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KVM: SVM: Load %gs earlier if CONFIG_X86_32_LAZY_GS=n
[deliverable/linux.git] / arch / x86 / include / asm / kvm_emulate.h
CommitLineData
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
12#define _ASM_X86_KVM_X86_EMULATE_H
6aa8b732 13
38ba30ba
GN		 14#include <asm/desc_defs.h>
15
6aa8b732
AK		 16struct x86_emulate_ctxt;
17
da9cb575
AK		 18struct x86_exception {
19 u8 vector;
20 bool error_code_valid;
21 u16 error_code;
6389ee94
AK		 22 bool nested_page_fault;
23 u64 address; /* cr2 or nested page fault gpa */
da9cb575
AK		 24};
25
6aa8b732
AK		 26/*
27 * x86_emulate_ops:
28 *
29 * These operations represent the instruction emulator's interface to memory.
30 * There are two categories of operation: those that act on ordinary memory
31 * regions (*_std), and those that act on memory regions known to require
32 * special treatment or emulation (*_emulated).
33 *
34 * The emulator assumes that an instruction accesses only one 'emulated memory'
35 * location, that this location is the given linear faulting address (cr2), and
36 * that this is one of the instruction's data operands. Instruction fetches and
37 * stack operations are assumed never to access emulated memory. The emulator
38 * automatically deduces which operand of a string-move operation is accessing
39 * emulated memory, and assumes that the other operand accesses normal memory.
40 *
41 * NOTES:
42 * 1. The emulator isn't very smart about emulated vs. standard memory.
43 * 'Emulated memory' access addresses should be checked for sanity.
44 * 'Normal memory' accesses may fault, and the caller must arrange to
45 * detect and handle reentrancy into the emulator via recursive faults.
46 * Accesses may be unaligned and may cross page boundaries.
47 * 2. If the access fails (cannot emulate, or a standard access faults) then
48 * it is up to the memop to propagate the fault to the guest VM via
49 * some out-of-band mechanism, unknown to the emulator. The memop signals
50 * failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
51 * then immediately bail.
52 * 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
53 * cmpxchg8b_emulated need support 8-byte accesses.
54 * 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
55 */
56/* Access completed successfully: continue emulation as normal. */
57#define X86EMUL_CONTINUE 0
58/* Access is unhandleable: bail from emulation and return error to caller. */
59#define X86EMUL_UNHANDLEABLE 1
60/* Terminate emulation but return success to the caller. */
61#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
e680080e
GN		 62#define X86EMUL_RETRY_INSTR 3 /* retry the instruction for some reason */
63#define X86EMUL_CMPXCHG_FAILED 4 /* cmpxchg did not see expected value */
c3cd7ffa 64#define X86EMUL_IO_NEEDED 5 /* IO is needed to complete emulation */
e680080e 65
6aa8b732
AK		 66struct x86_emulate_ops {
67 /*
68 * read_std: Read bytes of standard (non-emulated/special) memory.
1871c602 69 * Used for descriptor reading.
6aa8b732
AK		 70 * @addr: [IN ] Linear address from which to read.
71 * @val: [OUT] Value read from memory, zero-extended to 'u_long'.
72 * @bytes: [IN ] Number of bytes to read from memory.
73 */
4c690a1e 74 int (*read_std)(unsigned long addr, void *val,
bcc55cba
AK		 75 unsigned int bytes, struct kvm_vcpu *vcpu,
76 struct x86_exception *fault);
1871c602 77
2dafc6c2
GN		 78 /*
79 * write_std: Write bytes of standard (non-emulated/special) memory.
80 * Used for descriptor writing.
81 * @addr: [IN ] Linear address to which to write.
82 * @val: [OUT] Value write to memory, zero-extended to 'u_long'.
83 * @bytes: [IN ] Number of bytes to write to memory.
84 */
85 int (*write_std)(unsigned long addr, void *val,
bcc55cba
AK		 86 unsigned int bytes, struct kvm_vcpu *vcpu,
87 struct x86_exception *fault);
1871c602
GN		 88 /*
89 * fetch: Read bytes of standard (non-emulated/special) memory.
