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SubjectRE: [PATCH v3 1/4] KVM: Recover IRTE to remapped mode if the interrupt is not single-destination
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> -----Original Message-----
> From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo
> Bonzini
> Sent: Monday, January 25, 2016 8:23 PM
> To: Radim Krcmár <rkrcmar@redhat.com>; Wu, Feng <feng.wu@intel.com>
> Cc: linux-kernel@vger.kernel.org; kvm@vger.kernel.org
> Subject: Re: [PATCH v3 1/4] KVM: Recover IRTE to remapped mode if the
> interrupt is not single-destination
>
>
>
> On 22/01/2016 14:05, Radim Krcmár wrote:
> > > This is a good question. I also thought about this before, but after
> > > thinking it a bit more, seems we don't need to do this.
> > > If we don't do this, the in-flight interrupts will continue to be
> > > delivered in PI mode while we are changing it to remapped
> > > mode in IRTE. Even if we do this, the in-flight interrupts are
> > > also delivered in PI mode before setting 'SN' anyway, so seems
> > > we really don't need this, what is your opinion?
> > I'd remove it.
>
> It may be necessary because IRTE writes (128 bits) are not atomic.

IRTE is updated atomically, I added the patch to support this. Please
refer to 344cb4e0b6f3a0dbef0643eacb4946338eb228c0.

Thanks,
Feng

>
> If so, no need to send v5, I'll add it back.
>
> Paolo
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