[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / kvm_emulate.h

/******************************************************************************
 * x86_emulate.h
 *
 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
 *
 * Copyright (c) 2005 Keir Fraser
 *
 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
 */

#ifndef _ASM_X86_KVM_X86_EMULATE_H
#define _ASM_X86_KVM_X86_EMULATE_H

#include <asm/desc_defs.h>

struct x86_emulate_ctxt;
enum x86_intercept;
enum x86_intercept_stage;

struct x86_exception {
	u8 vector;
	bool error_code_valid;
	u16 error_code;
	bool nested_page_fault;
	u64 address; /* cr2 or nested page fault gpa */
};

/*
 * This struct is used to carry enough information from the instruction
 * decoder to main KVM so that a decision can be made whether the
 * instruction needs to be intercepted or not.
 */
struct x86_instruction_info {
	u8  intercept;          /* which intercept                      */
	u8  rep_prefix;         /* rep prefix?                          */
	u8  modrm_mod;		/* mod part of modrm			*/
	u8  modrm_reg;          /* index of register used               */
	u8  modrm_rm;		/* rm part of modrm			*/
	u64 src_val;            /* value of source operand              */
	u8  src_bytes;          /* size of source operand               */
	u8  dst_bytes;          /* size of destination operand          */
	u8  ad_bytes;           /* size of src/dst address              */
	u64 next_rip;           /* rip following the instruction        */
};

/*
 * x86_emulate_ops:
 *
 * These operations represent the instruction emulator's interface to memory.
 * There are two categories of operation: those that act on ordinary memory
 * regions (*_std), and those that act on memory regions known to require
 * special treatment or emulation (*_emulated).
 *
 * The emulator assumes that an instruction accesses only one 'emulated memory'
 * location, that this location is the given linear faulting address (cr2), and
 * that this is one of the instruction's data operands. Instruction fetches and
 * stack operations are assumed never to access emulated memory. The emulator
 * automatically deduces which operand of a string-move operation is accessing
 * emulated memory, and assumes that the other operand accesses normal memory.
 *
 * NOTES:
 *  1. The emulator isn't very smart about emulated vs. standard memory.
 *     'Emulated memory' access addresses should be checked for sanity.
 *     'Normal memory' accesses may fault, and the caller must arrange to
 *     detect and handle reentrancy into the emulator via recursive faults.
 *     Accesses may be unaligned and may cross page boundaries.
 *  2. If the access fails (cannot emulate, or a standard access faults) then
 *     it is up to the memop to propagate the fault to the guest VM via
 *     some out-of-band mechanism, unknown to the emulator. The memop signals
 *     failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
 *     then immediately bail.
 *  3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
 *     cmpxchg8b_emulated need support 8-byte accesses.
 *  4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
 */
/* Access completed successfully: continue emulation as normal. */
#define X86EMUL_CONTINUE        0
/* Access is unhandleable: bail from emulation and return error to caller. */
#define X86EMUL_UNHANDLEABLE    1
/* Terminate emulation but return success to the caller. */
#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
#define X86EMUL_RETRY_INSTR     3 /* retry the instruction for some reason */
#define X86EMUL_CMPXCHG_FAILED  4 /* cmpxchg did not see expected value */
#define X86EMUL_IO_NEEDED       5 /* IO is needed to complete emulation */
#define X86EMUL_INTERCEPTED     6 /* Intercepted by nested VMCB/VMCS */

struct x86_emulate_ops {
	/*
	 * read_std: Read bytes of standard (non-emulated/special) memory.
	 *           Used for descriptor reading.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*read_std)(unsigned long addr, void *val,
			unsigned int bytes, struct kvm_vcpu *vcpu,
			struct x86_exception *fault);

	/*
	 * write_std: Write bytes of standard (non-emulated/special) memory.
	 *            Used for descriptor writing.
	 *  @addr:  [IN ] Linear address to which to write.
	 *  @val:   [OUT] Value write to memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to write to memory.
	 */
	int (*write_std)(unsigned long addr, void *val,
			 unsigned int bytes, struct kvm_vcpu *vcpu,
			 struct x86_exception *fault);
	/*
	 * fetch: Read bytes of standard (non-emulated/special) memory.
	 *        Used for instruction fetch.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*fetch)(unsigned long addr, void *val,
		     unsigned int bytes, struct kvm_vcpu *vcpu,
		     struct x86_exception *fault);

