| From | Greg Kroah-Hartman <> | Subject | [ 43/46] KVM: x86 emulator: fix byte-sized MOVZX/MOVSX | Date | Sun, 19 Aug 2012 20:59:19 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.5-stable review patch. If anyone has any objections, please let me know.
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From: Avi Kivity <avi@redhat.com>
(cherry picked from commit 361cad2b50a2c92b91b6f568db860fabad3bf149)
Commit 2adb5ad9fe1 removed ByteOp from MOVZX/MOVSX, replacing them by SrcMem8, but neglected to fix the dependency in the emulation code on ByteOp. This caused the instruction not to have any effect in some circumstances.
Fix by replacing the check for ByteOp with the equivalent src.op_bytes == 1.
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/x86/kvm/emulate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4426,12 +4426,12 @@ twobyte_insn: break; case 0xb6 ... 0xb7: /* movzx */ ctxt->dst.bytes = ctxt->op_bytes; - ctxt->dst.val = (ctxt->d & ByteOp) ? (u8) ctxt->src.val + ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val : (u16) ctxt->src.val; break; case 0xbe ... 0xbf: /* movsx */ ctxt->dst.bytes = ctxt->op_bytes; - ctxt->dst.val = (ctxt->d & ByteOp) ? (s8) ctxt->src.val : + ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val : (s16) ctxt->src.val; break; case 0xc0 ... 0xc1: /* xadd */
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