[mirror_ubuntu-zesty-kernel.git] / drivers / kvm / kvm.h

#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>
#include <linux/kvm_para.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 KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 40

#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

#define KVM_PIO_PAGE_OFFSET 1

/*
 * 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;

#define NR_PTE_CHAIN_ENTRIES 5

struct kvm_pte_chain {
	u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
	struct hlist_node link;
};

/*
 * kvm_mmu_page_role, below, is defined as:
 *
 *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 *   bits 4:7 - page table level for this shadow (1-4)
 *   bits 8:9 - page table quadrant for 2-level guests
 *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
 *   bits 17:18 - "access" - the user and writable bits of a huge page pde
 */
union kvm_mmu_page_role {
	unsigned word;
	struct {
		unsigned glevels : 4;
		unsigned level : 4;
		unsigned quadrant : 2;
		unsigned pad_for_nice_hex_output : 6;
		unsigned metaphysical : 1;
		unsigned hugepage_access : 2;
	};
};

struct kvm_mmu_page {
	struct list_head link;
	struct hlist_node hash_link;

	/*
	 * The following two entries are used to key the shadow page in the
	 * hash table.
	 */
	gfn_t gfn;
	union kvm_mmu_page_role role;

	hpa_t page_hpa;
	unsigned long slot_bitmap; /* One bit set per slot which has memory
				    * in this shadow page.
				    */
	int multimapped;         /* More than one parent_pte? */
	int root_count;          /* Currently serving as active root */
	union {
		u64 *parent_pte;               /* !multimapped */
		struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
	};
};

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 (*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;

	u64 *pae_root;
};

#define KVM_NR_MEM_OBJS 20

struct kvm_mmu_memory_cache {
	int nobjs;
	void *objects[KVM_NR_MEM_OBJS];
};

/*
 * We don't want allocation failures within the mmu code, so we preallocate
 * enough memory for a single page fault in a cache.
 */
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 CONFIG_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_pio_request {
	unsigned long count;
	int cur_count;
	struct page *guest_pages[2];
	unsigned guest_page_offset;
	int in;
	int size;
	int string;
	int down;
	int rep;
};

struct kvm_vcpu {
	struct kvm *kvm;
	union {
		struct vmcs *vmcs;
		struct vcpu_svm *svm;
	};
	struct mutex mutex;
	int   cpu;
	int   launched;
	struct kvm_run *run;
	int interrupt_window_open;
	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;
	gpa_t para_state_gpa;
	struct page *para_state_page;
	gpa_t hypercall_gpa;
	unsigned long cr4;
	unsigned long cr8;
	u64 pdptrs[4]; /* pae */
	u64 shadow_efer;
	u64 apic_base;
	u64 ia32_misc_enable_msr;
	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_mmu_memory_cache mmu_pte_chain_cache;
	struct kvm_mmu_memory_cache mmu_rmap_desc_cache;

	gfn_t last_pt_write_gfn;
	int   last_pt_write_count;

	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 kvm_pio_request pio;
	void *pio_data;

	int sigset_active;
	sigset_t sigset;

	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;

	int cpuid_nent;
	struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
};

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];
	/*
	 * Hash table of struct kvm_mmu_page.
	 */
	struct list_head active_mmu_pages;
	int n_free_mmu_pages;
	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
	struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
	int memory_config_version;
	int busy;
	unsigned long rmap_overflow;
	struct list_head vm_list;
	struct file *filp;
};

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_window_exits;
	u32 halt_exits;
	u32 request_irq_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);

	void (*vcpu_load)(struct kvm_vcpu *vcpu);
	void (*vcpu_put)(struct kvm_vcpu *vcpu);
	void (*vcpu_decache)(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);
	void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
	void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
	void (*set_cr0)(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);
	void (*patch_hypercall)(struct kvm_vcpu *vcpu,
				unsigned char *hypercall_addr);
};

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_create(struct kvm_vcpu *vcpu);
int kvm_mmu_setup(struct kvm_vcpu *vcpu);

int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, 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);
struct page *gva_to_page(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 kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
		  int size, unsigned long count, int string, int down,
		  gva_t address, int rep, unsigned port);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
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);

int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);

