drivers/kvm/x86.h

   1 #/*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This header defines architecture specific interfaces, x86 version
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #ifndef KVM_X86_H
  12 #define KVM_X86_H
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16
  17 #include <linux/kvm.h>
  18 #include <linux/kvm_para.h>
  19
  20 #include <asm/desc.h>
  21
  22 #include "types.h"
  23
  24 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  25 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  26 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS|0xFFFFFF0000000000ULL)
  27
  28 #define KVM_GUEST_CR0_MASK \
  29         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  30          | X86_CR0_NW | X86_CR0_CD)
  31 #define KVM_VM_CR0_ALWAYS_ON \
  32         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  33          | X86_CR0_MP)
  34 #define KVM_GUEST_CR4_MASK \
  35         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  36 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  37 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  38
  39 #define INVALID_PAGE (~(hpa_t)0)
  40 #define UNMAPPED_GVA (~(gpa_t)0)
  41
  42 #define DE_VECTOR 0
  43 #define UD_VECTOR 6
  44 #define NM_VECTOR 7
  45 #define DF_VECTOR 8
  46 #define TS_VECTOR 10
  47 #define NP_VECTOR 11
  48 #define SS_VECTOR 12
  49 #define GP_VECTOR 13
  50 #define PF_VECTOR 14
  51
  52 #define SELECTOR_TI_MASK (1 << 2)
  53 #define SELECTOR_RPL_MASK 0x03
  54
  55 #define IOPL_SHIFT 12
  56
  57 #define KVM_PERMILLE_MMU_PAGES 20
  58 #define KVM_MIN_ALLOC_MMU_PAGES 64
  59 #define KVM_NUM_MMU_PAGES 1024
  60 #define KVM_MIN_FREE_MMU_PAGES 5
  61 #define KVM_REFILL_PAGES 25
  62 #define KVM_MAX_CPUID_ENTRIES 40
  63
  64 extern spinlock_t kvm_lock;
  65 extern struct list_head vm_list;
  66
  67 struct kvm_vcpu;
  68 struct kvm;
  69
  70 enum {
  71         VCPU_REGS_RAX = 0,
  72         VCPU_REGS_RCX = 1,
  73         VCPU_REGS_RDX = 2,
  74         VCPU_REGS_RBX = 3,
  75         VCPU_REGS_RSP = 4,
  76         VCPU_REGS_RBP = 5,
  77         VCPU_REGS_RSI = 6,
  78         VCPU_REGS_RDI = 7,
  79 #ifdef CONFIG_X86_64
  80         VCPU_REGS_R8 = 8,
  81         VCPU_REGS_R9 = 9,
  82         VCPU_REGS_R10 = 10,
  83         VCPU_REGS_R11 = 11,
  84         VCPU_REGS_R12 = 12,
  85         VCPU_REGS_R13 = 13,
  86         VCPU_REGS_R14 = 14,
  87         VCPU_REGS_R15 = 15,
  88 #endif
  89         NR_VCPU_REGS
  90 };
  91
  92 enum {
  93         VCPU_SREG_CS,
  94         VCPU_SREG_DS,
  95         VCPU_SREG_ES,
  96         VCPU_SREG_FS,
  97         VCPU_SREG_GS,
  98         VCPU_SREG_SS,
  99         VCPU_SREG_TR,
 100         VCPU_SREG_LDTR,
 101 };
 102
 103 #include "x86_emulate.h"
 104
 105 #define KVM_NR_MEM_OBJS 40
 106
 107 /*
 108  * We don't want allocation failures within the mmu code, so we preallocate
 109  * enough memory for a single page fault in a cache.
 110  */
 111 struct kvm_mmu_memory_cache {
 112         int nobjs;
 113         void *objects[KVM_NR_MEM_OBJS];
 114 };
 115
 116 #define NR_PTE_CHAIN_ENTRIES 5
 117
 118 struct kvm_pte_chain {
 119         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 120         struct hlist_node link;
 121 };
 122
 123 /*
 124  * kvm_mmu_page_role, below, is defined as:
 125  *
 126  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 127  *   bits 4:7 - page table level for this shadow (1-4)
 128  *   bits 8:9 - page table quadrant for 2-level guests
 129  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 130  *   bits 17:19 - common access permissions for all ptes in this shadow page
 131  */
 132 union kvm_mmu_page_role {
 133         unsigned word;
 134         struct {
 135                 unsigned glevels : 4;
 136                 unsigned level : 4;
 137                 unsigned quadrant : 2;
 138                 unsigned pad_for_nice_hex_output : 6;
 139                 unsigned metaphysical : 1;
 140                 unsigned access : 3;
 141         };
 142 };
 143
 144 struct kvm_mmu_page {
 145         struct list_head link;
 146         struct hlist_node hash_link;
 147
 148         /*
 149          * The following two entries are used to key the shadow page in the
 150          * hash table.
