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KVM: x86 emulator: qualify OpReg inhibit_byte_regs hack

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OpReg decoding has a hack that inhibits byte registers for movsx and movzx
instructions.  It should be replaced by something better, but meanwhile,
qualify that the hack is only active for the destination operand.

Note these instructions only use OpReg for the destination, but better to
be explicit about it.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2011-09-13 10:45:46 +03:00
parent 608aabe316
commit 5217973ef8
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/emulate.c
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@ -3346,6 +3346,7 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
switch (d) { switch (d) {
case OpReg: case OpReg:
decode_register_operand(ctxt, op, decode_register_operand(ctxt, op,
op == &ctxt->dst &&
ctxt->twobyte && (ctxt->b == 0xb6 || ctxt->b == 0xb7)); ctxt->twobyte && (ctxt->b == 0xb6 || ctxt->b == 0xb7));
break; break;
case OpImmUByte: case OpImmUByte: