_clear_sn; 1281 } 1282 1283 /* The full case. */ 1284 do { 1285 old.control = new.control = pi_desc->control; 1286 1287 dest = cpu_physical_id(cpu); 1288 1289 if (x2apic_enabled()) 1290 new.ndst = dest; 1291 else 1292 new.ndst = (dest << 8) & 0xFF00; 1293 1294 new.sn = 0; 1295 } while (cmpxchg64(&pi_desc->control, old.control, 1296 new.control) != old.control); 1297 1298 after_clear_sn: 1299 1300 /* 1301 * Clear SN before reading the bitmap. The VT-d firmware 1302 * writes the bitmap and reads SN atomically (5.2.3 in the 1303 * spec), so it doesn't really have a memory barrier that 1304 * pairs with this, but we cannot do that and we need one. 1305 */ 1306 smp_mb__after_atomic(); 1307 1308 if (!pi_is_pir_empty(pi_desc)) 1309 pi_set_on(pi_desc); 1310 } 1311 1312 void vmx_vcpu_load_vmcs(struct kvm_vcpu *vcpu, int cpu, 1313 struct loaded_vmcs *buddy) 1314 { 1315 struct vcpu_vmx *vmx = to_vmx(vcpu); 1316 bool already_loaded = vmx->loaded_vmcs->cpu == cpu; 1317 struct vmcs *prev; 1318 1319 if (!already_loaded) { 1320 loaded_vmcs_clear(vmx->loaded_vmcs); 1321 local_irq_disable(); 1322 1323 /* 1324 * Ensure loaded_vmcs->cpu is read before adding loaded_vmcs to 1325 * this cpu's percpu list, otherwise it may not yet be deleted 1326 * from its previous cpu's percpu list. Pairs with the 1327 * smb_wmb() in __loaded_vmcs_clear(). 1328 */ 1329 smp_rmb(); 1330 1331 list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link, 1332 &per_cpu(loaded_vmcss_on_cpu, cpu)); 1333 local_irq_enable(); 1334 } 1335 1336 prev = per_cpu(current_vmcs, cpu); 1337 if (prev != vmx->loaded_vmcs->vmcs) { 1338 per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs; 1339 vmcs_load(vmx->loaded_vmcs->vmcs); 1340 1341 /* 1342 * No indirect branch prediction barrier needed when switching 1343 * the active VMCS within a guest, e.g. on nested VM-Enter. 1344 * The L1 VMM can protect itself with retpolines, IBPB or IBRS. 1345 */ 1346 if (!buddy || WARN_ON_ONCE(buddy->vmcs != prev)) 1347 indirect_branch_prediction_barrier(); 1348 } 1349 1350 if (!already_loaded) { 1351 void *gdt = get_current_gdt_ro(); 1352 unsigned long sysenter_esp; 1353 1354 /* 1355 * Flush all EPTP/VPID contexts, the new pCPU may have stale 1356 * TLB entries from its previous association with the vCPU. 1357 */ 1358 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 1359 1360 /* 1361 * Linux uses per-cpu TSS and GDT, so set these when switching 1362 * processors. See 22.2.4. 1363 */ 1364 vmcs_writel(HOST_TR_BASE, 1365 (unsigned long)&get_cpu_entry_area(cpu)->tss.x86_tss); 1366 vmcs_writel(HOST_GDTR_BASE, (unsigned long)gdt); /* 22.2.4 */ 1367 1368 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); 1369 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ 1370 1371 vmx->loaded_vmcs->cpu = cpu; 1372 } 1373 1374 /* Setup TSC multiplier */ 1375 if (kvm_has_tsc_control && 1376 vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio) 1377 decache_tsc_multiplier(vmx); 1378 } 1379 1380 /* 1381 * Switches to specified vcpu, until a matching vcpu_put(), but assumes 1382 * vcpu mutex is already taken. 1383 */ 1384 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 1385 { 1386 struct vcpu_vmx *vmx = to_vmx(vcpu); 1387 1388 vmx_vcpu_load_vmcs(vcpu, cpu, NULL); 1389 1390 vmx_vcpu_pi_load(vcpu, cpu); 1391 1392 vmx->host_debugctlmsr = get_debugctlmsr(); 1393 } 1394 1395 static void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu) 1396 { 1397 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 1398 1399 if (!kvm_arch_has_assigned_device(vcpu->kvm) || 1400 !irq_remapping_cap(IRQ_POSTING_CAP) || 1401 !kvm_vcpu_apicv_active(vcpu)) 1402 return; 1403 1404 /* Set SN when the vCPU is preempted */ 1405 if (vcpu->preempted) 1406 pi_set_sn(pi_desc); 1407 } 1408 1409 static void vmx_vcpu_put(struct kvm_vcpu *vcpu) 1410 { 1411 vmx_vcpu_pi_put(vcpu); 1412 1413 vmx_prepare_switch_to_host(to_vmx(vcpu)); 1414 } 1415 1416 static bool emulation_required(struct kvm_vcpu *vcpu) 1417 { 1418 return emulate_invalid_guest_state && !guest_state_valid(vcpu); 1419 } 1420 1421 unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) 1422 { 1423 struct vcpu_vmx *vmx = to_vmx(vcpu); 1424 unsigned long rflags, save_rflags; 1425 1426 if (!kvm_register_is_available(vcpu, VCPU_EXREG_RFLAGS)) { 1427 kvm_register_mark_available(vcpu, VCPU_EXREG_RFLAGS); 1428 rflags = vmcs_readl(GUEST_RFLAGS); 1429 if (vmx->rmode.vm86_active) { 1430 rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS; 1431 save_rflags = vmx->rmode.save_rflags; 1432 rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; 1433 } 1434 vmx->rflags = rflags; 1435 } 1436 return vmx->rflags; 1437 } 1438 1439 void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) 1440 { 1441 struct vcpu_vmx *vmx = to_vmx(vcpu); 1442 unsigned long old_rflags; 1443 1444 if (enable_unrestricted_guest) { 1445 kvm_register_mark_available(vcpu, VCPU_EXREG_RFLAGS); 1446 vmx->rflags = rflags; 1447 vmcs_writel(GUEST_RFLAGS, rflags); 1448 return; 1449 } 1450 1451 old_rflags = vmx_get_rflags(vcpu); 1452 vmx->rflags = rflags; 1453 if (vmx->rmode.vm86_active) { 1454 vmx->rmode.save_rflags = rflags; 1455 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; 1456 } 1457 vmcs_writel(GUEST_RFLAGS, rflags); 1458 1459 if ((old_rflags ^ vmx->rflags) & X86_EFLAGS_VM) 1460 vmx->emulation_required = emulation_required(vcpu); 1461 } 1462 1463 u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu) 1464 { 1465 u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); 1466 int ret = 0; 1467 1468 if (interruptibility & GUEST_INTR_STATE_STI) 1469 ret |= KVM_X86_SHADOW_INT_STI; 1470 if (interruptibility & GUEST_INTR_STATE_MOV_SS) 1471 ret |= KVM_X86_SHADOW_INT_MOV_SS; 1472 1473 return ret; 1474 } 1475 1476 void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) 1477 { 1478 u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); 1479 u32 interruptibility = interruptibility_old; 1480 1481 interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); 1482 1483 if (mask & KVM_X86_SHADOW_INT_MOV_SS) 1484 interruptibility |= GUEST_INTR_STATE_MOV_SS; 1485 else if (mask & KVM_X86_SHADOW_INT_STI) 1486 interruptibility |= GUEST_INTR_STATE_STI; 1487 1488 if ((interruptibility != interruptibility_old)) 1489 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); 1490 } 1491 1492 static int vmx_rtit_ctl_check(struct kvm_vcpu *vcpu, u64 data) 1493 { 1494 struct vcpu_vmx *vmx = to_vmx(vcpu); 1495 unsigned long value; 1496 1497 /* 1498 * Any MSR write that attempts to change bits marked reserved will 1499 * case a #GP fault. 1500 */ 1501 if (data & vmx->pt_desc.ctl_bitmask) 1502 return 1; 1503 1504 /* 1505 * Any attempt to modify IA32_RTIT_CTL while TraceEn is set will 1506 * result in a #GP unless the same write also clears TraceEn. 1507 */ 1508 if ((vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) && 1509 ((vmx->pt_desc.guest.ctl ^ data) & ~RTIT_CTL_TRACEEN)) 1510 return 1; 1511 1512 /* 1513 * WRMSR to IA32_RTIT_CTL that sets TraceEn but clears this bit 1514 * and FabricEn would cause #GP, if 1515 * CPUID.(EAX=14H, ECX=0):ECX.SNGLRGNOUT[bit 2] = 0 1516 */ 1517 if ((data & RTIT_CTL_TRACEEN) && !(data & RTIT_CTL_TOPA) && 1518 !(data & RTIT_CTL_FABRIC_EN) && 1519 !intel_pt_validate_cap(vmx->pt_desc.caps, 1520 PT_CAP_single_range_output)) 1521 return 1; 1522 1523 /* 1524 * MTCFreq, CycThresh and PSBFreq encodings check, any MSR write that 1525 * utilize encodings marked reserved will casue a #GP fault. 1526 */ 1527 value = intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_mtc_periods); 1528 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_mtc) && 1529 !test_bit((data & RTIT_CTL_MTC_RANGE) >> 1530 RTIT_CTL_MTC_RANGE_OFFSET, &value)) 1531 return 1; 1532 value = intel_pt_validate_cap(vmx->pt_desc.caps, 1533 PT_CAP_cycle_thresholds); 1534 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_psb_cyc) && 1535 !test_bit((data & RTIT_CTL_CYC_THRESH) >> 1536 RTIT_CTL_CYC_THRESH_OFFSET, &value)) 1537 return 1; 1538 value = intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_psb_periods); 1539 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_psb_cyc) && 1540 !test_bit((data & RTIT_CTL_PSB_FREQ) >> 1541 RTIT_CTL_PSB_FREQ_OFFSET, &value)) 1542 return 1; 1543 1544 /* 1545 * If ADDRx_CFG is reserved or the encodings is >2 will 1546 * cause a #GP fault. 1547 */ 1548 value = (data & RTIT_CTL_ADDR0) >> RTIT_CTL_ADDR0_OFFSET; 1549 if ((value && (vmx->pt_desc.addr_range < 1)) || (value > 2)) 1550 return 1; 1551 value = (data & RTIT_CTL_ADDR1) >> RTIT_CTL_ADDR1_OFFSET; 1552 if ((value && (vmx->pt_desc.addr_range < 2)) || (value > 2)) 1553 return 1; 1554 value = (data & RTIT_CTL_ADDR2) >> RTIT_CTL_ADDR2_OFFSET; 1555 if ((value && (vmx->pt_desc.addr_range < 3)) || (value > 2)) 1556 return 1; 1557 value = (data & RTIT_CTL_ADDR3) >> RTIT_CTL_ADDR3_OFFSET; 1558 if ((value && (vmx->pt_desc.addr_range < 4)) || (value > 2)) 1559 return 1; 1560 1561 return 0; 1562 } 1563 1564 static int skip_emulated_instruction(struct kvm_vcpu *vcpu) 1565 { 1566 unsigned long rip, orig_rip; 1567 1568 /* 1569 * Using VMCS.VM_EXIT_INSTRUCTION_LEN on EPT misconfig depends on 1570 * undefined behavior: Intel's SDM doesn't mandate the VMCS field be 1571 * set when EPT misconfig occurs. In practice, real hardware updates 1572 * VM_EXIT_INSTRUCTION_LEN on EPT misconfig, but other hypervisors 1573 * (namely Hyper-V) don't set it due to it being undefined behavior, 1574 * i.e. we end up advancing IP with some random value. 1575 */ 1576 if (!static_cpu_has(X86_FEATURE_HYPERVISOR) || 1577 to_vmx(vcpu)->exit_reason != EXIT_REASON_EPT_MISCONFIG) { 1578 orig_rip = kvm_rip_read(vcpu); 1579 rip = orig_rip + vmcs_read32(VM_EXIT_INSTRUCTION_LEN); 1580 #ifdef CONFIG_X86_64 1581 /* 1582 * We need to mask out the high 32 bits of RIP if not in 64-bit 1583 * mode, but just finding out that we are in 64-bit mode is 1584 * quite expensive. Only do it if there was a carry. 1585 */ 1586 if (unlikely(((rip ^ orig_rip) >> 31) == 3) && !is_64_bit_mode(vcpu)) 1587 rip = (u32)rip; 1588 #endif 1589 kvm_rip_write(vcpu, rip); 1590 } else { 1591 if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP)) 1592 return 0; 1593 } 1594 1595 /* skipping an emulated instruction also counts */ 1596 vmx_set_interrupt_shadow(vcpu, 0); 1597 1598 return 1; 1599 } 1600 1601 /* 1602 * Handles kvm_read/write_guest_virt*() result and either injects #PF or returns 1603 * KVM_EXIT_INTERNAL_ERROR for cases not currently handled by KVM. Return value 1604 * indicates whether exit to userspace is needed. 1605 */ 1606 int vmx_handle_memory_failure(struct kvm_vcpu *vcpu, int r, 1607 struct x86_exception *e) 1608 { 1609 if (r == X86EMUL_PROPAGATE_FAULT) { 1610 kvm_inject_emulated_page_fault(vcpu, e); 1611 return 1; 1612 } 1613 1614 /* 1615 * In case kvm_read/write_guest_virt*() failed with X86EMUL_IO_NEEDED 1616 * while handling a VMX instruction KVM could've handled the request 1617 * correctly by exiting to userspace and performing I/O but there 1618 * doesn't seem to be a real use-case behind such requests, just return 1619 * KVM_EXIT_INTERNAL_ERROR for now. 1620 */ 1621 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1622 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; 1623 vcpu->run->internal.ndata = 0; 1624 1625 return 0; 1626 } 1627 1628 /* 1629 * Recognizes a pending MTF VM-exit and records the nested state for later 1630 * delivery. 1631 */ 1632 static void vmx_update_emulated_instruction(struct kvm_vcpu *vcpu) 1633 { 1634 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 1635 struct vcpu_vmx *vmx = to_vmx(vcpu); 1636 1637 if (!is_guest_mode(vcpu)) 1638 return; 1639 1640 /* 1641 * Per the SDM, MTF takes priority over debug-trap exceptions besides 1642 * T-bit traps. As instruction emulation is completed (i.e. at the 1643 * instruction boundary), any #DB exception pending delivery must be a 1644 * debug-trap. Record the pending MTF state to be delivered in 1645 * vmx_check_nested_events(). 1646 */ 1647 if (nested_cpu_has_mtf(vmcs12) && 1648 (!vcpu->arch.exception.pending || 1649 vcpu->arch.exception.nr == DB_VECTOR)) 1650 vmx->nested.mtf_pending = true; 1651 else 1652 vmx->nested.mtf_pending = false; 1653 } 1654 1655 static int vmx_skip_emulated_instruction(struct kvm_vcpu *vcpu) 1656 { 1657 vmx_update_emulated_instruction(vcpu); 1658 return skip_emulated_instruction(vcpu); 1659 } 1660 1661 static void vmx_clear_hlt(struct kvm_vcpu *vcpu) 1662 { 1663 /* 1664 * Ensure that we clear the HLT state in the VMCS. We don't need to 1665 * explicitly skip the instruction because if the HLT state is set, 1666 * then the instruction is already executing and RIP has already been 1667 * advanced. 1668 */ 1669 if (kvm_hlt_in_guest(vcpu->kvm) && 1670 vmcs_read32(GUEST_ACTIVITY_STATE) == GUEST_ACTIVITY_HLT) 1671 vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); 1672 } 1673 1674 static void vmx_queue_exception(struct kvm_vcpu *vcpu) 1675 { 1676 struct vcpu_vmx *vmx = to_vmx(vcpu); 1677 unsigned nr = vcpu->arch.exception.nr; 1678 bool has_error_code = vcpu->arch.exception.has_error_code; 1679 u32 error_code = vcpu->arch.exception.error_code; 1680 u32 intr_info = nr | INTR_INFO_VALID_MASK; 1681 1682 kvm_deliver_exception_payload(vcpu); 1683 1684 if (has_error_code) { 1685 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); 1686 intr_info |= INTR_INFO_DELIVER_CODE_MASK; 1687 } 1688 1689 if (vmx->rmode.vm86_active) { 1690 int inc_eip = 0; 1691 if (kvm_exception_is_soft(nr)) 1692 inc_eip = vcpu->arch.event_exit_inst_len; 1693 kvm_inject_realmode_interrupt(vcpu, nr, inc_eip); 1694 return; 1695 } 1696 1697 WARN_ON_ONCE(vmx->emulation_required); 1698 1699 if (kvm_exception_is_soft(nr)) { 1700 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1701 vmx->vcpu.arch.event_exit_inst_len); 1702 intr_info |= INTR_TYPE_SOFT_EXCEPTION; 1703 } else 1704 intr_info |= INTR_TYPE_HARD_EXCEPTION; 1705 1706 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); 1707 1708 vmx_clear_hlt(vcpu); 1709 } 1710 1711 /* 1712 * Swap MSR entry in host/guest MSR entry array. 1713 */ 1714 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) 1715 { 1716 struct shared_msr_entry tmp; 1717 1718 tmp = vmx->guest_msrs[to]; 1719 vmx->guest_msrs[to] = vmx->guest_msrs[from]; 1720 vmx->guest_msrs[from] = tmp; 1721 } 1722 1723 /* 1724 * Set up the vmcs to automatically save and restore system 1725 * msrs. Don't touch the 64-bit msrs if the guest is in legacy 1726 * mode, as fiddling with msrs is very expensive. 1727 */ 1728 static void setup_msrs(struct vcpu_vmx *vmx) 1729 { 1730 int save_nmsrs, index; 1731 1732 save_nmsrs = 0; 1733 #ifdef CONFIG_X86_64 1734 /* 1735 * The SYSCALL MSRs are only needed on long mode guests, and only 1736 * when EFER.SCE is set. 1737 */ 1738 if (is_long_mode(&vmx->vcpu) && (vmx->vcpu.arch.efer & EFER_SCE)) { 1739 index = __find_msr_index(vmx, MSR_STAR); 1740 if (index >= 0) 1741 move_msr_up(vmx, index, save_nmsrs++); 1742 index = __find_msr_index(vmx, MSR_LSTAR); 1743 if (index >= 0) 1744 move_msr_up(vmx, index, save_nmsrs++); 1745 index = __find_msr_index(vmx, MSR_SYSCALL_MASK); 1746 if (index >= 0) 1747 move_msr_up(vmx, index, save_nmsrs++); 1748 } 1749 #endif 1750 index = __find_msr_index(vmx, MSR_EFER); 1751 if (index >= 0 && update_transition_efer(vmx, index)) 1752 move_msr_up(vmx, index, save_nmsrs++); 1753 index = __find_msr_index(vmx, MSR_TSC_AUX); 1754 if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP)) 1755 move_msr_up(vmx, index, save_nmsrs++); 1756 index = __find_msr_index(vmx, MSR_IA32_TSX_CTRL); 1757 if (index >= 0) 1758 move_msr_up(vmx, index, save_nmsrs++); 1759 1760 vmx->save_nmsrs = save_nmsrs; 1761 vmx->guest_msrs_ready = false; 1762 1763 if (cpu_has_vmx_msr_bitmap()) 1764 vmx_update_msr_bitmap(&vmx->vcpu); 1765 } 1766 1767 static u64 vmx_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) 1768 { 1769 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 1770 u64 g_tsc_offset = 0; 1771 1772 /* 1773 * We're here if L1 chose not to trap WRMSR to TSC. According 1774 * to the spec, this should set L1's TSC; The offset that L1 1775 * set for L2 remains unchanged, and still needs to be added 1776 * to the newly set TSC to get L2's TSC. 1777 */ 1778 if (is_guest_mode(vcpu) && 1779 (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETTING)) 1780 g_tsc_offset = vmcs12->tsc_offset; 1781 1782 trace_kvm_write_tsc_offset(vcpu->vcpu_id, 1783 vcpu->arch.tsc_offset - g_tsc_offset, 1784 offset); 1785 vmcs_write64(TSC_OFFSET, offset + g_tsc_offset); 1786 return offset + g_tsc_offset; 1787 } 1788 1789 /* 1790 * nested_vmx_allowed() checks whether a guest should be allowed to use VMX 1791 * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for 1792 * all guests if the "nested" module option is off, and can also be disabled 1793 * for a single guest by disabling its VMX cpuid bit. 1794 */ 1795 bool nested_vmx_allowed(struct kvm_vcpu *vcpu) 1796 { 1797 return nested && guest_cpuid_has(vcpu, X86_FEATURE_VMX); 1798 } 1799 1800 static inline bool vmx_feature_control_msr_valid(struct kvm_vcpu *vcpu, 1801 uint64_t val) 1802 { 1803 uint64_t valid_bits = to_vmx(vcpu)->msr_ia32_feature_control_valid_bits; 1804 1805 return !(val & ~valid_bits); 1806 } 1807 1808 static int vmx_get_msr_feature(struct kvm_msr_entry *msr) 1809 { 1810 switch (msr->index) { 1811 case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: 1812 if (!nested) 1813 return 1; 1814 return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data); 1815 case MSR_IA32_PERF_CAPABILITIES: 1816 msr->data = vmx_get_perf_capabilities(); 1817 return 0; 1818 default: 1819 return KVM_MSR_RET_INVALID; 1820 } 1821 } 1822 1823 /* 1824 * Reads an msr value (of 'msr_index') into 'pdata'. 1825 * Returns 0 on success, non-0 otherwise. 1826 * Assumes vcpu_load() was already called. 1827 */ 1828 static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 1829 { 1830 struct vcpu_vmx *vmx = to_vmx(vcpu); 1831 struct shared_msr_entry *msr; 1832 u32 index; 1833 1834 switch (msr_info->index) { 1835 #ifdef CONFIG_X86_64 1836 case MSR_FS_BASE: 1837 msr_info->data = vmcs_readl(GUEST_FS_BASE); 1838 break; 1839 case MSR_GS_BASE: 1840 msr_info->data = vmcs_readl(GUEST_GS_BASE); 1841 break; 1842 case MSR_KERNEL_GS_BASE: 1843 msr_info->data = vmx_read_guest_kernel_gs_base(vmx); 1844 break; 1845 #endif 1846 case MSR_EFER: 1847 return kvm_get_msr_common(vcpu, msr_info); 1848 case MSR_IA32_TSX_CTRL: 1849 if (!msr_info->host_initiated && 1850 !(vcpu->arch.arch_capabilities & ARCH_CAP_TSX_CTRL_MSR)) 1851 return 1; 1852 goto find_shared_msr; 1853 case MSR_IA32_UMWAIT_CONTROL: 1854 if (!msr_info->host_initiated && !vmx_has_waitpkg(vmx)) 1855 return 1; 1856 1857 msr_info->data = vmx->msr_ia32_umwait_control; 1858 break; 1859 case MSR_IA32_SPEC_CTRL: 1860 if (!msr_info->host_initiated && 1861 !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) 1862 return 1; 1863 1864 msr_info->data = to_vmx(vcpu)->spec_ctrl; 1865 break; 1866 case MSR_IA32_SYSENTER_CS: 1867 msr_info->data = vmcs_read32(GUEST_SYSENTER_CS); 1868 break; 1869 case MSR_IA32_SYSENTER_EIP: 1870 msr_info->data = vmcs_readl(GUEST_SYSENTER_EIP); 1871 break; 1872 case MSR_IA32_SYSENTER_ESP: 1873 msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP); 1874 break; 1875 case MSR_IA32_BNDCFGS: 1876 if (!kvm_mpx_supported() || 1877 (!msr_info->host_initiated && 1878 !guest_cpuid_has(vcpu, X86_FEATURE_MPX))) 1879 return 1; 1880 msr_info->data = vmcs_read64(GUEST_BNDCFGS); 1881 break; 1882 case MSR_IA32_MCG_EXT_CTL: 1883 if (!msr_info->host_initiated && 1884 !(vmx->msr_ia32_feature_control & 1885 FEAT_CTL_LMCE_ENABLED)) 1886 return 1; 1887 msr_info->data = vcpu->arch.mcg_ext_ctl; 1888 break; 1889 case MSR_IA32_FEAT_CTL: 1890 msr_info->data = vmx->msr_ia32_feature_control; 1891 break; 1892 case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: 1893 if (!nested_vmx_allowed(vcpu)) 1894 return 1; 1895 if (vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index, 1896 &msr_info->data)) 1897 return 1; 1898 /* 1899 * Enlightened VMCS v1 doesn't have certain fields, but buggy 1900 * Hyper-V versions are still trying to use corresponding 1901 * features when they are exposed. Filter out the essential 1902 * minimum. 1903 */ 1904 if (!msr_info->host_initiated && 1905 vmx->nested.enlightened_vmcs_enabled) 1906 nested_evmcs_filter_control_msr(msr_info->index, 1907 &msr_info->data); 1908 break; 1909 case MSR_IA32_RTIT_CTL: 1910 if (!vmx_pt_mode_is_host_guest()) 1911 return 1; 1912 msr_info->data = vmx->pt_desc.guest.ctl; 1913 break; 1914 case MSR_IA32_RTIT_STATUS: 1915 if (!vmx_pt_mode_is_host_guest()) 1916 return 1; 1917 msr_info->data = vmx->pt_desc.guest.status; 1918 break; 1919 case MSR_IA32_RTIT_CR3_MATCH: 1920 if (!vmx_pt_mode_is_host_guest() || 1921 !intel_pt_validate_cap(vmx->pt_desc.caps, 1922 PT_CAP_cr3_filtering)) 1923 return 1; 1924 msr_info->data = vmx->pt_desc.guest.cr3_match; 1925 break; 1926 case MSR_IA32_RTIT_OUTPUT_BASE: 1927 if (!vmx_pt_mode_is_host_guest() || 1928 (!intel_pt_validate_cap(vmx->pt_desc.caps, 1929 PT_CAP_topa_output) && 1930 !intel_pt_validate_cap(vmx->pt_desc.caps, 1931 PT_CAP_single_range_output))) 1932 return 1; 1933 msr_info->data = vmx->pt_desc.guest.output_base; 1934 break; 1935 case MSR_IA32_RTIT_OUTPUT_MASK: 1936 if (!vmx_pt_mode_is_host_guest() || 1937 (!intel_pt_validate_cap(vmx->pt_desc.caps, 1938 PT_CAP_topa_output) && 1939 !intel_pt_validate_cap(vmx->pt_desc.caps, 1940 PT_CAP_single_range_output))) 1941 return 1; 1942 msr_info->data = vmx->pt_desc.guest.output_mask; 1943 break; 1944 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: 1945 index = msr_info->index - MSR_IA32_RTIT_ADDR0_A; 1946 if (!vmx_pt_mode_is_host_guest() || 1947 (index >= 2 * intel_pt_validate_cap(vmx->pt_desc.caps, 1948 PT_CAP_num_address_ranges))) 1949 return 1; 1950 if (index % 2) 1951 msr_info->data = vmx->pt_desc.guest.addr_b[index / 2]; 1952 else 1953 msr_info->data = vmx->pt_desc.guest.addr_a[index / 2]; 1954 break; 1955 case MSR_TSC_AUX: 1956 if (!msr_info->host_initiated && 1957 !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) 1958 return 1; 1959 goto find_shared_msr; 1960 default: 1961 find_shared_msr: 1962 msr = find_msr_entry(vmx, msr_info->index); 1963 if (msr) { 1964 msr_info->data = msr->data; 1965 break; 1966 } 1967 return kvm_get_msr_common(vcpu, msr_info); 1968 } 1969 1970 return 0; 1971 } 1972 1973 static u64 nested_vmx_truncate_sysenter_addr(struct kvm_vcpu *vcpu, 1974 u64 data) 1975 { 1976 #ifdef CONFIG_X86_64 1977 if (!guest_cpuid_has(vcpu, X86_FEATURE_LM)) 1978 return (u32)data; 1979 #endif 1980 return (unsigned long)data; 1981 } 1982 1983 /* 1984 * Writes msr value into the appropriate "register". 1985 * Returns 0 on success, non-0 otherwise. 1986 * Assumes vcpu_load() was already called. 1987 */ 1988 static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 1989 { 1990 struct vcpu_vmx *vmx = to_vmx(vcpu); 1991 struct shared_msr_entry *msr; 1992 int ret = 0; 1993 u32 msr_index = msr_info->index; 1994 u64 data = msr_info->data; 1995 u32 index; 1996 1997 switch (msr_index) { 1998 case MSR_EFER: 1999 ret = kvm_set_msr_common(vcpu, msr_info); 2000 break; 2001 #ifdef CONFIG_X86_64 2002 case MSR_FS_BASE: 2003 vmx_segment_cache_clear(vmx); 2004 vmcs_writel(GUEST_FS_BASE, data); 2005 break; 2006 case MSR_GS_BASE: 2007 vmx_segment_cache_clear(vmx); 2008 vmcs_writel(GUEST_GS_BASE, data); 2009 break; 2010 case MSR_KERNEL_GS_BASE: 2011 vmx_write_guest_kernel_gs_base(vmx, data); 2012 break; 2013 #endif 2014 case MSR_IA32_SYSENTER_CS: 2015 if (is_guest_mode(vcpu)) 2016 get_vmcs12(vcpu)->guest_sysenter_cs = data; 2017 vmcs_write32(GUEST_SYSENTER_CS, data); 2018 break; 2019 case MSR_IA32_SYSENTER_EIP: 2020 if (is_guest_mode(vcpu)) { 2021 data = nested_vmx_truncate_sysenter_addr(vcpu, data); 2022 get_vmcs12(vcpu)->guest_sysenter_eip = data; 2023 } 2024 vmcs_writel(GUEST_SYSENTER_EIP, data); 2025 break; 2026 case MSR_IA32_SYSENTER_ESP: 2027 if (is_guest_mode(vcpu)) { 2028 data = nested_vmx_truncate_sysenter_addr(vcpu, data); 2029 get_vmcs12(vcpu)->guest_sysenter_esp = data; 2030 } 2031 vmcs_writel(GUEST_SYSENTER_ESP, data); 2032 break; 2033 case MSR_IA32_DEBUGCTLMSR: 2034 if (is_guest_mode(vcpu) && get_vmcs12(vcpu)->vm_exit_controls & 2035 VM_EXIT_SAVE_DEBUG_CONTROLS) 2036 get_vmcs12(vcpu)->guest_ia32_debugctl = data; 2037 2038 ret = kvm_set_msr_common(vcpu, msr_info); 2039 break; 2040 2041 case MSR_IA32_BNDCFGS: 2042 if (!kvm_mpx_supported() || 2043 (!msr_info->host_initiated && 2044 !guest_cpuid_has(vcpu, X86_FEATURE_MPX))) 2045 return 1; 2046 if (is_noncanonical_address(data & PAGE_MASK, vcpu) || 2047 (data & MSR_IA32_BNDCFGS_RSVD)) 2048 return 1; 2049 vmcs_write64(GUEST_BNDCFGS, data); 2050 break; 2051 case MSR_IA32_UMWAIT_CONTROL: 2052 if (!msr_info->host_initiated && !vmx_has_waitpkg(vmx)) 2053 return 1; 2054 2055 /* The reserved bit 1 and non-32 bit [63:32] should be zero */ 2056 if (data & (BIT_ULL(1) | GENMASK_ULL(63, 32))) 2057 return 1; 2058 2059 vmx->msr_ia32_umwait_control = data; 2060 break; 2061 case MSR_IA32_SPEC_CTRL: 2062 if (!msr_info->host_initiated && 2063 !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) 2064 return 1; 2065 2066 if (kvm_spec_ctrl_test_value(data)) 2067 return 1; 2068 2069 vmx->spec_ctrl = data; 2070 if (!data) 2071 break; 2072 2073 /* 2074 * For non-nested: 2075 * When it's written (to non-zero) for the first time, pass 2076 * it through. 2077 * 2078 * For nested: 2079 * The handling of the MSR bitmap for L2 guests is done in 2080 * nested_vmx_prepare_msr_bitmap. We should not touch the 2081 * vmcs02.msr_bitmap here since it gets completely overwritten 2082 * in the merging. We update the vmcs01 here for L1 as well 2083 * since it will end up touching the MSR anyway now. 2084 */ 2085 vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap, 2086 MSR_IA32_SPEC_CTRL, 2087 MSR_TYPE_RW); 2088 break; 2089 case MSR_IA32_TSX_CTRL: 2090 if (!msr_info->host_initiated && 2091 !(vcpu->arch.arch_capabilities & ARCH_CAP_TSX_CTRL_MSR)) 2092 return 1; 2093 if (data & ~(TSX_CTRL_RTM_DISABLE | TSX_CTRL_CPUID_CLEAR)) 2094 return 1; 2095 goto find_shared_msr; 2096 case MSR_IA32_PRED_CMD: 2097 if (!msr_info->host_initiated && 2098 !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) 2099 return 1; 2100 2101 if (data & ~PRED_CMD_IBPB) 2102 return 1; 2103 if (!boot_cpu_has(X86_FEATURE_SPEC_CTRL)) 2104 return 1; 2105 if (!data) 2106 break; 2107 2108 wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB); 2109 2110 /* 2111 * For non-nested: 2112 * When it's written (to non-zero) for the first time, pass 2113 * it through. 2114 * 2115 * For nested: 2116 * The handling of the MSR bitmap for L2 guests is done in 2117 * nested_vmx_prepare_msr_bitmap. We should not touch the 2118 * vmcs02.msr_bitmap here since it gets completely overwritten 2119 * in the merging. 2120 */ 2121 vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap, MSR_IA32_PRED_CMD, 2122 MSR_TYPE_W); 2123 break; 2124 case MSR_IA32_CR_PAT: 2125 if (!kvm_pat_valid(data)) 2126 return 1; 2127 2128 if (is_guest_mode(vcpu) && 2129 get_vmcs12(vcpu)->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT) 2130 get_vmcs12(vcpu)->guest_ia32_pat = data; 2131 2132 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { 2133 vmcs_write64(GUEST_IA32_PAT, data); 2134 vcpu->arch.pat = data; 2135 break; 2136 } 2137 ret = kvm_set_msr_common(vcpu, msr_info); 2138 break; 2139 case MSR_IA32_TSC_ADJUST: 2140 ret = kvm_set_msr_common(vcpu, msr_info); 2141 break; 2142 case MSR_IA32_MCG_EXT_CTL: 2143 if ((!msr_info->host_initiated && 2144 !