From 332518706195007f9fbafa69652aa5b3cf72df24 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Thu, 13 Apr 2017 18:39:18 +0200 Subject: [PATCH] KVM: nVMX: fix AD condition when handling EPT violation MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit I have introduced this bug when applying and simplifying Paolo's patch as we agreed on the list. The original was "x &= ~y; if (z) x |= y;". Here is the story of a bad workflow: A maintainer was already testing with the intended change, but it was applied only to a testing repo on a different machine. When the time to push tested patches to kvm/next came, he realized that this change was missing and quickly added it to the maintenance repo, didn't test again (because the change is trivial, right), and pushed the world to fire. Fixes: ae1e2d1082ae ("kvm: nVMX: support EPT accessed/dirty bits") Signed-off-by: Radim Krčmář --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index cfdb0d9..837f6dd 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6221,7 +6221,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu) * page table accesses are reads or writes. */ u64 eptp = nested_ept_get_cr3(vcpu); - if (eptp & VMX_EPT_AD_ENABLE_BIT) + if (!(eptp & VMX_EPT_AD_ENABLE_BIT)) exit_qualification &= ~EPT_VIOLATION_ACC_WRITE; } -- 2.7.4