From d8769fedd4e8323d8afea9a1b2bdebff4f1d2d37 Mon Sep 17 00:00:00 2001 From: Mohammed Gamal Date: Sun, 23 Aug 2009 14:24:25 +0300 Subject: [PATCH] KVM: x86 emulator: Introduce No64 decode option Introduces a new decode option "No64", which is used for instructions that are invalid in long mode. Signed-off-by: Mohammed Gamal Signed-off-by: Avi Kivity --- arch/x86/kvm/emulate.c | 42 ++++++++++++++---------------------------- 1 file changed, 14 insertions(+), 28 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 1cdfec5231d0..1f0ff4afa73e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -75,6 +75,8 @@ #define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */ #define GroupDual (1<<15) /* Alternate decoding of mod == 3 */ #define GroupMask 0xff /* Group number stored in bits 0:7 */ +/* Misc flags */ +#define No64 (1<<28) /* Source 2 operand type */ #define Src2None (0<<29) #define Src2CL (1<<29) @@ -93,21 +95,21 @@ static u32 opcode_table[256] = { ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, - ImplicitOps | Stack, ImplicitOps | Stack, + ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, /* 0x08 - 0x0F */ ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, - 0, 0, ImplicitOps | Stack, 0, + 0, 0, ImplicitOps | Stack | No64, 0, /* 0x10 - 0x17 */ ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, - ImplicitOps | Stack, ImplicitOps | Stack, + ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, /* 0x18 - 0x1F */ ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, - ImplicitOps | Stack, ImplicitOps | Stack, + ImplicitOps | Stack | No64, ImplicitOps | Stack | No64, /* 0x20 - 0x27 */ ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, @@ -161,7 +163,7 @@ static u32 opcode_table[256] = { /* 0x90 - 0x97 */ DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, DstReg, /* 0x98 - 0x9F */ - 0, 0, SrcImm | Src2Imm16, 0, + 0, 0, SrcImm | Src2Imm16 | No64, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0, /* 0xA0 - 0xA7 */ ByteOp | DstReg | SrcMem | Mov | MemAbs, DstReg | SrcMem | Mov | MemAbs, @@ -188,7 +190,7 @@ static u32 opcode_table[256] = { ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov, /* 0xC8 - 0xCF */ 0, 0, 0, ImplicitOps | Stack, - ImplicitOps, SrcImmByte, ImplicitOps, ImplicitOps, + ImplicitOps, SrcImmByte, ImplicitOps | No64, ImplicitOps, /* 0xD0 - 0xD7 */ ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, @@ -201,7 +203,7 @@ static u32 opcode_table[256] = { ByteOp | SrcImmUByte, SrcImmUByte, /* 0xE8 - 0xEF */ SrcImm | Stack, SrcImm | ImplicitOps, - SrcImmU | Src2Imm16, SrcImmByte | ImplicitOps, + SrcImmU | Src2Imm16 | No64, SrcImmByte | ImplicitOps, SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* 0xF0 - 0xF7 */ @@ -967,6 +969,11 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) } } + if (mode == X86EMUL_MODE_PROT64 && (c->d & No64)) { + kvm_report_emulation_failure(ctxt->vcpu, "invalid x86/64 instruction");; + return -1; + } + if (c->d & Group) { group = c->d & GroupMask; c->modrm = insn_fetch(u8, 1, c->eip); @@ -1739,15 +1746,9 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags); break; case 0x06: /* push es */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - emulate_push_sreg(ctxt, VCPU_SREG_ES); break; case 0x07: /* pop es */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES); if (rc != 0) goto done; @@ -1757,9 +1758,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags); break; case 0x0e: /* push cs */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - emulate_push_sreg(ctxt, VCPU_SREG_CS); break; case 0x10 ... 0x15: @@ -1767,15 +1765,9 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags); break; case 0x16: /* push ss */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - emulate_push_sreg(ctxt, VCPU_SREG_SS); break; case 0x17: /* pop ss */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS); if (rc != 0) goto done; @@ -1785,15 +1777,9 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags); break; case 0x1e: /* push ds */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - emulate_push_sreg(ctxt, VCPU_SREG_DS); break; case 0x1f: /* pop ds */ - if (ctxt->mode == X86EMUL_MODE_PROT64) - goto cannot_emulate; - rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS); if (rc != 0) goto done; -- GitLab