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_ALIAS_SLOTS 4
  55 #define KVM_MEMORY_SLOTS 4
  56 #define KVM_NUM_MMU_PAGES 256
  57 #define KVM_MIN_FREE_MMU_PAGES 5
  58 #define KVM_REFILL_PAGES 25
  59 #define KVM_MAX_CPUID_ENTRIES 40
  60
  61 #define FX_IMAGE_SIZE 512
  62 #define FX_IMAGE_ALIGN 16
  63 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
  64
  65 #define DE_VECTOR 0
  66 #define NM_VECTOR 7
  67 #define DF_VECTOR 8
  68 #define TS_VECTOR 10
  69 #define NP_VECTOR 11
  70 #define SS_VECTOR 12
  71 #define GP_VECTOR 13
  72 #define PF_VECTOR 14
  73
  74 #define SELECTOR_TI_MASK (1 << 2)
  75 #define SELECTOR_RPL_MASK 0x03
  76
  77 #define IOPL_SHIFT 12
  78
  79 #define KVM_PIO_PAGE_OFFSET 1
  80
  81 /*
  82  * Address types:
  83  *
  84  *  gva - guest virtual address
  85  *  gpa - guest physical address
  86  *  gfn - guest frame number
  87  *  hva - host virtual address
  88  *  hpa - host physical address
  89  *  hfn - host frame number
  90  */
  91
  92 typedef unsigned long  gva_t;
  93 typedef u64            gpa_t;
  94 typedef unsigned long  gfn_t;
  95
  96 typedef unsigned long  hva_t;
  97 typedef u64            hpa_t;
  98 typedef unsigned long  hfn_t;
  99
 100 #define NR_PTE_CHAIN_ENTRIES 5
 101
 102 struct kvm_pte_chain {
 103         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
 104         struct hlist_node link;
 105 };
 106
 107 /*
 108  * kvm_mmu_page_role, below, is defined as:
 109  *
 110  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 111  *   bits 4:7 - page table level for this shadow (1-4)
 112  *   bits 8:9 - page table quadrant for 2-level guests
 113  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 114  *   bits 17:18 - "access" - the user and writable bits of a huge page pde
 115  */
 116 union kvm_mmu_page_role {
 117         unsigned word;
 118         struct {
 119                 unsigned glevels : 4;
 120                 unsigned level : 4;
 121                 unsigned quadrant : 2;
 122                 unsigned pad_for_nice_hex_output : 6;
 123                 unsigned metaphysical : 1;
 124                 unsigned hugepage_access : 2;
 125         };
 126 };
 127
 128 struct kvm_mmu_page {
 129         struct list_head link;
 130         struct hlist_node hash_link;
 131
 132         /*
 133          * The following two entries are used to key the shadow page in the
 134          * hash table.
 135          */
 136         gfn_t gfn;
 137         union kvm_mmu_page_role role;
 138
 139         hpa_t page_hpa;
 140         unsigned long slot_bitmap; /* One bit set per slot which has memory
 141                                     * in this shadow page.
 142                                     */
 143         int multimapped;         /* More than one parent_pte? */
 144         int root_count;          /* Currently serving as active root */
 145         union {
 146                 u64 *parent_pte;               /* !multimapped */
 147                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 148         };
 149 };
 150
 151 struct vmcs {
 152         u32 revision_id;
 153         u32 abort;
 154         char data[0];
 155 };
 156
 157 #define vmx_msr_entry kvm_msr_entry
 158
 159 struct kvm_vcpu;
 160
 161 /*
 162  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 163  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 164  * mode.
 165  */
 166 struct kvm_mmu {
 167         void (*new_cr3)(struct kvm_vcpu *vcpu);
 168         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 169         void (*free)(struct kvm_vcpu *vcpu);
 170         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 171         hpa_t root_hpa;
 172         int root_level;
 173         int shadow_root_level;
 174
 175         u64 *pae_root;
 176 };
 177
 178 #define KVM_NR_MEM_OBJS 20
 179
 180 struct kvm_mmu_memory_cache {
 181         int nobjs;
 182         void *objects[KVM_NR_MEM_OBJS];
 183 };
 184
 185 /*
 186  * We don't want allocation failures within the mmu code, so we preallocate
 187  * enough memory for a single page fault in a cache.
