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/signal.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/preempt.h>
  17 #include <asm/signal.h>
  18
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_para.h>
  21
  22 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
  23 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
  24 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS|0xFFFFFF0000000000ULL)
  25
  26 #define KVM_GUEST_CR0_MASK \
  27         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE \
  28          | X86_CR0_NW | X86_CR0_CD)
  29 #define KVM_VM_CR0_ALWAYS_ON \
  30         (X86_CR0_PG | X86_CR0_PE | X86_CR0_WP | X86_CR0_NE | X86_CR0_TS \
  31          | X86_CR0_MP)
  32 #define KVM_GUEST_CR4_MASK \
  33         (X86_CR4_VME | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_PGE | X86_CR4_VMXE)
  34 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
  35 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
  36
  37 #define INVALID_PAGE (~(hpa_t)0)
  38 #define UNMAPPED_GVA (~(gpa_t)0)
  39
  40 #define KVM_MAX_VCPUS 4
  41 #define KVM_ALIAS_SLOTS 4
  42 #define KVM_MEMORY_SLOTS 8
  43 #define KVM_NUM_MMU_PAGES 1024
  44 #define KVM_MIN_FREE_MMU_PAGES 5
  45 #define KVM_REFILL_PAGES 25
  46 #define KVM_MAX_CPUID_ENTRIES 40
  47
  48 #define DE_VECTOR 0
  49 #define UD_VECTOR 6
  50 #define NM_VECTOR 7
  51 #define DF_VECTOR 8
  52 #define TS_VECTOR 10
  53 #define NP_VECTOR 11
  54 #define SS_VECTOR 12
  55 #define GP_VECTOR 13
  56 #define PF_VECTOR 14
  57
  58 #define SELECTOR_TI_MASK (1 << 2)
  59 #define SELECTOR_RPL_MASK 0x03
  60
  61 #define IOPL_SHIFT 12
  62
  63 #define KVM_PIO_PAGE_OFFSET 1
  64
  65 /*
  66  * vcpu->requests bit members
  67  */
  68 #define KVM_TLB_FLUSH 0
  69
  70 /*
  71  * Address types:
  72  *
  73  *  gva - guest virtual address
  74  *  gpa - guest physical address
  75  *  gfn - guest frame number
  76  *  hva - host virtual address
  77  *  hpa - host physical address
  78  *  hfn - host frame number
  79  */
  80
  81 typedef unsigned long  gva_t;
  82 typedef u64            gpa_t;
  83 typedef unsigned long  gfn_t;
  84
  85 typedef unsigned long  hva_t;
  86 typedef u64            hpa_t;
  87 typedef unsigned long  hfn_t;
  88
  89 #define NR_PTE_CHAIN_ENTRIES 5
  90
  91 struct kvm_pte_chain {
  92         u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
  93         struct hlist_node link;
  94 };
  95
  96 /*
  97  * kvm_mmu_page_role, below, is defined as:
  98  *
  99  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 100  *   bits 4:7 - page table level for this shadow (1-4)
 101  *   bits 8:9 - page table quadrant for 2-level guests
 102  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 103  *   bits 17:19 - "access" - the user, writable, and nx bits of a huge page pde
 104  */
 105 union kvm_mmu_page_role {
 106         unsigned word;
 107         struct {
 108                 unsigned glevels : 4;
 109                 unsigned level : 4;
 110                 unsigned quadrant : 2;
 111                 unsigned pad_for_nice_hex_output : 6;
 112                 unsigned metaphysical : 1;
 113                 unsigned hugepage_access : 3;
 114         };
 115 };
 116
 117 struct kvm_mmu_page {
 118         struct list_head link;
 119         struct hlist_node hash_link;
 120
 121         /*
 122          * The following two entries are used to key the shadow page in the
 123          * hash table.
 124          */
 125         gfn_t gfn;
 126         union kvm_mmu_page_role role;
 127
 128         u64 *spt;
 129         unsigned long slot_bitmap; /* One bit set per slot which has memory
 130                                     * in this shadow page.
