From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH v2] KVM: x86: Pending interrupt may be delivered after INIT Date: Wed, 09 Jul 2014 18:10:28 +0200 Message-ID: <53BD6974.8010306@redhat.com> References: <20140630084707.GJ18167@minantech.com> <1404118982-9429-1-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, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: Nadav Amit Return-path: In-Reply-To: <1404118982-9429-1-git-send-email-namit@cs.technion.ac.il> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org Il 30/06/2014 11:03, Nadav Amit ha scritto: > We encountered a scenario in which after an INIT is delivered, a pending > interrupt is delivered, although it was sent before the INIT. As the SDM > states in section 10.4.7.1, the ISR and the IRR should be cleared after INIT as > KVM does. This also means that pending interrupts should be cleared. This > patch clears upon reset (and INIT) the pending interrupts; and at the same > occassion clears the pending exceptions, since they may cause a similar issue. > > Signed-off-by: Nadav Amit > --- > arch/x86/kvm/x86.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index f32a025..6425a31 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -6835,6 +6835,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu) > atomic_set(&vcpu->arch.nmi_queued, 0); > vcpu->arch.nmi_pending = 0; > vcpu->arch.nmi_injected = false; > + kvm_clear_interrupt_queue(vcpu); > + kvm_clear_exception_queue(vcpu); > > memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); > vcpu->arch.dr6 = DR6_FIXED_1; > Applied to kvm/queue, thanks. Paolo