arch/x86/kvm/svm.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * AMD SVM support
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
   8  *
   9  * Authors:
  10  *   Yaniv Kamay  <yaniv@qumranet.com>
  11  *   Avi Kivity   <avi@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17 #include <linux/kvm_host.h>
  18
  19 #include "irq.h"
  20 #include "mmu.h"
  21 #include "kvm_cache_regs.h"
  22 #include "x86.h"
  23
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/highmem.h>
  28 #include <linux/sched.h>
  29 #include <linux/ftrace_event.h>
  30 #include <linux/slab.h>
  31
  32 #include <asm/tlbflush.h>
  33 #include <asm/desc.h>
  34 #include <asm/kvm_para.h>
  35
  36 #include <asm/virtext.h>
  37 #include "trace.h"
  38
  39 #define __ex(x) __kvm_handle_fault_on_reboot(x)
  40
  41 MODULE_AUTHOR("Qumranet");
  42 MODULE_LICENSE("GPL");
  43
  44 #define IOPM_ALLOC_ORDER 2
  45 #define MSRPM_ALLOC_ORDER 1
  46
  47 #define SEG_TYPE_LDT 2
  48 #define SEG_TYPE_BUSY_TSS16 3
  49
  50 #define SVM_FEATURE_NPT            (1 <<  0)
  51 #define SVM_FEATURE_LBRV           (1 <<  1)
  52 #define SVM_FEATURE_SVML           (1 <<  2)
  53 #define SVM_FEATURE_NRIP           (1 <<  3)
  54 #define SVM_FEATURE_TSC_RATE       (1 <<  4)
  55 #define SVM_FEATURE_VMCB_CLEAN     (1 <<  5)
  56 #define SVM_FEATURE_FLUSH_ASID     (1 <<  6)
  57 #define SVM_FEATURE_DECODE_ASSIST  (1 <<  7)
  58 #define SVM_FEATURE_PAUSE_FILTER   (1 << 10)
  59
  60 #define NESTED_EXIT_HOST        0       /* Exit handled on host level */
  61 #define NESTED_EXIT_DONE        1       /* Exit caused nested vmexit  */
  62 #define NESTED_EXIT_CONTINUE    2       /* Further checks needed      */
  63
  64 #define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
  65
  66 static bool erratum_383_found __read_mostly;
  67
  68 static const u32 host_save_user_msrs[] = {
  69 #ifdef CONFIG_X86_64
  70         MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
  71         MSR_FS_BASE,
  72 #endif
  73         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
  74 };
  75
  76 #define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
  77
  78 struct kvm_vcpu;
  79
  80 struct nested_state {
  81         struct vmcb *hsave;
  82         u64 hsave_msr;
  83         u64 vm_cr_msr;
  84         u64 vmcb;
  85
  86         /* These are the merged vectors */
  87         u32 *msrpm;
  88
  89         /* gpa pointers to the real vectors */
  90         u64 vmcb_msrpm;
  91         u64 vmcb_iopm;
  92
  93         /* A VMEXIT is required but not yet emulated */
  94         bool exit_required;
  95
  96         /*
  97          * If we vmexit during an instruction emulation we need this to restore
  98          * the l1 guest rip after the emulation
  99          */
 100         unsigned long vmexit_rip;
 101         unsigned long vmexit_rsp;
 102         unsigned long vmexit_rax;
 103
 104         /* cache for intercepts of the guest */
 105         u32 intercept_cr;
 106         u32 intercept_dr;
 107         u32 intercept_exceptions;
 108         u64 intercept;
 109
 110         /* Nested Paging related state */
 111         u64 nested_cr3;
 112 };
 113
 114 #define MSRPM_OFFSETS   16
 115 static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
 116
 117 struct vcpu_svm {
 118         struct kvm_vcpu vcpu;
 119         struct vmcb *vmcb;
 120         unsigned long vmcb_pa;
 121         struct svm_cpu_data *svm_data;
 122         uint64_t asid_generation;
 123         uint64_t sysenter_esp;
 124         uint64_t sysenter_eip;
 125
 126         u64 next_rip;
 127
 128         u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
 129         struct {
 130                 u16 fs;
 131                 u16 gs;
 132                 u16 ldt;
 133                 u64 gs_base;
 134         } host;
 135
 136         u32 *msrpm;
 137
 138         struct nested_state nested;
 139
 140         bool nmi_singlestep;
 141
 142         unsigned int3_injected;
 143         unsigned long int3_rip;
 144         u32 apf_reason;
 145 };
 146
 147 #define MSR_INVALID                     0xffffffffU
 148
 149 static struct svm_direct_access_msrs {
 150         u32 index;   /* Index of the MSR */
 151         bool always; /* True if intercept is always on */
 152 } direct_access_msrs[] = {
 153         { .index = MSR_STAR,                            .always = true  },
 154         { .index = MSR_IA32_SYSENTER_CS,                .always = true  },
 155 #ifdef CONFIG_X86_64
 156         { .index = MSR_GS_BASE,                         .always = true  },
 157         { .index = MSR_FS_BASE,                         .always = true  },
 158         { .index = MSR_KERNEL_GS_BASE,                  .always = true  },
 159         { .index = MSR_LSTAR,                           .always = true  },
 160         { .index = MSR_CSTAR,                           .always = true  },
 161         { .index = MSR_SYSCALL_MASK,                    .always = true  },
 162 #endif
 163         { .index = MSR_IA32_LASTBRANCHFROMIP,           .always = false },
 164         { .index = MSR_IA32_LASTBRANCHTOIP,             .always = false },
 165         { .index = MSR_IA32_LASTINTFROMIP,              .always = false },
 166         { .index = MSR_IA32_LASTINTTOIP,                .always = false },
 167         { .index = MSR_INVALID,                         .always = false },
 168 };
 169
 170 /* enable NPT for AMD64 and X86 with PAE */
 171 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 172 static bool npt_enabled = true;
 173 #else
 174 static bool npt_enabled;
 175 #endif
 176 static int npt = 1;
 177
 178 module_param(npt, int, S_IRUGO);
 179
 180 static int nested = 1;
 181 module_param(nested, int, S_IRUGO);
 182
 183 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
 184 static void svm_complete_interrupts(struct vcpu_svm *svm);
 185
 186 static int nested_svm_exit_handled(struct vcpu_svm *svm);
 187 static int nested_svm_intercept(struct vcpu_svm *svm);
 188 static int nested_svm_vmexit(struct vcpu_svm *svm);
 189 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
 190                                       bool has_error_code, u32 error_code);
 191
 192 enum {
 193         VMCB_INTERCEPTS, /* Intercept vectors, TSC offset,
 194                             pause filter count */
 195         VMCB_PERM_MAP,   /* IOPM Base and MSRPM Base */
 196         VMCB_ASID,       /* ASID */
 197         VMCB_INTR,       /* int_ctl, int_vector */
 198         VMCB_NPT,        /* npt_en, nCR3, gPAT */
 199         VMCB_CR,         /* CR0, CR3, CR4, EFER */
 200         VMCB_DR,         /* DR6, DR7 */
 201         VMCB_DT,         /* GDT, IDT */
 202         VMCB_SEG,        /* CS, DS, SS, ES, CPL */
 203         VMCB_CR2,        /* CR2 only */
 204         VMCB_LBR,        /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
 205         VMCB_DIRTY_MAX,
 206 };
 207
 208 /* TPR and CR2 are always written before VMRUN */
 209 #define VMCB_ALWAYS_DIRTY_MASK  ((1U << VMCB_INTR) | (1U << VMCB_CR2))
 210
 211 static inline void mark_all_dirty(struct vmcb *vmcb)
 212 {
 213         vmcb->control.clean = 0;
 214 }
 215
 216 static inline void mark_all_clean(struct vmcb *vmcb)
 217 {
 218         vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1)
 219                                & ~VMCB_ALWAYS_DIRTY_MASK;
 220 }
 221
 222 static inline void mark_dirty(struct vmcb *vmcb, int bit)
 223 {
 224         vmcb->control.clean &= ~(1 << bit);
 225 }
 226
 227 static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
 228 {
 229         return container_of(vcpu, struct vcpu_svm, vcpu);
 230 }
 231
 232 static void recalc_intercepts(struct vcpu_svm *svm)
 233 {
 234         struct vmcb_control_area *c, *h;
 235         struct nested_state *g;
 236
 237         mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 238
 239         if (!is_guest_mode(&svm->vcpu))
 240                 return;
 241
 242         c = &svm->vmcb->control;
 243         h = &svm->nested.hsave->control;
 244         g = &svm->nested;
 245
 246         c->intercept_cr = h->intercept_cr | g->intercept_cr;
 247         c->intercept_dr = h->intercept_dr | g->intercept_dr;
 248         c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions;
 249         c->intercept = h->intercept | g->intercept;
 250 }
 251
 252 static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
 253 {
 254         if (is_guest_mode(&svm->vcpu))
 255                 return svm->nested.hsave;
 256         else
 257                 return svm->vmcb;
 258 }
 259
 260 static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
 261 {
 262         struct vmcb *vmcb = get_host_vmcb(svm);
 263
 264         vmcb->control.intercept_cr |= (1U << bit);
 265
 266         recalc_intercepts(svm);
 267 }
 268
 269 static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
 270 {
 271         struct vmcb *vmcb = get_host_vmcb(svm);
 272
 273         vmcb->control.intercept_cr &= ~(1U << bit);
 274
 275         recalc_intercepts(svm);
 276 }
 277
 278 static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
 279 {
 280         struct vmcb *vmcb = get_host_vmcb(svm);
 281
 282         return vmcb->control.intercept_cr & (1U << bit);
 283 }
 284
 285 static inline void set_dr_intercept(struct vcpu_svm *svm, int bit)
 286 {
 287         struct vmcb *vmcb = get_host_vmcb(svm);
 288
 289         vmcb->control.intercept_dr |= (1U << bit);
 290
 291         recalc_intercepts(svm);
 292 }
 293
 294 static inline void clr_dr_intercept(struct vcpu_svm *svm, int bit)
 295 {
 296         struct vmcb *vmcb = get_host_vmcb(svm);
 297
 298         vmcb->control.intercept_dr &= ~(1U << bit);
 299
 300         recalc_intercepts(svm);
 301 }
 302
 303 static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
 304 {
 305         struct vmcb *vmcb = get_host_vmcb(svm);
 306
 307         vmcb->control.intercept_exceptions |= (1U << bit);
 308
 309         recalc_intercepts(svm);
 310 }
 311
 312 static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
 313 {
 314         struct vmcb *vmcb = get_host_vmcb(svm);
 315
 316         vmcb->control.intercept_exceptions &= ~(1U << bit);
 317
 318         recalc_intercepts(svm);
 319 }
 320
 321 static inline void set_intercept(struct vcpu_svm *svm, int bit)
 322 {
 323         struct vmcb *vmcb = get_host_vmcb(svm);
 324
 325         vmcb->control.intercept |= (1ULL << bit);
 326
 327         recalc_intercepts(svm);
 328 }
 329
 330 static inline void clr_intercept(struct vcpu_svm *svm, int bit)
 331 {
 332         struct vmcb *vmcb = get_host_vmcb(svm);
 333
 334         vmcb->control.intercept &= ~(1ULL << bit);
 335
 336         recalc_intercepts(svm);
 337 }
 338
 339 static inline void enable_gif(struct vcpu_svm *svm)
 340 {
 341         svm->vcpu.arch.hflags |= HF_GIF_MASK;
 342 }
 343
 344 static inline void disable_gif(struct vcpu_svm *svm)
 345 {
 346         svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
 347 }
 348
 349 static inline bool gif_set(struct vcpu_svm *svm)
 350 {
 351         return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
 352 }
 353
 354 static unsigned long iopm_base;
 355
 356 struct kvm_ldttss_desc {
 357         u16 limit0;
 358         u16 base0;
 359         unsigned base1:8, type:5, dpl:2, p:1;
 360         unsigned limit1:4, zero0:3, g:1, base2:8;
 361         u32 base3;
 362         u32 zero1;
 363 } __attribute__((packed));
 364
 365 struct svm_cpu_data {
 366         int cpu;
 367
 368         u64 asid_generation;
 369         u32 max_asid;
 370         u32 next_asid;
 371         struct kvm_ldttss_desc *tss_desc;
 372
 373         struct page *save_area;
 374 };
 375
 376 static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
 377 static uint32_t svm_features;
 378
 379 struct svm_init_data {
 380         int cpu;
 381         int r;
 382 };
 383
 384 static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
 385
 386 #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
 387 #define MSRS_RANGE_SIZE 2048
 388 #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
 389
 390 static u32 svm_msrpm_offset(u32 msr)
 391 {
 392         u32 offset;
 393         int i;
 394
 395         for (i = 0; i < NUM_MSR_MAPS; i++) {
 396                 if (msr < msrpm_ranges[i] ||
 397                     msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
 398                         continue;
 399
 400                 offset  = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
 401                 offset += (i * MSRS_RANGE_SIZE);       /* add range offset */
 402
 403                 /* Now we have the u8 offset - but need the u32 offset */
 404                 return offset / 4;
 405         }
 406
 407         /* MSR not in any range */
 408         return MSR_INVALID;
 409 }
 410
 411 #define MAX_INST_SIZE 15
 412
 413 static inline void clgi(void)
 414 {
 415         asm volatile (__ex(SVM_CLGI));
 416 }
 417
 418 static inline void stgi(void)
 419 {
 420         asm volatile (__ex(SVM_STGI));
 421 }
 422
 423 static inline void invlpga(unsigned long addr, u32 asid)
 424 {
 425         asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
 426 }
 427
 428 static int get_npt_level(void)
 429 {
 430 #ifdef CONFIG_X86_64
 431         return PT64_ROOT_LEVEL;
 432 #else
 433         return PT32E_ROOT_LEVEL;
 434 #endif
 435 }
 436
 437 static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
 438 {
 439         vcpu->arch.efer = efer;
 440         if (!npt_enabled && !(efer & EFER_LMA))
 441                 efer &= ~EFER_LME;
 442
 443         to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
 444         mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
 445 }
 446
 447 static int is_external_interrupt(u32 info)
 448 {
 449         info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
 450         return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
 451 }
 452
 453 static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
 454 {
 455         struct vcpu_svm *svm = to_svm(vcpu);
 456         u32 ret = 0;
 457
 458         if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
 459                 ret |= KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
 460         return ret & mask;
 461 }
 462
 463 static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
 464 {
 465         struct vcpu_svm *svm = to_svm(vcpu);
 466
 467         if (mask == 0)
 468                 svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
 469         else
 470                 svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
 471
 472 }
 473
 474 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
 475 {
 476         struct vcpu_svm *svm = to_svm(vcpu);
 477
 478         if (svm->vmcb->control.next_rip != 0)
 479                 svm->next_rip = svm->vmcb->control.next_rip;
 480
 481         if (!svm->next_rip) {
 482                 if (emulate_instruction(vcpu, EMULTYPE_SKIP) !=
 483                                 EMULATE_DONE)
 484                         printk(KERN_DEBUG "%s: NOP\n", __func__);
 485                 return;
 486         }
 487         if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
 488                 printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
 489                        __func__, kvm_rip_read(vcpu), svm->next_rip);
 490
 491         kvm_rip_write(vcpu, svm->next_rip);
 492         svm_set_interrupt_shadow(vcpu, 0);
 493 }
 494
 495 static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 496                                 bool has_error_code, u32 error_code,
 497                                 bool reinject)
 498 {
 499         struct vcpu_svm *svm = to_svm(vcpu);
 500
 501         /*
 502          * If we are within a nested VM we'd better #VMEXIT and let the guest
 503          * handle the exception
 504          */
 505         if (!reinject &&
 506             nested_svm_check_exception(svm, nr, has_error_code, error_code))
 507                 return;
 508
 509         if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) {
 510                 unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);
 511
 512                 /*
 513                  * For guest debugging where we have to reinject #BP if some
 514                  * INT3 is guest-owned:
 515                  * Emulate nRIP by moving RIP forward. Will fail if injection
 516                  * raises a fault that is not intercepted. Still better than
 517                  * failing in all cases.
 518                  */
 519                 skip_emulated_instruction(&svm->vcpu);
 520                 rip = kvm_rip_read(&svm->vcpu);
 521                 svm->int3_rip = rip + svm->vmcb->save.cs.base;
 522                 svm->int3_injected = rip - old_rip;
 523         }
 524
 525         svm->vmcb->control.event_inj = nr
 526                 | SVM_EVTINJ_VALID
 527                 | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
 528                 | SVM_EVTINJ_TYPE_EXEPT;
 529         svm->vmcb->control.event_inj_err = error_code;
 530 }
 531
 532 static void svm_init_erratum_383(void)
 533 {
 534         u32 low, high;
 535         int err;
 536         u64 val;
 537
 538         if (!cpu_has_amd_erratum(amd_erratum_383))
 539                 return;
 540
 541         /* Use _safe variants to not break nested virtualization */
 542         val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
 543         if (err)
 544                 return;
 545
 546         val |= (1ULL << 47);
 547
 548         low  = lower_32_bits(val);
 549         high = upper_32_bits(val);
 550
 551         native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);
 552
 553         erratum_383_found = true;
 554 }
 555
 556 static int has_svm(void)
 557 {
 558         const char *msg;
 559
 560         if (!cpu_has_svm(&msg)) {
 561                 printk(KERN_INFO "has_svm: %s\n", msg);
 562                 return 0;
 563         }
 564
 565         return 1;
 566 }
 567
 568 static void svm_hardware_disable(void *garbage)
 569 {
 570         cpu_svm_disable();
 571 }
 572
 573 static int svm_hardware_enable(void *garbage)
 574 {
 575
 576         struct svm_cpu_data *sd;
 577         uint64_t efer;
 578         struct desc_ptr gdt_descr;
 579         struct desc_struct *gdt;
 580         int me = raw_smp_processor_id();
 581
 582         rdmsrl(MSR_EFER, efer);
 583         if (efer & EFER_SVME)
 584                 return -EBUSY;
 585
 586         if (!has_svm()) {
 587                 printk(KERN_ERR "svm_hardware_enable: err EOPNOTSUPP on %d\n",
 588                        me);
 589                 return -EINVAL;
 590         }
 591         sd = per_cpu(svm_data, me);
 592
 593         if (!sd) {
 594                 printk(KERN_ERR "svm_hardware_enable: svm_data is NULL on %d\n",
 595                        me);
 596                 return -EINVAL;
 597         }
 598
 599         sd->asid_generation = 1;
 600         sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
 601         sd->next_asid = sd->max_asid + 1;
 602
 603         native_store_gdt(&gdt_descr);
 604         gdt = (struct desc_struct *)gdt_descr.address;
 605         sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
 606
 607         wrmsrl(MSR_EFER, efer | EFER_SVME);
 608
 609         wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
 610
 611         svm_init_erratum_383();
 612
 613         return 0;
 614 }
 615
 616 static void svm_cpu_uninit(int cpu)
 617 {
 618         struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
 619
 620         if (!sd)
 621                 return;
 622
 623         per_cpu(svm_data, raw_smp_processor_id()) = NULL;
 624         __free_page(sd->save_area);
 625         kfree(sd);
 626 }
 627
 628 static int svm_cpu_init(int cpu)
 629 {
 630         struct svm_cpu_data *sd;
 631         int r;
 632
 633         sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
 634         if (!sd)
 635                 return -ENOMEM;
 636         sd->cpu = cpu;
 637         sd->save_area = alloc_page(GFP_KERNEL);
 638         r = -ENOMEM;
 639         if (!sd->save_area)
 640                 goto err_1;
 641
 642         per_cpu(svm_data, cpu) = sd;
 643
 644         return 0;
 645
 646 err_1:
 647         kfree(sd);
 648         return r;
 649
 650 }
 651
 652 static bool valid_msr_intercept(u32 index)
 653 {
 654         int i;
 655
 656         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
 657                 if (direct_access_msrs[i].index == index)
 658                         return true;
 659
 660         return false;
 661 }
 662
 663 static void set_msr_interception(u32 *msrpm, unsigned msr,
 664                                  int read, int write)
 665 {
 666         u8 bit_read, bit_write;
 667         unsigned long tmp;
 668         u32 offset;
 669
 670         /*
 671          * If this warning triggers extend the direct_access_msrs list at the
 672          * beginning of the file
 673          */
 674         WARN_ON(!valid_msr_intercept(msr));
 675
 676         offset    = svm_msrpm_offset(msr);
 677         bit_read  = 2 * (msr & 0x0f);
 678         bit_write = 2 * (msr & 0x0f) + 1;
 679         tmp       = msrpm[offset];
 680
 681         BUG_ON(offset == MSR_INVALID);
 682
 683         read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);
 684         write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
 685
 686         msrpm[offset] = tmp;
 687 }
 688
 689 static void svm_vcpu_init_msrpm(u32 *msrpm)
 690 {
 691         int i;
 692
 693         memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
 694
 695         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
 696                 if (!direct_access_msrs[i].always)
 697                         continue;
 698
 699                 set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
 700         }
 701 }
 702
 703 static void add_msr_offset(u32 offset)
 704 {
 705         int i;
 706
 707         for (i = 0; i < MSRPM_OFFSETS; ++i) {
 708
 709                 /* Offset already in list? */
 710                 if (msrpm_offsets[i] == offset)
 711                         return;
 712
 713                 /* Slot used by another offset? */
 714                 if (msrpm_offsets[i] != MSR_INVALID)
 715                         continue;
 716
 717                 /* Add offset to list */
 718                 msrpm_offsets[i] = offset;
 719
 720                 return;
 721         }
 722
 723         /*
 724          * If this BUG triggers the msrpm_offsets table has an overflow. Just
 725          * increase MSRPM_OFFSETS in this case.
 726          */
 727         BUG();
 728 }
 729
 730 static void init_msrpm_offsets(void)
 731 {
 732         int i;
 733
 734         memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));
 735
 736         for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
 737                 u32 offset;
 738
 739                 offset = svm_msrpm_offset(direct_access_msrs[i].index);
 740                 BUG_ON(offset == MSR_INVALID);
 741
 742                 add_msr_offset(offset);
 743         }
 744 }
 745
 746 static void svm_enable_lbrv(struct vcpu_svm *svm)
 747 {
 748         u32 *msrpm = svm->msrpm;
 749
 750         svm->vmcb->control.lbr_ctl = 1;
 751         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
 752         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
 753         set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
 754         set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
 755 }
 756
 757 static void svm_disable_lbrv(struct vcpu_svm *svm)
 758 {
 759         u32 *msrpm = svm->msrpm;
 760
 761         svm->vmcb->control.lbr_ctl = 0;
 762         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
 763         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
 764         set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
 765         set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
 766 }
 767
 768 static __init int svm_hardware_setup(void)
 769 {
 770         int cpu;
 771         struct page *iopm_pages;
 772         void *iopm_va;
 773         int r;
 774
 775         iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
 776
 777         if (!iopm_pages)
 778                 return -ENOMEM;
 779
 780         iopm_va = page_address(iopm_pages);
 781         memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
 782         iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
 783
 784         init_msrpm_offsets();
 785
 786         if (boot_cpu_has(X86_FEATURE_NX))
 787                 kvm_enable_efer_bits(EFER_NX);
 788
 789         if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
 790                 kvm_enable_efer_bits(EFER_FFXSR);
 791
 792         if (nested) {
 793                 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
 794                 kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
 795         }
 796
 797         for_each_possible_cpu(cpu) {
 798                 r = svm_cpu_init(cpu);
 799                 if (r)
 800                         goto err;
 801         }
 802
 803         svm_features = cpuid_edx(SVM_CPUID_FUNC);
 804
 805         if (!boot_cpu_has(X86_FEATURE_NPT))
 806                 npt_enabled = false;
 807
 808         if (npt_enabled && !npt) {
 809                 printk(KERN_INFO "kvm: Nested Paging disabled\n");
 810                 npt_enabled = false;
 811         }
 812
 813         if (npt_enabled) {
 814                 printk(KERN_INFO "kvm: Nested Paging enabled\n");
 815                 kvm_enable_tdp();
 816         } else
 817                 kvm_disable_tdp();
 818
 819         return 0;
 820
 821 err:
 822         __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
 823         iopm_base = 0;
 824         return r;
 825 }
 826
 827 static __exit void svm_hardware_unsetup(void)
 828 {
 829         int cpu;
 830
 831         for_each_possible_cpu(cpu)
 832                 svm_cpu_uninit(cpu);
 833
 834         __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
 835         iopm_base = 0;
 836 }
 837
 838 static void init_seg(struct vmcb_seg *seg)
 839 {
 840         seg->selector = 0;
 841         seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
 842                       SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
 843         seg->limit = 0xffff;
 844         seg->base = 0;
 845 }
 846
 847 static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
 848 {
 849         seg->selector = 0;
 850         seg->attrib = SVM_SELECTOR_P_MASK | type;
 851         seg->limit = 0xffff;
 852         seg->base = 0;
 853 }
 854
 855 static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
 856 {
 857         struct vcpu_svm *svm = to_svm(vcpu);
 858         u64 g_tsc_offset = 0;
 859
 860         if (is_guest_mode(vcpu)) {
 861                 g_tsc_offset = svm->vmcb->control.tsc_offset -
 862                                svm->nested.hsave->control.tsc_offset;
 863                 svm->nested.hsave->control.tsc_offset = offset;
 864         }
 865
 866         svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
 867
 868         mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 869 }
 870
 871 static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
 872 {
 873         struct vcpu_svm *svm = to_svm(vcpu);
 874
 875         svm->vmcb->control.tsc_offset += adjustment;
 876         if (is_guest_mode(vcpu))
 877                 svm->nested.hsave->control.tsc_offset += adjustment;
 878         mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 879 }
 880
 881 static void init_vmcb(struct vcpu_svm *svm)
 882 {
 883         struct vmcb_control_area *control = &svm->vmcb->control;
 884         struct vmcb_save_area *save = &svm->vmcb->save;
 885
 886         svm->vcpu.fpu_active = 1;
 887         svm->vcpu.arch.hflags = 0;
 888
 889         set_cr_intercept(svm, INTERCEPT_CR0_READ);
 890         set_cr_intercept(svm, INTERCEPT_CR3_READ);
 891         set_cr_intercept(svm, INTERCEPT_CR4_READ);
 892         set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
 893         set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
 894         set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
 895         set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
 896
 897         set_dr_intercept(svm, INTERCEPT_DR0_READ);
 898         set_dr_intercept(svm, INTERCEPT_DR1_READ);
 899         set_dr_intercept(svm, INTERCEPT_DR2_READ);
 900         set_dr_intercept(svm, INTERCEPT_DR3_READ);
 901         set_dr_intercept(svm, INTERCEPT_DR4_READ);
 902         set_dr_intercept(svm, INTERCEPT_DR5_READ);
 903         set_dr_intercept(svm, INTERCEPT_DR6_READ);
 904         set_dr_intercept(svm, INTERCEPT_DR7_READ);
 905
 906         set_dr_intercept(svm, INTERCEPT_DR0_WRITE);
 907         set_dr_intercept(svm, INTERCEPT_DR1_WRITE);
 908         set_dr_intercept(svm, INTERCEPT_DR2_WRITE);
 909         set_dr_intercept(svm, INTERCEPT_DR3_WRITE);
 910         set_dr_intercept(svm, INTERCEPT_DR4_WRITE);
 911         set_dr_intercept(svm, INTERCEPT_DR5_WRITE);
 912         set_dr_intercept(svm, INTERCEPT_DR6_WRITE);
 913         set_dr_intercept(svm, INTERCEPT_DR7_WRITE);
 914
 915         set_exception_intercept(svm, PF_VECTOR);
 916         set_exception_intercept(svm, UD_VECTOR);
 917         set_exception_intercept(svm, MC_VECTOR);
 918
 919         set_intercept(svm, INTERCEPT_INTR);
 920         set_intercept(svm, INTERCEPT_NMI);
 921         set_intercept(svm, INTERCEPT_SMI);
 922         set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
 923         set_intercept(svm, INTERCEPT_CPUID);
 924         set_intercept(svm, INTERCEPT_INVD);
 925         set_intercept(svm, INTERCEPT_HLT);
 926         set_intercept(svm, INTERCEPT_INVLPG);
 927         set_intercept(svm, INTERCEPT_INVLPGA);
 928         set_intercept(svm, INTERCEPT_IOIO_PROT);
 929         set_intercept(svm, INTERCEPT_MSR_PROT);
 930         set_intercept(svm, INTERCEPT_TASK_SWITCH);
 931         set_intercept(svm, INTERCEPT_SHUTDOWN);
 932         set_intercept(svm, INTERCEPT_VMRUN);
 933         set_intercept(svm, INTERCEPT_VMMCALL);
 934         set_intercept(svm, INTERCEPT_VMLOAD);
 935         set_intercept(svm, INTERCEPT_VMSAVE);
 936         set_intercept(svm, INTERCEPT_STGI);
 937         set_intercept(svm, INTERCEPT_CLGI);
 938         set_intercept(svm, INTERCEPT_SKINIT);
 939         set_intercept(svm, INTERCEPT_WBINVD);
 940         set_intercept(svm, INTERCEPT_MONITOR);
 941         set_intercept(svm, INTERCEPT_MWAIT);
 942         set_intercept(svm, INTERCEPT_XSETBV);
 943
 944         control->iopm_base_pa = iopm_base;
 945         control->msrpm_base_pa = __pa(svm->msrpm);
 946         control->int_ctl = V_INTR_MASKING_MASK;
 947
 948         init_seg(&save->es);
 949         init_seg(&save->ss);
 950         init_seg(&save->ds);
 951         init_seg(&save->fs);
 952         init_seg(&save->gs);
 953
 954         save->cs.selector = 0xf000;
 955         /* Executable/Readable Code Segment */
 956         save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
 957                 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
 958         save->cs.limit = 0xffff;
 959         /*
 960          * cs.base should really be 0xffff0000, but vmx can't handle that, so
 961          * be consistent with it.
 962          *
 963          * Replace when we have real mode working for vmx.
 964          */
 965         save->cs.base = 0xf0000;
 966
 967         save->gdtr.limit = 0xffff;
 968         save->idtr.limit = 0xffff;
 969
 970         init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
 971         init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
 972
 973         svm_set_efer(&svm->vcpu, 0);
 974         save->dr6 = 0xffff0ff0;
 975         save->dr7 = 0x400;
 976         save->rflags = 2;
 977         save->rip = 0x0000fff0;
 978         svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
 979
 980         /*
 981          * This is the guest-visible cr0 value.
