arch/x86/kvm/svm/svm.c

   1 #define pr_fmt(fmt) "SVM: " fmt
   2
   3 #include <linux/kvm_host.h>
   4
   5 #include "irq.h"
   6 #include "mmu.h"
   7 #include "kvm_cache_regs.h"
   8 #include "x86.h"
   9 #include "cpuid.h"
  10 #include "pmu.h"
  11
  12 #include <linux/module.h>
  13 #include <linux/mod_devicetable.h>
  14 #include <linux/kernel.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/highmem.h>
  17 #include <linux/amd-iommu.h>
  18 #include <linux/sched.h>
  19 #include <linux/trace_events.h>
  20 #include <linux/slab.h>
  21 #include <linux/hashtable.h>
  22 #include <linux/objtool.h>
  23 #include <linux/psp-sev.h>
  24 #include <linux/file.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/swap.h>
  27 #include <linux/rwsem.h>
  28
  29 #include <asm/apic.h>
  30 #include <asm/perf_event.h>
  31 #include <asm/tlbflush.h>
  32 #include <asm/desc.h>
  33 #include <asm/debugreg.h>
  34 #include <asm/kvm_para.h>
  35 #include <asm/irq_remapping.h>
  36 #include <asm/spec-ctrl.h>
  37 #include <asm/cpu_device_id.h>
  38 #include <asm/traps.h>
  39
  40 #include <asm/virtext.h>
  41 #include "trace.h"
  42
  43 #include "svm.h"
  44
  45 #define __ex(x) __kvm_handle_fault_on_reboot(x)
  46
  47 MODULE_AUTHOR("Qumranet");
  48 MODULE_LICENSE("GPL");
  49
  50 #ifdef MODULE
  51 static const struct x86_cpu_id svm_cpu_id[] = {
  52         X86_MATCH_FEATURE(X86_FEATURE_SVM, NULL),
  53         {}
  54 };
  55 MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
  56 #endif
  57
  58 #define IOPM_ALLOC_ORDER 2
  59 #define MSRPM_ALLOC_ORDER 1
  60
  61 #define SEG_TYPE_LDT 2
  62 #define SEG_TYPE_BUSY_TSS16 3
  63
  64 #define SVM_FEATURE_LBRV           (1 <<  1)
  65 #define SVM_FEATURE_SVML           (1 <<  2)
  66 #define SVM_FEATURE_TSC_RATE       (1 <<  4)
  67 #define SVM_FEATURE_VMCB_CLEAN     (1 <<  5)
  68 #define SVM_FEATURE_FLUSH_ASID     (1 <<  6)
  69 #define SVM_FEATURE_DECODE_ASSIST  (1 <<  7)
  70 #define SVM_FEATURE_PAUSE_FILTER   (1 << 10)
  71
  72 #define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
  73
  74 #define TSC_RATIO_RSVD          0xffffff0000000000ULL
  75 #define TSC_RATIO_MIN           0x0000000000000001ULL
  76 #define TSC_RATIO_MAX           0x000000ffffffffffULL
  77
  78 static bool erratum_383_found __read_mostly;
  79
  80 u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
  81
  82 /*
  83  * Set osvw_len to higher value when updated Revision Guides
  84  * are published and we know what the new status bits are
  85  */
  86 static uint64_t osvw_len = 4, osvw_status;
  87
  88 static DEFINE_PER_CPU(u64, current_tsc_ratio);
  89 #define TSC_RATIO_DEFAULT       0x0100000000ULL
  90
  91 static const struct svm_direct_access_msrs {
  92         u32 index;   /* Index of the MSR */
  93         bool always; /* True if intercept is always on */
  94 } direct_access_msrs[MAX_DIRECT_ACCESS_MSRS] = {
  95         { .index = MSR_STAR,                            .always = true  },
  96         { .index = MSR_IA32_SYSENTER_CS,                .always = true  },
  97 #ifdef CONFIG_X86_64
  98         { .index = MSR_GS_BASE,                         .always = true  },
  99         { .index = MSR_FS_BASE,                         .always = true  },
 100         { .index = MSR_KERNEL_GS_BASE,                  .always = true  },
 101         { .index = MSR_LSTAR,                           .always = true  },
 102         { .index = MSR_CSTAR,                           .always = true  },
 103         { .index = MSR_SYSCALL_MASK,                    .always = true  },
 104 #endif
 105         { .index = MSR_IA32_SPEC_CTRL,                  .always = false },
 106         { .index = MSR_IA32_PRED_CMD,                   .always = false },
 107         { .index = MSR_IA32_LASTBRANCHFROMIP,           .always = false },
 108         { .index = MSR_IA32_LASTBRANCHTOIP,             .always = false },
 109         { .index = MSR_IA32_LASTINTFROMIP,              .always = false },
 110         { .index = MSR_IA32_LASTINTTOIP,                .always = false },
 111         { .index = MSR_INVALID,                         .always = false },
 112 };
 113
 114 /* enable NPT for AMD64 and X86 with PAE */
 115 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 116 bool npt_enabled = true;
 117 #else
 118 bool npt_enabled;
 119 #endif
 120
 121 /*
 122  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
 123  * pause_filter_count: On processors that support Pause filtering(indicated
 124  *      by CPUID Fn8000_000A_EDX), the VMCB provides a 16 bit pause filter
 125  *      count value. On VMRUN this value is loaded into an internal counter.
 126  *      Each time a pause instruction is executed, this counter is decremented
 127  *      until it reaches zero at which time a #VMEXIT is generated if pause
 128  *      intercept is enabled. Refer to  AMD APM Vol 2 Section 15.14.4 Pause
 129  *      Intercept Filtering for more details.
 130  *      This also indicate if ple logic enabled.
 131  *
 132  * pause_filter_thresh: In addition, some processor families support advanced
 133  *      pause filtering (indicated by CPUID Fn8000_000A_EDX) upper bound on
 134  *      the amount of time a guest is allowed to execute in a pause loop.
 135  *      In this mode, a 16-bit pause filter threshold field is added in the
 136  *      VMCB. The threshold value is a cycle count that is used to reset the
 137  *      pause counter. As with simple pause filtering, VMRUN loads the pause
 138  *      count value from VMCB into an internal counter. Then, on each pause
 139  *      instruction the hardware checks the elapsed number of cycles since
 140  *      the most recent pause instruction against the pause filter threshold.
 141  *      If the elapsed cycle count is greater than the pause filter threshold,
 142  *      then the internal pause count is reloaded from the VMCB and execution
 143  *      continues. If the elapsed cycle count is less than the pause filter
 144  *      threshold, then the internal pause count is decremented. If the count
 145  *      value is less than zero and PAUSE intercept is enabled, a #VMEXIT is
 146  *      triggered. If advanced pause filtering is supported and pause filter
 147  *      threshold field is set to zero, the filter will operate in the simpler,
 148  *      count only mode.
 149  */
 150
 151 static unsigned short pause_filter_thresh = KVM_DEFAULT_PLE_GAP;
 152 module_param(pause_filter_thresh, ushort, 0444);
 153
 154 static unsigned short pause_filter_count = KVM_SVM_DEFAULT_PLE_WINDOW;
 155 module_param(pause_filter_count, ushort, 0444);
 156
 157 /* Default doubles per-vcpu window every exit. */
 158 static unsigned short pause_filter_count_grow = KVM_DEFAULT_PLE_WINDOW_GROW;
 159 module_param(pause_filter_count_grow, ushort, 0444);
 160
 161 /* Default resets per-vcpu window every exit to pause_filter_count. */
 162 static unsigned short pause_filter_count_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK;
 163 module_param(pause_filter_count_shrink, ushort, 0444);
 164
 165 /* Default is to compute the maximum so we can never overflow. */
 166 static unsigned short pause_filter_count_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX;
 167 module_param(pause_filter_count_max, ushort, 0444);
 168
 169 /* allow nested paging (virtualized MMU) for all guests */
 170 static int npt = true;
 171 module_param(npt, int, S_IRUGO);
 172
 173 /* allow nested virtualization in KVM/SVM */
 174 static int nested = true;
 175 module_param(nested, int, S_IRUGO);
 176
 177 /* enable/disable Next RIP Save */
 178 static int nrips = true;
 179 module_param(nrips, int, 0444);
 180
 181 /* enable/disable Virtual VMLOAD VMSAVE */
 182 static int vls = true;
 183 module_param(vls, int, 0444);
 184
 185 /* enable/disable Virtual GIF */
 186 static int vgif = true;
 187 module_param(vgif, int, 0444);
 188
 189 /* enable/disable SEV support */
 190 int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
 191 module_param(sev, int, 0444);
 192
 193 /* enable/disable SEV-ES support */
 194 int sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
 195 module_param(sev_es, int, 0444);
 196
 197 bool __read_mostly dump_invalid_vmcb;
 198 module_param(dump_invalid_vmcb, bool, 0644);
 199
 200 static u8 rsm_ins_bytes[] = "\x0f\xaa";
 201
 202 static void svm_complete_interrupts(struct vcpu_svm *svm);
 203
 204 static unsigned long iopm_base;
 205
 206 struct kvm_ldttss_desc {
 207         u16 limit0;
 208         u16 base0;
 209         unsigned base1:8, type:5, dpl:2, p:1;
 210         unsigned limit1:4, zero0:3, g:1, base2:8;
 211         u32 base3;
 212         u32 zero1;
 213 } __attribute__((packed));
 214
 215 DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
 216
 217 static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
 218
 219 #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
 220 #define MSRS_RANGE_SIZE 2048
 221 #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
 222
 223 u32 svm_msrpm_offset(u32 msr)
 224 {
 225         u32 offset;
 226         int i;
 227
 228         for (i = 0; i < NUM_MSR_MAPS; i++) {
 229                 if (msr < msrpm_ranges[i] ||
 230                     msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
 231                         continue;
 232
 233                 offset  = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
 234                 offset += (i * MSRS_RANGE_SIZE);       /* add range offset */
 235
 236                 /* Now we have the u8 offset - but need the u32 offset */
 237                 return offset / 4;
 238         }
 239
 240         /* MSR not in any range */
 241         return MSR_INVALID;
 242 }
 243
 244 #define MAX_INST_SIZE 15
 245
 246 static inline void clgi(void)
 247 {
 248         asm volatile (__ex("clgi"));
 249 }
 250
 251 static inline void stgi(void)
 252 {
 253         asm volatile (__ex("stgi"));
 254 }
 255
 256 static inline void invlpga(unsigned long addr, u32 asid)
 257 {
 258         asm volatile (__ex("invlpga %1, %0") : : "c"(asid), "a"(addr));
 259 }
 260
 261 static int get_max_npt_level(void)
 262 {
 263 #ifdef CONFIG_X86_64
 264         return PT64_ROOT_4LEVEL;
 265 #else
 266         return PT32E_ROOT_LEVEL;
 267 #endif
 268 }
 269
 270 int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
 271 {
 272         struct vcpu_svm *svm = to_svm(vcpu);
 273         u64 old_efer = vcpu->arch.efer;
 274         vcpu->arch.efer = efer;
 275
 276         if (!npt_enabled) {
 277                 /* Shadow paging assumes NX to be available.  */
 278                 efer |= EFER_NX;
 279
 280                 if (!(efer & EFER_LMA))
 281                         efer &= ~EFER_LME;
 282         }
 283
 284         if ((old_efer & EFER_SVME) != (efer & EFER_SVME)) {
 285                 if (!(efer & EFER_SVME)) {
 286                         svm_leave_nested(svm);
 287                         svm_set_gif(svm, true);
 288
 289                         /*
 290                          * Free the nested guest state, unless we are in SMM.
 291                          * In this case we will return to the nested guest
 292                          * as soon as we leave SMM.
 293                          */
 294                         if (!is_smm(&svm->vcpu))
 295                                 svm_free_nested(svm);
 296
 297                 } else {
 298                         int ret = svm_allocate_nested(svm);
 299
 300                         if (ret) {
 301                                 vcpu->arch.efer = old_efer;
 302                                 return ret;
 303                         }
 304                 }
 305         }
 306
 307         svm->vmcb->save.efer = efer | EFER_SVME;
 308         vmcb_mark_dirty(svm->vmcb, VMCB_CR);
 309         return 0;
 310 }
 311
 312 static int is_external_interrupt(u32 info)
 313 {
 314         info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
 315         return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
 316 }
 317
 318 static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
 319 {
 320         struct vcpu_svm *svm = to_svm(vcpu);
 321         u32 ret = 0;
 322
 323         if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
 324                 ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
 325         return ret;
 326 }
 327
 328 static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
 329 {
 330         struct vcpu_svm *svm = to_svm(vcpu);
 331
 332         if (mask == 0)
 333                 svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
 334         else
 335                 svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
 336
 337 }
 338
 339 static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
 340 {
 341         struct vcpu_svm *svm = to_svm(vcpu);
 342
 343         /*
 344          * SEV-ES does not expose the next RIP. The RIP update is controlled by
 345          * the type of exit and the #VC handler in the guest.
 346          */
 347         if (sev_es_guest(vcpu->kvm))
 348                 goto done;
 349
 350         if (nrips && svm->vmcb->control.next_rip != 0) {
 351                 WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
 352                 svm->next_rip = svm->vmcb->control.next_rip;
 353         }
 354
 355         if (!svm->next_rip) {
 356                 if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP))
 357                         return 0;
 358         } else {
 359                 kvm_rip_write(vcpu, svm->next_rip);
 360         }
 361
 362 done:
 363         svm_set_interrupt_shadow(vcpu, 0);
 364
 365         return 1;
 366 }
 367
 368 static void svm_queue_exception(struct kvm_vcpu *vcpu)
 369 {
 370         struct vcpu_svm *svm = to_svm(vcpu);
 371         unsigned nr = vcpu->arch.exception.nr;
 372         bool has_error_code = vcpu->arch.exception.has_error_code;
 373         u32 error_code = vcpu->arch.exception.error_code;
 374
 375         kvm_deliver_exception_payload(&svm->vcpu);
 376
 377         if (nr == BP_VECTOR && !nrips) {
 378                 unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);
 379
 380                 /*
 381                  * For guest debugging where we have to reinject #BP if some
 382                  * INT3 is guest-owned:
 383                  * Emulate nRIP by moving RIP forward. Will fail if injection
 384                  * raises a fault that is not intercepted. Still better than
 385                  * failing in all cases.
 386                  */
 387                 (void)skip_emulated_instruction(&svm->vcpu);
 388                 rip = kvm_rip_read(&svm->vcpu);
 389                 svm->int3_rip = rip + svm->vmcb->save.cs.base;
 390                 svm->int3_injected = rip - old_rip;
 391         }
 392
 393         svm->vmcb->control.event_inj = nr
 394                 | SVM_EVTINJ_VALID
 395                 | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
 396                 | SVM_EVTINJ_TYPE_EXEPT;
 397         svm->vmcb->control.event_inj_err = error_code;
 398 }
 399
 400 static void svm_init_erratum_383(void)
 401 {
 402         u32 low, high;
 403         int err;
 404         u64 val;
 405
 406         if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
 407                 return;
 408
 409         /* Use _safe variants to not break nested virtualization */
 410         val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
 411         if (err)
 412                 return;
 413
 414         val |= (1ULL << 47);
 415
 416         low  = lower_32_bits(val);
 417         high = upper_32_bits(val);
 418
 419         native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);
 420
 421         erratum_383_found = true;
 422 }
 423
 424 static void svm_init_osvw(struct kvm_vcpu *vcpu)
 425 {
 426         /*
 427          * Guests should see errata 400 and 415 as fixed (assuming that
 428          * HLT and IO instructions are intercepted).
 429          */
 430         vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
 431         vcpu->arch.osvw.status = osvw_status & ~(6ULL);
 432
 433         /*
 434          * By increasing VCPU's osvw.length to 3 we are telling the guest that
 435          * all osvw.status bits inside that length, including bit 0 (which is
 436          * reserved for erratum 298), are valid. However, if host processor's
 437          * osvw_len is 0 then osvw_status[0] carries no information. We need to
 438          * be conservative here and therefore we tell the guest that erratum 298
 439          * is present (because we really don't know).
 440          */
 441         if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
 442                 vcpu->arch.osvw.status |= 1;
 443 }
 444
 445 static int has_svm(void)
 446 {
 447         const char *msg;
 448
 449         if (!cpu_has_svm(&msg)) {
 450                 printk(KERN_INFO "has_svm: %s\n", msg);
 451                 return 0;
 452         }
 453
 454         return 1;
 455 }
 456
 457 static void svm_hardware_disable(void)
 458 {
 459         /* Make sure we clean up behind us */
 460         if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
 461                 wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
 462
 463         cpu_svm_disable();
 464
 465         amd_pmu_disable_virt();
 466 }
 467
 468 static int svm_hardware_enable(void)
 469 {
 470
 471         struct svm_cpu_data *sd;
 472         uint64_t efer;
 473         struct desc_struct *gdt;
 474         int me = raw_smp_processor_id();
 475
 476         rdmsrl(MSR_EFER, efer);
 477         if (efer & EFER_SVME)
 478                 return -EBUSY;
 479
 480         if (!has_svm()) {
 481                 pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
 482                 return -EINVAL;
 483         }
 484         sd = per_cpu(svm_data, me);
 485         if (!sd) {
 486                 pr_err("%s: svm_data is NULL on %d\n", __func__, me);
 487                 return -EINVAL;
 488         }
 489
 490         sd->asid_generation = 1;
 491         sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
 492         sd->next_asid = sd->max_asid + 1;
 493         sd->min_asid = max_sev_asid + 1;
 494
 495         gdt = get_current_gdt_rw();
 496         sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
 497
 498         wrmsrl(MSR_EFER, efer | EFER_SVME);
 499
 500         wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
 501
 502         if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
 503                 wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
 504                 __this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
 505         }
 506
 507
 508         /*
 509          * Get OSVW bits.
 510          *
 511          * Note that it is possible to have a system with mixed processor
 512          * revisions and therefore different OSVW bits. If bits are not the same
 513          * on different processors then choose the worst case (i.e. if erratum
 514          * is present on one processor and not on another then assume that the
 515          * erratum is present everywhere).
