drivers/kvm/kvm.h - kernel/msm - Gitiles

 #ifndef __KVM_H
 #define __KVM_H

 /*
  * This work is licensed under the terms of the GNU GPL, version 2.  See
  * the COPYING file in the top-level directory.
  */

 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>

 #include "vmx.h"
 #include <linux/kvm.h>

 #define CR0_PE_MASK (1ULL << 0)
 #define CR0_TS_MASK (1ULL << 3)
 #define CR0_NE_MASK (1ULL << 5)
 #define CR0_WP_MASK (1ULL << 16)
 #define CR0_NW_MASK (1ULL << 29)
 #define CR0_CD_MASK (1ULL << 30)
 #define CR0_PG_MASK (1ULL << 31)

 #define CR3_WPT_MASK (1ULL << 3)
 #define CR3_PCD_MASK (1ULL << 4)

 #define CR3_RESEVED_BITS 0x07ULL
 #define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
 #define CR3_FLAGS_MASK ((1ULL << 5) - 1)

 #define CR4_VME_MASK (1ULL << 0)
 #define CR4_PSE_MASK (1ULL << 4)
 #define CR4_PAE_MASK (1ULL << 5)
 #define CR4_PGE_MASK (1ULL << 7)
 #define CR4_VMXE_MASK (1ULL << 13)

 #define KVM_GUEST_CR0_MASK \
 	(CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
 	 | CR0_NW_MASK | CR0_CD_MASK)
 #define KVM_VM_CR0_ALWAYS_ON \
 	(CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
 #define KVM_GUEST_CR4_MASK \
 	(CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
 #define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
 #define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)

 #define INVALID_PAGE (~(hpa_t)0)
 #define UNMAPPED_GVA (~(gpa_t)0)

 #define KVM_MAX_VCPUS 1
 #define KVM_MEMORY_SLOTS 4
 #define KVM_NUM_MMU_PAGES 256

 #define FX_IMAGE_SIZE 512
 #define FX_IMAGE_ALIGN 16
 #define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)

 #define DE_VECTOR 0
 #define DF_VECTOR 8
 #define TS_VECTOR 10
 #define NP_VECTOR 11
 #define SS_VECTOR 12
 #define GP_VECTOR 13
 #define PF_VECTOR 14

 #define SELECTOR_TI_MASK (1 << 2)
 #define SELECTOR_RPL_MASK 0x03

 #define IOPL_SHIFT 12

 /*
  * Address types:
  *
  *  gva - guest virtual address
  *  gpa - guest physical address
  *  gfn - guest frame number
  *  hva - host virtual address
  *  hpa - host physical address
  *  hfn - host frame number
  */

 typedef unsigned long  gva_t;
 typedef u64            gpa_t;
 typedef unsigned long  gfn_t;

 typedef unsigned long  hva_t;
 typedef u64            hpa_t;
 typedef unsigned long  hfn_t;

 struct kvm_mmu_page {
 	struct list_head link;
 	hpa_t page_hpa;
 	unsigned long slot_bitmap; /* One bit set per slot which has memory
 				    * in this shadow page.
 				    */
 	int global;              /* Set if all ptes in this page are global */
 	u64 *parent_pte;
 };

 struct vmcs {
 	u32 revision_id;
 	u32 abort;
 	char data[0];
 };

 #define vmx_msr_entry kvm_msr_entry

 struct kvm_vcpu;