 982          * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
 983          */
 984         svm->vcpu.arch.cr0 = 0;
 985         (void)kvm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
 986
 987         save->cr4 = X86_CR4_PAE;
 988         /* rdx = ?? */
 989
 990         if (npt_enabled) {
 991                 /* Setup VMCB for Nested Paging */
 992                 control->nested_ctl = 1;
 993                 clr_intercept(svm, INTERCEPT_TASK_SWITCH);
 994                 clr_intercept(svm, INTERCEPT_INVLPG);
 995                 clr_exception_intercept(svm, PF_VECTOR);
 996                 clr_cr_intercept(svm, INTERCEPT_CR3_READ);
 997                 clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
 998                 save->g_pat = 0x0007040600070406ULL;
 999                 save->cr3 = 0;
1000                 save->cr4 = 0;
1001         }
1002         svm->asid_generation = 0;
1003
1004         svm->nested.vmcb = 0;
1005         svm->vcpu.arch.hflags = 0;
1006
1007         if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
1008                 control->pause_filter_count = 3000;
1009                 set_intercept(svm, INTERCEPT_PAUSE);
1010         }
1011
1012         mark_all_dirty(svm->vmcb);
1013
1014         enable_gif(svm);
1015 }
1016
1017 static int svm_vcpu_reset(struct kvm_vcpu *vcpu)
1018 {
1019         struct vcpu_svm *svm = to_svm(vcpu);
1020
1021         init_vmcb(svm);
1022
1023         if (!kvm_vcpu_is_bsp(vcpu)) {
1024                 kvm_rip_write(vcpu, 0);
1025                 svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12;
1026                 svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8;
1027         }
1028         vcpu->arch.regs_avail = ~0;
1029         vcpu->arch.regs_dirty = ~0;
1030
1031         return 0;
1032 }
1033
1034 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
1035 {
1036         struct vcpu_svm *svm;
1037         struct page *page;
1038         struct page *msrpm_pages;
1039         struct page *hsave_page;
1040         struct page *nested_msrpm_pages;
1041         int err;
1042
1043         svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1044         if (!svm) {
1045                 err = -ENOMEM;
1046                 goto out;
1047         }
1048
1049         err = kvm_vcpu_init(&svm->vcpu, kvm, id);
1050         if (err)
1051                 goto free_svm;
1052
1053         err = -ENOMEM;
1054         page = alloc_page(GFP_KERNEL);
1055         if (!page)
1056                 goto uninit;
1057
1058         msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
1059         if (!msrpm_pages)
1060                 goto free_page1;
1061
1062         nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
1063         if (!nested_msrpm_pages)
1064                 goto free_page2;
1065
1066         hsave_page = alloc_page(GFP_KERNEL);
1067         if (!hsave_page)
1068                 goto free_page3;
1069
1070         svm->nested.hsave = page_address(hsave_page);
1071
1072         svm->msrpm = page_address(msrpm_pages);
1073         svm_vcpu_init_msrpm(svm->msrpm);
1074
1075         svm->nested.msrpm = page_address(nested_msrpm_pages);
1076         svm_vcpu_init_msrpm(svm->nested.msrpm);
1077
1078         svm->vmcb = page_address(page);
1079         clear_page(svm->vmcb);
1080         svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
1081         svm->asid_generation = 0;
1082         init_vmcb(svm);
1083         kvm_write_tsc(&svm->vcpu, 0);
1084
1085         err = fx_init(&svm->vcpu);
1086         if (err)
1087                 goto free_page4;
1088
1089         svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
1090         if (kvm_vcpu_is_bsp(&svm->vcpu))
1091                 svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
1092
1093         return &svm->vcpu;
1094
1095 free_page4:
1096         __free_page(hsave_page);
1097 free_page3:
1098         __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
1099 free_page2:
1100         __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
1101 free_page1:
1102         __free_page(page);
1103 uninit:
1104         kvm_vcpu_uninit(&svm->vcpu);
1105 free_svm:
1106         kmem_cache_free(kvm_vcpu_cache, svm);
1107 out:
1108         return ERR_PTR(err);
1109 }
1110
1111 static void svm_free_vcpu(struct kvm_vcpu *vcpu)
1112 {
1113         struct vcpu_svm *svm = to_svm(vcpu);
1114
1115         __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
1116         __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
1117         __free_page(virt_to_page(svm->nested.hsave));
1118         __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
1119         kvm_vcpu_uninit(vcpu);
1120         kmem_cache_free(kvm_vcpu_cache, svm);
1121 }
1122
1123 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1124 {
1125         struct vcpu_svm *svm = to_svm(vcpu);
1126         int i;
1127
1128         if (unlikely(cpu != vcpu->cpu)) {
1129                 svm->asid_generation = 0;
1130                 mark_all_dirty(svm->vmcb);
1131         }
1132
1133 #ifdef CONFIG_X86_64
1134         rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
1135 #endif
1136         savesegment(fs, svm->host.fs);
1137         savesegment(gs, svm->host.gs);
1138         svm->host.ldt = kvm_read_ldt();
1139
1140         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1141                 rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1142 }
1143
1144 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
1145 {
1146         struct vcpu_svm *svm = to_svm(vcpu);
1147         int i;
1148
1149         ++vcpu->stat.host_state_reload;
1150         kvm_load_ldt(svm->host.ldt);
1151 #ifdef CONFIG_X86_64
1152         loadsegment(fs, svm->host.fs);
1153         wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs);
1154         load_gs_index(svm->host.gs);
1155 #else
1156         loadsegment(gs, svm->host.gs);
1157 #endif
1158         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1159                 wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1160 }
1161
1162 static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
1163 {
1164         return to_svm(vcpu)->vmcb->save.rflags;
1165 }
1166
1167 static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1168 {
1169         to_svm(vcpu)->vmcb->save.rflags = rflags;
1170 }
1171
1172 static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1173 {
1174         switch (reg) {
1175         case VCPU_EXREG_PDPTR:
1176                 BUG_ON(!npt_enabled);
1177                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
1178                 break;
1179         default:
1180                 BUG();
1181         }
1182 }
1183
1184 static void svm_set_vintr(struct vcpu_svm *svm)
1185 {
1186         set_intercept(svm, INTERCEPT_VINTR);
1187 }
1188
1189 static void svm_clear_vintr(struct vcpu_svm *svm)
1190 {
1191         clr_intercept(svm, INTERCEPT_VINTR);
1192 }
1193
1194 static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
1195 {
1196         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1197
1198         switch (seg) {
1199         case VCPU_SREG_CS: return &save->cs;
1200         case VCPU_SREG_DS: return &save->ds;
1201         case VCPU_SREG_ES: return &save->es;
1202         case VCPU_SREG_FS: return &save->fs;
1203         case VCPU_SREG_GS: return &save->gs;
1204         case VCPU_SREG_SS: return &save->ss;
1205         case VCPU_SREG_TR: return &save->tr;
1206         case VCPU_SREG_LDTR: return &save->ldtr;
1207         }
1208         BUG();
1209         return NULL;
1210 }
1211
1212 static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1213 {
1214         struct vmcb_seg *s = svm_seg(vcpu, seg);
1215
1216         return s->base;
1217 }
1218
1219 static void svm_get_segment(struct kvm_vcpu *vcpu,
1220                             struct kvm_segment *var, int seg)
1221 {
1222         struct vmcb_seg *s = svm_seg(vcpu, seg);
1223
1224         var->base = s->base;
1225         var->limit = s->limit;
1226         var->selector = s->selector;
1227         var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
1228         var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
1229         var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
1230         var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
1231         var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
1232         var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
1233         var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
1234         var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
1235
1236         /*
1237          * AMD's VMCB does not have an explicit unusable field, so emulate it
1238          * for cross vendor migration purposes by "not present"
1239          */
1240         var->unusable = !var->present || (var->type == 0);
1241
1242         switch (seg) {
1243         case VCPU_SREG_CS:
1244                 /*
1245                  * SVM always stores 0 for the 'G' bit in the CS selector in
1246                  * the VMCB on a VMEXIT. This hurts cross-vendor migration:
1247                  * Intel's VMENTRY has a check on the 'G' bit.
1248                  */
1249                 var->g = s->limit > 0xfffff;
1250                 break;
1251         case VCPU_SREG_TR:
1252                 /*
1253                  * Work around a bug where the busy flag in the tr selector
1254                  * isn't exposed
1255                  */
1256                 var->type |= 0x2;
1257                 break;
1258         case VCPU_SREG_DS:
1259         case VCPU_SREG_ES:
1260         case VCPU_SREG_FS:
1261         case VCPU_SREG_GS:
1262                 /*
1263                  * The accessed bit must always be set in the segment
1264                  * descriptor cache, although it can be cleared in the
1265                  * descriptor, the cached bit always remains at 1. Since
1266                  * Intel has a check on this, set it here to support
1267                  * cross-vendor migration.
1268                  */
1269                 if (!var->unusable)
1270                         var->type |= 0x1;
1271                 break;
1272         case VCPU_SREG_SS:
1273                 /*
1274                  * On AMD CPUs sometimes the DB bit in the segment
1275                  * descriptor is left as 1, although the whole segment has
1276                  * been made unusable. Clear it here to pass an Intel VMX
1277                  * entry check when cross vendor migrating.
1278                  */
1279                 if (var->unusable)
1280                         var->db = 0;
1281                 break;
1282         }
1283 }
1284
1285 static int svm_get_cpl(struct kvm_vcpu *vcpu)
1286 {
1287         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1288
1289         return save->cpl;
1290 }
1291
1292 static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1293 {
1294         struct vcpu_svm *svm = to_svm(vcpu);
1295
1296         dt->size = svm->vmcb->save.idtr.limit;
1297         dt->address = svm->vmcb->save.idtr.base;
1298 }
1299
1300 static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1301 {
1302         struct vcpu_svm *svm = to_svm(vcpu);
1303
1304         svm->vmcb->save.idtr.limit = dt->size;
1305         svm->vmcb->save.idtr.base = dt->address ;
1306         mark_dirty(svm->vmcb, VMCB_DT);
1307 }
1308
1309 static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1310 {
1311         struct vcpu_svm *svm = to_svm(vcpu);
1312
1313         dt->size = svm->vmcb->save.gdtr.limit;
1314         dt->address = svm->vmcb->save.gdtr.base;
1315 }
1316
1317 static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1318 {
1319         struct vcpu_svm *svm = to_svm(vcpu);
1320
1321         svm->vmcb->save.gdtr.limit = dt->size;
1322         svm->vmcb->save.gdtr.base = dt->address ;
1323         mark_dirty(svm->vmcb, VMCB_DT);
1324 }
1325
1326 static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
1327 {
1328 }
1329
1330 static void svm_decache_cr3(struct kvm_vcpu *vcpu)
1331 {
1332 }
1333
1334 static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1335 {
1336 }
1337
1338 static void update_cr0_intercept(struct vcpu_svm *svm)
1339 {
1340         ulong gcr0 = svm->vcpu.arch.cr0;
1341         u64 *hcr0 = &svm->vmcb->save.cr0;
1342
1343         if (!svm->vcpu.fpu_active)
1344                 *hcr0 |= SVM_CR0_SELECTIVE_MASK;
1345         else
1346                 *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
1347                         | (gcr0 & SVM_CR0_SELECTIVE_MASK);
1348
1349         mark_dirty(svm->vmcb, VMCB_CR);
1350
1351         if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
1352                 clr_cr_intercept(svm, INTERCEPT_CR0_READ);
1353                 clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
1354         } else {
1355                 set_cr_intercept(svm, INTERCEPT_CR0_READ);
1356                 set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
1357         }
1358 }
1359
1360 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1361 {
1362         struct vcpu_svm *svm = to_svm(vcpu);
1363
1364         if (is_guest_mode(vcpu)) {
1365                 /*
1366                  * We are here because we run in nested mode, the host kvm
1367                  * intercepts cr0 writes but the l1 hypervisor does not.
1368                  * But the L1 hypervisor may intercept selective cr0 writes.
1369                  * This needs to be checked here.
1370                  */
1371                 unsigned long old, new;
1372
1373                 /* Remove bits that would trigger a real cr0 write intercept */
1374                 old = vcpu->arch.cr0 & SVM_CR0_SELECTIVE_MASK;
1375                 new = cr0 & SVM_CR0_SELECTIVE_MASK;
1376
1377                 if (old == new) {
1378                         /* cr0 write with ts and mp unchanged */
1379                         svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
1380                         if (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE) {
1381                                 svm->nested.vmexit_rip = kvm_rip_read(vcpu);
1382                                 svm->nested.vmexit_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
1383                                 svm->nested.vmexit_rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
1384                                 return;
1385                         }
1386                 }
1387         }
1388
1389 #ifdef CONFIG_X86_64
1390         if (vcpu->arch.efer & EFER_LME) {
1391                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
1392                         vcpu->arch.efer |= EFER_LMA;
1393                         svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
1394                 }
1395
1396                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
1397                         vcpu->arch.efer &= ~EFER_LMA;
1398                         svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
1399                 }
1400         }
1401 #endif
1402         vcpu->arch.cr0 = cr0;
1403
1404         if (!npt_enabled)
1405                 cr0 |= X86_CR0_PG | X86_CR0_WP;
1406
1407         if (!vcpu->fpu_active)
1408                 cr0 |= X86_CR0_TS;
1409         /*
1410          * re-enable caching here because the QEMU bios
1411          * does not do it - this results in some delay at
1412          * reboot
1413          */
1414         cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
1415         svm->vmcb->save.cr0 = cr0;
1416         mark_dirty(svm->vmcb, VMCB_CR);
1417         update_cr0_intercept(svm);
1418 }
1419
1420 static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1421 {
1422         unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
1423         unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
1424
1425         if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
1426                 svm_flush_tlb(vcpu);
1427
1428         vcpu->arch.cr4 = cr4;
1429         if (!npt_enabled)
1430                 cr4 |= X86_CR4_PAE;
1431         cr4 |= host_cr4_mce;
1432         to_svm(vcpu)->vmcb->save.cr4 = cr4;
1433         mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
1434 }
1435
1436 static void svm_set_segment(struct kvm_vcpu *vcpu,
1437                             struct kvm_segment *var, int seg)
1438 {
1439         struct vcpu_svm *svm = to_svm(vcpu);
1440         struct vmcb_seg *s = svm_seg(vcpu, seg);
1441
1442         s->base = var->base;
1443         s->limit = var->limit;
1444         s->selector = var->selector;
1445         if (var->unusable)
1446                 s->attrib = 0;
1447         else {
1448                 s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
1449                 s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
1450                 s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
1451                 s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
1452                 s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
1453                 s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
1454                 s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
1455                 s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
1456         }
1457         if (seg == VCPU_SREG_CS)
1458                 svm->vmcb->save.cpl
1459                         = (svm->vmcb->save.cs.attrib
1460                            >> SVM_SELECTOR_DPL_SHIFT) & 3;
1461
1462         mark_dirty(svm->vmcb, VMCB_SEG);
1463 }
1464
1465 static void update_db_intercept(struct kvm_vcpu *vcpu)
1466 {
1467         struct vcpu_svm *svm = to_svm(vcpu);
1468
1469         clr_exception_intercept(svm, DB_VECTOR);
1470         clr_exception_intercept(svm, BP_VECTOR);
1471
1472         if (svm->nmi_singlestep)
1473                 set_exception_intercept(svm, DB_VECTOR);
1474
1475         if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
1476                 if (vcpu->guest_debug &
1477                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
1478                         set_exception_intercept(svm, DB_VECTOR);
1479                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
1480                         set_exception_intercept(svm, BP_VECTOR);
1481         } else
1482                 vcpu->guest_debug = 0;
1483 }
1484
1485 static void svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1486 {
1487         struct vcpu_svm *svm = to_svm(vcpu);
1488
1489         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1490                 svm->vmcb->save.dr7 = dbg->arch.debugreg[7];
1491         else
1492                 svm->vmcb->save.dr7 = vcpu->arch.dr7;
1493
1494         mark_dirty(svm->vmcb, VMCB_DR);
1495
1496         update_db_intercept(vcpu);
1497 }
1498
1499 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
1500 {
1501         if (sd->next_asid > sd->max_asid) {
1502                 ++sd->asid_generation;
1503                 sd->next_asid = 1;
1504                 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
1505         }
1506
1507         svm->asid_generation = sd->asid_generation;
1508         svm->vmcb->control.asid = sd->next_asid++;
1509
1510         mark_dirty(svm->vmcb, VMCB_ASID);
1511 }
1512
1513 static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
1514 {
1515         struct vcpu_svm *svm = to_svm(vcpu);
1516
1517         svm->vmcb->save.dr7 = value;
1518         mark_dirty(svm->vmcb, VMCB_DR);
1519 }
1520
1521 static int pf_interception(struct vcpu_svm *svm)
1522 {
1523         u64 fault_address = svm->vmcb->control.exit_info_2;
1524         u32 error_code;
1525         int r = 1;
1526
1527         switch (svm->apf_reason) {
1528         default:
1529                 error_code = svm->vmcb->control.exit_info_1;
1530
1531                 trace_kvm_page_fault(fault_address, error_code);
1532                 if (!npt_enabled && kvm_event_needs_reinjection(&svm->vcpu))
1533                         kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
1534                 r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
1535                         svm->vmcb->control.insn_bytes,
1536                         svm->vmcb->control.insn_len);
1537                 break;
1538         case KVM_PV_REASON_PAGE_NOT_PRESENT:
1539                 svm->apf_reason = 0;
1540                 local_irq_disable();
1541                 kvm_async_pf_task_wait(fault_address);
1542                 local_irq_enable();
1543                 break;
1544         case KVM_PV_REASON_PAGE_READY:
1545                 svm->apf_reason = 0;
1546                 local_irq_disable();
1547                 kvm_async_pf_task_wake(fault_address);
1548                 local_irq_enable();
1549                 break;
1550         }
1551         return r;
1552 }
1553
1554 static int db_interception(struct vcpu_svm *svm)
1555 {
1556         struct kvm_run *kvm_run = svm->vcpu.run;
1557
1558         if (!(svm->vcpu.guest_debug &
1559               (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
1560                 !svm->nmi_singlestep) {
1561                 kvm_queue_exception(&svm->vcpu, DB_VECTOR);
1562                 return 1;
1563         }
1564
1565         if (svm->nmi_singlestep) {
1566                 svm->nmi_singlestep = false;
1567                 if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
1568                         svm->vmcb->save.rflags &=
1569                                 ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1570                 update_db_intercept(&svm->vcpu);
1571         }
1572
1573         if (svm->vcpu.guest_debug &
1574             (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
1575                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
1576                 kvm_run->debug.arch.pc =
1577                         svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1578                 kvm_run->debug.arch.exception = DB_VECTOR;
1579                 return 0;
1580         }
1581
1582         return 1;
1583 }
1584
1585 static int bp_interception(struct vcpu_svm *svm)
1586 {
1587         struct kvm_run *kvm_run = svm->vcpu.run;
1588
1589         kvm_run->exit_reason = KVM_EXIT_DEBUG;
1590         kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1591         kvm_run->debug.arch.exception = BP_VECTOR;
1592         return 0;
1593 }
1594
1595 static int ud_interception(struct vcpu_svm *svm)
1596 {
1597         int er;
1598
1599         er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
1600         if (er != EMULATE_DONE)
1601                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1602         return 1;
1603 }
1604
1605 static void svm_fpu_activate(struct kvm_vcpu *vcpu)
1606 {
1607         struct vcpu_svm *svm = to_svm(vcpu);
1608
1609         clr_exception_intercept(svm, NM_VECTOR);
1610
1611         svm->vcpu.fpu_active = 1;
1612         update_cr0_intercept(svm);
1613 }
1614
1615 static int nm_interception(struct vcpu_svm *svm)
1616 {
1617         svm_fpu_activate(&svm->vcpu);
1618         return 1;
1619 }
1620
1621 static bool is_erratum_383(void)
1622 {
1623         int err, i;
1624         u64 value;
1625
1626         if (!erratum_383_found)
1627                 return false;
1628
1629         value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
1630         if (err)
1631                 return false;
1632
1633         /* Bit 62 may or may not be set for this mce */
1634         value &= ~(1ULL << 62);
1635
1636         if (value != 0xb600000000010015ULL)
1637                 return false;
1638
1639         /* Clear MCi_STATUS registers */
1640         for (i = 0; i < 6; ++i)
1641                 native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);
1642
1643         value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
1644         if (!err) {
1645                 u32 low, high;
1646
1647                 value &= ~(1ULL << 2);
1648                 low    = lower_32_bits(value);
1649                 high   = upper_32_bits(value);
1650
1651                 native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
1652         }
1653
1654         /* Flush tlb to evict multi-match entries */
1655         __flush_tlb_all();
1656
1657         return true;
1658 }
1659
1660 static void svm_handle_mce(struct vcpu_svm *svm)
1661 {
1662         if (is_erratum_383()) {
1663                 /*
1664                  * Erratum 383 triggered. Guest state is corrupt so kill the
1665                  * guest.
