drivers/kvm/kvm.h

   1 #ifndef __KVM_H
   2 #define __KVM_H
   3
   4 /*
   5  * This work is licensed under the terms of the GNU GPL, version 2.  See
   6  * the COPYING file in the top-level directory.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/list.h>
  11 #include <linux/mutex.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/mm.h>
  14
  15 #include "vmx.h"
  16 #include <linux/kvm.h>
  17 #include <linux/kvm_para.h>
  18
  19 #define CR0_PE_MASK (1ULL << 0)
  20 #define CR0_TS_MASK (1ULL << 3)
  21 #define CR0_NE_MASK (1ULL << 5)
  22 #define CR0_WP_MASK (1ULL << 16)
  23 #define CR0_NW_MASK (1ULL << 29)
  24 #define CR0_CD_MASK (1ULL << 30)
  25 #define CR0_PG_MASK (1ULL << 31)
  26
  27 #define CR3_WPT_MASK (1ULL << 3)
  28 #define CR3_PCD_MASK (1ULL << 4)
  29
  30 #define CR3_RESEVED_BITS 0x07ULL
  31 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
  32 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)
  33
  34 #define CR4_VME_MASK (1ULL << 0)
  35 #define CR4_PSE_MASK (1ULL << 4)
  36 #define CR4_PAE_MASK (1ULL << 5)
  37 #define CR4_PGE_MASK (1ULL << 7)
  38 #define CR4_VMXE_MASK (1ULL << 13)
  39
  40 #define KVM_GUEST_CR0_MASK \
  41         (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
  42          | CR0_NW_MASK | CR0_CD_MASK)
  43 #define KVM_VM_CR0_ALWAYS_ON \
  44         (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
  45 #define KVM_GUEST_CR4_MASK \
  46         (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
  47 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
  48 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
  49
  50 #define INVALID_PAGE (~(hpa_t)0)
  51 #define UNMAPPED_GVA (~(gpa_t)0)
  52
  53 #define KVM_MAX_VCPUS 1
  54 #define KVM_MEMORY_SLOTS 4
  55 #define KVM_NUM_MMU_PAGES 256
  56 #define KVM_MIN_FREE_MMU_PAGES 5
  57 #define KVM_REFILL_PAGES 25
  58 #define KVM_MAX_CPUID_ENTRIES 40
  59
  60 #define FX_IMAGE_SIZE 512
  61 #define FX_IMAGE_ALIGN 16
  62 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
  63
  64 #define DE_VECTOR 0
  65 #define DF_VECTOR 8
  66 #define TS_VECTOR 10
  67 #define NP_VECTOR 11
  68 #define SS_VECTOR 12
  69 #define GP_VECTOR 13
  70 #define PF_VECTOR 14
  71
  72 #define SELECTOR_TI_MASK (1 << 2)
  73 #define SELECTOR_RPL_MASK 0x03
  74
  75 #define IOPL_SHIFT 12
  76
  77 #define KVM_PIO_PAGE_OFFSET 1
  78
  79 /*
  80  * Address types:
  81  *
  82  *  gva - guest virtual address
  83  *  gpa - guest physical address
  84  *  gfn - guest frame number
  85  *  hva - host virtual address
  86  *  hpa - host physical address
  87  *  hfn - host frame number
  88  */
  89
  90 typedef unsigned long  gva_t;
  91 typedef u64            gpa_t;
  92 typedef unsigned long  gfn_t;
  93
  94 typedef unsigned long  hva_t;
  95 typedef u64            hpa_t;
  96 typedef unsigned long  hfn_t;
  97
  98 #define NR_PTE_CHAIN_ENTRIES 5
  99
 100 struct kvm_pte_chain {
 101         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 102         struct hlist_node link;
 103 };
 104
 105 /*
 106  * kvm_mmu_page_role, below, is defined as:
 107  *
 108  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 109  *   bits 4:7 - page table level for this shadow (1-4)
 110  *   bits 8:9 - page table quadrant for 2-level guests
 111  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 112  */
 113 union kvm_mmu_page_role {
 114         unsigned word;
 115         struct {
 116                 unsigned glevels : 4;
 117                 unsigned level : 4;
 118                 unsigned quadrant : 2;
 119                 unsigned pad_for_nice_hex_output : 6;
 120                 unsigned metaphysical : 1;
 121         };
 122 };
 123
 124 struct kvm_mmu_page {
 125         struct list_head link;
 126         struct hlist_node hash_link;
 127
 128         /*
 129          * The following two entries are used to key the shadow page in the
 130          * hash table.
 131          */
 132         gfn_t gfn;
 133         union kvm_mmu_page_role role;
 134
 135         hpa_t page_hpa;
 136         unsigned long slot_bitmap; /* One bit set per slot which has memory
 137                                     * in this shadow page.
