include/asm-x86/kvm_host.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 ASM_KVM_HOST_H
  12 #define ASM_KVM_HOST_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 #include <linux/kvm_types.h>
  20
  21 #include <asm/desc.h>
  22
  23 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  24 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  25 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |    \
  26                                   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_ALIAS_SLOTS 4
  58
  59 #define KVM_PERMILLE_MMU_PAGES 20
  60 #define KVM_MIN_ALLOC_MMU_PAGES 64
  61 #define KVM_NUM_MMU_PAGES 1024
  62 #define KVM_MIN_FREE_MMU_PAGES 5
  63 #define KVM_REFILL_PAGES 25
  64 #define KVM_MAX_CPUID_ENTRIES 40
  65
  66 extern spinlock_t kvm_lock;
  67 extern struct list_head vm_list;
  68
  69 struct kvm_vcpu;
  70 struct kvm;
  71
  72 enum {
  73         VCPU_REGS_RAX = 0,
  74         VCPU_REGS_RCX = 1,
  75         VCPU_REGS_RDX = 2,
  76         VCPU_REGS_RBX = 3,
  77         VCPU_REGS_RSP = 4,
  78         VCPU_REGS_RBP = 5,
  79         VCPU_REGS_RSI = 6,
  80         VCPU_REGS_RDI = 7,
  81 #ifdef CONFIG_X86_64
  82         VCPU_REGS_R8 = 8,
  83         VCPU_REGS_R9 = 9,
  84         VCPU_REGS_R10 = 10,
  85         VCPU_REGS_R11 = 11,
  86         VCPU_REGS_R12 = 12,
  87         VCPU_REGS_R13 = 13,
  88         VCPU_REGS_R14 = 14,
  89         VCPU_REGS_R15 = 15,
  90 #endif
  91         NR_VCPU_REGS
  92 };
  93
  94 enum {
  95         VCPU_SREG_CS,
  96         VCPU_SREG_DS,
  97         VCPU_SREG_ES,
  98         VCPU_SREG_FS,
  99         VCPU_SREG_GS,
 100         VCPU_SREG_SS,
 101         VCPU_SREG_TR,
 102         VCPU_SREG_LDTR,
 103 };
 104
 105 #include <asm/kvm_x86_emulate.h>
 106
 107 #define KVM_NR_MEM_OBJS 40
 108
 109 /*
 110  * We don't want allocation failures within the mmu code, so we preallocate
 111  * enough memory for a single page fault in a cache.
 112  */
 113 struct kvm_mmu_memory_cache {
 114         int nobjs;
 115         void *objects[KVM_NR_MEM_OBJS];
 116 };
 117
 118 #define NR_PTE_CHAIN_ENTRIES 5
 119
 120 struct kvm_pte_chain {
 121         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 122         struct hlist_node link;
 123 };
 124
 125 /*
 126  * kvm_mmu_page_role, below, is defined as:
 127  *
 128  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 129  *   bits 4:7 - page table level for this shadow (1-4)
 130  *   bits 8:9 - page table quadrant for 2-level guests
 131  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 132  *   bits 17:19 - common access permissions for all ptes in this shadow page
 133  */
 134 union kvm_mmu_page_role {
 135         unsigned word;
 136         struct {
 137                 unsigned glevels:4;
 138                 unsigned level:4;
 139                 unsigned quadrant:2;
 140                 unsigned pad_for_nice_hex_output:6;
 141                 unsigned metaphysical:1;
 142                 unsigned access:3;
 143         };
 144 };
 145
 146 struct kvm_mmu_page {
 147         struct list_head link;
 148         struct hlist_node hash_link;
 149
 150         /*
 151          * The following two entries are used to key the shadow page in the
 152          * hash table.
 153          */
 154         gfn_t gfn;
 155         union kvm_mmu_page_role role;
 156
 157         u64 *spt;
 158         /* hold the gfn of each spte inside spt */
 159         gfn_t *gfns;
 160         unsigned long slot_bitmap; /* One bit set per slot which has memory
 161                                     * in this shadow page.