1666                  */
1667                 pr_err("KVM: Guest triggered AMD Erratum 383\n");
1668
1669                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
1670
1671                 return;
1672         }
1673
1674         /*
1675          * On an #MC intercept the MCE handler is not called automatically in
1676          * the host. So do it by hand here.
1677          */
1678         asm volatile (
1679                 "int $0x12\n");
1680         /* not sure if we ever come back to this point */
1681
1682         return;
1683 }
1684
1685 static int mc_interception(struct vcpu_svm *svm)
1686 {
1687         return 1;
1688 }
1689
1690 static int shutdown_interception(struct vcpu_svm *svm)
1691 {
1692         struct kvm_run *kvm_run = svm->vcpu.run;
1693
1694         /*
1695          * VMCB is undefined after a SHUTDOWN intercept
1696          * so reinitialize it.
1697          */
1698         clear_page(svm->vmcb);
1699         init_vmcb(svm);
1700
1701         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
1702         return 0;
1703 }
1704
1705 static int io_interception(struct vcpu_svm *svm)
1706 {
1707         struct kvm_vcpu *vcpu = &svm->vcpu;
1708         u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
1709         int size, in, string;
1710         unsigned port;
1711
1712         ++svm->vcpu.stat.io_exits;
1713         string = (io_info & SVM_IOIO_STR_MASK) != 0;
1714         in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
1715         if (string || in)
1716                 return emulate_instruction(vcpu, 0) == EMULATE_DONE;
1717
1718         port = io_info >> 16;
1719         size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
1720         svm->next_rip = svm->vmcb->control.exit_info_2;
1721         skip_emulated_instruction(&svm->vcpu);
1722
1723         return kvm_fast_pio_out(vcpu, size, port);
1724 }
1725
1726 static int nmi_interception(struct vcpu_svm *svm)
1727 {
1728         return 1;
1729 }
1730
1731 static int intr_interception(struct vcpu_svm *svm)
1732 {
1733         ++svm->vcpu.stat.irq_exits;
1734         return 1;
1735 }
1736
1737 static int nop_on_interception(struct vcpu_svm *svm)
1738 {
1739         return 1;
1740 }
1741
1742 static int halt_interception(struct vcpu_svm *svm)
1743 {
1744         svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
1745         skip_emulated_instruction(&svm->vcpu);
1746         return kvm_emulate_halt(&svm->vcpu);
1747 }
1748
1749 static int vmmcall_interception(struct vcpu_svm *svm)
1750 {
1751         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1752         skip_emulated_instruction(&svm->vcpu);
1753         kvm_emulate_hypercall(&svm->vcpu);
1754         return 1;
1755 }
1756
1757 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
1758 {
1759         struct vcpu_svm *svm = to_svm(vcpu);
1760
1761         return svm->nested.nested_cr3;
1762 }
1763
1764 static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
1765                                    unsigned long root)
1766 {
1767         struct vcpu_svm *svm = to_svm(vcpu);
1768
1769         svm->vmcb->control.nested_cr3 = root;
1770         mark_dirty(svm->vmcb, VMCB_NPT);
1771         svm_flush_tlb(vcpu);
1772 }
1773
1774 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
1775                                        struct x86_exception *fault)
1776 {
1777         struct vcpu_svm *svm = to_svm(vcpu);
1778
1779         svm->vmcb->control.exit_code = SVM_EXIT_NPF;
1780         svm->vmcb->control.exit_code_hi = 0;
1781         svm->vmcb->control.exit_info_1 = fault->error_code;
1782         svm->vmcb->control.exit_info_2 = fault->address;
1783
1784         nested_svm_vmexit(svm);
1785 }
1786
1787 static int nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
1788 {
1789         int r;
1790
1791         r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu);
1792
1793         vcpu->arch.mmu.set_cr3           = nested_svm_set_tdp_cr3;
1794         vcpu->arch.mmu.get_cr3           = nested_svm_get_tdp_cr3;
1795         vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
1796         vcpu->arch.mmu.shadow_root_level = get_npt_level();
1797         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
1798
1799         return r;
1800 }
1801
1802 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
1803 {
1804         vcpu->arch.walk_mmu = &vcpu->arch.mmu;
1805 }
1806
1807 static int nested_svm_check_permissions(struct vcpu_svm *svm)
1808 {
1809         if (!(svm->vcpu.arch.efer & EFER_SVME)
1810             || !is_paging(&svm->vcpu)) {
1811                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1812                 return 1;
1813         }
1814
1815         if (svm->vmcb->save.cpl) {
1816                 kvm_inject_gp(&svm->vcpu, 0);
1817                 return 1;
1818         }
1819
1820        return 0;
1821 }
1822
1823 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
1824                                       bool has_error_code, u32 error_code)
1825 {
1826         int vmexit;
1827
1828         if (!is_guest_mode(&svm->vcpu))
1829                 return 0;
1830
1831         svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
1832         svm->vmcb->control.exit_code_hi = 0;
1833         svm->vmcb->control.exit_info_1 = error_code;
1834         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
1835
1836         vmexit = nested_svm_intercept(svm);
1837         if (vmexit == NESTED_EXIT_DONE)
1838                 svm->nested.exit_required = true;
1839
1840         return vmexit;
1841 }
1842
1843 /* This function returns true if it is save to enable the irq window */
1844 static inline bool nested_svm_intr(struct vcpu_svm *svm)
1845 {
1846         if (!is_guest_mode(&svm->vcpu))
1847                 return true;
1848
1849         if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
1850                 return true;
1851
1852         if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
1853                 return false;
1854
1855         /*
1856          * if vmexit was already requested (by intercepted exception
1857          * for instance) do not overwrite it with "external interrupt"
1858          * vmexit.
1859          */
1860         if (svm->nested.exit_required)
1861                 return false;
1862
1863         svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
1864         svm->vmcb->control.exit_info_1 = 0;
1865         svm->vmcb->control.exit_info_2 = 0;
1866
1867         if (svm->nested.intercept & 1ULL) {
1868                 /*
1869                  * The #vmexit can't be emulated here directly because this
1870                  * code path runs with irqs and preemtion disabled. A
1871                  * #vmexit emulation might sleep. Only signal request for
1872                  * the #vmexit here.
1873                  */
1874                 svm->nested.exit_required = true;
1875                 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
1876                 return false;
1877         }
1878
1879         return true;
1880 }
1881
1882 /* This function returns true if it is save to enable the nmi window */
1883 static inline bool nested_svm_nmi(struct vcpu_svm *svm)
1884 {
1885         if (!is_guest_mode(&svm->vcpu))
1886                 return true;
1887
1888         if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
1889                 return true;
1890
1891         svm->vmcb->control.exit_code = SVM_EXIT_NMI;
1892         svm->nested.exit_required = true;
1893
1894         return false;
1895 }
1896
1897 static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
1898 {
1899         struct page *page;
1900
1901         might_sleep();
1902
1903         page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
1904         if (is_error_page(page))
1905                 goto error;
1906
1907         *_page = page;
1908
1909         return kmap(page);
1910
1911 error:
1912         kvm_release_page_clean(page);
1913         kvm_inject_gp(&svm->vcpu, 0);
1914
1915         return NULL;
1916 }
1917
1918 static void nested_svm_unmap(struct page *page)
1919 {
1920         kunmap(page);
1921         kvm_release_page_dirty(page);
1922 }
1923
1924 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
1925 {
1926         unsigned port;
1927         u8 val, bit;
1928         u64 gpa;
1929
1930         if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
1931                 return NESTED_EXIT_HOST;
1932
1933         port = svm->vmcb->control.exit_info_1 >> 16;
1934         gpa  = svm->nested.vmcb_iopm + (port / 8);
1935         bit  = port % 8;
1936         val  = 0;
1937
1938         if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, 1))
1939                 val &= (1 << bit);
1940
1941         return val ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1942 }
1943
1944 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
1945 {
1946         u32 offset, msr, value;
1947         int write, mask;
1948
1949         if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
1950                 return NESTED_EXIT_HOST;
1951
1952         msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
1953         offset = svm_msrpm_offset(msr);
1954         write  = svm->vmcb->control.exit_info_1 & 1;
1955         mask   = 1 << ((2 * (msr & 0xf)) + write);
1956
1957         if (offset == MSR_INVALID)
1958                 return NESTED_EXIT_DONE;
1959
1960         /* Offset is in 32 bit units but need in 8 bit units */
1961         offset *= 4;
1962
1963         if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4))
1964                 return NESTED_EXIT_DONE;
1965
1966         return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
1967 }
1968
1969 static int nested_svm_exit_special(struct vcpu_svm *svm)
1970 {
1971         u32 exit_code = svm->vmcb->control.exit_code;
1972
1973         switch (exit_code) {
1974         case SVM_EXIT_INTR:
1975         case SVM_EXIT_NMI:
1976         case SVM_EXIT_EXCP_BASE + MC_VECTOR:
1977                 return NESTED_EXIT_HOST;
1978         case SVM_EXIT_NPF:
1979                 /* For now we are always handling NPFs when using them */
1980                 if (npt_enabled)
1981                         return NESTED_EXIT_HOST;
1982                 break;
1983         case SVM_EXIT_EXCP_BASE + PF_VECTOR:
1984                 /* When we're shadowing, trap PFs, but not async PF */
1985                 if (!npt_enabled && svm->apf_reason == 0)
1986                         return NESTED_EXIT_HOST;
1987                 break;
1988         case SVM_EXIT_EXCP_BASE + NM_VECTOR:
1989                 nm_interception(svm);
1990                 break;
1991         default:
1992                 break;
1993         }
1994
1995         return NESTED_EXIT_CONTINUE;
1996 }
1997
1998 /*
1999  * If this function returns true, this #vmexit was already handled
2000  */
2001 static int nested_svm_intercept(struct vcpu_svm *svm)
2002 {
2003         u32 exit_code = svm->vmcb->control.exit_code;
2004         int vmexit = NESTED_EXIT_HOST;
2005
2006         switch (exit_code) {
2007         case SVM_EXIT_MSR:
2008                 vmexit = nested_svm_exit_handled_msr(svm);
2009                 break;
2010         case SVM_EXIT_IOIO:
2011                 vmexit = nested_svm_intercept_ioio(svm);
2012                 break;
2013         case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
2014                 u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
2015                 if (svm->nested.intercept_cr & bit)
2016                         vmexit = NESTED_EXIT_DONE;
2017                 break;
2018         }
2019         case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
2020                 u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
2021                 if (svm->nested.intercept_dr & bit)
2022                         vmexit = NESTED_EXIT_DONE;
2023                 break;
2024         }
2025         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
2026                 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
2027                 if (svm->nested.intercept_exceptions & excp_bits)
2028                         vmexit = NESTED_EXIT_DONE;
2029                 /* async page fault always cause vmexit */
2030                 else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
2031                          svm->apf_reason != 0)
2032                         vmexit = NESTED_EXIT_DONE;
2033                 break;
2034         }
2035         case SVM_EXIT_ERR: {
2036                 vmexit = NESTED_EXIT_DONE;
2037                 break;
2038         }
2039         default: {
2040                 u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
2041                 if (svm->nested.intercept & exit_bits)
2042                         vmexit = NESTED_EXIT_DONE;
2043         }
2044         }
2045
2046         return vmexit;
2047 }
2048
2049 static int nested_svm_exit_handled(struct vcpu_svm *svm)
2050 {
2051         int vmexit;
2052
2053         vmexit = nested_svm_intercept(svm);
2054
2055         if (vmexit == NESTED_EXIT_DONE)
2056                 nested_svm_vmexit(svm);
2057
2058         return vmexit;
2059 }
2060
2061 static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
2062 {
2063         struct vmcb_control_area *dst  = &dst_vmcb->control;
2064         struct vmcb_control_area *from = &from_vmcb->control;
2065
2066         dst->intercept_cr         = from->intercept_cr;
2067         dst->intercept_dr         = from->intercept_dr;
2068         dst->intercept_exceptions = from->intercept_exceptions;
2069         dst->intercept            = from->intercept;
2070         dst->iopm_base_pa         = from->iopm_base_pa;
2071         dst->msrpm_base_pa        = from->msrpm_base_pa;
2072         dst->tsc_offset           = from->tsc_offset;
2073         dst->asid                 = from->asid;
2074         dst->tlb_ctl              = from->tlb_ctl;
2075         dst->int_ctl              = from->int_ctl;
2076         dst->int_vector           = from->int_vector;
2077         dst->int_state            = from->int_state;
2078         dst->exit_code            = from->exit_code;
2079         dst->exit_code_hi         = from->exit_code_hi;
2080         dst->exit_info_1          = from->exit_info_1;
2081         dst->exit_info_2          = from->exit_info_2;
2082         dst->exit_int_info        = from->exit_int_info;
2083         dst->exit_int_info_err    = from->exit_int_info_err;
2084         dst->nested_ctl           = from->nested_ctl;
2085         dst->event_inj            = from->event_inj;
2086         dst->event_inj_err        = from->event_inj_err;
2087         dst->nested_cr3           = from->nested_cr3;
2088         dst->lbr_ctl              = from->lbr_ctl;
2089 }
2090
2091 static int nested_svm_vmexit(struct vcpu_svm *svm)
2092 {
2093         struct vmcb *nested_vmcb;
2094         struct vmcb *hsave = svm->nested.hsave;
2095         struct vmcb *vmcb = svm->vmcb;
2096         struct page *page;
2097
2098         trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
2099                                        vmcb->control.exit_info_1,
2100                                        vmcb->control.exit_info_2,
2101                                        vmcb->control.exit_int_info,
2102                                        vmcb->control.exit_int_info_err);
2103
2104         nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
2105         if (!nested_vmcb)
2106                 return 1;
2107
2108         /* Exit Guest-Mode */
2109         leave_guest_mode(&svm->vcpu);
2110         svm->nested.vmcb = 0;
2111
2112         /* Give the current vmcb to the guest */
2113         disable_gif(svm);
2114
2115         nested_vmcb->save.es     = vmcb->save.es;
2116         nested_vmcb->save.cs     = vmcb->save.cs;
2117         nested_vmcb->save.ss     = vmcb->save.ss;
2118         nested_vmcb->save.ds     = vmcb->save.ds;
2119         nested_vmcb->save.gdtr   = vmcb->save.gdtr;
2120         nested_vmcb->save.idtr   = vmcb->save.idtr;
2121         nested_vmcb->save.efer   = svm->vcpu.arch.efer;
2122         nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
2123         nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
2124         nested_vmcb->save.cr2    = vmcb->save.cr2;
2125         nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
2126         nested_vmcb->save.rflags = vmcb->save.rflags;
2127         nested_vmcb->save.rip    = vmcb->save.rip;
2128         nested_vmcb->save.rsp    = vmcb->save.rsp;
2129         nested_vmcb->save.rax    = vmcb->save.rax;
2130         nested_vmcb->save.dr7    = vmcb->save.dr7;
2131         nested_vmcb->save.dr6    = vmcb->save.dr6;
2132         nested_vmcb->save.cpl    = vmcb->save.cpl;
2133
2134         nested_vmcb->control.int_ctl           = vmcb->control.int_ctl;
2135         nested_vmcb->control.int_vector        = vmcb->control.int_vector;
2136         nested_vmcb->control.int_state         = vmcb->control.int_state;
2137         nested_vmcb->control.exit_code         = vmcb->control.exit_code;
2138         nested_vmcb->control.exit_code_hi      = vmcb->control.exit_code_hi;
2139         nested_vmcb->control.exit_info_1       = vmcb->control.exit_info_1;
2140         nested_vmcb->control.exit_info_2       = vmcb->control.exit_info_2;
2141         nested_vmcb->control.exit_int_info     = vmcb->control.exit_int_info;
2142         nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
2143         nested_vmcb->control.next_rip          = vmcb->control.next_rip;
2144
2145         /*
2146          * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
2147          * to make sure that we do not lose injected events. So check event_inj
2148          * here and copy it to exit_int_info if it is valid.