(to_vmx(vcpu)->msr_ia32_feature_control & 2145 FEAT_CTL_LMCE_ENABLED)) || 2146 (data & ~MCG_EXT_CTL_LMCE_EN)) 2147 return 1; 2148 vcpu->arch.mcg_ext_ctl = data; 2149 break; 2150 case MSR_IA32_FEAT_CTL: 2151 if (!vmx_feature_control_msr_valid(vcpu, data) || 2152 (to_vmx(vcpu)->msr_ia32_feature_control & 2153 FEAT_CTL_LOCKED && !msr_info->host_initiated)) 2154 return 1; 2155 vmx->msr_ia32_feature_control = data; 2156 if (msr_info->host_initiated && data == 0) 2157 vmx_leave_nested(vcpu); 2158 break; 2159 case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: 2160 if (!msr_info->host_initiated) 2161 return 1; /* they are read-only */ 2162 if (!nested_vmx_allowed(vcpu)) 2163 return 1; 2164 return vmx_set_vmx_msr(vcpu, msr_index, data); 2165 case MSR_IA32_RTIT_CTL: 2166 if (!vmx_pt_mode_is_host_guest() || 2167 vmx_rtit_ctl_check(vcpu, data) || 2168 vmx->nested.vmxon) 2169 return 1; 2170 vmcs_write64(GUEST_IA32_RTIT_CTL, data); 2171 vmx->pt_desc.guest.ctl = data; 2172 pt_update_intercept_for_msr(vmx); 2173 break; 2174 case MSR_IA32_RTIT_STATUS: 2175 if (!pt_can_write_msr(vmx)) 2176 return 1; 2177 if (data & MSR_IA32_RTIT_STATUS_MASK) 2178 return 1; 2179 vmx->pt_desc.guest.status = data; 2180 break; 2181 case MSR_IA32_RTIT_CR3_MATCH: 2182 if (!pt_can_write_msr(vmx)) 2183 return 1; 2184 if (!intel_pt_validate_cap(vmx->pt_desc.caps, 2185 PT_CAP_cr3_filtering)) 2186 return 1; 2187 vmx->pt_desc.guest.cr3_match = data; 2188 break; 2189 case MSR_IA32_RTIT_OUTPUT_BASE: 2190 if (!pt_can_write_msr(vmx)) 2191 return 1; 2192 if (!intel_pt_validate_cap(vmx->pt_desc.caps, 2193 PT_CAP_topa_output) && 2194 !intel_pt_validate_cap(vmx->pt_desc.caps, 2195 PT_CAP_single_range_output)) 2196 return 1; 2197 if (data & MSR_IA32_RTIT_OUTPUT_BASE_MASK) 2198 return 1; 2199 vmx->pt_desc.guest.output_base = data; 2200 break; 2201 case MSR_IA32_RTIT_OUTPUT_MASK: 2202 if (!pt_can_write_msr(vmx)) 2203 return 1; 2204 if (!intel_pt_validate_cap(vmx->pt_desc.caps, 2205 PT_CAP_topa_output) && 2206 !intel_pt_validate_cap(vmx->pt_desc.caps, 2207 PT_CAP_single_range_output)) 2208 return 1; 2209 vmx->pt_desc.guest.output_mask = data; 2210 break; 2211 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: 2212 if (!pt_can_write_msr(vmx)) 2213 return 1; 2214 index = msr_info->index - MSR_IA32_RTIT_ADDR0_A; 2215 if (index >= 2 * intel_pt_validate_cap(vmx->pt_desc.caps, 2216 PT_CAP_num_address_ranges)) 2217 return 1; 2218 if (is_noncanonical_address(data, vcpu)) 2219 return 1; 2220 if (index % 2) 2221 vmx->pt_desc.guest.addr_b[index / 2] = data; 2222 else 2223 vmx->pt_desc.guest.addr_a[index / 2] = data; 2224 break; 2225 case MSR_TSC_AUX: 2226 if (!msr_info->host_initiated && 2227 !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) 2228 return 1; 2229 /* Check reserved bit, higher 32 bits should be zero */ 2230 if ((data >> 32) != 0) 2231 return 1; 2232 goto find_shared_msr; 2233 2234 default: 2235 find_shared_msr: 2236 msr = find_msr_entry(vmx, msr_index); 2237 if (msr) 2238 ret = vmx_set_guest_msr(vmx, msr, data); 2239 else 2240 ret = kvm_set_msr_common(vcpu, msr_info); 2241 } 2242 2243 return ret; 2244 } 2245 2246 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) 2247 { 2248 unsigned long guest_owned_bits; 2249 2250 kvm_register_mark_available(vcpu, reg); 2251 2252 switch (reg) { 2253 case VCPU_REGS_RSP: 2254 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); 2255 break; 2256 case VCPU_REGS_RIP: 2257 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); 2258 break; 2259 case VCPU_EXREG_PDPTR: 2260 if (enable_ept) 2261 ept_save_pdptrs(vcpu); 2262 break; 2263 case VCPU_EXREG_CR0: 2264 guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; 2265 2266 vcpu->arch.cr0 &= ~guest_owned_bits; 2267 vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & guest_owned_bits; 2268 break; 2269 case VCPU_EXREG_CR3: 2270 if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) 2271 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); 2272 break; 2273 case VCPU_EXREG_CR4: 2274 guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; 2275 2276 vcpu->arch.cr4 &= ~guest_owned_bits; 2277 vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & guest_owned_bits; 2278 break; 2279 default: 2280 WARN_ON_ONCE(1); 2281 break; 2282 } 2283 } 2284 2285 static __init int cpu_has_kvm_support(void) 2286 { 2287 return cpu_has_vmx(); 2288 } 2289 2290 static __init int vmx_disabled_by_bios(void) 2291 { 2292 return !boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || 2293 !boot_cpu_has(X86_FEATURE_VMX); 2294 } 2295 2296 static int kvm_cpu_vmxon(u64 vmxon_pointer) 2297 { 2298 u64 msr; 2299 2300 cr4_set_bits(X86_CR4_VMXE); 2301 intel_pt_handle_vmx(1); 2302 2303 asm_volatile_goto("1: vmxon %[vmxon_pointer]\n\t" 2304 _ASM_EXTABLE(1b, %l[fault]) 2305 : : [vmxon_pointer] "m"(vmxon_pointer) 2306 : : fault); 2307 return 0; 2308 2309 fault: 2310 WARN_ONCE(1, "VMXON faulted, MSR_IA32_FEAT_CTL (0x3a) = 0x%llx\n", 2311 rdmsrl_safe(MSR_IA32_FEAT_CTL, &msr) ? 0xdeadbeef : msr); 2312 intel_pt_handle_vmx(0); 2313 cr4_clear_bits(X86_CR4_VMXE); 2314 2315 return -EFAULT; 2316 } 2317 2318 static int hardware_enable(void) 2319 { 2320 int cpu = raw_smp_processor_id(); 2321 u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); 2322 int r; 2323 2324 if (cr4_read_shadow() & X86_CR4_VMXE) 2325 return -EBUSY; 2326 2327 /* 2328 * This can happen if we hot-added a CPU but failed to allocate 2329 * VP assist page for it. 2330 */ 2331 if (static_branch_unlikely(&enable_evmcs) && 2332 !hv_get_vp_assist_page(cpu)) 2333 return -EFAULT; 2334 2335 r = kvm_cpu_vmxon(phys_addr); 2336 if (r) 2337 return r; 2338 2339 if (enable_ept) 2340 ept_sync_global(); 2341 2342 return 0; 2343 } 2344 2345 static void vmclear_local_loaded_vmcss(void) 2346 { 2347 int cpu = raw_smp_processor_id(); 2348 struct loaded_vmcs *v, *n; 2349 2350 list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu), 2351 loaded_vmcss_on_cpu_link) 2352 __loaded_vmcs_clear(v); 2353 } 2354 2355 2356 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() 2357 * tricks. 2358 */ 2359 static void kvm_cpu_vmxoff(void) 2360 { 2361 asm volatile (__ex("vmxoff")); 2362 2363 intel_pt_handle_vmx(0); 2364 cr4_clear_bits(X86_CR4_VMXE); 2365 } 2366 2367 static void hardware_disable(void) 2368 { 2369 vmclear_local_loaded_vmcss(); 2370 kvm_cpu_vmxoff(); 2371 } 2372 2373 /* 2374 * There is no X86_FEATURE for SGX yet, but anyway we need to query CPUID 2375 * directly instead of going through cpu_has(), to ensure KVM is trapping 2376 * ENCLS whenever it's supported in hardware. It does not matter whether 2377 * the host OS supports or has enabled SGX. 2378 */ 2379 static bool cpu_has_sgx(void) 2380 { 2381 return cpuid_eax(0) >= 0x12 && (cpuid_eax(0x12) & BIT(0)); 2382 } 2383 2384 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, 2385 u32 msr, u32 *result) 2386 { 2387 u32 vmx_msr_low, vmx_msr_high; 2388 u32 ctl = ctl_min | ctl_opt; 2389 2390 rdmsr(msr, vmx_msr_low, vmx_msr_high); 2391 2392 ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ 2393 ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ 2394 2395 /* Ensure minimum (required) set of control bits are supported. */ 2396 if (ctl_min & ~ctl) 2397 return -EIO; 2398 2399 *result = ctl; 2400 return 0; 2401 } 2402 2403 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf, 2404 struct vmx_capability *vmx_cap) 2405 { 2406 u32 vmx_msr_low, vmx_msr_high; 2407 u32 min, opt, min2, opt2; 2408 u32 _pin_based_exec_control = 0; 2409 u32 _cpu_based_exec_control = 0; 2410 u32 _cpu_based_2nd_exec_control = 0; 2411 u32 _vmexit_control = 0; 2412 u32 _vmentry_control = 0; 2413 2414 memset(vmcs_conf, 0, sizeof(*vmcs_conf)); 2415 min = CPU_BASED_HLT_EXITING | 2416 #ifdef CONFIG_X86_64 2417 CPU_BASED_CR8_LOAD_EXITING | 2418 CPU_BASED_CR8_STORE_EXITING | 2419 #endif 2420 CPU_BASED_CR3_LOAD_EXITING | 2421 CPU_BASED_CR3_STORE_EXITING | 2422 CPU_BASED_UNCOND_IO_EXITING | 2423 CPU_BASED_MOV_DR_EXITING | 2424 CPU_BASED_USE_TSC_OFFSETTING | 2425 CPU_BASED_MWAIT_EXITING | 2426 CPU_BASED_MONITOR_EXITING | 2427 CPU_BASED_INVLPG_EXITING | 2428 CPU_BASED_RDPMC_EXITING; 2429 2430 opt = CPU_BASED_TPR_SHADOW | 2431 CPU_BASED_USE_MSR_BITMAPS | 2432 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; 2433 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, 2434 &_cpu_based_exec_control) < 0) 2435 return -EIO; 2436 #ifdef CONFIG_X86_64 2437 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) 2438 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & 2439 ~CPU_BASED_CR8_STORE_EXITING; 2440 #endif 2441 if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { 2442 min2 = 0; 2443 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | 2444 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | 2445 SECONDARY_EXEC_WBINVD_EXITING | 2446 SECONDARY_EXEC_ENABLE_VPID | 2447 SECONDARY_EXEC_ENABLE_EPT | 2448 SECONDARY_EXEC_UNRESTRICTED_GUEST | 2449 SECONDARY_EXEC_PAUSE_LOOP_EXITING | 2450 SECONDARY_EXEC_DESC | 2451 SECONDARY_EXEC_RDTSCP | 2452 SECONDARY_EXEC_ENABLE_INVPCID | 2453 SECONDARY_EXEC_APIC_REGISTER_VIRT | 2454 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | 2455 SECONDARY_EXEC_SHADOW_VMCS | 2456 SECONDARY_EXEC_XSAVES | 2457 SECONDARY_EXEC_RDSEED_EXITING | 2458 SECONDARY_EXEC_RDRAND_EXITING | 2459 SECONDARY_EXEC_ENABLE_PML | 2460 SECONDARY_EXEC_TSC_SCALING | 2461 SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE | 2462 SECONDARY_EXEC_PT_USE_GPA | 2463 SECONDARY_EXEC_PT_CONCEAL_VMX | 2464 SECONDARY_EXEC_ENABLE_VMFUNC; 2465 if (cpu_has_sgx()) 2466 opt2 |= SECONDARY_EXEC_ENCLS_EXITING; 2467 if (adjust_vmx_controls(min2, opt2, 2468 MSR_IA32_VMX_PROCBASED_CTLS2, 2469 &_cpu_based_2nd_exec_control) < 0) 2470 return -EIO; 2471 } 2472 #ifndef CONFIG_X86_64 2473 if (!(_cpu_based_2nd_exec_control & 2474 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) 2475 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; 2476 #endif 2477 2478 if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) 2479 _cpu_based_2nd_exec_control &= ~( 2480 SECONDARY_EXEC_APIC_REGISTER_VIRT | 2481 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | 2482 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); 2483 2484 rdmsr_safe(MSR_IA32_VMX_EPT_VPID_CAP, 2485 &vmx_cap->ept, &vmx_cap->vpid); 2486 2487 if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { 2488 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT 2489 enabled */ 2490 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | 2491 CPU_BASED_CR3_STORE_EXITING | 2492 CPU_BASED_INVLPG_EXITING); 2493 } else if (vmx_cap->ept) { 2494 vmx_cap->ept = 0; 2495 pr_warn_once("EPT CAP should not exist if not support " 2496 "1-setting enable EPT VM-execution control\n"); 2497 } 2498 if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_VPID) && 2499 vmx_cap->vpid) { 2500 vmx_cap->vpid = 0; 2501 pr_warn_once("VPID CAP should not exist if not support " 2502 "1-setting enable VPID VM-execution control\n"); 2503 } 2504 2505 min = VM_EXIT_SAVE_DEBUG_CONTROLS | VM_EXIT_ACK_INTR_ON_EXIT; 2506 #ifdef CONFIG_X86_64 2507 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; 2508 #endif 2509 opt = VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL | 2510 VM_EXIT_LOAD_IA32_PAT | 2511 VM_EXIT_LOAD_IA32_EFER | 2512 VM_EXIT_CLEAR_BNDCFGS | 2513 VM_EXIT_PT_CONCEAL_PIP | 2514 VM_EXIT_CLEAR_IA32_RTIT_CTL; 2515 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, 2516 &_vmexit_control) < 0) 2517 return -EIO; 2518 2519 min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; 2520 opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR | 2521 PIN_BASED_VMX_PREEMPTION_TIMER; 2522 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, 2523 &_pin_based_exec_control) < 0) 2524 return -EIO; 2525 2526 if (cpu_has_broken_vmx_preemption_timer()) 2527 _pin_based_exec_control &= ~PIN_BASED_VMX_PREEMPTION_TIMER; 2528 if (!(_cpu_based_2nd_exec_control & 2529 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)) 2530 _pin_based_exec_control &= ~PIN_BASED_POSTED_INTR; 2531 2532 min = VM_ENTRY_LOAD_DEBUG_CONTROLS; 2533 opt = VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | 2534 VM_ENTRY_LOAD_IA32_PAT | 2535 VM_ENTRY_LOAD_IA32_EFER | 2536 VM_ENTRY_LOAD_BNDCFGS | 2537 VM_ENTRY_PT_CONCEAL_PIP | 2538 VM_ENTRY_LOAD_IA32_RTIT_CTL; 2539 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, 2540 &_vmentry_control) < 0) 2541 return -EIO; 2542 2543 /* 2544 * Some cpus support VM_{ENTRY,EXIT}_IA32_PERF_GLOBAL_CTRL but they 2545 * can't be used due to an errata where VM Exit may incorrectly clear 2546 * IA32_PERF_GLOBAL_CTRL[34:32]. Workaround the errata by using the 2547 * MSR load mechanism to switch IA32_PERF_GLOBAL_CTRL. 2548 */ 2549 if (boot_cpu_data.x86 == 0x6) { 2550 switch (boot_cpu_data.x86_model) { 2551 case 26: /* AAK155 */ 2552 case 30: /* AAP115 */ 2553 case 37: /* AAT100 */ 2554 case 44: /* BC86,AAY89,BD102 */ 2555 case 46: /* BA97 */ 2556 _vmentry_control &= ~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL; 2557 _vmexit_control &= ~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL; 2558 pr_warn_once("kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL " 2559 "does not work properly. Using workaround\n"); 2560 break; 2561 default: 2562 break; 2563 } 2564 } 2565 2566 2567 rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); 2568 2569 /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ 2570 if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) 2571 return -EIO; 2572 2573 #ifdef CONFIG_X86_64 2574 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ 2575 if (vmx_msr_high & (1u<<16)) 2576 return -EIO; 2577 #endif 2578 2579 /* Require Write-Back (WB) memory type for VMCS accesses. */ 2580 if (((vmx_msr_high >> 18) & 15) != 6) 2581 return -EIO; 2582 2583 vmcs_conf->size = vmx_msr_high & 0x1fff; 2584 vmcs_conf->order = get_order(vmcs_conf->size); 2585 vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff; 2586 2587 vmcs_conf->revision_id = vmx_msr_low; 2588 2589 vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; 2590 vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; 2591 vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; 2592 vmcs_conf->vmexit_ctrl = _vmexit_control; 2593 vmcs_conf->vmentry_ctrl = _vmentry_control; 2594 2595 if (static_branch_unlikely(&enable_evmcs)) 2596 evmcs_sanitize_exec_ctrls(vmcs_conf); 2597 2598 return 0; 2599 } 2600 2601 struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags) 2602 { 2603 int node = cpu_to_node(cpu); 2604 struct page *pages; 2605 struct vmcs *vmcs; 2606 2607 pages = __alloc_pages_node(node, flags, vmcs_config.order); 2608 if (!pages) 2609 return NULL; 2610 vmcs = page_address(pages); 2611 memset(vmcs, 0, vmcs_config.size); 2612 2613 /* KVM supports Enlightened VMCS v1 only */ 2614 if (static_branch_unlikely(&enable_evmcs)) 2615 vmcs->hdr.revision_id = KVM_EVMCS_VERSION; 2616 else 2617 vmcs->hdr.revision_id = vmcs_config.revision_id; 2618 2619 if (shadow) 2620 vmcs->hdr.shadow_vmcs = 1; 2621 return vmcs; 2622 } 2623 2624 void free_vmcs(struct vmcs *vmcs) 2625 { 2626 free_pages((unsigned long)vmcs, vmcs_config.order); 2627 } 2628 2629 /* 2630 * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded 2631 */ 2632 void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) 2633 { 2634 if (!loaded_vmcs->vmcs) 2635 return; 2636 loaded_vmcs_clear(loaded_vmcs); 2637 free_vmcs(loaded_vmcs->vmcs); 2638 loaded_vmcs->vmcs = NULL; 2639 if (loaded_vmcs->msr_bitmap) 2640 free_page((unsigned long)loaded_vmcs->msr_bitmap); 2641 WARN_ON(loaded_vmcs->shadow_vmcs != NULL); 2642 } 2643 2644 int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) 2645 { 2646 loaded_vmcs->vmcs = alloc_vmcs(false); 2647 if (!loaded_vmcs->vmcs) 2648 return -ENOMEM; 2649 2650 vmcs_clear(loaded_vmcs->vmcs); 2651 2652 loaded_vmcs->shadow_vmcs = NULL; 2653 loaded_vmcs->hv_timer_soft_disabled = false; 2654 loaded_vmcs->cpu = -1; 2655 loaded_vmcs->launched = 0; 2656 2657 if (cpu_has_vmx_msr_bitmap()) { 2658 loaded_vmcs->msr_bitmap = (unsigned long *) 2659 __get_free_page(GFP_KERNEL_ACCOUNT); 2660 if (!loaded_vmcs->msr_bitmap) 2661 goto out_vmcs; 2662 memset(loaded_vmcs->msr_bitmap, 0xff, PAGE_SIZE); 2663 2664 if (IS_ENABLED(CONFIG_HYPERV) && 2665 static_branch_unlikely(&enable_evmcs) && 2666 (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)) { 2667 struct hv_enlightened_vmcs *evmcs = 2668 (struct hv_enlightened_vmcs *)loaded_vmcs->vmcs; 2669 2670 evmcs->hv_enlightenments_control.msr_bitmap = 1; 2671 } 2672 } 2673 2674 memset(&loaded_vmcs->host_state, 0, sizeof(struct vmcs_host_state)); 2675 memset(&loaded_vmcs->controls_shadow, 0, 2676 sizeof(struct vmcs_controls_shadow)); 2677 2678 return 0; 2679 2680 out_vmcs: 2681 free_loaded_vmcs(loaded_vmcs); 2682 return -ENOMEM; 2683 } 2684 2685 static void free_kvm_area(void) 2686 { 2687 int cpu; 2688 2689 for_each_possible_cpu(cpu) { 2690 free_vmcs(per_cpu(vmxarea, cpu)); 2691 per_cpu(vmxarea, cpu) = NULL; 2692 } 2693 } 2694 2695 static __init int alloc_kvm_area(void) 2696 { 2697 int cpu; 2698 2699 for_each_possible_cpu(cpu) { 2700 struct vmcs *vmcs; 2701 2702 vmcs = alloc_vmcs_cpu(false, cpu, GFP_KERNEL); 2703 if (!vmcs) { 2704 free_kvm_area(); 2705 return -ENOMEM; 2706 } 2707 2708 /* 2709 * When eVMCS is enabled, alloc_vmcs_cpu() sets 2710 * vmcs->revision_id to KVM_EVMCS_VERSION instead of 2711 * revision_id reported by MSR_IA32_VMX_BASIC. 2712 * 2713 * However, even though not explicitly documented by 2714 * TLFS, VMXArea passed as VMXON argument should 2715 * still be marked with revision_id reported by 2716 * physical CPU. 2717 */ 2718 if (static_branch_unlikely(&enable_evmcs)) 2719 vmcs->hdr.revision_id = vmcs_config.revision_id; 2720 2721 per_cpu(vmxarea, cpu) = vmcs; 2722 } 2723 return 0; 2724 } 2725 2726 static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg, 2727 struct kvm_segment *save) 2728 { 2729 if (!emulate_invalid_guest_state) { 2730 /* 2731 * CS and SS RPL should be equal during guest entry according 2732 * to VMX spec, but in reality it is not always so. Since vcpu 2733 * is in the middle of the transition from real mode to 2734 * protected mode it is safe to assume that RPL 0 is a good 2735 * default value. 2736 */ 2737 if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS) 2738 save->selector &= ~SEGMENT_RPL_MASK; 2739 save->dpl = save->selector & SEGMENT_RPL_MASK; 2740 save->s = 1; 2741 } 2742 vmx_set_segment(vcpu, save, seg); 2743 } 2744 2745 static void enter_pmode(struct kvm_vcpu *vcpu) 2746 { 2747 unsigned long flags; 2748 struct vcpu_vmx *vmx = to_vmx(vcpu); 2749 2750 /* 2751 * Update real mode segment cache. It may be not up-to-date if sement 2752 * register was written while vcpu was in a guest mode. 2753 */ 2754 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); 2755 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); 2756 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); 2757 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); 2758 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); 2759 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); 2760 2761 vmx->rmode.vm86_active = 0; 2762 2763 vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); 2764 2765 flags = vmcs_readl(GUEST_RFLAGS); 2766 flags &= RMODE_GUEST_OWNED_EFLAGS_BITS; 2767 flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; 2768 vmcs_writel(GUEST_RFLAGS, flags); 2769 2770 vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | 2771 (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); 2772 2773 update_exception_bitmap(vcpu); 2774 2775 fix_pmode_seg(vcpu, VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); 2776 fix_pmode_seg(vcpu, VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); 2777 fix_pmode_seg(vcpu, VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); 2778 fix_pmode_seg(vcpu, VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); 2779 fix_pmode_seg(vcpu, VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); 2780 fix_pmode_seg(vcpu, VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); 2781 } 2782 2783 static void fix_rmode_seg(int seg, struct kvm_segment *save) 2784 { 2785 const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; 2786 struct kvm_segment var = *save; 2787 2788 var.dpl = 0x3; 2789 if (seg == VCPU_SREG_CS) 2790 var.type = 0x3; 2791 2792 if (!emulate_invalid_guest_state) { 2793 var.selector = var.base >> 4; 2794 var.base = var.base & 0xffff0; 2795 var.limit = 0xffff; 2796 var.g = 0; 2797 var.db = 0; 2798 var.present = 1; 2799 var.s = 1; 2800 var.l = 0; 2801 var.unusable = 0; 2802 var.type = 0x3; 2803 var.avl = 0; 2804 if (save->base & 0xf) 2805 printk_once(KERN_WARNING "kvm: segment base is not " 2806 "paragraph aligned when entering " 2807 "protected mode (seg=%d)", seg); 2808 } 2809 2810 vmcs_write16(sf->selector, var.selector); 2811 vmcs_writel(sf->base, var.base); 2812 vmcs_write32(sf->limit, var.limit); 2813 vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(&var)); 2814 } 2815 2816 static void enter_rmode(struct kvm_vcpu *vcpu) 2817 { 2818 unsigned long flags; 2819 struct vcpu_vmx *vmx = to_vmx(vcpu); 2820 struct kvm_vmx *kvm_vmx = to_kvm_vmx(vcpu->kvm); 2821 2822 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); 2823 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); 2824 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); 2825 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); 2826 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); 2827 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); 2828 vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); 2829 2830 vmx->rmode.vm86_active = 1; 2831 2832 /* 2833 * Very old userspace does not call KVM_SET_TSS_ADDR before entering 2834 * vcpu. Warn the user that an update is overdue. 2835 */ 2836 if (!kvm_vmx->tss_addr) 2837 printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be " 2838 "called before entering vcpu\n"); 2839 2840 vmx_segment_cache_clear(vmx); 2841 2842 vmcs_writel(GUEST_TR_BASE, kvm_vmx->tss_addr); 2843 vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); 2844 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); 2845 2846 flags = vmcs_readl(GUEST_RFLAGS); 2847 vmx->rmode.save_rflags = flags; 2848 2849 flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; 2850 2851 vmcs_writel(GUEST_RFLAGS, flags); 2852 vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); 2853 update_exception_bitmap(vcpu); 2854 2855 fix_rmode_seg(VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); 2856 fix_rmode_seg(VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); 2857 fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); 2858 fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); 2859 fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); 2860 fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); 2861 2862 kvm_mmu_reset_context(vcpu); 2863 } 2864 2865 void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) 2866 { 2867 struct vcpu_vmx *vmx = to_vmx(vcpu); 2868 struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); 2869 2870 if (!msr) 2871 return; 2872 2873 vcpu->arch.efer = efer; 2874 if (efer & EFER_LMA) { 2875 vm_entry_controls_setbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); 2876 msr->data = efer; 2877 } else { 2878 vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); 2879 2880 msr->data = efer & ~EFER_LME; 2881 } 2882 setup_msrs(vmx); 2883 } 2884 2885 #ifdef CONFIG_X86_64 2886 2887 static void enter_lmode(struct kvm_vcpu *vcpu) 2888 { 2889 u32 guest_tr_ar; 2890 2891 vmx_segment_cache_clear(to_vmx(vcpu)); 2892 2893 guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); 2894 if ((guest_tr_ar & VMX_AR_TYPE_MASK) != VMX_AR_TYPE_BUSY_64_TSS) { 2895 pr_debug_ratelimited("%s: tss fixup for long mode. \n", 2896 __func__); 2897 vmcs_write32(GUEST_TR_AR_BYTES, 2898 (guest_tr_ar & ~VMX_AR_TYPE_MASK) 2899 | VMX_AR_TYPE_BUSY_64_TSS); 2900 } 2901 vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA); 2902 } 2903 2904 static void exit_lmode(struct kvm_vcpu *vcpu) 2905 { 2906 vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); 2907 vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA); 2908 } 2909 2910 #endif 2911 2912 static void vmx_flush_tlb_all(struct kvm_vcpu *vcpu) 2913 { 2914 struct vcpu_vmx *vmx = to_vmx(vcpu); 2915 2916 /* 2917 * INVEPT must be issued when EPT is enabled, irrespective of VPID, as 2918 * the CPU is not required to invalidate guest-physical mappings on 2919 * VM-Entry, even if VPID is disabled. Guest-physical mappings are 2920 * associated with the root EPT structure and not any particular VPID 2921 * (INVVPID also isn't required to invalidate guest-physical mappings). 2922 */ 2923 if (enable_ept) { 2924 ept_sync_global(); 2925 } else if (enable_vpid) { 2926 if (cpu_has_vmx_invvpid_global()) { 2927 vpid_sync_vcpu_global(); 2928 } else { 2929 vpid_sync_vcpu_single(vmx->vpid); 2930 vpid_sync_vcpu_single(vmx->nested.vpid02); 2931 } 2932 } 2933 } 2934 2935 static void vmx_flush_tlb_current(struct kvm_vcpu *vcpu) 2936 { 2937 struct kvm_mmu *mmu = vcpu->arch.mmu; 2938 u64 root_hpa = mmu->root_hpa; 2939 2940 /* No flush required if the current context is invalid. */ 2941 if (!VALID_PAGE(root_hpa)) 2942 return; 2943 2944 if (enable_ept) 2945 ept_sync_context(construct_eptp(vcpu, root_hpa, 2946 mmu->shadow_root_level)); 2947 else if (!is_guest_mode(vcpu)) 2948 vpid_sync_context(to_vmx(vcpu)->vpid); 2949 else 2950 vpid_sync_context(nested_get_vpid02(vcpu)); 2951 } 2952 2953 static void vmx_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t addr) 2954 { 2955 /* 2956 * vpid_sync_vcpu_addr() is a nop if vmx->vpid==0, see the comment in 2957 * vmx_flush_tlb_guest() for an explanation of why this is ok. 2958 */ 2959 vpid_sync_vcpu_addr(to_vmx(vcpu)->vpid, addr); 2960 } 2961 2962 static void vmx_flush_tlb_guest(struct kvm_vcpu *vcpu) 2963 { 2964 /* 2965 * vpid_sync_context() is a nop if vmx->vpid==0, e.g. if enable_vpid==0 2966 * or a vpid couldn't be allocated for this vCPU. VM-Enter and VM-Exit 2967 * are required to flush GVA->{G,H}PA mappings from the TLB if vpid is 2968 * disabled (VM-Enter with vpid enabled and vpid==0 is disallowed), 2969 * i.e. no explicit INVVPID is necessary. 2970 */ 2971 vpid_sync_context(to_vmx(vcpu)->vpid); 2972 } 2973 2974 static void ept_load_pdptrs(struct kvm_vcpu *vcpu) 2975 { 2976 struct kvm_mmu *mmu = vcpu->arch.walk_mmu; 2977 2978 if (!kvm_register_is_dirty(vcpu, VCPU_EXREG_PDPTR)) 2979 return; 2980 2981 if (is_pae_paging(vcpu)) { 2982 vmcs_write64(GUEST_PDPTR0, mmu->pdptrs[0]); 2983 vmcs_write64(GUEST_PDPTR1, mmu->pdptrs[1]); 2984 vmcs_write64(GUEST_PDPTR2, mmu->pdptrs[2]); 2985 vmcs_write64(GUEST_PDPTR3, mmu->pdptrs[3]); 2986 } 2987 } 2988 2989 void ept_save_pdptrs(struct kvm_vcpu *vcpu) 2990 { 2991 struct kvm_mmu *mmu = vcpu->arch.walk_mmu; 2992 2993 if (WARN_ON_ONCE(!is_pae_paging(vcpu))) 2994 return; 2995 2996 mmu->pdptrs[0] = vmcs_read64(GUEST_PDPTR0); 2997 mmu->pdptrs[1] = vmcs_read64(GUEST_PDPTR1); 2998 mmu->pdptrs[2] = vmcs_read64(GUEST_PDPTR2); 2999 mmu->pdptrs[3] = vmcs_read64(GUEST_PDPTR3); 3000 3001 kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR); 3002 } 3003 3004 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, 3005 unsigned long cr0, 3006 struct kvm_vcpu *vcpu) 3007 { 3008 struct vcpu_vmx *vmx = to_vmx(vcpu); 3009 3010 if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) 3011 vmx_cache_reg(vcpu, VCPU_EXREG_CR3); 3012 if (!(cr0 & X86_CR0_PG)) { 3013 /* From paging/starting to nonpaging */ 3014 exec_controls_setbit(vmx, CPU_BASED_CR3_LOAD_EXITING | 3015 CPU_BASED_CR3_STORE_EXITING); 3016 vcpu->arch.cr0 = cr0; 3017 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); 3018 } else if (!is_paging(vcpu)) { 3019 /* From nonpaging to paging */ 3020 exec_controls_clearbit(vmx, CPU_BASED_CR3_LOAD_EXITING | 3021 CPU_BASED_CR3_STORE_EXITING); 3022 vcpu->arch.cr0 = cr0; 3023 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); 3024 } 3025 3026 if (!