KVM: emulator: mark 0xff 0x7d opcode as undefined.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77b56d5..46f63b8 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3723,7 +3723,7 @@
 	I(SrcMemFAddr | ImplicitOps | Stack,	em_call_far),
 	I(SrcMem | Stack,			em_grp45),
 	I(SrcMemFAddr | ImplicitOps,		em_grp45),
-	I(SrcMem | Stack,			em_grp45), N,
+	I(SrcMem | Stack,			em_grp45), D(Undefined),
 };
 
 static const struct opcode group6[] = {