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);

void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);

int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);

static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
				     u32 error_code)
{
	if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
		kvm_mmu_free_some_pages(vcpu);
	return vcpu->mmu.page_fault(vcpu, gva, error_code);
}

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_long_mode(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_X86_64
	return vcpu->shadow_efer & EFER_LME;
#else
	return 0;
#endif
}

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(page);
}

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" : : "rm"(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 CONFIG_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)

#endif
Commit	Line	Data
6aa8b732 AK	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>
102d8325	17	#include <linux/kvm_para.h>
6aa8b732 AK	18
	19	#define CR0_PE_MASK (1ULL << 0)
	20	#define CR0_TS_MASK (1ULL << 3)
	21	#define CR0_NE_MASK (1ULL << 5)
	22	#define CR0_WP_MASK (1ULL << 16)
	23	#define CR0_NW_MASK (1ULL << 29)
	24	#define CR0_CD_MASK (1ULL << 30)
	25	#define CR0_PG_MASK (1ULL << 31)
	26
	27	#define CR3_WPT_MASK (1ULL << 3)
	28	#define CR3_PCD_MASK (1ULL << 4)
	29
	30	#define CR3_RESEVED_BITS 0x07ULL
	31	#define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) \| 0x0fe7ULL)
	32	#define CR3_FLAGS_MASK ((1ULL << 5) - 1)
	33
	34	#define CR4_VME_MASK (1ULL << 0)
	35	#define CR4_PSE_MASK (1ULL << 4)
	36	#define CR4_PAE_MASK (1ULL << 5)
	37	#define CR4_PGE_MASK (1ULL << 7)
	38	#define CR4_VMXE_MASK (1ULL << 13)
	39
	40	#define KVM_GUEST_CR0_MASK \
	41	(CR0_PG_MASK \| CR0_PE_MASK \| CR0_WP_MASK \| CR0_NE_MASK \
	42	\| CR0_NW_MASK \| CR0_CD_MASK)
	43	#define KVM_VM_CR0_ALWAYS_ON \
	44	(CR0_PG_MASK \| CR0_PE_MASK \| CR0_WP_MASK \| CR0_NE_MASK)
	45	#define KVM_GUEST_CR4_MASK \
	46	(CR4_PSE_MASK \| CR4_PAE_MASK \| CR4_PGE_MASK \| CR4_VMXE_MASK \| CR4_VME_MASK)
	47	#define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK \| CR4_PAE_MASK)
	48	#define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK \| CR4_PAE_MASK \| CR4_VME_MASK)
	49
	50	#define INVALID_PAGE (~(hpa_t)0)
	51	#define UNMAPPED_GVA (~(gpa_t)0)
	52
	53	#define KVM_MAX_VCPUS 1
	54	#define KVM_MEMORY_SLOTS 4
	55	#define KVM_NUM_MMU_PAGES 256
ebeace86 AK	56	#define KVM_MIN_FREE_MMU_PAGES 5
ebeace86 AK	57	#define KVM_REFILL_PAGES 25
06465c5a	58	#define KVM_MAX_CPUID_ENTRIES 40
6aa8b732 AK	59
	60	#define FX_IMAGE_SIZE 512
	61	#define FX_IMAGE_ALIGN 16
	62	#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
	63
	64	#define DE_VECTOR 0
	65	#define DF_VECTOR 8
	66	#define TS_VECTOR 10
	67	#define NP_VECTOR 11
	68	#define SS_VECTOR 12
	69	#define GP_VECTOR 13
	70	#define PF_VECTOR 14
	71
	72	#define SELECTOR_TI_MASK (1 << 2)
	73	#define SELECTOR_RPL_MASK 0x03
	74
	75	#define IOPL_SHIFT 12
	76
039576c0 AK	77	#define KVM_PIO_PAGE_OFFSET 1
039576c0 AK	78
6aa8b732 AK	79	/*
	80	* Address types:
	81	*
	82	* gva - guest virtual address
	83	* gpa - guest physical address
	84	* gfn - guest frame number
	85	* hva - host virtual address
	86	* hpa - host physical address
	87	* hfn - host frame number
	88	*/
	89
	90	typedef unsigned long gva_t;
	91	typedef u64 gpa_t;
	92	typedef unsigned long gfn_t;
	93
	94	typedef unsigned long hva_t;
	95	typedef u64 hpa_t;
	96	typedef unsigned long hfn_t;
	97
cea0f0e7 AK	98	#define NR_PTE_CHAIN_ENTRIES 5
	99
	100	struct kvm_pte_chain {
	101	u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
