diff options
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 749 |
1 files changed, 422 insertions, 327 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 5ac0bb465ed6..b38bd8b92aa6 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -9,6 +9,7 @@ * privileged instructions: * * Copyright (C) 2006 Qumranet + * Copyright 2010 Red Hat, Inc. and/or its affilates. * * Avi Kivity <avi@qumranet.com> * Yaniv Kamay <yaniv@qumranet.com> @@ -67,6 +68,9 @@ #define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */ #define SrcImmU (9<<4) /* Immediate operand, unsigned */ #define SrcSI (0xa<<4) /* Source is in the DS:RSI */ +#define SrcImmFAddr (0xb<<4) /* Source is immediate far address */ +#define SrcMemFAddr (0xc<<4) /* Source is far address in memory */ +#define SrcAcc (0xd<<4) /* Source Accumulator */ #define SrcMask (0xf<<4) /* Generic ModRM decode. */ #define ModRM (1<<8) @@ -88,10 +92,6 @@ #define Src2CL (1<<29) #define Src2ImmByte (2<<29) #define Src2One (3<<29) -#define Src2Imm16 (4<<29) -#define Src2Mem16 (5<<29) /* Used for Ep encoding. First argument has to be - in memory and second argument is located - immediately after the first one in memory. */ #define Src2Mask (7<<29) enum { @@ -124,15 +124,15 @@ static u32 opcode_table[256] = { /* 0x20 - 0x27 */ ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, - DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, + ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, /* 0x28 - 0x2F */ ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, - 0, 0, 0, 0, + ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, /* 0x30 - 0x37 */ ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, - 0, 0, 0, 0, + ByteOp | DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0, /* 0x38 - 0x3F */ ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, @@ -170,20 +170,20 @@ static u32 opcode_table[256] = { /* 0x88 - 0x8F */ ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov, ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, - DstMem | SrcReg | ModRM | Mov, ModRM | DstReg, - DstReg | SrcMem | ModRM | Mov, Group | Group1A, + DstMem | SrcNone | ModRM | Mov, ModRM | DstReg, + ImplicitOps | SrcMem16 | ModRM, Group | Group1A, /* 0x90 - 0x97 */ DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, /* 0x98 - 0x9F */ - 0, 0, SrcImm | Src2Imm16 | No64, 0, + 0, 0, SrcImmFAddr | No64, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0, /* 0xA0 - 0xA7 */ - ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs, - ByteOp | DstMem | SrcReg | Mov | MemAbs, DstMem | SrcReg | Mov | MemAbs, + ByteOp | DstAcc | SrcMem | Mov | MemAbs, DstAcc | SrcMem | Mov | MemAbs, + ByteOp | DstMem | SrcAcc | Mov | MemAbs, DstMem | SrcAcc | Mov | MemAbs, ByteOp | SrcSI | DstDI | Mov | String, SrcSI | DstDI | Mov | String, ByteOp | SrcSI | DstDI | String, SrcSI | DstDI | String, /* 0xA8 - 0xAF */ - 0, 0, ByteOp | DstDI | Mov | String, DstDI | Mov | String, + DstAcc | SrcImmByte | ByteOp, DstAcc | SrcImm, ByteOp | DstDI | Mov | String, DstDI | Mov | String, ByteOp | SrcSI | DstAcc | Mov | String, SrcSI | DstAcc | Mov | String, ByteOp | DstDI | String, DstDI | String, /* 0xB0 - 0xB7 */ @@ -215,7 +215,7 @@ static u32 opcode_table[256] = { ByteOp | SrcImmUByte | DstAcc, SrcImmUByte | DstAcc, /* 0xE8 - 0xEF */ SrcImm | Stack, SrcImm | ImplicitOps, - SrcImmU | Src2Imm16 | No64, SrcImmByte | ImplicitOps, + SrcImmFAddr | No64, SrcImmByte | ImplicitOps, SrcNone | ByteOp | DstAcc, SrcNone | DstAcc, SrcNone | ByteOp | DstAcc, SrcNone | DstAcc, /* 0xF0 - 0xF7 */ @@ -337,20 +337,20 @@ static u32 group_table[] = { [Group1A*8] = DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0, [Group3_Byte*8] = - ByteOp | SrcImm | DstMem | ModRM, 0, + ByteOp | SrcImm | DstMem | ModRM, ByteOp | SrcImm | DstMem | ModRM, ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, 0, 0, 0, 0, [Group3*8] = - DstMem | SrcImm | ModRM, 0, + DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, 0, 0, 0, 0, [Group4*8] = - ByteOp | DstMem | SrcNone | ModRM, ByteOp | DstMem | SrcNone | ModRM, + ByteOp | DstMem | SrcNone | ModRM | Lock, ByteOp | DstMem | SrcNone | ModRM | Lock, 0, 0, 0, 0, 0, 0, [Group5*8] = - DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, + DstMem | SrcNone | ModRM | Lock, DstMem | SrcNone | ModRM | Lock, SrcMem | ModRM | Stack, 0, - SrcMem | ModRM | Stack, SrcMem | ModRM | Src2Mem16 | ImplicitOps, + SrcMem | ModRM | Stack, SrcMemFAddr | ModRM | ImplicitOps, SrcMem | ModRM | Stack, 0, [Group7*8] = 0, 0, ModRM | SrcMem | Priv, ModRM | SrcMem | Priv, @@ -576,6 +576,13 @@ static u32 group2_table[] = { (_type)_x; \ }) +#define insn_fetch_arr(_arr, _size, _eip) \ +({ rc = do_insn_fetch(ctxt, ops, (_eip), _arr, (_size)); \ + if (rc != X86EMUL_CONTINUE) \ + goto done; \ + (_eip) += (_size); \ +}) + static inline unsigned long ad_mask(struct decode_cache *c) { return (1UL << (c->ad_bytes << 3)) - 1; @@ -617,31 +624,66 @@ static void set_seg_override(struct decode_cache *c, int seg) c->seg_override = seg; } -static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg) +static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops, int seg) { if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS) return 0; - return kvm_x86_ops->get_segment_base(ctxt->vcpu, seg); + return ops->get_cached_segment_base(seg, ctxt->vcpu); } static unsigned long seg_override_base(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops, struct