linux-kernel - Re: [v3 13/26] KVM: Define a new interface kvm_find_dest

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Date:	Mon, 22 Dec 2014 22:13:18 +0800
From:	Yong Wang <yong.y.wang@...ux.intel.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	"Wu, Feng" <feng.wu@...el.com>,
	"Zhang, Yang Z" <yang.z.zhang@...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>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"joro@...tes.org" <joro@...tes.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@...lic.gmane.org>,
	"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 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
 VT-d PI

On Mon, Dec 22, 2014 at 12:23:36PM +0100, Paolo Bonzini wrote:
> 
> 
> On 22/12/2014 12:17, Wu, Feng wrote:
> >> Yes, and those need not be accelerated.  But what if you set
> >> affinity to a single CPU?
> >
> > How do I set affinity to a single CPU if guest configure a lowest
> > priority interrupt? Thanks a lot!
> 
> I mean if the guest (via irqbalance and /proc/irq/) configures affinity
> to a single vCPU.  In that case, you can use PI.
> 

The problem is we still need to support PI with lowest priority delivery mode
even if guest does not configure irq affinity via /proc/irq/. Don't we?

Thanks
-Yong

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