 131                                     */
 132         int multimapped;         /* More than one parent_pte? */
 133         int root_count;          /* Currently serving as active root */
 134         union {
 135                 u64 *parent_pte;               /* !multimapped */
 136                 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
 137         };
 138 };
 139
 140 struct kvm_vcpu;
 141 extern struct kmem_cache *kvm_vcpu_cache;
 142
 143 /*
 144  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 145  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 146  * mode.
 147  */
 148 struct kvm_mmu {
 149         void (*new_cr3)(struct kvm_vcpu *vcpu);
 150         int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 151         void (*free)(struct kvm_vcpu *vcpu);
 152         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 153         void (*prefetch_page)(struct kvm_vcpu *vcpu,
 154                               struct kvm_mmu_page *page);
 155         hpa_t root_hpa;
 156         int root_level;
 157         int shadow_root_level;
 158
 159         u64 *pae_root;
 160 };
 161
 162 #define KVM_NR_MEM_OBJS 20
 163
 164 struct kvm_mmu_memory_cache {
 165         int nobjs;
 166         void *objects[KVM_NR_MEM_OBJS];
 167 };
 168
 169 /*
 170  * We don't want allocation failures within the mmu code, so we preallocate
 171  * enough memory for a single page fault in a cache.
 172  */
 173 struct kvm_guest_debug {
 174         int enabled;
 175         unsigned long bp[4];
 176         int singlestep;
 177 };
 178
 179 enum {
 180         VCPU_REGS_RAX = 0,
 181         VCPU_REGS_RCX = 1,
 182         VCPU_REGS_RDX = 2,
 183         VCPU_REGS_RBX = 3,
 184         VCPU_REGS_RSP = 4,
 185         VCPU_REGS_RBP = 5,
 186         VCPU_REGS_RSI = 6,
 187         VCPU_REGS_RDI = 7,
 188 #ifdef CONFIG_X86_64
 189         VCPU_REGS_R8 = 8,
 190         VCPU_REGS_R9 = 9,
 191         VCPU_REGS_R10 = 10,
 192         VCPU_REGS_R11 = 11,
 193         VCPU_REGS_R12 = 12,
 194         VCPU_REGS_R13 = 13,
 195         VCPU_REGS_R14 = 14,
 196         VCPU_REGS_R15 = 15,
 197 #endif
 198         NR_VCPU_REGS
 199 };
 200
 201 enum {
 202         VCPU_SREG_CS,
 203         VCPU_SREG_DS,
 204         VCPU_SREG_ES,
 205         VCPU_SREG_FS,
 206         VCPU_SREG_GS,
 207         VCPU_SREG_SS,
 208         VCPU_SREG_TR,
 209         VCPU_SREG_LDTR,
 210 };
 211
 212 #include "x86_emulate.h"
 213
 214 struct kvm_pio_request {
 215         unsigned long count;
 216         int cur_count;
 217         struct page *guest_pages[2];
 218         unsigned guest_page_offset;
 219         int in;
 220         int port;
 221         int size;
 222         int string;
 223         int down;
 224         int rep;
 225 };
 226
 227 struct kvm_stat {
 228         u32 pf_fixed;
 229         u32 pf_guest;
 230         u32 tlb_flush;
 231         u32 invlpg;
 232
 233         u32 exits;
 234         u32 io_exits;
 235         u32 mmio_exits;
 236         u32 signal_exits;
 237         u32 irq_window_exits;
 238         u32 halt_exits;
 239         u32 halt_wakeup;
 240         u32 request_irq_exits;
 241         u32 irq_exits;
 242         u32 light_exits;
 243         u32 efer_reload;
 244 };
 245
 246 struct kvm_io_device {
 247         void (*read)(struct kvm_io_device *this,
 248                      gpa_t addr,
 249                      int len,
 250                      void *val);
 251         void (*write)(struct kvm_io_device *this,
 252                       gpa_t addr,
 253                       int len,
 254                       const void *val);
 255         int (*in_range)(struct kvm_io_device *this, gpa_t addr);
 256         void (*destructor)(struct kvm_io_device *this);
 257
 258         void             *private;
 259 };
 260
 261 static inline void kvm_iodevice_read(struct kvm_io_device *dev,
 262                                      gpa_t addr,
 263                                      int len,
 264                                      void *val)
 265 {
 266         dev->read(dev, addr, len, val);
 267 }
 268
 269 static inline void kvm_iodevice_write(struct kvm_io_device *dev,
 270                                       gpa_t addr,
 271                                       int len,
 272                                       const void *val)
 273 {
 274         dev->write(dev, addr, len, val);
 275 }
 276
 277 static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
 278 {
 279         return dev->in_range(dev, addr);
 280 }
 281
 282 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
 283 {
 284         if (dev->destructor)
 285                 dev->destructor(dev);
 286 }
 287
 288 /*
 289  * It would be nice to use something smarter than a linear search, TBD...
