From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH] KVM: vmx: DR7 masking on task switch emulation is wrong Date: Mon, 19 May 2014 13:00:14 +0200 Message-ID: <5379E43E.9070502@redhat.com> References: <1400482250-16631-1-git-send-email-namit@cs.technion.ac.il> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: gleb@kernel.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: Nadav Amit Return-path: In-Reply-To: <1400482250-16631-1-git-send-email-namit@cs.technion.ac.il> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org Il 19/05/2014 08:50, Nadav Amit ha scritto: > The DR7 masking which is done on task switch emulation should be in hex format > (clearing the local breakpoints enable bits 0,2,4 and 6). > > Signed-off-by: Nadav Amit > --- > 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 138ceff..286d510 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -5439,7 +5439,7 @@ static int handle_task_switch(struct kvm_vcpu *vcpu) > } > > /* clear all local breakpoint enable flags */ > - vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); > + vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~0x55); > > /* > * TODO: What about debug traps on tss switch? > Thanks, applying to kvm/queue. Paolo