	/*
	 * read_emulated: Read bytes from emulated/special memory area.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*read_emulated)(unsigned long addr,
			     void *val,
			     unsigned int bytes,
			     struct x86_exception *fault,
			     struct kvm_vcpu *vcpu);

	/*
	 * write_emulated: Write bytes to emulated/special memory area.
	 *  @addr:  [IN ] Linear address to which to write.
	 *  @val:   [IN ] Value to write to memory (low-order bytes used as
	 *                required).
	 *  @bytes: [IN ] Number of bytes to write to memory.
	 */
	int (*write_emulated)(unsigned long addr,
			      const void *val,
			      unsigned int bytes,
			      struct x86_exception *fault,
			      struct kvm_vcpu *vcpu);

	/*
	 * cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
	 *                   emulated/special memory area.
	 *  @addr:  [IN ] Linear address to access.
	 *  @old:   [IN ] Value expected to be current at @addr.
	 *  @new:   [IN ] Value to write to @addr.
	 *  @bytes: [IN ] Number of bytes to access using CMPXCHG.
	 */
	int (*cmpxchg_emulated)(unsigned long addr,
				const void *old,
				const void *new,
				unsigned int bytes,
				struct x86_exception *fault,
				struct kvm_vcpu *vcpu);

	int (*pio_in_emulated)(int size, unsigned short port, void *val,
			       unsigned int count, struct kvm_vcpu *vcpu);

	int (*pio_out_emulated)(int size, unsigned short port, const void *val,
				unsigned int count, struct kvm_vcpu *vcpu);

	bool (*get_cached_descriptor)(struct desc_struct *desc, u32 *base3,
				      int seg, struct kvm_vcpu *vcpu);
	void (*set_cached_descriptor)(struct desc_struct *desc, u32 base3,
				      int seg, struct kvm_vcpu *vcpu);
	u16 (*get_segment_selector)(int seg, struct kvm_vcpu *vcpu);
	void (*set_segment_selector)(u16 sel, int seg, struct kvm_vcpu *vcpu);
	unsigned long (*get_cached_segment_base)(int seg, struct kvm_vcpu *vcpu);
	void (*get_gdt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
	void (*get_idt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
	ulong (*get_cr)(int cr, struct kvm_vcpu *vcpu);
	int (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
	int (*cpl)(struct kvm_vcpu *vcpu);
	int (*get_dr)(int dr, unsigned long *dest, struct kvm_vcpu *vcpu);
	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
	void (*get_fpu)(struct x86_emulate_ctxt *ctxt); /* disables preempt */
	void (*put_fpu)(struct x86_emulate_ctxt *ctxt); /* reenables preempt */
	int (*intercept)(struct kvm_vcpu *vcpu,
			 struct x86_instruction_info *info,
			 enum x86_intercept_stage stage);
};

typedef u32 __attribute__((vector_size(16))) sse128_t;

/* Type, address-of, and value of an instruction's operand. */
struct operand {
	enum { OP_REG, OP_MEM, OP_IMM, OP_XMM, OP_NONE } type;
	unsigned int bytes;
	union {
		unsigned long orig_val;
		u64 orig_val64;
	};
	union {
		unsigned long *reg;
		struct segmented_address {
			ulong ea;
			unsigned seg;
		} mem;
		unsigned xmm;
	} addr;
	union {
		unsigned long val;
		u64 val64;
		char valptr[sizeof(unsigned long) + 2];
		sse128_t vec_val;
	};
};

struct fetch_cache {
	u8 data[15];
	unsigned long start;
	unsigned long end;
};

struct read_cache {
	u8 data[1024];
	unsigned long pos;
	unsigned long end;
};

struct decode_cache {
	u8 twobyte;
	u8 b;
	u8 intercept;
	u8 lock_prefix;
	u8 rep_prefix;
	u8 op_bytes;
	u8 ad_bytes;
	u8 rex_prefix;
	struct operand src;
	struct operand src2;
	struct operand dst;
	bool has_seg_override;
	u8 seg_override;
	unsigned int d;
	int (*execute)(struct x86_emulate_ctxt *ctxt);
	int (*check_perm)(struct x86_emulate_ctxt *ctxt);
	unsigned long regs[NR_VCPU_REGS];
	unsigned long eip;
	/* modrm */
	u8 modrm;
	u8 modrm_mod;
	u8 modrm_reg;
	u8 modrm_rm;
	u8 modrm_seg;
	bool rip_relative;
	struct fetch_cache fetch;
	struct read_cache io_read;
	struct read_cache mem_read;
};

struct x86_emulate_ctxt {
	struct x86_emulate_ops *ops;