 516          */
 517         if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) {
 518                 uint64_t len, status = 0;
 519                 int err;
 520
 521                 len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err);
 522                 if (!err)
 523                         status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS,
 524                                                       &err);
 525
 526                 if (err)
 527                         osvw_status = osvw_len = 0;
 528                 else {
 529                         if (len < osvw_len)
 530                                 osvw_len = len;
 531                         osvw_status |= status;
 532                         osvw_status &= (1ULL << osvw_len) - 1;
 533                 }
 534         } else
 535                 osvw_status = osvw_len = 0;
 536
 537         svm_init_erratum_383();
 538
 539         amd_pmu_enable_virt();
 540
 541         return 0;
 542 }
 543
 544 static void svm_cpu_uninit(int cpu)
 545 {
 546         struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
 547
 548         if (!sd)
 549                 return;
 550
 551         per_cpu(svm_data, raw_smp_processor_id()) = NULL;
 552         kfree(sd->sev_vmcbs);
 553         __free_page(sd->save_area);
 554         kfree(sd);
 555 }
 556
 557 static int svm_cpu_init(int cpu)
 558 {
 559         struct svm_cpu_data *sd;
 560
 561         sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
 562         if (!sd)
 563                 return -ENOMEM;
 564         sd->cpu = cpu;
 565         sd->save_area = alloc_page(GFP_KERNEL);
 566         if (!sd->save_area)
 567                 goto free_cpu_data;
 568
 569         if (svm_sev_enabled()) {
 570                 sd->sev_vmcbs = kmalloc_array(max_sev_asid + 1,
 571                                               sizeof(void *),
 572                                               GFP_KERNEL);
 573                 if (!sd->sev_vmcbs)
 574                         goto free_save_area;
 575         }
 576
 577         per_cpu(svm_data, cpu) = sd;
 578
 579         return 0;
 580
 581 free_save_area:
 582         __free_page(sd->save_area);
 583 free_cpu_data:
 584         kfree(sd);
 585         return -ENOMEM;
 586
 587 }
 588
 589 static int direct_access_msr_slot(u32 msr)
 590 {
 591         u32 i;
 592
 593         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
 594                 if (direct_access_msrs[i].index == msr)
 595                         return i;
 596
 597         return -ENOENT;
 598 }
 599
 600 static void set_shadow_msr_intercept(struct kvm_vcpu *vcpu, u32 msr, int read,
 601                                      int write)
 602 {
 603         struct vcpu_svm *svm = to_svm(vcpu);
 604         int slot = direct_access_msr_slot(msr);
 605
 606         if (slot == -ENOENT)
 607                 return;
 608
 609         /* Set the shadow bitmaps to the desired intercept states */
 610         if (read)
 611                 set_bit(slot, svm->shadow_msr_intercept.read);
 612         else
 613                 clear_bit(slot, svm->shadow_msr_intercept.read);
 614
 615         if (write)
 616                 set_bit(slot, svm->shadow_msr_intercept.write);
 617         else
 618                 clear_bit(slot, svm->shadow_msr_intercept.write);
 619 }
 620
 621 static bool valid_msr_intercept(u32 index)
 622 {
 623         return direct_access_msr_slot(index) != -ENOENT;
 624 }
 625
 626 static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr)
 627 {
 628         u8 bit_write;
 629         unsigned long tmp;
 630         u32 offset;
 631         u32 *msrpm;
 632
 633         msrpm = is_guest_mode(vcpu) ? to_svm(vcpu)->nested.msrpm:
 634                                       to_svm(vcpu)->msrpm;
 635
 636         offset    = svm_msrpm_offset(msr);
 637         bit_write = 2 * (msr & 0x0f) + 1;
 638         tmp       = msrpm[offset];
 639
 640         BUG_ON(offset == MSR_INVALID);
 641
 642         return !!test_bit(bit_write,  &tmp);
 643 }
 644
 645 static void set_msr_interception_bitmap(struct kvm_vcpu *vcpu, u32 *msrpm,
 646                                         u32 msr, int read, int write)
 647 {
 648         u8 bit_read, bit_write;
 649         unsigned long tmp;
 650         u32 offset;
 651
 652         /*
 653          * If this warning triggers extend the direct_access_msrs list at the
 654          * beginning of the file
 655          */
 656         WARN_ON(!valid_msr_intercept(msr));
 657
 658         /* Enforce non allowed MSRs to trap */
 659         if (read && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_READ))
 660                 read = 0;
 661
 662         if (write && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_WRITE))
 663                 write = 0;
 664
 665         offset    = svm_msrpm_offset(msr);
 666         bit_read  = 2 * (msr & 0x0f);
 667         bit_write = 2 * (msr & 0x0f) + 1;
 668         tmp       = msrpm[offset];
 669
 670         BUG_ON(offset == MSR_INVALID);
 671
 672         read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);
 673         write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
 674
 675         msrpm[offset] = tmp;
 676 }
 677
 678 static void set_msr_interception(struct kvm_vcpu *vcpu, u32 *msrpm, u32 msr,
 679                                  int read, int write)
 680 {
 681         set_shadow_msr_intercept(vcpu, msr, read, write);
 682         set_msr_interception_bitmap(vcpu, msrpm, msr, read, write);
 683 }
 684
 685 u32 *svm_vcpu_alloc_msrpm(void)
 686 {
 687         struct page *pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
 688         u32 *msrpm;
 689
 690         if (!pages)
 691                 return NULL;
 692
 693         msrpm = page_address(pages);
 694         memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
 695
 696         return msrpm;
 697 }
 698
 699 void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm)
 700 {
 701         int i;
 702
 703         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
 704                 if (!direct_access_msrs[i].always)
 705                         continue;
 706                 set_msr_interception(vcpu, msrpm, direct_access_msrs[i].index, 1, 1);
 707         }
 708 }
 709
 710
 711 void svm_vcpu_free_msrpm(u32 *msrpm)
 712 {
 713         __free_pages(virt_to_page(msrpm), MSRPM_ALLOC_ORDER);
 714 }
 715
 716 static void svm_msr_filter_changed(struct kvm_vcpu *vcpu)
 717 {
 718         struct vcpu_svm *svm = to_svm(vcpu);
 719         u32 i;
 720
 721         /*
 722          * Set intercept permissions for all direct access MSRs again. They
 723          * will automatically get filtered through the MSR filter, so we are
 724          * back in sync after this.
 725          */
 726         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
 727                 u32 msr = direct_access_msrs[i].index;
 728                 u32 read = test_bit(i, svm->shadow_msr_intercept.read);
 729                 u32 write = test_bit(i, svm->shadow_msr_intercept.write);
 730
 731                 set_msr_interception_bitmap(vcpu, svm->msrpm, msr, read, write);
 732         }
 733 }
 734
 735 static void add_msr_offset(u32 offset)
 736 {
 737         int i;
 738
 739         for (i = 0; i < MSRPM_OFFSETS; ++i) {
 740
 741                 /* Offset already in list? */
 742                 if (msrpm_offsets[i] == offset)
 743                         return;
 744
 745                 /* Slot used by another offset? */
 746                 if (msrpm_offsets[i] != MSR_INVALID)
 747                         continue;
 748
 749                 /* Add offset to list */
 750                 msrpm_offsets[i] = offset;
 751
 752                 return;
 753         }
 754
 755         /*
 756          * If this BUG triggers the msrpm_offsets table has an overflow. Just
 757          * increase MSRPM_OFFSETS in this case.
 758          */
 759         BUG();
 760 }
 761
 762 static void init_msrpm_offsets(void)
 763 {
 764         int i;
 765
 766         memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));
 767
 768         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
 769                 u32 offset;
 770
 771                 offset = svm_msrpm_offset(direct_access_msrs[i].index);
 772                 BUG_ON(offset == MSR_INVALID);
 773
 774                 add_msr_offset(offset);
 775         }
 776 }
 777
 778 static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
 779 {
 780         struct vcpu_svm *svm = to_svm(vcpu);
 781
 782         svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
 783         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
 784         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
 785         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
 786         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
 787 }
 788
 789 static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
 790 {
 791         struct vcpu_svm *svm = to_svm(vcpu);
 792
 793         svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
 794         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
 795         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
 796         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
 797         set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
 798 }
 799
 800 void disable_nmi_singlestep(struct vcpu_svm *svm)
 801 {
 802         svm->nmi_singlestep = false;
 803
 804         if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) {
 805                 /* Clear our flags if they were not set by the guest */
 806                 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
 807                         svm->vmcb->save.rflags &= ~X86_EFLAGS_TF;
 808                 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
 809                         svm->vmcb->save.rflags &= ~X86_EFLAGS_RF;
 810         }
 811 }
 812
 813 static void grow_ple_window(struct kvm_vcpu *vcpu)
 814 {
 815         struct vcpu_svm *svm = to_svm(vcpu);
 816         struct vmcb_control_area *control = &svm->vmcb->control;
 817         int old = control->pause_filter_count;
 818
 819         control->pause_filter_count = __grow_ple_window(old,
 820                                                         pause_filter_count,
 821                                                         pause_filter_count_grow,
 822                                                         pause_filter_count_max);
 823
 824         if (control->pause_filter_count != old) {
 825                 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 826                 trace_kvm_ple_window_update(vcpu->vcpu_id,
 827                                             control->pause_filter_count, old);
 828         }
 829 }
 830
 831 static void shrink_ple_window(struct kvm_vcpu *vcpu)
 832 {
 833         struct vcpu_svm *svm = to_svm(vcpu);
 834         struct vmcb_control_area *control = &svm->vmcb->control;
 835         int old = control->pause_filter_count;
 836
 837         control->pause_filter_count =
 838                                 __shrink_ple_window(old,
 839                                                     pause_filter_count,
 840                                                     pause_filter_count_shrink,
 841                                                     pause_filter_count);
 842         if (control->pause_filter_count != old) {
 843                 vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 844                 trace_kvm_ple_window_update(vcpu->vcpu_id,
 845                                             control->pause_filter_count, old);
 846         }
 847 }
 848
 849 /*
 850  * The default MMIO mask is a single bit (excluding the present bit),
 851  * which could conflict with the memory encryption bit. Check for
 852  * memory encryption support and override the default MMIO mask if
 853  * memory encryption is enabled.
 854  */
 855 static __init void svm_adjust_mmio_mask(void)
 856 {
 857         unsigned int enc_bit, mask_bit;
 858         u64 msr, mask;
 859
 860         /* If there is no memory encryption support, use existing mask */
 861         if (cpuid_eax(0x80000000) < 0x8000001f)
 862                 return;
 863
 864         /* If memory encryption is not enabled, use existing mask */
 865         rdmsrl(MSR_K8_SYSCFG, msr);
 866         if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
 867                 return;
 868
 869         enc_bit = cpuid_ebx(0x8000001f) & 0x3f;
 870         mask_bit = boot_cpu_data.x86_phys_bits;
 871
 872         /* Increment the mask bit if it is the same as the encryption bit */
 873         if (enc_bit == mask_bit)
 874                 mask_bit++;
 875
 876         /*
 877          * If the mask bit location is below 52, then some bits above the
 878          * physical addressing limit will always be reserved, so use the
 879          * rsvd_bits() function to generate the mask. This mask, along with
 880          * the present bit, will be used to generate a page fault with
 881          * PFER.RSV = 1.
 882          *
 883          * If the mask bit location is 52 (or above), then clear the mask.
 884          */
 885         mask = (mask_bit < 52) ? rsvd_bits(mask_bit, 51) | PT_PRESENT_MASK : 0;
 886
 887         kvm_mmu_set_mmio_spte_mask(mask, PT_WRITABLE_MASK | PT_USER_MASK);
 888 }
 889
 890 static void svm_hardware_teardown(void)
 891 {
 892         int cpu;
 893
 894         if (svm_sev_enabled())
 895                 sev_hardware_teardown();
 896
 897         for_each_possible_cpu(cpu)
 898                 svm_cpu_uninit(cpu);
 899
 900         __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
 901         iopm_base = 0;
 902 }
 903
 904 static __init void svm_set_cpu_caps(void)
 905 {
 906         kvm_set_cpu_caps();
 907
 908         supported_xss = 0;
 909
 910         /* CPUID 0x80000001 and 0x8000000A (SVM features) */
 911         if (nested) {
 912                 kvm_cpu_cap_set(X86_FEATURE_SVM);
 913
 914                 if (nrips)
 915                         kvm_cpu_cap_set(X86_FEATURE_NRIPS);
 916
 917                 if (npt_enabled)
 918                         kvm_cpu_cap_set(X86_FEATURE_NPT);
 919         }
 920
 921         /* CPUID 0x80000008 */
 922         if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
 923             boot_cpu_has(X86_FEATURE_AMD_SSBD))
 924                 kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
 925
 926         /* Enable INVPCID feature */
 927         kvm_cpu_cap_check_and_set(X86_FEATURE_INVPCID);
 928 }
 929
 930 static __init int svm_hardware_setup(void)
 931 {
 932         int cpu;
 933         struct page *iopm_pages;
 934         void *iopm_va;
 935         int r;
 936
 937         iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
 938
 939         if (!iopm_pages)
 940                 return -ENOMEM;
 941
 942         iopm_va = page_address(iopm_pages);
 943         memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
 944         iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
 945
 946         init_msrpm_offsets();
 947
 948         supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
 949
 950         if (boot_cpu_has(X86_FEATURE_NX))
 951                 kvm_enable_efer_bits(EFER_NX);
 952
 953         if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
 954                 kvm_enable_efer_bits(EFER_FFXSR);
 955
 956         if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
 957                 kvm_has_tsc_control = true;
 958                 kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
 959                 kvm_tsc_scaling_ratio_frac_bits = 32;
 960         }
 961
 962         /* Check for pause filtering support */
 963         if (!boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
 964                 pause_filter_count = 0;
 965                 pause_filter_thresh = 0;
 966         } else if (!boot_cpu_has(X86_FEATURE_PFTHRESHOLD)) {
 967                 pause_filter_thresh = 0;
 968         }
 969
 970         if (nested) {
 971                 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
 972                 kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
 973         }
 974
 975         if (IS_ENABLED(CONFIG_KVM_AMD_SEV) && sev) {
 976                 sev_hardware_setup();
 977         } else {
 978                 sev = false;
 979                 sev_es = false;
 980         }
 981
 982         svm_adjust_mmio_mask();
 983
 984         for_each_possible_cpu(cpu) {
 985                 r = svm_cpu_init(cpu);
 986                 if (r)
 987                         goto err;
 988         }
 989
 990         if (!boot_cpu_has(X86_FEATURE_NPT))
 991                 npt_enabled = false;
 992
 993         if (npt_enabled && !npt)
 994                 npt_enabled = false;
 995
 996         kvm_configure_mmu(npt_enabled, get_max_npt_level(), PG_LEVEL_1G);
 997         pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
 998
 999         if (nrips) {
1000                 if (!boot_cpu_has(X86_FEATURE_NRIPS))
1001                         nrips = false;
1002         }
1003
1004         if (avic) {
1005                 if (!npt_enabled ||
1006                     !boot_cpu_has(X86_FEATURE_AVIC) ||
1007                     !IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
1008                         avic = false;
1009                 } else {
1010                         pr_info("AVIC enabled\n");
1011
1012                         amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
1013                 }
1014         }
1015
1016         if (vls) {
1017                 if (!npt_enabled ||
1018                     !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
1019                     !IS_ENABLED(CONFIG_X86_64)) {
1020                         vls = false;
1021                 } else {
1022                         pr_info("Virtual VMLOAD VMSAVE supported\n");
1023                 }
1024         }
1025
1026         if (vgif) {
1027                 if (!boot_cpu_has(X86_FEATURE_VGIF))
1028                         vgif = false;
1029                 else
1030                         pr_info("Virtual GIF supported\n");
1031         }
1032
1033         svm_set_cpu_caps();
1034
1035         /*
1036          * It seems that on AMD processors PTE's accessed bit is
1037          * being set by the CPU hardware before the NPF vmexit.
1038          * This is not expected behaviour and our tests fail because
1039          * of it.
1040          * A workaround here is to disable support for
1041          * GUEST_MAXPHYADDR < HOST_MAXPHYADDR if NPT is enabled.
1042          * In this case userspace can know if there is support using
1043          * KVM_CAP_SMALLER_MAXPHYADDR extension and decide how to handle
1044          * it
1045          * If future AMD CPU models change the behaviour described above,
1046          * this variable can be changed accordingly
1047          */
1048         allow_smaller_maxphyaddr = !npt_enabled;
1049
1050         return 0;
1051
1052 err:
1053         svm_hardware_teardown();
1054         return r;
1055 }
1056
1057 static void init_seg(struct vmcb_seg *seg)
1058 {
1059         seg->selector = 0;
1060         seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
1061                       SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
1062         seg->limit = 0xffff;
1063         seg->base = 0;
1064 }
1065
1066 static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
1067 {
1068         seg->selector = 0;
1069         seg->attrib = SVM_SELECTOR_P_MASK | type;
1070         seg->limit = 0xffff;
1071         seg->base = 0;
1072 }
1073
1074 static u64 svm_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1075 {
1076         struct vcpu_svm *svm = to_svm(vcpu);
1077         u64 g_tsc_offset = 0;
1078
1079         if (is_guest_mode(vcpu)) {
1080                 /* Write L1's TSC offset.  */
1081                 g_tsc_offset = svm->vmcb->control.tsc_offset -
1082                                svm->nested.hsave->control.tsc_offset;
1083                 svm->nested.hsave->control.tsc_offset = offset;
1084         }
1085
1086         trace_kvm_write_tsc_offset(vcpu->vcpu_id,
1087                                    svm->vmcb->control.tsc_offset - g_tsc_offset,
1088                                    offset);
1089
1090         svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
1091
1092         vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
1093         return svm->vmcb->control.tsc_offset;
1094 }
1095
1096 static void svm_check_invpcid(struct vcpu_svm *svm)
1097 {
1098         /*
1099          * Intercept INVPCID instruction only if shadow page table is
1100          * enabled. Interception is not required with nested page table
1101          * enabled.
1102          */
1103         if (kvm_cpu_cap_has(X86_FEATURE_INVPCID)) {
1104                 if (!npt_enabled)
1105                         svm_set_intercept(svm, INTERCEPT_INVPCID);
1106                 else
1107                         svm_clr_intercept(svm, INTERCEPT_INVPCID);
1108         }
1109 }
1110
1111 static void init_vmcb(struct vcpu_svm *svm)
1112 {
1113         struct vmcb_control_area *control = &svm->vmcb->control;
1114         struct vmcb_save_area *save = &svm->vmcb->save;
1115
1116         svm->vcpu.arch.hflags = 0;
1117
1118         svm_set_intercept(svm, INTERCEPT_CR0_READ);
1119         svm_set_intercept(svm, INTERCEPT_CR3_READ);
1120         svm_set_intercept(svm, INTERCEPT_CR4_READ);
1121         svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
1122         svm_set_intercept(svm, INTERCEPT_CR3_WRITE);
1123         svm_set_intercept(svm, INTERCEPT_CR4_WRITE);
1124         if (!kvm_vcpu_apicv_active(&svm->vcpu))
1125                 svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
1126
1127         set_dr_intercepts(svm);
1128
1129         set_exception_intercept(svm, PF_VECTOR);
1130         set_exception_intercept(svm, UD_VECTOR);
1131         set_exception_intercept(svm, MC_VECTOR);
1132         set_exception_intercept(svm, AC_VECTOR);
1133         set_exception_intercept(svm, DB_VECTOR);
1134         /*
1135          * Guest access to VMware backdoor ports could legitimately
1136          * trigger #GP because of TSS I/O permission bitmap.
1137          * We intercept those #GP and allow access to them anyway
1138          * as VMware does.
1139          */
1140         if (enable_vmware_backdoor)
1141                 set_exception_intercept(svm, GP_VECTOR);
1142
1143         svm_set_intercept(svm, INTERCEPT_INTR);
1144         svm_set_intercept(svm, INTERCEPT_NMI);
1145         svm_set_intercept(svm, INTERCEPT_SMI);
1146         svm_set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
1147         svm_set_intercept(svm, INTERCEPT_RDPMC);
1148         svm_set_intercept(svm, INTERCEPT_CPUID);
1149         svm_set_intercept(svm, INTERCEPT_INVD);
1150         svm_set_intercept(svm, INTERCEPT_INVLPG);
1151         svm_set_intercept(svm, INTERCEPT_INVLPGA);
1152         svm_set_intercept(svm, INTERCEPT_IOIO_PROT);
1153         svm_set_intercept(svm, INTERCEPT_MSR_PROT);
1154         svm_set_intercept(svm, INTERCEPT_TASK_SWITCH);
1155         svm_set_intercept(svm, INTERCEPT_SHUTDOWN);
1156         svm_set_intercept(svm, INTERCEPT_VMRUN);
1157         svm_set_intercept(svm, INTERCEPT_VMMCALL);
1158         svm_set_intercept(svm, INTERCEPT_VMLOAD);
1159         svm_set_intercept(svm, INTERCEPT_VMSAVE);
1160         svm_set_intercept(svm, INTERCEPT_STGI);
1161         svm_set_intercept(svm, INTERCEPT_CLGI);
1162         svm_set_intercept(svm, INTERCEPT_SKINIT);
1163         svm_set_intercept(svm, INTERCEPT_WBINVD);
1164         svm_set_intercept(svm, INTERCEPT_XSETBV);
1165         svm_set_intercept(svm, INTERCEPT_RDPRU);
1166         svm_set_intercept(svm, INTERCEPT_RSM);
1167
1168         if (!kvm_mwait_in_guest(svm->vcpu.kvm)) {
1169                 svm_set_intercept(svm, INTERCEPT_MONITOR);
1170                 svm_set_intercept(svm, INTERCEPT_MWAIT);
1171         }
1172
1173         if (!kvm_hlt_in_guest(svm->vcpu.kvm))
1174                 svm_set_intercept(svm, INTERCEPT_HLT);
1175
1176         control->iopm_base_pa = __sme_set(iopm_base);
1177         control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
1178         control->int_ctl = V_INTR_MASKING_MASK;
1179
1180         init_seg(&save->es);
1181         init_seg(&save->ss);
1182         init_seg(&save->ds);
1183         init_seg(&save->fs);
1184         init_seg(&save->gs);
1185
1186         save->cs.selector = 0xf000;
1187         save->cs.base = 0xffff0000;
1188         /* Executable/Readable Code Segment */
1189         save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
1190                 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
1191         save->cs.limit = 0xffff;
1192
1193         save->gdtr.limit = 0xffff;
1194         save->idtr.limit = 0xffff;
1195
1196         init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
1197         init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
1198
1199         svm_set_efer(&svm->vcpu, 0);
1200         save->dr6 = 0xffff0ff0;
1201         kvm_set_rflags(&svm->vcpu, 2);
1202         save->rip = 0x0000fff0;
1203         svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
1204
1205         /*
1206          * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
1207          * It also updates the guest-visible cr0 value.
