KVM: nVMX: Always handle #VEs in L0 (never forward #VEs from L2 to L1)

Always handle #VEs, e.g. due to prove EPT Violation #VE failures, in L0,
as KVM does not expose any #VE capabilities to L1, i.e. any and all #VEs
are KVM's responsibility.

Fixes: 8131cf5b ("KVM: VMX: Introduce test mode related to EPT violation VE")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20240518000430.1118488-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/nested.c

@@ -6233,6 +6233,8 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu,
 		else if (is_alignment_check(intr_info) &&
 			 !vmx_guest_inject_ac(vcpu))
 			return true;
+		else if (is_ve_fault(intr_info))
+			return true;
 		return false;
 	case EXIT_REASON_EXTERNAL_INTERRUPT:
 		return true;