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KVM: X86 emulator: fix source operand decoding for 8bit mov[zs]x instructions

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Source operand for one byte mov[zs]x is decoded incorrectly if it is in
high byte register. Fix that.

Cc: stable@vger.kernel.org
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Gleb Natapov 2013-04-24 13:38:36 +03:00
parent d1fa0352a1
commit 660696d1d1
1 changed files with 4 additions and 0 deletions
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arch/x86/kvm/emulate.c
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@ -4172,6 +4172,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
break;
case OpMem8:
ctxt->memop.bytes = 1;
if (ctxt->memop.type == OP_REG) {
ctxt->memop.addr.reg = decode_register(ctxt, ctxt->modrm_rm, 1);
fetch_register_operand(&ctxt->memop);
}
goto mem_common;
case OpMem16:
ctxt->memop.bytes = 2;