 151          */
 152         gfn_t gfn;
 153         union kvm_mmu_page_role role;
 154
 155         u64 *spt;
 156         /* hold the gfn of each spte inside spt */
 157         gfn_t *gfns;
 158         unsigned long slot_bitmap; /* One bit set per slot which has memory
 159                                     * in this shadow page.
 160                                     */
 161         int multimapped;         /* More than one parent_pte? */
 162         int root_count;          /* Currently serving as active root */
 163         union {
 164                 u64 *parent_pte;               /* !multimapped */
 165                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 166         };
 167 };
 168
 169 /*
 170  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 171  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 172  * mode.
 173  */
 174 struct kvm_mmu {
 175         void (*new_cr3)(struct kvm_vcpu *vcpu);
 176         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 177         void (*free)(struct kvm_vcpu *vcpu);
 178         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 179         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 180                               struct kvm_mmu_page *page);
 181         hpa_t root_hpa;
 182         int root_level;
 183         int shadow_root_level;
 184
 185         u64 *pae_root;
 186 };
 187
 188 struct kvm_vcpu_arch {
 189         u64 host_tsc;
 190         int interrupt_window_open;
 191         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 192         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 193         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 194         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 195
 196         unsigned long cr0;
 197         unsigned long cr2;
 198         unsigned long cr3;
 199         unsigned long cr4;
 200         unsigned long cr8;
 201         u64 pdptrs[4]; /* pae */
 202         u64 shadow_efer;
 203         u64 apic_base;
 204         struct kvm_lapic *apic;    /* kernel irqchip context */
 205 #define VCPU_MP_STATE_RUNNABLE          0
 206 #define VCPU_MP_STATE_UNINITIALIZED     1
 207 #define VCPU_MP_STATE_INIT_RECEIVED     2
 208 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 209 #define VCPU_MP_STATE_HALTED            4
 210         int mp_state;
 211         int sipi_vector;
 212         u64 ia32_misc_enable_msr;
 213
 214         struct kvm_mmu mmu;
 215
 216         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 217         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 218         struct kvm_mmu_memory_cache mmu_page_cache;
 219         struct kvm_mmu_memory_cache mmu_page_header_cache;
 220
 221         gfn_t last_pt_write_gfn;
 222         int   last_pt_write_count;
 223         u64  *last_pte_updated;
 224
 225         struct i387_fxsave_struct host_fx_image;
 226         struct i387_fxsave_struct guest_fx_image;
 227
 228         gva_t mmio_fault_cr2;
 229         struct kvm_pio_request pio;
 230         void *pio_data;
 231
 232         struct kvm_queued_exception {
 233                 bool pending;
 234                 bool has_error_code;
 235                 u8 nr;
 236                 u32 error_code;
 237         } exception;
 238
 239         struct {
 240                 int active;
 241                 u8 save_iopl;
 242                 struct kvm_save_segment {
 243                         u16 selector;
 244                         unsigned long base;
 245                         u32 limit;
 246                         u32 ar;
 247                 } tr, es, ds, fs, gs;
 248         } rmode;
 249         int halt_request; /* real mode on Intel only */
 250
 251         int cpuid_nent;
 252         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 253         /* emulate context */
 254
 255         struct x86_emulate_ctxt emulate_ctxt;
 256 };
 257
 258
 259 struct descriptor_table {
 260         u16 limit;
 261         unsigned long base;
 262 } __attribute__((packed));
 263
 264 struct kvm_x86_ops {
 265         int (*cpu_has_kvm_support)(void);          /* __init */
 266         int (*disabled_by_bios)(void);             /* __init */
 267         void (*hardware_enable)(void *dummy);      /* __init */
 268         void (*hardware_disable)(void *dummy);
 269         void (*check_processor_compatibility)(void *rtn);
 270         int (*hardware_setup)(void);               /* __init */
 271         void (*hardware_unsetup)(void);            /* __exit */
 272
 273         /* Create, but do not attach this VCPU */
 274         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 275         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 276         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 277
 278         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 279         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 280         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 281         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 282
 283         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 284                                struct kvm_debug_guest *dbg);
 285         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 286         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 287         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 288         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 289         void (*get_segment)(struct kvm_vcpu *vcpu,
 290                             struct kvm_segment *var, int seg);
 291         void (*set_segment)(struct kvm_vcpu *vcpu,
 292                             struct kvm_segment *var, int seg);
 293         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 294         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 295         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 296         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 297         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 298         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 299         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 300         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 301         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 302         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 303         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 304         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 305                        int *exception);
 306         void (*cache_regs)(struct kvm_vcpu *vcpu);
 307         void (*decache_regs)(struct kvm_vcpu *vcpu);
 308         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 309         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 310
 311         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 312
 313         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 314         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 315         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 316         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 317                                 unsigned char *hypercall_addr);
 318         int (*get_irq)(struct kvm_vcpu *vcpu);
 319         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 320         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 321                                 bool has_error_code, u32 error_code);
 322         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 323         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 324         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 325                                        struct kvm_run *run);
