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

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Date:	Mon, 22 Dec 2014 04:48:57 +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:paolo.bonzini@...il.com] On Behalf Of Paolo
> Bonzini
> Sent: Saturday, December 20, 2014 9:17 PM
> To: Wu, Feng; Paolo Bonzini; 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 20/12/2014 00:48, Wu, Feng wrote:
> > In my understanding, lowest priority interrupts are always delivered to a
> > Single CPU, we need to find the right destination CPU from the cpumask.
> 
> Yes, but which CPU however differs every time the interrupt is
> delivered.  So the emulation here is a bit poor.  For now, please limit
> PI to fixed interrupts.

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!

Thanks,
Feng

> 
> > Actually, we don't support posting broadcast/multicast interrupts, because
> > the interrupt is associated with one Posted-interrupts descriptor, then one
> > vCPU.
> 
> Understood.
> 
> Paolo
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