 138                                     */
 139         int global;              /* Set if all ptes in this page are global */
 140         int multimapped;         /* More than one parent_pte? */
 141         int root_count;          /* Currently serving as active root */
 142         union {
 143                 u64 *parent_pte;               /* !multimapped */
 144                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 145         };
 146 };
 147
 148 struct vmcs {
 149         u32 revision_id;
 150         u32 abort;
 151         char data[0];
 152 };
 153
 154 #define vmx_msr_entry kvm_msr_entry
 155
 156 struct kvm_vcpu;
 157
 158 /*
 159  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 160  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 161  * mode.
 162  */
 163 struct kvm_mmu {
 164         void (*new_cr3)(struct kvm_vcpu *vcpu);
 165         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 166         void (*free)(struct kvm_vcpu *vcpu);
 167         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 168         hpa_t root_hpa;
 169         int root_level;
 170         int shadow_root_level;
 171
 172         u64 *pae_root;
 173 };
 174
 175 #define KVM_NR_MEM_OBJS 20
 176
 177 struct kvm_mmu_memory_cache {
 178         int nobjs;
 179         void *objects[KVM_NR_MEM_OBJS];
 180 };
 181
 182 /*
 183  * We don't want allocation failures within the mmu code, so we preallocate
 184  * enough memory for a single page fault in a cache.
 185  */
 186 struct kvm_guest_debug {
 187         int enabled;
 188         unsigned long bp[4];
 189         int singlestep;
 190 };
 191
 192 enum {
 193         VCPU_REGS_RAX = 0,
 194         VCPU_REGS_RCX = 1,
 195         VCPU_REGS_RDX = 2,
 196         VCPU_REGS_RBX = 3,
 197         VCPU_REGS_RSP = 4,
 198         VCPU_REGS_RBP = 5,
 199         VCPU_REGS_RSI = 6,
 200         VCPU_REGS_RDI = 7,
 201 #ifdef CONFIG_X86_64
 202         VCPU_REGS_R8 = 8,
 203         VCPU_REGS_R9 = 9,
 204         VCPU_REGS_R10 = 10,
 205         VCPU_REGS_R11 = 11,
 206         VCPU_REGS_R12 = 12,
 207         VCPU_REGS_R13 = 13,
 208         VCPU_REGS_R14 = 14,
 209         VCPU_REGS_R15 = 15,
 210 #endif
 211         NR_VCPU_REGS
 212 };
 213
 214 enum {
 215         VCPU_SREG_CS,
 216         VCPU_SREG_DS,
 217         VCPU_SREG_ES,
 218         VCPU_SREG_FS,
 219         VCPU_SREG_GS,
 220         VCPU_SREG_SS,
 221         VCPU_SREG_TR,
 222         VCPU_SREG_LDTR,
 223 };
 224
 225 struct kvm_pio_request {
 226         unsigned long count;
 227         int cur_count;
 228         struct page *guest_pages[2];
 229         unsigned guest_page_offset;
 230         int in;
 231         int size;
 232         int string;
 233         int down;
 234         int rep;
 235 };
 236
 237 struct kvm_vcpu {
 238         struct kvm *kvm;
 239         union {
 240                 struct vmcs *vmcs;
 241                 struct vcpu_svm *svm;
 242         };
 243         struct mutex mutex;
 244         int   cpu;
 245         int   launched;
 246         struct kvm_run *run;
 247         int interrupt_window_open;
 248         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 249 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
 250         unsigned long irq_pending[NR_IRQ_WORDS];
 251         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 252         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 253
 254         unsigned long cr0;
 255         unsigned long cr2;
 256         unsigned long cr3;
 257         gpa_t para_state_gpa;
 258         struct page *para_state_page;
 259         gpa_t hypercall_gpa;
 260         unsigned long cr4;
 261         unsigned long cr8;
 262         u64 pdptrs[4]; /* pae */
 263         u64 shadow_efer;
 264         u64 apic_base;
 265         u64 ia32_misc_enable_msr;
 266         int nmsrs;
 267         struct vmx_msr_entry *guest_msrs;
 268         struct vmx_msr_entry *host_msrs;
 269
 270         struct list_head free_pages;
 271         struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
 272         struct kvm_mmu mmu;
 273
 274         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 275         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 276
 277         gfn_t last_pt_write_gfn;
 278         int   last_pt_write_count;
 279
 280         struct kvm_guest_debug guest_debug;
 281
 282         char fx_buf[FX_BUF_SIZE];
 283         char *host_fx_image;
 284         char *guest_fx_image;
 285
 286         int mmio_needed;
 287         int mmio_read_completed;
 288         int mmio_is_write;
 289         int mmio_size;
 290         unsigned char mmio_data[8];
 291         gpa_t mmio_phys_addr;
 292         struct kvm_pio_request pio;
 293         void *pio_data;
 294
 295         int sigset_active;
 296         sigset_t sigset;
 297
 298         struct {
 299                 int active;
 300                 u8 save_iopl;
 301                 struct kvm_save_segment {
 302                         u16 selector;
 303                         unsigned long base;
 304                         u32 limit;
 305                         u32 ar;
 306                 } tr, es, ds, fs, gs;
 307         } rmode;
 308
 309         int cpuid_nent;
 310         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 311 };
 312
 313 struct kvm_memory_slot {
 314         gfn_t base_gfn;
 315         unsigned long npages;
 316         unsigned long flags;
 317         struct page **phys_mem;
 318         unsigned long *dirty_bitmap;
 319 };
 320
 321 struct kvm {
 322         spinlock_t lock; /* protects everything except vcpus */
 323         int nmemslots;
 324         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 325         /*
 326          * Hash table of struct kvm_mmu_page.
