Re: [Xen-devel] panic("queue invalidate wait descriptor was not executed\n")

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

> -----Original Message-----
> From: Zytaruk, Kelly [mailto:Kelly.Zytaruk@xxxxxxx]
> Sent: Thursday, May 12, 2016 10:21 PM
> To: Jan Beulich <JBeulich@xxxxxxxx>
> Cc: Wu, Feng <feng.wu@xxxxxxxxx>; Tian, Kevin <kevin.tian@xxxxxxxxx>; xen-
> devel@xxxxxxxxxxxxx
> Subject: RE: [Xen-devel] panic("queue invalidate wait descriptor was not
> executed\n")
> 
> 
> 
> > -----Original Message-----
> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > Sent: Thursday, May 12, 2016 9:51 AM
> > To: Zytaruk, Kelly
> > Cc: Feng Wu; Kevin Tian; xen-devel@xxxxxxxxxxxxx
> > Subject: RE: [Xen-devel] panic("queue invalidate wait descriptor was not
> > executed\n")
> >
> > >>> On 12.05.16 at 14:36, <Kelly.Zytaruk@xxxxxxx> wrote:
> > >> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > >> Sent: Thursday, May 12, 2016 5:49 AM
> > >> >>> On 11.05.16 at 15:51, <Kelly.Zytaruk@xxxxxxx> wrote:
> > >> > During Xen boot I am seeing the panic in the subject line from
> > >> > .../xen/drivers/passthrough/vgt/qinval.c
> > >>
> > >> And this is with current staging, or some much older version of Xen?
> > >> (ISTR some issue with the invalidation request getting sent to the
> > >> wrong IOMMU, leading to a timeout.)
> > >
> > > No this is not current Xen, it is with 4.2.
> > >
> > > Can you tell me more about the invalidation request getting sent to
> > > the wrong IOMMU problem and approximately when it was fixed?  If you
> > > could identify the patch I could back port it into my copy of Xen for 
> > > testing.
> >
> > Note that 4.2.5 has said change, and also note that you could have done
> exactly
> > what I have done now - go through the list of commits altering files in the 
> > vtd/
> > subtree.
> 
> Unfortunately GIT is not my strong suit :( I am still learning to navigate 
> with it. I
> guess part of my problem with GIT is that I don't yet know what I don't know.
> 
> >This is what I've been remembering:
> >
> http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=84c340ba4c3eb9927
> > 8b6ba885616bb183b88ad67
> 
> The comment on this link describes exactly what I am experiencing.
> Thanks so much.

Thanks Jan for providing the information above. Kelly, if you still met the same
issue after applying the patches, let us know, maybe I can consult some hardware
expert internally.

Thanks,
Feng

> 
> >
> > Jan


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