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

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Message-ID: <54AFF128.1080603@redhat.com>
Date:	Fri, 09 Jan 2015 16:18:00 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	Feng Wu <feng.wu@...el.com>, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, gleb@...nel.org,
	dwmw2@...radead.org, joro@...tes.org, alex.williamson@...hat.com,
	jiang.liu@...ux.intel.com, eric.auger@...aro.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	kvm@...r.kernel.org
Subject: Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
 VT-d PI



On 09/01/2015 16:12, Radim Krčmář wrote:
> > The chipset doesn't support it. :(
> 
> I meant that we need to recompute PI entries for lowest priority
> interrupts every time guest's TPR changes.
> 
> Luckily, Linux doesn't use TPR, but other OS might be a reason to drop
> lowest priority from PI optimizations.  (Or make it more complicated.)

Doing vector hashing is a possibility as well.  I would like to know
what existing chipsets do in practice, then we can mimic it.

Paolo
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