 162                                     */
 163         int multimapped;         /* More than one parent_pte? */
 164         int root_count;          /* Currently serving as active root */
 165         union {
 166                 u64 *parent_pte;               /* !multimapped */
 167                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 168         };
 169 };
 170
 171 /*
 172  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 173  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 174  * mode.
 175  */
 176 struct kvm_mmu {
 177         void (*new_cr3)(struct kvm_vcpu *vcpu);
 178         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 179         void (*free)(struct kvm_vcpu *vcpu);
 180         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 181         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 182                               struct kvm_mmu_page *page);
 183         hpa_t root_hpa;
 184         int root_level;
 185         int shadow_root_level;
 186
 187         u64 *pae_root;
 188 };
 189
 190 struct kvm_vcpu_arch {
 191         u64 host_tsc;
 192         int interrupt_window_open;
 193         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 194         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 195         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 196         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 197
 198         unsigned long cr0;
 199         unsigned long cr2;
 200         unsigned long cr3;
 201         unsigned long cr4;
 202         unsigned long cr8;
 203         u64 pdptrs[4]; /* pae */
 204         u64 shadow_efer;
 205         u64 apic_base;
 206         struct kvm_lapic *apic;    /* kernel irqchip context */
 207 #define VCPU_MP_STATE_RUNNABLE          0
 208 #define VCPU_MP_STATE_UNINITIALIZED     1
 209 #define VCPU_MP_STATE_INIT_RECEIVED     2
 210 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 211 #define VCPU_MP_STATE_HALTED            4
 212         int mp_state;
 213         int sipi_vector;
 214         u64 ia32_misc_enable_msr;
 215         bool tpr_access_reporting;
 216
 217         struct kvm_mmu mmu;
 218
 219         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 220         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 221         struct kvm_mmu_memory_cache mmu_page_cache;
 222         struct kvm_mmu_memory_cache mmu_page_header_cache;
 223
 224         gfn_t last_pt_write_gfn;
 225         int   last_pt_write_count;
 226         u64  *last_pte_updated;
 227
 228         struct {
 229                 gfn_t gfn;          /* presumed gfn during guest pte update */
 230                 struct page *page;  /* page corresponding to that gfn */
 231         } update_pte;
 232
 233         struct i387_fxsave_struct host_fx_image;
 234         struct i387_fxsave_struct guest_fx_image;
 235
 236         gva_t mmio_fault_cr2;
 237         struct kvm_pio_request pio;
 238         void *pio_data;
 239
 240         struct kvm_queued_exception {
 241                 bool pending;
 242                 bool has_error_code;
 243                 u8 nr;
 244                 u32 error_code;
 245         } exception;
 246
 247         struct {
 248                 int active;
 249                 u8 save_iopl;
 250                 struct kvm_save_segment {
 251                         u16 selector;
 252                         unsigned long base;
 253                         u32 limit;
 254                         u32 ar;
 255                 } tr, es, ds, fs, gs;
 256         } rmode;
 257         int halt_request; /* real mode on Intel only */
 258
 259         int cpuid_nent;
 260         struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 261         /* emulate context */
 262
 263         struct x86_emulate_ctxt emulate_ctxt;
 264 };
 265
 266 struct kvm_mem_alias {
 267         gfn_t base_gfn;
 268         unsigned long npages;
 269         gfn_t target_gfn;
 270 };
 271
 272 struct kvm_arch{
 273         int naliases;
 274         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 275
 276         unsigned int n_free_mmu_pages;
 277         unsigned int n_requested_mmu_pages;
 278         unsigned int n_alloc_mmu_pages;
 279         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 280         /*
 281          * Hash table of struct kvm_mmu_page.