 188  */
 189 struct kvm_guest_debug {
 190         int enabled;
 191         unsigned long bp[4];
 192         int singlestep;
 193 };
 194
 195 enum {
 196         VCPU_REGS_RAX = 0,
 197         VCPU_REGS_RCX = 1,
 198         VCPU_REGS_RDX = 2,
 199         VCPU_REGS_RBX = 3,
 200         VCPU_REGS_RSP = 4,
 201         VCPU_REGS_RBP = 5,
 202         VCPU_REGS_RSI = 6,
 203         VCPU_REGS_RDI = 7,
 204 #ifdef CONFIG_X86_64
 205         VCPU_REGS_R8 = 8,
 206         VCPU_REGS_R9 = 9,
 207         VCPU_REGS_R10 = 10,
 208         VCPU_REGS_R11 = 11,
 209         VCPU_REGS_R12 = 12,
 210         VCPU_REGS_R13 = 13,
 211         VCPU_REGS_R14 = 14,
 212         VCPU_REGS_R15 = 15,
 213 #endif
 214         NR_VCPU_REGS
 215 };
 216
 217 enum {
 218         VCPU_SREG_CS,
 219         VCPU_SREG_DS,
 220         VCPU_SREG_ES,
 221         VCPU_SREG_FS,
 222         VCPU_SREG_GS,
 223         VCPU_SREG_SS,
 224         VCPU_SREG_TR,
 225         VCPU_SREG_LDTR,
 226 };
 227
 228 struct kvm_pio_request {
 229         unsigned long count;
 230         int cur_count;
 231         struct page *guest_pages[2];
 232         unsigned guest_page_offset;
 233         int in;
 234         int size;
 235         int string;
 236         int down;
 237         int rep;
 238 };
 239
 240 struct kvm_stat {
 241         u32 pf_fixed;
 242         u32 pf_guest;
 243         u32 tlb_flush;
 244         u32 invlpg;
 245
 246         u32 exits;
 247         u32 io_exits;
 248         u32 mmio_exits;
 249         u32 signal_exits;
 250         u32 irq_window_exits;
 251         u32 halt_exits;
 252         u32 request_irq_exits;
 253         u32 irq_exits;
 254 };
 255
 256 struct kvm_vcpu {
 257         struct kvm *kvm;
 258         union {
 259                 struct vmcs *vmcs;
 260                 struct vcpu_svm *svm;
 261         };
 262         struct mutex mutex;
 263         int   cpu;
 264         int   launched;
 265         u64 host_tsc;
 266         struct kvm_run *run;
 267         int interrupt_window_open;
 268         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 269 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
 270         unsigned long irq_pending[NR_IRQ_WORDS];
 271         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 272         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 273
 274         unsigned long cr0;
 275         unsigned long cr2;
 276         unsigned long cr3;
 277         gpa_t para_state_gpa;
 278         struct page *para_state_page;
 279         gpa_t hypercall_gpa;
 280         unsigned long cr4;
 281         unsigned long cr8;
 282         u64 pdptrs[4]; /* pae */
 283         u64 shadow_efer;
 284         u64 apic_base;
 285         u64 ia32_misc_enable_msr;
 286         int nmsrs;
 287         struct vmx_msr_entry *guest_msrs;
 288         struct vmx_msr_entry *host_msrs;
 289
 290         struct list_head free_pages;
 291         struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
 292         struct kvm_mmu mmu;
 293
 294         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 295         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 296
 297         gfn_t last_pt_write_gfn;
 298         int   last_pt_write_count;
 299
 300         struct kvm_guest_debug guest_debug;
 301
 302         char fx_buf[FX_BUF_SIZE];
 303         char *host_fx_image;
 304         char *guest_fx_image;
 305         int fpu_active;
 306
 307         int mmio_needed;
 308         int mmio_read_completed;
 309         int mmio_is_write;
 310         int mmio_size;
 311         unsigned char mmio_data[8];
 312         gpa_t mmio_phys_addr;
 313         struct kvm_pio_request pio;
 314         void *pio_data;
 315
 316         int sigset_active;
 317         sigset_t sigset;
 318
 319         struct kvm_stat stat;
 320
 321         struct {
 322                 int active;
 323                 u8 save_iopl;
 324                 struct kvm_save_segment {
 325                         u16 selector;
 326                         unsigned long base;
 327                         u32 limit;
 328                         u32 ar;
 329                 } tr, es, ds, fs, gs;
 330         } rmode;
 331
 332         int cpuid_nent;
 333         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 334 };
 335
 336 struct kvm_mem_alias {
 337         gfn_t base_gfn;
 338         unsigned long npages;
 339         gfn_t target_gfn;
 340 };
 341
 342 struct kvm_memory_slot {
 343         gfn_t base_gfn;
 344         unsigned long npages;
 345         unsigned long flags;
 346         struct page **phys_mem;
 347         unsigned long *dirty_bitmap;
 348 };
 349
 350 struct kvm {
 351         spinlock_t lock; /* protects everything except vcpus */
 352         int naliases;
 353         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 354         int nmemslots;
 355         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 356         /*
 357          * Hash table of struct kvm_mmu_page.
 358          */
 359         struct list_head active_mmu_pages;
 360         int n_free_mmu_pages;
 361         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 362         struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 363         int memory_config_version;
 364         int busy;
 365         unsigned long rmap_overflow;
 366         struct list_head vm_list;
 367         struct file *filp;
 368 };
 369
 370 struct descriptor_table {
 371         u16 limit;
 372         unsigned long base;
 373 } __attribute__((packed));
 374
 375 struct kvm_arch_ops {
 376         int (*cpu_has_kvm_support)(void);          /* __init */
 377         int (*disabled_by_bios)(void);             /* __init */
 378         void (*hardware_enable)(void *dummy);      /* __init */
 379         void (*hardware_disable)(void *dummy);
 380         int (*hardware_setup)(void);               /* __init */
 381         void (*hardware_unsetup)(void);            /* __exit */
 382
 383         int (*vcpu_create)(struct kvm_vcpu *vcpu);
 384         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 385
 386         void (*vcpu_load)(struct kvm_vcpu *vcpu);
 387         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 388         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 389
 390         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 391                                struct kvm_debug_guest *dbg);
 392         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 393         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 394         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 395         void (*get_segment)(struct kvm_vcpu *vcpu,
 396                             struct kvm_segment *var, int seg);
 397         void (*set_segment)(struct kvm_vcpu *vcpu,
 398                             struct kvm_segment *var, int seg);
 399         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 400         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 401         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 402         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 403         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 404         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 405         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 406         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 407         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 408         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 409         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 410         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 411                        int *exception);
 412         void (*cache_regs)(struct kvm_vcpu *vcpu);
 413         void (*decache_regs)(struct kvm_vcpu *vcpu);
 414         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 415         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 416
 417         void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 418         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 419         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 420                                   unsigned long addr, u32 err_code);
 421
 422         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 423
 424         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 425         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 426         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 427         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 428                                 unsigned char *hypercall_addr);
 429 };
 430
 431 extern struct kvm_arch_ops *kvm_arch_ops;
 432
 433 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 434 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 435
 436 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 437 void kvm_exit_arch(void);
 438
 439 int kvm_mmu_module_init(void);
 440 void kvm_mmu_module_exit(void);
 441
 442 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 443 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 444 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 445
 446 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 447 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
 448 void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
 449
 450 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 451 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 452 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 453 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 454 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 455 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 456
 457 void kvm_emulator_want_group7_invlpg(void);
 458
 459 extern hpa_t bad_page_address;
 460
 461 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 462 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 463 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 464
 465 enum emulation_result {
 466         EMULATE_DONE,       /* no further processing */
 467         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 468         EMULATE_FAIL,         /* can't emulate this instruction */
 469 };
 470
 471 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 472                         unsigned long cr2, u16 error_code);
 473 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 474 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 475 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 476                    unsigned long *rflags);
 477
 478 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 479 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 480                      unsigned long *rflags);
 481
 482 struct x86_emulate_ctxt;
