[vfio-users] Unbind Vfio Passthrough = general protection fault

[Alex Williamson]

On Tue, Sep 22, 2015 at 11:34 AM, Alex Williamson <
alex.l.williamson at gmail.com> wrote:

> On Tue, Sep 22, 2015 at 9:26 AM, <nahoxou at netcourrier.com> wrote:
>
>> Thanks for withopf deveject good tool who i use as a shutdown task
>> schedule. I have new improvements now on xserver :
>> In a first host boot i get 4/5 vm cycles success.
>> Second host boot same 4/5 result!
>> The 5th attempt fail in both case.
>> Another idea please?
>> Well we're almost there...
>>
>
> What does the xserver have to do with anything?  If I just blacklist
> nouveau and let libvirt bind and unbind devices to vfio-pci around starting
> the VM, I don't have any problems.  Even if you were to attempt to unbind
> the devices from vfio-pci while they're in use by QEMU, the unbind should
> be blocked until QEMU releases the devices.
>

Ok, I think I've seen it once, I'll see if I can make it happen again.
This shouldn't be happening, but... if your goal is only to avoid the oops,
why not just leave the device bound to vfio-pci?  Generally we try to avoid
host graphics drivers since they behave poorly when trying to unbind in-use
devices.
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