[vfio-users] Win 10 VM often freezes Linux when shutting down

[Nick Sukharev]

So, if I am not using virsh, would it be sufficient to just remove audio
devices from my shell script that starts qemu? I am also not using them and
just thought I need to pass them to make AMD drivers happy. I am happy with
virtual audio provided by QEMU (and have multiple cards so wiring their
audio output to some speakers would be a project just by itself)

On Wed, Feb 17, 2016 at 2:30 PM, Alex Williamson <alex.williamson at redhat.com
> wrote:

> On Wed, 17 Feb 2016 22:41:53 +0100
> Jens Zimmermann <zimmermannjens888 at gmail.com> wrote:
>
> > Hello guys!
> >
> > I have a Windows 10 VM with GPU passsthrough working for around 2 months
> > now and while there were no problems in the very beginning as far as I
> can
> > tell, soon after the VM started to freeze my Linux sometimes after I shut
> > it down.
> > The strange thing is that it does not happen every time. It seems like it
> > usually happens when the VM was running for quite some time like an hour
> or
> > two.
> > I thought it may be the Windows shut down which is by default some kind
> of
> > hibernate, so I shut down Windows by using the command "shutdown /s /t0",
> > but that did not help. I also tried force stopping the VM, that led to a
> > freeze as well.
> >
> > I presume the error is caused by Linux not being able to integrate the
> > virtual/passed through hardware into the system again somehow. Perhaps
> it's
> > the memory since the freezes usually happen when the VM was running for
> > some time, but this is just a wild guess, I am no linux expert at all.
> >
> > This is journalctl of the most recent freeze, VM was started at 20:13 and
> > shut down at 21:09, followed by a freeze: http://pastebin.com/mwQsFsKB
> > In comparison this time it did not freeze, start at 21:33, finishes at
> > 21:55: http://pastebin.com/YGPnVPBD
> >
> > My setup: i7-5820k, ASRock x99 Extreme 4, 16GB RAM, nvidia 210 & 750 Ti,
> > two monitors, mice and keyboards, Manjaro 15.12 with kernel 4.1, qemu
> > 2.4.1-2, libvirt 1.3.1-2, virt-manager 1.3.2-2
> > qemu xml: http://pastebin.com/WPupqDEv
> >
> > I would be glad to provide you more information, just tell me what you
> want
> > and how I can get it.
> >
> > I really appreciate any suggestion, I am out of ideas now.
>
> I'd be suspicious of any devices that you're assigning that gets
> re-bound to host drivers when the VM is shutdown.  I see from the XML
> that you're not only assigning the GPU audio, but 00:1b.0 on the system
> as well, which I'd guess is the onboard audio.  You can bind all the
> assigned devices with virsh nodedev-detach and then set managed='no' in
> the xml to make sure they don't get re-attached to host drivers.
>
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