	102	struct hlist_node link;
	103	};
	104
	105	/*
	106	* kvm_mmu_page_role, below, is defined as:
	107	*
	108	* bits 0:3 - total guest paging levels (2-4, or zero for real mode)
	109	* bits 4:7 - page table level for this shadow (1-4)
	110	* bits 8:9 - page table quadrant for 2-level guests
	111	* bit 16 - "metaphysical" - gfn is not a real page (huge page/real mode)
d28c6cfb	112	* bits 17:18 - "access" - the user and writable bits of a huge page pde
cea0f0e7 AK	113	*/
	114	union kvm_mmu_page_role {
	115	unsigned word;
	116	struct {
	117	unsigned glevels : 4;
	118	unsigned level : 4;
	119	unsigned quadrant : 2;
	120	unsigned pad_for_nice_hex_output : 6;
	121	unsigned metaphysical : 1;
d28c6cfb	122	unsigned hugepage_access : 2;
cea0f0e7 AK	123	};
	124	};
	125
6aa8b732 AK	126	struct kvm_mmu_page {
6aa8b732 AK	127	struct list_head link;
cea0f0e7 AK	128	struct hlist_node hash_link;
	129
	130	/*
	131	* The following two entries are used to key the shadow page in the
	132	* hash table.
	133	*/
	134	gfn_t gfn;
	135	union kvm_mmu_page_role role;
	136
6aa8b732 AK	137	hpa_t page_hpa;
	138	unsigned long slot_bitmap; /* One bit set per slot which has memory
	139	* in this shadow page.
	140	*/
cea0f0e7	141	int multimapped; /* More than one parent_pte? */
3bb65a22	142	int root_count; /* Currently serving as active root */
cea0f0e7 AK	143	union {
	144	u64 parent_pte; / !multimapped */
	145	struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
	146	};
6aa8b732 AK	147	};
	148
	149	struct vmcs {
	150	u32 revision_id;
	151	u32 abort;
	152	char data[0];
	153	};
	154
	155	#define vmx_msr_entry kvm_msr_entry
	156
	157	struct kvm_vcpu;
	158
	159	/*
	160	* x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
	161	* 32-bit). The kvm_mmu structure abstracts the details of the current mmu
	162	* mode.
	163	*/
	164	struct kvm_mmu {
	165	void (new_cr3)(struct kvm_vcpu vcpu);
	166	int (page_fault)(struct kvm_vcpu vcpu, gva_t gva, u32 err);
6aa8b732 AK	167	void (free)(struct kvm_vcpu vcpu);
	168	gpa_t (gva_to_gpa)(struct kvm_vcpu vcpu, gva_t gva);
	169	hpa_t root_hpa;
	170	int root_level;
	171	int shadow_root_level;
17ac10ad AK	172
17ac10ad AK	173	u64 *pae_root;
6aa8b732 AK	174	};
6aa8b732 AK	175
714b93da AK	176	#define KVM_NR_MEM_OBJS 20
	177
	178	struct kvm_mmu_memory_cache {
	179	int nobjs;
	180	void *objects[KVM_NR_MEM_OBJS];
	181	};
	182
	183	/*
	184	* We don't want allocation failures within the mmu code, so we preallocate
	185	* enough memory for a single page fault in a cache.
	186	*/
6aa8b732 AK	187	struct kvm_guest_debug {
	188	int enabled;
	189	unsigned long bp[4];
	190	int singlestep;
	191	};
	192
	193	enum {
	194	VCPU_REGS_RAX = 0,
	195	VCPU_REGS_RCX = 1,
	196	VCPU_REGS_RDX = 2,
	197	VCPU_REGS_RBX = 3,
	198	VCPU_REGS_RSP = 4,
	199	VCPU_REGS_RBP = 5,
	200	VCPU_REGS_RSI = 6,
	201	VCPU_REGS_RDI = 7,
05b3e0c2	202	#ifdef CONFIG_X86_64
6aa8b732 AK	203	VCPU_REGS_R8 = 8,
	204	VCPU_REGS_R9 = 9,
	205	VCPU_REGS_R10 = 10,
	206	VCPU_REGS_R11 = 11,
	207	VCPU_REGS_R12 = 12,
	208	VCPU_REGS_R13 = 13,
	209	VCPU_REGS_R14 = 14,
	210	VCPU_REGS_R15 = 15,
	211	#endif
	212	NR_VCPU_REGS
	213	};
	214
	215	enum {
	216	VCPU_SREG_CS,
	217	VCPU_SREG_DS,
	218	VCPU_SREG_ES,
	219	VCPU_SREG_FS,
	220	VCPU_SREG_GS,
	221	VCPU_SREG_SS,
	222	VCPU_SREG_TR,
	223	VCPU_SREG_LDTR,
	224	};
	225
039576c0 AK	226	struct kvm_pio_request {
	227	unsigned long count;
	228	int cur_count;
	229	struct page *guest_pages[2];
	230	unsigned guest_page_offset;
	231	int in;
	232	int size;
	233	int string;
	234	int down;
	235	int rep;