2149          * Exit_int_info and event_inj can't be both valid because the case
2150          * below only happens on a VMRUN instruction intercept which has
2151          * no valid exit_int_info set.
2152          */
2153         if (vmcb->control.event_inj & SVM_EVTINJ_VALID) {
2154                 struct vmcb_control_area *nc = &nested_vmcb->control;
2155
2156                 nc->exit_int_info     = vmcb->control.event_inj;
2157                 nc->exit_int_info_err = vmcb->control.event_inj_err;
2158         }
2159
2160         nested_vmcb->control.tlb_ctl           = 0;
2161         nested_vmcb->control.event_inj         = 0;
2162         nested_vmcb->control.event_inj_err     = 0;
2163
2164         /* We always set V_INTR_MASKING and remember the old value in hflags */
2165         if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
2166                 nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
2167
2168         /* Restore the original control entries */
2169         copy_vmcb_control_area(vmcb, hsave);
2170
2171         kvm_clear_exception_queue(&svm->vcpu);
2172         kvm_clear_interrupt_queue(&svm->vcpu);
2173
2174         svm->nested.nested_cr3 = 0;
2175
2176         /* Restore selected save entries */
2177         svm->vmcb->save.es = hsave->save.es;
2178         svm->vmcb->save.cs = hsave->save.cs;
2179         svm->vmcb->save.ss = hsave->save.ss;
2180         svm->vmcb->save.ds = hsave->save.ds;
2181         svm->vmcb->save.gdtr = hsave->save.gdtr;
2182         svm->vmcb->save.idtr = hsave->save.idtr;
2183         svm->vmcb->save.rflags = hsave->save.rflags;
2184         svm_set_efer(&svm->vcpu, hsave->save.efer);
2185         svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
2186         svm_set_cr4(&svm->vcpu, hsave->save.cr4);
2187         if (npt_enabled) {
2188                 svm->vmcb->save.cr3 = hsave->save.cr3;
2189                 svm->vcpu.arch.cr3 = hsave->save.cr3;
2190         } else {
2191                 (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
2192         }
2193         kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
2194         kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
2195         kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
2196         svm->vmcb->save.dr7 = 0;
2197         svm->vmcb->save.cpl = 0;
2198         svm->vmcb->control.exit_int_info = 0;
2199
2200         mark_all_dirty(svm->vmcb);
2201
2202         nested_svm_unmap(page);
2203
2204         nested_svm_uninit_mmu_context(&svm->vcpu);
2205         kvm_mmu_reset_context(&svm->vcpu);
2206         kvm_mmu_load(&svm->vcpu);
2207
2208         return 0;
2209 }
2210
2211 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
2212 {
2213         /*
2214          * This function merges the msr permission bitmaps of kvm and the
2215          * nested vmcb. It is omptimized in that it only merges the parts where
2216          * the kvm msr permission bitmap may contain zero bits
2217          */
2218         int i;
2219
2220         if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
2221                 return true;
2222
2223         for (i = 0; i < MSRPM_OFFSETS; i++) {
2224                 u32 value, p;
2225                 u64 offset;
2226
2227                 if (msrpm_offsets[i] == 0xffffffff)
2228                         break;
2229
2230                 p      = msrpm_offsets[i];
2231                 offset = svm->nested.vmcb_msrpm + (p * 4);
2232
2233                 if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4))
2234                         return false;
2235
2236                 svm->nested.msrpm[p] = svm->msrpm[p] | value;
2237         }
2238
2239         svm->vmcb->control.msrpm_base_pa = __pa(svm->nested.msrpm);
2240
2241         return true;
2242 }
2243
2244 static bool nested_vmcb_checks(struct vmcb *vmcb)
2245 {
2246         if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
2247                 return false;
2248
2249         if (vmcb->control.asid == 0)
2250                 return false;
2251
2252         if (vmcb->control.nested_ctl && !npt_enabled)
2253                 return false;
2254
2255         return true;
2256 }
2257
2258 static bool nested_svm_vmrun(struct vcpu_svm *svm)
2259 {
2260         struct vmcb *nested_vmcb;
2261         struct vmcb *hsave = svm->nested.hsave;
2262         struct vmcb *vmcb = svm->vmcb;
2263         struct page *page;
2264         u64 vmcb_gpa;
2265
2266         vmcb_gpa = svm->vmcb->save.rax;
2267
2268         nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2269         if (!nested_vmcb)
2270                 return false;
2271
2272         if (!nested_vmcb_checks(nested_vmcb)) {
2273                 nested_vmcb->control.exit_code    = SVM_EXIT_ERR;
2274                 nested_vmcb->control.exit_code_hi = 0;
2275                 nested_vmcb->control.exit_info_1  = 0;
2276                 nested_vmcb->control.exit_info_2  = 0;
2277
2278                 nested_svm_unmap(page);
2279
2280                 return false;
2281         }
2282
2283         trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
2284                                nested_vmcb->save.rip,
2285                                nested_vmcb->control.int_ctl,
2286                                nested_vmcb->control.event_inj,
2287                                nested_vmcb->control.nested_ctl);
2288
2289         trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
2290                                     nested_vmcb->control.intercept_cr >> 16,
2291                                     nested_vmcb->control.intercept_exceptions,
2292                                     nested_vmcb->control.intercept);
2293
2294         /* Clear internal status */
2295         kvm_clear_exception_queue(&svm->vcpu);
2296         kvm_clear_interrupt_queue(&svm->vcpu);
2297
2298         /*
2299          * Save the old vmcb, so we don't need to pick what we save, but can
2300          * restore everything when a VMEXIT occurs
2301          */
2302         hsave->save.es     = vmcb->save.es;
2303         hsave->save.cs     = vmcb->save.cs;
2304         hsave->save.ss     = vmcb->save.ss;
2305         hsave->save.ds     = vmcb->save.ds;
2306         hsave->save.gdtr   = vmcb->save.gdtr;
2307         hsave->save.idtr   = vmcb->save.idtr;
2308         hsave->save.efer   = svm->vcpu.arch.efer;
2309         hsave->save.cr0    = kvm_read_cr0(&svm->vcpu);
2310         hsave->save.cr4    = svm->vcpu.arch.cr4;
2311         hsave->save.rflags = vmcb->save.rflags;
2312         hsave->save.rip    = kvm_rip_read(&svm->vcpu);
2313         hsave->save.rsp    = vmcb->save.rsp;
2314         hsave->save.rax    = vmcb->save.rax;
2315         if (npt_enabled)
2316                 hsave->save.cr3    = vmcb->save.cr3;
2317         else
2318                 hsave->save.cr3    = kvm_read_cr3(&svm->vcpu);
2319
2320         copy_vmcb_control_area(hsave, vmcb);
2321
2322         if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
2323                 svm->vcpu.arch.hflags |= HF_HIF_MASK;
2324         else
2325                 svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
2326
2327         if (nested_vmcb->control.nested_ctl) {
2328                 kvm_mmu_unload(&svm->vcpu);
2329                 svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
2330                 nested_svm_init_mmu_context(&svm->vcpu);
2331         }
2332
2333         /* Load the nested guest state */
2334         svm->vmcb->save.es = nested_vmcb->save.es;
2335         svm->vmcb->save.cs = nested_vmcb->save.cs;
2336         svm->vmcb->save.ss = nested_vmcb->save.ss;
2337         svm->vmcb->save.ds = nested_vmcb->save.ds;
2338         svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
2339         svm->vmcb->save.idtr = nested_vmcb->save.idtr;
2340         svm->vmcb->save.rflags = nested_vmcb->save.rflags;
2341         svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
2342         svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
2343         svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
2344         if (npt_enabled) {
2345                 svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
2346                 svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
2347         } else
2348                 (void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
2349
2350         /* Guest paging mode is active - reset mmu */
2351         kvm_mmu_reset_context(&svm->vcpu);
2352
2353         svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
2354         kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
2355         kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
2356         kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
2357
2358         /* In case we don't even reach vcpu_run, the fields are not updated */
2359         svm->vmcb->save.rax = nested_vmcb->save.rax;
2360         svm->vmcb->save.rsp = nested_vmcb->save.rsp;
2361         svm->vmcb->save.rip = nested_vmcb->save.rip;
2362         svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
2363         svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
2364         svm->vmcb->save.cpl = nested_vmcb->save.cpl;
2365
2366         svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
2367         svm->nested.vmcb_iopm  = nested_vmcb->control.iopm_base_pa  & ~0x0fffULL;
2368
2369         /* cache intercepts */
2370         svm->nested.intercept_cr         = nested_vmcb->control.intercept_cr;
2371         svm->nested.intercept_dr         = nested_vmcb->control.intercept_dr;
2372         svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
2373         svm->nested.intercept            = nested_vmcb->control.intercept;
2374
2375         svm_flush_tlb(&svm->vcpu);
2376         svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
2377         if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
2378                 svm->vcpu.arch.hflags |= HF_VINTR_MASK;
2379         else
2380                 svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
2381
2382         if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
2383                 /* We only want the cr8 intercept bits of the guest */
2384                 clr_cr_intercept(svm, INTERCEPT_CR8_READ);
2385                 clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
2386         }
2387
2388         /* We don't want to see VMMCALLs from a nested guest */
2389         clr_intercept(svm, INTERCEPT_VMMCALL);
2390
2391         svm->vmcb->control.lbr_ctl = nested_vmcb->control.lbr_ctl;
2392         svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
2393         svm->vmcb->control.int_state = nested_vmcb->control.int_state;
2394         svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
2395         svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
2396         svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
2397
2398         nested_svm_unmap(page);
2399
2400         /* Enter Guest-Mode */
2401         enter_guest_mode(&svm->vcpu);
2402
2403         /*
2404          * Merge guest and host intercepts - must be called  with vcpu in
2405          * guest-mode to take affect here
2406          */
2407         recalc_intercepts(svm);
2408
2409         svm->nested.vmcb = vmcb_gpa;
2410
2411         enable_gif(svm);
2412
2413         mark_all_dirty(svm->vmcb);
2414
2415         return true;
2416 }
2417
2418 static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
2419 {
2420         to_vmcb->save.fs = from_vmcb->save.fs;
2421         to_vmcb->save.gs = from_vmcb->save.gs;
2422         to_vmcb->save.tr = from_vmcb->save.tr;
2423         to_vmcb->save.ldtr = from_vmcb->save.ldtr;
2424         to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
2425         to_vmcb->save.star = from_vmcb->save.star;
2426         to_vmcb->save.lstar = from_vmcb->save.lstar;
2427         to_vmcb->save.cstar = from_vmcb->save.cstar;
2428         to_vmcb->save.sfmask = from_vmcb->save.sfmask;
2429         to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
2430         to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
2431         to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
2432 }
2433
2434 static int vmload_interception(struct vcpu_svm *svm)
2435 {
2436         struct vmcb *nested_vmcb;
2437         struct page *page;
2438
2439         if (nested_svm_check_permissions(svm))
2440                 return 1;
2441
2442         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2443         skip_emulated_instruction(&svm->vcpu);
2444
2445         nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2446         if (!nested_vmcb)
2447                 return 1;
2448
2449         nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
2450         nested_svm_unmap(page);
2451
2452         return 1;
2453 }
2454
2455 static int vmsave_interception(struct vcpu_svm *svm)
2456 {
2457         struct vmcb *nested_vmcb;
2458         struct page *page;
2459
2460         if (nested_svm_check_permissions(svm))
2461                 return 1;
2462
2463         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2464         skip_emulated_instruction(&svm->vcpu);
2465
2466         nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2467         if (!nested_vmcb)
2468                 return 1;
2469
2470         nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
2471         nested_svm_unmap(page);
2472
2473         return 1;
2474 }
2475
2476 static int vmrun_interception(struct vcpu_svm *svm)
2477 {
2478         if (nested_svm_check_permissions(svm))
2479                 return 1;
2480
2481         /* Save rip after vmrun instruction */
2482         kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
2483
2484         if (!nested_svm_vmrun(svm))
2485                 return 1;
2486
2487         if (!nested_svm_vmrun_msrpm(svm))
2488                 goto failed;
2489
2490         return 1;
2491
2492 failed:
2493
2494         svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
2495         svm->vmcb->control.exit_code_hi = 0;
2496         svm->vmcb->control.exit_info_1  = 0;
2497         svm->vmcb->control.exit_info_2  = 0;
2498
2499         nested_svm_vmexit(svm);
2500
2501         return 1;
2502 }
2503
2504 static int stgi_interception(struct vcpu_svm *svm)
2505 {
2506         if (nested_svm_check_permissions(svm))
2507                 return 1;
2508
2509         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2510         skip_emulated_instruction(&svm->vcpu);
2511         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
2512
2513         enable_gif(svm);
2514
2515         return 1;
2516 }
2517
2518 static int clgi_interception(struct vcpu_svm *svm)
2519 {
2520         if (nested_svm_check_permissions(svm))
2521                 return 1;
2522
2523         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2524         skip_emulated_instruction(&svm->vcpu);
2525
2526         disable_gif(svm);
2527
2528         /* After a CLGI no interrupts should come */
2529         svm_clear_vintr(svm);
2530         svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
2531
2532         mark_dirty(svm->vmcb, VMCB_INTR);
2533
2534         return 1;
2535 }
2536
2537 static int invlpga_interception(struct vcpu_svm *svm)
2538 {
2539         struct kvm_vcpu *vcpu = &svm->vcpu;
2540
2541         trace_kvm_invlpga(svm->vmcb->save.rip, vcpu->arch.regs[VCPU_REGS_RCX],
2542                           vcpu->arch.regs[VCPU_REGS_RAX]);
2543
2544         /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
2545         kvm_mmu_invlpg(vcpu, vcpu->arch.regs[VCPU_REGS_RAX]);
2546
2547         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2548         skip_emulated_instruction(&svm->vcpu);
2549         return 1;
2550 }
2551
2552 static int skinit_interception(struct vcpu_svm *svm)
2553 {
2554         trace_kvm_skinit(svm->vmcb->save.rip, svm->vcpu.arch.regs[VCPU_REGS_RAX]);
2555
2556         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2557         return 1;
2558 }
2559
2560 static int xsetbv_interception(struct vcpu_svm *svm)
2561 {
2562         u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
2563         u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
2564
2565         if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
2566                 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2567                 skip_emulated_instruction(&svm->vcpu);
2568         }
2569
2570         return 1;
2571 }
2572
2573 static int invalid_op_interception(struct vcpu_svm *svm)
2574 {
2575         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2576         return 1;
2577 }
2578
2579 static int task_switch_interception(struct vcpu_svm *svm)
2580 {
2581         u16 tss_selector;
2582         int reason;
2583         int int_type = svm->vmcb->control.exit_int_info &
2584                 SVM_EXITINTINFO_TYPE_MASK;
2585         int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
2586         uint32_t type =
2587                 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
2588         uint32_t idt_v =
2589                 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
2590         bool has_error_code = false;
2591         u32 error_code = 0;
2592
2593         tss_selector = (u16)svm->vmcb->control.exit_info_1;
2594
2595         if (svm->vmcb->control.exit_info_2 &
2596             (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
2597                 reason = TASK_SWITCH_IRET;
2598         else if (svm->vmcb->control.exit_info_2 &
2599                  (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
2600                 reason = TASK_SWITCH_JMP;
2601         else if (idt_v)
2602                 reason = TASK_SWITCH_GATE;
2603         else
2604                 reason = TASK_SWITCH_CALL;
2605
2606         if (reason == TASK_SWITCH_GATE) {
2607                 switch (type) {
2608                 case SVM_EXITINTINFO_TYPE_NMI:
2609                         svm->vcpu.arch.nmi_injected = false;
2610                         break;
2611                 case SVM_EXITINTINFO_TYPE_EXEPT:
2612                         if (svm->vmcb->control.exit_info_2 &
2613                             (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
2614                                 has_error_code = true;
2615                                 error_code =
2616                                         (u32)svm->vmcb->control.exit_info_2;
2617                         }
2618                         kvm_clear_exception_queue(&svm->vcpu);
2619                         break;
2620                 case SVM_EXITINTINFO_TYPE_INTR:
2621                         kvm_clear_interrupt_queue(&svm->vcpu);
2622                         break;
2623                 default:
2624                         break;
2625                 }
2626         }
2627
2628         if (reason != TASK_SWITCH_GATE ||
2629             int_type == SVM_EXITINTINFO_TYPE_SOFT ||
2630             (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
2631              (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