 /*
  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
  * mode.
  */
 struct kvm_mmu {
 	void (*new_cr3)(struct kvm_vcpu *vcpu);
 	int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 	void (*inval_page)(struct kvm_vcpu *vcpu, gva_t gva);
 	void (*free)(struct kvm_vcpu *vcpu);
 	gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
 	hpa_t root_hpa;
 	int root_level;
 	int shadow_root_level;
 };

 struct kvm_guest_debug {
 	int enabled;
 	unsigned long bp[4];
 	int singlestep;
 };

 enum {
 	VCPU_REGS_RAX = 0,
 	VCPU_REGS_RCX = 1,
 	VCPU_REGS_RDX = 2,
 	VCPU_REGS_RBX = 3,
 	VCPU_REGS_RSP = 4,
 	VCPU_REGS_RBP = 5,
 	VCPU_REGS_RSI = 6,
 	VCPU_REGS_RDI = 7,
 #ifdef __x86_64__
 	VCPU_REGS_R8 = 8,
 	VCPU_REGS_R9 = 9,
 	VCPU_REGS_R10 = 10,
 	VCPU_REGS_R11 = 11,
 	VCPU_REGS_R12 = 12,
 	VCPU_REGS_R13 = 13,
 	VCPU_REGS_R14 = 14,
 	VCPU_REGS_R15 = 15,
 #endif
 	NR_VCPU_REGS
 };

 enum {
 	VCPU_SREG_CS,
 	VCPU_SREG_DS,
 	VCPU_SREG_ES,
 	VCPU_SREG_FS,
 	VCPU_SREG_GS,
 	VCPU_SREG_SS,
 	VCPU_SREG_TR,
 	VCPU_SREG_LDTR,
 };

 struct kvm_vcpu {
 	struct kvm *kvm;
 	union {
 		struct vmcs *vmcs;
 		struct vcpu_svm *svm;
 	};
 	struct mutex mutex;
 	int   cpu;
 	int   launched;
 	unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
 #define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
 	unsigned long irq_pending[NR_IRQ_WORDS];
 	unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
 	unsigned long rip;      /* needs vcpu_load_rsp_rip() */

 	unsigned long cr0;
 	unsigned long cr2;
 	unsigned long cr3;
 	unsigned long cr4;
 	unsigned long cr8;
 	u64 shadow_efer;
 	u64 apic_base;
 	int nmsrs;
 	struct vmx_msr_entry *guest_msrs;
 	struct vmx_msr_entry *host_msrs;

 	struct list_head free_pages;
 	struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
 	struct kvm_mmu mmu;

 	struct kvm_guest_debug guest_debug;

 	char fx_buf[FX_BUF_SIZE];
 	char *host_fx_image;
 	char *guest_fx_image;

 	int mmio_needed;
 	int mmio_read_completed;
 	int mmio_is_write;
 	int mmio_size;
 	unsigned char mmio_data[8];
 	gpa_t mmio_phys_addr;

 	struct {
 		int active;
 		u8 save_iopl;
 		struct kvm_save_segment {
 			u16 selector;
 			unsigned long base;
 			u32 limit;
 			u32 ar;
 		} tr, es, ds, fs, gs;
 	} rmode;
 };

 struct kvm_memory_slot {
 	gfn_t base_gfn;
 	unsigned long npages;
 	unsigned long flags;
 	struct page **phys_mem;
 	unsigned long *dirty_bitmap;
 };

 struct kvm {
 	spinlock_t lock; /* protects everything except vcpus */
 	int nmemslots;
 	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
 	struct list_head active_mmu_pages;
 	struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
 	int memory_config_version;
 	int busy;
 };

 struct kvm_stat {
 	u32 pf_fixed;
 	u32 pf_guest;
 	u32 tlb_flush;
 	u32 invlpg;

 	u32 exits;
 	u32 io_exits;
 	u32 mmio_exits;
 	u32 signal_exits;
 	u32 irq_exits;
 };

 struct descriptor_table {
 	u16 limit;
 	unsigned long base;
 } __attribute__((packed));

 struct kvm_arch_ops {
 	int (*cpu_has_kvm_support)(void);          /* __init */
 	int (*disabled_by_bios)(void);             /* __init */
 	void (*hardware_enable)(void *dummy);      /* __init */
 	void (*hardware_disable)(void *dummy);
 	int (*hardware_setup)(void);               /* __init */
 	void (*hardware_unsetup)(void);            /* __exit */

 	int (*vcpu_create)(struct kvm_vcpu *vcpu);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);