1208          */
1209         svm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
1210         kvm_mmu_reset_context(&svm->vcpu);
1211
1212         save->cr4 = X86_CR4_PAE;
1213         /* rdx = ?? */
1214
1215         if (npt_enabled) {
1216                 /* Setup VMCB for Nested Paging */
1217                 control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
1218                 svm_clr_intercept(svm, INTERCEPT_INVLPG);
1219                 clr_exception_intercept(svm, PF_VECTOR);
1220                 svm_clr_intercept(svm, INTERCEPT_CR3_READ);
1221                 svm_clr_intercept(svm, INTERCEPT_CR3_WRITE);
1222                 save->g_pat = svm->vcpu.arch.pat;
1223                 save->cr3 = 0;
1224                 save->cr4 = 0;
1225         }
1226         svm->asid_generation = 0;
1227         svm->asid = 0;
1228
1229         svm->nested.vmcb12_gpa = 0;
1230         svm->vcpu.arch.hflags = 0;
1231
1232         if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
1233                 control->pause_filter_count = pause_filter_count;
1234                 if (pause_filter_thresh)
1235                         control->pause_filter_thresh = pause_filter_thresh;
1236                 svm_set_intercept(svm, INTERCEPT_PAUSE);
1237         } else {
1238                 svm_clr_intercept(svm, INTERCEPT_PAUSE);
1239         }
1240
1241         svm_check_invpcid(svm);
1242
1243         if (kvm_vcpu_apicv_active(&svm->vcpu))
1244                 avic_init_vmcb(svm);
1245
1246         /*
1247          * If hardware supports Virtual VMLOAD VMSAVE then enable it
1248          * in VMCB and clear intercepts to avoid #VMEXIT.
1249          */
1250         if (vls) {
1251                 svm_clr_intercept(svm, INTERCEPT_VMLOAD);
1252                 svm_clr_intercept(svm, INTERCEPT_VMSAVE);
1253                 svm->vmcb->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
1254         }
1255
1256         if (vgif) {
1257                 svm_clr_intercept(svm, INTERCEPT_STGI);
1258                 svm_clr_intercept(svm, INTERCEPT_CLGI);
1259                 svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
1260         }
1261
1262         if (sev_guest(svm->vcpu.kvm)) {
1263                 svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
1264                 clr_exception_intercept(svm, UD_VECTOR);
1265         }
1266
1267         vmcb_mark_all_dirty(svm->vmcb);
1268
1269         enable_gif(svm);
1270
1271 }
1272
1273 static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
1274 {
1275         struct vcpu_svm *svm = to_svm(vcpu);
1276         u32 dummy;
1277         u32 eax = 1;
1278
1279         svm->spec_ctrl = 0;
1280         svm->virt_spec_ctrl = 0;
1281
1282         if (!init_event) {
1283                 svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE |
1284                                            MSR_IA32_APICBASE_ENABLE;
1285                 if (kvm_vcpu_is_reset_bsp(&svm->vcpu))
1286                         svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
1287         }
1288         init_vmcb(svm);
1289
1290         kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy, false);
1291         kvm_rdx_write(vcpu, eax);
1292
1293         if (kvm_vcpu_apicv_active(vcpu) && !init_event)
1294                 avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
1295 }
1296
1297 static int svm_create_vcpu(struct kvm_vcpu *vcpu)
1298 {
1299         struct vcpu_svm *svm;
1300         struct page *vmcb_page;
1301         struct page *vmsa_page = NULL;
1302         int err;
1303
1304         BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
1305         svm = to_svm(vcpu);
1306
1307         err = -ENOMEM;
1308         vmcb_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
1309         if (!vmcb_page)
1310                 goto out;
1311
1312         if (sev_es_guest(svm->vcpu.kvm)) {
1313                 /*
1314                  * SEV-ES guests require a separate VMSA page used to contain
1315                  * the encrypted register state of the guest.
1316                  */
1317                 vmsa_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
1318                 if (!vmsa_page)
1319                         goto error_free_vmcb_page;
1320         }
1321
1322         err = avic_init_vcpu(svm);
1323         if (err)
1324                 goto error_free_vmsa_page;
1325
1326         /* We initialize this flag to true to make sure that the is_running
1327          * bit would be set the first time the vcpu is loaded.
1328          */
1329         if (irqchip_in_kernel(vcpu->kvm) && kvm_apicv_activated(vcpu->kvm))
1330                 svm->avic_is_running = true;
1331
1332         svm->msrpm = svm_vcpu_alloc_msrpm();
1333         if (!svm->msrpm)
1334                 goto error_free_vmsa_page;
1335
1336         svm_vcpu_init_msrpm(vcpu, svm->msrpm);
1337
1338         svm->vmcb = page_address(vmcb_page);
1339         svm->vmcb_pa = __sme_set(page_to_pfn(vmcb_page) << PAGE_SHIFT);
1340
1341         if (vmsa_page)
1342                 svm->vmsa = page_address(vmsa_page);
1343
1344         svm->asid_generation = 0;
1345         init_vmcb(svm);
1346
1347         svm_init_osvw(vcpu);
1348         vcpu->arch.microcode_version = 0x01000065;
1349
1350         return 0;
1351
1352 error_free_vmsa_page:
1353         if (vmsa_page)
1354                 __free_page(vmsa_page);
1355 error_free_vmcb_page:
1356         __free_page(vmcb_page);
1357 out:
1358         return err;
1359 }
1360
1361 static void svm_clear_current_vmcb(struct vmcb *vmcb)
1362 {
1363         int i;
1364
1365         for_each_online_cpu(i)
1366                 cmpxchg(&per_cpu(svm_data, i)->current_vmcb, vmcb, NULL);
1367 }
1368
1369 static void svm_free_vcpu(struct kvm_vcpu *vcpu)
1370 {
1371         struct vcpu_svm *svm = to_svm(vcpu);
1372
1373         /*
1374          * The vmcb page can be recycled, causing a false negative in
1375          * svm_vcpu_load(). So, ensure that no logical CPU has this
1376          * vmcb page recorded as its current vmcb.
1377          */
1378         svm_clear_current_vmcb(svm->vmcb);
1379
1380         svm_free_nested(svm);
1381
1382         sev_free_vcpu(vcpu);
1383
1384         __free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
1385         __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
1386 }
1387
1388 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1389 {
1390         struct vcpu_svm *svm = to_svm(vcpu);
1391         struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
1392         int i;
1393
1394         if (unlikely(cpu != vcpu->cpu)) {
1395                 svm->asid_generation = 0;
1396                 vmcb_mark_all_dirty(svm->vmcb);
1397         }
1398
1399 #ifdef CONFIG_X86_64
1400         rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
1401 #endif
1402         savesegment(fs, svm->host.fs);
1403         savesegment(gs, svm->host.gs);
1404         svm->host.ldt = kvm_read_ldt();
1405
1406         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1407                 rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1408
1409         if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
1410                 u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;
1411                 if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
1412                         __this_cpu_write(current_tsc_ratio, tsc_ratio);
1413                         wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
1414                 }
1415         }
1416         /* This assumes that the kernel never uses MSR_TSC_AUX */
1417         if (static_cpu_has(X86_FEATURE_RDTSCP))
1418                 wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
1419
1420         if (sd->current_vmcb != svm->vmcb) {
1421                 sd->current_vmcb = svm->vmcb;
1422                 indirect_branch_prediction_barrier();
1423         }
1424         avic_vcpu_load(vcpu, cpu);
1425 }
1426
1427 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
1428 {
1429         struct vcpu_svm *svm = to_svm(vcpu);
1430         int i;
1431
1432         avic_vcpu_put(vcpu);
1433
1434         ++vcpu->stat.host_state_reload;
1435         kvm_load_ldt(svm->host.ldt);
1436 #ifdef CONFIG_X86_64
1437         loadsegment(fs, svm->host.fs);
1438         wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase);
1439         load_gs_index(svm->host.gs);
1440 #else
1441 #ifdef CONFIG_X86_32_LAZY_GS
1442         loadsegment(gs, svm->host.gs);
1443 #endif
1444 #endif
1445         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1446                 wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1447 }
1448
1449 static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
1450 {
1451         struct vcpu_svm *svm = to_svm(vcpu);
1452         unsigned long rflags = svm->vmcb->save.rflags;
1453
1454         if (svm->nmi_singlestep) {
1455                 /* Hide our flags if they were not set by the guest */
1456                 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
1457                         rflags &= ~X86_EFLAGS_TF;
1458                 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
1459                         rflags &= ~X86_EFLAGS_RF;
1460         }
1461         return rflags;
1462 }
1463
1464 static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1465 {
1466         if (to_svm(vcpu)->nmi_singlestep)
1467                 rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
1468
1469        /*
1470         * Any change of EFLAGS.VM is accompanied by a reload of SS
1471         * (caused by either a task switch or an inter-privilege IRET),
1472         * so we do not need to update the CPL here.
1473         */
1474         to_svm(vcpu)->vmcb->save.rflags = rflags;
1475 }
1476
1477 static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1478 {
1479         switch (reg) {
1480         case VCPU_EXREG_PDPTR:
1481                 BUG_ON(!npt_enabled);
1482                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
1483                 break;
1484         default:
1485                 WARN_ON_ONCE(1);
1486         }
1487 }
1488
1489 static void svm_set_vintr(struct vcpu_svm *svm)
1490 {
1491         struct vmcb_control_area *control;
1492
1493         /* The following fields are ignored when AVIC is enabled */
1494         WARN_ON(kvm_vcpu_apicv_active(&svm->vcpu));
1495         svm_set_intercept(svm, INTERCEPT_VINTR);
1496
1497         /*
1498          * This is just a dummy VINTR to actually cause a vmexit to happen.
1499          * Actual injection of virtual interrupts happens through EVENTINJ.
1500          */
1501         control = &svm->vmcb->control;
1502         control->int_vector = 0x0;
1503         control->int_ctl &= ~V_INTR_PRIO_MASK;
1504         control->int_ctl |= V_IRQ_MASK |
1505                 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
1506         vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
1507 }
1508
1509 static void svm_clear_vintr(struct vcpu_svm *svm)
1510 {
1511         const u32 mask = V_TPR_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK | V_INTR_MASKING_MASK;
1512         svm_clr_intercept(svm, INTERCEPT_VINTR);
1513
1514         /* Drop int_ctl fields related to VINTR injection.  */
1515         svm->vmcb->control.int_ctl &= mask;
1516         if (is_guest_mode(&svm->vcpu)) {
1517                 svm->nested.hsave->control.int_ctl &= mask;
1518
1519                 WARN_ON((svm->vmcb->control.int_ctl & V_TPR_MASK) !=
1520                         (svm->nested.ctl.int_ctl & V_TPR_MASK));
1521                 svm->vmcb->control.int_ctl |= svm->nested.ctl.int_ctl & ~mask;
1522         }
1523
1524         vmcb_mark_dirty(svm->vmcb, VMCB_INTR);
1525 }
1526
1527 static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
1528 {
1529         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1530
1531         switch (seg) {
1532         case VCPU_SREG_CS: return &save->cs;
1533         case VCPU_SREG_DS: return &save->ds;
1534         case VCPU_SREG_ES: return &save->es;
1535         case VCPU_SREG_FS: return &save->fs;
1536         case VCPU_SREG_GS: return &save->gs;
1537         case VCPU_SREG_SS: return &save->ss;
1538         case VCPU_SREG_TR: return &save->tr;
1539         case VCPU_SREG_LDTR: return &save->ldtr;
1540         }
1541         BUG();
1542         return NULL;
1543 }
1544
1545 static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1546 {
1547         struct vmcb_seg *s = svm_seg(vcpu, seg);
1548
1549         return s->base;
1550 }
1551
1552 static void svm_get_segment(struct kvm_vcpu *vcpu,
1553                             struct kvm_segment *var, int seg)
1554 {
1555         struct vmcb_seg *s = svm_seg(vcpu, seg);
1556
1557         var->base = s->base;
1558         var->limit = s->limit;
1559         var->selector = s->selector;
1560         var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
1561         var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
1562         var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
1563         var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
1564         var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
1565         var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
1566         var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
1567
1568         /*
1569          * AMD CPUs circa 2014 track the G bit for all segments except CS.
1570          * However, the SVM spec states that the G bit is not observed by the
1571          * CPU, and some VMware virtual CPUs drop the G bit for all segments.
1572          * So let's synthesize a legal G bit for all segments, this helps
1573          * running KVM nested. It also helps cross-vendor migration, because
1574          * Intel's vmentry has a check on the 'G' bit.
1575          */
1576         var->g = s->limit > 0xfffff;
1577
1578         /*
1579          * AMD's VMCB does not have an explicit unusable field, so emulate it
1580          * for cross vendor migration purposes by "not present"
1581          */
1582         var->unusable = !var->present;
1583
1584         switch (seg) {
1585         case VCPU_SREG_TR:
1586                 /*
1587                  * Work around a bug where the busy flag in the tr selector
1588                  * isn't exposed
1589                  */
1590                 var->type |= 0x2;
1591                 break;
1592         case VCPU_SREG_DS:
1593         case VCPU_SREG_ES:
1594         case VCPU_SREG_FS:
1595         case VCPU_SREG_GS:
1596                 /*
1597                  * The accessed bit must always be set in the segment
1598                  * descriptor cache, although it can be cleared in the
1599                  * descriptor, the cached bit always remains at 1. Since
1600                  * Intel has a check on this, set it here to support
1601                  * cross-vendor migration.
1602                  */
1603                 if (!var->unusable)
1604                         var->type |= 0x1;
1605                 break;
1606         case VCPU_SREG_SS:
1607                 /*
1608                  * On AMD CPUs sometimes the DB bit in the segment
1609                  * descriptor is left as 1, although the whole segment has
1610                  * been made unusable. Clear it here to pass an Intel VMX
1611                  * entry check when cross vendor migrating.
1612                  */
1613                 if (var->unusable)
1614                         var->db = 0;
1615                 /* This is symmetric with svm_set_segment() */
1616                 var->dpl = to_svm(vcpu)->vmcb->save.cpl;
1617                 break;
1618         }
1619 }
1620
1621 static int svm_get_cpl(struct kvm_vcpu *vcpu)
1622 {
1623         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1624
1625         return save->cpl;
1626 }
1627
1628 static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1629 {
1630         struct vcpu_svm *svm = to_svm(vcpu);
1631
1632         dt->size = svm->vmcb->save.idtr.limit;
1633         dt->address = svm->vmcb->save.idtr.base;
1634 }
1635
1636 static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1637 {
1638         struct vcpu_svm *svm = to_svm(vcpu);
1639
1640         svm->vmcb->save.idtr.limit = dt->size;
1641         svm->vmcb->save.idtr.base = dt->address ;
1642         vmcb_mark_dirty(svm->vmcb, VMCB_DT);
1643 }
1644
1645 static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1646 {
1647         struct vcpu_svm *svm = to_svm(vcpu);
1648
1649         dt->size = svm->vmcb->save.gdtr.limit;
1650         dt->address = svm->vmcb->save.gdtr.base;
1651 }
1652
1653 static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1654 {
1655         struct vcpu_svm *svm = to_svm(vcpu);
1656
1657         svm->vmcb->save.gdtr.limit = dt->size;
1658         svm->vmcb->save.gdtr.base = dt->address ;
1659         vmcb_mark_dirty(svm->vmcb, VMCB_DT);
1660 }
1661
1662 static void update_cr0_intercept(struct vcpu_svm *svm)
1663 {
1664         ulong gcr0;
1665         u64 *hcr0;
1666
1667         /*
1668          * SEV-ES guests must always keep the CR intercepts cleared. CR
1669          * tracking is done using the CR write traps.
1670          */
1671         if (sev_es_guest(svm->vcpu.kvm))
1672                 return;
1673
1674         gcr0 = svm->vcpu.arch.cr0;
1675         hcr0 = &svm->vmcb->save.cr0;
1676         *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
1677                 | (gcr0 & SVM_CR0_SELECTIVE_MASK);
1678
1679         vmcb_mark_dirty(svm->vmcb, VMCB_CR);
1680
1681         if (gcr0 == *hcr0) {
1682                 svm_clr_intercept(svm, INTERCEPT_CR0_READ);
1683                 svm_clr_intercept(svm, INTERCEPT_CR0_WRITE);
1684         } else {
1685                 svm_set_intercept(svm, INTERCEPT_CR0_READ);
1686                 svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
1687         }
1688 }
1689
1690 void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1691 {
1692         struct vcpu_svm *svm = to_svm(vcpu);
1693
1694 #ifdef CONFIG_X86_64
1695         if (vcpu->arch.efer & EFER_LME && !vcpu->arch.guest_state_protected) {
1696                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
1697                         vcpu->arch.efer |= EFER_LMA;
1698                         svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
1699                 }
1700
1701                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
1702                         vcpu->arch.efer &= ~EFER_LMA;
1703                         svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
1704                 }
1705         }
1706 #endif
1707         vcpu->arch.cr0 = cr0;
1708
1709         if (!npt_enabled)
1710                 cr0 |= X86_CR0_PG | X86_CR0_WP;
1711
1712         /*
1713          * re-enable caching here because the QEMU bios
1714          * does not do it - this results in some delay at
1715          * reboot
1716          */
1717         if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
1718                 cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
1719         svm->vmcb->save.cr0 = cr0;
1720         vmcb_mark_dirty(svm->vmcb, VMCB_CR);
1721         update_cr0_intercept(svm);
1722 }
1723
1724 static bool svm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1725 {
1726         return true;
1727 }
1728
1729 void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1730 {
1731         unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
1732         unsigned long old_cr4 = vcpu->arch.cr4;
1733
1734         if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
1735                 svm_flush_tlb(vcpu);
1736
1737         vcpu->arch.cr4 = cr4;
1738         if (!npt_enabled)
1739                 cr4 |= X86_CR4_PAE;
1740         cr4 |= host_cr4_mce;
1741         to_svm(vcpu)->vmcb->save.cr4 = cr4;
1742         vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
1743
1744         if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
1745                 kvm_update_cpuid_runtime(vcpu);
1746 }
1747
1748 static void svm_set_segment(struct kvm_vcpu *vcpu,
1749                             struct kvm_segment *var, int seg)
1750 {
1751         struct vcpu_svm *svm = to_svm(vcpu);
1752         struct vmcb_seg *s = svm_seg(vcpu, seg);
1753
1754         s->base = var->base;
1755         s->limit = var->limit;
1756         s->selector = var->selector;
1757         s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
1758         s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
1759         s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
1760         s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
1761         s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
1762         s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
1763         s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
1764         s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
1765
1766         /*
1767          * This is always accurate, except if SYSRET returned to a segment
1768          * with SS.DPL != 3.  Intel does not have this quirk, and always
1769          * forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
1770          * would entail passing the CPL to userspace and back.
1771          */
1772         if (seg == VCPU_SREG_SS)
1773                 /* This is symmetric with svm_get_segment() */
1774                 svm->vmcb->save.cpl = (var->dpl & 3);
1775
1776         vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
1777 }
1778
1779 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
1780 {
1781         struct vcpu_svm *svm = to_svm(vcpu);
1782
1783         clr_exception_intercept(svm, BP_VECTOR);
1784
1785         if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
1786                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
1787                         set_exception_intercept(svm, BP_VECTOR);
1788         }
1789 }
1790
1791 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
1792 {
1793         if (sd->next_asid > sd->max_asid) {
1794                 ++sd->asid_generation;
1795                 sd->next_asid = sd->min_asid;
1796                 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
1797                 vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
1798         }
1799
1800         svm->asid_generation = sd->asid_generation;
1801         svm->asid = sd->next_asid++;
1802 }
1803
1804 static void svm_set_dr6(struct vcpu_svm *svm, unsigned long value)
1805 {
1806         struct vmcb *vmcb = svm->vmcb;
1807
1808         if (svm->vcpu.arch.guest_state_protected)
1809                 return;
1810
1811         if (unlikely(value != vmcb->save.dr6)) {
1812                 vmcb->save.dr6 = value;
1813                 vmcb_mark_dirty(vmcb, VMCB_DR);
1814         }
1815 }
1816
1817 static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
1818 {
1819         struct vcpu_svm *svm = to_svm(vcpu);
1820
1821         if (vcpu->arch.guest_state_protected)
1822                 return;
1823
1824         get_debugreg(vcpu->arch.db[0], 0);
1825         get_debugreg(vcpu->arch.db[1], 1);
1826         get_debugreg(vcpu->arch.db[2], 2);
1827         get_debugreg(vcpu->arch.db[3], 3);
1828         /*
1829          * We cannot reset svm->vmcb->save.dr6 to DR6_FIXED_1|DR6_RTM here,
1830          * because db_interception might need it.  We can do it before vmentry.