(cr0 & X86_CR0_WP)) 3027 *hw_cr0 &= ~X86_CR0_WP; 3028 } 3029 3030 void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) 3031 { 3032 struct vcpu_vmx *vmx = to_vmx(vcpu); 3033 unsigned long hw_cr0; 3034 3035 hw_cr0 = (cr0 & ~KVM_VM_CR0_ALWAYS_OFF); 3036 if (enable_unrestricted_guest) 3037 hw_cr0 |= KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; 3038 else { 3039 hw_cr0 |= KVM_VM_CR0_ALWAYS_ON; 3040 3041 if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) 3042 enter_pmode(vcpu); 3043 3044 if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) 3045 enter_rmode(vcpu); 3046 } 3047 3048 #ifdef CONFIG_X86_64 3049 if (vcpu->arch.efer & EFER_LME) { 3050 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) 3051 enter_lmode(vcpu); 3052 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) 3053 exit_lmode(vcpu); 3054 } 3055 #endif 3056 3057 if (enable_ept && !enable_unrestricted_guest) 3058 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); 3059 3060 vmcs_writel(CR0_READ_SHADOW, cr0); 3061 vmcs_writel(GUEST_CR0, hw_cr0); 3062 vcpu->arch.cr0 = cr0; 3063 kvm_register_mark_available(vcpu, VCPU_EXREG_CR0); 3064 3065 /* depends on vcpu->arch.cr0 to be set to a new value */ 3066 vmx->emulation_required = emulation_required(vcpu); 3067 } 3068 3069 static int vmx_get_max_tdp_level(void) 3070 { 3071 if (cpu_has_vmx_ept_5levels()) 3072 return 5; 3073 return 4; 3074 } 3075 3076 u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa, 3077 int root_level) 3078 { 3079 u64 eptp = VMX_EPTP_MT_WB; 3080 3081 eptp |= (root_level == 5) ? VMX_EPTP_PWL_5 : VMX_EPTP_PWL_4; 3082 3083 if (enable_ept_ad_bits && 3084 (!is_guest_mode(vcpu) || nested_ept_ad_enabled(vcpu))) 3085 eptp |= VMX_EPTP_AD_ENABLE_BIT; 3086 eptp |= (root_hpa & PAGE_MASK); 3087 3088 return eptp; 3089 } 3090 3091 static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long pgd, 3092 int pgd_level) 3093 { 3094 struct kvm *kvm = vcpu->kvm; 3095 bool update_guest_cr3 = true; 3096 unsigned long guest_cr3; 3097 u64 eptp; 3098 3099 if (enable_ept) { 3100 eptp = construct_eptp(vcpu, pgd, pgd_level); 3101 vmcs_write64(EPT_POINTER, eptp); 3102 3103 if (kvm_x86_ops.tlb_remote_flush) { 3104 spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock); 3105 to_vmx(vcpu)->ept_pointer = eptp; 3106 to_kvm_vmx(kvm)->ept_pointers_match 3107 = EPT_POINTERS_CHECK; 3108 spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); 3109 } 3110 3111 if (!enable_unrestricted_guest && !is_paging(vcpu)) 3112 guest_cr3 = to_kvm_vmx(kvm)->ept_identity_map_addr; 3113 else if (test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) 3114 guest_cr3 = vcpu->arch.cr3; 3115 else /* vmcs01.GUEST_CR3 is already up-to-date. */ 3116 update_guest_cr3 = false; 3117 ept_load_pdptrs(vcpu); 3118 } else { 3119 guest_cr3 = pgd; 3120 } 3121 3122 if (update_guest_cr3) 3123 vmcs_writel(GUEST_CR3, guest_cr3); 3124 } 3125 3126 int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) 3127 { 3128 struct vcpu_vmx *vmx = to_vmx(vcpu); 3129 /* 3130 * Pass through host's Machine Check Enable value to hw_cr4, which 3131 * is in force while we are in guest mode. Do not let guests control 3132 * this bit, even if host CR4.MCE == 0. 3133 */ 3134 unsigned long hw_cr4; 3135 3136 hw_cr4 = (cr4_read_shadow() & X86_CR4_MCE) | (cr4 & ~X86_CR4_MCE); 3137 if (enable_unrestricted_guest) 3138 hw_cr4 |= KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST; 3139 else if (vmx->rmode.vm86_active) 3140 hw_cr4 |= KVM_RMODE_VM_CR4_ALWAYS_ON; 3141 else 3142 hw_cr4 |= KVM_PMODE_VM_CR4_ALWAYS_ON; 3143 3144 if (!boot_cpu_has(X86_FEATURE_UMIP) && vmx_umip_emulated()) { 3145 if (cr4 & X86_CR4_UMIP) { 3146 secondary_exec_controls_setbit(vmx, SECONDARY_EXEC_DESC); 3147 hw_cr4 &= ~X86_CR4_UMIP; 3148 } else if (!is_guest_mode(vcpu) || 3149 !nested_cpu_has2(get_vmcs12(vcpu), SECONDARY_EXEC_DESC)) { 3150 secondary_exec_controls_clearbit(vmx, SECONDARY_EXEC_DESC); 3151 } 3152 } 3153 3154 if (cr4 & X86_CR4_VMXE) { 3155 /* 3156 * To use VMXON (and later other VMX instructions), a guest 3157 * must first be able to turn on cr4.VMXE (see handle_vmon()). 3158 * So basically the check on whether to allow nested VMX 3159 * is here. We operate under the default treatment of SMM, 3160 * so VMX cannot be enabled under SMM. 3161 */ 3162 if (!nested_vmx_allowed(vcpu) || is_smm(vcpu)) 3163 return 1; 3164 } 3165 3166 if (vmx->nested.vmxon && !nested_cr4_valid(vcpu, cr4)) 3167 return 1; 3168 3169 vcpu->arch.cr4 = cr4; 3170 kvm_register_mark_available(vcpu, VCPU_EXREG_CR4); 3171 3172 if (!enable_unrestricted_guest) { 3173 if (enable_ept) { 3174 if (!is_paging(vcpu)) { 3175 hw_cr4 &= ~X86_CR4_PAE; 3176 hw_cr4 |= X86_CR4_PSE; 3177 } else if (!(cr4 & X86_CR4_PAE)) { 3178 hw_cr4 &= ~X86_CR4_PAE; 3179 } 3180 } 3181 3182 /* 3183 * SMEP/SMAP/PKU is disabled if CPU is in non-paging mode in 3184 * hardware. To emulate this behavior, SMEP/SMAP/PKU needs 3185 * to be manually disabled when guest switches to non-paging 3186 * mode. 3187 * 3188 * If !enable_unrestricted_guest, the CPU is always running 3189 * with CR0.PG=1 and CR4 needs to be modified. 3190 * If enable_unrestricted_guest, the CPU automatically 3191 * disables SMEP/SMAP/PKU when the guest sets CR0.PG=0. 3192 */ 3193 if (!is_paging(vcpu)) 3194 hw_cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE); 3195 } 3196 3197 vmcs_writel(CR4_READ_SHADOW, cr4); 3198 vmcs_writel(GUEST_CR4, hw_cr4); 3199 return 0; 3200 } 3201 3202 void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) 3203 { 3204 struct vcpu_vmx *vmx = to_vmx(vcpu); 3205 u32 ar; 3206 3207 if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { 3208 *var = vmx->rmode.segs[seg]; 3209 if (seg == VCPU_SREG_TR 3210 || var->selector == vmx_read_guest_seg_selector(vmx, seg)) 3211 return; 3212 var->base = vmx_read_guest_seg_base(vmx, seg); 3213 var->selector = vmx_read_guest_seg_selector(vmx, seg); 3214 return; 3215 } 3216 var->base = vmx_read_guest_seg_base(vmx, seg); 3217 var->limit = vmx_read_guest_seg_limit(vmx, seg); 3218 var->selector = vmx_read_guest_seg_selector(vmx, seg); 3219 ar = vmx_read_guest_seg_ar(vmx, seg); 3220 var->unusable = (ar >> 16) & 1; 3221 var->type = ar & 15; 3222 var->s = (ar >> 4) & 1; 3223 var->dpl = (ar >> 5) & 3; 3224 /* 3225 * Some userspaces do not preserve unusable property. Since usable 3226 * segment has to be present according to VMX spec we can use present 3227 * property to amend userspace bug by making unusable segment always 3228 * nonpresent. vmx_segment_access_rights() already marks nonpresent 3229 * segment as unusable. 3230 */ 3231 var->present = !var->unusable; 3232 var->avl = (ar >> 12) & 1; 3233 var->l = (ar >> 13) & 1; 3234 var->db = (ar >> 14) & 1; 3235 var->g = (ar >> 15) & 1; 3236 } 3237 3238 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) 3239 { 3240 struct kvm_segment s; 3241 3242 if (to_vmx(vcpu)->rmode.vm86_active) { 3243 vmx_get_segment(vcpu, &s, seg); 3244 return s.base; 3245 } 3246 return vmx_read_guest_seg_base(to_vmx(vcpu), seg); 3247 } 3248 3249 int vmx_get_cpl(struct kvm_vcpu *vcpu) 3250 { 3251 struct vcpu_vmx *vmx = to_vmx(vcpu); 3252 3253 if (unlikely(vmx->rmode.vm86_active)) 3254 return 0; 3255 else { 3256 int ar = vmx_read_guest_seg_ar(vmx, VCPU_SREG_SS); 3257 return VMX_AR_DPL(ar); 3258 } 3259 } 3260 3261 static u32 vmx_segment_access_rights(struct kvm_segment *var) 3262 { 3263 u32 ar; 3264 3265 if (var->unusable || !var->present) 3266 ar = 1 << 16; 3267 else { 3268 ar = var->type & 15; 3269 ar |= (var->s & 1) << 4; 3270 ar |= (var->dpl & 3) << 5; 3271 ar |= (var->present & 1) << 7; 3272 ar |= (var->avl & 1) << 12; 3273 ar |= (var->l & 1) << 13; 3274 ar |= (var->db & 1) << 14; 3275 ar |= (var->g & 1) << 15; 3276 } 3277 3278 return ar; 3279 } 3280 3281 void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) 3282 { 3283 struct vcpu_vmx *vmx = to_vmx(vcpu); 3284 const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; 3285 3286 vmx_segment_cache_clear(vmx); 3287 3288 if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { 3289 vmx->rmode.segs[seg] = *var; 3290 if (seg == VCPU_SREG_TR) 3291 vmcs_write16(sf->selector, var->selector); 3292 else if (var->s) 3293 fix_rmode_seg(seg, &vmx->rmode.segs[seg]); 3294 goto out; 3295 } 3296 3297 vmcs_writel(sf->base, var->base); 3298 vmcs_write32(sf->limit, var->limit); 3299 vmcs_write16(sf->selector, var->selector); 3300 3301 /* 3302 * Fix the "Accessed" bit in AR field of segment registers for older 3303 * qemu binaries. 3304 * IA32 arch specifies that at the time of processor reset the 3305 * "Accessed" bit in the AR field of segment registers is 1. And qemu 3306 * is setting it to 0 in the userland code. This causes invalid guest 3307 * state vmexit when "unrestricted guest" mode is turned on. 3308 * Fix for this setup issue in cpu_reset is being pushed in the qemu 3309 * tree. Newer qemu binaries with that qemu fix would not need this 3310 * kvm hack. 3311 */ 3312 if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) 3313 var->type |= 0x1; /* Accessed */ 3314 3315 vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var)); 3316 3317 out: 3318 vmx->emulation_required = emulation_required(vcpu); 3319 } 3320 3321 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) 3322 { 3323 u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS); 3324 3325 *db = (ar >> 14) & 1; 3326 *l = (ar >> 13) & 1; 3327 } 3328 3329 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) 3330 { 3331 dt->size = vmcs_read32(GUEST_IDTR_LIMIT); 3332 dt->address = vmcs_readl(GUEST_IDTR_BASE); 3333 } 3334 3335 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) 3336 { 3337 vmcs_write32(GUEST_IDTR_LIMIT, dt->size); 3338 vmcs_writel(GUEST_IDTR_BASE, dt->address); 3339 } 3340 3341 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) 3342 { 3343 dt->size = vmcs_read32(GUEST_GDTR_LIMIT); 3344 dt->address = vmcs_readl(GUEST_GDTR_BASE); 3345 } 3346 3347 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) 3348 { 3349 vmcs_write32(GUEST_GDTR_LIMIT, dt->size); 3350 vmcs_writel(GUEST_GDTR_BASE, dt->address); 3351 } 3352 3353 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) 3354 { 3355 struct kvm_segment var; 3356 u32 ar; 3357 3358 vmx_get_segment(vcpu, &var, seg); 3359 var.dpl = 0x3; 3360 if (seg == VCPU_SREG_CS) 3361 var.type = 0x3; 3362 ar = vmx_segment_access_rights(&var); 3363 3364 if (var.base != (var.selector << 4)) 3365 return false; 3366 if (var.limit != 0xffff) 3367 return false; 3368 if (ar != 0xf3) 3369 return false; 3370 3371 return true; 3372 } 3373 3374 static bool code_segment_valid(struct kvm_vcpu *vcpu) 3375 { 3376 struct kvm_segment cs; 3377 unsigned int cs_rpl; 3378 3379 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); 3380 cs_rpl = cs.selector & SEGMENT_RPL_MASK; 3381 3382 if (cs.unusable) 3383 return false; 3384 if (~cs.type & (VMX_AR_TYPE_CODE_MASK|VMX_AR_TYPE_ACCESSES_MASK)) 3385 return false; 3386 if (!cs.s) 3387 return false; 3388 if (cs.type & VMX_AR_TYPE_WRITEABLE_MASK) { 3389 if (cs.dpl > cs_rpl) 3390 return false; 3391 } else { 3392 if (cs.dpl != cs_rpl) 3393 return false; 3394 } 3395 if (!cs.present) 3396 return false; 3397 3398 /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ 3399 return true; 3400 } 3401 3402 static bool stack_segment_valid(struct kvm_vcpu *vcpu) 3403 { 3404 struct kvm_segment ss; 3405 unsigned int ss_rpl; 3406 3407 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); 3408 ss_rpl = ss.selector & SEGMENT_RPL_MASK; 3409 3410 if (ss.unusable) 3411 return true; 3412 if (ss.type != 3 && ss.type != 7) 3413 return false; 3414 if (!ss.s) 3415 return false; 3416 if (ss.dpl != ss_rpl) /* DPL != RPL */ 3417 return false; 3418 if (!ss.present) 3419 return false; 3420 3421 return true; 3422 } 3423 3424 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) 3425 { 3426 struct kvm_segment var; 3427 unsigned int rpl; 3428 3429 vmx_get_segment(vcpu, &var, seg); 3430 rpl = var.selector & SEGMENT_RPL_MASK; 3431 3432 if (var.unusable) 3433 return true; 3434 if (!var.s) 3435 return false; 3436 if (!var.present) 3437 return false; 3438 if (~var.type & (VMX_AR_TYPE_CODE_MASK|VMX_AR_TYPE_WRITEABLE_MASK)) { 3439 if (var.dpl < rpl) /* DPL < RPL */ 3440 return false; 3441 } 3442 3443 /* TODO: Add other members to kvm_segment_field to allow checking for other access 3444 * rights flags 3445 */ 3446 return true; 3447 } 3448 3449 static bool tr_valid(struct kvm_vcpu *vcpu) 3450 { 3451 struct kvm_segment tr; 3452 3453 vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); 3454 3455 if (tr.unusable) 3456 return false; 3457 if (tr.selector & SEGMENT_TI_MASK) /* TI = 1 */ 3458 return false; 3459 if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ 3460 return false; 3461 if (!tr.present) 3462 return false; 3463 3464 return true; 3465 } 3466 3467 static bool ldtr_valid(struct kvm_vcpu *vcpu) 3468 { 3469 struct kvm_segment ldtr; 3470 3471 vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); 3472 3473 if (ldtr.unusable) 3474 return true; 3475 if (ldtr.selector & SEGMENT_TI_MASK) /* TI = 1 */ 3476 return false; 3477 if (ldtr.type != 2) 3478 return false; 3479 if (!ldtr.present) 3480 return false; 3481 3482 return true; 3483 } 3484 3485 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) 3486 { 3487 struct kvm_segment cs, ss; 3488 3489 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); 3490 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); 3491 3492 return ((cs.selector & SEGMENT_RPL_MASK) == 3493 (ss.selector & SEGMENT_RPL_MASK)); 3494 } 3495 3496 /* 3497 * Check if guest state is valid. Returns true if valid, false if 3498 * not. 3499 * We assume that registers are always usable 3500 */ 3501 static bool guest_state_valid(struct kvm_vcpu *vcpu) 3502 { 3503 if (enable_unrestricted_guest) 3504 return true; 3505 3506 /* real mode guest state checks */ 3507 if (!is_protmode(vcpu) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) { 3508 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) 3509 return false; 3510 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) 3511 return false; 3512 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) 3513 return false; 3514 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) 3515 return false; 3516 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) 3517 return false; 3518 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) 3519 return false; 3520 } else { 3521 /* protected mode guest state checks */ 3522 if (!cs_ss_rpl_check(vcpu)) 3523 return false; 3524 if (!code_segment_valid(vcpu)) 3525 return false; 3526 if (!stack_segment_valid(vcpu)) 3527 return false; 3528 if (!data_segment_valid(vcpu, VCPU_SREG_DS)) 3529 return false; 3530 if (!data_segment_valid(vcpu, VCPU_SREG_ES)) 3531 return false; 3532 if (!data_segment_valid(vcpu, VCPU_SREG_FS)) 3533 return false; 3534 if (!data_segment_valid(vcpu, VCPU_SREG_GS)) 3535 return false; 3536 if (!tr_valid(vcpu)) 3537 return false; 3538 if (!ldtr_valid(vcpu)) 3539 return false; 3540 } 3541 /* TODO: 3542 * - Add checks on RIP 3543 * - Add checks on RFLAGS 3544 */ 3545 3546 return true; 3547 } 3548 3549 static int init_rmode_tss(struct kvm *kvm) 3550 { 3551 gfn_t fn; 3552 u16 data = 0; 3553 int idx, r; 3554 3555 idx = srcu_read_lock(&kvm->srcu); 3556 fn = to_kvm_vmx(kvm)->tss_addr >> PAGE_SHIFT; 3557 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); 3558 if (r < 0) 3559 goto out; 3560 data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; 3561 r = kvm_write_guest_page(kvm, fn++, &data, 3562 TSS_IOPB_BASE_OFFSET, sizeof(u16)); 3563 if (r < 0) 3564 goto out; 3565 r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); 3566 if (r < 0) 3567 goto out; 3568 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); 3569 if (r < 0) 3570 goto out; 3571 data = ~0; 3572 r = kvm_write_guest_page(kvm, fn, &data, 3573 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, 3574 sizeof(u8)); 3575 out: 3576 srcu_read_unlock(&kvm->srcu, idx); 3577 return r; 3578 } 3579 3580 static int init_rmode_identity_map(struct kvm *kvm) 3581 { 3582 struct kvm_vmx *kvm_vmx = to_kvm_vmx(kvm); 3583 int i, r = 0; 3584 kvm_pfn_t identity_map_pfn; 3585 u32 tmp; 3586 3587 /* Protect kvm_vmx->ept_identity_pagetable_done. */ 3588 mutex_lock(&kvm->slots_lock); 3589 3590 if (likely(kvm_vmx->ept_identity_pagetable_done)) 3591 goto out; 3592 3593 if (!kvm_vmx->ept_identity_map_addr) 3594 kvm_vmx->ept_identity_map_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR; 3595 identity_map_pfn = kvm_vmx->ept_identity_map_addr >> PAGE_SHIFT; 3596 3597 r = __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 3598 kvm_vmx->ept_identity_map_addr, PAGE_SIZE); 3599 if (r < 0) 3600 goto out; 3601 3602 r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); 3603 if (r < 0) 3604 goto out; 3605 /* Set up identity-mapping pagetable for EPT in real mode */ 3606 for (i = 0; i < PT32_ENT_PER_PAGE; i++) { 3607 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | 3608 _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); 3609 r = kvm_write_guest_page(kvm, identity_map_pfn, 3610 &tmp, i * sizeof(tmp), sizeof(tmp)); 3611 if (r < 0) 3612 goto out; 3613 } 3614 kvm_vmx->ept_identity_pagetable_done = true; 3615 3616 out: 3617 mutex_unlock(&kvm->slots_lock); 3618 return r; 3619 } 3620 3621 static void seg_setup(int seg) 3622 { 3623 const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; 3624 unsigned int ar; 3625 3626 vmcs_write16(sf->selector, 0); 3627 vmcs_writel(sf->base, 0); 3628 vmcs_write32(sf->limit, 0xffff); 3629 ar = 0x93; 3630 if (seg == VCPU_SREG_CS) 3631 ar |= 0x08; /* code segment */ 3632 3633 vmcs_write32(sf->ar_bytes, ar); 3634 } 3635 3636 static int alloc_apic_access_page(struct kvm *kvm) 3637 { 3638 struct page *page; 3639 int r = 0; 3640 3641 mutex_lock(&kvm->slots_lock); 3642 if (kvm->arch.apic_access_page_done) 3643 goto out; 3644 r = __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 3645 APIC_DEFAULT_PHYS_BASE, PAGE_SIZE); 3646 if (r) 3647 goto out; 3648 3649 page = gfn_to_page(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 3650 if (is_error_page(page)) { 3651 r = -EFAULT; 3652 goto out; 3653 } 3654 3655 /* 3656 * Do not pin the page in memory, so that memory hot-unplug 3657 * is able to migrate it. 3658 */ 3659 put_page(page); 3660 kvm->arch.apic_access_page_done = true; 3661 out: 3662 mutex_unlock(&kvm->slots_lock); 3663 return r; 3664 } 3665 3666 int allocate_vpid(void) 3667 { 3668 int vpid; 3669 3670 if (!enable_vpid) 3671 return 0; 3672 spin_lock(&vmx_vpid_lock); 3673 vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); 3674 if (vpid < VMX_NR_VPIDS) 3675 __set_bit(vpid, vmx_vpid_bitmap); 3676 else 3677 vpid = 0; 3678 spin_unlock(&vmx_vpid_lock); 3679 return vpid; 3680 } 3681 3682 void free_vpid(int vpid) 3683 { 3684 if (!enable_vpid || vpid == 0) 3685 return; 3686 spin_lock(&vmx_vpid_lock); 3687 __clear_bit(vpid, vmx_vpid_bitmap); 3688 spin_unlock(&vmx_vpid_lock); 3689 } 3690 3691 static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, 3692 u32 msr, int type) 3693 { 3694 int f = sizeof(unsigned long); 3695 3696 if (!cpu_has_vmx_msr_bitmap()) 3697 return; 3698 3699 if (static_branch_unlikely(&enable_evmcs)) 3700 evmcs_touch_msr_bitmap(); 3701 3702 /* 3703 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals 3704 * have the write-low and read-high bitmap offsets the wrong way round. 3705 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. 3706 */ 3707 if (msr <= 0x1fff) { 3708 if (type & MSR_TYPE_R) 3709 /* read-low */ 3710 __clear_bit(msr, msr_bitmap + 0x000 / f); 3711 3712 if (type & MSR_TYPE_W) 3713 /* write-low */ 3714 __clear_bit(msr, msr_bitmap + 0x800 / f); 3715 3716 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { 3717 msr &= 0x1fff; 3718 if (type & MSR_TYPE_R) 3719 /* read-high */ 3720 __clear_bit(msr, msr_bitmap + 0x400 / f); 3721 3722 if (type & MSR_TYPE_W) 3723 /* write-high */ 3724 __clear_bit(msr, msr_bitmap + 0xc00 / f); 3725 3726 } 3727 } 3728 3729 static __always_inline void vmx_enable_intercept_for_msr(unsigned long *msr_bitmap, 3730 u32 msr, int type) 3731 { 3732 int f = sizeof(unsigned long); 3733 3734 if (!cpu_has_vmx_msr_bitmap()) 3735 return; 3736 3737 if (static_branch_unlikely(&enable_evmcs)) 3738 evmcs_touch_msr_bitmap(); 3739 3740 /* 3741 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals 3742 * have the write-low and read-high bitmap offsets the wrong way round. 3743 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. 3744 */ 3745 if (msr <= 0x1fff) { 3746 if (type & MSR_TYPE_R) 3747 /* read-low */ 3748 __set_bit(msr, msr_bitmap + 0x000 / f); 3749 3750 if (type & MSR_TYPE_W) 3751 /* write-low */ 3752 __set_bit(msr, msr_bitmap + 0x800 / f); 3753 3754 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { 3755 msr &= 0x1fff; 3756 if (type & MSR_TYPE_R) 3757 /* read-high */ 3758 __set_bit(msr, msr_bitmap + 0x400 / f); 3759 3760 if (type & MSR_TYPE_W) 3761 /* write-high */ 3762 __set_bit(msr, msr_bitmap + 0xc00 / f); 3763 3764 } 3765 } 3766 3767 static __always_inline void vmx_set_intercept_for_msr(unsigned long *msr_bitmap, 3768 u32 msr, int type, bool value) 3769 { 3770 if (value) 3771 vmx_enable_intercept_for_msr(msr_bitmap, msr, type); 3772 else 3773 vmx_disable_intercept_for_msr(msr_bitmap, msr, type); 3774 } 3775 3776 static u8 vmx_msr_bitmap_mode(struct kvm_vcpu *vcpu) 3777 { 3778 u8 mode = 0; 3779 3780 if (cpu_has_secondary_exec_ctrls() && 3781 (secondary_exec_controls_get(to_vmx(vcpu)) & 3782 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)) { 3783 mode |= MSR_BITMAP_MODE_X2APIC; 3784 if (enable_apicv && kvm_vcpu_apicv_active(vcpu)) 3785 mode |= MSR_BITMAP_MODE_X2APIC_APICV; 3786 } 3787 3788 return mode; 3789 } 3790 3791 static void vmx_update_msr_bitmap_x2apic(unsigned long *msr_bitmap, 3792 u8 mode) 3793 { 3794 int msr; 3795 3796 for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) { 3797 unsigned word = msr / BITS_PER_LONG; 3798 msr_bitmap[word] = (mode & MSR_BITMAP_MODE_X2APIC_APICV) ? 0 : ~0; 3799 msr_bitmap[word + (0x800 / sizeof(long))] = ~0; 3800 } 3801 3802 if (mode & MSR_BITMAP_MODE_X2APIC) { 3803 /* 3804 * TPR reads and writes can be virtualized even if virtual interrupt 3805 * delivery is not in use. 3806 */ 3807 vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TASKPRI), MSR_TYPE_RW); 3808 if (mode & MSR_BITMAP_MODE_X2APIC_APICV) { 3809 vmx_enable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TMCCT), MSR_TYPE_R); 3810 vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_EOI), MSR_TYPE_W); 3811 vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_SELF_IPI), MSR_TYPE_W); 3812 } 3813 } 3814 } 3815 3816 void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu) 3817 { 3818 struct vcpu_vmx *vmx = to_vmx(vcpu); 3819 unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap; 3820 u8 mode = vmx_msr_bitmap_mode(vcpu); 3821 u8 changed = mode ^ vmx->msr_bitmap_mode; 3822 3823 if (!changed) 3824 return; 3825 3826 if (changed & (MSR_BITMAP_MODE_X2APIC | MSR_BITMAP_MODE_X2APIC_APICV)) 3827 vmx_update_msr_bitmap_x2apic(msr_bitmap, mode); 3828 3829 vmx->msr_bitmap_mode = mode; 3830 } 3831 3832 void pt_update_intercept_for_msr(struct vcpu_vmx *vmx) 3833 { 3834 unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap; 3835 bool flag = !(vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN); 3836 u32 i; 3837 3838 vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_STATUS, 3839 MSR_TYPE_RW, flag); 3840 vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_BASE, 3841 MSR_TYPE_RW, flag); 3842 vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_MASK, 3843 MSR_TYPE_RW, flag); 3844 vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_CR3_MATCH, 3845 MSR_TYPE_RW, flag); 3846 for (i = 0; i < vmx->pt_desc.addr_range; i++) { 3847 vmx_set_intercept_for_msr(msr_bitmap, 3848 MSR_IA32_RTIT_ADDR0_A + i * 2, MSR_TYPE_RW, flag); 3849 vmx_set_intercept_for_msr(msr_bitmap, 3850 MSR_IA32_RTIT_ADDR0_B + i * 2, MSR_TYPE_RW, flag); 3851 } 3852 } 3853 3854 static bool vmx_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) 3855 { 3856 struct vcpu_vmx *vmx = to_vmx(vcpu); 3857 void *vapic_page; 3858 u32 vppr; 3859 int rvi; 3860 3861 if (WARN_ON_ONCE(!is_guest_mode(vcpu)) || 3862 !nested_cpu_has_vid(get_vmcs12(vcpu)) || 3863 WARN_ON_ONCE(!vmx->nested.virtual_apic_map.gfn)) 3864 return false; 3865 3866 rvi = vmx_get_rvi(); 3867 3868 vapic_page = vmx->nested.virtual_apic_map.hva; 3869 vppr = *((u32 *)(vapic_page + APIC_PROCPRI)); 3870 3871 return ((rvi & 0xf0) > (vppr & 0xf0)); 3872 } 3873 3874 static inline bool kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu, 3875 bool nested) 3876 { 3877 #ifdef CONFIG_SMP 3878 int pi_vec = nested ? POSTED_INTR_NESTED_VECTOR : POSTED_INTR_VECTOR; 3879 3880 if (vcpu->mode == IN_GUEST_MODE) { 3881 /* 3882 * The vector of interrupt to be delivered to vcpu had 3883 * been set in PIR before this function. 3884 * 3885 * Following cases will be reached in this block, and 3886 * we always send a notification event in all cases as 3887 * explained below. 3888 * 3889 * Case 1: vcpu keeps in non-root mode. Sending a 3890 * notification event posts the interrupt to vcpu. 3891 * 3892 * Case 2: vcpu exits to root mode and is still 3893 * runnable. PIR will be synced to vIRR before the 3894 * next vcpu entry. Sending a notification event in 3895 * this case has no effect, as vcpu is not in root 3896 * mode. 3897 * 3898 * Case 3: vcpu exits to root mode and is blocked. 3899 * vcpu_block() has already synced PIR to vIRR and 3900 * never blocks vcpu if vIRR is not cleared. Therefore, 3901 * a blocked vcpu here does not wait for any requested 3902 * interrupts in PIR, and sending a notification event 3903 * which has no effect is safe here. 3904 */ 3905 3906 apic->send_IPI_mask(get_cpu_mask(vcpu->cpu), pi_vec); 3907 return true; 3908 } 3909 #endif 3910 return false; 3911 } 3912 3913 static int vmx_deliver_nested_posted_interrupt(struct kvm_vcpu *vcpu, 3914 int vector) 3915 { 3916 struct vcpu_vmx *vmx = to_vmx(vcpu); 3917 3918 if (is_guest_mode(vcpu) && 3919 vector == vmx->nested.posted_intr_nv) { 3920 /* 3921 * If a posted intr is not recognized by hardware, 3922 * we will accomplish it in the next vmentry. 3923 */ 3924 vmx->nested.pi_pending = true; 3925 kvm_make_request(KVM_REQ_EVENT, vcpu); 3926 /* the PIR and ON have been set by L1. */ 3927 if (!kvm_vcpu_trigger_posted_interrupt(vcpu, true)) 3928 kvm_vcpu_kick(vcpu); 3929 return 0; 3930 } 3931 return -1; 3932 } 3933 /* 3934 * Send interrupt to vcpu via posted interrupt way. 3935 * 1. If target vcpu is running(non-root mode), send posted interrupt 3936 * notification to vcpu and hardware will sync PIR to vIRR atomically. 3937 * 2. If target vcpu isn't running(root mode), kick it to pick up the 3938 * interrupt from PIR in next vmentry. 3939 */ 3940 static int vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector) 3941 { 3942 struct vcpu_vmx *vmx = to_vmx(vcpu); 3943 int r; 3944 3945 r = vmx_deliver_nested_posted_interrupt(vcpu, vector); 3946 if (!r) 3947 return 0; 3948 3949 if (!vcpu->arch.apicv_active) 3950 return -1; 3951 3952 if (pi_test_and_set_pir(vector, &vmx->pi_desc)) 3953 return 0; 3954 3955 /* If a previous notification has sent the IPI, nothing to do. */ 3956 if (pi_test_and_set_on(&vmx->pi_desc)) 3957 return 0; 3958 3959 if (vcpu != kvm_get_running_vcpu() && 3960 !kvm_vcpu_trigger_posted_interrupt(vcpu, false)) 3961 kvm_vcpu_kick(vcpu); 3962 3963 return 0; 3964 } 3965 3966 /* 3967 * Set up the vmcs's constant host-state fields, i.e., host-state fields that 3968 * will not change in the lifetime of the guest. 3969 * Note that host-state that does change is set elsewhere. E.g., host-state 3970 * that is set differently for each CPU is set in vmx_vcpu_load(), not here. 3971 */ 3972 void vmx_set_constant_host_state(struct vcpu_vmx *vmx) 3973 { 3974 u32 low32, high32; 3975 unsigned long tmpl; 3976 unsigned long cr0, cr3, cr4; 3977 3978 cr0 = read_cr0(); 3979 WARN_ON(cr0 & X86_CR0_TS); 3980 vmcs_writel(HOST_CR0, cr0); /* 22.2.3 */ 3981 3982 /* 3983 * Save the most likely value for this task's CR3 in the VMCS. 3984 * We can't use __get_current_cr3_fast() because we're not atomic. 