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

[Nick Sukharev]

I have to (cautiously) say that removing audio passthrough seems to help
with this issue. I already had twice the number of restarts it usually
takes to freeze it and it is still going strong. I always had it bound to
vfio-pci and now I just removed the audio part from the shell script I use
to start my VMs.

On Thu, Feb 18, 2016 at 6:25 AM, Alex Williamson <alex.williamson at redhat.com
> wrote:

> On Thu, 18 Feb 2016 06:00:59 -0800
> Nick Sukharev <nicksukharev at gmail.com> wrote:
>
> > 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)
>
> In the case of the GPU audio function, you can't simply ignore it
> because it's part of the same IOMMU group as the GPU itself.  It needs
> to be bound to vfio-pci or pci-stub or else you can't use the group
> with the GPU at all.  You don't necessarily need to assign it to the
> guest though.  The problem suspected here would occur when the devices
> are bound back to the host drivers.  You can easily just not do that if
> you're using a script, that's effectively what the libvirt instructions
> do.  If you really just don't want to deal with a device at all, you
> can do a software hot unplug (echo 1> /sys/bus/pci/devices/.../remove).
>
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