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@xxxxxxxxxxx>
---
Noticed while wondering where the vmmcall of a misconfigured L2 went on
an Intel box: to nowhere. This bug caused a spurious fixup, and the
emulator bug did not even let it trigger a vmcall vmexit.
arch/x86/kvm/vmx.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f7b20b4..fa0627c 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);
--
2.1.4
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