3985 */ 3986 cr3 = __read_cr3(); 3987 vmcs_writel(HOST_CR3, cr3); /* 22.2.3 FIXME: shadow tables */ 3988 vmx->loaded_vmcs->host_state.cr3 = cr3; 3989 3990 /* Save the most likely value for this task's CR4 in the VMCS. */ 3991 cr4 = cr4_read_shadow(); 3992 vmcs_writel(HOST_CR4, cr4); /* 22.2.3, 22.2.5 */ 3993 vmx->loaded_vmcs->host_state.cr4 = cr4; 3994 3995 vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ 3996 #ifdef CONFIG_X86_64 3997 /* 3998 * Load null selectors, so we can avoid reloading them in 3999 * vmx_prepare_switch_to_host(), in case userspace uses 4000 * the null selectors too (the expected case). 4001 */ 4002 vmcs_write16(HOST_DS_SELECTOR, 0); 4003 vmcs_write16(HOST_ES_SELECTOR, 0); 4004 #else 4005 vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ 4006 vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ 4007 #endif 4008 vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ 4009 vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ 4010 4011 vmcs_writel(HOST_IDTR_BASE, host_idt_base); /* 22.2.4 */ 4012 4013 vmcs_writel(HOST_RIP, (unsigned long)vmx_vmexit); /* 22.2.5 */ 4014 4015 rdmsr(MSR_IA32_SYSENTER_CS, low32, high32); 4016 vmcs_write32(HOST_IA32_SYSENTER_CS, low32); 4017 rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl); 4018 vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl); /* 22.2.3 */ 4019 4020 if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { 4021 rdmsr(MSR_IA32_CR_PAT, low32, high32); 4022 vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32)); 4023 } 4024 4025 if (cpu_has_load_ia32_efer()) 4026 vmcs_write64(HOST_IA32_EFER, host_efer); 4027 } 4028 4029 void set_cr4_guest_host_mask(struct vcpu_vmx *vmx) 4030 { 4031 vmx->vcpu.arch.cr4_guest_owned_bits = KVM_POSSIBLE_CR4_GUEST_BITS; 4032 if (!enable_ept) 4033 vmx->vcpu.arch.cr4_guest_owned_bits &= ~X86_CR4_PGE; 4034 if (is_guest_mode(&vmx->vcpu)) 4035 vmx->vcpu.arch.cr4_guest_owned_bits &= 4036 ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask; 4037 vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits); 4038 } 4039 4040 u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx) 4041 { 4042 u32 pin_based_exec_ctrl = vmcs_config.pin_based_exec_ctrl; 4043 4044 if (!kvm_vcpu_apicv_active(&vmx->vcpu)) 4045 pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR; 4046 4047 if (!enable_vnmi) 4048 pin_based_exec_ctrl &= ~PIN_BASED_VIRTUAL_NMIS; 4049 4050 if (!enable_preemption_timer) 4051 pin_based_exec_ctrl &= ~PIN_BASED_VMX_PREEMPTION_TIMER; 4052 4053 return pin_based_exec_ctrl; 4054 } 4055 4056 static void vmx_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu) 4057 { 4058 struct vcpu_vmx *vmx = to_vmx(vcpu); 4059 4060 pin_controls_set(vmx, vmx_pin_based_exec_ctrl(vmx)); 4061 if (cpu_has_secondary_exec_ctrls()) { 4062 if (kvm_vcpu_apicv_active(vcpu)) 4063 secondary_exec_controls_setbit(vmx, 4064 SECONDARY_EXEC_APIC_REGISTER_VIRT | 4065 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); 4066 else 4067 secondary_exec_controls_clearbit(vmx, 4068 SECONDARY_EXEC_APIC_REGISTER_VIRT | 4069 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); 4070 } 4071 4072 if (cpu_has_vmx_msr_bitmap()) 4073 vmx_update_msr_bitmap(vcpu); 4074 } 4075 4076 u32 vmx_exec_control(struct vcpu_vmx *vmx) 4077 { 4078 u32 exec_control = vmcs_config.cpu_based_exec_ctrl; 4079 4080 if (vmx->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT) 4081 exec_control &= ~CPU_BASED_MOV_DR_EXITING; 4082 4083 if (!cpu_need_tpr_shadow(&vmx->vcpu)) { 4084 exec_control &= ~CPU_BASED_TPR_SHADOW; 4085 #ifdef CONFIG_X86_64 4086 exec_control |= CPU_BASED_CR8_STORE_EXITING | 4087 CPU_BASED_CR8_LOAD_EXITING; 4088 #endif 4089 } 4090 if (!enable_ept) 4091 exec_control |= CPU_BASED_CR3_STORE_EXITING | 4092 CPU_BASED_CR3_LOAD_EXITING | 4093 CPU_BASED_INVLPG_EXITING; 4094 if (kvm_mwait_in_guest(vmx->vcpu.kvm)) 4095 exec_control &= ~(CPU_BASED_MWAIT_EXITING | 4096 CPU_BASED_MONITOR_EXITING); 4097 if (kvm_hlt_in_guest(vmx->vcpu.kvm)) 4098 exec_control &= ~CPU_BASED_HLT_EXITING; 4099 return exec_control; 4100 } 4101 4102 4103 static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx) 4104 { 4105 struct kvm_vcpu *vcpu = &vmx->vcpu; 4106 4107 u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; 4108 4109 if (vmx_pt_mode_is_system()) 4110 exec_control &= ~(SECONDARY_EXEC_PT_USE_GPA | SECONDARY_EXEC_PT_CONCEAL_VMX); 4111 if (!cpu_need_virtualize_apic_accesses(vcpu)) 4112 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; 4113 if (vmx->vpid == 0) 4114 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; 4115 if (!enable_ept) { 4116 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; 4117 enable_unrestricted_guest = 0; 4118 } 4119 if (!enable_unrestricted_guest) 4120 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; 4121 if (kvm_pause_in_guest(vmx->vcpu.kvm)) 4122 exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; 4123 if (!kvm_vcpu_apicv_active(vcpu)) 4124 exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT | 4125 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); 4126 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; 4127 4128 /* SECONDARY_EXEC_DESC is enabled/disabled on writes to CR4.UMIP, 4129 * in vmx_set_cr4. */ 4130 exec_control &= ~SECONDARY_EXEC_DESC; 4131 4132 /* SECONDARY_EXEC_SHADOW_VMCS is enabled when L1 executes VMPTRLD 4133 (handle_vmptrld). 4134 We can NOT enable shadow_vmcs here because we don't have yet 4135 a current VMCS12 4136 */ 4137 exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS; 4138 4139 if (!enable_pml) 4140 exec_control &= ~SECONDARY_EXEC_ENABLE_PML; 4141 4142 if (vmx_xsaves_supported()) { 4143 /* Exposing XSAVES only when XSAVE is exposed */ 4144 bool xsaves_enabled = 4145 boot_cpu_has(X86_FEATURE_XSAVE) && 4146 guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && 4147 guest_cpuid_has(vcpu, X86_FEATURE_XSAVES); 4148 4149 vcpu->arch.xsaves_enabled = xsaves_enabled; 4150 4151 if (!xsaves_enabled) 4152 exec_control &= ~SECONDARY_EXEC_XSAVES; 4153 4154 if (nested) { 4155 if (xsaves_enabled) 4156 vmx->nested.msrs.secondary_ctls_high |= 4157 SECONDARY_EXEC_XSAVES; 4158 else 4159 vmx->nested.msrs.secondary_ctls_high &= 4160 ~SECONDARY_EXEC_XSAVES; 4161 } 4162 } 4163 4164 if (cpu_has_vmx_rdtscp()) { 4165 bool rdtscp_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP); 4166 if (!rdtscp_enabled) 4167 exec_control &= ~SECONDARY_EXEC_RDTSCP; 4168 4169 if (nested) { 4170 if (rdtscp_enabled) 4171 vmx->nested.msrs.secondary_ctls_high |= 4172 SECONDARY_EXEC_RDTSCP; 4173 else 4174 vmx->nested.msrs.secondary_ctls_high &= 4175 ~SECONDARY_EXEC_RDTSCP; 4176 } 4177 } 4178 4179 if (cpu_has_vmx_invpcid()) { 4180 /* Exposing INVPCID only when PCID is exposed */ 4181 bool invpcid_enabled = 4182 guest_cpuid_has(vcpu, X86_FEATURE_INVPCID) && 4183 guest_cpuid_has(vcpu, X86_FEATURE_PCID); 4184 4185 if (!invpcid_enabled) { 4186 exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID; 4187 guest_cpuid_clear(vcpu, X86_FEATURE_INVPCID); 4188 } 4189 4190 if (nested) { 4191 if (invpcid_enabled) 4192 vmx->nested.msrs.secondary_ctls_high |= 4193 SECONDARY_EXEC_ENABLE_INVPCID; 4194 else 4195 vmx->nested.msrs.secondary_ctls_high &= 4196 ~SECONDARY_EXEC_ENABLE_INVPCID; 4197 } 4198 } 4199 4200 if (vmx_rdrand_supported()) { 4201 bool rdrand_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDRAND); 4202 if (rdrand_enabled) 4203 exec_control &= ~SECONDARY_EXEC_RDRAND_EXITING; 4204 4205 if (nested) { 4206 if (rdrand_enabled) 4207 vmx->nested.msrs.secondary_ctls_high |= 4208 SECONDARY_EXEC_RDRAND_EXITING; 4209 else 4210 vmx->nested.msrs.secondary_ctls_high &= 4211 ~SECONDARY_EXEC_RDRAND_EXITING; 4212 } 4213 } 4214 4215 if (vmx_rdseed_supported()) { 4216 bool rdseed_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDSEED); 4217 if (rdseed_enabled) 4218 exec_control &= ~SECONDARY_EXEC_RDSEED_EXITING; 4219 4220 if (nested) { 4221 if (rdseed_enabled) 4222 vmx->nested.msrs.secondary_ctls_high |= 4223 SECONDARY_EXEC_RDSEED_EXITING; 4224 else 4225 vmx->nested.msrs.secondary_ctls_high &= 4226 ~SECONDARY_EXEC_RDSEED_EXITING; 4227 } 4228 } 4229 4230 if (vmx_waitpkg_supported()) { 4231 bool waitpkg_enabled = 4232 guest_cpuid_has(vcpu, X86_FEATURE_WAITPKG); 4233 4234 if (!waitpkg_enabled) 4235 exec_control &= ~SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE; 4236 4237 if (nested) { 4238 if (waitpkg_enabled) 4239 vmx->nested.msrs.secondary_ctls_high |= 4240 SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE; 4241 else 4242 vmx->nested.msrs.secondary_ctls_high &= 4243 ~SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE; 4244 } 4245 } 4246 4247 vmx->secondary_exec_control = exec_control; 4248 } 4249 4250 static void ept_set_mmio_spte_mask(void) 4251 { 4252 /* 4253 * EPT Misconfigurations can be generated if the value of bits 2:0 4254 * of an EPT paging-structure entry is 110b (write/execute). 4255 */ 4256 kvm_mmu_set_mmio_spte_mask(VMX_EPT_MISCONFIG_WX_VALUE, 0); 4257 } 4258 4259 #define VMX_XSS_EXIT_BITMAP 0 4260 4261 /* 4262 * Noting that the initialization of Guest-state Area of VMCS is in 4263 * vmx_vcpu_reset(). 4264 */ 4265 static void init_vmcs(struct vcpu_vmx *vmx) 4266 { 4267 if (nested) 4268 nested_vmx_set_vmcs_shadowing_bitmap(); 4269 4270 if (cpu_has_vmx_msr_bitmap()) 4271 vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap)); 4272 4273 vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ 4274 4275 /* Control */ 4276 pin_controls_set(vmx, vmx_pin_based_exec_ctrl(vmx)); 4277 4278 exec_controls_set(vmx, vmx_exec_control(vmx)); 4279 4280 if (cpu_has_secondary_exec_ctrls()) { 4281 vmx_compute_secondary_exec_control(vmx); 4282 secondary_exec_controls_set(vmx, vmx->secondary_exec_control); 4283 } 4284 4285 if (kvm_vcpu_apicv_active(&vmx->vcpu)) { 4286 vmcs_write64(EOI_EXIT_BITMAP0, 0); 4287 vmcs_write64(EOI_EXIT_BITMAP1, 0); 4288 vmcs_write64(EOI_EXIT_BITMAP2, 0); 4289 vmcs_write64(EOI_EXIT_BITMAP3, 0); 4290 4291 vmcs_write16(GUEST_INTR_STATUS, 0); 4292 4293 vmcs_write16(POSTED_INTR_NV, POSTED_INTR_VECTOR); 4294 vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc))); 4295 } 4296 4297 if (!kvm_pause_in_guest(vmx->vcpu.kvm)) { 4298 vmcs_write32(PLE_GAP, ple_gap); 4299 vmx->ple_window = ple_window; 4300 vmx->ple_window_dirty = true; 4301 } 4302 4303 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); 4304 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); 4305 vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ 4306 4307 vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */ 4308 vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */ 4309 vmx_set_constant_host_state(vmx); 4310 vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ 4311 vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ 4312 4313 if (cpu_has_vmx_vmfunc()) 4314 vmcs_write64(VM_FUNCTION_CONTROL, 0); 4315 4316 vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); 4317 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); 4318 vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host.val)); 4319 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); 4320 vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest.val)); 4321 4322 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) 4323 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); 4324 4325 vm_exit_controls_set(vmx, vmx_vmexit_ctrl()); 4326 4327 /* 22.2.1, 20.8.1 */ 4328 vm_entry_controls_set(vmx, vmx_vmentry_ctrl()); 4329 4330 vmx->vcpu.arch.cr0_guest_owned_bits = KVM_POSSIBLE_CR0_GUEST_BITS; 4331 vmcs_writel(CR0_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr0_guest_owned_bits); 4332 4333 set_cr4_guest_host_mask(vmx); 4334 4335 if (vmx->vpid != 0) 4336 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); 4337 4338 if (vmx_xsaves_supported()) 4339 vmcs_write64(XSS_EXIT_BITMAP, VMX_XSS_EXIT_BITMAP); 4340 4341 if (enable_pml) { 4342 vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg)); 4343 vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); 4344 } 4345 4346 if (cpu_has_vmx_encls_vmexit()) 4347 vmcs_write64(ENCLS_EXITING_BITMAP, -1ull); 4348 4349 if (vmx_pt_mode_is_host_guest()) { 4350 memset(&vmx->pt_desc, 0, sizeof(vmx->pt_desc)); 4351 /* Bit[6~0] are forced to 1, writes are ignored. */ 4352 vmx->pt_desc.guest.output_mask = 0x7F; 4353 vmcs_write64(GUEST_IA32_RTIT_CTL, 0); 4354 } 4355 4356 /* 4357 * If EPT is enabled, #PF is only trapped if MAXPHYADDR is mismatched 4358 * between guest and host. In that case we only care about present 4359 * faults. 4360 */ 4361 if (enable_ept) { 4362 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, PFERR_PRESENT_MASK); 4363 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, PFERR_PRESENT_MASK); 4364 } 4365 } 4366 4367 static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) 4368 { 4369 struct vcpu_vmx *vmx = to_vmx(vcpu); 4370 struct msr_data apic_base_msr; 4371 u64 cr0; 4372 4373 vmx->rmode.vm86_active = 0; 4374 vmx->spec_ctrl = 0; 4375 4376 vmx->msr_ia32_umwait_control = 0; 4377 4378 vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); 4379 vmx->hv_deadline_tsc = -1; 4380 kvm_set_cr8(vcpu, 0); 4381 4382 if (!init_event) { 4383 apic_base_msr.data = APIC_DEFAULT_PHYS_BASE | 4384 MSR_IA32_APICBASE_ENABLE; 4385 if (kvm_vcpu_is_reset_bsp(vcpu)) 4386 apic_base_msr.data |= MSR_IA32_APICBASE_BSP; 4387 apic_base_msr.host_initiated = true; 4388 kvm_set_apic_base(vcpu, &apic_base_msr); 4389 } 4390 4391 vmx_segment_cache_clear(vmx); 4392 4393 seg_setup(VCPU_SREG_CS); 4394 vmcs_write16(GUEST_CS_SELECTOR, 0xf000); 4395 vmcs_writel(GUEST_CS_BASE, 0xffff0000ul); 4396 4397 seg_setup(VCPU_SREG_DS); 4398 seg_setup(VCPU_SREG_ES); 4399 seg_setup(VCPU_SREG_FS); 4400 seg_setup(VCPU_SREG_GS); 4401 seg_setup(VCPU_SREG_SS); 4402 4403 vmcs_write16(GUEST_TR_SELECTOR, 0); 4404 vmcs_writel(GUEST_TR_BASE, 0); 4405 vmcs_write32(GUEST_TR_LIMIT, 0xffff); 4406 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); 4407 4408 vmcs_write16(GUEST_LDTR_SELECTOR, 0); 4409 vmcs_writel(GUEST_LDTR_BASE, 0); 4410 vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); 4411 vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); 4412 4413 if (!init_event) { 4414 vmcs_write32(GUEST_SYSENTER_CS, 0); 4415 vmcs_writel(GUEST_SYSENTER_ESP, 0); 4416 vmcs_writel(GUEST_SYSENTER_EIP, 0); 4417 vmcs_write64(GUEST_IA32_DEBUGCTL, 0); 4418 } 4419 4420 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); 4421 kvm_rip_write(vcpu, 0xfff0); 4422 4423 vmcs_writel(GUEST_GDTR_BASE, 0); 4424 vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); 4425 4426 vmcs_writel(GUEST_IDTR_BASE, 0); 4427 vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); 4428 4429 vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); 4430 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); 4431 vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, 0); 4432 if (kvm_mpx_supported()) 4433 vmcs_write64(GUEST_BNDCFGS, 0); 4434 4435 setup_msrs(vmx); 4436 4437 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ 4438 4439 if (cpu_has_vmx_tpr_shadow() && !init_event) { 4440 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); 4441 if (cpu_need_tpr_shadow(vcpu)) 4442 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 4443 __pa(vcpu->arch.apic->regs)); 4444 vmcs_write32(TPR_THRESHOLD, 0); 4445 } 4446 4447 kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); 4448 4449 cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; 4450 vmx->vcpu.arch.cr0 = cr0; 4451 vmx_set_cr0(vcpu, cr0); /* enter rmode */ 4452 vmx_set_cr4(vcpu, 0); 4453 vmx_set_efer(vcpu, 0); 4454 4455 update_exception_bitmap(vcpu); 4456 4457 vpid_sync_context(vmx->vpid); 4458 if (init_event) 4459 vmx_clear_hlt(vcpu); 4460 } 4461 4462 static void enable_irq_window(struct kvm_vcpu *vcpu) 4463 { 4464 exec_controls_setbit(to_vmx(vcpu), CPU_BASED_INTR_WINDOW_EXITING); 4465 } 4466 4467 static void enable_nmi_window(struct kvm_vcpu *vcpu) 4468 { 4469 if (!enable_vnmi || 4470 vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) { 4471 enable_irq_window(vcpu); 4472 return; 4473 } 4474 4475 exec_controls_setbit(to_vmx(vcpu), CPU_BASED_NMI_WINDOW_EXITING); 4476 } 4477 4478 static void vmx_inject_irq(struct kvm_vcpu *vcpu) 4479 { 4480 struct vcpu_vmx *vmx = to_vmx(vcpu); 4481 uint32_t intr; 4482 int irq = vcpu->arch.interrupt.nr; 4483 4484 trace_kvm_inj_virq(irq); 4485 4486 ++vcpu->stat.irq_injections; 4487 if (vmx->rmode.vm86_active) { 4488 int inc_eip = 0; 4489 if (vcpu->arch.interrupt.soft) 4490 inc_eip = vcpu->arch.event_exit_inst_len; 4491 kvm_inject_realmode_interrupt(vcpu, irq, inc_eip); 4492 return; 4493 } 4494 intr = irq | INTR_INFO_VALID_MASK; 4495 if (vcpu->arch.interrupt.soft) { 4496 intr |= INTR_TYPE_SOFT_INTR; 4497 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 4498 vmx->vcpu.arch.event_exit_inst_len); 4499 } else 4500 intr |= INTR_TYPE_EXT_INTR; 4501 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); 4502 4503 vmx_clear_hlt(vcpu); 4504 } 4505 4506 static void vmx_inject_nmi(struct kvm_vcpu *vcpu) 4507 { 4508 struct vcpu_vmx *vmx = to_vmx(vcpu); 4509 4510 if (!enable_vnmi) { 4511 /* 4512 * Tracking the NMI-blocked state in software is built upon 4513 * finding the next open IRQ window. This, in turn, depends on 4514 * well-behaving guests: They have to keep IRQs disabled at 4515 * least as long as the NMI handler runs. Otherwise we may 4516 * cause NMI nesting, maybe breaking the guest. But as this is 4517 * highly unlikely, we can live with the residual risk. 4518 */ 4519 vmx->loaded_vmcs->soft_vnmi_blocked = 1; 4520 vmx->loaded_vmcs->vnmi_blocked_time = 0; 4521 } 4522 4523 ++vcpu->stat.nmi_injections; 4524 vmx->loaded_vmcs->nmi_known_unmasked = false; 4525 4526 if (vmx->rmode.vm86_active) { 4527 kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0); 4528 return; 4529 } 4530 4531 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 4532 INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); 4533 4534 vmx_clear_hlt(vcpu); 4535 } 4536 4537 bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) 4538 { 4539 struct vcpu_vmx *vmx = to_vmx(vcpu); 4540 bool masked; 4541 4542 if (!enable_vnmi) 4543 return vmx->loaded_vmcs->soft_vnmi_blocked; 4544 if (vmx->loaded_vmcs->nmi_known_unmasked) 4545 return false; 4546 masked = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI; 4547 vmx->loaded_vmcs->nmi_known_unmasked = !masked; 4548 return masked; 4549 } 4550 4551 void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) 4552 { 4553 struct vcpu_vmx *vmx = to_vmx(vcpu); 4554 4555 if (!enable_vnmi) { 4556 if (vmx->loaded_vmcs->soft_vnmi_blocked != masked) { 4557 vmx->loaded_vmcs->soft_vnmi_blocked = masked; 4558 vmx->loaded_vmcs->vnmi_blocked_time = 0; 4559 } 4560 } else { 4561 vmx->loaded_vmcs->nmi_known_unmasked = !masked; 4562 if (masked) 4563 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, 4564 GUEST_INTR_STATE_NMI); 4565 else 4566 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, 4567 GUEST_INTR_STATE_NMI); 4568 } 4569 } 4570 4571 bool vmx_nmi_blocked(struct kvm_vcpu *vcpu) 4572 { 4573 if (is_guest_mode(vcpu) && nested_exit_on_nmi(vcpu)) 4574 return false; 4575 4576 if (!enable_vnmi && to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked) 4577 return true; 4578 4579 return (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 4580 (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI | 4581 GUEST_INTR_STATE_NMI)); 4582 } 4583 4584 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu, bool for_injection) 4585 { 4586 if (to_vmx(vcpu)->nested.nested_run_pending) 4587 return -EBUSY; 4588 4589 /* An NMI must not be injected into L2 if it's supposed to VM-Exit. */ 4590 if (for_injection && is_guest_mode(vcpu) && nested_exit_on_nmi(vcpu)) 4591 return -EBUSY; 4592 4593 return !vmx_nmi_blocked(vcpu); 4594 } 4595 4596 bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu) 4597 { 4598 if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) 4599 return false; 4600 4601 return !(vmx_get_rflags(vcpu) & X86_EFLAGS_IF) || 4602 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 4603 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); 4604 } 4605 4606 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu, bool for_injection) 4607 { 4608 if (to_vmx(vcpu)->nested.nested_run_pending) 4609 return -EBUSY; 4610 4611 /* 4612 * An IRQ must not be injected into L2 if it's supposed to VM-Exit, 4613 * e.g. if the IRQ arrived asynchronously after checking nested events. 4614 */ 4615 if (for_injection && is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) 4616 return -EBUSY; 4617 4618 return !vmx_interrupt_blocked(vcpu); 4619 } 4620 4621 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) 4622 { 4623 int ret; 4624 4625 if (enable_unrestricted_guest) 4626 return 0; 4627 4628 mutex_lock(&kvm->slots_lock); 4629 ret = __x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr, 4630 PAGE_SIZE * 3); 4631 mutex_unlock(&kvm->slots_lock); 4632 4633 if (ret) 4634 return ret; 4635 to_kvm_vmx(kvm)->tss_addr = addr; 4636 return init_rmode_tss(kvm); 4637 } 4638 4639 static int vmx_set_identity_map_addr(struct kvm *kvm, u64 ident_addr) 4640 { 4641 to_kvm_vmx(kvm)->ept_identity_map_addr = ident_addr; 4642 return 0; 4643 } 4644 4645 static bool rmode_exception(struct kvm_vcpu *vcpu, int vec) 4646 { 4647 switch (vec) { 4648 case BP_VECTOR: 4649 /* 4650 * Update instruction length as we may reinject the exception 4651 * from user space while in guest debugging mode. 4652 */ 4653 to_vmx(vcpu)->vcpu.arch.event_exit_inst_len = 4654 vmcs_read32(VM_EXIT_INSTRUCTION_LEN); 4655 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) 4656 return false; 4657 /* fall through */ 4658 case DB_VECTOR: 4659 return !(vcpu->guest_debug & 4660 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)); 4661 case DE_VECTOR: 4662 case OF_VECTOR: 4663 case BR_VECTOR: 4664 case UD_VECTOR: 4665 case DF_VECTOR: 4666 case SS_VECTOR: 4667 case GP_VECTOR: 4668 case MF_VECTOR: 4669 return true; 4670 } 4671 return false; 4672 } 4673 4674 static int handle_rmode_exception(struct kvm_vcpu *vcpu, 4675 int vec, u32 err_code) 4676 { 4677 /* 4678 * Instruction with address size override prefix opcode 0x67 4679 * Cause the #SS fault with 0 error code in VM86 mode. 4680 */ 4681 if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) { 4682 if (kvm_emulate_instruction(vcpu, 0)) { 4683 if (vcpu->arch.halt_request) { 4684 vcpu->arch.halt_request = 0; 4685 return kvm_vcpu_halt(vcpu); 4686 } 4687 return 1; 4688 } 4689 return 0; 4690 } 4691 4692 /* 4693 * Forward all other exceptions that are valid in real mode. 4694 * FIXME: Breaks guest debugging in real mode, needs to be fixed with 4695 * the required debugging infrastructure rework. 4696 */ 4697 kvm_queue_exception(vcpu, vec); 4698 return 1; 4699 } 4700 4701 /* 4702 * Trigger machine check on the host. We assume all the MSRs are already set up 4703 * by the CPU and that we still run on the same CPU as the MCE occurred on. 4704 * We pass a fake environment to the machine check handler because we want 4705 * the guest to be always treated like user space, no matter what context 4706 * it used internally. 4707 */ 4708 static void kvm_machine_check(void) 4709 { 4710 #if defined(CONFIG_X86_MCE) 4711 struct pt_regs regs = { 4712 .cs = 3, /* Fake ring 3 no matter what the guest ran on */ 4713 .flags = X86_EFLAGS_IF, 4714 }; 4715 4716 do_machine_check(®s); 4717 #endif 4718 } 4719 4720 static int handle_machine_check(struct kvm_vcpu *vcpu) 4721 { 4722 /* handled by vmx_vcpu_run() */ 4723 return 1; 4724 } 4725 4726 /* 4727 * If the host has split lock detection disabled, then #AC is 4728 * unconditionally injected into the guest, which is the pre split lock 4729 * detection behaviour. 4730 * 4731 * If the host has split lock detection enabled then #AC is 4732 * only injected into the guest when: 4733 * - Guest CPL == 3 (user mode) 4734 * - Guest has #AC detection enabled in CR0 4735 * - Guest EFLAGS has AC bit set 4736 */ 4737 static inline bool guest_inject_ac(struct kvm_vcpu *vcpu) 4738 { 4739 if (!boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT)) 4740 return true; 4741 4742 return vmx_get_cpl(vcpu) == 3 && kvm_read_cr0_bits(vcpu, X86_CR0_AM) && 4743 (kvm_get_rflags(vcpu) & X86_EFLAGS_AC); 4744 } 4745 4746 static int handle_exception_nmi(struct kvm_vcpu *vcpu) 4747 { 4748 struct vcpu_vmx *vmx = to_vmx(vcpu); 4749 struct kvm_run *kvm_run = vcpu->run; 4750 u32 intr_info, ex_no, error_code; 4751 unsigned long cr2, rip, dr6; 4752 u32 vect_info; 4753 4754 vect_info = vmx->idt_vectoring_info; 4755 intr_info = vmx_get_intr_info(vcpu); 4756 4757 if (is_machine_check(intr_info) || is_nmi(intr_info)) 4758 return 1; /* handled by handle_exception_nmi_irqoff() */ 4759 4760 if (is_invalid_opcode(intr_info)) 4761 return handle_ud(vcpu); 4762 4763 error_code = 0; 4764 if (intr_info & INTR_INFO_DELIVER_CODE_MASK) 4765 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); 4766 4767 if (!vmx->rmode.vm86_active && is_gp_fault(intr_info)) { 4768 WARN_ON_ONCE(!enable_vmware_backdoor); 4769 4770 /* 4771 * VMware backdoor emulation on #GP interception only handles 4772 * IN{S}, OUT{S}, and RDPMC, none of which generate a non-zero 4773 * error code on #GP. 4774 */ 4775 if (error_code) { 4776 kvm_queue_exception_e(vcpu, GP_VECTOR, error_code); 4777 return 1; 4778 } 4779 return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP); 4780 } 4781 4782 /* 4783 * The #PF with PFEC.RSVD = 1 indicates the guest is accessing 4784 * MMIO, it is better to report an internal error. 4785 * See the comments in vmx_handle_exit. 4786 */ 4787 if ((vect_info & VECTORING_INFO_VALID_MASK) && 4788 !(is_page_fault(intr_info) && !(error_code & PFERR_RSVD_MASK))) { 4789 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 4790 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; 4791 vcpu->run->internal.ndata = 4; 4792 vcpu->run->internal.data[0] = vect_info; 4793 vcpu->run->internal.data[1] = intr_info; 4794 vcpu->run->internal.data[2] = error_code; 4795 vcpu->run->internal.data[3] = vcpu->arch.last_vmentry_cpu; 4796 return 0; 4797 } 4798 4799 if (is_page_fault(intr_info)) { 4800 cr2 = vmx_get_exit_qual(vcpu); 4801 if (enable_ept && !vcpu->arch.apf.host_apf_flags) { 4802 /* 4803 * EPT will cause page fault only if we need to 4804 * detect illegal GPAs. 4805 */ 4806 kvm_fixup_and_inject_pf_error(vcpu, cr2, error_code); 4807 return 1; 4808 } else 4809 return kvm_handle_page_fault(vcpu, error_code, cr2, NULL, 0); 4810 } 4811 4812 ex_no = intr_info & INTR_INFO_VECTOR_MASK; 4813 4814 if (vmx->rmode.vm86_active && rmode_exception(vcpu, ex_no)) 4815 return handle_rmode_exception(vcpu, ex_no, error_code); 4816 4817 switch (ex_no) { 4818 case DB_VECTOR: 4819 dr6 = vmx_get_exit_qual(vcpu); 4820 if (!