[vfio-users] [Qemu-discuss] vfio pass through only works once after reboot

[Abdulla Bubshait]

Hey Jose,

So I just verified that there is a romfile out from asus for the R9 FuryX
that has UEFI support. You can download the rom itself from
https://www.techpowerup.com/vgabios/174070/asus-r9furyx-4096-150712.html
and load it up in qemu instead of the device's own romfile.

Unfortunately it doesn't solve the problem in my case.

I have figured out that the issue I am encountering is that the AMD drivers
refuse to load if the guest is restarted or shut down without rebooting the
host. Without a UEFI rom the GPU never displayed anything to the outputs,
but with the UEFI rom the displays start up before the loading of the
drivers, but when the drivers never load it reverts to generic Microsoft
display drivers so you get a working low res display. In both cases the
problem stems from AMD drivers not loading.

So I feel this might be a new AMD reset issue, where the card isn't
reverting to a state that will allow the driver to load.

If you have any more luck getting the card to work in VFIO please tell me
as I am still stuck in a once per reboot cycle state.

-Abdulla

On Fri, Sep 4, 2015 at 1:44 PM José Ramón Muñoz <koalinux at gmail.com> wrote:

>         Hi,
>
>         No way, is it so? I just noticed that I couldn't use OVMF because
> of the
> same... I just assumed that the card should have support for it... Oh my...
>
>         Thanks for that!
>
>         José.
>
> On Friday 04 September 2015 11:27:24 Alex Williamson wrote:
> > On Fri, Sep 4, 2015 at 11:21 AM, Abdulla Bubshait <darkstego at gmail.com>
> >
> > wrote:
> > > I am running a Radeon R9 Fury X (Fiji) on windows guest (8.1 and 10)
> OVMF
> >
> > ...
> >
> > > Fiji doesn't have any UEFI code in its rom.
> >
> > That's just irresponsible for a vendor to ship a card in 2015 without
> UEFI
> > support...  But you're sort of asking for problems trying to run an OVMF
> > guest w/o UEFI support on the card.
>
>
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