 327          */
 328         struct list_head active_mmu_pages;
 329         int n_free_mmu_pages;
 330         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 331         struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 332         int memory_config_version;
 333         int busy;
 334         unsigned long rmap_overflow;
 335         struct list_head vm_list;
 336         struct file *filp;
 337 };
 338
 339 struct kvm_stat {
 340         u32 pf_fixed;
 341         u32 pf_guest;
 342         u32 tlb_flush;
 343         u32 invlpg;
 344
 345         u32 exits;
 346         u32 io_exits;
 347         u32 mmio_exits;
 348         u32 signal_exits;
 349         u32 irq_window_exits;
 350         u32 halt_exits;
 351         u32 request_irq_exits;
 352         u32 irq_exits;
 353 };
 354
 355 struct descriptor_table {
 356         u16 limit;
 357         unsigned long base;
 358 } __attribute__((packed));
 359
 360 struct kvm_arch_ops {
 361         int (*cpu_has_kvm_support)(void);          /* __init */
 362         int (*disabled_by_bios)(void);             /* __init */
 363         void (*hardware_enable)(void *dummy);      /* __init */
 364         void (*hardware_disable)(void *dummy);
 365         int (*hardware_setup)(void);               /* __init */
 366         void (*hardware_unsetup)(void);            /* __exit */
 367
 368         int (*vcpu_create)(struct kvm_vcpu *vcpu);
 369         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 370
 371         void (*vcpu_load)(struct kvm_vcpu *vcpu);
 372         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 373         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 374
 375         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 376                                struct kvm_debug_guest *dbg);
 377         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 378         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 379         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 380         void (*get_segment)(struct kvm_vcpu *vcpu,
 381                             struct kvm_segment *var, int seg);
 382         void (*set_segment)(struct kvm_vcpu *vcpu,
 383                             struct kvm_segment *var, int seg);
 384         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 385         void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 386         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 387         void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
 388                                       unsigned long cr0);
 389         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 390         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 391         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 392         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 393         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 394         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 395         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 396         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 397         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 398                        int *exception);
 399         void (*cache_regs)(struct kvm_vcpu *vcpu);
 400         void (*decache_regs)(struct kvm_vcpu *vcpu);
 401         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 402         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 403
 404         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 405         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 406         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 407                                   unsigned long addr, u32 err_code);
 408
 409         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 410
 411         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 412         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 413         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 414         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 415                                 unsigned char *hypercall_addr);
 416 };
 417
 418 extern struct kvm_stat kvm_stat;
 419 extern struct kvm_arch_ops *kvm_arch_ops;
 420
 421 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 422 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 423
 424 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 425 void kvm_exit_arch(void);
 426
 427 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 428 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 429 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 430
 431 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 432 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
 433
 434 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 435 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 436 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 437 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 438 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 439 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 440
 441 void kvm_emulator_want_group7_invlpg(void);
 442
 443 extern hpa_t bad_page_address;
 444
 445 static inline struct page *gfn_to_page(struct kvm_memory_slot *slot, gfn_t gfn)
 446 {
 447         return slot->phys_mem[gfn - slot->base_gfn];
 448 }
 449
 450 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 451 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 452
 453 enum emulation_result {
 454         EMULATE_DONE,       /* no further processing */
 455         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 456         EMULATE_FAIL,         /* can't emulate this instruction */
 457 };
 458
 459 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 460                         unsigned long cr2, u16 error_code);
 461 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 462 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 463 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 464                    unsigned long *rflags);
 465