	236	};
	237
6aa8b732 AK	238	struct kvm_vcpu {
	239	struct kvm *kvm;
	240	union {
	241	struct vmcs *vmcs;
	242	struct vcpu_svm *svm;
	243	};
	244	struct mutex mutex;
	245	int cpu;
	246	int launched;
9a2bb7f4	247	struct kvm_run *run;
c1150d8c	248	int interrupt_window_open;
6aa8b732 AK	249	unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
	250	#define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
	251	unsigned long irq_pending[NR_IRQ_WORDS];
	252	unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
	253	unsigned long rip; /* needs vcpu_load_rsp_rip() */
	254
	255	unsigned long cr0;
	256	unsigned long cr2;
	257	unsigned long cr3;
102d8325 IM	258	gpa_t para_state_gpa;
	259	struct page *para_state_page;
	260	gpa_t hypercall_gpa;
6aa8b732 AK	261	unsigned long cr4;
6aa8b732 AK	262	unsigned long cr8;
1342d353	263	u64 pdptrs[4]; /* pae */
6aa8b732 AK	264	u64 shadow_efer;
6aa8b732 AK	265	u64 apic_base;
6f00e68f	266	u64 ia32_misc_enable_msr;
6aa8b732 AK	267	int nmsrs;
	268	struct vmx_msr_entry *guest_msrs;
	269	struct vmx_msr_entry *host_msrs;
	270
	271	struct list_head free_pages;
	272	struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
	273	struct kvm_mmu mmu;
	274
714b93da AK	275	struct kvm_mmu_memory_cache mmu_pte_chain_cache;
	276	struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
	277
86a5ba02 AK	278	gfn_t last_pt_write_gfn;
	279	int last_pt_write_count;
	280
6aa8b732 AK	281	struct kvm_guest_debug guest_debug;
	282
	283	char fx_buf[FX_BUF_SIZE];
	284	char *host_fx_image;
	285	char *guest_fx_image;
	286
	287	int mmio_needed;
	288	int mmio_read_completed;
	289	int mmio_is_write;
	290	int mmio_size;
	291	unsigned char mmio_data[8];
	292	gpa_t mmio_phys_addr;
039576c0 AK	293	struct kvm_pio_request pio;
039576c0 AK	294	void *pio_data;
6aa8b732	295
1961d276 AK	296	int sigset_active;
	297	sigset_t sigset;
	298
6aa8b732 AK	299	struct {
	300	int active;
	301	u8 save_iopl;
	302	struct kvm_save_segment {
	303	u16 selector;
	304	unsigned long base;
	305	u32 limit;
	306	u32 ar;
	307	} tr, es, ds, fs, gs;
	308	} rmode;
06465c5a AK	309
	310	int cpuid_nent;
	311	struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
6aa8b732 AK	312	};
	313
	314	struct kvm_memory_slot {
	315	gfn_t base_gfn;
	316	unsigned long npages;
	317	unsigned long flags;
	318	struct page **phys_mem;
	319	unsigned long *dirty_bitmap;
	320	};
	321
	322	struct kvm {
	323	spinlock_t lock; /* protects everything except vcpus */
	324	int nmemslots;
	325	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
cea0f0e7 AK	326	/*
	327	* Hash table of struct kvm_mmu_page.
	328	*/
6aa8b732	329	struct list_head active_mmu_pages;
ebeace86	330	int n_free_mmu_pages;
cea0f0e7	331	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
6aa8b732 AK	332	struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
	333	int memory_config_version;
	334	int busy;
cd4a4e53	335	unsigned long rmap_overflow;
133de902	336	struct list_head vm_list;
bccf2150	337	struct file *filp;
6aa8b732 AK	338	};
	339
	340	struct kvm_stat {
	341	u32 pf_fixed;
	342	u32 pf_guest;
	343	u32 tlb_flush;
	344	u32 invlpg;
	345
	346	u32 exits;
	347	u32 io_exits;
	348	u32 mmio_exits;
	349	u32 signal_exits;
c1150d8c DL	350	u32 irq_window_exits;
	351	u32 halt_exits;
	352	u32 request_irq_exits;
6aa8b732 AK	353	u32 irq_exits;
	354	};
	355
	356	struct descriptor_table {
	357	u16 limit;
	358	unsigned long base;
	359	} __attribute__((packed));
	360
	361	struct kvm_arch_ops {
	362	int (cpu_has_kvm_support)(void); / __init */
	363	int (disabled_by_bios)(void); / __init */