2632                 skip_emulated_instruction(&svm->vcpu);
2633
2634         if (kvm_task_switch(&svm->vcpu, tss_selector, reason,
2635                                 has_error_code, error_code) == EMULATE_FAIL) {
2636                 svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2637                 svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
2638                 svm->vcpu.run->internal.ndata = 0;
2639                 return 0;
2640         }
2641         return 1;
2642 }
2643
2644 static int cpuid_interception(struct vcpu_svm *svm)
2645 {
2646         svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2647         kvm_emulate_cpuid(&svm->vcpu);
2648         return 1;
2649 }
2650
2651 static int iret_interception(struct vcpu_svm *svm)
2652 {
2653         ++svm->vcpu.stat.nmi_window_exits;
2654         clr_intercept(svm, INTERCEPT_IRET);
2655         svm->vcpu.arch.hflags |= HF_IRET_MASK;
2656         return 1;
2657 }
2658
2659 static int invlpg_interception(struct vcpu_svm *svm)
2660 {
2661         if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
2662                 return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
2663
2664         kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
2665         skip_emulated_instruction(&svm->vcpu);
2666         return 1;
2667 }
2668
2669 static int emulate_on_interception(struct vcpu_svm *svm)
2670 {
2671         return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
2672 }
2673
2674 #define CR_VALID (1ULL << 63)
2675
2676 static int cr_interception(struct vcpu_svm *svm)
2677 {
2678         int reg, cr;
2679         unsigned long val;
2680         int err;
2681
2682         if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
2683                 return emulate_on_interception(svm);
2684
2685         if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
2686                 return emulate_on_interception(svm);
2687
2688         reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
2689         cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;
2690
2691         err = 0;
2692         if (cr >= 16) { /* mov to cr */
2693                 cr -= 16;
2694                 val = kvm_register_read(&svm->vcpu, reg);
2695                 switch (cr) {
2696                 case 0:
2697                         err = kvm_set_cr0(&svm->vcpu, val);
2698                         break;
2699                 case 3:
2700                         err = kvm_set_cr3(&svm->vcpu, val);
2701                         break;
2702                 case 4:
2703                         err = kvm_set_cr4(&svm->vcpu, val);
2704                         break;
2705                 case 8:
2706                         err = kvm_set_cr8(&svm->vcpu, val);
2707                         break;
2708                 default:
2709                         WARN(1, "unhandled write to CR%d", cr);
2710                         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2711                         return 1;
2712                 }
2713         } else { /* mov from cr */
2714                 switch (cr) {
2715                 case 0:
2716                         val = kvm_read_cr0(&svm->vcpu);
2717                         break;
2718                 case 2:
2719                         val = svm->vcpu.arch.cr2;
2720                         break;
2721                 case 3:
2722                         val = kvm_read_cr3(&svm->vcpu);
2723                         break;
2724                 case 4:
2725                         val = kvm_read_cr4(&svm->vcpu);
2726                         break;
2727                 case 8:
2728                         val = kvm_get_cr8(&svm->vcpu);
2729                         break;
2730                 default:
2731                         WARN(1, "unhandled read from CR%d", cr);
2732                         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2733                         return 1;
2734                 }
2735                 kvm_register_write(&svm->vcpu, reg, val);
2736         }
2737         kvm_complete_insn_gp(&svm->vcpu, err);
2738
2739         return 1;
2740 }
2741
2742 static int cr0_write_interception(struct vcpu_svm *svm)
2743 {
2744         struct kvm_vcpu *vcpu = &svm->vcpu;
2745         int r;
2746
2747         r = cr_interception(svm);
2748
2749         if (svm->nested.vmexit_rip) {
2750                 kvm_register_write(vcpu, VCPU_REGS_RIP, svm->nested.vmexit_rip);
2751                 kvm_register_write(vcpu, VCPU_REGS_RSP, svm->nested.vmexit_rsp);
2752                 kvm_register_write(vcpu, VCPU_REGS_RAX, svm->nested.vmexit_rax);
2753                 svm->nested.vmexit_rip = 0;
2754         }
2755
2756         return r;
2757 }
2758
2759 static int dr_interception(struct vcpu_svm *svm)
2760 {
2761         int reg, dr;
2762         unsigned long val;
2763         int err;
2764
2765         if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
2766                 return emulate_on_interception(svm);
2767
2768         reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
2769         dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
2770
2771         if (dr >= 16) { /* mov to DRn */
2772                 val = kvm_register_read(&svm->vcpu, reg);
2773                 kvm_set_dr(&svm->vcpu, dr - 16, val);
2774         } else {
2775                 err = kvm_get_dr(&svm->vcpu, dr, &val);
2776                 if (!err)
2777                         kvm_register_write(&svm->vcpu, reg, val);
2778         }
2779
2780         skip_emulated_instruction(&svm->vcpu);
2781
2782         return 1;
2783 }
2784
2785 static int cr8_write_interception(struct vcpu_svm *svm)
2786 {
2787         struct kvm_run *kvm_run = svm->vcpu.run;
2788         int r;
2789
2790         u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
2791         /* instruction emulation calls kvm_set_cr8() */
2792         r = cr_interception(svm);
2793         if (irqchip_in_kernel(svm->vcpu.kvm)) {
2794                 clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
2795                 return r;
2796         }
2797         if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
2798                 return r;
2799         kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2800         return 0;
2801 }
2802
2803 static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
2804 {
2805         struct vcpu_svm *svm = to_svm(vcpu);
2806
2807         switch (ecx) {
2808         case MSR_IA32_TSC: {
2809                 struct vmcb *vmcb = get_host_vmcb(svm);
2810
2811                 *data = vmcb->control.tsc_offset + native_read_tsc();
2812                 break;
2813         }
2814         case MSR_STAR:
2815                 *data = svm->vmcb->save.star;
2816                 break;
2817 #ifdef CONFIG_X86_64
2818         case MSR_LSTAR:
2819                 *data = svm->vmcb->save.lstar;
2820                 break;
2821         case MSR_CSTAR:
2822                 *data = svm->vmcb->save.cstar;
2823                 break;
2824         case MSR_KERNEL_GS_BASE:
2825                 *data = svm->vmcb->save.kernel_gs_base;
2826                 break;
2827         case MSR_SYSCALL_MASK:
2828                 *data = svm->vmcb->save.sfmask;
2829                 break;
2830 #endif
2831         case MSR_IA32_SYSENTER_CS:
2832                 *data = svm->vmcb->save.sysenter_cs;
2833                 break;
2834         case MSR_IA32_SYSENTER_EIP:
2835                 *data = svm->sysenter_eip;
2836                 break;
2837         case MSR_IA32_SYSENTER_ESP:
2838                 *data = svm->sysenter_esp;
2839                 break;
2840         /*
2841          * Nobody will change the following 5 values in the VMCB so we can
2842          * safely return them on rdmsr. They will always be 0 until LBRV is
2843          * implemented.
2844          */
2845         case MSR_IA32_DEBUGCTLMSR:
2846                 *data = svm->vmcb->save.dbgctl;
2847                 break;
2848         case MSR_IA32_LASTBRANCHFROMIP:
2849                 *data = svm->vmcb->save.br_from;
2850                 break;
2851         case MSR_IA32_LASTBRANCHTOIP:
2852                 *data = svm->vmcb->save.br_to;
2853                 break;
2854         case MSR_IA32_LASTINTFROMIP:
2855                 *data = svm->vmcb->save.last_excp_from;
2856                 break;
2857         case MSR_IA32_LASTINTTOIP:
2858                 *data = svm->vmcb->save.last_excp_to;
2859                 break;
2860         case MSR_VM_HSAVE_PA:
2861                 *data = svm->nested.hsave_msr;
2862                 break;
2863         case MSR_VM_CR:
2864                 *data = svm->nested.vm_cr_msr;
2865                 break;
2866         case MSR_IA32_UCODE_REV:
2867                 *data = 0x01000065;
2868                 break;
2869         default:
2870                 return kvm_get_msr_common(vcpu, ecx, data);
2871         }
2872         return 0;
2873 }
2874
2875 static int rdmsr_interception(struct vcpu_svm *svm)
2876 {
2877         u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2878         u64 data;
2879
2880         if (svm_get_msr(&svm->vcpu, ecx, &data)) {
2881                 trace_kvm_msr_read_ex(ecx);
2882                 kvm_inject_gp(&svm->vcpu, 0);
2883         } else {
2884                 trace_kvm_msr_read(ecx, data);
2885
2886                 svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
2887                 svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
2888                 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2889                 skip_emulated_instruction(&svm->vcpu);
2890         }
2891         return 1;
2892 }
2893
2894 static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
2895 {
2896         struct vcpu_svm *svm = to_svm(vcpu);
2897         int svm_dis, chg_mask;
2898
2899         if (data & ~SVM_VM_CR_VALID_MASK)
2900                 return 1;
2901
2902         chg_mask = SVM_VM_CR_VALID_MASK;
2903
2904         if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
2905                 chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
2906
2907         svm->nested.vm_cr_msr &= ~chg_mask;
2908         svm->nested.vm_cr_msr |= (data & chg_mask);
2909
2910         svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
2911
2912         /* check for svm_disable while efer.svme is set */
2913         if (svm_dis && (vcpu->arch.efer & EFER_SVME))
2914                 return 1;
2915
2916         return 0;
2917 }
2918
2919 static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
2920 {
2921         struct vcpu_svm *svm = to_svm(vcpu);
2922
2923         switch (ecx) {
2924         case MSR_IA32_TSC:
2925                 kvm_write_tsc(vcpu, data);
2926                 break;
2927         case MSR_STAR:
2928                 svm->vmcb->save.star = data;
2929                 break;
2930 #ifdef CONFIG_X86_64
2931         case MSR_LSTAR:
2932                 svm->vmcb->save.lstar = data;
2933                 break;
2934         case MSR_CSTAR:
2935                 svm->vmcb->save.cstar = data;
2936                 break;
2937         case MSR_KERNEL_GS_BASE:
2938                 svm->vmcb->save.kernel_gs_base = data;
2939                 break;
2940         case MSR_SYSCALL_MASK:
2941                 svm->vmcb->save.sfmask = data;
2942                 break;
2943 #endif
2944         case MSR_IA32_SYSENTER_CS:
2945                 svm->vmcb->save.sysenter_cs = data;
2946                 break;
2947         case MSR_IA32_SYSENTER_EIP:
2948                 svm->sysenter_eip = data;
2949                 svm->vmcb->save.sysenter_eip = data;
2950                 break;
2951         case MSR_IA32_SYSENTER_ESP:
2952                 svm->sysenter_esp = data;
2953                 svm->vmcb->save.sysenter_esp = data;
2954                 break;
2955         case MSR_IA32_DEBUGCTLMSR:
2956                 if (!boot_cpu_has(X86_FEATURE_LBRV)) {
2957                         pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
2958                                         __func__, data);
2959                         break;
2960                 }
2961                 if (data & DEBUGCTL_RESERVED_BITS)
2962                         return 1;
2963
2964                 svm->vmcb->save.dbgctl = data;
2965                 mark_dirty(svm->vmcb, VMCB_LBR);
2966                 if (data & (1ULL<<0))
2967                         svm_enable_lbrv(svm);
2968                 else
2969                         svm_disable_lbrv(svm);
2970                 break;
2971         case MSR_VM_HSAVE_PA:
2972                 svm->nested.hsave_msr = data;
2973                 break;
2974         case MSR_VM_CR:
2975                 return svm_set_vm_cr(vcpu, data);
2976         case MSR_VM_IGNNE:
2977                 pr_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
2978                 break;
2979         default:
2980                 return kvm_set_msr_common(vcpu, ecx, data);
2981         }
2982         return 0;
2983 }
2984
2985 static int wrmsr_interception(struct vcpu_svm *svm)
2986 {
2987         u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2988         u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
2989                 | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2990
2991
2992         svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2993         if (svm_set_msr(&svm->vcpu, ecx, data)) {
2994                 trace_kvm_msr_write_ex(ecx, data);
2995                 kvm_inject_gp(&svm->vcpu, 0);
2996         } else {
2997                 trace_kvm_msr_write(ecx, data);
2998                 skip_emulated_instruction(&svm->vcpu);
2999         }
3000         return 1;
3001 }
3002
3003 static int msr_interception(struct vcpu_svm *svm)
3004 {
3005         if (svm->vmcb->control.exit_info_1)
3006                 return wrmsr_interception(svm);
3007         else
3008                 return rdmsr_interception(svm);
3009 }
3010
3011 static int interrupt_window_interception(struct vcpu_svm *svm)
3012 {
3013         struct kvm_run *kvm_run = svm->vcpu.run;
3014
3015         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3016         svm_clear_vintr(svm);
3017         svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
3018         mark_dirty(svm->vmcb, VMCB_INTR);
3019         /*
3020          * If the user space waits to inject interrupts, exit as soon as
3021          * possible
3022          */
3023         if (!irqchip_in_kernel(svm->vcpu.kvm) &&
3024             kvm_run->request_interrupt_window &&
3025             !kvm_cpu_has_interrupt(&svm->vcpu)) {
3026                 ++svm->vcpu.stat.irq_window_exits;
3027                 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
3028                 return 0;
3029         }
3030
3031         return 1;
3032 }
3033
3034 static int pause_interception(struct vcpu_svm *svm)
3035 {
3036         kvm_vcpu_on_spin(&(svm->vcpu));
3037         return 1;
3038 }
3039
3040 static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = {
3041         [SVM_EXIT_READ_CR0]                     = cr_interception,
3042         [SVM_EXIT_READ_CR3]                     = cr_interception,
3043         [SVM_EXIT_READ_CR4]                     = cr_interception,
3044         [SVM_EXIT_READ_CR8]                     = cr_interception,
3045         [SVM_EXIT_CR0_SEL_WRITE]                = emulate_on_interception,
3046         [SVM_EXIT_WRITE_CR0]                    = cr0_write_interception,
3047         [SVM_EXIT_WRITE_CR3]                    = cr_interception,
3048         [SVM_EXIT_WRITE_CR4]                    = cr_interception,
3049         [SVM_EXIT_WRITE_CR8]                    = cr8_write_interception,
3050         [SVM_EXIT_READ_DR0]                     = dr_interception,
3051         [SVM_EXIT_READ_DR1]                     = dr_interception,
3052         [SVM_EXIT_READ_DR2]                     = dr_interception,
3053         [SVM_EXIT_READ_DR3]                     = dr_interception,
3054         [SVM_EXIT_READ_DR4]                     = dr_interception,
3055         [SVM_EXIT_READ_DR5]                     = dr_interception,
3056         [SVM_EXIT_READ_DR6]                     = dr_interception,
3057         [SVM_EXIT_READ_DR7]                     = dr_interception,
3058         [SVM_EXIT_WRITE_DR0]                    = dr_interception,
3059         [SVM_EXIT_WRITE_DR1]                    = dr_interception,
3060         [SVM_EXIT_WRITE_DR2]                    = dr_interception,
3061         [SVM_EXIT_WRITE_DR3]                    = dr_interception,
3062         [SVM_EXIT_WRITE_DR4]                    = dr_interception,
3063         [SVM_EXIT_WRITE_DR5]                    = dr_interception,
3064         [SVM_EXIT_WRITE_DR6]                    = dr_interception,
3065         [SVM_EXIT_WRITE_DR7]                    = dr_interception,
3066         [SVM_EXIT_EXCP_BASE + DB_VECTOR]        = db_interception,
3067         [SVM_EXIT_EXCP_BASE + BP_VECTOR]        = bp_interception,
3068         [SVM_EXIT_EXCP_BASE + UD_VECTOR]        = ud_interception,
3069         [SVM_EXIT_EXCP_BASE + PF_VECTOR]        = pf_interception,
3070         [SVM_EXIT_EXCP_BASE + NM_VECTOR]        = nm_interception,
3071         [SVM_EXIT_EXCP_BASE + MC_VECTOR]        = mc_interception,
3072         [SVM_EXIT_INTR]                         = intr_interception,
3073         [SVM_EXIT_NMI]                          = nmi_interception,
3074         [SVM_EXIT_SMI]                          = nop_on_interception,
3075         [SVM_EXIT_INIT]                         = nop_on_interception,
3076         [SVM_EXIT_VINTR]                        = interrupt_window_interception,
3077         [SVM_EXIT_CPUID]                        = cpuid_interception,
3078         [SVM_EXIT_IRET]                         = iret_interception,
3079         [SVM_EXIT_INVD]                         = emulate_on_interception,
3080         [SVM_EXIT_PAUSE]                        = pause_interception,
3081         [SVM_EXIT_HLT]                          = halt_interception,
3082         [SVM_EXIT_INVLPG]                       = invlpg_interception,
3083         [SVM_EXIT_INVLPGA]                      = invlpga_interception,
3084         [SVM_EXIT_IOIO]                         = io_interception,
3085         [SVM_EXIT_MSR]                          = msr_interception,
3086         [SVM_EXIT_TASK_SWITCH]                  = task_switch_interception,
3087         [SVM_EXIT_SHUTDOWN]                     = shutdown_interception,
3088         [SVM_EXIT_VMRUN]                        = vmrun_interception,
3089         [SVM_EXIT_VMMCALL]                      = vmmcall_interception,
3090         [SVM_EXIT_VMLOAD]                       = vmload_interception,
3091         [SVM_EXIT_VMSAVE]                       = vmsave_interception,
3092         [SVM_EXIT_STGI]                         = stgi_interception,
3093         [SVM_EXIT_CLGI]                         = clgi_interception,
3094         [SVM_EXIT_SKINIT]                       = skinit_interception,
3095         [SVM_EXIT_WBINVD]                       = emulate_on_interception,