1831          */
1832         vcpu->arch.dr6 = svm->vmcb->save.dr6;
1833         vcpu->arch.dr7 = svm->vmcb->save.dr7;
1834         vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
1835         set_dr_intercepts(svm);
1836 }
1837
1838 static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
1839 {
1840         struct vcpu_svm *svm = to_svm(vcpu);
1841
1842         if (vcpu->arch.guest_state_protected)
1843                 return;
1844
1845         svm->vmcb->save.dr7 = value;
1846         vmcb_mark_dirty(svm->vmcb, VMCB_DR);
1847 }
1848
1849 static int pf_interception(struct vcpu_svm *svm)
1850 {
1851         u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
1852         u64 error_code = svm->vmcb->control.exit_info_1;
1853
1854         return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
1855                         static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
1856                         svm->vmcb->control.insn_bytes : NULL,
1857                         svm->vmcb->control.insn_len);
1858 }
1859
1860 static int npf_interception(struct vcpu_svm *svm)
1861 {
1862         u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
1863         u64 error_code = svm->vmcb->control.exit_info_1;
1864
1865         trace_kvm_page_fault(fault_address, error_code);
1866         return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
1867                         static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
1868                         svm->vmcb->control.insn_bytes : NULL,
1869                         svm->vmcb->control.insn_len);
1870 }
1871
1872 static int db_interception(struct vcpu_svm *svm)
1873 {
1874         struct kvm_run *kvm_run = svm->vcpu.run;
1875         struct kvm_vcpu *vcpu = &svm->vcpu;
1876
1877         if (!(svm->vcpu.guest_debug &
1878               (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
1879                 !svm->nmi_singlestep) {
1880                 u32 payload = (svm->vmcb->save.dr6 ^ DR6_RTM) & ~DR6_FIXED_1;
1881                 kvm_queue_exception_p(&svm->vcpu, DB_VECTOR, payload);
1882                 return 1;
1883         }
1884
1885         if (svm->nmi_singlestep) {
1886                 disable_nmi_singlestep(svm);
1887                 /* Make sure we check for pending NMIs upon entry */
1888                 kvm_make_request(KVM_REQ_EVENT, vcpu);
1889         }
1890
1891         if (svm->vcpu.guest_debug &
1892             (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
1893                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
1894                 kvm_run->debug.arch.dr6 = svm->vmcb->save.dr6;
1895                 kvm_run->debug.arch.dr7 = svm->vmcb->save.dr7;
1896                 kvm_run->debug.arch.pc =
1897                         svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1898                 kvm_run->debug.arch.exception = DB_VECTOR;
1899                 return 0;
1900         }
1901
1902         return 1;
1903 }
1904
1905 static int bp_interception(struct vcpu_svm *svm)
1906 {
1907         struct kvm_run *kvm_run = svm->vcpu.run;
1908
1909         kvm_run->exit_reason = KVM_EXIT_DEBUG;
1910         kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1911         kvm_run->debug.arch.exception = BP_VECTOR;
1912         return 0;
1913 }
1914
1915 static int ud_interception(struct vcpu_svm *svm)
1916 {
1917         return handle_ud(&svm->vcpu);
1918 }
1919
1920 static int ac_interception(struct vcpu_svm *svm)
1921 {
1922         kvm_queue_exception_e(&svm->vcpu, AC_VECTOR, 0);
1923         return 1;
1924 }
1925
1926 static int gp_interception(struct vcpu_svm *svm)
1927 {
1928         struct kvm_vcpu *vcpu = &svm->vcpu;
1929         u32 error_code = svm->vmcb->control.exit_info_1;
1930
1931         WARN_ON_ONCE(!enable_vmware_backdoor);
1932
1933         /*
1934          * VMware backdoor emulation on #GP interception only handles IN{S},
1935          * OUT{S}, and RDPMC, none of which generate a non-zero error code.
1936          */
1937         if (error_code) {
1938                 kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
1939                 return 1;
1940         }
1941         return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP);
1942 }
1943
1944 static bool is_erratum_383(void)
1945 {
1946         int err, i;
1947         u64 value;
1948
1949         if (!erratum_383_found)
1950                 return false;
1951
1952         value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
1953         if (err)
1954                 return false;
1955
1956         /* Bit 62 may or may not be set for this mce */
1957         value &= ~(1ULL << 62);
1958
1959         if (value != 0xb600000000010015ULL)
1960                 return false;
1961
1962         /* Clear MCi_STATUS registers */
1963         for (i = 0; i < 6; ++i)
1964                 native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);
1965
1966         value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
1967         if (!err) {
1968                 u32 low, high;
1969
1970                 value &= ~(1ULL << 2);
1971                 low    = lower_32_bits(value);
1972                 high   = upper_32_bits(value);
1973
1974                 native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
1975         }
1976
1977         /* Flush tlb to evict multi-match entries */
1978         __flush_tlb_all();
1979
1980         return true;
1981 }
1982
1983 static void svm_handle_mce(struct vcpu_svm *svm)
1984 {
1985         if (is_erratum_383()) {
1986                 /*
1987                  * Erratum 383 triggered. Guest state is corrupt so kill the
1988                  * guest.
1989                  */
1990                 pr_err("KVM: Guest triggered AMD Erratum 383\n");
1991
1992                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
1993
1994                 return;
1995         }
1996
1997         /*
1998          * On an #MC intercept the MCE handler is not called automatically in
1999          * the host. So do it by hand here.
2000          */
2001         kvm_machine_check();
2002 }
2003
2004 static int mc_interception(struct vcpu_svm *svm)
2005 {
2006         return 1;
2007 }
2008
2009 static int shutdown_interception(struct vcpu_svm *svm)
2010 {
2011         struct kvm_run *kvm_run = svm->vcpu.run;
2012
2013         /*
2014          * The VM save area has already been encrypted so it
2015          * cannot be reinitialized - just terminate.
2016          */
2017         if (sev_es_guest(svm->vcpu.kvm))
2018                 return -EINVAL;
2019
2020         /*
2021          * VMCB is undefined after a SHUTDOWN intercept
2022          * so reinitialize it.
2023          */
2024         clear_page(svm->vmcb);
2025         init_vmcb(svm);
2026
2027         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2028         return 0;
2029 }
2030
2031 static int io_interception(struct vcpu_svm *svm)
2032 {
2033         struct kvm_vcpu *vcpu = &svm->vcpu;
2034         u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
2035         int size, in, string;
2036         unsigned port;
2037
2038         ++svm->vcpu.stat.io_exits;
2039         string = (io_info & SVM_IOIO_STR_MASK) != 0;
2040         in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
2041         port = io_info >> 16;
2042         size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
2043
2044         if (string) {
2045                 if (sev_es_guest(vcpu->kvm))
2046                         return sev_es_string_io(svm, size, port, in);
2047                 else
2048                         return kvm_emulate_instruction(vcpu, 0);
2049         }
2050
2051         svm->next_rip = svm->vmcb->control.exit_info_2;
2052
2053         return kvm_fast_pio(&svm->vcpu, size, port, in);
2054 }
2055
2056 static int nmi_interception(struct vcpu_svm *svm)
2057 {
2058         return 1;
2059 }
2060
2061 static int intr_interception(struct vcpu_svm *svm)
2062 {
2063         ++svm->vcpu.stat.irq_exits;
2064         return 1;
2065 }
2066
2067 static int nop_on_interception(struct vcpu_svm *svm)
2068 {
2069         return 1;
2070 }
2071
2072 static int halt_interception(struct vcpu_svm *svm)
2073 {
2074         return kvm_emulate_halt(&svm->vcpu);
2075 }
2076
2077 static int vmmcall_interception(struct vcpu_svm *svm)
2078 {
2079         return kvm_emulate_hypercall(&svm->vcpu);
2080 }
2081
2082 static int vmload_interception(struct vcpu_svm *svm)
2083 {
2084         struct vmcb *nested_vmcb;
2085         struct kvm_host_map map;
2086         int ret;
2087
2088         if (nested_svm_check_permissions(svm))
2089                 return 1;
2090
2091         ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
2092         if (ret) {
2093                 if (ret == -EINVAL)
2094                         kvm_inject_gp(&svm->vcpu, 0);
2095                 return 1;
2096         }
2097
2098         nested_vmcb = map.hva;
2099
2100         ret = kvm_skip_emulated_instruction(&svm->vcpu);
2101
2102         nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
2103         kvm_vcpu_unmap(&svm->vcpu, &map, true);
2104
2105         return ret;
2106 }
2107
2108 static int vmsave_interception(struct vcpu_svm *svm)
2109 {
2110         struct vmcb *nested_vmcb;
2111         struct kvm_host_map map;
2112         int ret;
2113
2114         if (nested_svm_check_permissions(svm))
2115                 return 1;
2116
2117         ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
2118         if (ret) {
2119                 if (ret == -EINVAL)
2120                         kvm_inject_gp(&svm->vcpu, 0);
2121                 return 1;
2122         }
2123
2124         nested_vmcb = map.hva;
2125
2126         ret = kvm_skip_emulated_instruction(&svm->vcpu);
2127
2128         nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
2129         kvm_vcpu_unmap(&svm->vcpu, &map, true);
2130
2131         return ret;
2132 }
2133
2134 static int vmrun_interception(struct vcpu_svm *svm)
2135 {
2136         if (nested_svm_check_permissions(svm))
2137                 return 1;
2138
2139         return nested_svm_vmrun(svm);
2140 }
2141
2142 void svm_set_gif(struct vcpu_svm *svm, bool value)
2143 {
2144         if (value) {
2145                 /*
2146                  * If VGIF is enabled, the STGI intercept is only added to
2147                  * detect the opening of the SMI/NMI window; remove it now.
2148                  * Likewise, clear the VINTR intercept, we will set it
2149                  * again while processing KVM_REQ_EVENT if needed.
2150                  */
2151                 if (vgif_enabled(svm))
2152                         svm_clr_intercept(svm, INTERCEPT_STGI);
2153                 if (svm_is_intercept(svm, INTERCEPT_VINTR))
2154                         svm_clear_vintr(svm);
2155
2156                 enable_gif(svm);
2157                 if (svm->vcpu.arch.smi_pending ||
2158                     svm->vcpu.arch.nmi_pending ||
2159                     kvm_cpu_has_injectable_intr(&svm->vcpu))
2160                         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
2161         } else {
2162                 disable_gif(svm);
2163
2164                 /*
2165                  * After a CLGI no interrupts should come.  But if vGIF is
2166                  * in use, we still rely on the VINTR intercept (rather than
2167                  * STGI) to detect an open interrupt window.
2168                 */
2169                 if (!vgif_enabled(svm))
2170                         svm_clear_vintr(svm);
2171         }
2172 }
2173
2174 static int stgi_interception(struct vcpu_svm *svm)
2175 {
2176         int ret;
2177
2178         if (nested_svm_check_permissions(svm))
2179                 return 1;
2180
2181         ret = kvm_skip_emulated_instruction(&svm->vcpu);
2182         svm_set_gif(svm, true);
2183         return ret;
2184 }
2185
2186 static int clgi_interception(struct vcpu_svm *svm)
2187 {
2188         int ret;
2189
2190         if (nested_svm_check_permissions(svm))
2191                 return 1;
2192
2193         ret = kvm_skip_emulated_instruction(&svm->vcpu);
2194         svm_set_gif(svm, false);
2195         return ret;
2196 }
2197
2198 static int invlpga_interception(struct vcpu_svm *svm)
2199 {
2200         struct kvm_vcpu *vcpu = &svm->vcpu;
2201
2202         trace_kvm_invlpga(svm->vmcb->save.rip, kvm_rcx_read(&svm->vcpu),
2203                           kvm_rax_read(&svm->vcpu));
2204
2205         /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
2206         kvm_mmu_invlpg(vcpu, kvm_rax_read(&svm->vcpu));
2207
2208         return kvm_skip_emulated_instruction(&svm->vcpu);
2209 }
2210
2211 static int skinit_interception(struct vcpu_svm *svm)
2212 {
2213         trace_kvm_skinit(svm->vmcb->save.rip, kvm_rax_read(&svm->vcpu));
2214
2215         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2216         return 1;
2217 }
2218
2219 static int wbinvd_interception(struct vcpu_svm *svm)
2220 {
2221         return kvm_emulate_wbinvd(&svm->vcpu);
2222 }
2223
2224 static int xsetbv_interception(struct vcpu_svm *svm)
2225 {
2226         u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
2227         u32 index = kvm_rcx_read(&svm->vcpu);
2228
2229         if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
2230                 return kvm_skip_emulated_instruction(&svm->vcpu);
2231         }
2232
2233         return 1;
2234 }
2235
2236 static int rdpru_interception(struct vcpu_svm *svm)
2237 {
2238         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2239         return 1;
2240 }
2241
2242 static int task_switch_interception(struct vcpu_svm *svm)
2243 {
2244         u16 tss_selector;
2245         int reason;
2246         int int_type = svm->vmcb->control.exit_int_info &
2247                 SVM_EXITINTINFO_TYPE_MASK;
2248         int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
2249         uint32_t type =
2250                 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
2251         uint32_t idt_v =
2252                 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
2253         bool has_error_code = false;
2254         u32 error_code = 0;
2255
2256         tss_selector = (u16)svm->vmcb->control.exit_info_1;
2257
2258         if (svm->vmcb->control.exit_info_2 &
2259             (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
2260                 reason = TASK_SWITCH_IRET;
2261         else if (svm->vmcb->control.exit_info_2 &
2262                  (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
2263                 reason = TASK_SWITCH_JMP;
2264         else if (idt_v)
2265                 reason = TASK_SWITCH_GATE;
2266         else
2267                 reason = TASK_SWITCH_CALL;
2268
2269         if (reason == TASK_SWITCH_GATE) {
2270                 switch (type) {
2271                 case SVM_EXITINTINFO_TYPE_NMI:
2272                         svm->vcpu.arch.nmi_injected = false;
2273                         break;
2274                 case SVM_EXITINTINFO_TYPE_EXEPT:
2275                         if (svm->vmcb->control.exit_info_2 &
2276                             (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
2277                                 has_error_code = true;
2278                                 error_code =
2279                                         (u32)svm->vmcb->control.exit_info_2;
2280                         }
2281                         kvm_clear_exception_queue(&svm->vcpu);
2282                         break;
2283                 case SVM_EXITINTINFO_TYPE_INTR:
2284                         kvm_clear_interrupt_queue(&svm->vcpu);
2285                         break;
2286                 default:
2287                         break;
2288                 }
2289         }
2290
2291         if (reason != TASK_SWITCH_GATE ||
2292             int_type == SVM_EXITINTINFO_TYPE_SOFT ||
2293             (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
2294              (int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
2295                 if (!skip_emulated_instruction(&svm->vcpu))
2296                         return 0;
2297         }
2298
2299         if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
2300                 int_vec = -1;
2301
2302         return kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
2303                                has_error_code, error_code);
2304 }
2305
2306 static int cpuid_interception(struct vcpu_svm *svm)
2307 {
2308         return kvm_emulate_cpuid(&svm->vcpu);
2309 }
2310
2311 static int iret_interception(struct vcpu_svm *svm)
2312 {
2313         ++svm->vcpu.stat.nmi_window_exits;
2314         svm_clr_intercept(svm, INTERCEPT_IRET);
2315         svm->vcpu.arch.hflags |= HF_IRET_MASK;
2316         svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
2317         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
2318         return 1;
2319 }
2320
2321 static int invd_interception(struct vcpu_svm *svm)
2322 {
2323         /* Treat an INVD instruction as a NOP and just skip it. */
2324         return kvm_skip_emulated_instruction(&svm->vcpu);
2325 }
2326
2327 static int invlpg_interception(struct vcpu_svm *svm)
2328 {
2329         if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
2330                 return kvm_emulate_instruction(&svm->vcpu, 0);
2331
2332         kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
2333         return kvm_skip_emulated_instruction(&svm->vcpu);
2334 }
2335
2336 static int emulate_on_interception(struct vcpu_svm *svm)
2337 {
2338         return kvm_emulate_instruction(&svm->vcpu, 0);
2339 }
2340
2341 static int rsm_interception(struct vcpu_svm *svm)
2342 {
2343         return kvm_emulate_instruction_from_buffer(&svm->vcpu, rsm_ins_bytes, 2);
2344 }
2345
2346 static int rdpmc_interception(struct vcpu_svm *svm)
2347 {
2348         int err;
2349
2350         if (!nrips)
2351                 return emulate_on_interception(svm);
2352
2353         err = kvm_rdpmc(&svm->vcpu);
2354         return kvm_complete_insn_gp(&svm->vcpu, err);
2355 }
2356
2357 static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
2358                                             unsigned long val)
2359 {
2360         unsigned long cr0 = svm->vcpu.arch.cr0;
2361         bool ret = false;
2362
2363         if (!is_guest_mode(&svm->vcpu) ||
2364             (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0))))
2365                 return false;
2366
2367         cr0 &= ~SVM_CR0_SELECTIVE_MASK;
2368         val &= ~SVM_CR0_SELECTIVE_MASK;
2369
2370         if (cr0 ^ val) {
2371                 svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
2372                 ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
2373         }
2374
2375         return ret;
2376 }
2377
2378 #define CR_VALID (1ULL << 63)
2379
2380 static int cr_interception(struct vcpu_svm *svm)
2381 {
2382         int reg, cr;
2383         unsigned long val;
2384         int err;
2385
2386         if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
2387                 return emulate_on_interception(svm);
2388
2389         if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
2390                 return emulate_on_interception(svm);
2391
2392         reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
2393         if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE)
2394                 cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0;
2395         else
2396                 cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;
2397
2398         err = 0;
2399         if (cr >= 16) { /* mov to cr */
2400                 cr -= 16;
2401                 val = kvm_register_read(&svm->vcpu, reg);
2402                 trace_kvm_cr_write(cr, val);
2403                 switch (cr) {
2404                 case 0:
2405                         if (!check_selective_cr0_intercepted(svm, val))
2406                                 err = kvm_set_cr0(&svm->vcpu, val);
2407                         else
2408                                 return 1;
2409
2410                         break;
2411                 case 3:
2412                         err = kvm_set_cr3(&svm->vcpu, val);
2413                         break;
2414                 case 4:
2415                         err = kvm_set_cr4(&svm->vcpu, val);
2416                         break;
2417                 case 8:
2418                         err = kvm_set_cr8(&svm->vcpu, val);
2419                         break;
2420                 default:
2421                         WARN(1, "unhandled write to CR%d", cr);
2422                         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2423                         return 1;
2424                 }
2425         } else { /* mov from cr */
2426                 switch (cr) {
2427                 case 0:
2428                         val = kvm_read_cr0(&svm->vcpu);
2429                         break;
2430                 case 2:
2431                         val = svm->vcpu.arch.cr2;
2432                         break;
2433                 case 3:
2434                         val = kvm_read_cr3(&svm->vcpu);
2435                         break;
2436                 case 4:
2437                         val = kvm_read_cr4(&svm->vcpu);
2438                         break;
2439                 case 8:
2440                         val = kvm_get_cr8(&svm->vcpu);
2441                         break;
2442                 default:
2443                         WARN(1, "unhandled read from CR%d", cr);
2444                         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2445                         return 1;
2446                 }
2447                 kvm_register_write(&svm->vcpu, reg, val);
2448                 trace_kvm_cr_read(cr, val);
2449         }
2450         return kvm_complete_insn_gp(&svm->vcpu, err);
2451 }
2452
2453 static int cr_trap(struct vcpu_svm *svm)
2454 {
2455         struct kvm_vcpu *vcpu = &svm->vcpu;
2456         unsigned long old_value, new_value;
2457         unsigned int cr;
2458
2459         new_value = (unsigned long)svm->vmcb->control.exit_info_1;
2460
2461         cr = svm->vmcb->control.exit_code - SVM_EXIT_CR0_WRITE_TRAP;
2462         switch (cr) {
2463         case 0:
2464                 old_value = kvm_read_cr0(vcpu);
2465                 svm_set_cr0(vcpu, new_value);
2466
2467                 kvm_post_set_cr0(vcpu, old_value, new_value);
2468                 break;
2469         case 4:
2470                 old_value = kvm_read_cr4(vcpu);
2471                 svm_set_cr4(vcpu, new_value);
2472
2473                 kvm_post_set_cr4(vcpu, old_value, new_value);
2474                 break;
2475         default:
2476                 WARN(1, "unhandled CR%d write trap", cr);
2477                 kvm_queue_exception(vcpu, UD_VECTOR);
2478                 return 1;
2479         }
2480
2481         return kvm_complete_insn_gp(vcpu, 0);
2482 }
2483
2484 static int dr_interception(struct vcpu_svm *svm)
2485 {
2486         int reg, dr;
2487         unsigned long val;
2488
2489         if (svm->vcpu.guest_debug == 0) {
2490                 /*
2491                  * No more DR vmexits; force a reload of the debug registers
2492                  * and reenter on this instruction.  The next vmexit will
2493                  * retrieve the full state of the debug registers.