 290  * Thankfully we dont expect many devices to register (famous last words :),
 291  * so until then it will suffice.  At least its abstracted so we can change
 292  * in one place.
 293  */
 294 struct kvm_io_bus {
 295         int                   dev_count;
 296 #define NR_IOBUS_DEVS 6
 297         struct kvm_io_device *devs[NR_IOBUS_DEVS];
 298 };
 299
 300 void kvm_io_bus_init(struct kvm_io_bus *bus);
 301 void kvm_io_bus_destroy(struct kvm_io_bus *bus);
 302 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
 303 void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
 304                              struct kvm_io_device *dev);
 305
 306 struct kvm_vcpu {
 307         struct kvm *kvm;
 308         struct preempt_notifier preempt_notifier;
 309         int vcpu_id;
 310         struct mutex mutex;
 311         int   cpu;
 312         u64 host_tsc;
 313         struct kvm_run *run;
 314         int interrupt_window_open;
 315         int guest_mode;
 316         unsigned long requests;
 317         unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 318         DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
 319         unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 320         unsigned long rip;      /* needs vcpu_load_rsp_rip() */
 321
 322         unsigned long cr0;
 323         unsigned long cr2;
 324         unsigned long cr3;
 325         unsigned long cr4;
 326         unsigned long cr8;
 327         u64 pdptrs[4]; /* pae */
 328         u64 shadow_efer;
 329         u64 apic_base;
 330         struct kvm_lapic *apic;    /* kernel irqchip context */
 331 #define VCPU_MP_STATE_RUNNABLE          0
 332 #define VCPU_MP_STATE_UNINITIALIZED     1
 333 #define VCPU_MP_STATE_INIT_RECEIVED     2
 334 #define VCPU_MP_STATE_SIPI_RECEIVED     3
 335 #define VCPU_MP_STATE_HALTED            4
 336         int mp_state;
 337         int sipi_vector;
 338         u64 ia32_misc_enable_msr;
 339
 340         struct kvm_mmu mmu;
 341
 342         struct kvm_mmu_memory_cache mmu_pte_chain_cache;
 343         struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
 344         struct kvm_mmu_memory_cache mmu_page_cache;
 345         struct kvm_mmu_memory_cache mmu_page_header_cache;
 346
 347         gfn_t last_pt_write_gfn;
 348         int   last_pt_write_count;
 349         u64  *last_pte_updated;
 350
 351         struct kvm_guest_debug guest_debug;
 352
 353         struct i387_fxsave_struct host_fx_image;
 354         struct i387_fxsave_struct guest_fx_image;
 355         int fpu_active;
 356         int guest_fpu_loaded;
 357
 358         int mmio_needed;
 359         int mmio_read_completed;
 360         int mmio_is_write;
 361         int mmio_size;
 362         unsigned char mmio_data[8];
 363         gpa_t mmio_phys_addr;
 364         gva_t mmio_fault_cr2;
 365         struct kvm_pio_request pio;
 366         void *pio_data;
 367         wait_queue_head_t wq;
 368
 369         int sigset_active;
 370         sigset_t sigset;
 371
 372         struct kvm_stat stat;
 373
 374         struct {
 375                 int active;
 376                 u8 save_iopl;
 377                 struct kvm_save_segment {
 378                         u16 selector;
 379                         unsigned long base;
 380                         u32 limit;
 381                         u32 ar;
 382                 } tr, es, ds, fs, gs;
 383         } rmode;
 384         int halt_request; /* real mode on Intel only */
 385
 386         int cpuid_nent;
 387         struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
 388
 389         /* emulate context */
 390
 391         struct x86_emulate_ctxt emulate_ctxt;
 392 };
 393
 394 struct kvm_mem_alias {
 395         gfn_t base_gfn;
 396         unsigned long npages;
 397         gfn_t target_gfn;
 398 };
 399
 400 struct kvm_memory_slot {
 401         gfn_t base_gfn;
 402         unsigned long npages;
 403         unsigned long flags;
 404         struct page **phys_mem;
 405         unsigned long *dirty_bitmap;
 406 };
 407
 408 struct kvm {
 409         struct mutex lock; /* protects everything except vcpus */
 410         int naliases;
 411         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
 412         int nmemslots;
 413         struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 414         /*
 415          * Hash table of struct kvm_mmu_page.
 416          */
 417         struct list_head active_mmu_pages;
 418         int n_free_mmu_pages;
 419         struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 420         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 421         unsigned long rmap_overflow;
 422         struct list_head vm_list;
 423         struct file *filp;