	364	void (hardware_enable)(void dummy); /* __init */
	365	void (hardware_disable)(void dummy);
	366	int (hardware_setup)(void); / __init */
	367	void (hardware_unsetup)(void); / __exit */
	368
	369	int (vcpu_create)(struct kvm_vcpu vcpu);
	370	void (vcpu_free)(struct kvm_vcpu vcpu);
	371
bccf2150	372	void (vcpu_load)(struct kvm_vcpu vcpu);
6aa8b732	373	void (vcpu_put)(struct kvm_vcpu vcpu);
774c47f1	374	void (vcpu_decache)(struct kvm_vcpu vcpu);
6aa8b732 AK	375
	376	int (set_guest_debug)(struct kvm_vcpu vcpu,
	377	struct kvm_debug_guest *dbg);
	378	int (get_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 *pdata);
	379	int (set_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 data);
	380	u64 (get_segment_base)(struct kvm_vcpu vcpu, int seg);
	381	void (get_segment)(struct kvm_vcpu vcpu,
	382	struct kvm_segment *var, int seg);
	383	void (set_segment)(struct kvm_vcpu vcpu,
	384	struct kvm_segment *var, int seg);
6aa8b732	385	void (get_cs_db_l_bits)(struct kvm_vcpu vcpu, int db, int l);
399badf3	386	void (decache_cr0_cr4_guest_bits)(struct kvm_vcpu vcpu);
6aa8b732	387	void (set_cr0)(struct kvm_vcpu vcpu, unsigned long cr0);
6aa8b732 AK	388	void (set_cr3)(struct kvm_vcpu vcpu, unsigned long cr3);
	389	void (set_cr4)(struct kvm_vcpu vcpu, unsigned long cr4);
	390	void (set_efer)(struct kvm_vcpu vcpu, u64 efer);
	391	void (get_idt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	392	void (set_idt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	393	void (get_gdt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	394	void (set_gdt)(struct kvm_vcpu vcpu, struct descriptor_table *dt);
	395	unsigned long (get_dr)(struct kvm_vcpu vcpu, int dr);
	396	void (set_dr)(struct kvm_vcpu vcpu, int dr, unsigned long value,
	397	int *exception);
	398	void (cache_regs)(struct kvm_vcpu vcpu);
	399	void (decache_regs)(struct kvm_vcpu vcpu);
	400	unsigned long (get_rflags)(struct kvm_vcpu vcpu);
	401	void (set_rflags)(struct kvm_vcpu vcpu, unsigned long rflags);
	402
	403	void (invlpg)(struct kvm_vcpu vcpu, gva_t addr);
	404	void (tlb_flush)(struct kvm_vcpu vcpu);
	405	void (inject_page_fault)(struct kvm_vcpu vcpu,
	406	unsigned long addr, u32 err_code);
	407
	408	void (inject_gp)(struct kvm_vcpu vcpu, unsigned err_code);
	409
	410	int (run)(struct kvm_vcpu vcpu, struct kvm_run *run);
	411	int (vcpu_setup)(struct kvm_vcpu vcpu);
	412	void (skip_emulated_instruction)(struct kvm_vcpu vcpu);
102d8325 IM	413	void (patch_hypercall)(struct kvm_vcpu vcpu,
102d8325 IM	414	unsigned char *hypercall_addr);
6aa8b732 AK	415	};
	416
	417	extern struct kvm_stat kvm_stat;
	418	extern struct kvm_arch_ops *kvm_arch_ops;
	419
	420	#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
	421	#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
	422
	423	int kvm_init_arch(struct kvm_arch_ops ops, struct module module);
	424	void kvm_exit_arch(void);
	425
	426	void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
8018c27b IM	427	int kvm_mmu_create(struct kvm_vcpu *vcpu);
8018c27b IM	428	int kvm_mmu_setup(struct kvm_vcpu *vcpu);
6aa8b732 AK	429
6aa8b732 AK	430	int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
714b93da	431	void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
6aa8b732 AK	432
	433	hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
	434	#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
	435	#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
	436	static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
	437	hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