90 * Used for instruction fetch.
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 */
95 int (*fetch)(unsigned long addr, void *val,
bcc55cba
AK		 96 unsigned int bytes, struct kvm_vcpu *vcpu,
97 struct x86_exception *fault);
6aa8b732
AK		 98
99 /*
100 * read_emulated: Read bytes from emulated/special memory area.
101 * @addr: [IN ] Linear address from which to read.
102 * @val: [OUT] Value read from memory, zero-extended to 'u_long'.
103 * @bytes: [IN ] Number of bytes to read from memory.
104 */
0c7825e6
JP		 105 int (*read_emulated)(unsigned long addr,
106 void *val,
107 unsigned int bytes,
bcc55cba 108 struct x86_exception *fault,
0c7825e6 109 struct kvm_vcpu *vcpu);
6aa8b732
AK		 110
111 /*
0d178975 112 * write_emulated: Write bytes to emulated/special memory area.
6aa8b732
AK		 113 * @addr: [IN ] Linear address to which to write.
114 * @val: [IN ] Value to write to memory (low-order bytes used as
115 * required).
116 * @bytes: [IN ] Number of bytes to write to memory.
117 */
0c7825e6
JP		 118 int (*write_emulated)(unsigned long addr,
119 const void *val,
120 unsigned int bytes,
bcc55cba 121 struct x86_exception *fault,
0c7825e6 122 struct kvm_vcpu *vcpu);
6aa8b732
AK		 123
124 /*
125 * cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
126 * emulated/special memory area.
127 * @addr: [IN ] Linear address to access.
128 * @old: [IN ] Value expected to be current at @addr.
129 * @new: [IN ] Value to write to @addr.
130 * @bytes: [IN ] Number of bytes to access using CMPXCHG.
131 */
0c7825e6
JP		 132 int (*cmpxchg_emulated)(unsigned long addr,
133 const void *old,
134 const void *new,
135 unsigned int bytes,
bcc55cba 136 struct x86_exception *fault,
0c7825e6 137 struct kvm_vcpu *vcpu);
cf8f70bf
GN		 138
139 int (*pio_in_emulated)(int size, unsigned short port, void *val,
140 unsigned int count, struct kvm_vcpu *vcpu);
141
142 int (*pio_out_emulated)(int size, unsigned short port, const void *val,
143 unsigned int count, struct kvm_vcpu *vcpu);
144
2dafc6c2
GN		 145 bool (*get_cached_descriptor)(struct desc_struct *desc,
146 int seg, struct kvm_vcpu *vcpu);
147 void (*set_cached_descriptor)(struct desc_struct *desc,
148 int seg, struct kvm_vcpu *vcpu);
149 u16 (*get_segment_selector)(int seg, struct kvm_vcpu *vcpu);
150 void (*set_segment_selector)(u16 sel, int seg, struct kvm_vcpu *vcpu);
5951c442 151 unsigned long (*get_cached_segment_base)(int seg, struct kvm_vcpu *vcpu);
2dafc6c2 152 void (*get_gdt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
160ce1f1 153 void (*get_idt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
52a46617 154 ulong (*get_cr)(int cr, struct kvm_vcpu *vcpu);
0f12244f 155 int (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
9c537244 156 int (*cpl)(struct kvm_vcpu *vcpu);
35aa5375
GN		 157 int (*get_dr)(int dr, unsigned long *dest, struct kvm_vcpu *vcpu);
158 int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
3fb1b5db
GN		 159 int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
160 int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
6aa8b732
AK		 161};
162
e4e03ded
LV		 163/* Type, address-of, and value of an instruction's operand. */
164struct operand {
a01af5ec 165 enum { OP_REG, OP_MEM, OP_IMM, OP_NONE } type;
e4e03ded 166 unsigned int bytes;
16518d5a
AK		 167 union {
168 unsigned long orig_val;
169 u64 orig_val64;
170 };
1a6440ae
AK		 171 union {
172 unsigned long *reg;
90de84f5
AK		 173 struct segmented_address {
174 ulong ea;
