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

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Message-ID: <549576C7.4030800@redhat.com>
Date:	Sat, 20 Dec 2014 14:16:55 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Yang Zhang <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>
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.

> 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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