2494                  */
2495                 clr_dr_intercepts(svm);
2496                 svm->vcpu.arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
2497                 return 1;
2498         }
2499
2500         if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
2501                 return emulate_on_interception(svm);
2502
2503         reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
2504         dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
2505
2506         if (dr >= 16) { /* mov to DRn */
2507                 if (!kvm_require_dr(&svm->vcpu, dr - 16))
2508                         return 1;
2509                 val = kvm_register_read(&svm->vcpu, reg);
2510                 kvm_set_dr(&svm->vcpu, dr - 16, val);
2511         } else {
2512                 if (!kvm_require_dr(&svm->vcpu, dr))
2513                         return 1;
2514                 kvm_get_dr(&svm->vcpu, dr, &val);
2515                 kvm_register_write(&svm->vcpu, reg, val);
2516         }
2517
2518         return kvm_skip_emulated_instruction(&svm->vcpu);
2519 }
2520
2521 static int cr8_write_interception(struct vcpu_svm *svm)
2522 {
2523         struct kvm_run *kvm_run = svm->vcpu.run;
2524         int r;
2525
2526         u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
2527         /* instruction emulation calls kvm_set_cr8() */
2528         r = cr_interception(svm);
2529         if (lapic_in_kernel(&svm->vcpu))
2530                 return r;
2531         if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
2532                 return r;
2533         kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2534         return 0;
2535 }
2536
2537 static int efer_trap(struct vcpu_svm *svm)
2538 {
2539         struct msr_data msr_info;
2540         int ret;
2541
2542         /*
2543          * Clear the EFER_SVME bit from EFER. The SVM code always sets this
2544          * bit in svm_set_efer(), but __kvm_valid_efer() checks it against
2545          * whether the guest has X86_FEATURE_SVM - this avoids a failure if
2546          * the guest doesn't have X86_FEATURE_SVM.
2547          */
2548         msr_info.host_initiated = false;
2549         msr_info.index = MSR_EFER;
2550         msr_info.data = svm->vmcb->control.exit_info_1 & ~EFER_SVME;
2551         ret = kvm_set_msr_common(&svm->vcpu, &msr_info);
2552
2553         return kvm_complete_insn_gp(&svm->vcpu, ret);
2554 }
2555
2556 static int svm_get_msr_feature(struct kvm_msr_entry *msr)
2557 {
2558         msr->data = 0;
2559
2560         switch (msr->index) {
2561         case MSR_F10H_DECFG:
2562                 if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC))
2563                         msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE;
2564                 break;
2565         case MSR_IA32_PERF_CAPABILITIES:
2566                 return 0;
2567         default:
2568                 return KVM_MSR_RET_INVALID;
2569         }
2570
2571         return 0;
2572 }
2573
2574 static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
2575 {
2576         struct vcpu_svm *svm = to_svm(vcpu);
2577
2578         switch (msr_info->index) {
2579         case MSR_STAR:
2580                 msr_info->data = svm->vmcb->save.star;
2581                 break;
2582 #ifdef CONFIG_X86_64
2583         case MSR_LSTAR:
2584                 msr_info->data = svm->vmcb->save.lstar;
2585                 break;
2586         case MSR_CSTAR:
2587                 msr_info->data = svm->vmcb->save.cstar;
2588                 break;
2589         case MSR_KERNEL_GS_BASE:
2590                 msr_info->data = svm->vmcb->save.kernel_gs_base;
2591                 break;
2592         case MSR_SYSCALL_MASK:
2593                 msr_info->data = svm->vmcb->save.sfmask;
2594                 break;
2595 #endif
2596         case MSR_IA32_SYSENTER_CS:
2597                 msr_info->data = svm->vmcb->save.sysenter_cs;
2598                 break;
2599         case MSR_IA32_SYSENTER_EIP:
2600                 msr_info->data = svm->sysenter_eip;
2601                 break;
2602         case MSR_IA32_SYSENTER_ESP:
2603                 msr_info->data = svm->sysenter_esp;
2604                 break;
2605         case MSR_TSC_AUX:
2606                 if (!boot_cpu_has(X86_FEATURE_RDTSCP))
2607                         return 1;
2608                 msr_info->data = svm->tsc_aux;
2609                 break;
2610         /*
2611          * Nobody will change the following 5 values in the VMCB so we can
2612          * safely return them on rdmsr. They will always be 0 until LBRV is
2613          * implemented.
2614          */
2615         case MSR_IA32_DEBUGCTLMSR:
2616                 msr_info->data = svm->vmcb->save.dbgctl;
2617                 break;
2618         case MSR_IA32_LASTBRANCHFROMIP:
2619                 msr_info->data = svm->vmcb->save.br_from;
2620                 break;
2621         case MSR_IA32_LASTBRANCHTOIP:
2622                 msr_info->data = svm->vmcb->save.br_to;
2623                 break;
2624         case MSR_IA32_LASTINTFROMIP:
2625                 msr_info->data = svm->vmcb->save.last_excp_from;
2626                 break;
2627         case MSR_IA32_LASTINTTOIP:
2628                 msr_info->data = svm->vmcb->save.last_excp_to;
2629                 break;
2630         case MSR_VM_HSAVE_PA:
2631                 msr_info->data = svm->nested.hsave_msr;
2632                 break;
2633         case MSR_VM_CR:
2634                 msr_info->data = svm->nested.vm_cr_msr;
2635                 break;
2636         case MSR_IA32_SPEC_CTRL:
2637                 if (!msr_info->host_initiated &&
2638                     !guest_has_spec_ctrl_msr(vcpu))
2639                         return 1;
2640
2641                 msr_info->data = svm->spec_ctrl;
2642                 break;
2643         case MSR_AMD64_VIRT_SPEC_CTRL:
2644                 if (!msr_info->host_initiated &&
2645                     !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD))
2646                         return 1;
2647
2648                 msr_info->data = svm->virt_spec_ctrl;
2649                 break;
2650         case MSR_F15H_IC_CFG: {
2651
2652                 int family, model;
2653
2654                 family = guest_cpuid_family(vcpu);
2655                 model  = guest_cpuid_model(vcpu);
2656
2657                 if (family < 0 || model < 0)
2658                         return kvm_get_msr_common(vcpu, msr_info);
2659
2660                 msr_info->data = 0;
2661
2662                 if (family == 0x15 &&
2663                     (model >= 0x2 && model < 0x20))
2664                         msr_info->data = 0x1E;
2665                 }
2666                 break;
2667         case MSR_F10H_DECFG:
2668                 msr_info->data = svm->msr_decfg;
2669                 break;
2670         default:
2671                 return kvm_get_msr_common(vcpu, msr_info);
2672         }
2673         return 0;
2674 }
2675
2676 static int svm_complete_emulated_msr(struct kvm_vcpu *vcpu, int err)
2677 {
2678         struct vcpu_svm *svm = to_svm(vcpu);
2679         if (!sev_es_guest(svm->vcpu.kvm) || !err)
2680                 return kvm_complete_insn_gp(&svm->vcpu, err);
2681
2682         ghcb_set_sw_exit_info_1(svm->ghcb, 1);
2683         ghcb_set_sw_exit_info_2(svm->ghcb,
2684                                 X86_TRAP_GP |
2685                                 SVM_EVTINJ_TYPE_EXEPT |
2686                                 SVM_EVTINJ_VALID);
2687         return 1;
2688 }
2689
2690 static int rdmsr_interception(struct vcpu_svm *svm)
2691 {
2692         return kvm_emulate_rdmsr(&svm->vcpu);
2693 }
2694
2695 static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
2696 {
2697         struct vcpu_svm *svm = to_svm(vcpu);
2698         int svm_dis, chg_mask;
2699
2700         if (data & ~SVM_VM_CR_VALID_MASK)
2701                 return 1;
2702
2703         chg_mask = SVM_VM_CR_VALID_MASK;
2704
2705         if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
2706                 chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
2707
2708         svm->nested.vm_cr_msr &= ~chg_mask;
2709         svm->nested.vm_cr_msr |= (data & chg_mask);
2710
2711         svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
2712
2713         /* check for svm_disable while efer.svme is set */
2714         if (svm_dis && (vcpu->arch.efer & EFER_SVME))
2715                 return 1;
2716
2717         return 0;
2718 }
2719
2720 static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
2721 {
2722         struct vcpu_svm *svm = to_svm(vcpu);
2723
2724         u32 ecx = msr->index;
2725         u64 data = msr->data;
2726         switch (ecx) {
2727         case MSR_IA32_CR_PAT:
2728                 if (!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, data))
2729                         return 1;
2730                 vcpu->arch.pat = data;
2731                 svm->vmcb->save.g_pat = data;
2732                 vmcb_mark_dirty(svm->vmcb, VMCB_NPT);
2733                 break;
2734         case MSR_IA32_SPEC_CTRL:
2735                 if (!msr->host_initiated &&
2736                     !guest_has_spec_ctrl_msr(vcpu))
2737                         return 1;
2738
2739                 if (kvm_spec_ctrl_test_value(data))
2740                         return 1;
2741
2742                 svm->spec_ctrl = data;
2743                 if (!data)
2744                         break;
2745
2746                 /*
2747                  * For non-nested:
2748                  * When it's written (to non-zero) for the first time, pass
2749                  * it through.
2750                  *
2751                  * For nested:
2752                  * The handling of the MSR bitmap for L2 guests is done in
2753                  * nested_svm_vmrun_msrpm.
2754                  * We update the L1 MSR bit as well since it will end up
2755                  * touching the MSR anyway now.
2756                  */
2757                 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
2758                 break;
2759         case MSR_IA32_PRED_CMD:
2760                 if (!msr->host_initiated &&
2761                     !guest_has_pred_cmd_msr(vcpu))
2762                         return 1;
2763
2764                 if (data & ~PRED_CMD_IBPB)
2765                         return 1;
2766                 if (!boot_cpu_has(X86_FEATURE_IBPB))
2767                         return 1;
2768                 if (!data)
2769                         break;
2770
2771                 wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
2772                 set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
2773                 break;
2774         case MSR_AMD64_VIRT_SPEC_CTRL:
2775                 if (!msr->host_initiated &&
2776                     !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD))
2777                         return 1;
2778
2779                 if (data & ~SPEC_CTRL_SSBD)
2780                         return 1;
2781
2782                 svm->virt_spec_ctrl = data;
2783                 break;
2784         case MSR_STAR:
2785                 svm->vmcb->save.star = data;
2786                 break;
2787 #ifdef CONFIG_X86_64
2788         case MSR_LSTAR:
2789                 svm->vmcb->save.lstar = data;
2790                 break;
2791         case MSR_CSTAR:
2792                 svm->vmcb->save.cstar = data;
2793                 break;
2794         case MSR_KERNEL_GS_BASE:
2795                 svm->vmcb->save.kernel_gs_base = data;
2796                 break;
2797         case MSR_SYSCALL_MASK:
2798                 svm->vmcb->save.sfmask = data;
2799                 break;
2800 #endif
2801         case MSR_IA32_SYSENTER_CS:
2802                 svm->vmcb->save.sysenter_cs = data;
2803                 break;
2804         case MSR_IA32_SYSENTER_EIP:
2805                 svm->sysenter_eip = data;
2806                 svm->vmcb->save.sysenter_eip = data;
2807                 break;
2808         case MSR_IA32_SYSENTER_ESP:
2809                 svm->sysenter_esp = data;
2810                 svm->vmcb->save.sysenter_esp = data;
2811                 break;
2812         case MSR_TSC_AUX:
2813                 if (!boot_cpu_has(X86_FEATURE_RDTSCP))
2814                         return 1;
2815
2816                 /*
2817                  * This is rare, so we update the MSR here instead of using
2818                  * direct_access_msrs.  Doing that would require a rdmsr in
2819                  * svm_vcpu_put.
2820                  */
2821                 svm->tsc_aux = data;
2822                 wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
2823                 break;
2824         case MSR_IA32_DEBUGCTLMSR:
2825                 if (!boot_cpu_has(X86_FEATURE_LBRV)) {
2826                         vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
2827                                     __func__, data);
2828                         break;
2829                 }
2830                 if (data & DEBUGCTL_RESERVED_BITS)
2831                         return 1;
2832
2833                 svm->vmcb->save.dbgctl = data;
2834                 vmcb_mark_dirty(svm->vmcb, VMCB_LBR);
2835                 if (data & (1ULL<<0))
2836                         svm_enable_lbrv(vcpu);
2837                 else
2838                         svm_disable_lbrv(vcpu);
2839                 break;
2840         case MSR_VM_HSAVE_PA:
2841                 svm->nested.hsave_msr = data;
2842                 break;
2843         case MSR_VM_CR:
2844                 return svm_set_vm_cr(vcpu, data);
2845         case MSR_VM_IGNNE:
2846                 vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
2847                 break;
2848         case MSR_F10H_DECFG: {
2849                 struct kvm_msr_entry msr_entry;
2850
2851                 msr_entry.index = msr->index;
2852                 if (svm_get_msr_feature(&msr_entry))
2853                         return 1;
2854
2855                 /* Check the supported bits */
2856                 if (data & ~msr_entry.data)
2857                         return 1;
2858
2859                 /* Don't allow the guest to change a bit, #GP */
2860                 if (!msr->host_initiated && (data ^ msr_entry.data))
2861                         return 1;
2862
2863                 svm->msr_decfg = data;
2864                 break;
2865         }
2866         case MSR_IA32_APICBASE:
2867                 if (kvm_vcpu_apicv_active(vcpu))
2868                         avic_update_vapic_bar(to_svm(vcpu), data);
2869                 fallthrough;
2870         default:
2871                 return kvm_set_msr_common(vcpu, msr);
2872         }
2873         return 0;
2874 }
2875
2876 static int wrmsr_interception(struct vcpu_svm *svm)
2877 {
2878         return kvm_emulate_wrmsr(&svm->vcpu);
2879 }
2880
2881 static int msr_interception(struct vcpu_svm *svm)
2882 {
2883         if (svm->vmcb->control.exit_info_1)
2884                 return wrmsr_interception(svm);
2885         else
2886                 return rdmsr_interception(svm);
2887 }
2888
2889 static int interrupt_window_interception(struct vcpu_svm *svm)
2890 {
2891         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
2892         svm_clear_vintr(svm);
2893
2894         /*
2895          * For AVIC, the only reason to end up here is ExtINTs.
2896          * In this case AVIC was temporarily disabled for
2897          * requesting the IRQ window and we have to re-enable it.
2898          */
2899         svm_toggle_avic_for_irq_window(&svm->vcpu, true);
2900
2901         ++svm->vcpu.stat.irq_window_exits;
2902         return 1;
2903 }
2904
2905 static int pause_interception(struct vcpu_svm *svm)
2906 {
2907         struct kvm_vcpu *vcpu = &svm->vcpu;
2908         bool in_kernel;
2909
2910         /*
2911          * CPL is not made available for an SEV-ES guest, therefore
2912          * vcpu->arch.preempted_in_kernel can never be true.  Just
2913          * set in_kernel to false as well.
2914          */
2915         in_kernel = !sev_es_guest(svm->vcpu.kvm) && svm_get_cpl(vcpu) == 0;
2916
2917         if (!kvm_pause_in_guest(vcpu->kvm))
2918                 grow_ple_window(vcpu);
2919
2920         kvm_vcpu_on_spin(vcpu, in_kernel);
2921         return 1;
2922 }
2923
2924 static int nop_interception(struct vcpu_svm *svm)
2925 {
2926         return kvm_skip_emulated_instruction(&(svm->vcpu));
2927 }
2928
2929 static int monitor_interception(struct vcpu_svm *svm)
2930 {
2931         printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
2932         return nop_interception(svm);
2933 }
2934
2935 static int mwait_interception(struct vcpu_svm *svm)
2936 {
2937         printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n");
2938         return nop_interception(svm);
2939 }
2940
2941 static int invpcid_interception(struct vcpu_svm *svm)
2942 {
2943         struct kvm_vcpu *vcpu = &svm->vcpu;
2944         unsigned long type;
2945         gva_t gva;
2946
2947         if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) {
2948                 kvm_queue_exception(vcpu, UD_VECTOR);
2949                 return 1;
2950         }
2951
2952         /*
2953          * For an INVPCID intercept:
2954          * EXITINFO1 provides the linear address of the memory operand.
2955          * EXITINFO2 provides the contents of the register operand.