 282          */
 283         struct list_head active_mmu_pages;
 284         struct kvm_pic *vpic;
 285         struct kvm_ioapic *vioapic;
 286
 287         int round_robin_prev_vcpu;
 288         unsigned int tss_addr;
 289         struct page *apic_access_page;
 290 };
 291
 292 struct kvm_vm_stat {
 293         u32 mmu_shadow_zapped;
 294         u32 mmu_pte_write;
 295         u32 mmu_pte_updated;
 296         u32 mmu_pde_zapped;
 297         u32 mmu_flooded;
 298         u32 mmu_recycled;
 299         u32 mmu_cache_miss;
 300         u32 remote_tlb_flush;
 301 };
 302
 303 struct kvm_vcpu_stat {
 304         u32 pf_fixed;
 305         u32 pf_guest;
 306         u32 tlb_flush;
 307         u32 invlpg;
 308
 309         u32 exits;
 310         u32 io_exits;
 311         u32 mmio_exits;
 312         u32 signal_exits;
 313         u32 irq_window_exits;
 314         u32 halt_exits;
 315         u32 halt_wakeup;
 316         u32 request_irq_exits;
 317         u32 irq_exits;
 318         u32 host_state_reload;
 319         u32 efer_reload;
 320         u32 fpu_reload;
 321         u32 insn_emulation;
 322         u32 insn_emulation_fail;
 323 };
 324
 325 struct descriptor_table {
 326         u16 limit;
 327         unsigned long base;
 328 } __attribute__((packed));
 329
 330 struct kvm_x86_ops {
 331         int (*cpu_has_kvm_support)(void);          /* __init */
 332         int (*disabled_by_bios)(void);             /* __init */
 333         void (*hardware_enable)(void *dummy);      /* __init */
 334         void (*hardware_disable)(void *dummy);
 335         void (*check_processor_compatibility)(void *rtn);
 336         int (*hardware_setup)(void);               /* __init */
 337         void (*hardware_unsetup)(void);            /* __exit */
 338         bool (*cpu_has_accelerated_tpr)(void);
 339
 340         /* Create, but do not attach this VCPU */
 341         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 342         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 343         int (*vcpu_reset)(struct kvm_vcpu *vcpu);
 344
 345         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 346         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 347         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 348         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 349
 350         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 351                                struct kvm_debug_guest *dbg);
 352         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 353         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 354         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 355         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 356         void (*get_segment)(struct kvm_vcpu *vcpu,
 357                             struct kvm_segment *var, int seg);
 358         void (*set_segment)(struct kvm_vcpu *vcpu,
 359                             struct kvm_segment *var, int seg);
 360         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 361         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 362         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 363         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 364         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 365         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 366         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 367         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 368         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 369         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 370         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 371         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 372                        int *exception);
 373         void (*cache_regs)(struct kvm_vcpu *vcpu);
 374         void (*decache_regs)(struct kvm_vcpu *vcpu);
 375         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 376         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 377
 378         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 379
 380         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 381         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 382         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 383         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 384                                 unsigned char *hypercall_addr);
 385         int (*get_irq)(struct kvm_vcpu *vcpu);
 386         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 387         void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
 388                                 bool has_error_code, u32 error_code);
 389         bool (*exception_injected)(struct kvm_vcpu *vcpu);
 390         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 391         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 392                                        struct kvm_run *run);
 393
 394         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 395 };
 396
 397 extern struct kvm_x86_ops *kvm_x86_ops;
 398
 399 int kvm_mmu_module_init(void);
 400 void kvm_mmu_module_exit(void);
 401
 402 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 403 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 404 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 405 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 406
 407 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 408 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 409 void kvm_mmu_zap_all(struct kvm *kvm);
 410 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
 411 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
 412
 413 enum emulation_result {
 414         EMULATE_DONE,       /* no further processing */
 415         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 416         EMULATE_FAIL,         /* can't emulate this instruction */
 417 };
 418
 419 #define EMULTYPE_NO_DECODE          (1 << 0)
 420 #define EMULTYPE_TRAP_UD            (1 << 1)
 421 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 422                         unsigned long cr2, u16 error_code, int emulation_type);
