[vfio-users] Guest does not boot OS with GPU passed through, stuck at TianoCore boot splash

Jayme Howard g.prime at gmail.com
Mon Apr 11 20:41:06 UTC 2016

Possibly more appropriate to the spirit of another thread, but for what
it's worth Alex, I'm using both emulated graphics and an NVIDIA GTX 970
together, successfully.  Not going to try to derail this further, just felt
that it's worth noting for anybody who catches this in the archive.

On Mon, Apr 11, 2016 at 3:36 PM, Alex Williamson <
alex.l.williamson at gmail.com> wrote:

> On Mon, Apr 11, 2016 at 1:47 PM, Stefan Seil <stefan.seil at gmx.net> wrote:
>> I am already running on 4.5, so that should be fine. The OVMF version I
>> was using was a couple of months old, so I just got a newer one from
>> https://www.kraxel.org/repos/jenkins/edk2/ and pointed the respective
>> XML tag to the newer OVMF_CODE-pure-efi.fd, but that did not change
>> anything.
>> I guess your card is from a different manufacturer then and thus has a
>> different ROM? Because if I try to use the standard ROM of my card (as in
>> not explicitly passing any rom file to the VM at all), I don't get any
>> output on the monitor connected to the card at all.
>> What exactly do you mean with "AMD cards also have the option of running
>> as secondary graphics devices in many cases"?
> You have two options when you assign a GPU to a VM, you can do it in
> addition to the emulated graphics (cirrus/VGA/QXL) or instead of the
> emulated graphics.  You indicated following my blog, so I assume you
> removed the emulated graphics when you added the assigned GPU.  This is
> necessary for NVIDIA GeForce, but many users have found that AMD cards also
> work when added to the VM configuration with the emulated graphics.  No ROM
> is necessary on the assigned GPU in this case.  The emulated graphics will
> show the BIOS and early boot output, then the assigned graphics can be
> enabled.  This mode doesn't actually require OVMF, it works with SeaBIOS
> too.
> Anyway, I'm curious to the answers to Laszlo's questions.  I've also seen
> hangs at the TianoCore splash with certain USB host controllers assigned.
> Thanks,
> Alex
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