(vcpu->guest_debug & 4821 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { 4822 if (is_icebp(intr_info)) 4823 WARN_ON(!skip_emulated_instruction(vcpu)); 4824 4825 kvm_queue_exception_p(vcpu, DB_VECTOR, dr6); 4826 return 1; 4827 } 4828 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM; 4829 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); 4830 /* fall through */ 4831 case BP_VECTOR: 4832 /* 4833 * Update instruction length as we may reinject #BP from 4834 * user space while in guest debugging mode. Reading it for 4835 * #DB as well causes no harm, it is not used in that case. 4836 */ 4837 vmx->vcpu.arch.event_exit_inst_len = 4838 vmcs_read32(VM_EXIT_INSTRUCTION_LEN); 4839 kvm_run->exit_reason = KVM_EXIT_DEBUG; 4840 rip = kvm_rip_read(vcpu); 4841 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; 4842 kvm_run->debug.arch.exception = ex_no; 4843 break; 4844 case AC_VECTOR: 4845 if (guest_inject_ac(vcpu)) { 4846 kvm_queue_exception_e(vcpu, AC_VECTOR, error_code); 4847 return 1; 4848 } 4849 4850 /* 4851 * Handle split lock. Depending on detection mode this will 4852 * either warn and disable split lock detection for this 4853 * task or force SIGBUS on it. 4854 */ 4855 if (handle_guest_split_lock(kvm_rip_read(vcpu))) 4856 return 1; 4857 fallthrough; 4858 default: 4859 kvm_run->exit_reason = KVM_EXIT_EXCEPTION; 4860 kvm_run->ex.exception = ex_no; 4861 kvm_run->ex.error_code = error_code; 4862 break; 4863 } 4864 return 0; 4865 } 4866 4867 static __always_inline int handle_external_interrupt(struct kvm_vcpu *vcpu) 4868 { 4869 ++vcpu->stat.irq_exits; 4870 return 1; 4871 } 4872 4873 static int handle_triple_fault(struct kvm_vcpu *vcpu) 4874 { 4875 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; 4876 vcpu->mmio_needed = 0; 4877 return 0; 4878 } 4879 4880 static int handle_io(struct kvm_vcpu *vcpu) 4881 { 4882 unsigned long exit_qualification; 4883 int size, in, string; 4884 unsigned port; 4885 4886 exit_qualification = vmx_get_exit_qual(vcpu); 4887 string = (exit_qualification & 16) != 0; 4888 4889 ++vcpu->stat.io_exits; 4890 4891 if (string) 4892 return kvm_emulate_instruction(vcpu, 0); 4893 4894 port = exit_qualification >> 16; 4895 size = (exit_qualification & 7) + 1; 4896 in = (exit_qualification & 8) != 0; 4897 4898 return kvm_fast_pio(vcpu, size, port, in); 4899 } 4900 4901 static void 4902 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) 4903 { 4904 /* 4905 * Patch in the VMCALL instruction: 4906 */ 4907 hypercall[0] = 0x0f; 4908 hypercall[1] = 0x01; 4909 hypercall[2] = 0xc1; 4910 } 4911 4912 /* called to set cr0 as appropriate for a mov-to-cr0 exit. */ 4913 static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val) 4914 { 4915 if (is_guest_mode(vcpu)) { 4916 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 4917 unsigned long orig_val = val; 4918 4919 /* 4920 * We get here when L2 changed cr0 in a way that did not change 4921 * any of L1's shadowed bits (see nested_vmx_exit_handled_cr), 4922 * but did change L0 shadowed bits. So we first calculate the 4923 * effective cr0 value that L1 would like to write into the 4924 * hardware. It consists of the L2-owned bits from the new 4925 * value combined with the L1-owned bits from L1's guest_cr0. 4926 */ 4927 val = (val & ~vmcs12->cr0_guest_host_mask) | 4928 (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask); 4929 4930 if (!nested_guest_cr0_valid(vcpu, val)) 4931 return 1; 4932 4933 if (kvm_set_cr0(vcpu, val)) 4934 return 1; 4935 vmcs_writel(CR0_READ_SHADOW, orig_val); 4936 return 0; 4937 } else { 4938 if (to_vmx(vcpu)->nested.vmxon && 4939 !nested_host_cr0_valid(vcpu, val)) 4940 return 1; 4941 4942 return kvm_set_cr0(vcpu, val); 4943 } 4944 } 4945 4946 static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val) 4947 { 4948 if (is_guest_mode(vcpu)) { 4949 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 4950 unsigned long orig_val = val; 4951 4952 /* analogously to handle_set_cr0 */ 4953 val = (val & ~vmcs12->cr4_guest_host_mask) | 4954 (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask); 4955 if (kvm_set_cr4(vcpu, val)) 4956 return 1; 4957 vmcs_writel(CR4_READ_SHADOW, orig_val); 4958 return 0; 4959 } else 4960 return kvm_set_cr4(vcpu, val); 4961 } 4962 4963 static int handle_desc(struct kvm_vcpu *vcpu) 4964 { 4965 WARN_ON(!(vcpu->arch.cr4 & X86_CR4_UMIP)); 4966 return kvm_emulate_instruction(vcpu, 0); 4967 } 4968 4969 static int handle_cr(struct kvm_vcpu *vcpu) 4970 { 4971 unsigned long exit_qualification, val; 4972 int cr; 4973 int reg; 4974 int err; 4975 int ret; 4976 4977 exit_qualification = vmx_get_exit_qual(vcpu); 4978 cr = exit_qualification & 15; 4979 reg = (exit_qualification >> 8) & 15; 4980 switch ((exit_qualification >> 4) & 3) { 4981 case 0: /* mov to cr */ 4982 val = kvm_register_readl(vcpu, reg); 4983 trace_kvm_cr_write(cr, val); 4984 switch (cr) { 4985 case 0: 4986 err = handle_set_cr0(vcpu, val); 4987 return kvm_complete_insn_gp(vcpu, err); 4988 case 3: 4989 WARN_ON_ONCE(enable_unrestricted_guest); 4990 err = kvm_set_cr3(vcpu, val); 4991 return kvm_complete_insn_gp(vcpu, err); 4992 case 4: 4993 err = handle_set_cr4(vcpu, val); 4994 return kvm_complete_insn_gp(vcpu, err); 4995 case 8: { 4996 u8 cr8_prev = kvm_get_cr8(vcpu); 4997 u8 cr8 = (u8)val; 4998 err = kvm_set_cr8(vcpu, cr8); 4999 ret = kvm_complete_insn_gp(vcpu, err); 5000 if (lapic_in_kernel(vcpu)) 5001 return ret; 5002 if (cr8_prev <= cr8) 5003 return ret; 5004 /* 5005 * TODO: we might be squashing a 5006 * KVM_GUESTDBG_SINGLESTEP-triggered 5007 * KVM_EXIT_DEBUG here. 5008 */ 5009 vcpu->run->exit_reason = KVM_EXIT_SET_TPR; 5010 return 0; 5011 } 5012 } 5013 break; 5014 case 2: /* clts */ 5015 WARN_ONCE(1, "Guest should always own CR0.TS"); 5016 vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS)); 5017 trace_kvm_cr_write(0, kvm_read_cr0(vcpu)); 5018 return kvm_skip_emulated_instruction(vcpu); 5019 case 1: /*mov from cr*/ 5020 switch (cr) { 5021 case 3: 5022 WARN_ON_ONCE(enable_unrestricted_guest); 5023 val = kvm_read_cr3(vcpu); 5024 kvm_register_write(vcpu, reg, val); 5025 trace_kvm_cr_read(cr, val); 5026 return kvm_skip_emulated_instruction(vcpu); 5027 case 8: 5028 val = kvm_get_cr8(vcpu); 5029 kvm_register_write(vcpu, reg, val); 5030 trace_kvm_cr_read(cr, val); 5031 return kvm_skip_emulated_instruction(vcpu); 5032 } 5033 break; 5034 case 3: /* lmsw */ 5035 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; 5036 trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val); 5037 kvm_lmsw(vcpu, val); 5038 5039 return kvm_skip_emulated_instruction(vcpu); 5040 default: 5041 break; 5042 } 5043 vcpu->run->exit_reason = 0; 5044 vcpu_unimpl(vcpu, "unhandled control register: op %d cr %d\n", 5045 (int)(exit_qualification >> 4) & 3, cr); 5046 return 0; 5047 } 5048 5049 static int handle_dr(struct kvm_vcpu *vcpu) 5050 { 5051 unsigned long exit_qualification; 5052 int dr, dr7, reg; 5053 5054 exit_qualification = vmx_get_exit_qual(vcpu); 5055 dr = exit_qualification & DEBUG_REG_ACCESS_NUM; 5056 5057 /* First, if DR does not exist, trigger UD */ 5058 if (!kvm_require_dr(vcpu, dr)) 5059 return 1; 5060 5061 /* Do not handle if the CPL > 0, will trigger GP on re-entry */ 5062 if (!kvm_require_cpl(vcpu, 0)) 5063 return 1; 5064 dr7 = vmcs_readl(GUEST_DR7); 5065 if (dr7 & DR7_GD) { 5066 /* 5067 * As the vm-exit takes precedence over the debug trap, we 5068 * need to emulate the latter, either for the host or the 5069 * guest debugging itself. 5070 */ 5071 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { 5072 vcpu->run->debug.arch.dr6 = DR6_BD | DR6_RTM | DR6_FIXED_1; 5073 vcpu->run->debug.arch.dr7 = dr7; 5074 vcpu->run->debug.arch.pc = kvm_get_linear_rip(vcpu); 5075 vcpu->run->debug.arch.exception = DB_VECTOR; 5076 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 5077 return 0; 5078 } else { 5079 kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BD); 5080 return 1; 5081 } 5082 } 5083 5084 if (vcpu->guest_debug == 0) { 5085 exec_controls_clearbit(to_vmx(vcpu), CPU_BASED_MOV_DR_EXITING); 5086 5087 /* 5088 * No more DR vmexits; force a reload of the debug registers 5089 * and reenter on this instruction. The next vmexit will 5090 * retrieve the full state of the debug registers. 5091 */ 5092 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT; 5093 return 1; 5094 } 5095 5096 reg = DEBUG_REG_ACCESS_REG(exit_qualification); 5097 if (exit_qualification & TYPE_MOV_FROM_DR) { 5098 unsigned long val; 5099 5100 if (kvm_get_dr(vcpu, dr, &val)) 5101 return 1; 5102 kvm_register_write(vcpu, reg, val); 5103 } else 5104 if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg))) 5105 return 1; 5106 5107 return kvm_skip_emulated_instruction(vcpu); 5108 } 5109 5110 static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) 5111 { 5112 get_debugreg(vcpu->arch.db[0], 0); 5113 get_debugreg(vcpu->arch.db[1], 1); 5114 get_debugreg(vcpu->arch.db[2], 2); 5115 get_debugreg(vcpu->arch.db[3], 3); 5116 get_debugreg(vcpu->arch.dr6, 6); 5117 vcpu->arch.dr7 = vmcs_readl(GUEST_DR7); 5118 5119 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT; 5120 exec_controls_setbit(to_vmx(vcpu), CPU_BASED_MOV_DR_EXITING); 5121 } 5122 5123 static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val) 5124 { 5125 vmcs_writel(GUEST_DR7, val); 5126 } 5127 5128 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) 5129 { 5130 kvm_apic_update_ppr(vcpu); 5131 return 1; 5132 } 5133 5134 static int handle_interrupt_window(struct kvm_vcpu *vcpu) 5135 { 5136 exec_controls_clearbit(to_vmx(vcpu), CPU_BASED_INTR_WINDOW_EXITING); 5137 5138 kvm_make_request(KVM_REQ_EVENT, vcpu); 5139 5140 ++vcpu->stat.irq_window_exits; 5141 return 1; 5142 } 5143 5144 static int handle_vmcall(struct kvm_vcpu *vcpu) 5145 { 5146 return kvm_emulate_hypercall(vcpu); 5147 } 5148 5149 static int handle_invd(struct kvm_vcpu *vcpu) 5150 { 5151 return kvm_emulate_instruction(vcpu, 0); 5152 } 5153 5154 static int handle_invlpg(struct kvm_vcpu *vcpu) 5155 { 5156 unsigned long exit_qualification = vmx_get_exit_qual(vcpu); 5157 5158 kvm_mmu_invlpg(vcpu, exit_qualification); 5159 return kvm_skip_emulated_instruction(vcpu); 5160 } 5161 5162 static int handle_rdpmc(struct kvm_vcpu *vcpu) 5163 { 5164 int err; 5165 5166 err = kvm_rdpmc(vcpu); 5167 return kvm_complete_insn_gp(vcpu, err); 5168 } 5169 5170 static int handle_wbinvd(struct kvm_vcpu *vcpu) 5171 { 5172 return kvm_emulate_wbinvd(vcpu); 5173 } 5174 5175 static int handle_xsetbv(struct kvm_vcpu *vcpu) 5176 { 5177 u64 new_bv = kvm_read_edx_eax(vcpu); 5178 u32 index = kvm_rcx_read(vcpu); 5179 5180 if (kvm_set_xcr(vcpu, index, new_bv) == 0) 5181 return kvm_skip_emulated_instruction(vcpu); 5182 return 1; 5183 } 5184 5185 static int handle_apic_access(struct kvm_vcpu *vcpu) 5186 { 5187 if (likely(fasteoi)) { 5188 unsigned long exit_qualification = vmx_get_exit_qual(vcpu); 5189 int access_type, offset; 5190 5191 access_type = exit_qualification & APIC_ACCESS_TYPE; 5192 offset = exit_qualification & APIC_ACCESS_OFFSET; 5193 /* 5194 * Sane guest uses MOV to write EOI, with written value 5195 * not cared. So make a short-circuit here by avoiding 5196 * heavy instruction emulation. 5197 */ 5198 if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) && 5199 (offset == APIC_EOI)) { 5200 kvm_lapic_set_eoi(vcpu); 5201 return kvm_skip_emulated_instruction(vcpu); 5202 } 5203 } 5204 return kvm_emulate_instruction(vcpu, 0); 5205 } 5206 5207 static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu) 5208 { 5209 unsigned long exit_qualification = vmx_get_exit_qual(vcpu); 5210 int vector = exit_qualification & 0xff; 5211 5212 /* EOI-induced VM exit is trap-like and thus no need to adjust IP */ 5213 kvm_apic_set_eoi_accelerated(vcpu, vector); 5214 return 1; 5215 } 5216 5217 static int handle_apic_write(struct kvm_vcpu *vcpu) 5218 { 5219 unsigned long exit_qualification = vmx_get_exit_qual(vcpu); 5220 u32 offset = exit_qualification & 0xfff; 5221 5222 /* APIC-write VM exit is trap-like and thus no need to adjust IP */ 5223 kvm_apic_write_nodecode(vcpu, offset); 5224 return 1; 5225 } 5226 5227 static int handle_task_switch(struct kvm_vcpu *vcpu) 5228 { 5229 struct vcpu_vmx *vmx = to_vmx(vcpu); 5230 unsigned long exit_qualification; 5231 bool has_error_code = false; 5232 u32 error_code = 0; 5233 u16 tss_selector; 5234 int reason, type, idt_v, idt_index; 5235 5236 idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); 5237 idt_index = (vmx->idt_vectoring_info & VECTORING_INFO_VECTOR_MASK); 5238 type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); 5239 5240 exit_qualification = vmx_get_exit_qual(vcpu); 5241 5242 reason = (u32)exit_qualification >> 30; 5243 if (reason == TASK_SWITCH_GATE && idt_v) { 5244 switch (type) { 5245 case INTR_TYPE_NMI_INTR: 5246 vcpu->arch.nmi_injected = false; 5247 vmx_set_nmi_mask(vcpu, true); 5248 break; 5249 case INTR_TYPE_EXT_INTR: 5250 case INTR_TYPE_SOFT_INTR: 5251 kvm_clear_interrupt_queue(vcpu); 5252 break; 5253 case INTR_TYPE_HARD_EXCEPTION: 5254 if (vmx->idt_vectoring_info & 5255 VECTORING_INFO_DELIVER_CODE_MASK) { 5256 has_error_code = true; 5257 error_code = 5258 vmcs_read32(IDT_VECTORING_ERROR_CODE); 5259 } 5260 /* fall through */ 5261 case INTR_TYPE_SOFT_EXCEPTION: 5262 kvm_clear_exception_queue(vcpu); 5263 break; 5264 default: 5265 break; 5266 } 5267 } 5268 tss_selector = exit_qualification; 5269 5270 if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && 5271 type != INTR_TYPE_EXT_INTR && 5272 type != INTR_TYPE_NMI_INTR)) 5273 WARN_ON(!skip_emulated_instruction(vcpu)); 5274 5275 /* 5276 * TODO: What about debug traps on tss switch? 5277 * Are we supposed to inject them and update dr6? 5278 */ 5279 return kvm_task_switch(vcpu, tss_selector, 5280 type == INTR_TYPE_SOFT_INTR ? idt_index : -1, 5281 reason, has_error_code, error_code); 5282 } 5283 5284 static int handle_ept_violation(struct kvm_vcpu *vcpu) 5285 { 5286 unsigned long exit_qualification; 5287 gpa_t gpa; 5288 u64 error_code; 5289 5290 exit_qualification = vmx_get_exit_qual(vcpu); 5291 5292 /* 5293 * EPT violation happened while executing iret from NMI, 5294 * "blocked by NMI" bit has to be set before next VM entry. 5295 * There are errata that may cause this bit to not be set: 5296 * AAK134, BY25. 5297 */ 5298 if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) && 5299 enable_vnmi && 5300 (exit_qualification & INTR_INFO_UNBLOCK_NMI)) 5301 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); 5302 5303 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); 5304 trace_kvm_page_fault(gpa, exit_qualification); 5305 5306 /* Is it a read fault? */ 5307 error_code = (exit_qualification & EPT_VIOLATION_ACC_READ) 5308 ? PFERR_USER_MASK : 0; 5309 /* Is it a write fault? */ 5310 error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE) 5311 ? PFERR_WRITE_MASK : 0; 5312 /* Is it a fetch fault? */ 5313 error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR) 5314 ? PFERR_FETCH_MASK : 0; 5315 /* ept page table entry is present? */ 5316 error_code |= (exit_qualification & 5317 (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE | 5318 EPT_VIOLATION_EXECUTABLE)) 5319 ? PFERR_PRESENT_MASK : 0; 5320 5321 error_code |= (exit_qualification & 0x100) != 0 ? 5322 PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK; 5323 5324 vcpu->arch.exit_qualification = exit_qualification; 5325 5326 /* 5327 * Check that the GPA doesn't exceed physical memory limits, as that is 5328 * a guest page fault. We have to emulate the instruction here, because 5329 * if the illegal address is that of a paging structure, then 5330 * EPT_VIOLATION_ACC_WRITE bit is set. Alternatively, if supported we 5331 * would also use advanced VM-exit information for EPT violations to 5332 * reconstruct the page fault error code. 5333 */ 5334 if (unlikely(kvm_mmu_is_illegal_gpa(vcpu, gpa))) 5335 return kvm_emulate_instruction(vcpu, 0); 5336 5337 return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0); 5338 } 5339 5340 static int handle_ept_misconfig(struct kvm_vcpu *vcpu) 5341 { 5342 gpa_t gpa; 5343 5344 /* 5345 * A nested guest cannot optimize MMIO vmexits, because we have an 5346 * nGPA here instead of the required GPA. 5347 */ 5348 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); 5349 if (!is_guest_mode(vcpu) && 5350 !kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) { 5351 trace_kvm_fast_mmio(gpa); 5352 return kvm_skip_emulated_instruction(vcpu); 5353 } 5354 5355 return kvm_mmu_page_fault(vcpu, gpa, PFERR_RSVD_MASK, NULL, 0); 5356 } 5357 5358 static int handle_nmi_window(struct kvm_vcpu *vcpu) 5359 { 5360 WARN_ON_ONCE(!enable_vnmi); 5361 exec_controls_clearbit(to_vmx(vcpu), CPU_BASED_NMI_WINDOW_EXITING); 5362 ++vcpu->stat.nmi_window_exits; 5363 kvm_make_request(KVM_REQ_EVENT, vcpu); 5364 5365 return 1; 5366 } 5367 5368 static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) 5369 { 5370 struct vcpu_vmx *vmx = to_vmx(vcpu); 5371 bool intr_window_requested; 5372 unsigned count = 130; 5373 5374 intr_window_requested = exec_controls_get(vmx) & 5375 CPU_BASED_INTR_WINDOW_EXITING; 5376 5377 while (vmx->emulation_required && count-- != 0) { 5378 if (intr_window_requested && !vmx_interrupt_blocked(vcpu)) 5379 return handle_interrupt_window(&vmx->vcpu); 5380 5381 if (kvm_test_request(KVM_REQ_EVENT, vcpu)) 5382 return 1; 5383 5384 if (!kvm_emulate_instruction(vcpu, 0)) 5385 return 0; 5386 5387 if (vmx->emulation_required && !vmx->rmode.vm86_active && 5388 vcpu->arch.exception.pending) { 5389 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 5390 vcpu->run->internal.suberror = 5391 KVM_INTERNAL_ERROR_EMULATION; 5392 vcpu->run->internal.ndata = 0; 5393 return 0; 5394 } 5395 5396 if (vcpu->arch.halt_request) { 5397 vcpu->arch.halt_request = 0; 5398 return kvm_vcpu_halt(vcpu); 5399 } 5400 5401 /* 5402 * Note, return 1 and not 0, vcpu_run() will invoke 5403 * xfer_to_guest_mode() which will create a proper return 5404 * code. 5405 */ 5406 if (__xfer_to_guest_mode_work_pending()) 5407 return 1; 5408 } 5409 5410 return 1; 5411 } 5412 5413 static void grow_ple_window(struct kvm_vcpu *vcpu) 5414 { 5415 struct vcpu_vmx *vmx = to_vmx(vcpu); 5416 unsigned int old = vmx->ple_window; 5417 5418 vmx->ple_window = __grow_ple_window(old, ple_window, 5419 ple_window_grow, 5420 ple_window_max); 5421 5422 if (vmx->ple_window != old) { 5423 vmx->ple_window_dirty = true; 5424 trace_kvm_ple_window_update(vcpu->vcpu_id, 5425 vmx->ple_window, old); 5426 } 5427 } 5428 5429 static void shrink_ple_window(struct kvm_vcpu *vcpu) 5430 { 5431 struct vcpu_vmx *vmx = to_vmx(vcpu); 5432 unsigned int old = vmx->ple_window; 5433 5434 vmx->ple_window = __shrink_ple_window(old, ple_window, 5435 ple_window_shrink, 5436 ple_window); 5437 5438 if (vmx->ple_window != old) { 5439 vmx->ple_window_dirty = true; 5440 trace_kvm_ple_window_update(vcpu->vcpu_id, 5441 vmx->ple_window, old); 5442 } 5443 } 5444 5445 /* 5446 * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR. 5447 */ 5448 static void wakeup_handler(void) 5449 { 5450 struct kvm_vcpu *vcpu; 5451 int cpu = smp_processor_id(); 5452 5453 spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); 5454 list_for_each_entry(vcpu, &per_cpu(blocked_vcpu_on_cpu, cpu), 5455 blocked_vcpu_list) { 5456 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 5457 5458 if (pi_test_on(pi_desc) == 1) 5459 kvm_vcpu_kick(vcpu); 5460 } 5461 spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); 5462 } 5463 5464 static void vmx_enable_tdp(void) 5465 { 5466 kvm_mmu_set_mask_ptes(VMX_EPT_READABLE_MASK, 5467 enable_ept_ad_bits ? VMX_EPT_ACCESS_BIT : 0ull, 5468 enable_ept_ad_bits ? VMX_EPT_DIRTY_BIT : 0ull, 5469 0ull, VMX_EPT_EXECUTABLE_MASK, 5470 cpu_has_vmx_ept_execute_only() ? 0ull : VMX_EPT_READABLE_MASK, 5471 VMX_EPT_RWX_MASK, 0ull); 5472 5473 ept_set_mmio_spte_mask(); 5474 } 5475 5476 /* 5477 * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE 5478 * exiting, so only get here on cpu with PAUSE-Loop-Exiting. 5479 */ 5480 static int handle_pause(struct kvm_vcpu *vcpu) 5481 { 5482 if (!kvm_pause_in_guest(vcpu->kvm)) 5483 grow_ple_window(vcpu); 5484 5485 /* 5486 * Intel sdm vol3 ch-25.1.3 says: The "PAUSE-loop exiting" 5487 * VM-execution control is ignored if CPL > 0. OTOH, KVM 5488 * never set PAUSE_EXITING and just set PLE if supported, 5489 * so the vcpu must be CPL=0 if it gets a PAUSE exit. 5490 */ 5491 kvm_vcpu_on_spin(vcpu, true); 5492 return kvm_skip_emulated_instruction(vcpu); 5493 } 5494 5495 static int handle_nop(struct kvm_vcpu *vcpu) 5496 { 5497 return kvm_skip_emulated_instruction(vcpu); 5498 } 5499 5500 static int handle_mwait(struct kvm_vcpu *vcpu) 5501 { 5502 printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n"); 5503 return handle_nop(vcpu); 5504 } 5505 5506 static int handle_invalid_op(struct kvm_vcpu *vcpu) 5507 { 5508 kvm_queue_exception(vcpu, UD_VECTOR); 5509 return 1; 5510 } 5511 5512 static int handle_monitor_trap(struct kvm_vcpu *vcpu) 5513 { 5514 return 1; 5515 } 5516 5517 static int handle_monitor(struct kvm_vcpu *vcpu) 5518 { 5519 printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n"); 5520 return handle_nop(vcpu); 5521 } 5522 5523 static int handle_invpcid(struct kvm_vcpu *vcpu) 5524 { 5525 u32 vmx_instruction_info; 5526 unsigned long type; 5527 bool pcid_enabled; 5528 gva_t gva; 5529 struct x86_exception e; 5530 unsigned i; 5531 unsigned long roots_to_free = 0; 5532 struct { 5533 u64 pcid; 5534 u64 gla; 5535 } operand; 5536 int r; 5537 5538 if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) { 5539 kvm_queue_exception(vcpu, UD_VECTOR); 5540 return 1; 5541 } 5542 5543 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); 5544 type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf); 5545 5546 if (type > 3) { 5547 kvm_inject_gp(vcpu, 0); 5548 return 1; 5549 } 5550 5551 /* According to the Intel instruction reference, the memory operand 5552 * is read even if it isn't needed (e.g., for type==all) 5553 */ 5554 if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu), 5555 vmx_instruction_info, false, 5556 sizeof(operand), &gva)) 5557 return 1; 5558 5559 r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e); 5560 if (r != X86EMUL_CONTINUE) 5561 return vmx_handle_memory_failure(vcpu, r, &e); 5562 5563 if (operand.pcid >> 12 != 0) { 5564 kvm_inject_gp(vcpu, 0); 5565 return 1; 5566 } 5567 5568 pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); 5569 5570 switch (type) { 5571 case INVPCID_TYPE_INDIV_ADDR: 5572 if ((!pcid_enabled && (operand.pcid != 0)) || 5573 is_noncanonical_address(operand.gla, vcpu)) { 5574 kvm_inject_gp(vcpu, 0); 5575 return 1; 5576 } 5577 kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid); 5578 return kvm_skip_emulated_instruction(vcpu); 5579 5580 case INVPCID_TYPE_SINGLE_CTXT: 5581 if (!pcid_enabled && (operand.pcid != 0)) { 5582 kvm_inject_gp(vcpu, 0); 5583 return 1; 5584 } 5585 5586 if (kvm_get_active_pcid(vcpu) == operand.pcid) { 5587 kvm_mmu_sync_roots(vcpu); 5588 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 5589 } 5590 5591 for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) 5592 if (kvm_get_pcid(vcpu, vcpu->arch.mmu->prev_roots[i].pgd) 5593 == operand.pcid) 5594 roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); 5595 5596 kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, roots_to_free); 5597 /* 5598 * If neither the current cr3 nor any of the prev_roots use the 5599 * given PCID, then nothing needs to be done here because a 5600 * resync will happen anyway before switching to any other CR3. 5601 */ 5602 5603 return kvm_skip_emulated_instruction(vcpu); 5604 5605 case INVPCID_TYPE_ALL_NON_GLOBAL: 5606 /* 5607 * Currently, KVM doesn't mark global entries in the shadow 5608 * page tables, so a non-global flush just degenerates to a 5609 * global flush. If needed, we could optimize this later by 5610 * keeping track of global entries in shadow page tables. 5611 */ 5612 5613 /* fall-through */ 5614 case INVPCID_TYPE_ALL_INCL_GLOBAL: 5615 kvm_mmu_unload(vcpu); 5616 return kvm_skip_emulated_instruction(vcpu); 5617 5618 default: 5619 BUG(); /* We have already checked above that type <= 3 */ 5620 } 5621 } 5622 5623 static int handle_pml_full(struct kvm_vcpu *vcpu) 5624 { 5625 unsigned long exit_qualification; 5626 5627 trace_kvm_pml_full(vcpu->vcpu_id); 5628 5629 exit_qualification = vmx_get_exit_qual(vcpu); 5630 5631 /* 5632 * PML buffer FULL happened while executing iret from NMI, 5633 * "blocked by NMI" bit has to be set before next VM entry. 5634 */ 5635 if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) && 5636 enable_vnmi && 5637 (exit_qualification & INTR_INFO_UNBLOCK_NMI)) 5638 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, 5639 GUEST_INTR_STATE_NMI); 5640 5641 /* 5642 * PML buffer already flushed at beginning of VMEXIT. Nothing to do 5643 * here.., and there's no userspace involvement needed for PML. 5644 */ 5645 return 1; 5646 } 5647 5648 static fastpath_t handle_fastpath_preemption_timer(struct kvm_vcpu *vcpu) 5649 { 5650 struct vcpu_vmx *vmx = to_vmx(vcpu); 5651 5652 if (!vmx->req_immediate_exit && 5653 !unlikely(vmx->loaded_vmcs->hv_timer_soft_disabled)) { 5654 kvm_lapic_expired_hv_timer(vcpu); 5655 return EXIT_FASTPATH_REENTER_GUEST; 5656 } 5657 5658 return EXIT_FASTPATH_NONE; 5659 } 5660 5661 static int handle_preemption_timer(struct kvm_vcpu *vcpu) 5662 { 5663 handle_fastpath_preemption_timer(vcpu); 5664 return 1; 5665 } 5666 5667 /* 5668 * When nested=0, all VMX instruction VM Exits filter here. The handlers 5669 * are overwritten by nested_vmx_setup() when nested=1. 5670 */ 5671 static int handle_vmx_instruction(struct kvm_vcpu *vcpu) 5672 { 5673 kvm_queue_exception(vcpu, UD_VECTOR); 5674 return 1; 5675 } 5676 5677 static int handle_encls(struct kvm_vcpu *vcpu) 5678 { 5679 /* 5680 * SGX virtualization is not yet supported. There is no software 5681 * enable bit for SGX, so we have to trap ENCLS and inject a #UD 5682 * to prevent the guest from executing ENCLS. 5683 */ 5684 kvm_queue_exception(vcpu, UD_VECTOR); 5685 return 1; 5686 } 5687 5688 /* 5689 * The exit handlers return 1 if the exit was handled fully and guest execution 5690 * may resume. Otherwise they set the kvm_run parameter to indicate what needs 5691 * to be done to userspace and return 0. 5692 */ 5693 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { 5694 [EXIT_REASON_EXCEPTION_NMI] = handle_exception_nmi, 5695 [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, 5696 [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, 5697 [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, 5698 [EXIT_REASON_IO_INSTRUCTION] = handle_io, 5699 [EXIT_REASON_CR_ACCESS] = handle_cr, 5700 [EXIT_REASON_DR_ACCESS] = handle_dr, 5701 [EXIT_REASON_CPUID] = kvm_emulate_cpuid, 5702 [EXIT_REASON_MSR_READ] = kvm_emulate_rdmsr, 5703 [EXIT_REASON_MSR_WRITE] = kvm_emulate_wrmsr, 5704 [EXIT_REASON_INTERRUPT_WINDOW] = handle_interrupt_window, 5705 [EXIT_REASON_HLT] = kvm_emulate_halt, 5706 [EXIT_REASON_INVD] = handle_invd, 5707 [EXIT_REASON_INVLPG] = handle_invlpg, 5708 [EXIT_REASON_RDPMC] = handle_rdpmc, 5709 [EXIT_REASON_VMCALL] = handle_vmcall, 5710 [EXIT_REASON_VMCLEAR] = handle_vmx_instruction, 5711 [EXIT_REASON_VMLAUNCH] = handle_vmx_instruction, 5712 [EXIT_REASON_VMPTRLD] = handle_vmx_instruction, 5713 [EXIT_REASON_VMPTRST] = handle_vmx_instruction, 5714 [EXIT_REASON_VMREAD] = handle_vmx_instruction, 5715 [EXIT_REASON_VMRESUME] = handle_vmx_instruction, 5716 [EXIT_REASON_VMWRITE] = handle_vmx_instruction, 5717 [EXIT_REASON_VMOFF] = handle_vmx_instruction, 5718 [EXIT_REASON_VMON] = handle_vmx_instruction, 5719 [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, 5720 [EXIT_REASON_APIC_ACCESS] = handle_apic_access, 5721 [EXIT_REASON_APIC_WRITE] = handle_apic_write, 5722 [EXIT_REASON_EOI_INDUCED] = handle_apic_eoi_induced, 5723 [EXIT_REASON_WBINVD] = handle_wbinvd, 5724 [EXIT_REASON_XSETBV] = handle_xsetbv, 5725 [EXIT_REASON_TASK_SWITCH] = handle_task_switch, 5726 [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, 5727 [EXIT_REASON_GDTR_IDTR] = handle_desc, 5728 [EXIT_REASON_LDTR_TR] = handle_desc, 5729 [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, 5730 [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, 5731 [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, 5732 [EXIT_REASON_MWAIT_INSTRUCTION] = handle_mwait, 5733 [EXIT_REASON_MONITOR_TRAP_FLAG] = handle_monitor_trap, 5734 [EXIT_REASON_MONITOR_INSTRUCTION] = handle_monitor, 5735 [EXIT_REASON_INVEPT] = handle_vmx_instruction, 5736 [EXIT_REASON_INVVPID] = handle_vmx_instruction, 5737 [EXIT_REASON_RDRAND] = handle_invalid_op, 5738 [EXIT_REASON_RDSEED] = handle_invalid_op, 5739 [EXIT_REASON_PML_FULL] = handle_pml_full, 5740 [EXIT_REASON_INVPCID] = handle_invpcid, 5741 [EXIT_REASON_VMFUNC] = handle_vmx_instruction, 5742 [EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer, 5743 [EXIT_REASON_ENCLS] = handle_encls, 5744 }; 5745 5746 static const int kvm_vmx_max_exit_handlers = 5747 ARRAY_SIZE(kvm_vmx_exit_handlers); 5748 5749 static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2) 5750 { 5751 *info1 = vmx_get_exit_qual(vcpu); 5752 *info2 = vmx_get_intr_info(vcpu); 5753 } 5754 5755 static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx) 5756 { 5757 if (vmx->pml_pg) { 5758 __free_page(vmx->pml_pg); 5759 vmx->pml_pg = NULL; 5760 } 5761 } 5762 5763 static void vmx_flush_pml_buffer(struct kvm_vcpu *vcpu) 5764 { 5765 struct vcpu_vmx *vmx = to_vmx(vcpu); 5766 u64 *pml_buf; 5767 u16 pml_idx; 5768 5769 pml_idx = vmcs_read16(GUEST_PML_INDEX); 5770 5771 /* Do nothing if PML buffer is empty */ 5772 if (pml_idx == (PML_ENTITY_NUM - 1)) 5773 return; 5774 5775 /* PML index always points to next available PML buffer entity */ 5776 if (pml_idx >= PML_ENTITY_NUM) 5777 pml_idx = 0; 5778 else 5779 pml_idx++; 5780 5781 pml_buf = page_address(vmx->pml_pg); 5782 for (; pml_idx < PML_ENTITY_NUM; pml_idx++) { 5783 u64 gpa; 5784 5785 gpa = pml_buf[pml_idx]; 5786 WARN_ON(gpa & (PAGE_SIZE - 1)); 5787 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); 5788 } 5789 5790 /* reset PML index */ 5791 vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); 5792 } 5793 5794 /* 5795 * Flush all vcpus' PML buffer and update logged GPAs to dirty_bitmap. 