3096         [SVM_EXIT_MONITOR]                      = invalid_op_interception,
3097         [SVM_EXIT_MWAIT]                        = invalid_op_interception,
3098         [SVM_EXIT_XSETBV]                       = xsetbv_interception,
3099         [SVM_EXIT_NPF]                          = pf_interception,
3100 };
3101
3102 void dump_vmcb(struct kvm_vcpu *vcpu)
3103 {
3104         struct vcpu_svm *svm = to_svm(vcpu);
3105         struct vmcb_control_area *control = &svm->vmcb->control;
3106         struct vmcb_save_area *save = &svm->vmcb->save;
3107
3108         pr_err("VMCB Control Area:\n");
3109         pr_err("cr_read:            %04x\n", control->intercept_cr & 0xffff);
3110         pr_err("cr_write:           %04x\n", control->intercept_cr >> 16);
3111         pr_err("dr_read:            %04x\n", control->intercept_dr & 0xffff);
3112         pr_err("dr_write:           %04x\n", control->intercept_dr >> 16);
3113         pr_err("exceptions:         %08x\n", control->intercept_exceptions);
3114         pr_err("intercepts:         %016llx\n", control->intercept);
3115         pr_err("pause filter count: %d\n", control->pause_filter_count);
3116         pr_err("iopm_base_pa:       %016llx\n", control->iopm_base_pa);
3117         pr_err("msrpm_base_pa:      %016llx\n", control->msrpm_base_pa);
3118         pr_err("tsc_offset:         %016llx\n", control->tsc_offset);
3119         pr_err("asid:               %d\n", control->asid);
3120         pr_err("tlb_ctl:            %d\n", control->tlb_ctl);
3121         pr_err("int_ctl:            %08x\n", control->int_ctl);
3122         pr_err("int_vector:         %08x\n", control->int_vector);
3123         pr_err("int_state:          %08x\n", control->int_state);
3124         pr_err("exit_code:          %08x\n", control->exit_code);
3125         pr_err("exit_info1:         %016llx\n", control->exit_info_1);
3126         pr_err("exit_info2:         %016llx\n", control->exit_info_2);
3127         pr_err("exit_int_info:      %08x\n", control->exit_int_info);
3128         pr_err("exit_int_info_err:  %08x\n", control->exit_int_info_err);
3129         pr_err("nested_ctl:         %lld\n", control->nested_ctl);
3130         pr_err("nested_cr3:         %016llx\n", control->nested_cr3);
3131         pr_err("event_inj:          %08x\n", control->event_inj);
3132         pr_err("event_inj_err:      %08x\n", control->event_inj_err);
3133         pr_err("lbr_ctl:            %lld\n", control->lbr_ctl);
3134         pr_err("next_rip:           %016llx\n", control->next_rip);
3135         pr_err("VMCB State Save Area:\n");
3136         pr_err("es:   s: %04x a: %04x l: %08x b: %016llx\n",
3137                 save->es.selector, save->es.attrib,
3138                 save->es.limit, save->es.base);
3139         pr_err("cs:   s: %04x a: %04x l: %08x b: %016llx\n",
3140                 save->cs.selector, save->cs.attrib,
3141                 save->cs.limit, save->cs.base);
3142         pr_err("ss:   s: %04x a: %04x l: %08x b: %016llx\n",
3143                 save->ss.selector, save->ss.attrib,
3144                 save->ss.limit, save->ss.base);
3145         pr_err("ds:   s: %04x a: %04x l: %08x b: %016llx\n",
3146                 save->ds.selector, save->ds.attrib,
3147                 save->ds.limit, save->ds.base);
3148         pr_err("fs:   s: %04x a: %04x l: %08x b: %016llx\n",
3149                 save->fs.selector, save->fs.attrib,
3150                 save->fs.limit, save->fs.base);
3151         pr_err("gs:   s: %04x a: %04x l: %08x b: %016llx\n",
3152                 save->gs.selector, save->gs.attrib,
3153                 save->gs.limit, save->gs.base);
3154         pr_err("gdtr: s: %04x a: %04x l: %08x b: %016llx\n",
3155                 save->gdtr.selector, save->gdtr.attrib,
3156                 save->gdtr.limit, save->gdtr.base);
3157         pr_err("ldtr: s: %04x a: %04x l: %08x b: %016llx\n",
3158                 save->ldtr.selector, save->ldtr.attrib,
3159                 save->ldtr.limit, save->ldtr.base);
3160         pr_err("idtr: s: %04x a: %04x l: %08x b: %016llx\n",
3161                 save->idtr.selector, save->idtr.attrib,
3162                 save->idtr.limit, save->idtr.base);
3163         pr_err("tr:   s: %04x a: %04x l: %08x b: %016llx\n",
3164                 save->tr.selector, save->tr.attrib,
3165                 save->tr.limit, save->tr.base);
3166         pr_err("cpl:            %d                efer:         %016llx\n",
3167                 save->cpl, save->efer);
3168         pr_err("cr0:            %016llx cr2:          %016llx\n",
3169                 save->cr0, save->cr2);
3170         pr_err("cr3:            %016llx cr4:          %016llx\n",
3171                 save->cr3, save->cr4);
3172         pr_err("dr6:            %016llx dr7:          %016llx\n",
3173                 save->dr6, save->dr7);
3174         pr_err("rip:            %016llx rflags:       %016llx\n",
3175                 save->rip, save->rflags);
3176         pr_err("rsp:            %016llx rax:          %016llx\n",
3177                 save->rsp, save->rax);
3178         pr_err("star:           %016llx lstar:        %016llx\n",
3179                 save->star, save->lstar);
3180         pr_err("cstar:          %016llx sfmask:       %016llx\n",
3181                 save->cstar, save->sfmask);
3182         pr_err("kernel_gs_base: %016llx sysenter_cs:  %016llx\n",
3183                 save->kernel_gs_base, save->sysenter_cs);
3184         pr_err("sysenter_esp:   %016llx sysenter_eip: %016llx\n",
3185                 save->sysenter_esp, save->sysenter_eip);
3186         pr_err("gpat:           %016llx dbgctl:       %016llx\n",
3187                 save->g_pat, save->dbgctl);
3188         pr_err("br_from:        %016llx br_to:        %016llx\n",
3189                 save->br_from, save->br_to);
3190         pr_err("excp_from:      %016llx excp_to:      %016llx\n",
3191                 save->last_excp_from, save->last_excp_to);
3192
3193 }
3194
3195 static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
3196 {
3197         struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
3198
3199         *info1 = control->exit_info_1;
3200         *info2 = control->exit_info_2;
3201 }
3202
3203 static int handle_exit(struct kvm_vcpu *vcpu)
3204 {
3205         struct vcpu_svm *svm = to_svm(vcpu);
3206         struct kvm_run *kvm_run = vcpu->run;
3207         u32 exit_code = svm->vmcb->control.exit_code;
3208
3209         trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
3210
3211         if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
3212                 vcpu->arch.cr0 = svm->vmcb->save.cr0;
3213         if (npt_enabled)
3214                 vcpu->arch.cr3 = svm->vmcb->save.cr3;
3215
3216         if (unlikely(svm->nested.exit_required)) {
3217                 nested_svm_vmexit(svm);
3218                 svm->nested.exit_required = false;
3219
3220                 return 1;
3221         }
3222
3223         if (is_guest_mode(vcpu)) {
3224                 int vmexit;
3225
3226                 trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
3227                                         svm->vmcb->control.exit_info_1,
3228                                         svm->vmcb->control.exit_info_2,
3229                                         svm->vmcb->control.exit_int_info,
3230                                         svm->vmcb->control.exit_int_info_err);
3231
3232                 vmexit = nested_svm_exit_special(svm);
3233
3234                 if (vmexit == NESTED_EXIT_CONTINUE)
3235                         vmexit = nested_svm_exit_handled(svm);
3236
3237                 if (vmexit == NESTED_EXIT_DONE)
3238                         return 1;
3239         }
3240
3241         svm_complete_interrupts(svm);
3242
3243         if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
3244                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3245                 kvm_run->fail_entry.hardware_entry_failure_reason
3246                         = svm->vmcb->control.exit_code;
3247                 pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
3248                 dump_vmcb(vcpu);
3249                 return 0;
3250         }
3251
3252         if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
3253             exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
3254             exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
3255             exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
3256                 printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
3257                        "exit_code 0x%x\n",
3258                        __func__, svm->vmcb->control.exit_int_info,
3259                        exit_code);
3260
3261         if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
3262             || !svm_exit_handlers[exit_code]) {
3263                 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3264                 kvm_run->hw.hardware_exit_reason = exit_code;
3265                 return 0;
3266         }
3267
3268         return svm_exit_handlers[exit_code](svm);
3269 }
3270
3271 static void reload_tss(struct kvm_vcpu *vcpu)
3272 {
3273         int cpu = raw_smp_processor_id();
3274
3275         struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
3276         sd->tss_desc->type = 9; /* available 32/64-bit TSS */
3277         load_TR_desc();
3278 }
3279
3280 static void pre_svm_run(struct vcpu_svm *svm)
3281 {
3282         int cpu = raw_smp_processor_id();
3283
3284         struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
3285
3286         /* FIXME: handle wraparound of asid_generation */
3287         if (svm->asid_generation != sd->asid_generation)
3288                 new_asid(svm, sd);
3289 }
3290
3291 static void svm_inject_nmi(struct kvm_vcpu *vcpu)
3292 {
3293         struct vcpu_svm *svm = to_svm(vcpu);
3294
3295         svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
3296         vcpu->arch.hflags |= HF_NMI_MASK;
3297         set_intercept(svm, INTERCEPT_IRET);
3298         ++vcpu->stat.nmi_injections;
3299 }
3300
3301 static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
3302 {
3303         struct vmcb_control_area *control;
3304
3305         control = &svm->vmcb->control;
3306         control->int_vector = irq;
3307         control->int_ctl &= ~V_INTR_PRIO_MASK;
3308         control->int_ctl |= V_IRQ_MASK |
3309                 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
3310         mark_dirty(svm->vmcb, VMCB_INTR);
3311 }
3312
3313 static void svm_set_irq(struct kvm_vcpu *vcpu)
3314 {
3315         struct vcpu_svm *svm = to_svm(vcpu);
3316
3317         BUG_ON(!(gif_set(svm)));
3318
3319         trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
3320         ++vcpu->stat.irq_injections;
3321
3322         svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
3323                 SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
3324 }
3325
3326 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3327 {
3328         struct vcpu_svm *svm = to_svm(vcpu);
3329
3330         if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
3331                 return;
3332
3333         if (irr == -1)
3334                 return;
3335
3336         if (tpr >= irr)
3337                 set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
3338 }
3339
3340 static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
3341 {
3342         struct vcpu_svm *svm = to_svm(vcpu);
3343         struct vmcb *vmcb = svm->vmcb;
3344         int ret;
3345         ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
3346               !(svm->vcpu.arch.hflags & HF_NMI_MASK);
3347         ret = ret && gif_set(svm) && nested_svm_nmi(svm);
3348
3349         return ret;
3350 }
3351
3352 static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
3353 {
3354         struct vcpu_svm *svm = to_svm(vcpu);
3355
3356         return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
3357 }
3358
3359 static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
3360 {
3361         struct vcpu_svm *svm = to_svm(vcpu);
3362
3363         if (masked) {
3364                 svm->vcpu.arch.hflags |= HF_NMI_MASK;
3365                 set_intercept(svm, INTERCEPT_IRET);
3366         } else {
3367                 svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
3368                 clr_intercept(svm, INTERCEPT_IRET);
3369         }
3370 }
3371
3372 static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
3373 {
3374         struct vcpu_svm *svm = to_svm(vcpu);
3375         struct vmcb *vmcb = svm->vmcb;
3376         int ret;
3377
3378         if (!gif_set(svm) ||
3379              (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
3380                 return 0;
3381
3382         ret = !!(vmcb->save.rflags & X86_EFLAGS_IF);
3383
3384         if (is_guest_mode(vcpu))
3385                 return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);
3386
3387         return ret;
3388 }
3389
3390 static void enable_irq_window(struct kvm_vcpu *vcpu)
3391 {
3392         struct vcpu_svm *svm = to_svm(vcpu);
3393
3394         /*
3395          * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
3396          * 1, because that's a separate STGI/VMRUN intercept.  The next time we
3397          * get that intercept, this function will be called again though and
3398          * we'll get the vintr intercept.
3399          */
3400         if (gif_set(svm) && nested_svm_intr(svm)) {
3401                 svm_set_vintr(svm);
3402                 svm_inject_irq(svm, 0x0);
3403         }
3404 }
3405
3406 static void enable_nmi_window(struct kvm_vcpu *vcpu)
3407 {
3408         struct vcpu_svm *svm = to_svm(vcpu);
3409
3410         if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
3411             == HF_NMI_MASK)
3412                 return; /* IRET will cause a vm exit */
3413
3414         /*
3415          * Something prevents NMI from been injected. Single step over possible
3416          * problem (IRET or exception injection or interrupt shadow)
3417          */
3418         svm->nmi_singlestep = true;
3419         svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
3420         update_db_intercept(vcpu);
3421 }
3422
3423 static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
3424 {
3425         return 0;
3426 }
3427
3428 static void svm_flush_tlb(struct kvm_vcpu *vcpu)
3429 {
3430         struct vcpu_svm *svm = to_svm(vcpu);
3431
3432         if (static_cpu_has(X86_FEATURE_FLUSHBYASID))
3433                 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
3434         else
3435                 svm->asid_generation--;
3436 }
3437
3438 static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
3439 {
3440 }
3441
3442 static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
3443 {
3444         struct vcpu_svm *svm = to_svm(vcpu);
3445
3446         if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
3447                 return;
3448
3449         if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
3450                 int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
3451                 kvm_set_cr8(vcpu, cr8);
3452         }
3453 }
3454
3455 static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
3456 {
3457         struct vcpu_svm *svm = to_svm(vcpu);
3458         u64 cr8;
3459
3460         if (is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK))
3461                 return;
3462
3463         cr8 = kvm_get_cr8(vcpu);
3464         svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
3465         svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
3466 }
3467
3468 static void svm_complete_interrupts(struct vcpu_svm *svm)
3469 {
3470         u8 vector;
3471         int type;
3472         u32 exitintinfo = svm->vmcb->control.exit_int_info;
3473         unsigned int3_injected = svm->int3_injected;
3474
3475         svm->int3_injected = 0;
3476
3477         if (svm->vcpu.arch.hflags & HF_IRET_MASK) {
3478                 svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
3479                 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3480         }
3481
3482         svm->vcpu.arch.nmi_injected = false;
3483         kvm_clear_exception_queue(&svm->vcpu);
3484         kvm_clear_interrupt_queue(&svm->vcpu);
3485
3486         if (!(exitintinfo & SVM_EXITINTINFO_VALID))
3487                 return;
3488
3489         kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3490
3491         vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
3492         type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
3493
3494         switch (type) {
3495         case SVM_EXITINTINFO_TYPE_NMI:
3496                 svm->vcpu.arch.nmi_injected = true;
3497                 break;
3498         case SVM_EXITINTINFO_TYPE_EXEPT:
3499                 /*
3500                  * In case of software exceptions, do not reinject the vector,
3501                  * but re-execute the instruction instead. Rewind RIP first
3502                  * if we emulated INT3 before.
3503                  */
3504                 if (kvm_exception_is_soft(vector)) {
3505                         if (vector == BP_VECTOR && int3_injected &&
3506                             kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
3507                                 kvm_rip_write(&svm->vcpu,
3508                                               kvm_rip_read(&svm->vcpu) -
3509                                               int3_injected);
3510                         break;
3511                 }
3512                 if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
3513                         u32 err = svm->vmcb->control.exit_int_info_err;
3514                         kvm_requeue_exception_e(&svm->vcpu, vector, err);
3515
3516                 } else
3517                         kvm_requeue_exception(&svm->vcpu, vector);
3518                 break;
3519         case SVM_EXITINTINFO_TYPE_INTR:
3520                 kvm_queue_interrupt(&svm->vcpu, vector, false);
3521                 break;
3522         default:
3523                 break;
3524         }
3525 }
3526
3527 static void svm_cancel_injection(struct kvm_vcpu *vcpu)
3528 {
3529         struct vcpu_svm *svm = to_svm(vcpu);
3530         struct vmcb_control_area *control = &svm->vmcb->control;
3531
3532         control->exit_int_info = control->event_inj;
3533         control->exit_int_info_err = control->event_inj_err;
3534         control->event_inj = 0;
3535         svm_complete_interrupts(svm);
3536 }
3537
3538 #ifdef CONFIG_X86_64
3539 #define R "r"
3540 #else
3541 #define R "e"
3542 #endif
3543
3544 static void svm_vcpu_run(struct kvm_vcpu *vcpu)
3545 {
3546         struct vcpu_svm *svm = to_svm(vcpu);
3547
3548         svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
3549         svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
3550         svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
3551
3552         /*
3553          * A vmexit emulation is required before the vcpu can be executed
3554          * again.
