From e1de91ccab311ec8007c6e77b0dbb4e3421fd298 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <sean.j.christopherson@intel.com>
Date: Mon, 5 Mar 2018 12:04:41 -0800
Subject: [PATCH] KVM: VMX: WARN on a MOV CR3 exit w/ unrestricted guest
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
CR3 load/store exiting are always off when unrestricted guest
is enabled. WARN on the associated CR3 VMEXIT to detect code
that would re-introduce CR3 load/store exiting for unrestricted
guest.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Radim KrÄmář <rkrcmar@redhat.com>
---
arch/x86/kvm/vmx.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c517e966b829..6cefd7b3ff7f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6377,6 +6377,7 @@ static int handle_cr(struct kvm_vcpu *vcpu)
err = handle_set_cr0(vcpu, val);
return kvm_complete_insn_gp(vcpu, err);
case 3:
+ WARN_ON_ONCE(enable_unrestricted_guest);
err = kvm_set_cr3(vcpu, val);
return kvm_complete_insn_gp(vcpu, err);
case 4:
@@ -6409,6 +6410,7 @@ static int handle_cr(struct kvm_vcpu *vcpu)
case 1: /*mov from cr*/
switch (cr) {
case 3:
+ WARN_ON_ONCE(enable_unrestricted_guest);
val = kvm_read_cr3(vcpu);
kvm_register_write(vcpu, reg, val);
trace_kvm_cr_read(cr, val);
--
GitLab