5796 * Called before reporting dirty_bitmap to userspace. 5797 */ 5798 static void kvm_flush_pml_buffers(struct kvm *kvm) 5799 { 5800 int i; 5801 struct kvm_vcpu *vcpu; 5802 /* 5803 * We only need to kick vcpu out of guest mode here, as PML buffer 5804 * is flushed at beginning of all VMEXITs, and it's obvious that only 5805 * vcpus running in guest are possible to have unflushed GPAs in PML 5806 * buffer. 5807 */ 5808 kvm_for_each_vcpu(i, vcpu, kvm) 5809 kvm_vcpu_kick(vcpu); 5810 } 5811 5812 static void vmx_dump_sel(char *name, uint32_t sel) 5813 { 5814 pr_err("%s sel=0x%04x, attr=0x%05x, limit=0x%08x, base=0x%016lx\n", 5815 name, vmcs_read16(sel), 5816 vmcs_read32(sel + GUEST_ES_AR_BYTES - GUEST_ES_SELECTOR), 5817 vmcs_read32(sel + GUEST_ES_LIMIT - GUEST_ES_SELECTOR), 5818 vmcs_readl(sel + GUEST_ES_BASE - GUEST_ES_SELECTOR)); 5819 } 5820 5821 static void vmx_dump_dtsel(char *name, uint32_t limit) 5822 { 5823 pr_err("%s limit=0x%08x, base=0x%016lx\n", 5824 name, vmcs_read32(limit), 5825 vmcs_readl(limit + GUEST_GDTR_BASE - GUEST_GDTR_LIMIT)); 5826 } 5827 5828 void dump_vmcs(void) 5829 { 5830 u32 vmentry_ctl, vmexit_ctl; 5831 u32 cpu_based_exec_ctrl, pin_based_exec_ctrl, secondary_exec_control; 5832 unsigned long cr4; 5833 u64 efer; 5834 5835 if (!dump_invalid_vmcs) { 5836 pr_warn_ratelimited("set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.\n"); 5837 return; 5838 } 5839 5840 vmentry_ctl = vmcs_read32(VM_ENTRY_CONTROLS); 5841 vmexit_ctl = vmcs_read32(VM_EXIT_CONTROLS); 5842 cpu_based_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); 5843 pin_based_exec_ctrl = vmcs_read32(PIN_BASED_VM_EXEC_CONTROL); 5844 cr4 = vmcs_readl(GUEST_CR4); 5845 efer = vmcs_read64(GUEST_IA32_EFER); 5846 secondary_exec_control = 0; 5847 if (cpu_has_secondary_exec_ctrls()) 5848 secondary_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); 5849 5850 pr_err("*** Guest State ***\n"); 5851 pr_err("CR0: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n", 5852 vmcs_readl(GUEST_CR0), vmcs_readl(CR0_READ_SHADOW), 5853 vmcs_readl(CR0_GUEST_HOST_MASK)); 5854 pr_err("CR4: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n", 5855 cr4, vmcs_readl(CR4_READ_SHADOW), vmcs_readl(CR4_GUEST_HOST_MASK)); 5856 pr_err("CR3 = 0x%016lx\n", vmcs_readl(GUEST_CR3)); 5857 if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT) && 5858 (cr4 & X86_CR4_PAE) && !(efer & EFER_LMA)) 5859 { 5860 pr_err("PDPTR0 = 0x%016llx PDPTR1 = 0x%016llx\n", 5861 vmcs_read64(GUEST_PDPTR0), vmcs_read64(GUEST_PDPTR1)); 5862 pr_err("PDPTR2 = 0x%016llx PDPTR3 = 0x%016llx\n", 5863 vmcs_read64(GUEST_PDPTR2), vmcs_read64(GUEST_PDPTR3)); 5864 } 5865 pr_err("RSP = 0x%016lx RIP = 0x%016lx\n", 5866 vmcs_readl(GUEST_RSP), vmcs_readl(GUEST_RIP)); 5867 pr_err("RFLAGS=0x%08lx DR7 = 0x%016lx\n", 5868 vmcs_readl(GUEST_RFLAGS), vmcs_readl(GUEST_DR7)); 5869 pr_err("Sysenter RSP=%016lx CS:RIP=%04x:%016lx\n", 5870 vmcs_readl(GUEST_SYSENTER_ESP), 5871 vmcs_read32(GUEST_SYSENTER_CS), vmcs_readl(GUEST_SYSENTER_EIP)); 5872 vmx_dump_sel("CS: ", GUEST_CS_SELECTOR); 5873 vmx_dump_sel("DS: ", GUEST_DS_SELECTOR); 5874 vmx_dump_sel("SS: ", GUEST_SS_SELECTOR); 5875 vmx_dump_sel("ES: ", GUEST_ES_SELECTOR); 5876 vmx_dump_sel("FS: ", GUEST_FS_SELECTOR); 5877 vmx_dump_sel("GS: ", GUEST_GS_SELECTOR); 5878 vmx_dump_dtsel("GDTR:", GUEST_GDTR_LIMIT); 5879 vmx_dump_sel("LDTR:", GUEST_LDTR_SELECTOR); 5880 vmx_dump_dtsel("IDTR:", GUEST_IDTR_LIMIT); 5881 vmx_dump_sel("TR: ", GUEST_TR_SELECTOR); 5882 if ((vmexit_ctl & (VM_EXIT_SAVE_IA32_PAT | VM_EXIT_SAVE_IA32_EFER)) || 5883 (vmentry_ctl & (VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_IA32_EFER))) 5884 pr_err("EFER = 0x%016llx PAT = 0x%016llx\n", 5885 efer, vmcs_read64(GUEST_IA32_PAT)); 5886 pr_err("DebugCtl = 0x%016llx DebugExceptions = 0x%016lx\n", 5887 vmcs_read64(GUEST_IA32_DEBUGCTL), 5888 vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS)); 5889 if (cpu_has_load_perf_global_ctrl() && 5890 vmentry_ctl & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) 5891 pr_err("PerfGlobCtl = 0x%016llx\n", 5892 vmcs_read64(GUEST_IA32_PERF_GLOBAL_CTRL)); 5893 if (vmentry_ctl & VM_ENTRY_LOAD_BNDCFGS) 5894 pr_err("BndCfgS = 0x%016llx\n", vmcs_read64(GUEST_BNDCFGS)); 5895 pr_err("Interruptibility = %08x ActivityState = %08x\n", 5896 vmcs_read32(GUEST_INTERRUPTIBILITY_INFO), 5897 vmcs_read32(GUEST_ACTIVITY_STATE)); 5898 if (secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) 5899 pr_err("InterruptStatus = %04x\n", 5900 vmcs_read16(GUEST_INTR_STATUS)); 5901 5902 pr_err("*** Host State ***\n"); 5903 pr_err("RIP = 0x%016lx RSP = 0x%016lx\n", 5904 vmcs_readl(HOST_RIP), vmcs_readl(HOST_RSP)); 5905 pr_err("CS=%04x SS=%04x DS=%04x ES=%04x FS=%04x GS=%04x TR=%04x\n", 5906 vmcs_read16(HOST_CS_SELECTOR), vmcs_read16(HOST_SS_SELECTOR), 5907 vmcs_read16(HOST_DS_SELECTOR), vmcs_read16(HOST_ES_SELECTOR), 5908 vmcs_read16(HOST_FS_SELECTOR), vmcs_read16(HOST_GS_SELECTOR), 5909 vmcs_read16(HOST_TR_SELECTOR)); 5910 pr_err("FSBase=%016lx GSBase=%016lx TRBase=%016lx\n", 5911 vmcs_readl(HOST_FS_BASE), vmcs_readl(HOST_GS_BASE), 5912 vmcs_readl(HOST_TR_BASE)); 5913 pr_err("GDTBase=%016lx IDTBase=%016lx\n", 5914 vmcs_readl(HOST_GDTR_BASE), vmcs_readl(HOST_IDTR_BASE)); 5915 pr_err("CR0=%016lx CR3=%016lx CR4=%016lx\n", 5916 vmcs_readl(HOST_CR0), vmcs_readl(HOST_CR3), 5917 vmcs_readl(HOST_CR4)); 5918 pr_err("Sysenter RSP=%016lx CS:RIP=%04x:%016lx\n", 5919 vmcs_readl(HOST_IA32_SYSENTER_ESP), 5920 vmcs_read32(HOST_IA32_SYSENTER_CS), 5921 vmcs_readl(HOST_IA32_SYSENTER_EIP)); 5922 if (vmexit_ctl & (VM_EXIT_LOAD_IA32_PAT | VM_EXIT_LOAD_IA32_EFER)) 5923 pr_err("EFER = 0x%016llx PAT = 0x%016llx\n", 5924 vmcs_read64(HOST_IA32_EFER), 5925 vmcs_read64(HOST_IA32_PAT)); 5926 if (cpu_has_load_perf_global_ctrl() && 5927 vmexit_ctl & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) 5928 pr_err("PerfGlobCtl = 0x%016llx\n", 5929 vmcs_read64(HOST_IA32_PERF_GLOBAL_CTRL)); 5930 5931 pr_err("*** Control State ***\n"); 5932 pr_err("PinBased=%08x CPUBased=%08x SecondaryExec=%08x\n", 5933 pin_based_exec_ctrl, cpu_based_exec_ctrl, secondary_exec_control); 5934 pr_err("EntryControls=%08x ExitControls=%08x\n", vmentry_ctl, vmexit_ctl); 5935 pr_err("ExceptionBitmap=%08x PFECmask=%08x PFECmatch=%08x\n", 5936 vmcs_read32(EXCEPTION_BITMAP), 5937 vmcs_read32(PAGE_FAULT_ERROR_CODE_MASK), 5938 vmcs_read32(PAGE_FAULT_ERROR_CODE_MATCH)); 5939 pr_err("VMEntry: intr_info=%08x errcode=%08x ilen=%08x\n", 5940 vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), 5941 vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE), 5942 vmcs_read32(VM_ENTRY_INSTRUCTION_LEN)); 5943 pr_err("VMExit: intr_info=%08x errcode=%08x ilen=%08x\n", 5944 vmcs_read32(VM_EXIT_INTR_INFO), 5945 vmcs_read32(VM_EXIT_INTR_ERROR_CODE), 5946 vmcs_read32(VM_EXIT_INSTRUCTION_LEN)); 5947 pr_err(" reason=%08x qualification=%016lx\n", 5948 vmcs_read32(VM_EXIT_REASON), vmcs_readl(EXIT_QUALIFICATION)); 5949 pr_err("IDTVectoring: info=%08x errcode=%08x\n", 5950 vmcs_read32(IDT_VECTORING_INFO_FIELD), 5951 vmcs_read32(IDT_VECTORING_ERROR_CODE)); 5952 pr_err("TSC Offset = 0x%016llx\n", vmcs_read64(TSC_OFFSET)); 5953 if (secondary_exec_control & SECONDARY_EXEC_TSC_SCALING) 5954 pr_err("TSC Multiplier = 0x%016llx\n", 5955 vmcs_read64(TSC_MULTIPLIER)); 5956 if (cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW) { 5957 if (secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) { 5958 u16 status = vmcs_read16(GUEST_INTR_STATUS); 5959 pr_err("SVI|RVI = %02x|%02x ", status >> 8, status & 0xff); 5960 } 5961 pr_cont("TPR Threshold = 0x%02x\n", vmcs_read32(TPR_THRESHOLD)); 5962 if (secondary_exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) 5963 pr_err("APIC-access addr = 0x%016llx ", vmcs_read64(APIC_ACCESS_ADDR)); 5964 pr_cont("virt-APIC addr = 0x%016llx\n", vmcs_read64(VIRTUAL_APIC_PAGE_ADDR)); 5965 } 5966 if (pin_based_exec_ctrl & PIN_BASED_POSTED_INTR) 5967 pr_err("PostedIntrVec = 0x%02x\n", vmcs_read16(POSTED_INTR_NV)); 5968 if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT)) 5969 pr_err("EPT pointer = 0x%016llx\n", vmcs_read64(EPT_POINTER)); 5970 if (secondary_exec_control & SECONDARY_EXEC_PAUSE_LOOP_EXITING) 5971 pr_err("PLE Gap=%08x Window=%08x\n", 5972 vmcs_read32(PLE_GAP), vmcs_read32(PLE_WINDOW)); 5973 if (secondary_exec_control & SECONDARY_EXEC_ENABLE_VPID) 5974 pr_err("Virtual processor ID = 0x%04x\n", 5975 vmcs_read16(VIRTUAL_PROCESSOR_ID)); 5976 } 5977 5978 /* 5979 * The guest has exited. See if we can fix it or if we need userspace 5980 * assistance. 5981 */ 5982 static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) 5983 { 5984 struct vcpu_vmx *vmx = to_vmx(vcpu); 5985 u32 exit_reason = vmx->exit_reason; 5986 u32 vectoring_info = vmx->idt_vectoring_info; 5987 5988 /* 5989 * Flush logged GPAs PML buffer, this will make dirty_bitmap more 5990 * updated. Another good is, in kvm_vm_ioctl_get_dirty_log, before 5991 * querying dirty_bitmap, we only need to kick all vcpus out of guest 5992 * mode as if vcpus is in root mode, the PML buffer must has been 5993 * flushed already. 5994 */ 5995 if (enable_pml) 5996 vmx_flush_pml_buffer(vcpu); 5997 5998 /* 5999 * We should never reach this point with a pending nested VM-Enter, and 6000 * more specifically emulation of L2 due to invalid guest state (see 6001 * below) should never happen as that means we incorrectly allowed a 6002 * nested VM-Enter with an invalid vmcs12. 6003 */ 6004 WARN_ON_ONCE(vmx->nested.nested_run_pending); 6005 6006 /* If guest state is invalid, start emulating */ 6007 if (vmx->emulation_required) 6008 return handle_invalid_guest_state(vcpu); 6009 6010 if (is_guest_mode(vcpu)) { 6011 /* 6012 * The host physical addresses of some pages of guest memory 6013 * are loaded into the vmcs02 (e.g. vmcs12's Virtual APIC 6014 * Page). The CPU may write to these pages via their host 6015 * physical address while L2 is running, bypassing any 6016 * address-translation-based dirty tracking (e.g. EPT write 6017 * protection). 6018 * 6019 * Mark them dirty on every exit from L2 to prevent them from 6020 * getting out of sync with dirty tracking. 6021 */ 6022 nested_mark_vmcs12_pages_dirty(vcpu); 6023 6024 if (nested_vmx_reflect_vmexit(vcpu)) 6025 return 1; 6026 } 6027 6028 if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { 6029 dump_vmcs(); 6030 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; 6031 vcpu->run->fail_entry.hardware_entry_failure_reason 6032 = exit_reason; 6033 vcpu->run->fail_entry.cpu = vcpu->arch.last_vmentry_cpu; 6034 return 0; 6035 } 6036 6037 if (unlikely(vmx->fail)) { 6038 dump_vmcs(); 6039 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; 6040 vcpu->run->fail_entry.hardware_entry_failure_reason 6041 = vmcs_read32(VM_INSTRUCTION_ERROR); 6042 vcpu->run->fail_entry.cpu = vcpu->arch.last_vmentry_cpu; 6043 return 0; 6044 } 6045 6046 /* 6047 * Note: 6048 * Do not try to fix EXIT_REASON_EPT_MISCONFIG if it caused by 6049 * delivery event since it indicates guest is accessing MMIO. 6050 * The vm-exit can be triggered again after return to guest that 6051 * will cause infinite loop. 6052 */ 6053 if ((vectoring_info & VECTORING_INFO_VALID_MASK) && 6054 (exit_reason != EXIT_REASON_EXCEPTION_NMI && 6055 exit_reason != EXIT_REASON_EPT_VIOLATION && 6056 exit_reason != EXIT_REASON_PML_FULL && 6057 exit_reason != EXIT_REASON_TASK_SWITCH)) { 6058 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 6059 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_DELIVERY_EV; 6060 vcpu->run->internal.ndata = 3; 6061 vcpu->run->internal.data[0] = vectoring_info; 6062 vcpu->run->internal.data[1] = exit_reason; 6063 vcpu->run->internal.data[2] = vcpu->arch.exit_qualification; 6064 if (exit_reason == EXIT_REASON_EPT_MISCONFIG) { 6065 vcpu->run->internal.ndata++; 6066 vcpu->run->internal.data[3] = 6067 vmcs_read64(GUEST_PHYSICAL_ADDRESS); 6068 } 6069 vcpu->run->internal.data[vcpu->run->internal.ndata++] = 6070 vcpu->arch.last_vmentry_cpu; 6071 return 0; 6072 } 6073 6074 if (unlikely(!enable_vnmi && 6075 vmx->loaded_vmcs->soft_vnmi_blocked)) { 6076 if (!vmx_interrupt_blocked(vcpu)) { 6077 vmx->loaded_vmcs->soft_vnmi_blocked = 0; 6078 } else if (vmx->loaded_vmcs->vnmi_blocked_time > 1000000000LL && 6079 vcpu->arch.nmi_pending) { 6080 /* 6081 * This CPU don't support us in finding the end of an 6082 * NMI-blocked window if the guest runs with IRQs 6083 * disabled. So we pull the trigger after 1 s of 6084 * futile waiting, but inform the user about this. 6085 */ 6086 printk(KERN_WARNING "%s: Breaking out of NMI-blocked " 6087 "state on VCPU %d after 1 s timeout\n", 6088 __func__, vcpu->vcpu_id); 6089 vmx->loaded_vmcs->soft_vnmi_blocked = 0; 6090 } 6091 } 6092 6093 if (exit_fastpath != EXIT_FASTPATH_NONE) 6094 return 1; 6095 6096 if (exit_reason >= kvm_vmx_max_exit_handlers) 6097 goto unexpected_vmexit; 6098 #ifdef CONFIG_RETPOLINE 6099 if (exit_reason == EXIT_REASON_MSR_WRITE) 6100 return kvm_emulate_wrmsr(vcpu); 6101 else if (exit_reason == EXIT_REASON_PREEMPTION_TIMER) 6102 return handle_preemption_timer(vcpu); 6103 else if (exit_reason == EXIT_REASON_INTERRUPT_WINDOW) 6104 return handle_interrupt_window(vcpu); 6105 else if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) 6106 return handle_external_interrupt(vcpu); 6107 else if (exit_reason == EXIT_REASON_HLT) 6108 return kvm_emulate_halt(vcpu); 6109 else if (exit_reason == EXIT_REASON_EPT_MISCONFIG) 6110 return handle_ept_misconfig(vcpu); 6111 #endif 6112 6113 exit_reason = array_index_nospec(exit_reason, 6114 kvm_vmx_max_exit_handlers); 6115 if (!kvm_vmx_exit_handlers[exit_reason]) 6116 goto unexpected_vmexit; 6117 6118 return kvm_vmx_exit_handlers[exit_reason](vcpu); 6119 6120 unexpected_vmexit: 6121 vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n", exit_reason); 6122 dump_vmcs(); 6123 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 6124 vcpu->run->internal.suberror = 6125 KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; 6126 vcpu->run->internal.ndata = 2; 6127 vcpu->run->internal.data[0] = exit_reason; 6128 vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu; 6129 return 0; 6130 } 6131 6132 /* 6133 * Software based L1D cache flush which is used when microcode providing 6134 * the cache control MSR is not loaded. 6135 * 6136 * The L1D cache is 32 KiB on Nehalem and later microarchitectures, but to 6137 * flush it is required to read in 64 KiB because the replacement algorithm 6138 * is not exactly LRU. This could be sized at runtime via topology 6139 * information but as all relevant affected CPUs have 32KiB L1D cache size 6140 * there is no point in doing so. 6141 */ 6142 static noinstr void vmx_l1d_flush(struct kvm_vcpu *vcpu) 6143 { 6144 int size = PAGE_SIZE << L1D_CACHE_ORDER; 6145 6146 /* 6147 * This code is only executed when the the flush mode is 'cond' or 6148 * 'always' 6149 */ 6150 if (static_branch_likely(&vmx_l1d_flush_cond)) { 6151 bool flush_l1d; 6152 6153 /* 6154 * Clear the per-vcpu flush bit, it gets set again 6155 * either from vcpu_run() or from one of the unsafe 6156 * VMEXIT handlers. 6157 */ 6158 flush_l1d = vcpu->arch.l1tf_flush_l1d; 6159 vcpu->arch.l1tf_flush_l1d = false; 6160 6161 /* 6162 * Clear the per-cpu flush bit, it gets set again from 6163 * the interrupt handlers. 6164 */ 6165 flush_l1d |= kvm_get_cpu_l1tf_flush_l1d(); 6166 kvm_clear_cpu_l1tf_flush_l1d(); 6167 6168 if (!flush_l1d) 6169 return; 6170 } 6171 6172 vcpu->stat.l1d_flush++; 6173 6174 if (static_cpu_has(X86_FEATURE_FLUSH_L1D)) { 6175 native_wrmsrl(MSR_IA32_FLUSH_CMD, L1D_FLUSH); 6176 return; 6177 } 6178 6179 asm volatile( 6180 /* First ensure the pages are in the TLB */ 6181 "xorl %%eax, %%eax\n" 6182 ".Lpopulate_tlb:\n\t" 6183 "movzbl (%[flush_pages], %%" _ASM_AX "), %%ecx\n\t" 6184 "addl $4096, %%eax\n\t" 6185 "cmpl %%eax, %[size]\n\t" 6186 "jne .Lpopulate_tlb\n\t" 6187 "xorl %%eax, %%eax\n\t" 6188 "cpuid\n\t" 6189 /* Now fill the cache */ 6190 "xorl %%eax, %%eax\n" 6191 ".Lfill_cache:\n" 6192 "movzbl (%[flush_pages], %%" _ASM_AX "), %%ecx\n\t" 6193 "addl $64, %%eax\n\t" 6194 "cmpl %%eax, %[size]\n\t" 6195 "jne .Lfill_cache\n\t" 6196 "lfence\n" 6197 :: [flush_pages] "r" (vmx_l1d_flush_pages), 6198 [size] "r" (size) 6199 : "eax", "ebx", "ecx", "edx"); 6200 } 6201 6202 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) 6203 { 6204 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 6205 int tpr_threshold; 6206 6207 if (is_guest_mode(vcpu) && 6208 nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) 6209 return; 6210 6211 tpr_threshold = (irr == -1 || tpr < irr) ? 0 : irr; 6212 if (is_guest_mode(vcpu)) 6213 to_vmx(vcpu)->nested.l1_tpr_threshold = tpr_threshold; 6214 else 6215 vmcs_write32(TPR_THRESHOLD, tpr_threshold); 6216 } 6217 6218 void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu) 6219 { 6220 struct vcpu_vmx *vmx = to_vmx(vcpu); 6221 u32 sec_exec_control; 6222 6223 if (!lapic_in_kernel(vcpu)) 6224 return; 6225 6226 if (!flexpriority_enabled && 6227 !cpu_has_vmx_virtualize_x2apic_mode()) 6228 return; 6229 6230 /* Postpone execution until vmcs01 is the current VMCS. */ 6231 if (is_guest_mode(vcpu)) { 6232 vmx->nested.change_vmcs01_virtual_apic_mode = true; 6233 return; 6234 } 6235 6236 sec_exec_control = secondary_exec_controls_get(vmx); 6237 sec_exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | 6238 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE); 6239 6240 switch (kvm_get_apic_mode(vcpu)) { 6241 case LAPIC_MODE_INVALID: 6242 WARN_ONCE(true, "Invalid local APIC state"); 6243 case LAPIC_MODE_DISABLED: 6244 break; 6245 case LAPIC_MODE_XAPIC: 6246 if (flexpriority_enabled) { 6247 sec_exec_control |= 6248 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; 6249 kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); 6250 6251 /* 6252 * Flush the TLB, reloading the APIC access page will 6253 * only do so if its physical address has changed, but 6254 * the guest may have inserted a non-APIC mapping into 6255 * the TLB while the APIC access page was disabled. 6256 */ 6257 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 6258 } 6259 break; 6260 case LAPIC_MODE_X2APIC: 6261 if (cpu_has_vmx_virtualize_x2apic_mode()) 6262 sec_exec_control |= 6263 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; 6264 break; 6265 } 6266 secondary_exec_controls_set(vmx, sec_exec_control); 6267 6268 vmx_update_msr_bitmap(vcpu); 6269 } 6270 6271 static void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu) 6272 { 6273 struct page *page; 6274 6275 /* Defer reload until vmcs01 is the current VMCS. */ 6276 if (is_guest_mode(vcpu)) { 6277 to_vmx(vcpu)->nested.reload_vmcs01_apic_access_page = true; 6278 return; 6279 } 6280 6281 if (!(secondary_exec_controls_get(to_vmx(vcpu)) & 6282 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) 6283 return; 6284 6285 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); 6286 if (is_error_page(page)) 6287 return; 6288 6289 vmcs_write64(APIC_ACCESS_ADDR, page_to_phys(page)); 6290 vmx_flush_tlb_current(vcpu); 6291 6292 /* 6293 * Do not pin apic access page in memory, the MMU notifier 6294 * will call us again if it is migrated or swapped out. 6295 */ 6296 put_page(page); 6297 } 6298 6299 static void vmx_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr) 6300 { 6301 u16 status; 6302 u8 old; 6303 6304 if (max_isr == -1) 6305 max_isr = 0; 6306 6307 status = vmcs_read16(GUEST_INTR_STATUS); 6308 old = status >> 8; 6309 if (max_isr != old) { 6310 status &= 0xff; 6311 status |= max_isr << 8; 6312 vmcs_write16(GUEST_INTR_STATUS, status); 6313 } 6314 } 6315 6316 static void vmx_set_rvi(int vector) 6317 { 6318 u16 status; 6319 u8 old; 6320 6321 if (vector == -1) 6322 vector = 0; 6323 6324 status = vmcs_read16(GUEST_INTR_STATUS); 6325 old = (u8)status & 0xff; 6326 if ((u8)vector != old) { 6327 status &= ~0xff; 6328 status |= (u8)vector; 6329 vmcs_write16(GUEST_INTR_STATUS, status); 6330 } 6331 } 6332 6333 static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr) 6334 { 6335 /* 6336 * When running L2, updating RVI is only relevant when 6337 * vmcs12 virtual-interrupt-delivery enabled. 6338 * However, it can be enabled only when L1 also 6339 * intercepts external-interrupts and in that case 6340 * we should not update vmcs02 RVI but instead intercept 6341 * interrupt. Therefore, do nothing when running L2. 6342 */ 6343 if (!is_guest_mode(vcpu)) 6344 vmx_set_rvi(max_irr); 6345 } 6346 6347 static int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu) 6348 { 6349 struct vcpu_vmx *vmx = to_vmx(vcpu); 6350 int max_irr; 6351 bool max_irr_updated; 6352 6353 WARN_ON(!vcpu->arch.apicv_active); 6354 if (pi_test_on(&vmx->pi_desc)) { 6355 pi_clear_on(&vmx->pi_desc); 6356 /* 6357 * IOMMU can write to PID.ON, so the barrier matters even on UP. 6358 * But on x86 this is just a compiler barrier anyway. 6359 */ 6360 smp_mb__after_atomic(); 6361 max_irr_updated = 6362 kvm_apic_update_irr(vcpu, vmx->pi_desc.pir, &max_irr); 6363 6364 /* 6365 * If we are running L2 and L1 has a new pending interrupt 6366 * which can be injected, we should re-evaluate 6367 * what should be done with this new L1 interrupt. 6368 * If L1 intercepts external-interrupts, we should 6369 * exit from L2 to L1. Otherwise, interrupt should be 6370 * delivered directly to L2. 6371 */ 6372 if (is_guest_mode(vcpu) && max_irr_updated) { 6373 if (nested_exit_on_intr(vcpu)) 6374 kvm_vcpu_exiting_guest_mode(vcpu); 6375 else 6376 kvm_make_request(KVM_REQ_EVENT, vcpu); 6377 } 6378 } else { 6379 max_irr = kvm_lapic_find_highest_irr(vcpu); 6380 } 6381 vmx_hwapic_irr_update(vcpu, max_irr); 6382 return max_irr; 6383 } 6384 6385 static bool vmx_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu) 6386 { 6387 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 6388 6389 return pi_test_on(pi_desc) || 6390 (pi_test_sn(pi_desc) && !pi_is_pir_empty(pi_desc)); 6391 } 6392 6393 static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap) 6394 { 6395 if (!kvm_vcpu_apicv_active(vcpu)) 6396 return; 6397 6398 vmcs_write64(EOI_EXIT_BITMAP0, eoi_exit_bitmap[0]); 6399 vmcs_write64(EOI_EXIT_BITMAP1, eoi_exit_bitmap[1]); 6400 vmcs_write64(EOI_EXIT_BITMAP2, eoi_exit_bitmap[2]); 6401 vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]); 6402 } 6403 6404 static void vmx_apicv_post_state_restore(struct kvm_vcpu *vcpu) 6405 { 6406 struct vcpu_vmx *vmx = to_vmx(vcpu); 6407 6408 pi_clear_on(&vmx->pi_desc); 6409 memset(vmx->pi_desc.pir, 0, sizeof(vmx->pi_desc.pir)); 6410 } 6411 6412 static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx) 6413 { 6414 u32 intr_info = vmx_get_intr_info(&vmx->vcpu); 6415 6416 /* if exit due to PF check for async PF */ 6417 if (is_page_fault(intr_info)) { 6418 vmx->vcpu.arch.apf.host_apf_flags = kvm_read_and_reset_apf_flags(); 6419 /* Handle machine checks before interrupts are enabled */ 6420 } else if (is_machine_check(intr_info)) { 6421 kvm_machine_check(); 6422 /* We need to handle NMIs before interrupts are enabled */ 6423 } else if (is_nmi(intr_info)) { 6424 kvm_before_interrupt(&vmx->vcpu); 6425 asm("int $2"); 6426 kvm_after_interrupt(&vmx->vcpu); 6427 } 6428 } 6429 6430 static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu) 6431 { 6432 unsigned int vector; 6433 unsigned long entry; 6434 #ifdef CONFIG_X86_64 6435 unsigned long tmp; 6436 #endif 6437 gate_desc *desc; 6438 u32 intr_info = vmx_get_intr_info(vcpu); 6439 6440 if (WARN_ONCE(!is_external_intr(intr_info), 6441 "KVM: unexpected VM-Exit interrupt info: 0x%x", intr_info)) 6442 return; 6443 6444 vector = intr_info & INTR_INFO_VECTOR_MASK; 6445 desc = (gate_desc *)host_idt_base + vector; 6446 entry = gate_offset(desc); 6447 6448 kvm_before_interrupt(vcpu); 6449 6450 asm volatile( 6451 #ifdef CONFIG_X86_64 6452 "mov %%rsp, %[sp]\n\t" 6453 "and $-16, %%rsp\n\t" 6454 "push %[ss]\n\t" 6455 "push %[sp]\n\t" 6456 #endif 6457 "pushf\n\t" 6458 "push %[cs]\n\t" 6459 CALL_NOSPEC 6460 : 6461 #ifdef CONFIG_X86_64 6462 [sp]"=&r"(tmp), 6463 #endif 6464 ASM_CALL_CONSTRAINT 6465 : 6466 [thunk_target]"r"(entry), 6467 #ifdef CONFIG_X86_64 6468 [ss]"i"(__KERNEL_DS), 6469 #endif 6470 [cs]"i"(__KERNEL_CS) 6471 ); 6472 6473 kvm_after_interrupt(vcpu); 6474 } 6475 STACK_FRAME_NON_STANDARD(handle_external_interrupt_irqoff); 6476 6477 static void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu) 6478 { 6479 struct vcpu_vmx *vmx = to_vmx(vcpu); 6480 6481 if (vmx->exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) 6482 handle_external_interrupt_irqoff(vcpu); 6483 else if (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI) 6484 handle_exception_nmi_irqoff(vmx); 6485 } 6486 6487 static bool vmx_has_emulated_msr(u32 index) 6488 { 6489 switch (index) { 6490 case MSR_IA32_SMBASE: 6491 /* 6492 * We cannot do SMM unless we can run the guest in big 6493 * real mode. 6494 */ 6495 return enable_unrestricted_guest || emulate_invalid_guest_state; 6496 case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: 6497 return nested; 6498 case MSR_AMD64_VIRT_SPEC_CTRL: 6499 /* This is AMD only. */ 6500 return false; 6501 default: 6502 return true; 6503 } 6504 } 6505 6506 static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx) 6507 { 6508 u32 exit_intr_info; 6509 bool unblock_nmi; 6510 u8 vector; 6511 bool idtv_info_valid; 6512 6513 idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK; 6514 6515 if (enable_vnmi) { 6516 if (vmx->loaded_vmcs->nmi_known_unmasked) 6517 return; 6518 6519 exit_intr_info = vmx_get_intr_info(&vmx->vcpu); 6520 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; 6521 vector = exit_intr_info & INTR_INFO_VECTOR_MASK; 6522 /* 6523 * SDM 3: 27.7.1.2 (September 2008) 6524 * Re-set bit "block by NMI" before VM entry if vmexit caused by 6525 * a guest IRET fault. 6526 * SDM 3: 23.2.2 (September 2008) 6527 * Bit 12 is undefined in any of the following cases: 6528 * If the VM exit sets the valid bit in the IDT-vectoring 6529 * information field. 6530 * If the VM exit is due to a double fault. 