 424         struct kvm_io_bus mmio_bus;
 425         struct kvm_io_bus pio_bus;
 426         struct kvm_pic *vpic;
 427         struct kvm_ioapic *vioapic;
 428         int round_robin_prev_vcpu;
 429 };
 430
 431 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
 432 {
 433         return kvm->vpic;
 434 }
 435
 436 static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 437 {
 438         return kvm->vioapic;
 439 }
 440
 441 static inline int irqchip_in_kernel(struct kvm *kvm)
 442 {
 443         return pic_irqchip(kvm) != 0;
 444 }
 445
 446 struct descriptor_table {
 447         u16 limit;
 448         unsigned long base;
 449 } __attribute__((packed));
 450
 451 struct kvm_x86_ops {
 452         int (*cpu_has_kvm_support)(void);          /* __init */
 453         int (*disabled_by_bios)(void);             /* __init */
 454         void (*hardware_enable)(void *dummy);      /* __init */
 455         void (*hardware_disable)(void *dummy);
 456         void (*check_processor_compatibility)(void *rtn);
 457         int (*hardware_setup)(void);               /* __init */
 458         void (*hardware_unsetup)(void);            /* __exit */
 459
 460         /* Create, but do not attach this VCPU */
 461         struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
 462         void (*vcpu_free)(struct kvm_vcpu *vcpu);
 463         void (*vcpu_reset)(struct kvm_vcpu *vcpu);
 464
 465         void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
 466         void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 467         void (*vcpu_put)(struct kvm_vcpu *vcpu);
 468         void (*vcpu_decache)(struct kvm_vcpu *vcpu);
 469
 470         int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 471                                struct kvm_debug_guest *dbg);
 472         void (*guest_debug_pre)(struct kvm_vcpu *vcpu);
 473         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 474         int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 475         u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 476         void (*get_segment)(struct kvm_vcpu *vcpu,
 477                             struct kvm_segment *var, int seg);
 478         void (*set_segment)(struct kvm_vcpu *vcpu,
 479                             struct kvm_segment *var, int seg);
 480         void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 481         void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 482         void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 483         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 484         void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 485         void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 486         void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 487         void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 488         void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 489         void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 490         unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 491         void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 492                        int *exception);
 493         void (*cache_regs)(struct kvm_vcpu *vcpu);
 494         void (*decache_regs)(struct kvm_vcpu *vcpu);
 495         unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 496         void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
 497
 498         void (*tlb_flush)(struct kvm_vcpu *vcpu);
 499         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 500                                   unsigned long addr, u32 err_code);
 501
 502         void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
 503
 504         void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 505         int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 506         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 507         void (*patch_hypercall)(struct kvm_vcpu *vcpu,
 508                                 unsigned char *hypercall_addr);
 509         int (*get_irq)(struct kvm_vcpu *vcpu);
 510         void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
 511         void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
 512         void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
 513                                        struct kvm_run *run);
 514 };
 515
 516 extern struct kvm_x86_ops *kvm_x86_ops;
 517
 518 /* The guest did something we don't support. */
 519 #define pr_unimpl(vcpu, fmt, ...)                                       \
 520  do {                                                                   \
 521         if (printk_ratelimit())                                         \