 326
 327         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 328 };
 329
 330 extern struct kvm_x86_ops *kvm_x86_ops;
 331
 332 int kvm_mmu_module_init(void);
 333 void kvm_mmu_module_exit(void);
 334
 335 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 336 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 337 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 338 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 339
 340 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 341 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 342 void kvm_mmu_zap_all(struct kvm *kvm);
 343 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 344 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 345
 346 enum emulation_result {
 347         EMULATE_DONE,       /* no further processing */
 348         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 349         EMULATE_FAIL,         /* can't emulate this instruction */
 350 };
 351
 352 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 353                         unsigned long cr2, u16 error_code, int no_decode);
 354 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 355 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 356 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 357 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 358                    unsigned long *rflags);
 359
 360 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 361 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 362                      unsigned long *rflags);
 363 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 364 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 365
 366 struct x86_emulate_ctxt;
 367
 368 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 369                      int size, unsigned port);
 370 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 371                            int size, unsigned long count, int down,
 372                             gva_t address, int rep, unsigned port);
 373 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 374 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 375 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 376 int emulate_clts(struct kvm_vcpu *vcpu);
 377 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 378                     unsigned long *dest);
 379 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 380                     unsigned long value);
 381
 382 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 383 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 384 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 385 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 386 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 387 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 388 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 389
 390 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 391 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 392
 393 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 394 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 395 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 396                            u32 error_code);
 397
 398 void fx_init(struct kvm_vcpu *vcpu);
 399
 400 int emulator_read_std(unsigned long addr,
 401                       void *val,
 402                       unsigned int bytes,
 403                       struct kvm_vcpu *vcpu);
 404 int emulator_write_emulated(unsigned long addr,
 405                             const void *val,
 406                             unsigned int bytes,
 407                             struct kvm_vcpu *vcpu);
 408
 409 unsigned long segment_base(u16 selector);
 410
 411 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 412 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 413                        const u8 *new, int bytes);
 414 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 415 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 416 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 417 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 418
 419 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 420
 421 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 422
 423 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 424
 425 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 426 int complete_pio(struct kvm_vcpu *vcpu);
 427
 428 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 429 {
 430         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 431
 432         return (struct kvm_mmu_page *)page_private(page);
 433 }
 434
 435 static inline u16 read_fs(void)
 436 {
 437         u16 seg;
 438         asm("mov %%fs, %0" : "=g"(seg));
 439         return seg;
 440 }
 441
 442 static inline u16 read_gs(void)
 443 {
 444         u16 seg;
 445         asm("mov %%gs, %0" : "=g"(seg));
 446         return seg;
 447 }
 448
 449 static inline u16 read_ldt(void)
 450 {
 451         u16 ldt;
 452         asm("sldt %0" : "=g"(ldt));
 453         return ldt;
 454 }
 455
 456 static inline void load_fs(u16 sel)
 457 {
 458         asm("mov %0, %%fs" : : "rm"(sel));
 459 }
 460
 461 static inline void load_gs(u16 sel)
 462 {
 463         asm("mov %0, %%gs" : : "rm"(sel));
 464 }
 465
 466 #ifndef load_ldt
 467 static inline void load_ldt(u16 sel)
 468 {
 469         asm("lldt %0" : : "rm"(sel));
 470 }
 471 #endif
 472
 473 static inline void get_idt(struct descriptor_table *table)
 474 {
 475         asm("sidt %0" : "=m"(*table));
 476 }
 477
 478 static inline void get_gdt(struct descriptor_table *table)
 479 {
 480         asm("sgdt %0" : "=m"(*table));
 481 }
 482
 483 static inline unsigned long read_tr_base(void)
 484 {
 485         u16 tr;
 486         asm("str %0" : "=g"(tr));
 487         return segment_base(tr);
 488 }
 489
 490 #ifdef CONFIG_X86_64
 491 static inline unsigned long read_msr(unsigned long msr)
 492 {
 493         u64 value;
 494
 495         rdmsrl(msr, value);
 496         return value;
 497 }
 498 #endif
 499
 500 static inline void fx_save(struct i387_fxsave_struct *image)
 501 {
 502         asm("fxsave (%0)":: "r" (image));
 503 }
 504
 505 static inline void fx_restore(struct i387_fxsave_struct *image)
 506 {
 507         asm("fxrstor (%0)":: "r" (image));
 508 }
 509
 510 static inline void fpu_init(void)
 511 {
 512         asm("finit");
 513 }
 514
 515 static inline u32 get_rdx_init_val(void)
 516 {
 517         return 0x600; /* P6 family */
 518 }
 519
 520 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 521 {
 522         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 523 }
 524
 525 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 526 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 527 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 528 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 529 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 530 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 531 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 532 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 533 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 534
 535 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 536
 537 #define TSS_IOPB_BASE_OFFSET 0x66
 538 #define TSS_BASE_SIZE 0x68
 539 #define TSS_IOPB_SIZE (65536 / 8)
 540 #define TSS_REDIRECTION_SIZE (256 / 8)
 541 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 542
 543 #endif