diff options
| author | Paolo Bonzini | 2013-05-09 11:32:50 +0200 |
|---|---|---|
| committer | Gleb Natapov | 2013-05-09 13:14:51 +0300 |
| commit | 7fa57952d70f5737513d8319395e471d107e4e0d (patch) | |
| tree | 14f9c0ab4a76f2f065a5f891e381809d20a740ba /arch/x86 | |
| parent | a035d5c64d08a8ac12d81b596e7fa6d95a73c347 (diff) | |
KVM: emulator: emulate XLAT
This is used by SGABIOS, KVM breaks with emulate_invalid_guest_state=1.
It is just a MOV in disguise, with a funny source address.
Reported-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: stable@vger.kernel.org # 3.9
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 55322a7c113d..a06a550c2db8 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -60,6 +60,7 @@ #define OpGS 25ull /* GS */ #define OpMem8 26ull /* 8-bit zero extended memory operand */ #define OpImm64 27ull /* Sign extended 16/32/64-bit immediate */ +#define OpXLat 28ull /* memory at BX/EBX/RBX + zero-extended AL */ #define OpBits 5 /* Width of operand field */ #define OpMask ((1ull << OpBits) - 1) @@ -99,6 +100,7 @@ #define SrcImmUByte (OpImmUByte << SrcShift) #define SrcImmU (OpImmU << SrcShift) #define SrcSI (OpSI << SrcShift) +#define SrcXLat (OpXLat << SrcShift) #define SrcImmFAddr (OpImmFAddr << SrcShift) #define SrcMemFAddr (OpMemFAddr << SrcShift) #define SrcAcc (OpAcc << SrcShift) @@ -3959,7 +3961,8 @@ static const struct opcode opcode_table[256] = { G(Src2One | ByteOp, group2), G(Src2One, group2), G(Src2CL | ByteOp, group2), G(Src2CL, group2), I(DstAcc | SrcImmUByte | No64, em_aam), - I(DstAcc | SrcImmUByte | No64, em_aad), N, N, + I(DstAcc | SrcImmUByte | No64, em_aad), N, + I(DstAcc | SrcXLat | ByteOp, em_mov), /* 0xD8 - 0xDF */ N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N, /* 0xE0 - 0xE7 */ @@ -4221,6 +4224,16 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, op->val = 0; op->count = 1; break; + case OpXLat: + op->type = OP_MEM; + op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; + op->addr.mem.ea = + register_address(ctxt, + reg_read(ctxt, VCPU_REGS_RBX) + + (reg_read(ctxt, VCPU_REGS_RAX) & 0xff)); + op->addr.mem.seg = seg_override(ctxt); + op->val = 0; + break; case OpImmFAddr: op->type = OP_IMM; op->addr.mem.ea = ctxt->_eip; |