	/* Register state before/after emulation. */
	struct kvm_vcpu *vcpu;

	unsigned long eflags;
	unsigned long eip; /* eip before instruction emulation */
	/* Emulated execution mode, represented by an X86EMUL_MODE value. */
	int mode;
	u32 cs_base;

	/* interruptibility state, as a result of execution of STI or MOV SS */
	int interruptibility;

	bool guest_mode; /* guest running a nested guest */
	bool perm_ok; /* do not check permissions if true */
	bool only_vendor_specific_insn;

	bool have_exception;
	struct x86_exception exception;

	/* decode cache */
	struct decode_cache decode;
};

/* Repeat String Operation Prefix */
#define REPE_PREFIX	0xf3
#define REPNE_PREFIX	0xf2

/* Execution mode, passed to the emulator. */
#define X86EMUL_MODE_REAL     0	/* Real mode.             */
#define X86EMUL_MODE_VM86     1	/* Virtual 8086 mode.     */
#define X86EMUL_MODE_PROT16   2	/* 16-bit protected mode. */
#define X86EMUL_MODE_PROT32   4	/* 32-bit protected mode. */
#define X86EMUL_MODE_PROT64   8	/* 64-bit (long) mode.    */

/* any protected mode   */
#define X86EMUL_MODE_PROT     (X86EMUL_MODE_PROT16|X86EMUL_MODE_PROT32| \
			       X86EMUL_MODE_PROT64)

enum x86_intercept_stage {
	X86_ICPT_PRE_EXCEPT,
	X86_ICPT_POST_EXCEPT,
	X86_ICPT_POST_MEMACCESS,
};

enum x86_intercept {
	x86_intercept_none,
	x86_intercept_cr_read,
	x86_intercept_cr_write,
	x86_intercept_clts,
	x86_intercept_lmsw,
	x86_intercept_smsw,
	x86_intercept_dr_read,
	x86_intercept_dr_write,
	x86_intercept_lidt,
	x86_intercept_sidt,
	x86_intercept_lgdt,
	x86_intercept_sgdt,
	x86_intercept_lldt,
	x86_intercept_sldt,
	x86_intercept_ltr,
	x86_intercept_str,
	x86_intercept_rdtsc,
	x86_intercept_rdpmc,
	x86_intercept_pushf,
	x86_intercept_popf,
	x86_intercept_cpuid,
	x86_intercept_rsm,
	x86_intercept_iret,
	x86_intercept_intn,
	x86_intercept_invd,
	x86_intercept_pause,
	x86_intercept_hlt,
	x86_intercept_invlpg,
	x86_intercept_invlpga,
	x86_intercept_vmrun,
	x86_intercept_vmload,
	x86_intercept_vmsave,
	x86_intercept_vmmcall,
	x86_intercept_stgi,
	x86_intercept_clgi,
	x86_intercept_skinit,
	x86_intercept_rdtscp,
	x86_intercept_icebp,
	x86_intercept_wbinvd,
	x86_intercept_monitor,
	x86_intercept_mwait,

	nr_x86_intercepts
};

/* Host execution mode. */
#if defined(CONFIG_X86_32)
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
#elif defined(CONFIG_X86_64)
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
#endif

