KVM: nVMX: Do not emulate #UD while in guest mode

While in L2, leave all #UD to L2 and do not try to emulate it. If L1 is
interested in doing this, it reports its interest via the exception
bitmap, and we never get into handle_exception of L0 anyway.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fbd949909628..50c675b46901 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5065,6 +5065,10 @@ static int handle_exception(struct kvm_vcpu *vcpu)
         }
 
         if (is_invalid_opcode(intr_info)) {
+                if (is_guest_mode(vcpu)) {
+                        kvm_queue_exception(vcpu, UD_VECTOR);
+                        return 1;
+                }
                 er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
                 if (er != EMULATE_DONE)
                         kvm_queue_exception(vcpu, UD_VECTOR);