linux-kernel - Re: [PATCH v2] KVM: x86: Pending interrupt may be delivered after INIT

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Message-ID: <53BD6974.8010306@redhat.com>
Date:	Wed, 09 Jul 2014 18:10:28 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Nadav Amit <namit@...technion.ac.il>
CC:	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KVM: x86: Pending interrupt may be delivered after
 INIT

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 <namit@...technion.ac.il>
> ---
>  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
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