 423 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 424 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 425 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 426 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 427                    unsigned long *rflags);
 428
 429 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 430 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 431                      unsigned long *rflags);
 432 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 433 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 434
 435 struct x86_emulate_ctxt;
 436
 437 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 438                      int size, unsigned port);
 439 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 440                            int size, unsigned long count, int down,
 441                             gva_t address, int rep, unsigned port);
 442 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 443 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 444 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 445 int emulate_clts(struct kvm_vcpu *vcpu);
 446 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
 447                     unsigned long *dest);
 448 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 449                     unsigned long value);
 450
 451 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 452 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 453 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 454 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 455 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 456 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 457 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 458
 459 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 460 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 461
 462 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 463 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 464 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
 465                            u32 error_code);
 466
 467 void fx_init(struct kvm_vcpu *vcpu);
 468
 469 int emulator_read_std(unsigned long addr,
 470                       void *val,
 471                       unsigned int bytes,
 472                       struct kvm_vcpu *vcpu);
 473 int emulator_write_emulated(unsigned long addr,
 474                             const void *val,
 475                             unsigned int bytes,
 476                             struct kvm_vcpu *vcpu);
 477
 478 unsigned long segment_base(u16 selector);
 479
 480 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
 481 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 482                        const u8 *new, int bytes);
 483 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 484 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 485 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 486 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 487
 488 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 489
 490 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 491
 492 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 493
 494 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 495 int complete_pio(struct kvm_vcpu *vcpu);
 496
 497 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 498 {
 499         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 500
 501         return (struct kvm_mmu_page *)page_private(page);
 502 }
 503
 504 static inline u16 read_fs(void)
 505 {
 506         u16 seg;
 507         asm("mov %%fs, %0" : "=g"(seg));
 508         return seg;
 509 }
 510
 511 static inline u16 read_gs(void)
 512 {
 513         u16 seg;
 514         asm("mov %%gs, %0" : "=g"(seg));
 515         return seg;
 516 }
 517
 518 static inline u16 read_ldt(void)
 519 {
 520         u16 ldt;
 521         asm("sldt %0" : "=g"(ldt));
 522         return ldt;
 523 }
 524
 525 static inline void load_fs(u16 sel)
 526 {
 527         asm("mov %0, %%fs" : : "rm"(sel));
 528 }
 529
 530 static inline void load_gs(u16 sel)
 531 {
 532         asm("mov %0, %%gs" : : "rm"(sel));
 533 }
 534
 535 #ifndef load_ldt
 536 static inline void load_ldt(u16 sel)
 537 {
 538         asm("lldt %0" : : "rm"(sel));
 539 }
 540 #endif
 541
 542 static inline void get_idt(struct descriptor_table *table)
 543 {
 544         asm("sidt %0" : "=m"(*table));
 545 }
 546
 547 static inline void get_gdt(struct descriptor_table *table)
 548 {
 549         asm("sgdt %0" : "=m"(*table));
 550 }
 551
 552 static inline unsigned long read_tr_base(void)
 553 {
 554         u16 tr;
 555         asm("str %0" : "=g"(tr));
 556         return segment_base(tr);
 557 }
 558
 559 #ifdef CONFIG_X86_64
 560 static inline unsigned long read_msr(unsigned long msr)
 561 {
 562         u64 value;
 563
 564         rdmsrl(msr, value);
 565         return value;
 566 }
 567 #endif
 568
 569 static inline void fx_save(struct i387_fxsave_struct *image)
 570 {
 571         asm("fxsave (%0)":: "r" (image));
 572 }
 573
 574 static inline void fx_restore(struct i387_fxsave_struct *image)
 575 {
 576         asm("fxrstor (%0)":: "r" (image));
 577 }
 578
 579 static inline void fpu_init(void)
 580 {
 581         asm("finit");
 582 }
 583
 584 static inline u32 get_rdx_init_val(void)
 585 {
 586         return 0x600; /* P6 family */
 587 }
 588
 589 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 590 {
 591         kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 592 }
 593
 594 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 595 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 596 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 597 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 598 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 599 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 600 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 601 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 602 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 603
 604 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 605
 606 #define TSS_IOPB_BASE_OFFSET 0x66
 607 #define TSS_BASE_SIZE 0x68
 608 #define TSS_IOPB_SIZE (65536 / 8)
 609 #define TSS_REDIRECTION_SIZE (256 / 8)
 610 #define RMODE_TSS_SIZE                                                  \
 611         (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 612
 613 #endif