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