 	struct kvm_vcpu *(*vcpu_load)(struct kvm_vcpu *vcpu);
 	void (*vcpu_put)(struct kvm_vcpu *vcpu);

 	int (*set_guest_debug)(struct kvm_vcpu *vcpu,
 			       struct kvm_debug_guest *dbg);
 	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 	u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 	void (*get_segment)(struct kvm_vcpu *vcpu,
 			    struct kvm_segment *var, int seg);
 	void (*set_segment)(struct kvm_vcpu *vcpu,
 			    struct kvm_segment *var, int seg);
 	int (*is_long_mode)(struct kvm_vcpu *vcpu);
 	void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
 	void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 	void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
 				      unsigned long cr0);
 	void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 	void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
 	void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
 	void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
 	unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
 	void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
 		       int *exception);
 	void (*cache_regs)(struct kvm_vcpu *vcpu);
 	void (*decache_regs)(struct kvm_vcpu *vcpu);
 	unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
 	void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);

 	void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
 	void (*tlb_flush)(struct kvm_vcpu *vcpu);
 	void (*inject_page_fault)(struct kvm_vcpu *vcpu,
 				  unsigned long addr, u32 err_code);

 	void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);

 	int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
 	int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 	void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
 };

 extern struct kvm_stat kvm_stat;
 extern struct kvm_arch_ops *kvm_arch_ops;

 #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
 #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)

 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
 void kvm_exit_arch(void);

 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
 int kvm_mmu_init(struct kvm_vcpu *vcpu);

 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);

 hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);

 void kvm_emulator_want_group7_invlpg(void);

 extern hpa_t bad_page_address;

 static inline struct page *gfn_to_page(struct kvm_memory_slot *slot, gfn_t gfn)
 {
 	return slot->phys_mem[gfn - slot->base_gfn];
 }

 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
 void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

 enum emulation_result {
 	EMULATE_DONE,       /* no further processing */
 	EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
 	EMULATE_FAIL,         /* can't emulate this instruction */
 };

 int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
 			unsigned long cr2, u16 error_code);
 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 		   unsigned long *rflags);

 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
 		     unsigned long *rflags);

 struct x86_emulate_ctxt;

 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
 int emulate_clts(struct kvm_vcpu *vcpu);
 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
 		    unsigned long *dest);
 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
 		    unsigned long value);

 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);

 #ifdef __x86_64__
 void set_efer(struct kvm_vcpu *vcpu, u64 efer);
 #endif

 void fx_init(struct kvm_vcpu *vcpu);

 void load_msrs(struct vmx_msr_entry *e, int n);
 void save_msrs(struct vmx_msr_entry *e, int n);
 void kvm_resched(struct kvm_vcpu *vcpu);

 int kvm_read_guest(struct kvm_vcpu *vcpu,
 	       gva_t addr,
 	       unsigned long size,
 	       void *dest);

 int kvm_write_guest(struct kvm_vcpu *vcpu,
 		gva_t addr,
 		unsigned long size,
 		void *data);

 unsigned long segment_base(u16 selector);

 static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
 {
 	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
 	return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
 }

 static inline int is_pae(struct kvm_vcpu *vcpu)
 {
 	return vcpu->cr4 & CR4_PAE_MASK;
 }

 static inline int is_pse(struct kvm_vcpu *vcpu)
 {
 	return vcpu->cr4 & CR4_PSE_MASK;
 }

 static inline int is_paging(struct kvm_vcpu *vcpu)
 {
 	return vcpu->cr0 & CR0_PG_MASK;
 }

 static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
 {
 	return slot - kvm->memslots;
 }

