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SubjectRE: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for VT-d PI
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> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> Sent: Monday, December 22, 2014 5:28 PM
> To: Wu, Feng; Zhang, Yang Z; Thomas Gleixner; Ingo Molnar; H. Peter Anvin;
> x86@kernel.org; Gleb Natapov; dwmw2@infradead.org; joro@8bytes.org;
> Alex Williamson; Jiang Liu
> Cc: iommu@lists.linux-foundation.org; linux-kernel@vger.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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