6531 */ 6532 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && 6533 vector != DF_VECTOR && !idtv_info_valid) 6534 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, 6535 GUEST_INTR_STATE_NMI); 6536 else 6537 vmx->loaded_vmcs->nmi_known_unmasked = 6538 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) 6539 & GUEST_INTR_STATE_NMI); 6540 } else if (unlikely(vmx->loaded_vmcs->soft_vnmi_blocked)) 6541 vmx->loaded_vmcs->vnmi_blocked_time += 6542 ktime_to_ns(ktime_sub(ktime_get(), 6543 vmx->loaded_vmcs->entry_time)); 6544 } 6545 6546 static void __vmx_complete_interrupts(struct kvm_vcpu *vcpu, 6547 u32 idt_vectoring_info, 6548 int instr_len_field, 6549 int error_code_field) 6550 { 6551 u8 vector; 6552 int type; 6553 bool idtv_info_valid; 6554 6555 idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; 6556 6557 vcpu->arch.nmi_injected = false; 6558 kvm_clear_exception_queue(vcpu); 6559 kvm_clear_interrupt_queue(vcpu); 6560 6561 if (!idtv_info_valid) 6562 return; 6563 6564 kvm_make_request(KVM_REQ_EVENT, vcpu); 6565 6566 vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; 6567 type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; 6568 6569 switch (type) { 6570 case INTR_TYPE_NMI_INTR: 6571 vcpu->arch.nmi_injected = true; 6572 /* 6573 * SDM 3: 27.7.1.2 (September 2008) 6574 * Clear bit "block by NMI" before VM entry if a NMI 6575 * delivery faulted. 6576 */ 6577 vmx_set_nmi_mask(vcpu, false); 6578 break; 6579 case INTR_TYPE_SOFT_EXCEPTION: 6580 vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); 6581 /* fall through */ 6582 case INTR_TYPE_HARD_EXCEPTION: 6583 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { 6584 u32 err = vmcs_read32(error_code_field); 6585 kvm_requeue_exception_e(vcpu, vector, err); 6586 } else 6587 kvm_requeue_exception(vcpu, vector); 6588 break; 6589 case INTR_TYPE_SOFT_INTR: 6590 vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); 6591 /* fall through */ 6592 case INTR_TYPE_EXT_INTR: 6593 kvm_queue_interrupt(vcpu, vector, type == INTR_TYPE_SOFT_INTR); 6594 break; 6595 default: 6596 break; 6597 } 6598 } 6599 6600 static void vmx_complete_interrupts(struct vcpu_vmx *vmx) 6601 { 6602 __vmx_complete_interrupts(&vmx->vcpu, vmx->idt_vectoring_info, 6603 VM_EXIT_INSTRUCTION_LEN, 6604 IDT_VECTORING_ERROR_CODE); 6605 } 6606 6607 static void vmx_cancel_injection(struct kvm_vcpu *vcpu) 6608 { 6609 __vmx_complete_interrupts(vcpu, 6610 vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), 6611 VM_ENTRY_INSTRUCTION_LEN, 6612 VM_ENTRY_EXCEPTION_ERROR_CODE); 6613 6614 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); 6615 } 6616 6617 static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) 6618 { 6619 int i, nr_msrs; 6620 struct perf_guest_switch_msr *msrs; 6621 6622 msrs = perf_guest_get_msrs(&nr_msrs); 6623 6624 if (!msrs) 6625 return; 6626 6627 for (i = 0; i < nr_msrs; i++) 6628 if (msrs[i].host == msrs[i].guest) 6629 clear_atomic_switch_msr(vmx, msrs[i].msr); 6630 else 6631 add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest, 6632 msrs[i].host, false); 6633 } 6634 6635 static void vmx_update_hv_timer(struct kvm_vcpu *vcpu) 6636 { 6637 struct vcpu_vmx *vmx = to_vmx(vcpu); 6638 u64 tscl; 6639 u32 delta_tsc; 6640 6641 if (vmx->req_immediate_exit) { 6642 vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, 0); 6643 vmx->loaded_vmcs->hv_timer_soft_disabled = false; 6644 } else if (vmx->hv_deadline_tsc != -1) { 6645 tscl = rdtsc(); 6646 if (vmx->hv_deadline_tsc > tscl) 6647 /* set_hv_timer ensures the delta fits in 32-bits */ 6648 delta_tsc = (u32)((vmx->hv_deadline_tsc - tscl) >> 6649 cpu_preemption_timer_multi); 6650 else 6651 delta_tsc = 0; 6652 6653 vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, delta_tsc); 6654 vmx->loaded_vmcs->hv_timer_soft_disabled = false; 6655 } else if (!vmx->loaded_vmcs->hv_timer_soft_disabled) { 6656 vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, -1); 6657 vmx->loaded_vmcs->hv_timer_soft_disabled = true; 6658 } 6659 } 6660 6661 void noinstr vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp) 6662 { 6663 if (unlikely(host_rsp != vmx->loaded_vmcs->host_state.rsp)) { 6664 vmx->loaded_vmcs->host_state.rsp = host_rsp; 6665 vmcs_writel(HOST_RSP, host_rsp); 6666 } 6667 } 6668 6669 static fastpath_t vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu) 6670 { 6671 switch (to_vmx(vcpu)->exit_reason) { 6672 case EXIT_REASON_MSR_WRITE: 6673 return handle_fastpath_set_msr_irqoff(vcpu); 6674 case EXIT_REASON_PREEMPTION_TIMER: 6675 return handle_fastpath_preemption_timer(vcpu); 6676 default: 6677 return EXIT_FASTPATH_NONE; 6678 } 6679 } 6680 6681 bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched); 6682 6683 static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu, 6684 struct vcpu_vmx *vmx) 6685 { 6686 /* 6687 * VMENTER enables interrupts (host state), but the kernel state is 6688 * interrupts disabled when this is invoked. Also tell RCU about 6689 * it. This is the same logic as for exit_to_user_mode(). 6690 * 6691 * This ensures that e.g. latency analysis on the host observes 6692 * guest mode as interrupt enabled. 6693 * 6694 * guest_enter_irqoff() informs context tracking about the 6695 * transition to guest mode and if enabled adjusts RCU state 6696 * accordingly. 6697 */ 6698 instrumentation_begin(); 6699 trace_hardirqs_on_prepare(); 6700 lockdep_hardirqs_on_prepare(CALLER_ADDR0); 6701 instrumentation_end(); 6702 6703 guest_enter_irqoff(); 6704 lockdep_hardirqs_on(CALLER_ADDR0); 6705 6706 /* L1D Flush includes CPU buffer clear to mitigate MDS */ 6707 if (static_branch_unlikely(&vmx_l1d_should_flush)) 6708 vmx_l1d_flush(vcpu); 6709 else if (static_branch_unlikely(&mds_user_clear)) 6710 mds_clear_cpu_buffers(); 6711 6712 if (vcpu->arch.cr2 != native_read_cr2()) 6713 native_write_cr2(vcpu->arch.cr2); 6714 6715 vmx->fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs, 6716 vmx->loaded_vmcs->launched); 6717 6718 vcpu->arch.cr2 = native_read_cr2(); 6719 6720 /* 6721 * VMEXIT disables interrupts (host state), but tracing and lockdep 6722 * have them in state 'on' as recorded before entering guest mode. 6723 * Same as enter_from_user_mode(). 6724 * 6725 * guest_exit_irqoff() restores host context and reinstates RCU if 6726 * enabled and required. 6727 * 6728 * This needs to be done before the below as native_read_msr() 6729 * contains a tracepoint and x86_spec_ctrl_restore_host() calls 6730 * into world and some more. 6731 */ 6732 lockdep_hardirqs_off(CALLER_ADDR0); 6733 guest_exit_irqoff(); 6734 6735 instrumentation_begin(); 6736 trace_hardirqs_off_finish(); 6737 instrumentation_end(); 6738 } 6739 6740 static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu) 6741 { 6742 fastpath_t exit_fastpath; 6743 struct vcpu_vmx *vmx = to_vmx(vcpu); 6744 unsigned long cr3, cr4; 6745 6746 reenter_guest: 6747 /* Record the guest's net vcpu time for enforced NMI injections. */ 6748 if (unlikely(!enable_vnmi && 6749 vmx->loaded_vmcs->soft_vnmi_blocked)) 6750 vmx->loaded_vmcs->entry_time = ktime_get(); 6751 6752 /* Don't enter VMX if guest state is invalid, let the exit handler 6753 start emulation until we arrive back to a valid state */ 6754 if (vmx->emulation_required) 6755 return EXIT_FASTPATH_NONE; 6756 6757 if (vmx->ple_window_dirty) { 6758 vmx->ple_window_dirty = false; 6759 vmcs_write32(PLE_WINDOW, vmx->ple_window); 6760 } 6761 6762 /* 6763 * We did this in prepare_switch_to_guest, because it needs to 6764 * be within srcu_read_lock. 6765 */ 6766 WARN_ON_ONCE(vmx->nested.need_vmcs12_to_shadow_sync); 6767 6768 if (kvm_register_is_dirty(vcpu, VCPU_REGS_RSP)) 6769 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); 6770 if (kvm_register_is_dirty(vcpu, VCPU_REGS_RIP)) 6771 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); 6772 6773 cr3 = __get_current_cr3_fast(); 6774 if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) { 6775 vmcs_writel(HOST_CR3, cr3); 6776 vmx->loaded_vmcs->host_state.cr3 = cr3; 6777 } 6778 6779 cr4 = cr4_read_shadow(); 6780 if (unlikely(cr4 != vmx->loaded_vmcs->host_state.cr4)) { 6781 vmcs_writel(HOST_CR4, cr4); 6782 vmx->loaded_vmcs->host_state.cr4 = cr4; 6783 } 6784 6785 /* When single-stepping over STI and MOV SS, we must clear the 6786 * corresponding interruptibility bits in the guest state. Otherwise 6787 * vmentry fails as it then expects bit 14 (BS) in pending debug 6788 * exceptions being set, but that's not correct for the guest debugging 6789 * case. */ 6790 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) 6791 vmx_set_interrupt_shadow(vcpu, 0); 6792 6793 kvm_load_guest_xsave_state(vcpu); 6794 6795 pt_guest_enter(vmx); 6796 6797 atomic_switch_perf_msrs(vmx); 6798 6799 if (enable_preemption_timer) 6800 vmx_update_hv_timer(vcpu); 6801 6802 if (lapic_in_kernel(vcpu) && 6803 vcpu->arch.apic->lapic_timer.timer_advance_ns) 6804 kvm_wait_lapic_expire(vcpu); 6805 6806 /* 6807 * If this vCPU has touched SPEC_CTRL, restore the guest's value if 6808 * it's non-zero. Since vmentry is serialising on affected CPUs, there 6809 * is no need to worry about the conditional branch over the wrmsr 6810 * being speculatively taken. 6811 */ 6812 x86_spec_ctrl_set_guest(vmx->spec_ctrl, 0); 6813 6814 /* The actual VMENTER/EXIT is in the .noinstr.text section. */ 6815 vmx_vcpu_enter_exit(vcpu, vmx); 6816 6817 /* 6818 * We do not use IBRS in the kernel. If this vCPU has used the 6819 * SPEC_CTRL MSR it may have left it on; save the value and 6820 * turn it off. This is much more efficient than blindly adding 6821 * it to the atomic save/restore list. Especially as the former 6822 * (Saving guest MSRs on vmexit) doesn't even exist in KVM. 6823 * 6824 * For non-nested case: 6825 * If the L01 MSR bitmap does not intercept the MSR, then we need to 6826 * save it. 6827 * 6828 * For nested case: 6829 * If the L02 MSR bitmap does not intercept the MSR, then we need to 6830 * save it. 6831 */ 6832 if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) 6833 vmx->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); 6834 6835 x86_spec_ctrl_restore_host(vmx->spec_ctrl, 0); 6836 6837 /* All fields are clean at this point */ 6838 if (static_branch_unlikely(&enable_evmcs)) 6839 current_evmcs->hv_clean_fields |= 6840 HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL; 6841 6842 if (static_branch_unlikely(&enable_evmcs)) 6843 current_evmcs->hv_vp_id = vcpu->arch.hyperv.vp_index; 6844 6845 /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */ 6846 if (vmx->host_debugctlmsr) 6847 update_debugctlmsr(vmx->host_debugctlmsr); 6848 6849 #ifndef CONFIG_X86_64 6850 /* 6851 * The sysexit path does not restore ds/es, so we must set them to 6852 * a reasonable value ourselves. 6853 * 6854 * We can't defer this to vmx_prepare_switch_to_host() since that 6855 * function may be executed in interrupt context, which saves and 6856 * restore segments around it, nullifying its effect. 6857 */ 6858 loadsegment(ds, __USER_DS); 6859 loadsegment(es, __USER_DS); 6860 #endif 6861 6862 vmx_register_cache_reset(vcpu); 6863 6864 pt_guest_exit(vmx); 6865 6866 kvm_load_host_xsave_state(vcpu); 6867 6868 vmx->nested.nested_run_pending = 0; 6869 vmx->idt_vectoring_info = 0; 6870 6871 if (unlikely(vmx->fail)) { 6872 vmx->exit_reason = 0xdead; 6873 return EXIT_FASTPATH_NONE; 6874 } 6875 6876 vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); 6877 if (unlikely((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)) 6878 kvm_machine_check(); 6879 6880 trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX); 6881 6882 if (unlikely(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) 6883 return EXIT_FASTPATH_NONE; 6884 6885 vmx->loaded_vmcs->launched = 1; 6886 vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); 6887 6888 vmx_recover_nmi_blocking(vmx); 6889 vmx_complete_interrupts(vmx); 6890 6891 if (is_guest_mode(vcpu)) 6892 return EXIT_FASTPATH_NONE; 6893 6894 exit_fastpath = vmx_exit_handlers_fastpath(vcpu); 6895 if (exit_fastpath == EXIT_FASTPATH_REENTER_GUEST) { 6896 if (!kvm_vcpu_exit_request(vcpu)) { 6897 /* 6898 * FIXME: this goto should be a loop in vcpu_enter_guest, 6899 * but it would incur the cost of a retpoline for now. 6900 * Revisit once static calls are available. 6901 */ 6902 if (vcpu->arch.apicv_active) 6903 vmx_sync_pir_to_irr(vcpu); 6904 goto reenter_guest; 6905 } 6906 exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED; 6907 } 6908 6909 return exit_fastpath; 6910 } 6911 6912 static void vmx_free_vcpu(struct kvm_vcpu *vcpu) 6913 { 6914 struct vcpu_vmx *vmx = to_vmx(vcpu); 6915 6916 if (enable_pml) 6917 vmx_destroy_pml_buffer(vmx); 6918 free_vpid(vmx->vpid); 6919 nested_vmx_free_vcpu(vcpu); 6920 free_loaded_vmcs(vmx->loaded_vmcs); 6921 } 6922 6923 static int vmx_create_vcpu(struct kvm_vcpu *vcpu) 6924 { 6925 struct vcpu_vmx *vmx; 6926 unsigned long *msr_bitmap; 6927 int i, cpu, err; 6928 6929 BUILD_BUG_ON(offsetof(struct vcpu_vmx, vcpu) != 0); 6930 vmx = to_vmx(vcpu); 6931 6932 err = -ENOMEM; 6933 6934 vmx->vpid = allocate_vpid(); 6935 6936 /* 6937 * If PML is turned on, failure on enabling PML just results in failure 6938 * of creating the vcpu, therefore we can simplify PML logic (by 6939 * avoiding dealing with cases, such as enabling PML partially on vcpus 6940 * for the guest), etc. 6941 */ 6942 if (enable_pml) { 6943 vmx->pml_pg = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); 6944 if (!vmx->pml_pg) 6945 goto free_vpid; 6946 } 6947 6948 BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) != NR_SHARED_MSRS); 6949 6950 for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) { 6951 u32 index = vmx_msr_index[i]; 6952 u32 data_low, data_high; 6953 int j = vmx->nmsrs; 6954 6955 if (rdmsr_safe(index, &data_low, &data_high) < 0) 6956 continue; 6957 if (wrmsr_safe(index, data_low, data_high) < 0) 6958 continue; 6959 6960 vmx->guest_msrs[j].index = i; 6961 vmx->guest_msrs[j].data = 0; 6962 switch (index) { 6963 case MSR_IA32_TSX_CTRL: 6964 /* 6965 * No need to pass TSX_CTRL_CPUID_CLEAR through, so 6966 * let's avoid changing CPUID bits under the host 6967 * kernel's feet. 6968 */ 6969 vmx->guest_msrs[j].mask = ~(u64)TSX_CTRL_CPUID_CLEAR; 6970 break; 6971 default: 6972 vmx->guest_msrs[j].mask = -1ull; 6973 break; 6974 } 6975 ++vmx->nmsrs; 6976 } 6977 6978 err = alloc_loaded_vmcs(&vmx->vmcs01); 6979 if (err < 0) 6980 goto free_pml; 6981 6982 msr_bitmap = vmx->vmcs01.msr_bitmap; 6983 vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_TSC, MSR_TYPE_R); 6984 vmx_disable_intercept_for_msr(msr_bitmap, MSR_FS_BASE, MSR_TYPE_RW); 6985 vmx_disable_intercept_for_msr(msr_bitmap, MSR_GS_BASE, MSR_TYPE_RW); 6986 vmx_disable_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW); 6987 vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW); 6988 vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW); 6989 vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW); 6990 if (kvm_cstate_in_guest(vcpu->kvm)) { 6991 vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C1_RES, MSR_TYPE_R); 6992 vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C3_RESIDENCY, MSR_TYPE_R); 6993 vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C6_RESIDENCY, MSR_TYPE_R); 6994 vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C7_RESIDENCY, MSR_TYPE_R); 6995 } 6996 vmx->msr_bitmap_mode = 0; 6997 6998 vmx->loaded_vmcs = &vmx->vmcs01; 6999 cpu = get_cpu(); 7000 vmx_vcpu_load(vcpu, cpu); 7001 vcpu->cpu = cpu; 7002 init_vmcs(vmx); 7003 vmx_vcpu_put(vcpu); 7004 put_cpu(); 7005 if (cpu_need_virtualize_apic_accesses(vcpu)) { 7006 err = alloc_apic_access_page(vcpu->kvm); 7007 if (err) 7008 goto free_vmcs; 7009 } 7010 7011 if (enable_ept && !enable_unrestricted_guest) { 7012 err = init_rmode_identity_map(vcpu->kvm); 7013 if (err) 7014 goto free_vmcs; 7015 } 7016 7017 if (nested) 7018 nested_vmx_setup_ctls_msrs(&vmx->nested.msrs, 7019 vmx_capability.ept); 7020 else 7021 memset(&vmx->nested.msrs, 0, sizeof(vmx->nested.msrs)); 7022 7023 vmx->nested.posted_intr_nv = -1; 7024 vmx->nested.current_vmptr = -1ull; 7025 7026 vcpu->arch.microcode_version = 0x100000000ULL; 7027 vmx->msr_ia32_feature_control_valid_bits = FEAT_CTL_LOCKED; 7028 7029 /* 7030 * Enforce invariant: pi_desc.nv is always either POSTED_INTR_VECTOR 7031 * or POSTED_INTR_WAKEUP_VECTOR. 7032 */ 7033 vmx->pi_desc.nv = POSTED_INTR_VECTOR; 7034 vmx->pi_desc.sn = 1; 7035 7036 vmx->ept_pointer = INVALID_PAGE; 7037 7038 return 0; 7039 7040 free_vmcs: 7041 free_loaded_vmcs(vmx->loaded_vmcs); 7042 free_pml: 7043 vmx_destroy_pml_buffer(vmx); 7044 free_vpid: 7045 free_vpid(vmx->vpid); 7046 return err; 7047 } 7048 7049 #define L1TF_MSG_SMT "L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.\n" 7050 #define L1TF_MSG_L1D "L1TF CPU bug present and virtualization mitigation disabled, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.\n" 7051 7052 static int vmx_vm_init(struct kvm *kvm) 7053 { 7054 spin_lock_init(&to_kvm_vmx(kvm)->ept_pointer_lock); 7055 7056 if (!ple_gap) 7057 kvm->arch.pause_in_guest = true; 7058 7059 if (boot_cpu_has(X86_BUG_L1TF) && enable_ept) { 7060 switch (l1tf_mitigation) { 7061 case L1TF_MITIGATION_OFF: 7062 case L1TF_MITIGATION_FLUSH_NOWARN: 7063 /* 'I explicitly don't care' is set */ 7064 break; 7065 case L1TF_MITIGATION_FLUSH: 7066 case L1TF_MITIGATION_FLUSH_NOSMT: 7067 case L1TF_MITIGATION_FULL: 7068 /* 7069 * Warn upon starting the first VM in a potentially 7070 * insecure environment. 7071 */ 7072 if (sched_smt_active()) 7073 pr_warn_once(L1TF_MSG_SMT); 7074 if (l1tf_vmx_mitigation == VMENTER_L1D_FLUSH_NEVER) 7075 pr_warn_once(L1TF_MSG_L1D); 7076 break; 7077 case L1TF_MITIGATION_FULL_FORCE: 7078 /* Flush is enforced */ 7079 break; 7080 } 7081 } 7082 kvm_apicv_init(kvm, enable_apicv); 7083 return 0; 7084 } 7085 7086 static int __init vmx_check_processor_compat(void) 7087 { 7088 struct vmcs_config vmcs_conf; 7089 struct vmx_capability vmx_cap; 7090 7091 if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || 7092 !this_cpu_has(X86_FEATURE_VMX)) { 7093 pr_err("kvm: VMX is disabled on CPU %d\n", smp_processor_id()); 7094 return -EIO; 7095 } 7096 7097 if (setup_vmcs_config(&vmcs_conf, &vmx_cap) < 0) 7098 return -EIO; 7099 if (nested) 7100 nested_vmx_setup_ctls_msrs(&vmcs_conf.nested, vmx_cap.ept); 7101 if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { 7102 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", 7103 smp_processor_id()); 7104 return -EIO; 7105 } 7106 return 0; 7107 } 7108 7109 static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) 7110 { 7111 u8 cache; 7112 u64 ipat = 0; 7113 7114 /* We wanted to honor guest CD/MTRR/PAT, but doing so could result in 7115 * memory aliases with conflicting memory types and sometimes MCEs. 7116 * We have to be careful as to what are honored and when. 7117 * 7118 * For MMIO, guest CD/MTRR are ignored. The EPT memory type is set to 7119 * UC. The effective memory type is UC or WC depending on guest PAT. 7120 * This was historically the source of MCEs and we want to be 7121 * conservative. 7122 * 7123 * When there is no need to deal with noncoherent DMA (e.g., no VT-d 7124 * or VT-d has snoop control), guest CD/MTRR/PAT are all ignored. The 7125 * EPT memory type is set to WB. The effective memory type is forced 7126 * WB. 7127 * 7128 * Otherwise, we trust guest. Guest CD/MTRR/PAT are all honored. The 7129 * EPT memory type is used to emulate guest CD/MTRR. 7130 */ 7131 7132 if (is_mmio) { 7133 cache = MTRR_TYPE_UNCACHABLE; 7134 goto exit; 7135 } 7136 7137 if (!kvm_arch_has_noncoherent_dma(vcpu->kvm)) { 7138 ipat = VMX_EPT_IPAT_BIT; 7139 cache = MTRR_TYPE_WRBACK; 7140 goto exit; 7141 } 7142 7143 if (kvm_read_cr0(vcpu) & X86_CR0_CD) { 7144 ipat = VMX_EPT_IPAT_BIT; 7145 if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) 7146 cache = MTRR_TYPE_WRBACK; 7147 else 7148 cache = MTRR_TYPE_UNCACHABLE; 7149 goto exit; 7150 } 7151 7152 cache = kvm_mtrr_get_guest_memory_type(vcpu, gfn); 7153 7154 exit: 7155 return (cache << VMX_EPT_MT_EPTE_SHIFT) | ipat; 7156 } 7157 7158 static void vmcs_set_secondary_exec_control(struct vcpu_vmx *vmx) 7159 { 7160 /* 7161 * These bits in the secondary execution controls field 7162 * are dynamic, the others are mostly based on the hypervisor 7163 * architecture and the guest's CPUID. Do not touch the 7164 * dynamic bits. 7165 */ 7166 u32 mask = 7167 SECONDARY_EXEC_SHADOW_VMCS | 7168 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | 7169 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | 7170 SECONDARY_EXEC_DESC; 7171 7172 u32 new_ctl = vmx->secondary_exec_control; 7173 u32 cur_ctl = secondary_exec_controls_get(vmx); 7174 7175 secondary_exec_controls_set(vmx, (new_ctl & ~mask) | (cur_ctl & mask)); 7176 } 7177 7178 /* 7179 * Generate MSR_IA32_VMX_CR{0,4}_FIXED1 according to CPUID. Only set bits 7180 * (indicating "allowed-1") if they are supported in the guest's CPUID. 7181 */ 7182 static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu) 7183 { 7184 struct vcpu_vmx *vmx = to_vmx(vcpu); 7185 struct kvm_cpuid_entry2 *entry; 7186 7187 vmx->nested.msrs.cr0_fixed1 = 0xffffffff; 7188 vmx->nested.msrs.cr4_fixed1 = X86_CR4_PCE; 7189 7190 #define cr4_fixed1_update(_cr4_mask, _reg, _cpuid_mask) do { \ 7191 if (entry && (entry->_reg & (_cpuid_mask))) \ 7192 vmx->nested.msrs.cr4_fixed1 |= (_cr4_mask); \ 7193 } while (0) 7194 7195 entry = kvm_find_cpuid_entry(vcpu, 0x1, 0); 7196 cr4_fixed1_update(X86_CR4_VME, edx, feature_bit(VME)); 7197 cr4_fixed1_update(X86_CR4_PVI, edx, feature_bit(VME)); 7198 cr4_fixed1_update(X86_CR4_TSD, edx, feature_bit(TSC)); 7199 cr4_fixed1_update(X86_CR4_DE, edx, feature_bit(DE)); 7200 cr4_fixed1_update(X86_CR4_PSE, edx, feature_bit(PSE)); 7201 cr4_fixed1_update(X86_CR4_PAE, edx, feature_bit(PAE)); 7202 cr4_fixed1_update(X86_CR4_MCE, edx, feature_bit(MCE)); 7203 cr4_fixed1_update(X86_CR4_PGE, edx, feature_bit(PGE)); 7204 cr4_fixed1_update(X86_CR4_OSFXSR, edx, feature_bit(FXSR)); 7205 cr4_fixed1_update(X86_CR4_OSXMMEXCPT, edx, feature_bit(XMM)); 7206 cr4_fixed1_update(X86_CR4_VMXE, ecx, feature_bit(VMX)); 7207 cr4_fixed1_update(X86_CR4_SMXE, ecx, feature_bit(SMX)); 7208 cr4_fixed1_update(X86_CR4_PCIDE, ecx, feature_bit(PCID)); 7209 cr4_fixed1_update(X86_CR4_OSXSAVE, ecx, feature_bit(XSAVE)); 7210 7211 entry = kvm_find_cpuid_entry(vcpu, 0x7, 0); 7212 cr4_fixed1_update(X86_CR4_FSGSBASE, ebx, feature_bit(FSGSBASE)); 7213 cr4_fixed1_update(X86_CR4_SMEP, ebx, feature_bit(SMEP)); 7214 cr4_fixed1_update(X86_CR4_SMAP, ebx, feature_bit(SMAP)); 7215 cr4_fixed1_update(X86_CR4_PKE, ecx, feature_bit(PKU)); 7216 cr4_fixed1_update(X86_CR4_UMIP, ecx, feature_bit(UMIP)); 7217 cr4_fixed1_update(X86_CR4_LA57, ecx, feature_bit(LA57)); 7218 7219 #undef cr4_fixed1_update 7220 } 7221 7222 static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu) 7223 { 7224 struct vcpu_vmx *vmx = to_vmx(vcpu); 7225 7226 if (kvm_mpx_supported()) { 7227 bool mpx_enabled = guest_cpuid_has(vcpu, X86_FEATURE_MPX); 7228 7229 if (mpx_enabled) { 7230 vmx->nested.msrs.entry_ctls_high |= VM_ENTRY_LOAD_BNDCFGS; 7231 vmx->nested.msrs.exit_ctls_high |= VM_EXIT_CLEAR_BNDCFGS; 7232 } else { 7233 vmx->nested.msrs.entry_ctls_high &= ~VM_ENTRY_LOAD_BNDCFGS; 7234 vmx->nested.msrs.exit_ctls_high &= ~VM_EXIT_CLEAR_BNDCFGS; 7235 } 7236 } 7237 } 7238 7239 static void update_intel_pt_cfg(struct kvm_vcpu *vcpu) 7240 { 7241 struct vcpu_vmx *vmx = to_vmx(vcpu); 7242 struct kvm_cpuid_entry2 *best = NULL; 7243 int i; 7244 7245 for (i = 0; i < PT_CPUID_LEAVES; i++) { 7246 best = kvm_find_cpuid_entry(vcpu, 0x14, i); 7247 if (!best) 7248 return; 7249 vmx->pt_desc.caps[CPUID_EAX + i*PT_CPUID_REGS_NUM] = best->eax; 7250 vmx->pt_desc.caps[CPUID_EBX + i*PT_CPUID_REGS_NUM] = best->ebx; 7251 vmx->pt_desc.caps[CPUID_ECX + i*PT_CPUID_REGS_NUM] = best->ecx; 7252 vmx->pt_desc.caps[CPUID_EDX + i*PT_CPUID_REGS_NUM] = best->edx; 7253 } 7254 7255 /* Get the number of configurable Address Ranges for filtering */ 7256 vmx->pt_desc.addr_range = intel_pt_validate_cap(vmx->pt_desc.caps, 7257 PT_CAP_num_address_ranges); 7258 7259 /* Initialize and clear the no dependency bits */ 7260 vmx->pt_desc.ctl_bitmask = ~(RTIT_CTL_TRACEEN | RTIT_CTL_OS | 7261 RTIT_CTL_USR | RTIT_CTL_TSC_EN | RTIT_CTL_DISRETC); 7262 7263 /* 7264 * If CPUID.(EAX=14H,ECX=0):EBX[0]=1 CR3Filter can be set otherwise 7265 * will inject an #GP 7266 */ 7267 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_cr3_filtering)) 7268 vmx->pt_desc.ctl_bitmask &= ~RTIT_CTL_CR3EN; 7269 7270 /* 7271 * If CPUID.(EAX=14H,ECX=0):EBX[1]=1 CYCEn, CycThresh and 7272 * PSBFreq can be set 7273 */ 7274 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_psb_cyc)) 7275 vmx->pt_desc.ctl_bitmask &= ~(RTIT_CTL_CYCLEACC | 7276 RTIT_CTL_CYC_THRESH | RTIT_CTL_PSB_FREQ); 7277 7278 /* 7279 * If CPUID.(EAX=14H,ECX=0):EBX[3]=1 MTCEn BranchEn and 7280 * MTCFreq can be set 7281 */ 7282 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_mtc)) 7283 vmx->pt_desc.ctl_bitmask &= ~(RTIT_CTL_MTC_EN | 7284 RTIT_CTL_BRANCH_EN | RTIT_CTL_MTC_RANGE); 7285 7286 /* If CPUID.(EAX=14H,ECX=0):EBX[4]=1 FUPonPTW and PTWEn can be set */ 7287 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_ptwrite)) 7288 vmx->pt_desc.ctl_bitmask &= ~(RTIT_CTL_FUP_ON_PTW | 7289 RTIT_CTL_PTW_EN); 7290 7291 /* If CPUID.(EAX=14H,ECX=0):EBX[5]=1 PwrEvEn can be set */ 7292 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_power_event_trace)) 7293 vmx->pt_desc.ctl_bitmask &= ~RTIT_CTL_PWR_EVT_EN; 7294 7295 /* If CPUID.(EAX=14H,ECX=0):ECX[0]=1 ToPA can be set */ 7296 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_topa_output)) 7297 vmx->pt_desc.ctl_bitmask &= ~RTIT_CTL_TOPA; 7298 7299 /* If CPUID.(EAX=14H,ECX=0):ECX[3]=1 FabircEn can be set */ 7300 if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_output_subsys)) 7301 vmx->pt_desc.ctl_bitmask &= ~RTIT_CTL_FABRIC_EN; 7302 7303 /* unmask address range configure area */ 7304 for (i = 0; i < vmx->pt_desc.addr_range; i++) 7305 vmx->pt_desc.ctl_bitmask &= ~(0xfULL << (32 + i * 4)); 7306 } 7307 7308 static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) 7309 { 7310 struct vcpu_vmx *vmx = to_vmx(vcpu); 7311 7312 /* xsaves_enabled is recomputed in vmx_compute_secondary_exec_control(). */ 7313 vcpu->arch.xsaves_enabled = false; 7314 7315 if (cpu_has_secondary_exec_ctrls()) { 7316 vmx_compute_secondary_exec_control(vmx); 7317 vmcs_set_secondary_exec_control(vmx); 7318 } 7319 7320 if (nested_vmx_allowed(vcpu)) 7321 to_vmx(vcpu)->msr_ia32_feature_control_valid_bits |= 7322 FEAT_CTL_VMX_ENABLED_INSIDE_SMX | 7323 FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX; 7324 else 7325 to_vmx(vcpu)->msr_ia32_feature_control_valid_bits &= 7326 ~(FEAT_CTL_VMX_ENABLED_INSIDE_SMX | 7327 FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX); 7328 7329 if (nested_vmx_allowed(vcpu)) { 7330 nested_vmx_cr_fixed1_bits_update(vcpu); 7331 nested_vmx_entry_exit_ctls_update(vcpu); 7332 } 7333 7334 if (boot_cpu_has(X86_FEATURE_INTEL_PT) && 7335 guest_cpuid_has(vcpu, X86_FEATURE_INTEL_PT)) 7336 update_intel_pt_cfg(vcpu); 7337 7338 if (boot_cpu_has(X86_FEATURE_RTM)) { 7339 struct shared_msr_entry *msr; 7340 msr = find_msr_entry(vmx, MSR_IA32_TSX_CTRL); 7341 if (msr) { 7342 bool enabled = guest_cpuid_has(vcpu, X86_FEATURE_RTM); 7343 vmx_set_guest_msr(vmx, msr, enabled ? 0 : TSX_CTRL_RTM_DISABLE); 7344 } 7345 } 7346 } 7347 7348 static __init void vmx_set_cpu_caps(void) 7349 { 7350 kvm_set_cpu_caps(); 7351 7352 /* CPUID 0x1 */ 7353 if (nested) 7354 kvm_cpu_cap_set(X86_FEATURE_VMX); 7355 7356 /* CPUID 0x7 */ 7357 if (kvm_mpx_supported()) 7358 kvm_cpu_cap_check_and_set(X86_FEATURE_MPX); 7359 if (cpu_has_vmx_invpcid()) 7360 kvm_cpu_cap_check_and_set(X86_FEATURE_INVPCID); 7361 if (vmx_pt_mode_is_host_guest()) 7362 kvm_cpu_cap_check_and_set(X86_FEATURE_INTEL_PT); 7363 7364 if (vmx_umip_emulated()) 7365 kvm_cpu_cap_set(X86_FEATURE_UMIP); 7366 7367 /* CPUID 0xD.1 */ 7368 supported_xss = 0; 7369 if (!vmx_xsaves_supported()) 7370 kvm_cpu_cap_clear(X86_FEATURE_XSAVES); 7371 7372 /* CPUID 0x80000001 */ 7373 if (!cpu_has_vmx_rdtscp()) 7374 kvm_cpu_cap_clear(X86_FEATURE_RDTSCP); 7375 7376 if (vmx_waitpkg_supported()) 7377 kvm_cpu_cap_check_and_set(X86_FEATURE_WAITPKG); 7378 } 7379 7380 static void vmx_request_immediate_exit(struct kvm_vcpu *vcpu) 7381 { 7382 to_vmx(vcpu)->req_immediate_exit = true; 7383 } 7384 7385 static int vmx_check_intercept_io(struct kvm_vcpu *vcpu, 7386 struct x86_instruction_info *info) 7387 { 7388 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 7389 unsigned short port; 7390 bool intercept; 7391 int size; 7392 7393 if (info->intercept == x86_intercept_in || 7394 info->intercept == x86_intercept_ins) { 7395 port = info->src_val; 7396 size = info->dst_bytes; 7397 } else { 7398 port = info->dst_val; 7399 size = info->src_bytes; 7400 } 7401 7402 /* 7403 * If the 'use IO bitmaps' VM-execution control is 0, IO instruction 7404 * VM-exits depend on the 'unconditional IO exiting' VM-execution 7405 * control. 