2956          */
2957         type = svm->vmcb->control.exit_info_2;
2958         gva = svm->vmcb->control.exit_info_1;
2959
2960         if (type > 3) {
2961                 kvm_inject_gp(vcpu, 0);
2962                 return 1;
2963         }
2964
2965         return kvm_handle_invpcid(vcpu, type, gva);
2966 }
2967
2968 static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
2969         [SVM_EXIT_READ_CR0]                     = cr_interception,
2970         [SVM_EXIT_READ_CR3]                     = cr_interception,
2971         [SVM_EXIT_READ_CR4]                     = cr_interception,
2972         [SVM_EXIT_READ_CR8]                     = cr_interception,
2973         [SVM_EXIT_CR0_SEL_WRITE]                = cr_interception,
2974         [SVM_EXIT_WRITE_CR0]                    = cr_interception,
2975         [SVM_EXIT_WRITE_CR3]                    = cr_interception,
2976         [SVM_EXIT_WRITE_CR4]                    = cr_interception,
2977         [SVM_EXIT_WRITE_CR8]                    = cr8_write_interception,
2978         [SVM_EXIT_READ_DR0]                     = dr_interception,
2979         [SVM_EXIT_READ_DR1]                     = dr_interception,
2980         [SVM_EXIT_READ_DR2]                     = dr_interception,
2981         [SVM_EXIT_READ_DR3]                     = dr_interception,
2982         [SVM_EXIT_READ_DR4]                     = dr_interception,
2983         [SVM_EXIT_READ_DR5]                     = dr_interception,
2984         [SVM_EXIT_READ_DR6]                     = dr_interception,
2985         [SVM_EXIT_READ_DR7]                     = dr_interception,
2986         [SVM_EXIT_WRITE_DR0]                    = dr_interception,
2987         [SVM_EXIT_WRITE_DR1]                    = dr_interception,
2988         [SVM_EXIT_WRITE_DR2]                    = dr_interception,
2989         [SVM_EXIT_WRITE_DR3]                    = dr_interception,
2990         [SVM_EXIT_WRITE_DR4]                    = dr_interception,
2991         [SVM_EXIT_WRITE_DR5]                    = dr_interception,
2992         [SVM_EXIT_WRITE_DR6]                    = dr_interception,
2993         [SVM_EXIT_WRITE_DR7]                    = dr_interception,
2994         [SVM_EXIT_EXCP_BASE + DB_VECTOR]        = db_interception,
2995         [SVM_EXIT_EXCP_BASE + BP_VECTOR]        = bp_interception,
2996         [SVM_EXIT_EXCP_BASE + UD_VECTOR]        = ud_interception,
2997         [SVM_EXIT_EXCP_BASE + PF_VECTOR]        = pf_interception,
2998         [SVM_EXIT_EXCP_BASE + MC_VECTOR]        = mc_interception,
2999         [SVM_EXIT_EXCP_BASE + AC_VECTOR]        = ac_interception,
3000         [SVM_EXIT_EXCP_BASE + GP_VECTOR]        = gp_interception,
3001         [SVM_EXIT_INTR]                         = intr_interception,
3002         [SVM_EXIT_NMI]                          = nmi_interception,
3003         [SVM_EXIT_SMI]                          = nop_on_interception,
3004         [SVM_EXIT_INIT]                         = nop_on_interception,
3005         [SVM_EXIT_VINTR]                        = interrupt_window_interception,
3006         [SVM_EXIT_RDPMC]                        = rdpmc_interception,
3007         [SVM_EXIT_CPUID]                        = cpuid_interception,
3008         [SVM_EXIT_IRET]                         = iret_interception,
3009         [SVM_EXIT_INVD]                         = invd_interception,
3010         [SVM_EXIT_PAUSE]                        = pause_interception,
3011         [SVM_EXIT_HLT]                          = halt_interception,
3012         [SVM_EXIT_INVLPG]                       = invlpg_interception,
3013         [SVM_EXIT_INVLPGA]                      = invlpga_interception,
3014         [SVM_EXIT_IOIO]                         = io_interception,
3015         [SVM_EXIT_MSR]                          = msr_interception,
3016         [SVM_EXIT_TASK_SWITCH]                  = task_switch_interception,
3017         [SVM_EXIT_SHUTDOWN]                     = shutdown_interception,
3018         [SVM_EXIT_VMRUN]                        = vmrun_interception,
3019         [SVM_EXIT_VMMCALL]                      = vmmcall_interception,
3020         [SVM_EXIT_VMLOAD]                       = vmload_interception,
3021         [SVM_EXIT_VMSAVE]                       = vmsave_interception,
3022         [SVM_EXIT_STGI]                         = stgi_interception,
3023         [SVM_EXIT_CLGI]                         = clgi_interception,
3024         [SVM_EXIT_SKINIT]                       = skinit_interception,
3025         [SVM_EXIT_WBINVD]                       = wbinvd_interception,
3026         [SVM_EXIT_MONITOR]                      = monitor_interception,
3027         [SVM_EXIT_MWAIT]                        = mwait_interception,
3028         [SVM_EXIT_XSETBV]                       = xsetbv_interception,
3029         [SVM_EXIT_RDPRU]                        = rdpru_interception,
3030         [SVM_EXIT_EFER_WRITE_TRAP]              = efer_trap,
3031         [SVM_EXIT_CR0_WRITE_TRAP]               = cr_trap,
3032         [SVM_EXIT_CR4_WRITE_TRAP]               = cr_trap,
3033         [SVM_EXIT_INVPCID]                      = invpcid_interception,
3034         [SVM_EXIT_NPF]                          = npf_interception,
3035         [SVM_EXIT_RSM]                          = rsm_interception,
3036         [SVM_EXIT_AVIC_INCOMPLETE_IPI]          = avic_incomplete_ipi_interception,
3037         [SVM_EXIT_AVIC_UNACCELERATED_ACCESS]    = avic_unaccelerated_access_interception,
3038         [SVM_EXIT_VMGEXIT]                      = sev_handle_vmgexit,
3039 };
3040
3041 static void dump_vmcb(struct kvm_vcpu *vcpu)
3042 {
3043         struct vcpu_svm *svm = to_svm(vcpu);
3044         struct vmcb_control_area *control = &svm->vmcb->control;
3045         struct vmcb_save_area *save = &svm->vmcb->save;
3046
3047         if (!dump_invalid_vmcb) {
3048                 pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n");
3049                 return;
3050         }
3051
3052         pr_err("VMCB Control Area:\n");
3053         pr_err("%-20s%04x\n", "cr_read:", control->intercepts[INTERCEPT_CR] & 0xffff);
3054         pr_err("%-20s%04x\n", "cr_write:", control->intercepts[INTERCEPT_CR] >> 16);
3055         pr_err("%-20s%04x\n", "dr_read:", control->intercepts[INTERCEPT_DR] & 0xffff);
3056         pr_err("%-20s%04x\n", "dr_write:", control->intercepts[INTERCEPT_DR] >> 16);
3057         pr_err("%-20s%08x\n", "exceptions:", control->intercepts[INTERCEPT_EXCEPTION]);
3058         pr_err("%-20s%08x %08x\n", "intercepts:",
3059               control->intercepts[INTERCEPT_WORD3],
3060                control->intercepts[INTERCEPT_WORD4]);
3061         pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
3062         pr_err("%-20s%d\n", "pause filter threshold:",
3063                control->pause_filter_thresh);
3064         pr_err("%-20s%016llx\n", "iopm_base_pa:", control->iopm_base_pa);
3065         pr_err("%-20s%016llx\n", "msrpm_base_pa:", control->msrpm_base_pa);
3066         pr_err("%-20s%016llx\n", "tsc_offset:", control->tsc_offset);
3067         pr_err("%-20s%d\n", "asid:", control->asid);
3068         pr_err("%-20s%d\n", "tlb_ctl:", control->tlb_ctl);
3069         pr_err("%-20s%08x\n", "int_ctl:", control->int_ctl);
3070         pr_err("%-20s%08x\n", "int_vector:", control->int_vector);
3071         pr_err("%-20s%08x\n", "int_state:", control->int_state);
3072         pr_err("%-20s%08x\n", "exit_code:", control->exit_code);
3073         pr_err("%-20s%016llx\n", "exit_info1:", control->exit_info_1);
3074         pr_err("%-20s%016llx\n", "exit_info2:", control->exit_info_2);
3075         pr_err("%-20s%08x\n", "exit_int_info:", control->exit_int_info);
3076         pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
3077         pr_err("%-20s%lld\n", "nested_ctl:", control->nested_ctl);
3078         pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
3079         pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
3080         pr_err("%-20s%016llx\n", "ghcb:", control->ghcb_gpa);
3081         pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
3082         pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
3083         pr_err("%-20s%lld\n", "virt_ext:", control->virt_ext);
3084         pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
3085         pr_err("%-20s%016llx\n", "avic_backing_page:", control->avic_backing_page);
3086         pr_err("%-20s%016llx\n", "avic_logical_id:", control->avic_logical_id);
3087         pr_err("%-20s%016llx\n", "avic_physical_id:", control->avic_physical_id);
3088         pr_err("VMCB State Save Area:\n");
3089         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3090                "es:",
3091                save->es.selector, save->es.attrib,
3092                save->es.limit, save->es.base);
3093         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3094                "cs:",
3095                save->cs.selector, save->cs.attrib,
3096                save->cs.limit, save->cs.base);
3097         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3098                "ss:",
3099                save->ss.selector, save->ss.attrib,
3100                save->ss.limit, save->ss.base);
3101         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3102                "ds:",
3103                save->ds.selector, save->ds.attrib,
3104                save->ds.limit, save->ds.base);
3105         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3106                "fs:",
3107                save->fs.selector, save->fs.attrib,
3108                save->fs.limit, save->fs.base);
3109         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3110                "gs:",
3111                save->gs.selector, save->gs.attrib,
3112                save->gs.limit, save->gs.base);
3113         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3114                "gdtr:",
3115                save->gdtr.selector, save->gdtr.attrib,
3116                save->gdtr.limit, save->gdtr.base);
3117         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3118                "ldtr:",
3119                save->ldtr.selector, save->ldtr.attrib,
3120                save->ldtr.limit, save->ldtr.base);
3121         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3122                "idtr:",
3123                save->idtr.selector, save->idtr.attrib,
3124                save->idtr.limit, save->idtr.base);
3125         pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
3126                "tr:",
3127                save->tr.selector, save->tr.attrib,
3128                save->tr.limit, save->tr.base);
3129         pr_err("cpl:            %d                efer:         %016llx\n",
3130                 save->cpl, save->efer);
3131         pr_err("%-15s %016llx %-13s %016llx\n",
3132                "cr0:", save->cr0, "cr2:", save->cr2);
3133         pr_err("%-15s %016llx %-13s %016llx\n",
3134                "cr3:", save->cr3, "cr4:", save->cr4);
3135         pr_err("%-15s %016llx %-13s %016llx\n",
3136                "dr6:", save->dr6, "dr7:", save->dr7);
3137         pr_err("%-15s %016llx %-13s %016llx\n",
3138                "rip:", save->rip, "rflags:", save->rflags);
3139         pr_err("%-15s %016llx %-13s %016llx\n",
3140                "rsp:", save->rsp, "rax:", save->rax);
3141         pr_err("%-15s %016llx %-13s %016llx\n",
3142                "star:", save->star, "lstar:", save->lstar);
3143         pr_err("%-15s %016llx %-13s %016llx\n",
3144                "cstar:", save->cstar, "sfmask:", save->sfmask);
3145         pr_err("%-15s %016llx %-13s %016llx\n",
3146                "kernel_gs_base:", save->kernel_gs_base,
3147                "sysenter_cs:", save->sysenter_cs);
3148         pr_err("%-15s %016llx %-13s %016llx\n",
3149                "sysenter_esp:", save->sysenter_esp,
3150                "sysenter_eip:", save->sysenter_eip);
3151         pr_err("%-15s %016llx %-13s %016llx\n",
3152                "gpat:", save->g_pat, "dbgctl:", save->dbgctl);
3153         pr_err("%-15s %016llx %-13s %016llx\n",
3154                "br_from:", save->br_from, "br_to:", save->br_to);
3155         pr_err("%-15s %016llx %-13s %016llx\n",
3156                "excp_from:", save->last_excp_from,
3157                "excp_to:", save->last_excp_to);
3158 }
3159
3160 static int svm_handle_invalid_exit(struct kvm_vcpu *vcpu, u64 exit_code)
3161 {
3162         if (exit_code < ARRAY_SIZE(svm_exit_handlers) &&
3163             svm_exit_handlers[exit_code])
3164                 return 0;
3165
3166         vcpu_unimpl(vcpu, "svm: unexpected exit reason 0x%llx\n", exit_code);
3167         dump_vmcb(vcpu);
3168         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3169         vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON;
3170         vcpu->run->internal.ndata = 2;
3171         vcpu->run->internal.data[0] = exit_code;
3172         vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu;
3173
3174         return -EINVAL;
3175 }
3176
3177 int svm_invoke_exit_handler(struct vcpu_svm *svm, u64 exit_code)
3178 {
3179         if (svm_handle_invalid_exit(&svm->vcpu, exit_code))
3180                 return 0;
3181
3182 #ifdef CONFIG_RETPOLINE
3183         if (exit_code == SVM_EXIT_MSR)
3184                 return msr_interception(svm);
3185         else if (exit_code == SVM_EXIT_VINTR)
3186                 return interrupt_window_interception(svm);
3187         else if (exit_code == SVM_EXIT_INTR)
3188                 return intr_interception(svm);
3189         else if (exit_code == SVM_EXIT_HLT)
3190                 return halt_interception(svm);
3191         else if (exit_code == SVM_EXIT_NPF)
3192                 return npf_interception(svm);
3193 #endif
3194         return svm_exit_handlers[exit_code](svm);
3195 }
3196
3197 static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
3198                               u32 *intr_info, u32 *error_code)
3199 {
3200         struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
3201
3202         *info1 = control->exit_info_1;
3203         *info2 = control->exit_info_2;
3204         *intr_info = control->exit_int_info;
3205         if ((*intr_info & SVM_EXITINTINFO_VALID) &&
3206             (*intr_info & SVM_EXITINTINFO_VALID_ERR))
3207                 *error_code = control->exit_int_info_err;
3208         else
3209                 *error_code = 0;
3210 }
3211
3212 static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
3213 {
3214         struct vcpu_svm *svm = to_svm(vcpu);
3215         struct kvm_run *kvm_run = vcpu->run;
3216         u32 exit_code = svm->vmcb->control.exit_code;
3217
3218         trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
3219
3220         /* SEV-ES guests must use the CR write traps to track CR registers. */
3221         if (!sev_es_guest(vcpu->kvm)) {
3222                 if (!svm_is_intercept(svm, INTERCEPT_CR0_WRITE))
3223                         vcpu->arch.cr0 = svm->vmcb->save.cr0;
3224                 if (npt_enabled)
3225                         vcpu->arch.cr3 = svm->vmcb->save.cr3;
3226         }
3227
3228         if (is_guest_mode(vcpu)) {
3229                 int vmexit;
3230
3231                 trace_kvm_nested_vmexit(exit_code, vcpu, KVM_ISA_SVM);
3232
3233                 vmexit = nested_svm_exit_special(svm);
3234
3235                 if (vmexit == NESTED_EXIT_CONTINUE)
3236                         vmexit = nested_svm_exit_handled(svm);
3237
3238                 if (vmexit == NESTED_EXIT_DONE)
3239                         return 1;
3240         }
3241
3242         if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
3243                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3244                 kvm_run->fail_entry.hardware_entry_failure_reason
3245                         = svm->vmcb->control.exit_code;
3246                 kvm_run->fail_entry.cpu = vcpu->arch.last_vmentry_cpu;
3247                 dump_vmcb(vcpu);
3248                 return 0;
3249         }
3250
3251         if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
3252             exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
3253             exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
3254             exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
3255                 printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
3256                        "exit_code 0x%x\n",
3257                        __func__, svm->vmcb->control.exit_int_info,
3258                        exit_code);
3259
3260         if (exit_fastpath != EXIT_FASTPATH_NONE)
3261                 return 1;
3262
3263         return svm_invoke_exit_handler(svm, exit_code);
3264 }
3265
3266 static void reload_tss(struct kvm_vcpu *vcpu)
3267 {
3268         struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu);
3269
3270         sd->tss_desc->type = 9; /* available 32/64-bit TSS */
3271         load_TR_desc();
3272 }
3273
3274 static void pre_svm_run(struct vcpu_svm *svm)
3275 {
3276         struct svm_cpu_data *sd = per_cpu(svm_data, svm->vcpu.cpu);
3277
3278         if (sev_guest(svm->vcpu.kvm))
3279                 return pre_sev_run(svm, svm->vcpu.cpu);
3280
3281         /* FIXME: handle wraparound of asid_generation */
3282         if (svm->asid_generation != sd->asid_generation)
3283                 new_asid(svm, sd);
3284 }
3285
3286 static void svm_inject_nmi(struct kvm_vcpu *vcpu)
3287 {
3288         struct vcpu_svm *svm = to_svm(vcpu);
3289
3290         svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
3291         vcpu->arch.hflags |= HF_NMI_MASK;
3292         svm_set_intercept(svm, INTERCEPT_IRET);
3293         ++vcpu->stat.nmi_injections;
3294 }
3295
3296 static void svm_set_irq(struct kvm_vcpu *vcpu)
3297 {
3298         struct vcpu_svm *svm = to_svm(vcpu);
3299
3300         BUG_ON(!(gif_set(svm)));
3301
3302         trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
3303         ++vcpu->stat.irq_injections;
3304
3305         svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
3306                 SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
3307 }
3308
3309 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3310 {
3311         struct vcpu_svm *svm = to_svm(vcpu);
3312
3313         /*
3314          * SEV-ES guests must always keep the CR intercepts cleared. CR
3315          * tracking is done using the CR write traps.
3316          */
3317         if (sev_es_guest(vcpu->kvm))
3318                 return;
3319
3320         if (nested_svm_virtualize_tpr(vcpu))
3321                 return;
3322
3323         svm_clr_intercept(svm, INTERCEPT_CR8_WRITE);
3324
3325         if (irr == -1)
3326                 return;
3327
3328         if (tpr >= irr)
3329                 svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
3330 }
3331
3332 bool svm_nmi_blocked(struct kvm_vcpu *vcpu)
3333 {
3334         struct vcpu_svm *svm = to_svm(vcpu);
3335         struct vmcb *vmcb = svm->vmcb;
3336         bool ret;
3337
3338         if (!gif_set(svm))
3339                 return true;
3340
3341         if (is_guest_mode(vcpu) && nested_exit_on_nmi(svm))
3342                 return false;
3343
3344         ret = (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) ||
3345               (svm->vcpu.arch.hflags & HF_NMI_MASK);
3346
3347         return ret;
3348 }
3349
3350 static int svm_nmi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
3351 {
3352         struct vcpu_svm *svm = to_svm(vcpu);
3353         if (svm->nested.nested_run_pending)
3354                 return -EBUSY;
3355
3356         /* An NMI must not be injected into L2 if it's supposed to VM-Exit.  */
3357         if (for_injection && is_guest_mode(vcpu) && nested_exit_on_nmi(svm))
3358                 return -EBUSY;
3359
3360         return !svm_nmi_blocked(vcpu);
3361 }
3362
3363 static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
3364 {
3365         struct vcpu_svm *svm = to_svm(vcpu);
3366
3367         return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
3368 }
3369
3370 static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
3371 {
3372         struct vcpu_svm *svm = to_svm(vcpu);
3373
3374         if (masked) {
3375                 svm->vcpu.arch.hflags |= HF_NMI_MASK;
3376                 svm_set_intercept(svm, INTERCEPT_IRET);
3377         } else {
3378                 svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
3379                 svm_clr_intercept(svm, INTERCEPT_IRET);
3380         }
3381 }
3382
3383 bool svm_interrupt_blocked(struct kvm_vcpu *vcpu)
3384 {
3385         struct vcpu_svm *svm = to_svm(vcpu);
3386         struct vmcb *vmcb = svm->vmcb;
3387
3388         if (!gif_set(svm))
3389                 return true;
3390
3391         if (sev_es_guest(svm->vcpu.kvm)) {
3392                 /*
3393                  * SEV-ES guests to not expose RFLAGS. Use the VMCB interrupt mask
3394                  * bit to determine the state of the IF flag.
3395                  */
3396                 if (!(vmcb->control.int_state & SVM_GUEST_INTERRUPT_MASK))
3397                         return true;
3398         } else if (is_guest_mode(vcpu)) {
3399                 /* As long as interrupts are being delivered...  */
3400                 if ((svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK)
3401                     ? !(svm->nested.hsave->save.rflags & X86_EFLAGS_IF)
3402                     : !(kvm_get_rflags(vcpu) & X86_EFLAGS_IF))
3403                         return true;
3404
3405                 /* ... vmexits aren't blocked by the interrupt shadow  */
3406                 if (nested_exit_on_intr(svm))
3407                         return false;
3408         } else {
3409                 if (!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF))
3410                         return true;
3411         }
3412
3413         return (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK);
3414 }
3415
3416 static int svm_interrupt_allowed(struct kvm_vcpu *vcpu, bool for_injection)
3417 {
3418         struct vcpu_svm *svm = to_svm(vcpu);
3419         if (svm->nested.nested_run_pending)
3420                 return -EBUSY;
3421
3422         /*
3423          * An IRQ must not be injected into L2 if it's supposed to VM-Exit,
3424          * e.g. if the IRQ arrived asynchronously after checking nested events.
3425          */
3426         if (for_injection && is_guest_mode(vcpu) && nested_exit_on_intr(svm))
3427                 return -EBUSY;
3428
3429         return !svm_interrupt_blocked(vcpu);
3430 }
3431
3432 static void enable_irq_window(struct kvm_vcpu *vcpu)
3433 {
3434         struct vcpu_svm *svm = to_svm(vcpu);
3435
3436         /*
3437          * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
3438          * 1, because that's a separate STGI/VMRUN intercept.  The next time we
3439          * get that intercept, this function will be called again though and
3440          * we'll get the vintr intercept. However, if the vGIF feature is
3441          * enabled, the STGI interception will not occur. Enable the irq
3442          * window under the assumption that the hardware will set the GIF.
3443          */
3444         if (vgif_enabled(svm) || gif_set(svm)) {
3445                 /*
3446                  * IRQ window is not needed when AVIC is enabled,
3447                  * unless we have pending ExtINT since it cannot be injected
3448                  * via AVIC. In such case, we need to temporarily disable AVIC,
3449                  * and fallback to injecting IRQ via V_IRQ.
