[vfio-users] Host can't wake from suspend after running a passthrough VM

Alex Williamson alex.williamson at redhat.com
Fri Oct 21 23:58:18 UTC 2016

On Thu, 20 Oct 2016 20:40:24 -0500
Ryan A Young <rayoung at utexas.edu> wrote:

> After I start and then shutdown my passthrough VM and then suspend the
> host, it won't wake from suspend anymore. As in, once in S3, pressing
> the power button simply has no effect. I have to press the reset
> button (and sometimes that doesn't work either) and restart the
> machine. Suspend works correctly if I never start the VM.
> Has anyone seen this issue before?
> Hardware: i5-4690, ASRock H97, GTX 1060.
> Software: Fedora 24, kernel 4.7.7, qemu 2.6.2, GTX 1060 video and
> audio taken by vfio-pci, OVMF VM with Windows 10 managed by libvirt.

Try a v4.8 kernel, I was doing some testing on a Fedora v4.7 system and
seeing a number of strange things after running a VM with device
assignment.  Disabling KVM resolved the problem, but is clearly not a
useful workaround.  I wasn't able to reproduce on v4.8, which makes me
think KVM in v4.7 might have some issues.

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