 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
 {
 	struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);

 	return (struct kvm_mmu_page *)page->private;
 }

 static inline u16 read_fs(void)
 {
 	u16 seg;
 	asm ("mov %%fs, %0" : "=g"(seg));
 	return seg;
 }

 static inline u16 read_gs(void)
 {
 	u16 seg;
 	asm ("mov %%gs, %0" : "=g"(seg));
 	return seg;
 }

 static inline u16 read_ldt(void)
 {
 	u16 ldt;
 	asm ("sldt %0" : "=g"(ldt));
 	return ldt;
 }

 static inline void load_fs(u16 sel)
 {
 	asm ("mov %0, %%fs" : : "rm"(sel));
 }

 static inline void load_gs(u16 sel)
 {
 	asm ("mov %0, %%gs" : : "rm"(sel));
 }

 #ifndef load_ldt
 static inline void load_ldt(u16 sel)
 {
 	asm ("lldt %0" : : "g"(sel));
 }
 #endif

 static inline void get_idt(struct descriptor_table *table)
 {
 	asm ("sidt %0" : "=m"(*table));
 }

 static inline void get_gdt(struct descriptor_table *table)
 {
 	asm ("sgdt %0" : "=m"(*table));
 }

 static inline unsigned long read_tr_base(void)
 {
 	u16 tr;
 	asm ("str %0" : "=g"(tr));
 	return segment_base(tr);
 }

 #ifdef __x86_64__
 static inline unsigned long read_msr(unsigned long msr)
 {
 	u64 value;

 	rdmsrl(msr, value);
 	return value;
 }
 #endif

 static inline void fx_save(void *image)
 {
 	asm ("fxsave (%0)":: "r" (image));
 }

 static inline void fx_restore(void *image)
 {
 	asm ("fxrstor (%0)":: "r" (image));
 }

 static inline void fpu_init(void)
 {
 	asm ("finit");
 }

 static inline u32 get_rdx_init_val(void)
 {
 	return 0x600; /* P6 family */
 }

 #define ASM_VMX_VMCLEAR_RAX       ".byte 0x66, 0x0f, 0xc7, 0x30"
 #define ASM_VMX_VMLAUNCH          ".byte 0x0f, 0x01, 0xc2"
 #define ASM_VMX_VMRESUME          ".byte 0x0f, 0x01, 0xc3"
 #define ASM_VMX_VMPTRLD_RAX       ".byte 0x0f, 0xc7, 0x30"
 #define ASM_VMX_VMREAD_RDX_RAX    ".byte 0x0f, 0x78, 0xd0"
 #define ASM_VMX_VMWRITE_RAX_RDX   ".byte 0x0f, 0x79, 0xd0"
 #define ASM_VMX_VMWRITE_RSP_RDX   ".byte 0x0f, 0x79, 0xd4"
 #define ASM_VMX_VMXOFF            ".byte 0x0f, 0x01, 0xc4"
 #define ASM_VMX_VMXON_RAX         ".byte 0xf3, 0x0f, 0xc7, 0x30"

 #define MSR_IA32_TIME_STAMP_COUNTER		0x010

 #define TSS_IOPB_BASE_OFFSET 0x66
 #define TSS_BASE_SIZE 0x68
 #define TSS_IOPB_SIZE (65536 / 8)
 #define TSS_REDIRECTION_SIZE (256 / 8)
 #define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)

 #ifdef __x86_64__

 /*
  * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.  Therefore
  * we need to allocate shadow page tables in the first 4GB of memory, which
  * happens to fit the DMA32 zone.
  */
 #define GFP_KVM_MMU (GFP_KERNEL | __GFP_DMA32)

 #else

 #define GFP_KVM_MMU GFP_KERNEL

 #endif

 #endif
	#ifndef __KVM_H
	#define __KVM_H

	/*
	* This work is licensed under the terms of the GNU GPL, version 2. See
	* the COPYING file in the top-level directory.
	*/

	#include <linux/types.h>
	#include <linux/list.h>
	#include <linux/mutex.h>
	#include <linux/spinlock.h>
	#include <linux/mm.h>

