It is undefined and should generate #UD.
Signed-off-by: Gleb Natapov <g...@redhat.com>
---
arch/x86/kvm/emulate.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2df510b..1a32b78 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2486,6 +2486,9 @@ twobyte_insn:
(c->src.val & 0x0f), ctxt->vcpu);
c->dst.type = OP_NONE;
break;
+ case 5: /* not defined */
+ kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+ goto done;
case 7: /* invlpg*/
emulate_invlpg(ctxt->vcpu, memop);
/* Disable writeback. */
--
1.6.5
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