int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len);
#define EMULATION_FAILED -1
#define EMULATION_OK 0
#define EMULATION_RESTART 1
#define EMULATION_INTERCEPTED 2
int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
			 u16 tss_selector, int reason,
			 bool has_error_code, u32 error_code);
int emulate_int_real(struct x86_emulate_ctxt *ctxt,
		     struct x86_emulate_ops *ops, int irq);
#endif /* _ASM_X86_KVM_X86_EMULATE_H */
Commit	Line	Data
6aa8b732 AK	1	/******************************************************************************
	2	* x86_emulate.h
	3	*
	4	* Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
	5	*
	6	* Copyright (c) 2005 Keir Fraser
	7	*
	8	* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
	9	*/
	10
1965aae3 PA	11	#ifndef _ASM_X86_KVM_X86_EMULATE_H
1965aae3 PA	12	#define _ASM_X86_KVM_X86_EMULATE_H
6aa8b732	13
38ba30ba GN	14	#include <asm/desc_defs.h>
38ba30ba GN	15
6aa8b732	16	struct x86_emulate_ctxt;
c4f035c6 AK	17	enum x86_intercept;
c4f035c6 AK	18	enum x86_intercept_stage;
6aa8b732	19
da9cb575 AK	20	struct x86_exception {
	21	u8 vector;
	22	bool error_code_valid;
	23	u16 error_code;
6389ee94 AK	24	bool nested_page_fault;
6389ee94 AK	25	u64 address; /* cr2 or nested page fault gpa */
da9cb575 AK	26	};
da9cb575 AK	27
8a76d7f2 JR	28	/*
	29	* This struct is used to carry enough information from the instruction
	30	* decoder to main KVM so that a decision can be made whether the
	31	* instruction needs to be intercepted or not.
	32	*/
	33	struct x86_instruction_info {
	34	u8 intercept; /* which intercept */
	35	u8 rep_prefix; /* rep prefix? */
	36	u8 modrm_mod; /* mod part of modrm */
	37	u8 modrm_reg; /* index of register used */
	38	u8 modrm_rm; /* rm part of modrm */
	39	u64 src_val; /* value of source operand */
	40	u8 src_bytes; /* size of source operand */
	41	u8 dst_bytes; /* size of destination operand */
	42	u8 ad_bytes; /* size of src/dst address */
	43	u64 next_rip; /* rip following the instruction */
	44	};
	45
6aa8b732 AK	46	/*
	47	* x86_emulate_ops:
	48	*
	49	* These operations represent the instruction emulator's interface to memory.
	50	* There are two categories of operation: those that act on ordinary memory
	51	* regions (*_std), and those that act on memory regions known to require
	52	* special treatment or emulation (*_emulated).
	53	*
	54	* The emulator assumes that an instruction accesses only one 'emulated memory'
	55	* location, that this location is the given linear faulting address (cr2), and
	56	* that this is one of the instruction's data operands. Instruction fetches and
	57	* stack operations are assumed never to access emulated memory. The emulator
	58	* automatically deduces which operand of a string-move operation is accessing
	59	* emulated memory, and assumes that the other operand accesses normal memory.
	60	*
	61	* NOTES:
	62	* 1. The emulator isn't very smart about emulated vs. standard memory.
	63	* 'Emulated memory' access addresses should be checked for sanity.
	64	* 'Normal memory' accesses may fault, and the caller must arrange to
	65	* detect and handle reentrancy into the emulator via recursive faults.
	66	* Accesses may be unaligned and may cross page boundaries.
	67	* 2. If the access fails (cannot emulate, or a standard access faults) then
	68	* it is up to the memop to propagate the fault to the guest VM via
	69	* some out-of-band mechanism, unknown to the emulator. The memop signals
	70	* failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
	71	* then immediately bail.
	72	* 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
	73	* cmpxchg8b_emulated need support 8-byte accesses.
	74	* 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
	75	*/
	76	/* Access completed successfully: continue emulation as normal. */
