From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Mon, 9 Mar 2015 19:56:43 +0000 (+0100)
Subject: KVM: nVMX: Do not emulate #UD while in guest mode
X-Git-Tag: v4.13~5472^2~39
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=ae1f57670703656cc9f293722c3b8b6782f8ab3f;p=mirror_ubuntu-bionic-kernel.git

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>
---

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);