	#include "vmx.h"
	#include <linux/kvm.h>

	#define CR0_PE_MASK (1ULL << 0)
	#define CR0_TS_MASK (1ULL << 3)
	#define CR0_NE_MASK (1ULL << 5)
	#define CR0_WP_MASK (1ULL << 16)
	#define CR0_NW_MASK (1ULL << 29)
	#define CR0_CD_MASK (1ULL << 30)
	#define CR0_PG_MASK (1ULL << 31)

	#define CR3_WPT_MASK (1ULL << 3)
	#define CR3_PCD_MASK (1ULL << 4)

	#define CR3_RESEVED_BITS 0x07ULL
	#define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) \| 0x0fe7ULL)
	#define CR3_FLAGS_MASK ((1ULL << 5) - 1)

	#define CR4_VME_MASK (1ULL << 0)
	#define CR4_PSE_MASK (1ULL << 4)
	#define CR4_PAE_MASK (1ULL << 5)
	#define CR4_PGE_MASK (1ULL << 7)
	#define CR4_VMXE_MASK (1ULL << 13)

	#define KVM_GUEST_CR0_MASK \
	(CR0_PG_MASK \| CR0_PE_MASK \| CR0_WP_MASK \| CR0_NE_MASK \
	\| CR0_NW_MASK \| CR0_CD_MASK)
	#define KVM_VM_CR0_ALWAYS_ON \
	(CR0_PG_MASK \| CR0_PE_MASK \| CR0_WP_MASK \| CR0_NE_MASK)
	#define KVM_GUEST_CR4_MASK \
	(CR4_PSE_MASK \| CR4_PAE_MASK \| CR4_PGE_MASK \| CR4_VMXE_MASK \| CR4_VME_MASK)
	#define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK \| CR4_PAE_MASK)
	#define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK \| CR4_PAE_MASK \| CR4_VME_MASK)

	#define INVALID_PAGE (~(hpa_t)0)
	#define UNMAPPED_GVA (~(gpa_t)0)

	#define KVM_MAX_VCPUS 1
	#define KVM_MEMORY_SLOTS 4
	#define KVM_NUM_MMU_PAGES 256

	#define FX_IMAGE_SIZE 512
	#define FX_IMAGE_ALIGN 16
	#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)

	#define DE_VECTOR 0
	#define DF_VECTOR 8
	#define TS_VECTOR 10
	#define NP_VECTOR 11
	#define SS_VECTOR 12
	#define GP_VECTOR 13
	#define PF_VECTOR 14

	#define SELECTOR_TI_MASK (1 << 2)
	#define SELECTOR_RPL_MASK 0x03

	#define IOPL_SHIFT 12

	/*
	* Address types:
	*
	* gva - guest virtual address
	* gpa - guest physical address
	* gfn - guest frame number
	* hva - host virtual address
	* hpa - host physical address
	* hfn - host frame number
	*/

	typedef unsigned long gva_t;
	typedef u64 gpa_t;
	typedef unsigned long gfn_t;

	typedef unsigned long hva_t;
	typedef u64 hpa_t;
	typedef unsigned long hfn_t;

	struct kvm_mmu_page {
	struct list_head link;
	hpa_t page_hpa;
	unsigned long slot_bitmap; /* One bit set per slot which has memory
	* in this shadow page.
	*/
	int global; /* Set if all ptes in this page are global */
	u64 *parent_pte;
	};

	struct vmcs {
	u32 revision_id;
	u32 abort;
	char data[0];
	};

	#define vmx_msr_entry kvm_msr_entry

	struct kvm_vcpu;

	/*
	* x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
	* 32-bit). The kvm_mmu structure abstracts the details of the current mmu
	* mode.
	*/
	struct kvm_mmu {
	void (new_cr3)(struct kvm_vcpu vcpu);
	int (page_fault)(struct kvm_vcpu vcpu, gva_t gva, u32 err);
	void (inval_page)(struct kvm_vcpu vcpu, gva_t gva);
	void (free)(struct kvm_vcpu vcpu);
	gpa_t (gva_to_gpa)(struct kvm_vcpu vcpu, gva_t gva);
	hpa_t root_hpa;
	int root_level;
	int shadow_root_level;
	};