	77	#define X86EMUL_CONTINUE 0
	78	/* Access is unhandleable: bail from emulation and return error to caller. */
	79	#define X86EMUL_UNHANDLEABLE 1
	80	/* Terminate emulation but return success to the caller. */
	81	#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
e680080e GN	82	#define X86EMUL_RETRY_INSTR 3 /* retry the instruction for some reason */
e680080e GN	83	#define X86EMUL_CMPXCHG_FAILED 4 /* cmpxchg did not see expected value */
c3cd7ffa	84	#define X86EMUL_IO_NEEDED 5 /* IO is needed to complete emulation */
c4f035c6	85	#define X86EMUL_INTERCEPTED 6 /* Intercepted by nested VMCB/VMCS */
e680080e	86
6aa8b732 AK	87	struct x86_emulate_ops {
	88	/*
	89	* read_std: Read bytes of standard (non-emulated/special) memory.
1871c602	90	* Used for descriptor reading.
6aa8b732 AK	91	* @addr: [IN ] Linear address from which to read.
	92	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	93	* @bytes: [IN ] Number of bytes to read from memory.
	94	*/
4c690a1e	95	int (read_std)(unsigned long addr, void val,
bcc55cba AK	96	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	97	struct x86_exception *fault);
1871c602	98
2dafc6c2 GN	99	/*
	100	* write_std: Write bytes of standard (non-emulated/special) memory.
	101	* Used for descriptor writing.
	102	* @addr: [IN ] Linear address to which to write.
	103	* @val: [OUT] Value write to memory, zero-extended to 'u_long'.
	104	* @bytes: [IN ] Number of bytes to write to memory.
	105	*/
	106	int (write_std)(unsigned long addr, void val,
bcc55cba AK	107	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	108	struct x86_exception *fault);
1871c602 GN	109	/*
	110	* fetch: Read bytes of standard (non-emulated/special) memory.
	111	* Used for instruction fetch.
	112	* @addr: [IN ] Linear address from which to read.
	113	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	114	* @bytes: [IN ] Number of bytes to read from memory.
	115	*/
	116	int (fetch)(unsigned long addr, void val,
bcc55cba AK	117	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	118	struct x86_exception *fault);
6aa8b732 AK	119
	120	/*
	121	* read_emulated: Read bytes from emulated/special memory area.
	122	* @addr: [IN ] Linear address from which to read.
	123	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	124	* @bytes: [IN ] Number of bytes to read from memory.
	125	*/
0c7825e6 JP	126	int (*read_emulated)(unsigned long addr,
	127	void *val,
	128	unsigned int bytes,
bcc55cba	129	struct x86_exception *fault,
0c7825e6	130	struct kvm_vcpu *vcpu);
6aa8b732 AK	131
6aa8b732 AK	132	/*
0d178975	133	* write_emulated: Write bytes to emulated/special memory area.
6aa8b732 AK	134	* @addr: [IN ] Linear address to which to write.
	135	* @val: [IN ] Value to write to memory (low-order bytes used as
	136	* required).
	137	* @bytes: [IN ] Number of bytes to write to memory.
	138	*/
0c7825e6 JP	139	int (*write_emulated)(unsigned long addr,
	140	const void *val,
	141	unsigned int bytes,
bcc55cba	142	struct x86_exception *fault,
0c7825e6	143	struct kvm_vcpu *vcpu);
6aa8b732 AK	144
	145	/*
	146	* cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
	147	* emulated/special memory area.
	148	* @addr: [IN ] Linear address to access.
	149	* @old: [IN ] Value expected to be current at @addr.
	150	* @new: [IN ] Value to write to @addr.
	151	* @bytes: [IN ] Number of bytes to access using CMPXCHG.
	152	*/
0c7825e6 JP	153	int (*cmpxchg_emulated)(unsigned long addr,
	154	const void *old,
	155	const void *new,
	156	unsigned int bytes,
bcc55cba	157	struct x86_exception *fault,
0c7825e6	158	struct kvm_vcpu *vcpu);
cf8f70bf GN	159
	160	int (pio_in_emulated)(int size, unsigned short port, void val,
	161	unsigned int count, struct kvm_vcpu *vcpu);
	162
