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KVM: x86: movnti minimum op size of 32-bit is not kept

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If the operand-size prefix (0x66) is used in 64-bit mode, the emulator would
assume the destination operand is 64-bit, when it should be 32-bit.

Reminder: movnti does not support 16-bit operands and its default operand size
is 32-bit.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-06-02 18:34:08 +03:00 committed by Paolo Bonzini
parent 37c564f285
commit 3b32004a66
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/emulate.c
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@ -4836,8 +4836,8 @@ twobyte_insn:
break;
case 0xc3: /* movnti */
ctxt->dst.bytes = ctxt->op_bytes;
ctxt->dst.val = (ctxt->op_bytes == 4) ? (u32) ctxt->src.val :
(u64) ctxt->src.val;
ctxt->dst.val = (ctxt->op_bytes == 8) ? (u64) ctxt->src.val :
(u32) ctxt->src.val;
break;
default:
goto cannot_emulate;