 483
 484 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 485                   int size, unsigned long count, int string, int down,
 486                   gva_t address, int rep, unsigned port);
 487 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 488 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 489 int emulate_clts(struct kvm_vcpu *vcpu);
 490 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 491                     unsigned long *dest);
 492 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 493                     unsigned long value);
 494
 495 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 496 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 497 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 498 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 499 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 500
 501 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 502 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 503
 504 void fx_init(struct kvm_vcpu *vcpu);
 505
 506 void load_msrs(struct vmx_msr_entry *e, int n);
 507 void save_msrs(struct vmx_msr_entry *e, int n);
 508 void kvm_resched(struct kvm_vcpu *vcpu);
 509
 510 int kvm_read_guest(struct kvm_vcpu *vcpu,
 511                gva_t addr,
 512                unsigned long size,
 513                void *dest);
 514
 515 int kvm_write_guest(struct kvm_vcpu *vcpu,
 516                 gva_t addr,
 517                 unsigned long size,
 518                 void *data);
 519
 520 unsigned long segment_base(u16 selector);
 521
 522 void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 523 void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 524 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 525 void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 526
 527 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
 528
 529 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 530                                      u32 error_code)
 531 {
 532         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 533                 kvm_mmu_free_some_pages(vcpu);
 534         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 535 }
 536
 537 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 538 {
 539 #ifdef CONFIG_X86_64
 540         return vcpu->shadow_efer & EFER_LME;
 541 #else
 542         return 0;
 543 #endif
 544 }
 545
 546 static inline int is_pae(struct kvm_vcpu *vcpu)
 547 {
 548         return vcpu->cr4 & CR4_PAE_MASK;
 549 }
 550
 551 static inline int is_pse(struct kvm_vcpu *vcpu)
 552 {
 553         return vcpu->cr4 & CR4_PSE_MASK;
 554 }
 555
 556 static inline int is_paging(struct kvm_vcpu *vcpu)
 557 {
 558         return vcpu->cr0 & CR0_PG_MASK;
 559 }
 560
 561 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 562 {
 563         return slot - kvm->memslots;
 564 }
 565
 566 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 567 {
 568         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 569
 570         return (struct kvm_mmu_page *)page_private(page);
 571 }
 572
 573 static inline u16 read_fs(void)
 574 {
 575         u16 seg;
 576         asm ("mov %%fs, %0" : "=g"(seg));
 577         return seg;
 578 }
 579
 580 static inline u16 read_gs(void)
 581 {
 582         u16 seg;
 583         asm ("mov %%gs, %0" : "=g"(seg));
 584         return seg;
 585 }
 586
 587 static inline u16 read_ldt(void)
 588 {
 589         u16 ldt;
 590         asm ("sldt %0" : "=g"(ldt));
 591         return ldt;
 592 }
 593
 594 static inline void load_fs(u16 sel)
 595 {
 596         asm ("mov %0, %%fs" : : "rm"(sel));
 597 }
 598
 599 static inline void load_gs(u16 sel)
 600 {
 601         asm ("mov %0, %%gs" : : "rm"(sel));
 602 }
 603
 604 #ifndef load_ldt
 605 static inline void load_ldt(u16 sel)
 606 {
 607         asm ("lldt %0" : : "rm"(sel));
 608 }
 609 #endif
 610
 611 static inline void get_idt(struct descriptor_table *table)
 612 {
 613         asm ("sidt %0" : "=m"(*table));
 614 }
 615
 616 static inline void get_gdt(struct descriptor_table *table)
 617 {
 618         asm ("sgdt %0" : "=m"(*table));
 619 }
 620
 621 static inline unsigned long read_tr_base(void)
 622 {
 623         u16 tr;
 624         asm ("str %0" : "=g"(tr));
 625         return segment_base(tr);
 626 }
 627
 628 #ifdef CONFIG_X86_64
 629 static inline unsigned long read_msr(unsigned long msr)
 630 {
 631         u64 value;
 632
 633         rdmsrl(msr, value);
 634         return value;
 635 }
 636 #endif
 637
 638 static inline void fx_save(void *image)
 639 {
 640         asm ("fxsave (%0)":: "r" (image));
 641 }
 642
 643 static inline void fx_restore(void *image)
 644 {
 645         asm ("fxrstor (%0)":: "r" (image));
 646 }
 647
 648 static inline void fpu_init(void)
 649 {
 650         asm ("finit");
 651 }
 652
 653 static inline u32 get_rdx_init_val(void)
 654 {
 655         return 0x600; /* P6 family */
 656 }
 657
 658 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 659 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 660 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 661 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 662 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 663 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 664 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 665 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 666 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 667
 668 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 669
 670 #define TSS_IOPB_BASE_OFFSET 0x66
 671 #define TSS_BASE_SIZE 0x68
 672 #define TSS_IOPB_SIZE (65536 / 8)
 673 #define TSS_REDIRECTION_SIZE (256 / 8)
 674 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 675
 676 #endif