	163	int (pio_out_emulated)(int size, unsigned short port, const void val,
	164	unsigned int count, struct kvm_vcpu *vcpu);
	165
5601d05b	166	bool (get_cached_descriptor)(struct desc_struct desc, u32 *base3,
2dafc6c2	167	int seg, struct kvm_vcpu *vcpu);
5601d05b	168	void (set_cached_descriptor)(struct desc_struct desc, u32 base3,
2dafc6c2 GN	169	int seg, struct kvm_vcpu *vcpu);
	170	u16 (get_segment_selector)(int seg, struct kvm_vcpu vcpu);
	171	void (set_segment_selector)(u16 sel, int seg, struct kvm_vcpu vcpu);
5951c442	172	unsigned long (get_cached_segment_base)(int seg, struct kvm_vcpu vcpu);
2dafc6c2	173	void (get_gdt)(struct desc_ptr dt, struct kvm_vcpu *vcpu);
160ce1f1	174	void (get_idt)(struct desc_ptr dt, struct kvm_vcpu *vcpu);
52a46617	175	ulong (get_cr)(int cr, struct kvm_vcpu vcpu);
0f12244f	176	int (set_cr)(int cr, ulong val, struct kvm_vcpu vcpu);
9c537244	177	int (cpl)(struct kvm_vcpu vcpu);
35aa5375 GN	178	int (get_dr)(int dr, unsigned long dest, struct kvm_vcpu *vcpu);
35aa5375 GN	179	int (set_dr)(int dr, unsigned long value, struct kvm_vcpu vcpu);
3fb1b5db GN	180	int (set_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 data);
3fb1b5db GN	181	int (get_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 *pdata);
5037f6f3 AK	182	void (get_fpu)(struct x86_emulate_ctxt ctxt); /* disables preempt */
5037f6f3 AK	183	void (put_fpu)(struct x86_emulate_ctxt ctxt); /* reenables preempt */
8a76d7f2 JR	184	int (intercept)(struct kvm_vcpu vcpu,
8a76d7f2 JR	185	struct x86_instruction_info *info,
c4f035c6	186	enum x86_intercept_stage stage);
6aa8b732 AK	187	};
6aa8b732 AK	188
1253791d AK	189	typedef u32 __attribute__((vector_size(16))) sse128_t;
1253791d AK	190
e4e03ded LV	191	/* Type, address-of, and value of an instruction's operand. */
e4e03ded LV	192	struct operand {
1253791d	193	enum { OP_REG, OP_MEM, OP_IMM, OP_XMM, OP_NONE } type;
e4e03ded	194	unsigned int bytes;
16518d5a AK	195	union {
	196	unsigned long orig_val;
	197	u64 orig_val64;
	198	};
1a6440ae AK	199	union {
1a6440ae AK	200	unsigned long *reg;
90de84f5 AK	201	struct segmented_address {
	202	ulong ea;
	203	unsigned seg;
	204	} mem;
1253791d	205	unsigned xmm;
1a6440ae	206	} addr;
414e6277 GN	207	union {
414e6277 GN	208	unsigned long val;
16518d5a	209	u64 val64;
414e6277	210	char valptr[sizeof(unsigned long) + 2];
1253791d	211	sse128_t vec_val;
414e6277	212	};
e4e03ded LV	213	};
e4e03ded LV	214
62266869 AK	215	struct fetch_cache {
	216	u8 data[15];
	217	unsigned long start;
	218	unsigned long end;
	219	};
	220
7b262e90 GN	221	struct read_cache {
	222	u8 data[1024];
	223	unsigned long pos;
	224	unsigned long end;
	225	};
	226
e4e03ded LV	227	struct decode_cache {
	228	u8 twobyte;
	229	u8 b;
c4f035c6	230	u8 intercept;
e4e03ded LV	231	u8 lock_prefix;
	232	u8 rep_prefix;
	233	u8 op_bytes;
	234	u8 ad_bytes;
33615aa9	235	u8 rex_prefix;
e4e03ded	236	struct operand src;
0dc8d10f	237	struct operand src2;
e4e03ded	238	struct operand dst;
7a5b56df AK	239	bool has_seg_override;
7a5b56df AK	240	u8 seg_override;
e4e03ded	241	unsigned int d;
ef65c889	242	int (execute)(struct x86_emulate_ctxt ctxt);
d09beabd	243	int (check_perm)(struct x86_emulate_ctxt ctxt);
e4e03ded	244	unsigned long regs[NR_VCPU_REGS];
063db061	245	unsigned long eip;
e4e03ded LV	246	/* modrm */
	247	u8 modrm;
	248	u8 modrm_mod;
	249	u8 modrm_reg;
	250	u8 modrm_rm;
09ee57cd	251	u8 modrm_seg;
f5b4edcd	252	bool rip_relative;
62266869	253	struct fetch_cache fetch;
7b262e90	254	struct read_cache io_read;
9de41573	255	struct read_cache mem_read;
e4e03ded LV	256	};
e4e03ded LV	257
6aa8b732	258	struct x86_emulate_ctxt {
9aabc88f AK	259	struct x86_emulate_ops *ops;
9aabc88f AK	260
6aa8b732 AK	261	/* Register state before/after emulation. */
	262	struct kvm_vcpu *vcpu;