decode_cache *c) { if (!c->has_seg_override) return 0; - return seg_base(ctxt, c->seg_override); + return seg_base(ctxt, ops, c->seg_override); +} + +static unsigned long es_base(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops) +{ + return seg_base(ctxt, ops, VCPU_SREG_ES); +} + +static unsigned long ss_base(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops) +{ + return seg_base(ctxt, ops, VCPU_SREG_SS); +} + +static void emulate_exception(struct x86_emulate_ctxt *ctxt, int vec, + u32 error, bool valid) +{ + ctxt->exception = vec; + ctxt->error_code = error; + ctxt->error_code_valid = valid; + ctxt->restart = false; +} + +static void emulate_gp(struct x86_emulate_ctxt *ctxt, int err) +{ + emulate_exception(ctxt, GP_VECTOR, err, true); } -static unsigned long es_base(struct x86_emulate_ctxt *ctxt) +static void emulate_pf(struct x86_emulate_ctxt *ctxt, unsigned long addr, + int err) { - return seg_base(ctxt, VCPU_SREG_ES); + ctxt->cr2 = addr; + emulate_exception(ctxt, PF_VECTOR, err, true); } -static unsigned long ss_base(struct x86_emulate_ctxt *ctxt) +static void emulate_ud(struct x86_emulate_ctxt *ctxt) { - return seg_base(ctxt, VCPU_SREG_SS); + emulate_exception(ctxt, UD_VECTOR, 0, false); +} + +static void emulate_ts(struct x86_emulate_ctxt *ctxt, int err) +{ + emulate_exception(ctxt, TS_VECTOR, err, true); } static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt, @@ -932,12 +974,9 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) /* we cannot decode insn before we complete previous rep insn */ WARN_ON(ctxt->restart); - /* Shadow copy of register state. Committed on successful emulation. */ - memset(c, 0, sizeof(struct decode_cache)); c->eip = ctxt->eip; c->fetch.start = c->fetch.end = c->eip; - ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS); - memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); + ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS); switch (mode) { case X86EMUL_MODE_REAL: @@ -1060,7 +1099,7 @@ done_prefixes: set_seg_override(c, VCPU_SREG_DS); if (!(!c->twobyte && c->b == 0x8d)) - c->modrm_ea += seg_override_base(ctxt, c); + c->modrm_ea += seg_override_base(ctxt, ops, c); if (c->ad_bytes != 8) c->modrm_ea = (u32)c->modrm_ea; @@ -1148,6 +1187,25 @@ done_prefixes: else c->src.val = insn_fetch(u8, 1, c->eip); break; + case SrcAcc: + c->src.type = OP_REG; + c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; + c->src.ptr = &c->regs[VCPU_REGS_RAX]; + switch (c->src.bytes) { + case 1: + c->src.val = *(u8 *)c->src.ptr; + break; + case 2: + c->src.val = *(u16 *)c->src.ptr; + break; + case 4: + c->src.val = *(u32 *)c->src.ptr; + break; + case 8: + c->src.val = *(u64 *)c->src.ptr; + break; + } + break; case SrcOne: c->src.bytes = 1; c->src.val = 1; @@ -1156,10 +1214,21 @@ done_prefixes: c->src.type = OP_MEM; c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; c->src.ptr = (unsigned long *) - register_address(c, seg_override_base(ctxt, c), + register_address(c, seg_override_base(ctxt, ops, c), c->regs[VCPU_REGS_RSI]); c->src.val = 0; break; + case SrcImmFAddr: + c->src.type = OP_IMM; + c->src.ptr = (unsigned long *)c->eip; + c->src.bytes = c->op_bytes + 2; + insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip); + break; + case SrcMemFAddr: + c->src.type = OP_MEM; + c->src.ptr = (unsigned long *)c->modrm_ea; + c->src.bytes = c->op_bytes + 2; + break; } /* @@ -1179,22 +1248,10 @@ done_prefixes: c->src2.bytes = 1; c->src2.val = insn_fetch(u8, 1, c->eip); break; - case Src2Imm16: - c->src2.type = OP_IMM; - c->src2.ptr = (unsigned long *)c->eip; - c->src2.bytes = 2; - c->src2.val = insn_fetch(u16, 2, c->eip); - break; case Src2One: c->src2.bytes = 1; c->src2.val = 1; break; - case Src2Mem16: - c->src2.type = OP_MEM; - c->src2.bytes = 2; - c->src2.ptr = (unsigned long *)(c->modrm_ea + c->src.bytes); - c->src2.val = 0; - break; } /* Decode and fetch the destination operand: register or memory. */ @@ -1253,7 +1310,7 @@ done_prefixes: c->dst.type = OP_MEM; c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; c->dst.ptr = (unsigned long *) - register_address(c, es_base(ctxt), + register_address(c, es_base(ctxt, ops), c->regs[VCPU_REGS_RDI]); c->dst.val = 0; break; @@ -1263,6 +1320,37 @@ done: return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; } +static int read_emulated(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops, + unsigned long addr, void *dest, unsigned size) +{ + int rc; + struct read_cache *mc = &ctxt->decode.mem_read; + u32 err; + + while (size) { + int n = min(size, 8u); + size -= n; + if (mc->pos < mc->end) + goto read_cached; + + rc = ops->read_emulated(addr, mc->data + mc->end, n, &err, + ctxt->vcpu); + if (rc == X86EMUL_PROPAGATE_FAULT) + emulate_pf(ctxt, addr, err); + if (rc != X86EMUL_CONTINUE) + return rc; + mc->end += n; + + read_cached: + memcpy(dest, mc->data + mc->pos, n); + mc->pos += n; + dest += n; + addr += n; + } + return X86EMUL_CONTINUE; +} + static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops, unsigned int size, unsigned short port, @@ -1330,13 +1418,13 @@ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt, get_descriptor_table_ptr(ctxt, ops, selector, &dt); if (dt.size < index * 8 + 7) { - kvm_inject_gp(ctxt->vcpu, selector & 0xfffc); + emulate_gp(ctxt, selector & 0xfffc); return X86EMUL_PROPAGATE_FAULT; } addr = dt.address + index * 8; ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu, &err); if (ret == X86EMUL_PROPAGATE_FAULT) - kvm_inject_page_fault(ctxt->vcpu, addr, err); + emulate_pf(ctxt, addr, err); return ret; } @@ -1355,14 +1443,14 @@ static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt, get_descriptor_table_ptr(ctxt, ops, selector, &dt); if (dt.size < index * 8 + 7) { - kvm_inject_gp(ctxt->vcpu, selector & 0xfffc); + emulate_gp(ctxt, selector & 0xfffc); return X86EMUL_PROPAGATE_FAULT; } addr = dt.address + index * 8; ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu, &err); if (ret == X86EMUL_PROPAGATE_FAULT) - kvm_inject_page_fault(ctxt->vcpu, addr, err); + emulate_pf(ctxt, addr, err); return ret; } @@ -1481,11 +1569,70 @@ load: ops->set_cached_descriptor(&seg_desc, seg, ctxt->vcpu); return X86EMUL_CONTINUE; exception: - kvm_queue_exception_e(ctxt->vcpu, err_vec, err_code); + emulate_exception(ctxt, err_vec, err_code, true); return X86EMUL_PROPAGATE_FAULT; } -static inline void emulate_push(struct x86_emulate_ctxt *ctxt) +static inline int writeback(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops) +{ + int rc; + struct decode_cache *c = &ctxt->decode; + u32 err; + + switch (c->dst.type) { + case OP_REG: + /* The 4-byte case *is* correct: + * in 64-bit mode we zero-extend. + */ + switch (c->dst.bytes) { + case 1: + *(u8 *)c->dst.ptr = (u8)c->dst.val; + break; + case 2: + *(u16 *)c->dst.ptr = (u16)c->dst.val; + break; + case 4: + *c->dst.ptr = (u32)c->dst.val; + break; /* 64b: zero-ext */ + case 8: + *c->dst.ptr = c->dst.val; + break; + } + break; + case OP_MEM: + if (c->lock_prefix) + rc = ops->cmpxchg_emulated( + (unsigned long)c->dst.ptr, + &c->dst.orig_val, + &c->dst.val, + c->dst.bytes, + &err, + ctxt->vcpu); + else + rc = ops->write_emulated( + (unsigned long)c->dst.ptr, + &c->dst.val, + c->dst.bytes, + &err, + ctxt->vcpu); + if (rc == X86EMUL_PROPAGATE_FAULT) + emulate_pf(ctxt, + (unsigned long)c->dst.ptr, err); + if (rc != X86EMUL_CONTINUE) + return rc; + break; + case OP_NONE: + /* no writeback */ + break; + default: + break; + } + return X86EMUL_CONTINUE; +} + +static inline void emulate_push(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; @@ -1493,7 +1640,7 @@ static inline void emulate_push(struct x86_emulate_ctxt *ctxt) c->dst.bytes = c->op_bytes; c->dst.val = c->src.val; register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes); - c->dst.ptr = (void *) register_address(c, ss_base(ctxt), + c->dst.ptr = (void *) register_address(c, ss_base(ctxt, ops), c->regs[VCPU_REGS_RSP]); } @@ -1504,9 +1651,9 @@ static int emulate_pop(struct x86_emulate_ctxt *ctxt, struct decode_cache *c = &ctxt->decode; int rc; - rc = ops->read_emulated(register_address(c, ss_base(ctxt), - c->regs[VCPU_REGS_RSP]), - dest, len, ctxt->vcpu); + rc = read_emulated(ctxt, ops, register_address(c, ss_base(ctxt, ops), + c->regs[VCPU_REGS_RSP]), + dest, len); if (rc != X86EMUL_CONTINUE) return rc; @@ -1541,7 +1688,7 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt, break; case X86EMUL_MODE_VM86: if (iopl < 3) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } change_mask |= EFLG_IF; @@ -1557,15 +1704,14 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt, return rc; } -static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt, int seg) +static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops, int seg) { struct decode_cache *c = &ctxt->decode; - struct kvm_segment segment; - kvm_x86_ops->get_segment(ctxt->vcpu, &segment, seg); + c->src.val = ops->get_segment_selector(seg, ctxt->vcpu); - c->src.val = segment.selector; - emulate_push(ctxt); + emulate_push(ctxt, ops); } static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt, @@ -1583,19 +1729,31 @@ static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt, return rc; } -static void emulate_pusha(struct x86_emulate_ctxt *ctxt) +static int emulate_pusha(struct x86_emulate_ctxt *ctxt, + struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; unsigned long old_esp = c->regs[VCPU_REGS_RSP]; + int rc = X86EMUL_CONTINUE; int reg = VCPU_REGS_RAX; while (reg <= VCPU_REGS_RDI) { (reg == VCPU_REGS_RSP) ? (c->src.val = old_esp) : (c->src.val = c->regs[reg]); - emulate_push(ctxt); + emulate_push(ctxt, ops); + + rc = writeback(ctxt, ops); + if (rc != X86EMUL_CONTINUE) + return rc; + ++reg; } + + /* Disable writeback. */ + c->dst.type = OP_NONE; + + return rc; } static int emulate_popa(struct x86_emulate_ctxt *ctxt, @@ -1695,14 +1853,14 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt, old_eip = c->eip; c->eip = c->src.val; c->src.val = old_eip; - emulate_push(ctxt); + emulate_push(ctxt, ops); break; } case 4: /* jmp abs */ c->eip = c->src.val; break; case 6: /* push */ - emulate_push(ctxt); + emulate_push(ctxt, ops); break; } return X86EMUL_CONTINUE; @@ -1748,145 +1906,82 @@ static int emulate_ret_far(struct x86_emulate_ctxt *ctxt, return rc; } -static inline int writeback(struct x86_emulate_ctxt *ctxt, - struct x86_emulate_ops *ops) -{ - int rc; - struct decode_cache *c = &ctxt->decode; - - switch (c->dst.type) { - case OP_REG: - /* The 4-byte case *is* correct: - * in 64-bit mode we zero-extend. - */ - switch (c->dst.bytes) { - case 1: - *(u8 *)c->dst.ptr = (u8)c->dst.val; - break; - case 2: - *(u16 *)c->dst.ptr = (u16)c->dst.val; - break; - case 4: - *c->dst.ptr = (u32)c->dst.val; - break; /* 64b: zero-ext */ - case 8: - *c->dst.ptr = c->dst.val; - break; - } - break; - case OP_MEM: - if (c->lock_prefix) - rc = ops->cmpxchg_emulated( - (unsigned long)c->dst.ptr, - &c->dst.orig_val, - &c->dst.val, - c->dst.bytes, - ctxt->vcpu); - else - rc = ops->write_emulated( - (unsigned long)c->dst.ptr, - &c->dst.val, - c->dst.bytes, - ctxt->vcpu); - if (rc != X86EMUL_CONTINUE) - return rc; - break; - case OP_NONE: - /* no writeback */ - break; - default: - break; - } - return X86EMUL_CONTINUE; -} - -static void toggle_interruptibility(struct x86_emulate_ctxt *ctxt, u32 mask) -{ - u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(ctxt->vcpu, mask); - /* - * an sti; sti; sequence only disable interrupts for the first - * instruction. So, if the last instruction, be it emulated or - * not, left the system with the INT_STI flag enabled, it - * means that the last instruction is an sti. We should not - * leave the flag on in this case. The same goes for mov ss - */ - if (!(int_shadow & mask)) - ctxt->interruptibility = mask; -} - static inline void setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, - struct kvm_segment *cs, struct kvm_segment *ss) + struct x86_emulate_ops *ops, struct desc_struct *cs, + struct desc_struct *ss) { - memset(cs, 0, sizeof(struct kvm_segment)); - kvm_x86_ops->get_segment(ctxt->vcpu, cs, VCPU_SREG_CS); - memset(ss, 0, sizeof(struct kvm_segment)); + memset(cs, 0, sizeof(struct desc_struct)); + ops->get_cached_descriptor(cs, VCPU_SREG_CS, ctxt->vcpu); + memset(ss, 0, sizeof(struct desc_struct)); cs->l = 0; /* will be adjusted later */ - cs->base = 0; /* flat segment */ + set_desc_base(cs, 0); /* flat segment */ cs->g = 1; /* 4kb granularity */ - cs->limit = 0xffffffff; /* 4GB limit */ + set_desc_limit(cs, 0xfffff); /* 4GB limit */ cs->type = 0x0b; /* Read, Execute, Accessed */ cs->s = 1; cs->dpl = 0; /* will be adjusted later */ - cs->present = 1; - cs->db = 1; + cs->p = 1; + cs->d = 1; - ss->unusable = 0; - ss->base = 0; /* flat segment */ - ss->limit = 0xffffffff; /* 4GB limit */ + set_desc_base(ss, 0); /* flat segment */ + set_desc_limit(ss, 0xfffff); /* 4GB limit */ ss->g = 1; /* 4kb granularity */ ss->s = 1; ss->type = 0x03; /* Read/Write, Accessed */ - ss->db = 1; /* 32bit stack segment */ + ss->d = 1; /* 32bit stack segment */ ss->dpl = 0; - ss->present = 1; + ss->p = 1; } static int -emulate_syscall(struct x86_emulate_ctxt *ctxt) +emulate_syscall(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; - struct kvm_segment cs, ss; + struct desc_struct cs, ss; u64 msr_data; + u16 cs_sel, ss_sel; /* syscall is not available in real mode */ if (ctxt->mode == X86EMUL_MODE_REAL || ctxt->mode == X86EMUL_MODE_VM86) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); return X86EMUL_PROPAGATE_FAULT; } - setup_syscalls_segments(ctxt, &cs, &ss); + setup_syscalls_segments(ctxt, ops, &cs, &ss); - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); msr_data >>= 32; - cs.selector = (u16)(msr_data & 0xfffc); - ss.selector = (u16)(msr_data + 8); + cs_sel = (u16)(msr_data & 0xfffc); + ss_sel = (u16)(msr_data + 8); if (is_long_mode(ctxt->vcpu)) { - cs.db = 0; + cs.d = 0; cs.l = 1; } - kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS); - kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS); + ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); + ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); + ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); + ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); c->regs[VCPU_REGS_RCX] = c->eip; if (is_long_mode(ctxt->vcpu)) { #ifdef CONFIG_X86_64 c->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF; - kvm_x86_ops->get_msr(ctxt->vcpu, - ctxt->mode == X86EMUL_MODE_PROT64 ? - MSR_LSTAR : MSR_CSTAR, &msr_data); + ops->get_msr(ctxt->vcpu, + ctxt->mode == X86EMUL_MODE_PROT64 ? + MSR_LSTAR : MSR_CSTAR, &msr_data); c->eip = msr_data; - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_SYSCALL_MASK, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_SYSCALL_MASK, &msr_data); ctxt->eflags &= ~(msr_data | EFLG_RF); #endif } else { /* legacy mode */ - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data); c->eip = (u32)msr_data; ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); @@ -1896,15 +1991,16 @@ emulate_syscall(struct x86_emulate_ctxt *ctxt) } static int -emulate_sysenter(struct x86_emulate_ctxt *ctxt) +emulate_sysenter(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; - struct kvm_segment cs, ss; + struct desc_struct cs, ss; u64 msr_data; + u16 cs_sel, ss_sel; /* inject #GP if in real mode */ if (ctxt->mode == X86EMUL_MODE_REAL) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } @@ -1912,67 +2008,70 @@ emulate_sysenter(struct x86_emulate_ctxt *ctxt) * Therefore, we inject an #UD. */ if (ctxt->mode == X86EMUL_MODE_PROT64) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); return X86EMUL_PROPAGATE_FAULT; } - setup_syscalls_segments(ctxt, &cs, &ss); + setup_syscalls_segments(ctxt, ops, &cs, &ss); - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); switch (ctxt->mode) { case X86EMUL_MODE_PROT32: if ((msr_data & 0xfffc) == 0x0) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } break; case X86EMUL_MODE_PROT64: if (msr_data == 0x0) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } break; } ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); - cs.selector = (u16)msr_data; - cs.selector &= ~SELECTOR_RPL_MASK; - ss.selector = cs.selector + 8; - ss.selector &= ~SELECTOR_RPL_MASK; + cs_sel = (u16)msr_data; + cs_sel &= ~SELECTOR_RPL_MASK; + ss_sel = cs_sel + 8; + ss_sel &= ~SELECTOR_RPL_MASK; if (ctxt->mode == X86EMUL_MODE_PROT64 || is_long_mode(ctxt->vcpu)) { - cs.db = 0; + cs.d = 0; cs.l = 1; } - kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS); - kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS); + ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); + ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); + ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); + ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_EIP, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_EIP, &msr_data); c->eip = msr_data; - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_ESP, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_ESP, &msr_data); c->regs[VCPU_REGS_RSP] = msr_data; return X86EMUL_CONTINUE; } static int -emulate_sysexit(struct x86_emulate_ctxt *ctxt) +emulate_sysexit(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; - struct kvm_segment cs, ss; + struct desc_struct cs, ss; u64 msr_data; int usermode; + u16 cs_sel, ss_sel; /* inject #GP if in real mode or Virtual 8086 mode */ if (ctxt->mode == X86EMUL_MODE_REAL || ctxt->mode == X86EMUL_MODE_VM86) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } - setup_syscalls_segments(ctxt, &cs, &ss); + setup_syscalls_segments(ctxt, ops, &cs, &ss); if ((c->rex_prefix & 0x8) != 0x0) usermode = X86EMUL_MODE_PROT64; @@ -1981,35 +2080,37 @@ emulate_sysexit(struct x86_emulate_ctxt *ctxt) cs.dpl = 3; ss.dpl = 3; - kvm_x86_ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); + ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data); switch (usermode) { case X86EMUL_MODE_PROT32: - cs.selector = (u16)(msr_data + 16); + cs_sel = (u16)(msr_data + 16); if ((msr_data & 0xfffc) == 0x0) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } - ss.selector = (u16)(msr_data + 24); + ss_sel = (u16)(msr_data + 24); break; case X86EMUL_MODE_PROT64: - cs.selector = (u16)(msr_data + 32); + cs_sel = (u16)(msr_data + 32); if (msr_data == 0x0) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } - ss.selector = cs.selector + 8; - cs.db = 0; + ss_sel = cs_sel + 8; + cs.d = 0; cs.l = 1; break; } - cs.selector |= SELECTOR_RPL_MASK; - ss.selector |= SELECTOR_RPL_MASK; + cs_sel |= SELECTOR_RPL_MASK; + ss_sel |= SELECTOR_RPL_MASK; - kvm_x86_ops->set_segment(ctxt->vcpu, &cs, VCPU_SREG_CS); - kvm_x86_ops->set_segment(ctxt->vcpu, &ss, VCPU_SREG_SS); + ops->set_cached_descriptor(&cs, VCPU_SREG_CS, ctxt->vcpu); + ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu); + ops->set_cached_descriptor(&ss, VCPU_SREG_SS, ctxt->vcpu); + ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu); - c->eip = ctxt->vcpu->arch.regs[VCPU_REGS_RDX]; - c->regs[VCPU_REGS_RSP] = ctxt->vcpu->arch.regs[VCPU_REGS_RCX]; + c->eip = c->regs[VCPU_REGS_RDX]; + c->regs[VCPU_REGS_RSP] = c->regs[VCPU_REGS_RCX]; return X86EMUL_CONTINUE; } @@ -2030,25 +2131,25 @@ static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops, u16 port, u16 len) { - struct kvm_segment tr_seg; + struct desc_struct tr_seg; int r; u16 io_bitmap_ptr; u8 perm, bit_idx = port & 0x7; unsigned mask = (1 << len) - 1; - kvm_get_segment(ctxt->vcpu, &tr_seg, VCPU_SREG_TR); - if (tr_seg.unusable) + ops->get_cached_descriptor(&tr_seg, VCPU_SREG_TR, ctxt->vcpu); + if (!tr_seg.p) return false; - if (tr_seg.limit < 103) + if (desc_limit_scaled(&tr_seg) < 103) return false; - r = ops->read_std(tr_seg.base + 102, &io_bitmap_ptr, 2, ctxt->vcpu, - NULL); + r = ops->read_std(get_desc_base(&tr_seg) + 102, &io_bitmap_ptr, 2, + ctxt->vcpu, NULL); if (r != X86EMUL_CONTINUE) return false; - if (io_bitmap_ptr + port/8 > tr_seg.limit) + if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg)) return false; - r = ops->read_std(tr_seg.base + io_bitmap_ptr + port/8, &perm, 1, - ctxt->vcpu, NULL); + r = ops->read_std(get_desc_base(&tr_seg) + io_bitmap_ptr + port/8, + &perm, 1, ctxt->vcpu, NULL); if (r != X86EMUL_CONTINUE) return false; if ((perm >> bit_idx) & mask) @@ -2066,17 +2167,6 @@ static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt, return true; } -static u32 get_cached_descriptor_base(struct x86_emulate_ctxt *ctxt, - struct x86_emulate_ops *ops, - int seg) -{ - struct desc_struct desc; - if (ops->get_cached_descriptor(&desc, seg, ctxt->vcpu)) - return get_desc_base(&desc); - else - return ~0; -} - static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops, struct tss_segment_16 *tss) @@ -2165,7 +2255,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, old_tss_base, err); + emulate_pf(ctxt, old_tss_base, err); return ret; } @@ -2175,7 +2265,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, old_tss_base, err); + emulate_pf(ctxt, old_tss_base, err); return ret; } @@ -2183,7 +2273,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, new_tss_base, err); + emulate_pf(ctxt, new_tss_base, err); return ret; } @@ -2196,7 +2286,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt, ctxt->vcpu, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, new_tss_base, err); + emulate_pf(ctxt, new_tss_base, err); return ret; } } @@ -2238,7 +2328,10 @@ static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, struct decode_cache *c = &ctxt->decode; int ret; - ops->set_cr(3, tss->cr3, ctxt->vcpu); + if (ops->set_cr(3, tss->cr3, ctxt->vcpu)) { + emulate_gp(ctxt, 0); + return X86EMUL_PROPAGATE_FAULT; + } c->eip = tss->eip; ctxt->eflags = tss->eflags | 2; c->regs[VCPU_REGS_RAX] = tss->eax; @@ -2304,7 +2397,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, old_tss_base, err); + emulate_pf(ctxt, old_tss_base, err); return ret; } @@ -2314,7 +2407,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, old_tss_base, err); + emulate_pf(ctxt, old_tss_base, err); return ret; } @@ -2322,7 +2415,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, new_tss_base, err); + emulate_pf(ctxt, new_tss_base, err); return ret; } @@ -2335,7 +2428,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt, ctxt->vcpu, &err); if (ret == X86EMUL_PROPAGATE_FAULT) { /* FIXME: need to provide precise fault address */ - kvm_inject_page_fault(ctxt->vcpu, new_tss_base, err); + emulate_pf(ctxt, new_tss_base, err); return ret; } } @@ -2352,7 +2445,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, int ret; u16 old_tss_sel = ops->get_segment_selector(VCPU_SREG_TR, ctxt->vcpu); ulong old_tss_base = - get_cached_descriptor_base(ctxt, ops, VCPU_SREG_TR); + ops->get_cached_segment_base(VCPU_SREG_TR, ctxt->vcpu); u32 desc_limit; /* FIXME: old_tss_base == ~0 ? */ @@ -2369,7 +2462,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, if (reason != TASK_SWITCH_IRET) { if ((tss_selector & 3) > next_tss_desc.dpl || ops->cpl(ctxt->vcpu) > next_tss_desc.dpl) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); return X86EMUL_PROPAGATE_FAULT; } } @@ -2378,8 +2471,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, if (!next_tss_desc.p || ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || desc_limit < 0x2b)) { - kvm_queue_exception_e(ctxt->vcpu, TS_VECTOR, - tss_selector & 0xfffc); + emulate_ts(ctxt, tss_selector & 0xfffc); return X86EMUL_PROPAGATE_FAULT; } @@ -2425,7 +2517,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2; c->lock_prefix = 0; c->src.val = (unsigned long) error_code; - emulate_push(ctxt); + emulate_push(ctxt, ops); } return ret; @@ -2439,18 +2531,16 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt, struct decode_cache *c = &ctxt->decode; int rc; - memset(c, 0, sizeof(struct decode_cache)); c->eip = ctxt->eip; - memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); c->dst.type = OP_NONE; rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason, has_error_code, error_code); if (rc == X86EMUL_CONTINUE) { - memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs); - kvm_rip_write(ctxt->vcpu, c->eip); rc = writeback(ctxt, ops); + if (rc == X86EMUL_CONTINUE) + ctxt->eip = c->eip; } return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; @@ -2474,29 +2564,22 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) int rc = X86EMUL_CONTINUE; int saved_dst_type = c->dst.type; - ctxt->interruptibility = 0; - - /* Shadow copy of register state. Committed on successful emulation. - * NOTE: we can copy them from vcpu as x86_decode_insn() doesn't - * modify them. - */ - - memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); + ctxt->decode.mem_read.pos = 0; if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; } /* LOCK prefix is allowed only with some instructions */ if (c->lock_prefix && (!(c->d & Lock) || c->dst.type != OP_MEM)) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; } /* Privileged instruction can be executed only in CPL=0 */ if ((c->d & Priv) && ops->cpl(ctxt->vcpu)) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); goto done; } @@ -2506,7 +2589,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) { string_done: ctxt->restart = false; - kvm_rip_write(ctxt->vcpu, c->eip); + ctxt->eip = c->eip; goto done; } /* The second termination condition only applies for REPE @@ -2529,20 +2612,16 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) } if (c->src.type == OP_MEM) { - rc = ops->read_emulated((unsigned long)c->src.ptr, - &c->src.val, - c->src.bytes, - ctxt->vcpu); + rc = read_emulated(ctxt, ops, (unsigned long)c->src.ptr, + c->src.valptr, c->src.bytes); if (rc != X86EMUL_CONTINUE) goto done; c->src.orig_val = c->src.val; } if (c->src2.type == OP_MEM) { - rc = ops->read_emulated((unsigned long)c->src2.ptr, - &c->src2.val, - c->src2.bytes, - ctxt->vcpu); + rc = read_emulated(ctxt, ops, (unsigned long)c->src2.ptr, + &c->src2.val, c->src2.bytes); if (rc != X86EMUL_CONTINUE) goto done; } @@ -2553,8 +2632,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) if ((c->dst.type == OP_MEM) && !(c->d & Mov)) { /* optimisation - avoid slow emulated read if Mov */ - rc = ops->read_emulated((unsigned long)c->dst.ptr, &c->dst.val, - c->dst.bytes, ctxt->vcpu); + rc = read_emulated(ctxt, ops, (unsigned long)c->dst.ptr, + &c->dst.val, c->dst.bytes); if (rc != X86EMUL_CONTINUE) goto done; } @@ -2571,7 +2650,7 @@ special_insn: emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags); break; case 0x06: /* push es */ - emulate_push_sreg(ctxt, VCPU_SREG_ES); + emulate_push_sreg(ctxt, ops, VCPU_SREG_ES); break; case 0x07: /* pop es */ rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES); @@ -2583,14 +2662,14 @@ special_insn: emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags); break; case 0x0e: /* push cs */ - emulate_push_sreg(ctxt, VCPU_SREG_CS); + emulate_push_sreg(ctxt, ops, VCPU_SREG_CS); break; case 0x10 ... 