	struct kvm_guest_debug {
	int enabled;
	unsigned long bp[4];
	int singlestep;
	};

	enum {
	VCPU_REGS_RAX = 0,
	VCPU_REGS_RCX = 1,
	VCPU_REGS_RDX = 2,
	VCPU_REGS_RBX = 3,
	VCPU_REGS_RSP = 4,
	VCPU_REGS_RBP = 5,
	VCPU_REGS_RSI = 6,
	VCPU_REGS_RDI = 7,
	#ifdef __x86_64__
	VCPU_REGS_R8 = 8,
	VCPU_REGS_R9 = 9,
	VCPU_REGS_R10 = 10,
	VCPU_REGS_R11 = 11,
	VCPU_REGS_R12 = 12,
	VCPU_REGS_R13 = 13,
	VCPU_REGS_R14 = 14,
	VCPU_REGS_R15 = 15,
	#endif
	NR_VCPU_REGS
	};

	enum {
	VCPU_SREG_CS,
	VCPU_SREG_DS,
	VCPU_SREG_ES,
	VCPU_SREG_FS,
	VCPU_SREG_GS,
	VCPU_SREG_SS,
	VCPU_SREG_TR,
	VCPU_SREG_LDTR,
	};

	struct kvm_vcpu {
	struct kvm *kvm;
	union {
	struct vmcs *vmcs;
	struct vcpu_svm *svm;
	};
	struct mutex mutex;
	int cpu;
	int launched;
	unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
	#define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
	unsigned long irq_pending[NR_IRQ_WORDS];
	unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
	unsigned long rip; /* needs vcpu_load_rsp_rip() */

	unsigned long cr0;
	unsigned long cr2;
	unsigned long cr3;
	unsigned long cr4;
	unsigned long cr8;
	u64 shadow_efer;
	u64 apic_base;
	int nmsrs;
	struct vmx_msr_entry *guest_msrs;
	struct vmx_msr_entry *host_msrs;

	struct list_head free_pages;
	struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
	struct kvm_mmu mmu;

	struct kvm_guest_debug guest_debug;

	char fx_buf[FX_BUF_SIZE];
	char *host_fx_image;
	char *guest_fx_image;

	int mmio_needed;
	int mmio_read_completed;
	int mmio_is_write;
	int mmio_size;
	unsigned char mmio_data[8];
	gpa_t mmio_phys_addr;

	struct {
	int active;
	u8 save_iopl;
	struct kvm_save_segment {
	u16 selector;
	unsigned long base;
	u32 limit;
	u32 ar;
	} tr, es, ds, fs, gs;
	} rmode;
	};

	struct kvm_memory_slot {
	gfn_t base_gfn;
	unsigned long npages;
	unsigned long flags;
	struct page **phys_mem;
	unsigned long *dirty_bitmap;
	};

	struct kvm {
	spinlock_t lock; /* protects everything except vcpus */
	int nmemslots;
	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
	struct list_head active_mmu_pages;
	struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
	int memory_config_version;
	int busy;
	};

	struct kvm_stat {
	u32 pf_fixed;
	u32 pf_guest;
	u32 tlb_flush;
	u32 invlpg;

	u32 exits;
	u32 io_exits;
	u32 mmio_exits;
	u32 signal_exits;
	u32 irq_exits;
	};

	struct descriptor_table {
	u16 limit;
	unsigned long base;
	} __attribute__((packed));

	struct kvm_arch_ops {
	int (cpu_has_kvm_support)(void); / __init */
	int (disabled_by_bios)(void); / __init */
	void (hardware_enable)(void dummy); /* __init */
	void (hardware_disable)(void dummy);
	int (hardware_setup)(void); / __init */
	void (hardware_unsetup)(void); / __exit */

	int (vcpu_create)(struct kvm_vcpu vcpu);
	void (vcpu_free)(struct kvm_vcpu vcpu);