 522                 printk(KERN_ERR "kvm: %i: cpu%i " fmt,                  \
 523                        current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 524  } while(0)
 525
 526 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 527 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
 528
 529 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 530 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 531
 532 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
 533                   struct module *module);
 534 void kvm_exit_x86(void);
 535
 536 int kvm_mmu_module_init(void);
 537 void kvm_mmu_module_exit(void);
 538
 539 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 540 int kvm_mmu_create(struct kvm_vcpu *vcpu);
 541 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
 542 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
 543
 544 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 545 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
 546 void kvm_mmu_zap_all(struct kvm *kvm);
 547
 548 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 549 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 550 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 551 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 552 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
 553 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
 554
 555 extern hpa_t bad_page_address;
 556
 557 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 558 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 559 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
 560
 561 enum emulation_result {
 562         EMULATE_DONE,       /* no further processing */
 563         EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 564         EMULATE_FAIL,         /* can't emulate this instruction */
 565 };
 566
 567 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 568                         unsigned long cr2, u16 error_code, int no_decode);
 569 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
 570 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 571 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 572 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 573                    unsigned long *rflags);
 574
 575 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 576 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 577                      unsigned long *rflags);
 578 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
 579 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 580
 581 struct x86_emulate_ctxt;
 582
 583 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 584                      int size, unsigned port);
 585 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 586                            int size, unsigned long count, int down,
 587                             gva_t address, int rep, unsigned port);
 588 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 589 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 590 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 591 int emulate_clts(struct kvm_vcpu *vcpu);
 592 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 593                     unsigned long *dest);
 594 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 595                     unsigned long value);
 596
 597 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 598 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 599 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 600 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 601 unsigned long get_cr8(struct kvm_vcpu *vcpu);
 602 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
 603 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
 604
 605 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 606 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 607
 608 void fx_init(struct kvm_vcpu *vcpu);
 609
 610 void kvm_resched(struct kvm_vcpu *vcpu);
 611 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
 612 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
 613 void kvm_flush_remote_tlbs(struct kvm *kvm);
 614
 615 int emulator_read_std(unsigned long addr,
 616                       void *val,
 617                       unsigned int bytes,
 618                       struct kvm_vcpu *vcpu);
 619 int emulator_write_emulated(unsigned long addr,
 620                             const void *val,
 621                             unsigned int bytes,
 622                             struct kvm_vcpu *vcpu);
 623
 624 unsigned long segment_base(u16 selector);
 625
 626 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 627                        const u8 *new, int bytes);
 628 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
