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