linux-kernel - Re: [v3 24/26] KVM: Update Posted-Interrupts Descriptor when vCPU is blocked

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Message-ID: <5491B8DD.5020000@redhat.com>
Date:	Wed, 17 Dec 2014 18:09:49 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>, Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"joro@...tes.org" <joro@...tes.org>,
	Alex Williamson <alex.williamson@...hat.com>
CC:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	Eric Auger <eric.auger@...aro.org>
Subject: Re: [v3 24/26] KVM: Update Posted-Interrupts Descriptor when vCPU
 is blocked



On 12/12/2014 16:14, Feng Wu wrote:
> This patch updates the Posted-Interrupts Descriptor when vCPU
> is blocked.
> 
> pre-block:
> - Add the vCPU to the blocked per-CPU list
> - Clear 'SN'

Should SN be already clear (and NV set to POSTED_INTR_VECTOR)?  Can it
happen that you go from sched-out to blocked without doing a sched-in first?

In fact, if this is possible, what happens if vcpu->preempted &&
vcpu->blocked?

> - Set 'NV' to POSTED_INTR_WAKEUP_VECTOR
> 
> post-block:
> - Remove the vCPU from the per-CPU list

Paolo

> Signed-off-by: Feng Wu <feng.wu@...el.com>
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