7406 * 7407 * Otherwise, IO instruction VM-exits are controlled by the IO bitmaps. 7408 */ 7409 if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS)) 7410 intercept = nested_cpu_has(vmcs12, 7411 CPU_BASED_UNCOND_IO_EXITING); 7412 else 7413 intercept = nested_vmx_check_io_bitmaps(vcpu, port, size); 7414 7415 /* FIXME: produce nested vmexit and return X86EMUL_INTERCEPTED. */ 7416 return intercept ? X86EMUL_UNHANDLEABLE : X86EMUL_CONTINUE; 7417 } 7418 7419 static int vmx_check_intercept(struct kvm_vcpu *vcpu, 7420 struct x86_instruction_info *info, 7421 enum x86_intercept_stage stage, 7422 struct x86_exception *exception) 7423 { 7424 struct vmcs12 *vmcs12 = get_vmcs12(vcpu); 7425 7426 switch (info->intercept) { 7427 /* 7428 * RDPID causes #UD if disabled through secondary execution controls. 7429 * Because it is marked as EmulateOnUD, we need to intercept it here. 7430 */ 7431 case x86_intercept_rdtscp: 7432 if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDTSCP)) { 7433 exception->vector = UD_VECTOR; 7434 exception->error_code_valid = false; 7435 return X86EMUL_PROPAGATE_FAULT; 7436 } 7437 break; 7438 7439 case x86_intercept_in: 7440 case x86_intercept_ins: 7441 case x86_intercept_out: 7442 case x86_intercept_outs: 7443 return vmx_check_intercept_io(vcpu, info); 7444 7445 case x86_intercept_lgdt: 7446 case x86_intercept_lidt: 7447 case x86_intercept_lldt: 7448 case x86_intercept_ltr: 7449 case x86_intercept_sgdt: 7450 case x86_intercept_sidt: 7451 case x86_intercept_sldt: 7452 case x86_intercept_str: 7453 if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_DESC)) 7454 return X86EMUL_CONTINUE; 7455 7456 /* FIXME: produce nested vmexit and return X86EMUL_INTERCEPTED. */ 7457 break; 7458 7459 /* TODO: check more intercepts... */ 7460 default: 7461 break; 7462 } 7463 7464 return X86EMUL_UNHANDLEABLE; 7465 } 7466 7467 #ifdef CONFIG_X86_64 7468 /* (a << shift) / divisor, return 1 if overflow otherwise 0 */ 7469 static inline int u64_shl_div_u64(u64 a, unsigned int shift, 7470 u64 divisor, u64 *result) 7471 { 7472 u64 low = a << shift, high = a >> (64 - shift); 7473 7474 /* To avoid the overflow on divq */ 7475 if (high >= divisor) 7476 return 1; 7477 7478 /* Low hold the result, high hold rem which is discarded */ 7479 asm("divq %2\n\t" : "=a" (low), "=d" (high) : 7480 "rm" (divisor), "0" (low), "1" (high)); 7481 *result = low; 7482 7483 return 0; 7484 } 7485 7486 static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc, 7487 bool *expired) 7488 { 7489 struct vcpu_vmx *vmx; 7490 u64 tscl, guest_tscl, delta_tsc, lapic_timer_advance_cycles; 7491 struct kvm_timer *ktimer = &vcpu->arch.apic->lapic_timer; 7492 7493 vmx = to_vmx(vcpu); 7494 tscl = rdtsc(); 7495 guest_tscl = kvm_read_l1_tsc(vcpu, tscl); 7496 delta_tsc = max(guest_deadline_tsc, guest_tscl) - guest_tscl; 7497 lapic_timer_advance_cycles = nsec_to_cycles(vcpu, 7498 ktimer->timer_advance_ns); 7499 7500 if (delta_tsc > lapic_timer_advance_cycles) 7501 delta_tsc -= lapic_timer_advance_cycles; 7502 else 7503 delta_tsc = 0; 7504 7505 /* Convert to host delta tsc if tsc scaling is enabled */ 7506 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio && 7507 delta_tsc && u64_shl_div_u64(delta_tsc, 7508 kvm_tsc_scaling_ratio_frac_bits, 7509 vcpu->arch.tsc_scaling_ratio, &delta_tsc)) 7510 return -ERANGE; 7511 7512 /* 7513 * If the delta tsc can't fit in the 32 bit after the multi shift, 7514 * we can't use the preemption timer. 7515 * It's possible that it fits on later vmentries, but checking 7516 * on every vmentry is costly so we just use an hrtimer. 7517 */ 7518 if (delta_tsc >> (cpu_preemption_timer_multi + 32)) 7519 return -ERANGE; 7520 7521 vmx->hv_deadline_tsc = tscl + delta_tsc; 7522 *expired = !delta_tsc; 7523 return 0; 7524 } 7525 7526 static void vmx_cancel_hv_timer(struct kvm_vcpu *vcpu) 7527 { 7528 to_vmx(vcpu)->hv_deadline_tsc = -1; 7529 } 7530 #endif 7531 7532 static void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu) 7533 { 7534 if (!kvm_pause_in_guest(vcpu->kvm)) 7535 shrink_ple_window(vcpu); 7536 } 7537 7538 static void vmx_slot_enable_log_dirty(struct kvm *kvm, 7539 struct kvm_memory_slot *slot) 7540 { 7541 if (!kvm_dirty_log_manual_protect_and_init_set(kvm)) 7542 kvm_mmu_slot_leaf_clear_dirty(kvm, slot); 7543 kvm_mmu_slot_largepage_remove_write_access(kvm, slot); 7544 } 7545 7546 static void vmx_slot_disable_log_dirty(struct kvm *kvm, 7547 struct kvm_memory_slot *slot) 7548 { 7549 kvm_mmu_slot_set_dirty(kvm, slot); 7550 } 7551 7552 static void vmx_flush_log_dirty(struct kvm *kvm) 7553 { 7554 kvm_flush_pml_buffers(kvm); 7555 } 7556 7557 static void vmx_enable_log_dirty_pt_masked(struct kvm *kvm, 7558 struct kvm_memory_slot *memslot, 7559 gfn_t offset, unsigned long mask) 7560 { 7561 kvm_mmu_clear_dirty_pt_masked(kvm, memslot, offset, mask); 7562 } 7563 7564 static void __pi_post_block(struct kvm_vcpu *vcpu) 7565 { 7566 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 7567 struct pi_desc old, new; 7568 unsigned int dest; 7569 7570 do { 7571 old.control = new.control = pi_desc->control; 7572 WARN(old.nv != POSTED_INTR_WAKEUP_VECTOR, 7573 "Wakeup handler not enabled while the VCPU is blocked\n"); 7574 7575 dest = cpu_physical_id(vcpu->cpu); 7576 7577 if (x2apic_enabled()) 7578 new.ndst = dest; 7579 else 7580 new.ndst = (dest << 8) & 0xFF00; 7581 7582 /* set 'NV' to 'notification vector' */ 7583 new.nv = POSTED_INTR_VECTOR; 7584 } while (cmpxchg64(&pi_desc->control, old.control, 7585 new.control) != old.control); 7586 7587 if (!WARN_ON_ONCE(vcpu->pre_pcpu == -1)) { 7588 spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); 7589 list_del(&vcpu->blocked_vcpu_list); 7590 spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); 7591 vcpu->pre_pcpu = -1; 7592 } 7593 } 7594 7595 /* 7596 * This routine does the following things for vCPU which is going 7597 * to be blocked if VT-d PI is enabled. 7598 * - Store the vCPU to the wakeup list, so when interrupts happen 7599 * we can find the right vCPU to wake up. 7600 * - Change the Posted-interrupt descriptor as below: 7601 * 'NDST' <-- vcpu->pre_pcpu 7602 * 'NV' <-- POSTED_INTR_WAKEUP_VECTOR 7603 * - If 'ON' is set during this process, which means at least one 7604 * interrupt is posted for this vCPU, we cannot block it, in 7605 * this case, return 1, otherwise, return 0. 7606 * 7607 */ 7608 static int pi_pre_block(struct kvm_vcpu *vcpu) 7609 { 7610 unsigned int dest; 7611 struct pi_desc old, new; 7612 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 7613 7614 if (!kvm_arch_has_assigned_device(vcpu->kvm) || 7615 !irq_remapping_cap(IRQ_POSTING_CAP) || 7616 !kvm_vcpu_apicv_active(vcpu)) 7617 return 0; 7618 7619 WARN_ON(irqs_disabled()); 7620 local_irq_disable(); 7621 if (!WARN_ON_ONCE(vcpu->pre_pcpu != -1)) { 7622 vcpu->pre_pcpu = vcpu->cpu; 7623 spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); 7624 list_add_tail(&vcpu->blocked_vcpu_list, 7625 &per_cpu(blocked_vcpu_on_cpu, 7626 vcpu->pre_pcpu)); 7627 spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); 7628 } 7629 7630 do { 7631 old.control = new.control = pi_desc->control; 7632 7633 WARN((pi_desc->sn == 1), 7634 "Warning: SN field of posted-interrupts " 7635 "is set before blocking\n"); 7636 7637 /* 7638 * Since vCPU can be preempted during this process, 7639 * vcpu->cpu could be different with pre_pcpu, we 7640 * need to set pre_pcpu as the destination of wakeup 7641 * notification event, then we can find the right vCPU 7642 * to wakeup in wakeup handler if interrupts happen 7643 * when the vCPU is in blocked state. 7644 */ 7645 dest = cpu_physical_id(vcpu->pre_pcpu); 7646 7647 if (x2apic_enabled()) 7648 new.ndst = dest; 7649 else 7650 new.ndst = (dest << 8) & 0xFF00; 7651 7652 /* set 'NV' to 'wakeup vector' */ 7653 new.nv = POSTED_INTR_WAKEUP_VECTOR; 7654 } while (cmpxchg64(&pi_desc->control, old.control, 7655 new.control) != old.control); 7656 7657 /* We should not block the vCPU if an interrupt is posted for it. */ 7658 if (pi_test_on(pi_desc) == 1) 7659 __pi_post_block(vcpu); 7660 7661 local_irq_enable(); 7662 return (vcpu->pre_pcpu == -1); 7663 } 7664 7665 static int vmx_pre_block(struct kvm_vcpu *vcpu) 7666 { 7667 if (pi_pre_block(vcpu)) 7668 return 1; 7669 7670 if (kvm_lapic_hv_timer_in_use(vcpu)) 7671 kvm_lapic_switch_to_sw_timer(vcpu); 7672 7673 return 0; 7674 } 7675 7676 static void pi_post_block(struct kvm_vcpu *vcpu) 7677 { 7678 if (vcpu->pre_pcpu == -1) 7679 return; 7680 7681 WARN_ON(irqs_disabled()); 7682 local_irq_disable(); 7683 __pi_post_block(vcpu); 7684 local_irq_enable(); 7685 } 7686 7687 static void vmx_post_block(struct kvm_vcpu *vcpu) 7688 { 7689 if (kvm_x86_ops.set_hv_timer) 7690 kvm_lapic_switch_to_hv_timer(vcpu); 7691 7692 pi_post_block(vcpu); 7693 } 7694 7695 /* 7696 * vmx_update_pi_irte - set IRTE for Posted-Interrupts 7697 * 7698 * @kvm: kvm 7699 * @host_irq: host irq of the interrupt 7700 * @guest_irq: gsi of the interrupt 7701 * @set: set or unset PI 7702 * returns 0 on success, < 0 on failure 7703 */ 7704 static int vmx_update_pi_irte(struct kvm *kvm, unsigned int host_irq, 7705 uint32_t guest_irq, bool set) 7706 { 7707 struct kvm_kernel_irq_routing_entry *e; 7708 struct kvm_irq_routing_table *irq_rt; 7709 struct kvm_lapic_irq irq; 7710 struct kvm_vcpu *vcpu; 7711 struct vcpu_data vcpu_info; 7712 int idx, ret = 0; 7713 7714 if (!kvm_arch_has_assigned_device(kvm) || 7715 !irq_remapping_cap(IRQ_POSTING_CAP) || 7716 !kvm_vcpu_apicv_active(kvm->vcpus[0])) 7717 return 0; 7718 7719 idx = srcu_read_lock(&kvm->irq_srcu); 7720 irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); 7721 if (guest_irq >= irq_rt->nr_rt_entries || 7722 hlist_empty(&irq_rt->map[guest_irq])) { 7723 pr_warn_once("no route for guest_irq %u/%u (broken user space?)\n", 7724 guest_irq, irq_rt->nr_rt_entries); 7725 goto out; 7726 } 7727 7728 hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) { 7729 if (e->type != KVM_IRQ_ROUTING_MSI) 7730 continue; 7731 /* 7732 * VT-d PI cannot support posting multicast/broadcast 7733 * interrupts to a vCPU, we still use interrupt remapping 7734 * for these kind of interrupts. 7735 * 7736 * For lowest-priority interrupts, we only support 7737 * those with single CPU as the destination, e.g. user 7738 * configures the interrupts via /proc/irq or uses 7739 * irqbalance to make the interrupts single-CPU. 7740 * 7741 * We will support full lowest-priority interrupt later. 7742 * 7743 * In addition, we can only inject generic interrupts using 7744 * the PI mechanism, refuse to route others through it. 7745 */ 7746 7747 kvm_set_msi_irq(kvm, e, &irq); 7748 if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu) || 7749 !kvm_irq_is_postable(&irq)) { 7750 /* 7751 * Make sure the IRTE is in remapped mode if 7752 * we don't handle it in posted mode. 7753 */ 7754 ret = irq_set_vcpu_affinity(host_irq, NULL); 7755 if (ret < 0) { 7756 printk(KERN_INFO 7757 "failed to back to remapped mode, irq: %u\n", 7758 host_irq); 7759 goto out; 7760 } 7761 7762 continue; 7763 } 7764 7765 vcpu_info.pi_desc_addr = __pa(vcpu_to_pi_desc(vcpu)); 7766 vcpu_info.vector = irq.vector; 7767 7768 trace_kvm_pi_irte_update(host_irq, vcpu->vcpu_id, e->gsi, 7769 vcpu_info.vector, vcpu_info.pi_desc_addr, set); 7770 7771 if (set) 7772 ret = irq_set_vcpu_affinity(host_irq, &vcpu_info); 7773 else 7774 ret = irq_set_vcpu_affinity(host_irq, NULL); 7775 7776 if (ret < 0) { 7777 printk(KERN_INFO "%s: failed to update PI IRTE\n", 7778 __func__); 7779 goto out; 7780 } 7781 } 7782 7783 ret = 0; 7784 out: 7785 srcu_read_unlock(&kvm->irq_srcu, idx); 7786 return ret; 7787 } 7788 7789 static void vmx_setup_mce(struct kvm_vcpu *vcpu) 7790 { 7791 if (vcpu->arch.mcg_cap & MCG_LMCE_P) 7792 to_vmx(vcpu)->msr_ia32_feature_control_valid_bits |= 7793 FEAT_CTL_LMCE_ENABLED; 7794 else 7795 to_vmx(vcpu)->msr_ia32_feature_control_valid_bits &= 7796 ~FEAT_CTL_LMCE_ENABLED; 7797 } 7798 7799 static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) 7800 { 7801 /* we need a nested vmexit to enter SMM, postpone if run is pending */ 7802 if (to_vmx(vcpu)->nested.nested_run_pending) 7803 return -EBUSY; 7804 return !is_smm(vcpu); 7805 } 7806 7807 static int vmx_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate) 7808 { 7809 struct vcpu_vmx *vmx = to_vmx(vcpu); 7810 7811 vmx->nested.smm.guest_mode = is_guest_mode(vcpu); 7812 if (vmx->nested.smm.guest_mode) 7813 nested_vmx_vmexit(vcpu, -1, 0, 0); 7814 7815 vmx->nested.smm.vmxon = vmx->nested.vmxon; 7816 vmx->nested.vmxon = false; 7817 vmx_clear_hlt(vcpu); 7818 return 0; 7819 } 7820 7821 static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) 7822 { 7823 struct vcpu_vmx *vmx = to_vmx(vcpu); 7824 int ret; 7825 7826 if (vmx->nested.smm.vmxon) { 7827 vmx->nested.vmxon = true; 7828 vmx->nested.smm.vmxon = false; 7829 } 7830 7831 if (vmx->nested.smm.guest_mode) { 7832 ret = nested_vmx_enter_non_root_mode(vcpu, false); 7833 if (ret) 7834 return ret; 7835 7836 vmx->nested.smm.guest_mode = false; 7837 } 7838 return 0; 7839 } 7840 7841 static void enable_smi_window(struct kvm_vcpu *vcpu) 7842 { 7843 /* RSM will cause a vmexit anyway. */ 7844 } 7845 7846 static bool vmx_need_emulation_on_page_fault(struct kvm_vcpu *vcpu) 7847 { 7848 return false; 7849 } 7850 7851 static bool vmx_apic_init_signal_blocked(struct kvm_vcpu *vcpu) 7852 { 7853 return to_vmx(vcpu)->nested.vmxon; 7854 } 7855 7856 static void vmx_migrate_timers(struct kvm_vcpu *vcpu) 7857 { 7858 if (is_guest_mode(vcpu)) { 7859 struct hrtimer *timer = &to_vmx(vcpu)->nested.preemption_timer; 7860 7861 if (hrtimer_try_to_cancel(timer) == 1) 7862 hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED); 7863 } 7864 } 7865 7866 static void hardware_unsetup(void) 7867 { 7868 if (nested) 7869 nested_vmx_hardware_unsetup(); 7870 7871 free_kvm_area(); 7872 } 7873 7874 static bool vmx_check_apicv_inhibit_reasons(ulong bit) 7875 { 7876 ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) | 7877 BIT(APICV_INHIBIT_REASON_HYPERV); 7878 7879 return supported & BIT(bit); 7880 } 7881 7882 static struct kvm_x86_ops vmx_x86_ops __initdata = { 7883 .hardware_unsetup = hardware_unsetup, 7884 7885 .hardware_enable = hardware_enable, 7886 .hardware_disable = hardware_disable, 7887 .cpu_has_accelerated_tpr = report_flexpriority, 7888 .has_emulated_msr = vmx_has_emulated_msr, 7889 7890 .vm_size = sizeof(struct kvm_vmx), 7891 .vm_init = vmx_vm_init, 7892 7893 .vcpu_create = vmx_create_vcpu, 7894 .vcpu_free = vmx_free_vcpu, 7895 .vcpu_reset = vmx_vcpu_reset, 7896 7897 .prepare_guest_switch = vmx_prepare_switch_to_guest, 7898 .vcpu_load = vmx_vcpu_load, 7899 .vcpu_put = vmx_vcpu_put, 7900 7901 .update_exception_bitmap = update_exception_bitmap, 7902 .get_msr_feature = vmx_get_msr_feature, 7903 .get_msr = vmx_get_msr, 7904 .set_msr = vmx_set_msr, 7905 .get_segment_base = vmx_get_segment_base, 7906 .get_segment = vmx_get_segment, 7907 .set_segment = vmx_set_segment, 7908 .get_cpl = vmx_get_cpl, 7909 .get_cs_db_l_bits = vmx_get_cs_db_l_bits, 7910 .set_cr0 = vmx_set_cr0, 7911 .set_cr4 = vmx_set_cr4, 7912 .set_efer = vmx_set_efer, 7913 .get_idt = vmx_get_idt, 7914 .set_idt = vmx_set_idt, 7915 .get_gdt = vmx_get_gdt, 7916 .set_gdt = vmx_set_gdt, 7917 .set_dr7 = vmx_set_dr7, 7918 .sync_dirty_debug_regs = vmx_sync_dirty_debug_regs, 7919 .cache_reg = vmx_cache_reg, 7920 .get_rflags = vmx_get_rflags, 7921 .set_rflags = vmx_set_rflags, 7922 7923 .tlb_flush_all = vmx_flush_tlb_all, 7924 .tlb_flush_current = vmx_flush_tlb_current, 7925 .tlb_flush_gva = vmx_flush_tlb_gva, 7926 .tlb_flush_guest = vmx_flush_tlb_guest, 7927 7928 .run = vmx_vcpu_run, 7929 .handle_exit = vmx_handle_exit, 7930 .skip_emulated_instruction = vmx_skip_emulated_instruction, 7931 .update_emulated_instruction = vmx_update_emulated_instruction, 7932 .set_interrupt_shadow = vmx_set_interrupt_shadow, 7933 .get_interrupt_shadow = vmx_get_interrupt_shadow, 7934 .patch_hypercall = vmx_patch_hypercall, 7935 .set_irq = vmx_inject_irq, 7936 .set_nmi = vmx_inject_nmi, 7937 .queue_exception = vmx_queue_exception, 7938 .cancel_injection = vmx_cancel_injection, 7939 .interrupt_allowed = vmx_interrupt_allowed, 7940 .nmi_allowed = vmx_nmi_allowed, 7941 .get_nmi_mask = vmx_get_nmi_mask, 7942 .set_nmi_mask = vmx_set_nmi_mask, 7943 .enable_nmi_window = enable_nmi_window, 7944 .enable_irq_window = enable_irq_window, 7945 .update_cr8_intercept = update_cr8_intercept, 7946 .set_virtual_apic_mode = vmx_set_virtual_apic_mode, 7947 .set_apic_access_page_addr = vmx_set_apic_access_page_addr, 7948 .refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl, 7949 .load_eoi_exitmap = vmx_load_eoi_exitmap, 7950 .apicv_post_state_restore = vmx_apicv_post_state_restore, 7951 .check_apicv_inhibit_reasons = vmx_check_apicv_inhibit_reasons, 7952 .hwapic_irr_update = vmx_hwapic_irr_update, 7953 .hwapic_isr_update = vmx_hwapic_isr_update, 7954 .guest_apic_has_interrupt = vmx_guest_apic_has_interrupt, 7955 .sync_pir_to_irr = vmx_sync_pir_to_irr, 7956 .deliver_posted_interrupt = vmx_deliver_posted_interrupt, 7957 .dy_apicv_has_pending_interrupt = vmx_dy_apicv_has_pending_interrupt, 7958 7959 .set_tss_addr = vmx_set_tss_addr, 7960 .set_identity_map_addr = vmx_set_identity_map_addr, 7961 .get_mt_mask = vmx_get_mt_mask, 7962 7963 .get_exit_info = vmx_get_exit_info, 7964 7965 .vcpu_after_set_cpuid = vmx_vcpu_after_set_cpuid, 7966 7967 .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit, 7968 7969 .write_l1_tsc_offset = vmx_write_l1_tsc_offset, 7970 7971 .load_mmu_pgd = vmx_load_mmu_pgd, 7972 7973 .check_intercept = vmx_check_intercept, 7974 .handle_exit_irqoff = vmx_handle_exit_irqoff, 7975 7976 .request_immediate_exit = vmx_request_immediate_exit, 7977 7978 .sched_in = vmx_sched_in, 7979 7980 .slot_enable_log_dirty = vmx_slot_enable_log_dirty, 7981 .slot_disable_log_dirty = vmx_slot_disable_log_dirty, 7982 .flush_log_dirty = vmx_flush_log_dirty, 7983 .enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked, 7984 7985 .pre_block = vmx_pre_block, 7986 .post_block = vmx_post_block, 7987 7988 .pmu_ops = &intel_pmu_ops, 7989 .nested_ops = &vmx_nested_ops, 7990 7991 .update_pi_irte = vmx_update_pi_irte, 7992 7993 #ifdef CONFIG_X86_64 7994 .set_hv_timer = vmx_set_hv_timer, 7995 .cancel_hv_timer = vmx_cancel_hv_timer, 7996 #endif 7997 7998 .setup_mce = vmx_setup_mce, 7999 8000 .smi_allowed = vmx_smi_allowed, 8001 .pre_enter_smm = vmx_pre_enter_smm, 8002 .pre_leave_smm = vmx_pre_leave_smm, 8003 .enable_smi_window = enable_smi_window, 8004 8005 .need_emulation_on_page_fault = vmx_need_emulation_on_page_fault, 8006 .apic_init_signal_blocked = vmx_apic_init_signal_blocked, 8007 .migrate_timers = vmx_migrate_timers, 8008 }; 8009 8010 static __init int hardware_setup(void) 8011 { 8012 unsigned long host_bndcfgs; 8013 struct desc_ptr dt; 8014 int r, i, ept_lpage_level; 8015 8016 store_idt(&dt); 8017 host_idt_base = dt.address; 8018 8019 for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) 8020 kvm_define_shared_msr(i, vmx_msr_index[i]); 8021 8022 if (setup_vmcs_config(&vmcs_config, &vmx_capability) < 0) 8023 return -EIO; 8024 8025 if (boot_cpu_has(X86_FEATURE_NX)) 8026 kvm_enable_efer_bits(EFER_NX); 8027 8028 if (boot_cpu_has(X86_FEATURE_MPX)) { 8029 rdmsrl(MSR_IA32_BNDCFGS, host_bndcfgs); 8030 WARN_ONCE(host_bndcfgs, "KVM: BNDCFGS in host will be lost"); 8031 } 8032 8033 if (!cpu_has_vmx_mpx()) 8034 supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS | 8035 XFEATURE_MASK_BNDCSR); 8036 8037 if (!cpu_has_vmx_vpid() || !cpu_has_vmx_invvpid() || 8038 !(cpu_has_vmx_invvpid_single() || cpu_has_vmx_invvpid_global())) 8039 enable_vpid = 0; 8040 8041 if (!cpu_has_vmx_ept() || 8042 !cpu_has_vmx_ept_4levels() || 8043 !cpu_has_vmx_ept_mt_wb() || 8044 !cpu_has_vmx_invept_global()) 8045 enable_ept = 0; 8046 8047 if (!cpu_has_vmx_ept_ad_bits() || !enable_ept) 8048 enable_ept_ad_bits = 0; 8049 8050 if (!cpu_has_vmx_unrestricted_guest() || !enable_ept) 8051 enable_unrestricted_guest = 0; 8052 8053 if (!cpu_has_vmx_flexpriority()) 8054 flexpriority_enabled = 0; 8055 8056 if (!cpu_has_virtual_nmis()) 8057 enable_vnmi = 0; 8058 8059 /* 8060 * set_apic_access_page_addr() is used to reload apic access 8061 * page upon invalidation. No need to do anything if not 8062 * using the APIC_ACCESS_ADDR VMCS field. 8063 */ 8064 if (!flexpriority_enabled) 8065 vmx_x86_ops.set_apic_access_page_addr = NULL; 8066 8067 if (!cpu_has_vmx_tpr_shadow()) 8068 vmx_x86_ops.update_cr8_intercept = NULL; 8069 8070 #if IS_ENABLED(CONFIG_HYPERV) 8071 if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH 8072 && enable_ept) { 8073 vmx_x86_ops.tlb_remote_flush = hv_remote_flush_tlb; 8074 vmx_x86_ops.tlb_remote_flush_with_range = 8075 hv_remote_flush_tlb_with_range; 8076 } 8077 #endif 8078 8079 if (!cpu_has_vmx_ple()) { 8080 ple_gap = 0; 8081 ple_window = 0; 8082 ple_window_grow = 0; 8083 ple_window_max = 0; 8084 ple_window_shrink = 0; 8085 } 8086 8087 if (!cpu_has_vmx_apicv()) { 8088 enable_apicv = 0; 8089 vmx_x86_ops.sync_pir_to_irr = NULL; 8090 } 8091 8092 if (cpu_has_vmx_tsc_scaling()) { 8093 kvm_has_tsc_control = true; 8094 kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX; 8095 kvm_tsc_scaling_ratio_frac_bits = 48; 8096 } 8097 8098 set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ 8099 8100 if (enable_ept) 8101 vmx_enable_tdp(); 8102 8103 if (!enable_ept) 8104 ept_lpage_level = 0; 8105 else if (cpu_has_vmx_ept_1g_page()) 8106 ept_lpage_level = PG_LEVEL_1G; 8107 else if (cpu_has_vmx_ept_2m_page()) 8108 ept_lpage_level = PG_LEVEL_2M; 8109 else 8110 ept_lpage_level = PG_LEVEL_4K; 8111 kvm_configure_mmu(enable_ept, vmx_get_max_tdp_level(), ept_lpage_level); 8112 8113 /* 8114 * Only enable PML when hardware supports PML feature, and both EPT 8115 * and EPT A/D bit features are enabled -- PML depends on them to work. 8116 */ 8117 if (!enable_ept || !enable_ept_ad_bits || !cpu_has_vmx_pml()) 8118 enable_pml = 0; 8119 8120 if (!enable_pml) { 8121 vmx_x86_ops.slot_enable_log_dirty = NULL; 8122 vmx_x86_ops.slot_disable_log_dirty = NULL; 8123 vmx_x86_ops.flush_log_dirty = NULL; 8124 vmx_x86_ops.enable_log_dirty_pt_masked = NULL; 8125 } 8126 8127 if (!cpu_has_vmx_preemption_timer()) 8128 enable_preemption_timer = false; 8129 8130 if (enable_preemption_timer) { 8131 u64 use_timer_freq = 5000ULL * 1000 * 1000; 8132 u64 vmx_msr; 8133 8134 rdmsrl(MSR_IA32_VMX_MISC, vmx_msr); 8135 cpu_preemption_timer_multi = 8136 vmx_msr & VMX_MISC_PREEMPTION_TIMER_RATE_MASK; 8137 8138 if (tsc_khz) 8139 use_timer_freq = (u64)tsc_khz * 1000; 8140 use_timer_freq >>= cpu_preemption_timer_multi; 8141 8142 /* 8143 * KVM "disables" the preemption timer by setting it to its max 8144 * value. Don't use the timer if it might cause spurious exits 8145 * at a rate faster than 0.1 Hz (of uninterrupted guest time). 8146 */ 8147 if (use_timer_freq > 0xffffffffu / 10) 8148 enable_preemption_timer = false; 8149 } 8150 8151 if (!enable_preemption_timer) { 8152 vmx_x86_ops.set_hv_timer = NULL; 8153 vmx_x86_ops.cancel_hv_timer = NULL; 8154 vmx_x86_ops.request_immediate_exit = __kvm_request_immediate_exit; 8155 } 8156 8157 kvm_set_posted_intr_wakeup_handler(wakeup_handler); 8158 8159 kvm_mce_cap_supported |= MCG_LMCE_P; 8160 8161 if (pt_mode != PT_MODE_SYSTEM && pt_mode != PT_MODE_HOST_GUEST) 8162 return -EINVAL; 8163 if (!enable_ept || !cpu_has_vmx_intel_pt()) 8164 pt_mode = PT_MODE_SYSTEM; 8165 8166 if (nested) { 8167 nested_vmx_setup_ctls_msrs(&vmcs_config.nested, 8168 vmx_capability.ept); 8169 8170 r = nested_vmx_hardware_setup(kvm_vmx_exit_handlers); 8171 if (r) 8172 return r; 8173 } 8174 8175 vmx_set_cpu_caps(); 8176 8177 r = alloc_kvm_area(); 8178 if (r) 8179 nested_vmx_hardware_unsetup(); 8180 return r; 8181 } 8182 8183 static struct kvm_x86_init_ops vmx_init_ops __initdata = { 8184 .cpu_has_kvm_support = cpu_has_kvm_support, 8185 .disabled_by_bios = vmx_disabled_by_bios, 8186 .check_processor_compatibility = vmx_check_processor_compat, 8187 .hardware_setup = hardware_setup, 8188 8189 .runtime_ops = &vmx_x86_ops, 8190 }; 8191 8192 static void vmx_cleanup_l1d_flush(void) 8193 { 8194 if (vmx_l1d_flush_pages) { 8195 free_pages((unsigned long)vmx_l1d_flush_pages, L1D_CACHE_ORDER); 8196 vmx_l1d_flush_pages = NULL; 8197 } 8198 /* Restore state so sysfs ignores VMX */ 8199 l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_AUTO; 8200 } 8201 8202 static void vmx_exit(void) 8203 { 8204 #ifdef CONFIG_KEXEC_CORE 8205 RCU_INIT_POINTER(crash_vmclear_loaded_vmcss, NULL); 8206 synchronize_rcu(); 8207 #endif 8208 8209 kvm_exit(); 8210 8211 #if IS_ENABLED(CONFIG_HYPERV) 8212 if (static_branch_unlikely(&enable_evmcs)) { 8213 int cpu; 8214 struct hv_vp_assist_page *vp_ap; 8215 /* 8216 * Reset everything to support using non-enlightened VMCS 8217 * access later (e.g. when we reload the module with 8218 * enlightened_vmcs=0) 8219 */ 8220 for_each_online_cpu(cpu) { 8221 vp_ap = hv_get_vp_assist_page(cpu); 8222 8223 if (!vp_ap) 8224 continue; 8225 8226 vp_ap->nested_control.features.directhypercall = 0; 8227 vp_ap->current_nested_vmcs = 0; 8228 vp_ap->enlighten_vmentry = 0; 8229 } 8230 8231 static_branch_disable(&enable_evmcs); 8232 } 8233 #endif 8234 vmx_cleanup_l1d_flush(); 8235 } 8236 module_exit(vmx_exit); 8237 8238 static int __init vmx_init(void) 8239 { 8240 int r, cpu; 8241 8242 #if IS_ENABLED(CONFIG_HYPERV) 8243 /* 8244 * Enlightened VMCS usage should be recommended and the host needs 8245 * to support eVMCS v1 or above. We can also disable eVMCS support 8246 * with module parameter. 8247 */ 8248 if (enlightened_vmcs && 8249 ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && 8250 (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= 8251 KVM_EVMCS_VERSION) { 8252 int cpu; 8253 8254 /* Check that we have assist pages on all online CPUs */ 8255 for_each_online_cpu(cpu) { 8256 if (!hv_get_vp_assist_page(cpu)) { 8257 enlightened_vmcs = false; 8258 break; 8259 } 8260 } 8261 8262 if (enlightened_vmcs) { 8263 pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); 8264 static_branch_enable(&enable_evmcs); 8265 } 8266 8267 if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) 8268 vmx_x86_ops.enable_direct_tlbflush 8269 = hv_enable_direct_tlbflush; 8270 8271 } else { 8272 enlightened_vmcs = false; 8273 } 8274 #endif 8275 8276 r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx), 8277 __alignof__(struct vcpu_vmx), THIS_MODULE); 8278 if (r) 8279 return r; 8280 8281 /* 8282 * Must be called after kvm_init() so enable_ept is properly set 8283 * up. Hand the parameter mitigation value in which was stored in 8284 * the pre module init parser. If no parameter was given, it will 8285 * contain 'auto' which will be turned into the default 'cond' 8286 * mitigation mode. 8287 */ 8288 r = vmx_setup_l1d_flush(vmentry_l1d_flush_param); 8289 if (r) { 8290 vmx_exit(); 8291 return r; 8292 } 8293 8294 for_each_possible_cpu(cpu) { 8295 INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu)); 8296 INIT_LIST_HEAD(&per_cpu(blocked_vcpu_on_cpu, cpu)); 8297 spin_lock_init(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); 8298 } 8299 8300 #ifdef CONFIG_KEXEC_CORE 8301 rcu_assign_pointer(crash_vmclear_loaded_vmcss, 8302 crash_vmclear_local_loaded_vmcss); 8303 #endif 8304 vmx_check_vmcs12_offsets(); 8305 8306 /* 8307 * Intel processors don't have problems with 8308 * GUEST_MAXPHYADDR < HOST_MAXPHYADDR so enable 8309 * it for VMX by default 8310 */ 8311 allow_smaller_maxphyaddr = true; 8312 8313 return 0; 8314 } 8315 module_init(vmx_init); 8316