3450                  */
3451                 svm_toggle_avic_for_irq_window(vcpu, false);
3452                 svm_set_vintr(svm);
3453         }
3454 }
3455
3456 static void enable_nmi_window(struct kvm_vcpu *vcpu)
3457 {
3458         struct vcpu_svm *svm = to_svm(vcpu);
3459
3460         if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
3461             == HF_NMI_MASK)
3462                 return; /* IRET will cause a vm exit */
3463
3464         if (!gif_set(svm)) {
3465                 if (vgif_enabled(svm))
3466                         svm_set_intercept(svm, INTERCEPT_STGI);
3467                 return; /* STGI will cause a vm exit */
3468         }
3469
3470         /*
3471          * Something prevents NMI from been injected. Single step over possible
3472          * problem (IRET or exception injection or interrupt shadow)
3473          */
3474         svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
3475         svm->nmi_singlestep = true;
3476         svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
3477 }
3478
3479 static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
3480 {
3481         return 0;
3482 }
3483
3484 static int svm_set_identity_map_addr(struct kvm *kvm, u64 ident_addr)
3485 {
3486         return 0;
3487 }
3488
3489 void svm_flush_tlb(struct kvm_vcpu *vcpu)
3490 {
3491         struct vcpu_svm *svm = to_svm(vcpu);
3492
3493         /*
3494          * Flush only the current ASID even if the TLB flush was invoked via
3495          * kvm_flush_remote_tlbs().  Although flushing remote TLBs requires all
3496          * ASIDs to be flushed, KVM uses a single ASID for L1 and L2, and
3497          * unconditionally does a TLB flush on both nested VM-Enter and nested
3498          * VM-Exit (via kvm_mmu_reset_context()).
3499          */
3500         if (static_cpu_has(X86_FEATURE_FLUSHBYASID))
3501                 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
3502         else
3503                 svm->asid_generation--;
3504 }
3505
3506 static void svm_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t gva)
3507 {
3508         struct vcpu_svm *svm = to_svm(vcpu);
3509
3510         invlpga(gva, svm->vmcb->control.asid);
3511 }
3512
3513 static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
3514 {
3515 }
3516
3517 static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
3518 {
3519         struct vcpu_svm *svm = to_svm(vcpu);
3520
3521         if (nested_svm_virtualize_tpr(vcpu))
3522                 return;
3523
3524         if (!svm_is_intercept(svm, INTERCEPT_CR8_WRITE)) {
3525                 int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
3526                 kvm_set_cr8(vcpu, cr8);
3527         }
3528 }
3529
3530 static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
3531 {
3532         struct vcpu_svm *svm = to_svm(vcpu);
3533         u64 cr8;
3534
3535         if (nested_svm_virtualize_tpr(vcpu) ||
3536             kvm_vcpu_apicv_active(vcpu))
3537                 return;
3538
3539         cr8 = kvm_get_cr8(vcpu);
3540         svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
3541         svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
3542 }
3543
3544 static void svm_complete_interrupts(struct vcpu_svm *svm)
3545 {
3546         u8 vector;
3547         int type;
3548         u32 exitintinfo = svm->vmcb->control.exit_int_info;
3549         unsigned int3_injected = svm->int3_injected;
3550
3551         svm->int3_injected = 0;
3552
3553         /*
3554          * If we've made progress since setting HF_IRET_MASK, we've
3555          * executed an IRET and can allow NMI injection.
3556          */
3557         if ((svm->vcpu.arch.hflags & HF_IRET_MASK)
3558             && kvm_rip_read(&svm->vcpu) != svm->nmi_iret_rip) {
3559                 svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
3560                 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3561         }
3562
3563         svm->vcpu.arch.nmi_injected = false;
3564         kvm_clear_exception_queue(&svm->vcpu);
3565         kvm_clear_interrupt_queue(&svm->vcpu);
3566
3567         if (!(exitintinfo & SVM_EXITINTINFO_VALID))
3568                 return;
3569
3570         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3571
3572         vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
3573         type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
3574
3575         switch (type) {
3576         case SVM_EXITINTINFO_TYPE_NMI:
3577                 svm->vcpu.arch.nmi_injected = true;
3578                 break;
3579         case SVM_EXITINTINFO_TYPE_EXEPT:
3580                 /*
3581                  * Never re-inject a #VC exception.
3582                  */
3583                 if (vector == X86_TRAP_VC)
3584                         break;
3585
3586                 /*
3587                  * In case of software exceptions, do not reinject the vector,
3588                  * but re-execute the instruction instead. Rewind RIP first
3589                  * if we emulated INT3 before.
3590                  */
3591                 if (kvm_exception_is_soft(vector)) {
3592                         if (vector == BP_VECTOR && int3_injected &&
3593                             kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
3594                                 kvm_rip_write(&svm->vcpu,
3595                                               kvm_rip_read(&svm->vcpu) -
3596                                               int3_injected);
3597                         break;
3598                 }
3599                 if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
3600                         u32 err = svm->vmcb->control.exit_int_info_err;
3601                         kvm_requeue_exception_e(&svm->vcpu, vector, err);
3602
3603                 } else
3604                         kvm_requeue_exception(&svm->vcpu, vector);
3605                 break;
3606         case SVM_EXITINTINFO_TYPE_INTR:
3607                 kvm_queue_interrupt(&svm->vcpu, vector, false);
3608                 break;
3609         default:
3610                 break;
3611         }
3612 }
3613
3614 static void svm_cancel_injection(struct kvm_vcpu *vcpu)
3615 {
3616         struct vcpu_svm *svm = to_svm(vcpu);
3617         struct vmcb_control_area *control = &svm->vmcb->control;
3618
3619         control->exit_int_info = control->event_inj;
3620         control->exit_int_info_err = control->event_inj_err;
3621         control->event_inj = 0;
3622         svm_complete_interrupts(svm);
3623 }
3624
3625 static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
3626 {
3627         if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
3628             to_svm(vcpu)->vmcb->control.exit_info_1)
3629                 return handle_fastpath_set_msr_irqoff(vcpu);
3630
3631         return EXIT_FASTPATH_NONE;
3632 }
3633
3634 void __svm_vcpu_run(unsigned long vmcb_pa, unsigned long *regs);
3635
3636 static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu,
3637                                         struct vcpu_svm *svm)
3638 {
3639         /*
3640          * VMENTER enables interrupts (host state), but the kernel state is
3641          * interrupts disabled when this is invoked. Also tell RCU about
3642          * it. This is the same logic as for exit_to_user_mode().
3643          *
3644          * This ensures that e.g. latency analysis on the host observes
3645          * guest mode as interrupt enabled.
3646          *
3647          * guest_enter_irqoff() informs context tracking about the
3648          * transition to guest mode and if enabled adjusts RCU state
3649          * accordingly.
3650          */
3651         instrumentation_begin();
3652         trace_hardirqs_on_prepare();
3653         lockdep_hardirqs_on_prepare(CALLER_ADDR0);
3654         instrumentation_end();
3655
3656         guest_enter_irqoff();
3657         lockdep_hardirqs_on(CALLER_ADDR0);
3658
3659         __svm_vcpu_run(svm->vmcb_pa, (unsigned long *)&svm->vcpu.arch.regs);
3660
3661 #ifdef CONFIG_X86_64
3662         native_wrmsrl(MSR_GS_BASE, svm->host.gs_base);
3663 #else
3664         loadsegment(fs, svm->host.fs);
3665 #ifndef CONFIG_X86_32_LAZY_GS
3666         loadsegment(gs, svm->host.gs);
3667 #endif
3668 #endif
3669
3670         /*
3671          * VMEXIT disables interrupts (host state), but tracing and lockdep
3672          * have them in state 'on' as recorded before entering guest mode.
3673          * Same as enter_from_user_mode().
3674          *
3675          * guest_exit_irqoff() restores host context and reinstates RCU if
3676          * enabled and required.
3677          *
3678          * This needs to be done before the below as native_read_msr()
3679          * contains a tracepoint and x86_spec_ctrl_restore_host() calls
3680          * into world and some more.
3681          */
3682         lockdep_hardirqs_off(CALLER_ADDR0);
3683         guest_exit_irqoff();
3684
3685         instrumentation_begin();
3686         trace_hardirqs_off_finish();
3687         instrumentation_end();
3688 }
3689
3690 static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
3691 {
3692         struct vcpu_svm *svm = to_svm(vcpu);
3693
3694         svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
3695         svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
3696         svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
3697
3698         /*
3699          * Disable singlestep if we're injecting an interrupt/exception.
3700          * We don't want our modified rflags to be pushed on the stack where
3701          * we might not be able to easily reset them if we disabled NMI
3702          * singlestep later.
3703          */
3704         if (svm->nmi_singlestep && svm->vmcb->control.event_inj) {
3705                 /*
3706                  * Event injection happens before external interrupts cause a
3707                  * vmexit and interrupts are disabled here, so smp_send_reschedule
3708                  * is enough to force an immediate vmexit.
3709                  */
3710                 disable_nmi_singlestep(svm);
3711                 smp_send_reschedule(vcpu->cpu);
3712         }
3713
3714         pre_svm_run(svm);
3715
3716         sync_lapic_to_cr8(vcpu);
3717
3718         if (unlikely(svm->asid != svm->vmcb->control.asid)) {
3719                 svm->vmcb->control.asid = svm->asid;
3720                 vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
3721         }
3722         svm->vmcb->save.cr2 = vcpu->arch.cr2;
3723
3724         /*
3725          * Run with all-zero DR6 unless needed, so that we can get the exact cause
3726          * of a #DB.
3727          */
3728         if (unlikely(svm->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT))
3729                 svm_set_dr6(svm, vcpu->arch.dr6);
3730         else
3731                 svm_set_dr6(svm, DR6_FIXED_1 | DR6_RTM);
3732
3733         clgi();
3734         kvm_load_guest_xsave_state(vcpu);
3735
3736         kvm_wait_lapic_expire(vcpu);
3737
3738         /*
3739          * If this vCPU has touched SPEC_CTRL, restore the guest's value if
3740          * it's non-zero. Since vmentry is serialising on affected CPUs, there
3741          * is no need to worry about the conditional branch over the wrmsr
3742          * being speculatively taken.
3743          */
3744         x86_spec_ctrl_set_guest(svm->spec_ctrl, svm->virt_spec_ctrl);
3745
3746         svm_vcpu_enter_exit(vcpu, svm);
3747
3748         /*
3749          * We do not use IBRS in the kernel. If this vCPU has used the
3750          * SPEC_CTRL MSR it may have left it on; save the value and
3751          * turn it off. This is much more efficient than blindly adding
3752          * it to the atomic save/restore list. Especially as the former
3753          * (Saving guest MSRs on vmexit) doesn't even exist in KVM.
3754          *
3755          * For non-nested case:
3756          * If the L01 MSR bitmap does not intercept the MSR, then we need to
3757          * save it.
3758          *
3759          * For nested case:
3760          * If the L02 MSR bitmap does not intercept the MSR, then we need to
3761          * save it.
3762          */
3763         if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL)))
3764                 svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL);
3765
3766         reload_tss(vcpu);
3767
3768         x86_spec_ctrl_restore_host(svm->spec_ctrl, svm->virt_spec_ctrl);
3769
3770         vcpu->arch.cr2 = svm->vmcb->save.cr2;
3771         vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
3772         vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
3773         vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
3774
3775         if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
3776                 kvm_before_interrupt(&svm->vcpu);
3777
3778         kvm_load_host_xsave_state(vcpu);
3779         stgi();
3780
3781         /* Any pending NMI will happen here */
3782
3783         if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
3784                 kvm_after_interrupt(&svm->vcpu);
3785
3786         sync_cr8_to_lapic(vcpu);
3787
3788         svm->next_rip = 0;
3789         if (is_guest_mode(&svm->vcpu)) {
3790                 sync_nested_vmcb_control(svm);
3791                 svm->nested.nested_run_pending = 0;
3792         }
3793
3794         svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
3795         vmcb_mark_all_clean(svm->vmcb);
3796
3797         /* if exit due to PF check for async PF */
3798         if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
3799                 svm->vcpu.arch.apf.host_apf_flags =
3800                         kvm_read_and_reset_apf_flags();
3801
3802         if (npt_enabled) {
3803                 vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
3804                 vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
3805         }
3806
3807         /*
3808          * We need to handle MC intercepts here before the vcpu has a chance to
3809          * change the physical cpu
3810          */
3811         if (unlikely(svm->vmcb->control.exit_code ==
3812                      SVM_EXIT_EXCP_BASE + MC_VECTOR))
3813                 svm_handle_mce(svm);
3814
3815         svm_complete_interrupts(svm);
3816
3817         if (is_guest_mode(vcpu))
3818                 return EXIT_FASTPATH_NONE;
3819
3820         return svm_exit_handlers_fastpath(vcpu);
3821 }
3822
3823 static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long root,
3824                              int root_level)
3825 {
3826         struct vcpu_svm *svm = to_svm(vcpu);
3827         unsigned long cr3;
3828
3829         cr3 = __sme_set(root);
3830         if (npt_enabled) {
3831                 svm->vmcb->control.nested_cr3 = cr3;
3832                 vmcb_mark_dirty(svm->vmcb, VMCB_NPT);
3833
3834                 /* Loading L2's CR3 is handled by enter_svm_guest_mode.  */
3835                 if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
3836                         return;
3837                 cr3 = vcpu->arch.cr3;
3838         }
3839
3840         svm->vmcb->save.cr3 = cr3;
3841         vmcb_mark_dirty(svm->vmcb, VMCB_CR);
3842 }
3843
3844 static int is_disabled(void)
3845 {
3846         u64 vm_cr;
3847
3848         rdmsrl(MSR_VM_CR, vm_cr);
3849         if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
3850                 return 1;
3851
3852         return 0;
3853 }
3854
3855 static void
3856 svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
3857 {
3858         /*
3859          * Patch in the VMMCALL instruction:
3860          */
3861         hypercall[0] = 0x0f;
3862         hypercall[1] = 0x01;
3863         hypercall[2] = 0xd9;
3864 }
3865
3866 static int __init svm_check_processor_compat(void)
3867 {
3868         return 0;
3869 }
3870
3871 static bool svm_cpu_has_accelerated_tpr(void)
3872 {
3873         return false;
3874 }
3875
3876 static bool svm_has_emulated_msr(u32 index)
3877 {
3878         switch (index) {
3879         case MSR_IA32_MCG_EXT_CTL:
3880         case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
3881                 return false;
3882         default:
3883                 break;
3884         }
3885
3886         return true;
3887 }
3888
3889 static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
3890 {
3891         return 0;
3892 }
3893
3894 static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
3895 {
3896         struct vcpu_svm *svm = to_svm(vcpu);
3897         struct kvm_cpuid_entry2 *best;
3898
3899         vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
3900                                     boot_cpu_has(X86_FEATURE_XSAVE) &&
3901                                     boot_cpu_has(X86_FEATURE_XSAVES);
3902
3903         /* Update nrips enabled cache */
3904         svm->nrips_enabled = kvm_cpu_cap_has(X86_FEATURE_NRIPS) &&
3905                              guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
3906
3907         /* Check again if INVPCID interception if required */
3908         svm_check_invpcid(svm);
3909
3910         /* For sev guests, the memory encryption bit is not reserved in CR3.  */
3911         if (sev_guest(vcpu->kvm)) {
3912                 best = kvm_find_cpuid_entry(vcpu, 0x8000001F, 0);
3913                 if (best)
3914                         vcpu->arch.cr3_lm_rsvd_bits &= ~(1UL << (best->ebx & 0x3f));
3915         }
3916
3917         if (!kvm_vcpu_apicv_active(vcpu))
3918                 return;
3919
3920         /*
3921          * AVIC does not work with an x2APIC mode guest. If the X2APIC feature
3922          * is exposed to the guest, disable AVIC.
3923          */
3924         if (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC))
3925                 kvm_request_apicv_update(vcpu->kvm, false,
3926                                          APICV_INHIBIT_REASON_X2APIC);
3927
3928         /*
3929          * Currently, AVIC does not work with nested virtualization.
3930          * So, we disable AVIC when cpuid for SVM is set in the L1 guest.
