Re: [Xen-devel] [BUG] Xen panic with VT-d PI

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: Dario Faggioli [mailto:dario.faggioli@xxxxxxxxxx]
> Sent: Friday, May 27, 2016 12:11 AM
> To: Wu, Feng <feng.wu@xxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>; Hao, Xudong
> <xudong.hao@xxxxxxxxx>
> Subject: Re: [Xen-devel] [BUG] Xen panic with VT-d PI
> 
> On Thu, 2016-05-26 at 13:03 +0000, Wu, Feng wrote:
> > > On Thu, May 26, 2016 at 01:56:28AM +0000, Wu, Feng wrote:
> > > >
> > > > The patch fixing this issue has already been sent to upstream.
> > > >
> > > > " [PATCH 0/3] VMX: Properly handle pi descriptor and per-cpu
> > > > blocking list "
> > > >
> > > > v2 will be sent out soon.
> > > >
> > > I just went through that thread. There are some open questions.
> > > Also Jan
> > > requested that you explore other possible options.
> > >
> > > My current plan is to not block the release for this -- we're very
> > > close
> > > to the anticipated release date, and posted-interrupt is either
> > > technical preview or experimental, so bugs there are expected.
> > >
> > > This issue will be listed as a known issue for PI. And you can
> > > continue
> > > to develop a fix for it. Your fix will be integrated with next
> > > version
> > > of Xen. Then you can request for backport to 4.7 if you want to.
> > >
> > > What do you think about this plan?
> > I am going to send out the next version of this series, let's see how
> > it is going on. But basically, I am fine with your release plan.
> >
> This does not have anything to do with Wei's plan (with which I also
> agree), but are you sure that the bug being reported here is related to
> and would be fixed by the patch you're mentioning?

Yes, this bug is caused by device hotplug, which is fixed in this patch
set.

> 
> Have you also seen it, and is that what led to the patch? If yes,
> please, add a bit more information (including excerpts of, or insights
> about the splat) in the patch changelog.

The bug leads to this patch, and I also saw issues beyond it, such as,
the domain destroy, pCPU hotplug cases. Sure, I will add some info
about it in the next version.

Thanks,
Feng

> 
> Regards,
> Dario
> --
> <<This happens because I choose it to happen!>> (Raistlin Majere)
> -----------------------------------------------------------------
> Dario Faggioli, Ph.D, http://about.me/dario.faggioli
> Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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