3555          */
3556         if (unlikely(svm->nested.exit_required))
3557                 return;
3558
3559         pre_svm_run(svm);
3560
3561         sync_lapic_to_cr8(vcpu);
3562
3563         svm->vmcb->save.cr2 = vcpu->arch.cr2;
3564
3565         clgi();
3566
3567         local_irq_enable();
3568
3569         asm volatile (
3570                 "push %%"R"bp; \n\t"
3571                 "mov %c[rbx](%[svm]), %%"R"bx \n\t"
3572                 "mov %c[rcx](%[svm]), %%"R"cx \n\t"
3573                 "mov %c[rdx](%[svm]), %%"R"dx \n\t"
3574                 "mov %c[rsi](%[svm]), %%"R"si \n\t"
3575                 "mov %c[rdi](%[svm]), %%"R"di \n\t"
3576                 "mov %c[rbp](%[svm]), %%"R"bp \n\t"
3577 #ifdef CONFIG_X86_64
3578                 "mov %c[r8](%[svm]),  %%r8  \n\t"
3579                 "mov %c[r9](%[svm]),  %%r9  \n\t"
3580                 "mov %c[r10](%[svm]), %%r10 \n\t"
3581                 "mov %c[r11](%[svm]), %%r11 \n\t"
3582                 "mov %c[r12](%[svm]), %%r12 \n\t"
3583                 "mov %c[r13](%[svm]), %%r13 \n\t"
3584                 "mov %c[r14](%[svm]), %%r14 \n\t"
3585                 "mov %c[r15](%[svm]), %%r15 \n\t"
3586 #endif
3587
3588                 /* Enter guest mode */
3589                 "push %%"R"ax \n\t"
3590                 "mov %c[vmcb](%[svm]), %%"R"ax \n\t"
3591                 __ex(SVM_VMLOAD) "\n\t"
3592                 __ex(SVM_VMRUN) "\n\t"
3593                 __ex(SVM_VMSAVE) "\n\t"
3594                 "pop %%"R"ax \n\t"
3595
3596                 /* Save guest registers, load host registers */
3597                 "mov %%"R"bx, %c[rbx](%[svm]) \n\t"
3598                 "mov %%"R"cx, %c[rcx](%[svm]) \n\t"
3599                 "mov %%"R"dx, %c[rdx](%[svm]) \n\t"
3600                 "mov %%"R"si, %c[rsi](%[svm]) \n\t"
3601                 "mov %%"R"di, %c[rdi](%[svm]) \n\t"
3602                 "mov %%"R"bp, %c[rbp](%[svm]) \n\t"
3603 #ifdef CONFIG_X86_64
3604                 "mov %%r8,  %c[r8](%[svm]) \n\t"
3605                 "mov %%r9,  %c[r9](%[svm]) \n\t"
3606                 "mov %%r10, %c[r10](%[svm]) \n\t"
3607                 "mov %%r11, %c[r11](%[svm]) \n\t"
3608                 "mov %%r12, %c[r12](%[svm]) \n\t"
3609                 "mov %%r13, %c[r13](%[svm]) \n\t"
3610                 "mov %%r14, %c[r14](%[svm]) \n\t"
3611                 "mov %%r15, %c[r15](%[svm]) \n\t"
3612 #endif
3613                 "pop %%"R"bp"
3614                 :
3615                 : [svm]"a"(svm),
3616                   [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
3617                   [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
3618                   [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
3619                   [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
3620                   [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
3621                   [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
3622                   [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
3623 #ifdef CONFIG_X86_64
3624                   , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
3625                   [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
3626                   [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
3627                   [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
3628                   [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
3629                   [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
3630                   [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
3631                   [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
3632 #endif
3633                 : "cc", "memory"
3634                 , R"bx", R"cx", R"dx", R"si", R"di"
3635 #ifdef CONFIG_X86_64
3636                 , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
3637 #endif
3638                 );
3639
3640 #ifdef CONFIG_X86_64
3641         wrmsrl(MSR_GS_BASE, svm->host.gs_base);
3642 #else
3643         loadsegment(fs, svm->host.fs);
3644 #endif
3645
3646         reload_tss(vcpu);
3647
3648         local_irq_disable();
3649
3650         stgi();
3651
3652         vcpu->arch.cr2 = svm->vmcb->save.cr2;
3653         vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
3654         vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
3655         vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
3656
3657         sync_cr8_to_lapic(vcpu);
3658
3659         svm->next_rip = 0;
3660
3661         svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
3662
3663         /* if exit due to PF check for async PF */
3664         if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
3665                 svm->apf_reason = kvm_read_and_reset_pf_reason();
3666
3667         if (npt_enabled) {
3668                 vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
3669                 vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
3670         }
3671
3672         /*
3673          * We need to handle MC intercepts here before the vcpu has a chance to
3674          * change the physical cpu
3675          */
3676         if (unlikely(svm->vmcb->control.exit_code ==
3677                      SVM_EXIT_EXCP_BASE + MC_VECTOR))
3678                 svm_handle_mce(svm);
3679
3680         mark_all_clean(svm->vmcb);
3681 }
3682
3683 #undef R
3684
3685 static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
3686 {
3687         struct vcpu_svm *svm = to_svm(vcpu);
3688
3689         svm->vmcb->save.cr3 = root;
3690         mark_dirty(svm->vmcb, VMCB_CR);
3691         svm_flush_tlb(vcpu);
3692 }
3693
3694 static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
3695 {
3696         struct vcpu_svm *svm = to_svm(vcpu);
3697
3698         svm->vmcb->control.nested_cr3 = root;
3699         mark_dirty(svm->vmcb, VMCB_NPT);
3700
3701         /* Also sync guest cr3 here in case we live migrate */
3702         svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
3703         mark_dirty(svm->vmcb, VMCB_CR);
3704
3705         svm_flush_tlb(vcpu);
3706 }
3707
3708 static int is_disabled(void)
3709 {
3710         u64 vm_cr;
3711
3712         rdmsrl(MSR_VM_CR, vm_cr);
3713         if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
3714                 return 1;
3715
3716         return 0;
3717 }
3718
3719 static void
3720 svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
3721 {
3722         /*
3723          * Patch in the VMMCALL instruction:
3724          */
3725         hypercall[0] = 0x0f;
3726         hypercall[1] = 0x01;
3727         hypercall[2] = 0xd9;
3728 }
3729
3730 static void svm_check_processor_compat(void *rtn)
3731 {
3732         *(int *)rtn = 0;
3733 }
3734
3735 static bool svm_cpu_has_accelerated_tpr(void)
3736 {
3737         return false;
3738 }
3739
3740 static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
3741 {
3742         return 0;
3743 }
3744
3745 static void svm_cpuid_update(struct kvm_vcpu *vcpu)
3746 {
3747 }
3748
3749 static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
3750 {
3751         switch (func) {
3752         case 0x80000001:
3753                 if (nested)
3754                         entry->ecx |= (1 << 2); /* Set SVM bit */
3755                 break;
3756         case 0x8000000A:
3757                 entry->eax = 1; /* SVM revision 1 */
3758                 entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
3759                                    ASID emulation to nested SVM */
3760                 entry->ecx = 0; /* Reserved */
3761                 entry->edx = 0; /* Per default do not support any
3762                                    additional features */
3763
3764                 /* Support next_rip if host supports it */
3765                 if (boot_cpu_has(X86_FEATURE_NRIPS))
3766                         entry->edx |= SVM_FEATURE_NRIP;
3767
3768                 /* Support NPT for the guest if enabled */
3769                 if (npt_enabled)
3770                         entry->edx |= SVM_FEATURE_NPT;
3771
3772                 break;
3773         }
3774 }
3775
3776 static const struct trace_print_flags svm_exit_reasons_str[] = {
3777         { SVM_EXIT_READ_CR0,                    "read_cr0" },
3778         { SVM_EXIT_READ_CR3,                    "read_cr3" },
3779         { SVM_EXIT_READ_CR4,                    "read_cr4" },
3780         { SVM_EXIT_READ_CR8,                    "read_cr8" },
3781         { SVM_EXIT_WRITE_CR0,                   "write_cr0" },
3782         { SVM_EXIT_WRITE_CR3,                   "write_cr3" },
3783         { SVM_EXIT_WRITE_CR4,                   "write_cr4" },
3784         { SVM_EXIT_WRITE_CR8,                   "write_cr8" },
3785         { SVM_EXIT_READ_DR0,                    "read_dr0" },
3786         { SVM_EXIT_READ_DR1,                    "read_dr1" },
3787         { SVM_EXIT_READ_DR2,                    "read_dr2" },
3788         { SVM_EXIT_READ_DR3,                    "read_dr3" },
3789         { SVM_EXIT_WRITE_DR0,                   "write_dr0" },
3790         { SVM_EXIT_WRITE_DR1,                   "write_dr1" },
3791         { SVM_EXIT_WRITE_DR2,                   "write_dr2" },
3792         { SVM_EXIT_WRITE_DR3,                   "write_dr3" },
3793         { SVM_EXIT_WRITE_DR5,                   "write_dr5" },
3794         { SVM_EXIT_WRITE_DR7,                   "write_dr7" },
3795         { SVM_EXIT_EXCP_BASE + DB_VECTOR,       "DB excp" },
3796         { SVM_EXIT_EXCP_BASE + BP_VECTOR,       "BP excp" },
3797         { SVM_EXIT_EXCP_BASE + UD_VECTOR,       "UD excp" },
3798         { SVM_EXIT_EXCP_BASE + PF_VECTOR,       "PF excp" },
3799         { SVM_EXIT_EXCP_BASE + NM_VECTOR,       "NM excp" },
3800         { SVM_EXIT_EXCP_BASE + MC_VECTOR,       "MC excp" },
3801         { SVM_EXIT_INTR,                        "interrupt" },
3802         { SVM_EXIT_NMI,                         "nmi" },
3803         { SVM_EXIT_SMI,                         "smi" },
3804         { SVM_EXIT_INIT,                        "init" },
3805         { SVM_EXIT_VINTR,                       "vintr" },
3806         { SVM_EXIT_CPUID,                       "cpuid" },
3807         { SVM_EXIT_INVD,                        "invd" },
3808         { SVM_EXIT_HLT,                         "hlt" },
3809         { SVM_EXIT_INVLPG,                      "invlpg" },
3810         { SVM_EXIT_INVLPGA,                     "invlpga" },
3811         { SVM_EXIT_IOIO,                        "io" },
3812         { SVM_EXIT_MSR,                         "msr" },
3813         { SVM_EXIT_TASK_SWITCH,                 "task_switch" },
3814         { SVM_EXIT_SHUTDOWN,                    "shutdown" },
3815         { SVM_EXIT_VMRUN,                       "vmrun" },
3816         { SVM_EXIT_VMMCALL,                     "hypercall" },
3817         { SVM_EXIT_VMLOAD,                      "vmload" },
3818         { SVM_EXIT_VMSAVE,                      "vmsave" },
3819         { SVM_EXIT_STGI,                        "stgi" },
3820         { SVM_EXIT_CLGI,                        "clgi" },
3821         { SVM_EXIT_SKINIT,                      "skinit" },
3822         { SVM_EXIT_WBINVD,                      "wbinvd" },
3823         { SVM_EXIT_MONITOR,                     "monitor" },
3824         { SVM_EXIT_MWAIT,                       "mwait" },
3825         { SVM_EXIT_XSETBV,                      "xsetbv" },
3826         { SVM_EXIT_NPF,                         "npf" },
3827         { -1, NULL }
3828 };
3829
3830 static int svm_get_lpage_level(void)
3831 {
3832         return PT_PDPE_LEVEL;
3833 }
3834
3835 static bool svm_rdtscp_supported(void)
3836 {
3837         return false;
3838 }
3839
3840 static bool svm_has_wbinvd_exit(void)
3841 {
3842         return true;
3843 }
3844
3845 static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
3846 {
3847         struct vcpu_svm *svm = to_svm(vcpu);
3848
3849         set_exception_intercept(svm, NM_VECTOR);
3850         update_cr0_intercept(svm);
3851 }
3852
3853 static struct kvm_x86_ops svm_x86_ops = {
3854         .cpu_has_kvm_support = has_svm,
3855         .disabled_by_bios = is_disabled,
3856         .hardware_setup = svm_hardware_setup,
3857         .hardware_unsetup = svm_hardware_unsetup,
3858         .check_processor_compatibility = svm_check_processor_compat,
3859         .hardware_enable = svm_hardware_enable,
3860         .hardware_disable = svm_hardware_disable,
3861         .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
3862
3863         .vcpu_create = svm_create_vcpu,
3864         .vcpu_free = svm_free_vcpu,
3865         .vcpu_reset = svm_vcpu_reset,
3866
3867         .prepare_guest_switch = svm_prepare_guest_switch,
3868         .vcpu_load = svm_vcpu_load,
3869         .vcpu_put = svm_vcpu_put,
3870
3871         .set_guest_debug = svm_guest_debug,
3872         .get_msr = svm_get_msr,
3873         .set_msr = svm_set_msr,
3874         .get_segment_base = svm_get_segment_base,
3875         .get_segment = svm_get_segment,
3876         .set_segment = svm_set_segment,
3877         .get_cpl = svm_get_cpl,
3878         .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
3879         .decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
3880         .decache_cr3 = svm_decache_cr3,
3881         .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
3882         .set_cr0 = svm_set_cr0,
3883         .set_cr3 = svm_set_cr3,
3884         .set_cr4 = svm_set_cr4,
3885         .set_efer = svm_set_efer,
3886         .get_idt = svm_get_idt,
3887         .set_idt = svm_set_idt,
3888         .get_gdt = svm_get_gdt,
3889         .set_gdt = svm_set_gdt,
3890         .set_dr7 = svm_set_dr7,
3891         .cache_reg = svm_cache_reg,
3892         .get_rflags = svm_get_rflags,
3893         .set_rflags = svm_set_rflags,
3894         .fpu_activate = svm_fpu_activate,
3895         .fpu_deactivate = svm_fpu_deactivate,
3896
3897         .tlb_flush = svm_flush_tlb,
3898
3899         .run = svm_vcpu_run,
3900         .handle_exit = handle_exit,
3901         .skip_emulated_instruction = skip_emulated_instruction,
3902         .set_interrupt_shadow = svm_set_interrupt_shadow,
3903         .get_interrupt_shadow = svm_get_interrupt_shadow,
3904         .patch_hypercall = svm_patch_hypercall,
3905         .set_irq = svm_set_irq,
3906         .set_nmi = svm_inject_nmi,
3907         .queue_exception = svm_queue_exception,
3908         .cancel_injection = svm_cancel_injection,
3909         .interrupt_allowed = svm_interrupt_allowed,
3910         .nmi_allowed = svm_nmi_allowed,
3911         .get_nmi_mask = svm_get_nmi_mask,
3912         .set_nmi_mask = svm_set_nmi_mask,
3913         .enable_nmi_window = enable_nmi_window,
3914         .enable_irq_window = enable_irq_window,
3915         .update_cr8_intercept = update_cr8_intercept,
3916
3917         .set_tss_addr = svm_set_tss_addr,
3918         .get_tdp_level = get_npt_level,
3919         .get_mt_mask = svm_get_mt_mask,
3920
3921         .get_exit_info = svm_get_exit_info,
3922         .exit_reasons_str = svm_exit_reasons_str,
3923
3924         .get_lpage_level = svm_get_lpage_level,
3925
3926         .cpuid_update = svm_cpuid_update,
3927
3928         .rdtscp_supported = svm_rdtscp_supported,
3929
3930         .set_supported_cpuid = svm_set_supported_cpuid,
3931
3932         .has_wbinvd_exit = svm_has_wbinvd_exit,
3933
3934         .write_tsc_offset = svm_write_tsc_offset,
3935         .adjust_tsc_offset = svm_adjust_tsc_offset,
3936
3937         .set_tdp_cr3 = set_tdp_cr3,
3938 };
3939
3940 static int __init svm_init(void)
3941 {
3942         return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
3943                         __alignof__(struct vcpu_svm), THIS_MODULE);
3944 }
3945
3946 static void __exit svm_exit(void)
3947 {
3948         kvm_exit();
3949 }
3950
3951 module_init(svm_init)
3952 module_exit(svm_exit)