3931          */
3932         if (nested && guest_cpuid_has(vcpu, X86_FEATURE_SVM))
3933                 kvm_request_apicv_update(vcpu->kvm, false,
3934                                          APICV_INHIBIT_REASON_NESTED);
3935 }
3936
3937 static bool svm_has_wbinvd_exit(void)
3938 {
3939         return true;
3940 }
3941
3942 #define PRE_EX(exit)  { .exit_code = (exit), \
3943                         .stage = X86_ICPT_PRE_EXCEPT, }
3944 #define POST_EX(exit) { .exit_code = (exit), \
3945                         .stage = X86_ICPT_POST_EXCEPT, }
3946 #define POST_MEM(exit) { .exit_code = (exit), \
3947                         .stage = X86_ICPT_POST_MEMACCESS, }
3948
3949 static const struct __x86_intercept {
3950         u32 exit_code;
3951         enum x86_intercept_stage stage;
3952 } x86_intercept_map[] = {
3953         [x86_intercept_cr_read]         = POST_EX(SVM_EXIT_READ_CR0),
3954         [x86_intercept_cr_write]        = POST_EX(SVM_EXIT_WRITE_CR0),
3955         [x86_intercept_clts]            = POST_EX(SVM_EXIT_WRITE_CR0),
3956         [x86_intercept_lmsw]            = POST_EX(SVM_EXIT_WRITE_CR0),
3957         [x86_intercept_smsw]            = POST_EX(SVM_EXIT_READ_CR0),
3958         [x86_intercept_dr_read]         = POST_EX(SVM_EXIT_READ_DR0),
3959         [x86_intercept_dr_write]        = POST_EX(SVM_EXIT_WRITE_DR0),
3960         [x86_intercept_sldt]            = POST_EX(SVM_EXIT_LDTR_READ),
3961         [x86_intercept_str]             = POST_EX(SVM_EXIT_TR_READ),
3962         [x86_intercept_lldt]            = POST_EX(SVM_EXIT_LDTR_WRITE),
3963         [x86_intercept_ltr]             = POST_EX(SVM_EXIT_TR_WRITE),
3964         [x86_intercept_sgdt]            = POST_EX(SVM_EXIT_GDTR_READ),
3965         [x86_intercept_sidt]            = POST_EX(SVM_EXIT_IDTR_READ),
3966         [x86_intercept_lgdt]            = POST_EX(SVM_EXIT_GDTR_WRITE),
3967         [x86_intercept_lidt]            = POST_EX(SVM_EXIT_IDTR_WRITE),
3968         [x86_intercept_vmrun]           = POST_EX(SVM_EXIT_VMRUN),
3969         [x86_intercept_vmmcall]         = POST_EX(SVM_EXIT_VMMCALL),
3970         [x86_intercept_vmload]          = POST_EX(SVM_EXIT_VMLOAD),
3971         [x86_intercept_vmsave]          = POST_EX(SVM_EXIT_VMSAVE),
3972         [x86_intercept_stgi]            = POST_EX(SVM_EXIT_STGI),
3973         [x86_intercept_clgi]            = POST_EX(SVM_EXIT_CLGI),
3974         [x86_intercept_skinit]          = POST_EX(SVM_EXIT_SKINIT),
3975         [x86_intercept_invlpga]         = POST_EX(SVM_EXIT_INVLPGA),
3976         [x86_intercept_rdtscp]          = POST_EX(SVM_EXIT_RDTSCP),
3977         [x86_intercept_monitor]         = POST_MEM(SVM_EXIT_MONITOR),
3978         [x86_intercept_mwait]           = POST_EX(SVM_EXIT_MWAIT),
3979         [x86_intercept_invlpg]          = POST_EX(SVM_EXIT_INVLPG),
3980         [x86_intercept_invd]            = POST_EX(SVM_EXIT_INVD),
3981         [x86_intercept_wbinvd]          = POST_EX(SVM_EXIT_WBINVD),
3982         [x86_intercept_wrmsr]           = POST_EX(SVM_EXIT_MSR),
3983         [x86_intercept_rdtsc]           = POST_EX(SVM_EXIT_RDTSC),
3984         [x86_intercept_rdmsr]           = POST_EX(SVM_EXIT_MSR),
3985         [x86_intercept_rdpmc]           = POST_EX(SVM_EXIT_RDPMC),
3986         [x86_intercept_cpuid]           = PRE_EX(SVM_EXIT_CPUID),
3987         [x86_intercept_rsm]             = PRE_EX(SVM_EXIT_RSM),
3988         [x86_intercept_pause]           = PRE_EX(SVM_EXIT_PAUSE),
3989         [x86_intercept_pushf]           = PRE_EX(SVM_EXIT_PUSHF),
3990         [x86_intercept_popf]            = PRE_EX(SVM_EXIT_POPF),
3991         [x86_intercept_intn]            = PRE_EX(SVM_EXIT_SWINT),
3992         [x86_intercept_iret]            = PRE_EX(SVM_EXIT_IRET),
3993         [x86_intercept_icebp]           = PRE_EX(SVM_EXIT_ICEBP),
3994         [x86_intercept_hlt]             = POST_EX(SVM_EXIT_HLT),
3995         [x86_intercept_in]              = POST_EX(SVM_EXIT_IOIO),
3996         [x86_intercept_ins]             = POST_EX(SVM_EXIT_IOIO),
3997         [x86_intercept_out]             = POST_EX(SVM_EXIT_IOIO),
3998         [x86_intercept_outs]            = POST_EX(SVM_EXIT_IOIO),
3999         [x86_intercept_xsetbv]          = PRE_EX(SVM_EXIT_XSETBV),
4000 };
4001
4002 #undef PRE_EX
4003 #undef POST_EX
4004 #undef POST_MEM
4005
4006 static int svm_check_intercept(struct kvm_vcpu *vcpu,
4007                                struct x86_instruction_info *info,
4008                                enum x86_intercept_stage stage,
4009                                struct x86_exception *exception)
4010 {
4011         struct vcpu_svm *svm = to_svm(vcpu);
4012         int vmexit, ret = X86EMUL_CONTINUE;
4013         struct __x86_intercept icpt_info;
4014         struct vmcb *vmcb = svm->vmcb;
4015
4016         if (info->intercept >= ARRAY_SIZE(x86_intercept_map))
4017                 goto out;
4018
4019         icpt_info = x86_intercept_map[info->intercept];
4020
4021         if (stage != icpt_info.stage)
4022                 goto out;
4023
4024         switch (icpt_info.exit_code) {
4025         case SVM_EXIT_READ_CR0:
4026                 if (info->intercept == x86_intercept_cr_read)
4027                         icpt_info.exit_code += info->modrm_reg;
4028                 break;
4029         case SVM_EXIT_WRITE_CR0: {
4030                 unsigned long cr0, val;
4031
4032                 if (info->intercept == x86_intercept_cr_write)
4033                         icpt_info.exit_code += info->modrm_reg;
4034
4035                 if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
4036                     info->intercept == x86_intercept_clts)
4037                         break;
4038
4039                 if (!(vmcb_is_intercept(&svm->nested.ctl,
4040                                         INTERCEPT_SELECTIVE_CR0)))
4041                         break;
4042
4043                 cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
4044                 val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;
4045
4046                 if (info->intercept == x86_intercept_lmsw) {
4047                         cr0 &= 0xfUL;
4048                         val &= 0xfUL;
4049                         /* lmsw can't clear PE - catch this here */
4050                         if (cr0 & X86_CR0_PE)
4051                                 val |= X86_CR0_PE;
4052                 }
4053
4054                 if (cr0 ^ val)
4055                         icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
4056
4057                 break;
4058         }
4059         case SVM_EXIT_READ_DR0:
4060         case SVM_EXIT_WRITE_DR0:
4061                 icpt_info.exit_code += info->modrm_reg;
4062                 break;
4063         case SVM_EXIT_MSR:
4064                 if (info->intercept == x86_intercept_wrmsr)
4065                         vmcb->control.exit_info_1 = 1;
4066                 else
4067                         vmcb->control.exit_info_1 = 0;
4068                 break;
4069         case SVM_EXIT_PAUSE:
4070                 /*
4071                  * We get this for NOP only, but pause
4072                  * is rep not, check this here
4073                  */
4074                 if (info->rep_prefix != REPE_PREFIX)
4075                         goto out;
4076                 break;
4077         case SVM_EXIT_IOIO: {
4078                 u64 exit_info;
4079                 u32 bytes;
4080
4081                 if (info->intercept == x86_intercept_in ||
4082                     info->intercept == x86_intercept_ins) {
4083                         exit_info = ((info->src_val & 0xffff) << 16) |
4084                                 SVM_IOIO_TYPE_MASK;
4085                         bytes = info->dst_bytes;
4086                 } else {
4087                         exit_info = (info->dst_val & 0xffff) << 16;
4088                         bytes = info->src_bytes;
4089                 }
4090
4091                 if (info->intercept == x86_intercept_outs ||
4092                     info->intercept == x86_intercept_ins)
4093                         exit_info |= SVM_IOIO_STR_MASK;
4094
4095                 if (info->rep_prefix)
4096                         exit_info |= SVM_IOIO_REP_MASK;
4097
4098                 bytes = min(bytes, 4u);
4099
4100                 exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
4101
4102                 exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
4103
4104                 vmcb->control.exit_info_1 = exit_info;
4105                 vmcb->control.exit_info_2 = info->next_rip;
4106
4107                 break;
4108         }
4109         default:
4110                 break;
4111         }
4112
4113         /* TODO: Advertise NRIPS to guest hypervisor unconditionally */
4114         if (static_cpu_has(X86_FEATURE_NRIPS))
4115                 vmcb->control.next_rip  = info->next_rip;
4116         vmcb->control.exit_code = icpt_info.exit_code;
4117         vmexit = nested_svm_exit_handled(svm);
4118
4119         ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
4120                                            : X86EMUL_CONTINUE;
4121
4122 out:
4123         return ret;
4124 }
4125
4126 static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu)
4127 {
4128 }
4129
4130 static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
4131 {
4132         if (!kvm_pause_in_guest(vcpu->kvm))
4133                 shrink_ple_window(vcpu);
4134 }
4135
4136 static void svm_setup_mce(struct kvm_vcpu *vcpu)
4137 {
4138         /* [63:9] are reserved. */
4139         vcpu->arch.mcg_cap &= 0x1ff;
4140 }
4141
4142 bool svm_smi_blocked(struct kvm_vcpu *vcpu)
4143 {
4144         struct vcpu_svm *svm = to_svm(vcpu);
4145
4146         /* Per APM Vol.2 15.22.2 "Response to SMI" */
4147         if (!gif_set(svm))
4148                 return true;
4149
4150         return is_smm(vcpu);
4151 }
4152
4153 static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
4154 {
4155         struct vcpu_svm *svm = to_svm(vcpu);
4156         if (svm->nested.nested_run_pending)
4157                 return -EBUSY;
4158
4159         /* An SMI must not be injected into L2 if it's supposed to VM-Exit.  */
4160         if (for_injection && is_guest_mode(vcpu) && nested_exit_on_smi(svm))
4161                 return -EBUSY;
4162
4163         return !svm_smi_blocked(vcpu);
4164 }
4165
4166 static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
4167 {
4168         struct vcpu_svm *svm = to_svm(vcpu);
4169         int ret;
4170
4171         if (is_guest_mode(vcpu)) {
4172                 /* FED8h - SVM Guest */
4173                 put_smstate(u64, smstate, 0x7ed8, 1);
4174                 /* FEE0h - SVM Guest VMCB Physical Address */
4175                 put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb12_gpa);
4176
4177                 svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
4178                 svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
4179                 svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
4180
4181                 ret = nested_svm_vmexit(svm);
4182                 if (ret)
4183                         return ret;
4184         }
4185         return 0;
4186 }
4187
4188 static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
4189 {
4190         struct vcpu_svm *svm = to_svm(vcpu);
4191         struct kvm_host_map map;
4192         int ret = 0;
4193
4194         if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) {
4195                 u64 saved_efer = GET_SMSTATE(u64, smstate, 0x7ed0);
4196                 u64 guest = GET_SMSTATE(u64, smstate, 0x7ed8);
4197                 u64 vmcb12_gpa = GET_SMSTATE(u64, smstate, 0x7ee0);
4198
4199                 if (guest) {
4200                         if (!guest_cpuid_has(vcpu, X86_FEATURE_SVM))
4201                                 return 1;
4202
4203                         if (!(saved_efer & EFER_SVME))
4204                                 return 1;
4205
4206                         if (kvm_vcpu_map(&svm->vcpu,
4207                                          gpa_to_gfn(vmcb12_gpa), &map) == -EINVAL)
4208                                 return 1;
4209
4210                         if (svm_allocate_nested(svm))
4211                                 return 1;
4212
4213                         ret = enter_svm_guest_mode(svm, vmcb12_gpa, map.hva);
4214                         kvm_vcpu_unmap(&svm->vcpu, &map, true);
4215                 }
4216         }
4217
4218         return ret;
4219 }
4220
4221 static void enable_smi_window(struct kvm_vcpu *vcpu)
4222 {
4223         struct vcpu_svm *svm = to_svm(vcpu);
4224
4225         if (!gif_set(svm)) {
4226                 if (vgif_enabled(svm))
4227                         svm_set_intercept(svm, INTERCEPT_STGI);
4228                 /* STGI will cause a vm exit */
4229         } else {
4230                 /* We must be in SMM; RSM will cause a vmexit anyway.  */
4231         }
4232 }
4233
4234 static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, void *insn, int insn_len)
4235 {
4236         bool smep, smap, is_user;
4237         unsigned long cr4;
4238
4239         /*
4240          * When the guest is an SEV-ES guest, emulation is not possible.
4241          */
4242         if (sev_es_guest(vcpu->kvm))
4243                 return false;
4244
4245         /*
4246          * Detect and workaround Errata 1096 Fam_17h_00_0Fh.
4247          *
4248          * Errata:
4249          * When CPU raise #NPF on guest data access and vCPU CR4.SMAP=1, it is
4250          * possible that CPU microcode implementing DecodeAssist will fail
4251          * to read bytes of instruction which caused #NPF. In this case,
4252          * GuestIntrBytes field of the VMCB on a VMEXIT will incorrectly
4253          * return 0 instead of the correct guest instruction bytes.
4254          *
4255          * This happens because CPU microcode reading instruction bytes
4256          * uses a special opcode which attempts to read data using CPL=0
4257          * priviledges. The microcode reads CS:RIP and if it hits a SMAP
4258          * fault, it gives up and returns no instruction bytes.
4259          *
4260          * Detection:
4261          * We reach here in case CPU supports DecodeAssist, raised #NPF and
4262          * returned 0 in GuestIntrBytes field of the VMCB.
4263          * First, errata can only be triggered in case vCPU CR4.SMAP=1.
4264          * Second, if vCPU CR4.SMEP=1, errata could only be triggered
4265          * in case vCPU CPL==3 (Because otherwise guest would have triggered
4266          * a SMEP fault instead of #NPF).
4267          * Otherwise, vCPU CR4.SMEP=0, errata could be triggered by any vCPU CPL.
4268          * As most guests enable SMAP if they have also enabled SMEP, use above
4269          * logic in order to attempt minimize false-positive of detecting errata
4270          * while still preserving all cases semantic correctness.
4271          *
4272          * Workaround:
4273          * To determine what instruction the guest was executing, the hypervisor
4274          * will have to decode the instruction at the instruction pointer.
4275          *
4276          * In non SEV guest, hypervisor will be able to read the guest
4277          * memory to decode the instruction pointer when insn_len is zero
4278          * so we return true to indicate that decoding is possible.
4279          *
4280          * But in the SEV guest, the guest memory is encrypted with the
4281          * guest specific key and hypervisor will not be able to decode the
4282          * instruction pointer so we will not able to workaround it. Lets
4283          * print the error and request to kill the guest.
4284          */
4285         if (likely(!insn || insn_len))
4286                 return true;
4287
4288         /*
4289          * If RIP is invalid, go ahead with emulation which will cause an
4290          * internal error exit.
4291          */
4292         if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
4293                 return true;
4294
4295         cr4 = kvm_read_cr4(vcpu);
4296         smep = cr4 & X86_CR4_SMEP;
4297         smap = cr4 & X86_CR4_SMAP;
4298         is_user = svm_get_cpl(vcpu) == 3;
4299         if (smap && (!smep || is_user)) {
4300                 if (!sev_guest(vcpu->kvm))
4301                         return true;
4302
4303                 pr_err_ratelimited("KVM: SEV Guest triggered AMD Erratum 1096\n");
4304                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4305         }
4306
4307         return false;
4308 }
4309
4310 static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
4311 {
4312         struct vcpu_svm *svm = to_svm(vcpu);
4313
4314         /*
4315          * TODO: Last condition latch INIT signals on vCPU when
4316          * vCPU is in guest-mode and vmcb12 defines intercept on INIT.
4317          * To properly emulate the INIT intercept,
4318          * svm_check_nested_events() should call nested_svm_vmexit()
4319          * if an INIT signal is pending.
4320          */
4321         return !gif_set(svm) ||
4322                    (vmcb_is_intercept(&svm->vmcb->control, INTERCEPT_INIT));
4323 }
4324
4325 static void svm_vm_destroy(struct kvm *kvm)
4326 {
4327         avic_vm_destroy(kvm);
4328         sev_vm_destroy(kvm);
4329 }
4330
4331 static int svm_vm_init(struct kvm *kvm)
4332 {
4333         if (!pause_filter_count || !pause_filter_thresh)
4334                 kvm->arch.pause_in_guest = true;
4335
4336         if (avic) {
4337                 int ret = avic_vm_init(kvm);
4338                 if (ret)
4339                         return ret;
4340         }
4341
4342         kvm_apicv_init(kvm, avic);
4343         return 0;
4344 }
4345
4346 static struct kvm_x86_ops svm_x86_ops __initdata = {
4347         .hardware_unsetup = svm_hardware_teardown,
4348         .hardware_enable = svm_hardware_enable,
4349         .hardware_disable = svm_hardware_disable,
4350         .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
4351         .has_emulated_msr = svm_has_emulated_msr,
4352
4353         .vcpu_create = svm_create_vcpu,
4354         .vcpu_free = svm_free_vcpu,
4355         .vcpu_reset = svm_vcpu_reset,
4356
4357         .vm_size = sizeof(struct kvm_svm),
4358         .vm_init = svm_vm_init,
4359         .vm_destroy = svm_vm_destroy,
4360
4361         .prepare_guest_switch = svm_prepare_guest_switch,
4362         .vcpu_load = svm_vcpu_load,
4363         .vcpu_put = svm_vcpu_put,
4364         .vcpu_blocking = svm_vcpu_blocking,
4365         .vcpu_unblocking = svm_vcpu_unblocking,
4366
4367         .update_exception_bitmap = update_exception_bitmap,
4368         .get_msr_feature = svm_get_msr_feature,
4369         .get_msr = svm_get_msr,
4370         .set_msr = svm_set_msr,
4371         .get_segment_base = svm_get_segment_base,
4372         .get_segment = svm_get_segment,
4373         .set_segment = svm_set_segment,
4374         .get_cpl = svm_get_cpl,
4375         .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
4376         .set_cr0 = svm_set_cr0,
4377         .is_valid_cr4 = svm_is_valid_cr4,
4378         .set_cr4 = svm_set_cr4,
4379         .set_efer = svm_set_efer,
4380         .get_idt = svm_get_idt,
4381         .set_idt = svm_set_idt,
4382         .get_gdt = svm_get_gdt,
4383         .set_gdt = svm_set_gdt,
4384         .set_dr7 = svm_set_dr7,
4385         .sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
4386         .cache_reg = svm_cache_reg,
4387         .get_rflags = svm_get_rflags,
4388         .set_rflags = svm_set_rflags,
4389
4390         .tlb_flush_all = svm_flush_tlb,
4391         .tlb_flush_current = svm_flush_tlb,
4392         .tlb_flush_gva = svm_flush_tlb_gva,
4393         .tlb_flush_guest = svm_flush_tlb,
4394
4395         .run = svm_vcpu_run,
4396         .handle_exit = handle_exit,
4397         .skip_emulated_instruction = skip_emulated_instruction,
4398         .update_emulated_instruction = NULL,
4399         .set_interrupt_shadow = svm_set_interrupt_shadow,
4400         .get_interrupt_shadow = svm_get_interrupt_shadow,
4401         .patch_hypercall = svm_patch_hypercall,
4402         .set_irq = svm_set_irq,
4403         .set_nmi = svm_inject_nmi,
4404         .queue_exception = svm_queue_exception,
4405         .cancel_injection = svm_cancel_injection,
4406         .interrupt_allowed = svm_interrupt_allowed,
4407         .nmi_allowed = svm_nmi_allowed,
4408         .get_nmi_mask = svm_get_nmi_mask,
4409         .set_nmi_mask = svm_set_nmi_mask,
4410         .enable_nmi_window = enable_nmi_window,
4411         .enable_irq_window = enable_irq_window,
4412         .update_cr8_intercept = update_cr8_intercept,
4413         .set_virtual_apic_mode = svm_set_virtual_apic_mode,
4414         .refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
4415         .check_apicv_inhibit_reasons = svm_check_apicv_inhibit_reasons,
4416         .pre_update_apicv_exec_ctrl = svm_pre_update_apicv_exec_ctrl,
4417         .load_eoi_exitmap = svm_load_eoi_exitmap,
4418         .hwapic_irr_update = svm_hwapic_irr_update,
4419         .hwapic_isr_update = svm_hwapic_isr_update,
4420         .sync_pir_to_irr = kvm_lapic_find_highest_irr,
4421         .apicv_post_state_restore = avic_post_state_restore,
4422
4423         .set_tss_addr = svm_set_tss_addr,
4424         .set_identity_map_addr = svm_set_identity_map_addr,
4425         .get_mt_mask = svm_get_mt_mask,
4426
4427         .get_exit_info = svm_get_exit_info,
4428
4429         .vcpu_after_set_cpuid = svm_vcpu_after_set_cpuid,
4430
4431         .has_wbinvd_exit = svm_has_wbinvd_exit,
4432
4433         .write_l1_tsc_offset = svm_write_l1_tsc_offset,
4434
4435         .load_mmu_pgd = svm_load_mmu_pgd,
4436
4437         .check_intercept = svm_check_intercept,
4438         .handle_exit_irqoff = svm_handle_exit_irqoff,
4439
4440         .request_immediate_exit = __kvm_request_immediate_exit,
4441
4442         .sched_in = svm_sched_in,
4443
4444         .pmu_ops = &amd_pmu_ops,
4445         .nested_ops = &svm_nested_ops,
4446
4447         .deliver_posted_interrupt = svm_deliver_avic_intr,
4448         .dy_apicv_has_pending_interrupt = svm_dy_apicv_has_pending_interrupt,
4449         .update_pi_irte = svm_update_pi_irte,
4450         .setup_mce = svm_setup_mce,
4451
4452         .smi_allowed = svm_smi_allowed,
4453         .pre_enter_smm = svm_pre_enter_smm,
4454         .pre_leave_smm = svm_pre_leave_smm,
4455         .enable_smi_window = enable_smi_window,
4456
4457         .mem_enc_op = svm_mem_enc_op,
4458         .mem_enc_reg_region = svm_register_enc_region,
4459         .mem_enc_unreg_region = svm_unregister_enc_region,
4460
4461         .can_emulate_instruction = svm_can_emulate_instruction,
4462
4463         .apic_init_signal_blocked = svm_apic_init_signal_blocked,
4464
4465         .msr_filter_changed = svm_msr_filter_changed,
4466         .complete_emulated_msr = svm_complete_emulated_msr,
4467 };
4468
4469 static struct kvm_x86_init_ops svm_init_ops __initdata = {
4470         .cpu_has_kvm_support = has_svm,
4471         .disabled_by_bios = is_disabled,
4472         .hardware_setup = svm_hardware_setup,
4473         .check_processor_compatibility = svm_check_processor_compat,
4474
4475         .runtime_ops = &svm_x86_ops,
4476 };
4477
4478 static int __init svm_init(void)
4479 {
4480         __unused_size_checks();
4481
4482         return kvm_init(&svm_init_ops, sizeof(struct vcpu_svm),
4483                         __alignof__(struct vcpu_svm), THIS_MODULE);
4484 }
4485
4486 static void __exit svm_exit(void)
4487 {
4488         kvm_exit();
4489 }
4490
4491 module_init(svm_init)
4492 module_exit(svm_exit)