	struct kvm_vcpu (vcpu_load)(struct kvm_vcpu *vcpu);
	void (vcpu_put)(struct kvm_vcpu vcpu);

	int (set_guest_debug)(struct kvm_vcpu vcpu,
	struct kvm_debug_guest *dbg);
	int (get_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 *pdata);
	int (set_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 data);
	u64 (get_segment_base)(struct kvm_vcpu vcpu, int seg);
	void (get_segment)(struct kvm_vcpu vcpu,
	struct kvm_segment *var, int seg);
	void (set_segment)(struct kvm_vcpu vcpu,
	struct kvm_segment *var, int seg);
	int (is_long_mode)(struct kvm_vcpu vcpu);
	void (get_cs_db_l_bits)(struct kvm_vcpu vcpu, int db, int l);
	void (set_cr0)(struct kvm_vcpu vcpu, unsigned long cr0);
	void (set_cr0_no_modeswitch)(struct kvm_vcpu vcpu,
	unsigned long cr0);
	void (set_cr3)(struct kvm_vcpu vcpu, unsigned long cr3);
	void (set_cr4)(struct kvm_vcpu vcpu, unsigned long cr4);
	void (set_efer)(struct kvm_vcpu vcpu, u64 efer);
	void (get_idt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	void (set_idt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	void (get_gdt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	void (set_gdt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	unsigned long (get_dr)(struct kvm_vcpu vcpu, int dr);
	void (set_dr)(struct kvm_vcpu vcpu, int dr, unsigned long value,
	int *exception);
	void (cache_regs)(struct kvm_vcpu vcpu);
	void (decache_regs)(struct kvm_vcpu vcpu);
	unsigned long (get_rflags)(struct kvm_vcpu vcpu);
	void (set_rflags)(struct kvm_vcpu vcpu, unsigned long rflags);

	void (invlpg)(struct kvm_vcpu vcpu, gva_t addr);
	void (tlb_flush)(struct kvm_vcpu vcpu);
	void (inject_page_fault)(struct kvm_vcpu vcpu,
	unsigned long addr, u32 err_code);

	void (inject_gp)(struct kvm_vcpu vcpu, unsigned err_code);

	int (run)(struct kvm_vcpu vcpu, struct kvm_run *run);
	int (vcpu_setup)(struct kvm_vcpu vcpu);
	void (skip_emulated_instruction)(struct kvm_vcpu vcpu);
	};

	extern struct kvm_stat kvm_stat;
	extern struct kvm_arch_ops *kvm_arch_ops;

	#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
	#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)

	int kvm_init_arch(struct kvm_arch_ops ops, struct module module);
	void kvm_exit_arch(void);

	void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
	int kvm_mmu_init(struct kvm_vcpu *vcpu);

	int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
	void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);

	hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
	#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
	#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
	static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
	hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);

	void kvm_emulator_want_group7_invlpg(void);

	extern hpa_t bad_page_address;

	static inline struct page gfn_to_page(struct kvm_memory_slot slot, gfn_t gfn)
	{
	return slot->phys_mem[gfn - slot->base_gfn];
	}

	struct kvm_memory_slot gfn_to_memslot(struct kvm kvm, gfn_t gfn);
	void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

	enum emulation_result {
	EMULATE_DONE, /* no further processing */
	EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
	EMULATE_FAIL, /* can't emulate this instruction */
	};

	int emulate_instruction(struct kvm_vcpu vcpu, struct kvm_run run,
	unsigned long cr2, u16 error_code);
	void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
	void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
	void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
	unsigned long *rflags);

	unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
	void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
	unsigned long *rflags);

	struct x86_emulate_ctxt;

	int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
	int emulate_clts(struct kvm_vcpu *vcpu);
	int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
	unsigned long *dest);
	int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
	unsigned long value);

	void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
	void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
	void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
	void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
	void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);