 466 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 467 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 468                      unsigned long *rflags);
 469
 470 struct x86_emulate_ctxt;
 471
 472 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 473                   int size, unsigned long count, int string, int down,
 474                   gva_t address, int rep, unsigned port);
 475 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 476 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 477 int emulate_clts(struct kvm_vcpu *vcpu);
 478 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 479                     unsigned long *dest);
 480 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 481                     unsigned long value);
 482
 483 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 484 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 485 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 486 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 487 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 488
 489 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 490 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 491
 492 void fx_init(struct kvm_vcpu *vcpu);
 493
 494 void load_msrs(struct vmx_msr_entry *e, int n);
 495 void save_msrs(struct vmx_msr_entry *e, int n);
 496 void kvm_resched(struct kvm_vcpu *vcpu);
 497
 498 int kvm_read_guest(struct kvm_vcpu *vcpu,
 499                gva_t addr,
 500                unsigned long size,
 501                void *dest);
 502
 503 int kvm_write_guest(struct kvm_vcpu *vcpu,
 504                 gva_t addr,
 505                 unsigned long size,
 506                 void *data);
 507
 508 unsigned long segment_base(u16 selector);
 509
 510 void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 511 void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 512 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 513 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 514
 515 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 516
 517 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 518                                      u32 error_code)
 519 {
 520         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 521                 kvm_mmu_free_some_pages(vcpu);
 522         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 523 }
 524
 525 static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
 526 {
 527         struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
 528         return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
 529 }
 530
 531 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 532 {
 533 #ifdef CONFIG_X86_64
 534         return vcpu->shadow_efer & EFER_LME;
 535 #else
 536         return 0;
 537 #endif
 538 }
 539
 540 static inline int is_pae(struct kvm_vcpu *vcpu)
 541 {
 542         return vcpu->cr4 & CR4_PAE_MASK;
 543 }
 544
 545 static inline int is_pse(struct kvm_vcpu *vcpu)
 546 {
 547         return vcpu->cr4 & CR4_PSE_MASK;
 548 }
 549
 550 static inline int is_paging(struct kvm_vcpu *vcpu)
 551 {
 552         return vcpu->cr0 & CR0_PG_MASK;
 553 }
 554
 555 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 556 {
 557         return slot - kvm->memslots;
 558 }
 559
 560 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 561 {
 562         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 563
 564         return (struct kvm_mmu_page *)page_private(page);
 565 }
 566
 567 static inline u16 read_fs(void)
 568 {
 569         u16 seg;
 570         asm ("mov %%fs, %0" : "=g"(seg));
 571         return seg;
 572 }
 573
 574 static inline u16 read_gs(void)
 575 {
 576         u16 seg;
 577         asm ("mov %%gs, %0" : "=g"(seg));
 578         return seg;
 579 }
 580
 581 static inline u16 read_ldt(void)
 582 {
 583         u16 ldt;
 584         asm ("sldt %0" : "=g"(ldt));
 585         return ldt;
 586 }
 587
 588 static inline void load_fs(u16 sel)
 589 {
 590         asm ("mov %0, %%fs" : : "rm"(sel));
 591 }
 592
 593 static inline void load_gs(u16 sel)
 594 {
 595         asm ("mov %0, %%gs" : : "rm"(sel));
 596 }
 597
 598 #ifndef load_ldt
 599 static inline void load_ldt(u16 sel)
 600 {
 601         asm ("lldt %0" : : "rm"(sel));
 602 }
 603 #endif
 604
 605 static inline void get_idt(struct descriptor_table *table)
 606 {
 607         asm ("sidt %0" : "=m"(*table));
 608 }
 609
 610 static inline void get_gdt(struct descriptor_table *table)
 611 {
 612         asm ("sgdt %0" : "=m"(*table));
 613 }
 614
 615 static inline unsigned long read_tr_base(void)
 616 {
 617         u16 tr;
 618         asm ("str %0" : "=g"(tr));
 619         return segment_base(tr);
 620 }
 621
 622 #ifdef CONFIG_X86_64
 623 static inline unsigned long read_msr(unsigned long msr)
 624 {
 625         u64 value;
 626
 627         rdmsrl(msr, value);
 628         return value;
 629 }
 630 #endif
 631
 632 static inline void fx_save(void *image)
 633 {
 634         asm ("fxsave (%0)":: "r" (image));
 635 }
 636
 637 static inline void fx_restore(void *image)
 638 {
 639         asm ("fxrstor (%0)":: "r" (image));
 640 }
 641
 642 static inline void fpu_init(void)
 643 {
 644         asm ("finit");
 645 }
 646
 647 static inline u32 get_rdx_init_val(void)
 648 {
 649         return 0x600; /* P6 family */
 650 }
 651
 652 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 653 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 654 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 655 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 656 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 657 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 658 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 659 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 660 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 661
 662 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 663
 664 #define TSS_IOPB_BASE_OFFSET 0x66
 665 #define TSS_BASE_SIZE 0x68
 666 #define TSS_IOPB_SIZE (65536 / 8)
 667 #define TSS_REDIRECTION_SIZE (256 / 8)
 668 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 669
 670 #endif