On 03/09/2010 04:09 PM, Gleb Natapov wrote:
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. */
Why is this needed? We can only get here if the guest tricks us (otherwise the #UD would go back to the guest, or rather, we'd trap it to see if it's a hypercall instruction, but not pass it on to the emulator).
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