039576c0	438	struct page gva_to_page(struct kvm_vcpu vcpu, gva_t gva);
6aa8b732 AK	439
	440	void kvm_emulator_want_group7_invlpg(void);
	441
	442	extern hpa_t bad_page_address;
	443
	444	static inline struct page gfn_to_page(struct kvm_memory_slot slot, gfn_t gfn)
	445	{
	446	return slot->phys_mem[gfn - slot->base_gfn];
	447	}
	448
	449	struct kvm_memory_slot gfn_to_memslot(struct kvm kvm, gfn_t gfn);
	450	void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
	451
	452	enum emulation_result {
	453	EMULATE_DONE, /* no further processing */
	454	EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
	455	EMULATE_FAIL, /* can't emulate this instruction */
	456	};
	457
	458	int emulate_instruction(struct kvm_vcpu vcpu, struct kvm_run run,
	459	unsigned long cr2, u16 error_code);
	460	void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
	461	void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
	462	void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
	463	unsigned long *rflags);
	464
	465	unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
	466	void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
	467	unsigned long *rflags);
	468
	469	struct x86_emulate_ctxt;
	470
039576c0 AK	471	int kvm_setup_pio(struct kvm_vcpu vcpu, struct kvm_run run, int in,
	472	int size, unsigned long count, int string, int down,
	473	gva_t address, int rep, unsigned port);
06465c5a	474	void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
6aa8b732 AK	475	int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
	476	int emulate_clts(struct kvm_vcpu *vcpu);
	477	int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
	478	unsigned long *dest);
	479	int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
	480	unsigned long value);
	481
	482	void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
	483	void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
	484	void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
	485	void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
	486	void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
	487
3bab1f5d AK	488	int kvm_get_msr_common(struct kvm_vcpu vcpu, u32 msr, u64 pdata);
3bab1f5d AK	489	int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
6aa8b732 AK	490
	491	void fx_init(struct kvm_vcpu *vcpu);
	492
	493	void load_msrs(struct vmx_msr_entry *e, int n);
	494	void save_msrs(struct vmx_msr_entry *e, int n);
	495	void kvm_resched(struct kvm_vcpu *vcpu);
	496
	497	int kvm_read_guest(struct kvm_vcpu *vcpu,
	498	gva_t addr,
	499	unsigned long size,
	500	void *dest);
	501
	502	int kvm_write_guest(struct kvm_vcpu *vcpu,
	503	gva_t addr,
	504	unsigned long size,
	505	void *data);
	506
	507	unsigned long segment_base(u16 selector);
	508
da4a00f0 AK	509	void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
da4a00f0 AK	510	void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
a436036b	511	int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
ebeace86 AK	512	void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
ebeace86 AK	513
270fd9b9 AK	514	int kvm_hypercall(struct kvm_vcpu vcpu, struct kvm_run run);
270fd9b9 AK	515
ebeace86 AK	516	static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
	517	u32 error_code)
	518	{
	519	if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
	520	kvm_mmu_free_some_pages(vcpu);
	521	return vcpu->mmu.page_fault(vcpu, gva, error_code);
	522	}
da4a00f0	523
6aa8b732 AK	524	static inline struct page _gfn_to_page(struct kvm kvm, gfn_t gfn)
	525	{
	526	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
