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

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Message-ID: <E959C4978C3B6342920538CF579893F002310D51@SHSMSX104.ccr.corp.intel.com>
Date:	Mon, 22 Dec 2014 11:04:25 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.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>
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>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
 VT-d PI



> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@...hat.com]
> Sent: Monday, December 22, 2014 5:28 PM
> To: Wu, Feng; Zhang, Yang Z; Thomas Gleixner; Ingo Molnar; H. Peter Anvin;
> x86@...nel.org; Gleb Natapov; dwmw2@...radead.org; joro@...tes.org;
> Alex Williamson; Jiang Liu
> Cc: iommu@...ts.linux-foundation.org; linux-kernel@...r.kernel.org; KVM list;
> Eric Auger
> Subject: Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
> VT-d PI
> 
> 
> 
> On 22/12/2014 05:48, Wu, Feng wrote:
> > Do you mean we don't support Lowest priority interrupts? As I mentioned
> before,
> > Lowest priority interrupts is widely used in Linux, so I think supporting lowest
> priority
> > interrupts is very important for Linux guest OS. Do you have any
> ideas/suggestions about
> > how to support Lowest priority interrupts for PI? Thanks a lot!
> 
> Can you support them only if the destination is a single CPU?

Sorry, I am not quite understand this. I still don't understand the "single CPU" here.
Lowest priority interrupts always have a cpumask which contains multiple CPU.

Thanks,
Feng

> 
> Paolo
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