0x15: adc: /* adc */ emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags); break; case 0x16: /* push ss */ - emulate_push_sreg(ctxt, VCPU_SREG_SS); + emulate_push_sreg(ctxt, ops, VCPU_SREG_SS); break; case 0x17: /* pop ss */ rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS); @@ -2602,7 +2681,7 @@ special_insn: emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags); break; case 0x1e: /* push ds */ - emulate_push_sreg(ctxt, VCPU_SREG_DS); + emulate_push_sreg(ctxt, ops, VCPU_SREG_DS); break; case 0x1f: /* pop ds */ rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS); @@ -2632,7 +2711,7 @@ special_insn: emulate_1op("dec", c->dst, ctxt->eflags); break; case 0x50 ... 0x57: /* push reg */ - emulate_push(ctxt); + emulate_push(ctxt, ops); break; case 0x58 ... 0x5f: /* pop reg */ pop_instruction: @@ -2641,7 +2720,9 @@ special_insn: goto done; break; case 0x60: /* pusha */ - emulate_pusha(ctxt); + rc = emulate_pusha(ctxt, ops); + if (rc != X86EMUL_CONTINUE) + goto done; break; case 0x61: /* popa */ rc = emulate_popa(ctxt, ops); @@ -2655,14 +2736,14 @@ special_insn: break; case 0x68: /* push imm */ case 0x6a: /* push imm8 */ - emulate_push(ctxt); + emulate_push(ctxt, ops); break; case 0x6c: /* insb */ case 0x6d: /* insw/insd */ c->dst.bytes = min(c->dst.bytes, 4u); if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX], c->dst.bytes)) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); goto done; } if (!pio_in_emulated(ctxt, ops, c->dst.bytes, @@ -2674,7 +2755,7 @@ special_insn: c->src.bytes = min(c->src.bytes, 4u); if (!emulator_io_permited(ctxt, ops, c->regs[VCPU_REGS_RDX], c->src.bytes)) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); goto done; } ops->pio_out_emulated(c->src.bytes, c->regs[VCPU_REGS_RDX], @@ -2707,6 +2788,7 @@ special_insn: } break; case 0x84 ... 0x85: + test: emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags); break; case 0x86 ... 0x87: /* xchg */ @@ -2735,18 +2817,13 @@ special_insn: break; case 0x88 ... 0x8b: /* mov */ goto mov; - case 0x8c: { /* mov r/m, sreg */ - struct kvm_segment segreg; - - if (c->modrm_reg <= VCPU_SREG_GS) - kvm_get_segment(ctxt->vcpu, &segreg, c->modrm_reg); - else { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + case 0x8c: /* mov r/m, sreg */ + if (c->modrm_reg > VCPU_SREG_GS) { + emulate_ud(ctxt); goto done; } - c->dst.val = segreg.selector; + c->dst.val = ops->get_segment_selector(c->modrm_reg, ctxt->vcpu); break; - } case 0x8d: /* lea r16/r32, m */ c->dst.val = c->modrm_ea; break; @@ -2757,12 +2834,12 @@ special_insn: if (c->modrm_reg == VCPU_SREG_CS || c->modrm_reg > VCPU_SREG_GS) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; } if (c->modrm_reg == VCPU_SREG_SS) - toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_MOV_SS); + ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS; rc = load_segment_descriptor(ctxt, ops, sel, c->modrm_reg); @@ -2775,19 +2852,19 @@ special_insn: goto done; break; case 0x90: /* nop / xchg r8,rax */ - if (!(c->rex_prefix & 1)) { /* nop */ - c->dst.type = OP_NONE; + if (c->dst.ptr == (unsigned long *)&c->regs[VCPU_REGS_RAX]) { + c->dst.type = OP_NONE; /* nop */ break; } case 0x91 ... 0x97: /* xchg reg,rax */ - c->src.type = c->dst.type = OP_REG; - c->src.bytes = c->dst.bytes = c->op_bytes; + c->src.type = OP_REG; + c->src.bytes = c->op_bytes; c->src.ptr = (unsigned long *) &c->regs[VCPU_REGS_RAX]; c->src.val = *(c->src.ptr); goto xchg; case 0x9c: /* pushf */ c->src.val = (unsigned long) ctxt->eflags; - emulate_push(ctxt); + emulate_push(ctxt, ops); break; case 0x9d: /* popf */ c->dst.type = OP_REG; @@ -2797,19 +2874,15 @@ special_insn: if (rc != X86EMUL_CONTINUE) goto done; break; - case 0xa0 ... 0xa1: /* mov */ - c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; - c->dst.val = c->src.val; - break; - case 0xa2 ... 0xa3: /* mov */ - c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX]; - break; + case 0xa0 ... 0xa3: /* mov */ case 0xa4 ... 0xa5: /* movs */ goto mov; case 0xa6 ... 0xa7: /* cmps */ c->dst.type = OP_NONE; /* Disable writeback. */ DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.ptr, c->dst.ptr); goto cmp; + case 0xa8 ... 0xa9: /* test ax, imm */ + goto test; case 0xaa ... 0xab: /* stos */ c->dst.val = c->regs[VCPU_REGS_RAX]; break; @@ -2855,19 +2928,23 @@ special_insn: long int rel = c->src.val; c->src.val = (unsigned long) c->eip; jmp_rel(c, rel); - emulate_push(ctxt); + emulate_push(ctxt, ops); break; } case 0xe9: /* jmp rel */ goto jmp; - case 0xea: /* jmp far */ + case 0xea: { /* jmp far */ + unsigned short sel; jump_far: - if (load_segment_descriptor(ctxt, ops, c->src2.val, - VCPU_SREG_CS)) + memcpy(&sel, c->src.valptr + c->op_bytes, 2); + + if (load_segment_descriptor(ctxt, ops, sel, VCPU_SREG_CS)) goto done; - c->eip = c->src.val; + c->eip = 0; + memcpy(&c->eip, c->src.valptr, c->op_bytes); break; + } case 0xeb: jmp: /* jmp rel short */ jmp_rel(c, c->src.val); @@ -2879,20 +2956,20 @@ special_insn: do_io_in: c->dst.bytes = min(c->dst.bytes, 4u); if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); goto done; } if (!pio_in_emulated(ctxt, ops, c->dst.bytes, c->src.val, &c->dst.val)) goto done; /* IO is needed */ break; - case 0xee: /* out al,dx */ - case 0xef: /* out (e/r)ax,dx */ + case 0xee: /* out dx,al */ + case 0xef: /* out dx,(e/r)ax */ c->src.val = c->regs[VCPU_REGS_RDX]; do_io_out: c->dst.bytes = min(c->dst.bytes, 4u); if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) { - kvm_inject_gp(ctxt->vcpu, 0); + emulate_gp(ctxt, 0); goto done; } ops->pio_out_emulated(c->dst.bytes, c->src.val, &c->dst.val, 1, @@ -2916,18 +2993,20 @@ special_insn: c->dst.type = OP_NONE; /* Disable writeback. */ break; case 0xfa: /* cli */ - if (emulator_bad_iopl(ctxt, ops)) - kvm_inject_gp(ctxt->vcpu, 0); - else { + if (emulator_bad_iopl(ctxt, ops)) { + emulate_gp(ctxt, 0); + goto done; + } else { ctxt->eflags &= ~X86_EFLAGS_IF; c->dst.type = OP_NONE; /* Disable writeback. */ } break; case 0xfb: /* sti */ - if (emulator_bad_iopl(ctxt, ops)) - kvm_inject_gp(ctxt->vcpu, 0); - else { - toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_STI); + if (emulator_bad_iopl(ctxt, ops)) { + emulate_gp(ctxt, 0); + goto done; + } else { + ctxt->interruptibility = KVM_X86_SHADOW_INT_STI; ctxt->eflags |= X86_EFLAGS_IF; c->dst.type = OP_NONE; /* Disable writeback. */ } @@ -2964,11 +3043,12 @@ writeback: c->dst.type = saved_dst_type; if ((c->d & SrcMask) == SrcSI) - string_addr_inc(ctxt, seg_override_base(ctxt, c), VCPU_REGS_RSI, - &c->src); + string_addr_inc(ctxt, seg_override_base(ctxt, ops, c), + VCPU_REGS_RSI, &c->src); if ((c->d & DstMask) == DstDI) - string_addr_inc(ctxt, es_base(ctxt), VCPU_REGS_RDI, &c->dst); + string_addr_inc(ctxt, es_base(ctxt, ops), VCPU_REGS_RDI, + &c->dst); if (c->rep_prefix && (c->d & String)) { struct read_cache *rc = &ctxt->decode.io_read; @@ -2981,11 +3061,12 @@ writeback: (rc->end != 0 && rc->end == rc->pos)) ctxt->restart = false; } - - /* Commit shadow register state. */ - memcpy(ctxt->vcpu->arch.regs, c->regs, sizeof c->regs); - kvm_rip_write(ctxt->vcpu, c->eip); - ops->set_rflags(ctxt->vcpu, ctxt->eflags); + /* + * reset read cache here in case string instruction is restared + * without decoding + */ + ctxt->decode.mem_read.end = 0; + ctxt->eip = c->eip; done: return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; @@ -3051,7 +3132,7 @@ twobyte_insn: c->dst.type = OP_NONE; break; case 5: /* not defined */ - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; case 7: /* invlpg*/ emulate_invlpg(ctxt->vcpu, c->modrm_ea); @@ -3063,7 +3144,7 @@ twobyte_insn: } break; case 0x05: /* syscall */ - rc = emulate_syscall(ctxt); + rc = emulate_syscall(ctxt, ops); if (rc != X86EMUL_CONTINUE) goto done; else @@ -3073,8 +3154,11 @@ twobyte_insn: emulate_clts(ctxt->vcpu); c->dst.type = OP_NONE; break; - case 0x08: /* invd */ case 0x09: /* wbinvd */ + kvm_emulate_wbinvd(ctxt->vcpu); + c->dst.type = OP_NONE; + break; + case 0x08: /* invd */ case 0x0d: /* GrpP (prefetch) */ case 0x18: /* Grp16 (prefetch/nop) */ c->dst.type = OP_NONE; @@ -3084,7 +3168,7 @@ twobyte_insn: case 1: case 5 ... 7: case 9 ... 15: - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; } c->regs[c->modrm_rm] = ops->get_cr(c->modrm_reg, ctxt->vcpu); @@ -3093,31 +3177,42 @@ twobyte_insn: case 0x21: /* mov from dr to reg */ if ((ops->get_cr(4, ctxt->vcpu) & X86_CR4_DE) && (c->modrm_reg == 4 || c->modrm_reg == 5)) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); goto done; } - emulator_get_dr(ctxt, c->modrm_reg, &c->regs[c->modrm_rm]); + ops->get_dr(c->modrm_reg, &c->regs[c->modrm_rm], ctxt->vcpu); c->dst.type = OP_NONE; /* no writeback */ break; case 0x22: /* mov reg, cr */ - ops->set_cr(c->modrm_reg, c->modrm_val, ctxt->vcpu); + if (ops->set_cr(c->modrm_reg, c->modrm_val, ctxt->vcpu)) { + emulate_gp(ctxt, 0); + goto done; + } c->dst.type = OP_NONE; break; case 0x23: /* mov from reg to dr */ if ((ops->get_cr(4, ctxt->vcpu) & X86_CR4_DE) && (c->modrm_reg == 4 || c->modrm_reg == 5)) { - kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + emulate_ud(ctxt); + goto done; + } + + if (ops->set_dr(c->modrm_reg, c->regs[c->modrm_rm] & + ((ctxt->mode == X86EMUL_MODE_PROT64) ? + ~0ULL : ~0U), ctxt->vcpu) < 0) { + /* #UD condition is already handled by the code above */ + emulate_gp(ctxt, 0); goto done; } - emulator_set_dr(ctxt, c->modrm_reg, c->regs[c->modrm_rm]); + c->dst.type = OP_NONE; /* no writeback */ break; case 0x30: /* wrmsr */ msr_data = (u32)c->regs[VCPU_REGS_RAX] | ((u64)c->regs[VCPU_REGS_RDX] << 32); - if (kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) { - kvm_inject_gp(ctxt->vcpu, 0); + if (ops->set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) { + emulate_gp(ctxt, 0); goto done; } rc = X86EMUL_CONTINUE; @@ -3125,8 +3220,8 @@ twobyte_insn: break; case 0x32: /* rdmsr */ - if (kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) { - kvm_inject_gp(ctxt->vcpu, 0); + if (ops->get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) { + emulate_gp(ctxt, 0); goto done; } else { c->regs[VCPU_REGS_RAX] = (u32)msr_data; @@ -3136,14 +3231,14 @@ twobyte_insn: c->dst.type = OP_NONE; break; case 0x34: /* sysenter */ - rc = emulate_sysenter(ctxt); + rc = emulate_sysenter(ctxt, ops); if (rc != X86EMUL_CONTINUE) goto done; else goto writeback; break; case 0x35: /* sysexit */ - rc = emulate_sysexit(ctxt); + rc = emulate_sysexit(ctxt, ops); if (rc != X86EMUL_CONTINUE) goto done; else @@ -3160,7 +3255,7 @@ twobyte_insn: c->dst.type = OP_NONE; break; case 0xa0: /* push fs */ - emulate_push_sreg(ctxt, VCPU_SREG_FS); + emulate_push_sreg(ctxt, ops, VCPU_SREG_FS); break; case 0xa1: /* pop fs */ rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS); @@ -3179,7 +3274,7 @@ twobyte_insn: emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags); break; case 0xa8: /* push gs */ - emulate_push_sreg(ctxt, VCPU_SREG_GS); + emulate_push_sreg(ctxt, ops, VCPU_SREG_GS); break; case 0xa9: /* pop gs */ rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS); |
