[vfio-users] Guest does not boot OS with GPU passed through, stuck at TianoCore boot splash
stefan.seil at gmx.net
Tue Apr 12 18:56:45 UTC 2016
Oh, interesting. This seems to be what I am experiencing now (see my
answer to Laszlo). When I am now using additional emulated graphics, I
can see the boot output (on the emulated display) until it stops at a
certain point .
On Mon, Apr 11, 2016 at 10:47 PM, Alex Williamson wrote:
> On Mon, Apr 11, 2016 at 1:47 PM, Stefan Seil <stefan.seil at gmx.net
> <mailto: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,
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