	#ifdef __x86_64__
	void set_efer(struct kvm_vcpu *vcpu, u64 efer);
	#endif

	void fx_init(struct kvm_vcpu *vcpu);

	void load_msrs(struct vmx_msr_entry *e, int n);
	void save_msrs(struct vmx_msr_entry *e, int n);
	void kvm_resched(struct kvm_vcpu *vcpu);

	int kvm_read_guest(struct kvm_vcpu *vcpu,
	gva_t addr,
	unsigned long size,
	void *dest);

	int kvm_write_guest(struct kvm_vcpu *vcpu,
	gva_t addr,
	unsigned long size,
	void *data);

	unsigned long segment_base(u16 selector);

	static inline struct page _gfn_to_page(struct kvm kvm, gfn_t gfn)
	{
	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
	return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
	}

	static inline int is_pae(struct kvm_vcpu *vcpu)
	{
	return vcpu->cr4 & CR4_PAE_MASK;
	}

	static inline int is_pse(struct kvm_vcpu *vcpu)
	{
	return vcpu->cr4 & CR4_PSE_MASK;
	}

	static inline int is_paging(struct kvm_vcpu *vcpu)
	{
	return vcpu->cr0 & CR0_PG_MASK;
	}

	static inline int memslot_id(struct kvm kvm, struct kvm_memory_slot slot)
	{
	return slot - kvm->memslots;
	}

	static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
	{
	struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);

	return (struct kvm_mmu_page *)page->private;
	}

	static inline u16 read_fs(void)
	{
	u16 seg;
	asm ("mov %%fs, %0" : "=g"(seg));
	return seg;
	}

	static inline u16 read_gs(void)
	{
	u16 seg;
	asm ("mov %%gs, %0" : "=g"(seg));
	return seg;
	}

	static inline u16 read_ldt(void)
	{
	u16 ldt;
	asm ("sldt %0" : "=g"(ldt));
	return ldt;
	}

	static inline void load_fs(u16 sel)
	{
	asm ("mov %0, %%fs" : : "rm"(sel));
	}

	static inline void load_gs(u16 sel)
	{
	asm ("mov %0, %%gs" : : "rm"(sel));
	}

	#ifndef load_ldt
	static inline void load_ldt(u16 sel)
	{
	asm ("lldt %0" : : "g"(sel));
	}
	#endif

	static inline void get_idt(struct descriptor_table *table)
	{
	asm ("sidt %0" : "=m"(*table));
	}

	static inline void get_gdt(struct descriptor_table *table)
	{
	asm ("sgdt %0" : "=m"(*table));
	}

	static inline unsigned long read_tr_base(void)
	{
	u16 tr;
	asm ("str %0" : "=g"(tr));
	return segment_base(tr);
	}

	#ifdef __x86_64__
	static inline unsigned long read_msr(unsigned long msr)
	{
	u64 value;

	rdmsrl(msr, value);
	return value;
	}
	#endif

	static inline void fx_save(void *image)
	{
	asm ("fxsave (%0)":: "r" (image));
	}

	static inline void fx_restore(void *image)
	{
	asm ("fxrstor (%0)":: "r" (image));
	}

	static inline void fpu_init(void)
	{
	asm ("finit");
	}

	static inline u32 get_rdx_init_val(void)
	{
	return 0x600; /* P6 family */
	}

	#define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
	#define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
	#define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
	#define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
	#define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
	#define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
	#define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
	#define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
	#define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"

	#define MSR_IA32_TIME_STAMP_COUNTER 0x010

	#define TSS_IOPB_BASE_OFFSET 0x66
	#define TSS_BASE_SIZE 0x68
	#define TSS_IOPB_SIZE (65536 / 8)
	#define TSS_REDIRECTION_SIZE (256 / 8)
	#define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)

	#ifdef __x86_64__

	/*
	* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. Therefore
	* we need to allocate shadow page tables in the first 4GB of memory, which
	* happens to fit the DMA32 zone.
	*/
	#define GFP_KVM_MMU (GFP_KERNEL \| __GFP_DMA32)

	#else

	#define GFP_KVM_MMU GFP_KERNEL

	#endif

	#endif