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

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

> -----Original Message-----
> From: Wu, Feng [mailto:feng.wu@xxxxxxxxx]
> Sent: Friday, May 13, 2016 3:11 AM
> To: Zytaruk, Kelly; Jan Beulich
> Cc: Tian, Kevin; xen-devel@xxxxxxxxxxxxx; Wu, Feng
> Subject: RE: [Xen-devel] panic("queue invalidate wait descriptor was not
> executed\n")
> 
> 
> 
> > -----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=84c340ba4c3eb9
> > 927
> > > 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.

Turns out this was exactly my problem.  The description matched my symptoms and 
when I applied the patch the problem has gone away.
Thanks,
Kelly

> 
> Thanks,
> Feng
> 
> >
> > >
> > > Jan


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