 629 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
 630 int kvm_mmu_load(struct kvm_vcpu *vcpu);
 631 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 632
 633 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 634
 635 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 636
 637 static inline void kvm_guest_enter(void)
 638 {
 639         current->flags |= PF_VCPU;
 640 }
 641
 642 static inline void kvm_guest_exit(void)
 643 {
 644         current->flags &= ~PF_VCPU;
 645 }
 646
 647 static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
 648                                      u32 error_code)
 649 {
 650         return vcpu->mmu.page_fault(vcpu, gva, error_code);
 651 }
 652
 653 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
 654 {
 655         if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
 656                 __kvm_mmu_free_some_pages(vcpu);
 657 }
 658
 659 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 660 {
 661         if (likely(vcpu->mmu.root_hpa != INVALID_PAGE))
 662                 return 0;
 663
 664         return kvm_mmu_load(vcpu);
 665 }
 666
 667 static inline int is_long_mode(struct kvm_vcpu *vcpu)
 668 {
 669 #ifdef CONFIG_X86_64
 670         return vcpu->shadow_efer & EFER_LME;
 671 #else
 672         return 0;
 673 #endif
 674 }
 675
 676 static inline int is_pae(struct kvm_vcpu *vcpu)
 677 {
 678         return vcpu->cr4 & X86_CR4_PAE;
 679 }
 680
 681 static inline int is_pse(struct kvm_vcpu *vcpu)
 682 {
 683         return vcpu->cr4 & X86_CR4_PSE;
 684 }
 685
 686 static inline int is_paging(struct kvm_vcpu *vcpu)
 687 {
 688         return vcpu->cr0 & X86_CR0_PG;
 689 }
 690
 691 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 692 {
 693         return slot - kvm->memslots;
 694 }
 695
 696 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 697 {
 698         struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
 699
 700         return (struct kvm_mmu_page *)page_private(page);
 701 }
 702
 703 static inline u16 read_fs(void)
 704 {
 705         u16 seg;
 706         asm ("mov %%fs, %0" : "=g"(seg));
 707         return seg;
 708 }
 709
 710 static inline u16 read_gs(void)
 711 {
 712         u16 seg;
 713         asm ("mov %%gs, %0" : "=g"(seg));
 714         return seg;
 715 }
 716
 717 static inline u16 read_ldt(void)
 718 {
 719         u16 ldt;
 720         asm ("sldt %0" : "=g"(ldt));
 721         return ldt;
 722 }
 723
 724 static inline void load_fs(u16 sel)
 725 {
 726         asm ("mov %0, %%fs" : : "rm"(sel));
 727 }
 728
 729 static inline void load_gs(u16 sel)
 730 {
 731         asm ("mov %0, %%gs" : : "rm"(sel));
 732 }
 733
 734 #ifndef load_ldt
 735 static inline void load_ldt(u16 sel)
 736 {
 737         asm ("lldt %0" : : "rm"(sel));
 738 }
 739 #endif
 740
 741 static inline void get_idt(struct descriptor_table *table)
 742 {
 743         asm ("sidt %0" : "=m"(*table));
 744 }
 745
 746 static inline void get_gdt(struct descriptor_table *table)
 747 {
 748         asm ("sgdt %0" : "=m"(*table));
 749 }
 750
 751 static inline unsigned long read_tr_base(void)
 752 {
 753         u16 tr;
 754         asm ("str %0" : "=g"(tr));
 755         return segment_base(tr);
 756 }
 757
 758 #ifdef CONFIG_X86_64
 759 static inline unsigned long read_msr(unsigned long msr)
 760 {
 761         u64 value;
 762
 763         rdmsrl(msr, value);
 764         return value;
 765 }
 766 #endif
 767
 768 static inline void fx_save(struct i387_fxsave_struct *image)
 769 {
 770         asm ("fxsave (%0)":: "r" (image));
 771 }
 772
 773 static inline void fx_restore(struct i387_fxsave_struct *image)
 774 {
 775         asm ("fxrstor (%0)":: "r" (image));
 776 }
 777
 778 static inline void fpu_init(void)
 779 {
 780         asm ("finit");
 781 }
 782
 783 static inline u32 get_rdx_init_val(void)
 784 {
 785         return 0x600; /* P6 family */
 786 }
 787
 788 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 789 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 790 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 791 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 792 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 793 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 794 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 795 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 796 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"
 797
 798 #define MSR_IA32_TIME_STAMP_COUNTER             0x010
 799
 800 #define TSS_IOPB_BASE_OFFSET 0x66
 801 #define TSS_BASE_SIZE 0x68
 802 #define TSS_IOPB_SIZE (65536 / 8)
 803 #define TSS_REDIRECTION_SIZE (256 / 8)
 804 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
 805
 806 #endif