175 unsigned seg;
176 } mem;
1a6440ae 177 } addr;
414e6277
GN		 178 union {
179 unsigned long val;
16518d5a 180 u64 val64;
414e6277
GN		 181 char valptr[sizeof(unsigned long) + 2];
182 };
e4e03ded
LV		 183};
184
62266869
AK		 185struct fetch_cache {
186 u8 data[15];
187 unsigned long start;
188 unsigned long end;
189};
190
7b262e90
GN		 191struct read_cache {
192 u8 data[1024];
193 unsigned long pos;
194 unsigned long end;
195};
196
e4e03ded
LV		 197struct decode_cache {
198 u8 twobyte;
199 u8 b;
200 u8 lock_prefix;
201 u8 rep_prefix;
202 u8 op_bytes;
203 u8 ad_bytes;
33615aa9 204 u8 rex_prefix;
e4e03ded 205 struct operand src;
0dc8d10f 206 struct operand src2;
e4e03ded 207 struct operand dst;
7a5b56df
AK		 208 bool has_seg_override;
209 u8 seg_override;
e4e03ded 210 unsigned int d;
ef65c889 211 int (*execute)(struct x86_emulate_ctxt *ctxt);
e4e03ded 212 unsigned long regs[NR_VCPU_REGS];
063db061 213 unsigned long eip;
e4e03ded
LV		 214 /* modrm */
215 u8 modrm;
216 u8 modrm_mod;
217 u8 modrm_reg;
218 u8 modrm_rm;
09ee57cd 219 u8 modrm_seg;
f5b4edcd 220 bool rip_relative;
62266869 221 struct fetch_cache fetch;
7b262e90 222 struct read_cache io_read;
9de41573 223 struct read_cache mem_read;
e4e03ded
LV		 224};
225
6aa8b732 226struct x86_emulate_ctxt {
9aabc88f
AK		 227 struct x86_emulate_ops *ops;
228
6aa8b732
AK		 229 /* Register state before/after emulation. */
230 struct kvm_vcpu *vcpu;
231
6aa8b732 232 unsigned long eflags;
063db061 233 unsigned long eip; /* eip before instruction emulation */
6aa8b732
AK		 234 /* Emulated execution mode, represented by an X86EMUL_MODE value. */
235 int mode;
7a5b56df 236 u32 cs_base;
e4e03ded 237
310b5d30
GC		 238 /* interruptibility state, as a result of execution of STI or MOV SS */
239 int interruptibility;
240
4fc40f07 241 bool perm_ok; /* do not check permissions if true */
d867162c 242 bool only_vendor_specific_insn;
54b8486f 243
da9cb575
AK		 244 bool have_exception;
245 struct x86_exception exception;
54b8486f 246
e4e03ded 247 /* decode cache */
e4e03ded 248 struct decode_cache decode;
6aa8b732
AK		 249};
250
90e0a28f 251/* Repeat String Operation Prefix */
d73fa29a
SY		 252#define REPE_PREFIX 1
253#define REPNE_PREFIX 2
90e0a28f 254
6aa8b732
AK		 255/* Execution mode, passed to the emulator. */
256#define X86EMUL_MODE_REAL 0 /* Real mode. */
a0044755 257#define X86EMUL_MODE_VM86 1 /* Virtual 8086 mode. */
6aa8b732
AK		 258#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */
259#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */
260#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */
261
262/* Host execution mode. */
d73fa29a 263#if defined(CONFIG_X86_32)
6aa8b732 264#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
05b3e0c2 265#elif defined(CONFIG_X86_64)
6aa8b732
AK		 266#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
267#endif
268
dc25e89e 269int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len);
d2ddd1c4
GN		 270#define EMULATION_FAILED -1
271#define EMULATION_OK 0
272#define EMULATION_RESTART 1
9aabc88f 273int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
38ba30ba 274int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
e269fb21
JK		 275 u16 tss_selector, int reason,
276 bool has_error_code, u32 error_code);
4ab8e024
MG		 277int emulate_int_real(struct x86_emulate_ctxt *ctxt,
278 struct x86_emulate_ops *ops, int irq);
1965aae3 279#endif /* _ASM_X86_KVM_X86_EMULATE_H */
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