	263
6aa8b732	264	unsigned long eflags;
063db061	265	unsigned long eip; /* eip before instruction emulation */
6aa8b732 AK	266	/* Emulated execution mode, represented by an X86EMUL_MODE value. */
6aa8b732 AK	267	int mode;
7a5b56df	268	u32 cs_base;
e4e03ded	269
310b5d30 GC	270	/* interruptibility state, as a result of execution of STI or MOV SS */
	271	int interruptibility;
	272
c4f035c6	273	bool guest_mode; /* guest running a nested guest */
4fc40f07	274	bool perm_ok; /* do not check permissions if true */
d867162c	275	bool only_vendor_specific_insn;
54b8486f	276
da9cb575 AK	277	bool have_exception;
da9cb575 AK	278	struct x86_exception exception;
54b8486f	279
e4e03ded	280	/* decode cache */
e4e03ded	281	struct decode_cache decode;
6aa8b732 AK	282	};
6aa8b732 AK	283
90e0a28f	284	/* Repeat String Operation Prefix */
1d6b114f AK	285	#define REPE_PREFIX 0xf3
1d6b114f AK	286	#define REPNE_PREFIX 0xf2
90e0a28f	287
6aa8b732 AK	288	/* Execution mode, passed to the emulator. */
6aa8b732 AK	289	#define X86EMUL_MODE_REAL 0 /* Real mode. */
a0044755	290	#define X86EMUL_MODE_VM86 1 /* Virtual 8086 mode. */
6aa8b732 AK	291	#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */
	292	#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */
	293	#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */
	294
8ea7d6ae JR	295	/* any protected mode */
	296	#define X86EMUL_MODE_PROT (X86EMUL_MODE_PROT16\|X86EMUL_MODE_PROT32\| \
	297	X86EMUL_MODE_PROT64)
	298
c4f035c6 AK	299	enum x86_intercept_stage {
	300	X86_ICPT_PRE_EXCEPT,
	301	X86_ICPT_POST_EXCEPT,
	302	X86_ICPT_POST_MEMACCESS,
	303	};
	304
	305	enum x86_intercept {
	306	x86_intercept_none,
cfec82cb JR	307	x86_intercept_cr_read,
	308	x86_intercept_cr_write,
	309	x86_intercept_clts,
3c6e276f AK	310	x86_intercept_lmsw,
3c6e276f AK	311	x86_intercept_smsw,
3b88e41a JR	312	x86_intercept_dr_read,
3b88e41a JR	313	x86_intercept_dr_write,
3c6e276f AK	314	x86_intercept_lidt,
	315	x86_intercept_sidt,
	316	x86_intercept_lgdt,
	317	x86_intercept_sgdt,
	318	x86_intercept_lldt,
	319	x86_intercept_sldt,
	320	x86_intercept_ltr,
	321	x86_intercept_str,
	322	x86_intercept_rdtsc,
	323	x86_intercept_rdpmc,
	324	x86_intercept_pushf,
	325	x86_intercept_popf,
	326	x86_intercept_cpuid,
	327	x86_intercept_rsm,
	328	x86_intercept_iret,
	329	x86_intercept_intn,
	330	x86_intercept_invd,
	331	x86_intercept_pause,
	332	x86_intercept_hlt,
	333	x86_intercept_invlpg,
	334	x86_intercept_invlpga,
	335	x86_intercept_vmrun,
	336	x86_intercept_vmload,
	337	x86_intercept_vmsave,
	338	x86_intercept_vmmcall,
	339	x86_intercept_stgi,
	340	x86_intercept_clgi,
	341	x86_intercept_skinit,
	342	x86_intercept_rdtscp,
	343	x86_intercept_icebp,
	344	x86_intercept_wbinvd,
	345	x86_intercept_monitor,
	346	x86_intercept_mwait,
c4f035c6 AK	347
	348	nr_x86_intercepts
	349	};
	350
6aa8b732	351	/* Host execution mode. */
d73fa29a	352	#if defined(CONFIG_X86_32)
6aa8b732	353	#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
05b3e0c2	354	#elif defined(CONFIG_X86_64)
6aa8b732 AK	355	#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
	356	#endif
	357
dc25e89e	358	int x86_decode_insn(struct x86_emulate_ctxt ctxt, void insn, int insn_len);
d2ddd1c4 GN	359	#define EMULATION_FAILED -1
	360	#define EMULATION_OK 0
	361	#define EMULATION_RESTART 1
775fde86	362	#define EMULATION_INTERCEPTED 2
9aabc88f	363	int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
38ba30ba	364	int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
e269fb21 JK	365	u16 tss_selector, int reason,
e269fb21 JK	366	bool has_error_code, u32 error_code);
4ab8e024 MG	367	int emulate_int_real(struct x86_emulate_ctxt *ctxt,
4ab8e024 MG	368	struct x86_emulate_ops *ops, int irq);
1965aae3	369	#endif /* _ASM_X86_KVM_X86_EMULATE_H */