	527	return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
	528	}
	529
a9058ecd AK	530	static inline int is_long_mode(struct kvm_vcpu *vcpu)
	531	{
	532	#ifdef CONFIG_X86_64
	533	return vcpu->shadow_efer & EFER_LME;
	534	#else
	535	return 0;
	536	#endif
	537	}
	538
6aa8b732 AK	539	static inline int is_pae(struct kvm_vcpu *vcpu)
	540	{
	541	return vcpu->cr4 & CR4_PAE_MASK;
	542	}
	543
	544	static inline int is_pse(struct kvm_vcpu *vcpu)
	545	{
	546	return vcpu->cr4 & CR4_PSE_MASK;
	547	}
	548
	549	static inline int is_paging(struct kvm_vcpu *vcpu)
	550	{
	551	return vcpu->cr0 & CR0_PG_MASK;
	552	}
	553
	554	static inline int memslot_id(struct kvm kvm, struct kvm_memory_slot slot)
	555	{
	556	return slot - kvm->memslots;
	557	}
	558
	559	static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
	560	{
	561	struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
	562
5972e953	563	return (struct kvm_mmu_page *)page_private(page);
6aa8b732 AK	564	}
	565
	566	static inline u16 read_fs(void)
	567	{
	568	u16 seg;
	569	asm ("mov %%fs, %0" : "=g"(seg));
	570	return seg;
	571	}
	572
	573	static inline u16 read_gs(void)
	574	{
	575	u16 seg;
	576	asm ("mov %%gs, %0" : "=g"(seg));
	577	return seg;
	578	}
	579
	580	static inline u16 read_ldt(void)
	581	{
	582	u16 ldt;
	583	asm ("sldt %0" : "=g"(ldt));
	584	return ldt;
	585	}
	586
	587	static inline void load_fs(u16 sel)
	588	{
	589	asm ("mov %0, %%fs" : : "rm"(sel));
	590	}
	591
	592	static inline void load_gs(u16 sel)
	593	{
	594	asm ("mov %0, %%gs" : : "rm"(sel));
	595	}
	596
	597	#ifndef load_ldt
	598	static inline void load_ldt(u16 sel)
	599	{
a0610ddf	600	asm ("lldt %0" : : "rm"(sel));
6aa8b732 AK	601	}
	602	#endif
	603
	604	static inline void get_idt(struct descriptor_table *table)
	605	{
	606	asm ("sidt %0" : "=m"(*table));
	607	}
	608
	609	static inline void get_gdt(struct descriptor_table *table)
	610	{
	611	asm ("sgdt %0" : "=m"(*table));
	612	}
	613
	614	static inline unsigned long read_tr_base(void)
	615	{
	616	u16 tr;
	617	asm ("str %0" : "=g"(tr));
	618	return segment_base(tr);
	619	}
	620
05b3e0c2	621	#ifdef CONFIG_X86_64
6aa8b732 AK	622	static inline unsigned long read_msr(unsigned long msr)
	623	{
	624	u64 value;
	625
	626	rdmsrl(msr, value);
	627	return value;
	628	}
	629	#endif
	630
	631	static inline void fx_save(void *image)
	632	{
	633	asm ("fxsave (%0)":: "r" (image));
	634	}
	635
	636	static inline void fx_restore(void *image)
	637	{
	638	asm ("fxrstor (%0)":: "r" (image));
	639	}
	640
	641	static inline void fpu_init(void)
	642	{
	643	asm ("finit");
	644	}
	645
	646	static inline u32 get_rdx_init_val(void)
	647	{
	648	return 0x600; /* P6 family */
	649	}
	650
	651	#define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
	652	#define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
	653	#define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
	654	#define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
	655	#define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
	656	#define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
	657	#define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
	658	#define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
	659	#define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
	660
	661	#define MSR_IA32_TIME_STAMP_COUNTER 0x010
	662
	663	#define TSS_IOPB_BASE_OFFSET 0x66
	664	#define TSS_BASE_SIZE 0x68
	665	#define TSS_IOPB_SIZE (65536 / 8)
	666	#define TSS_REDIRECTION_SIZE (256 / 8)
	667	#define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
	668
6aa8b732	669	#endif