[vfio-users] Boot using second GPU?

[Nicolas Roy-Renaud]

That's something you should fix in the BIOS. The boot GPU is special 
because the motherboard has to use it to display things such as POST 
messages and such, so it's already "tainted" by the time the kernel gets 
a hold of it. I had to put my guest GPU on my motherboard's second PCI 
slot because of that (can't change the boot GPU in the BIOS settings), 
which is pretty unconveinient because it blocks access to most of my 
sata ports.

If there's a way to cleanly pass the boot GPU to a VM, I don't know 
about it. I'd be interested to know too, however.

- Nicolas

On 2016-08-04 13:59, Rokas Kupstys wrote:
> Hey is it possible to make kernel use GPU other than one that is in
> first slot? If so - how?
>
> I have multiple PCIe slots but only first can run at max speed so i
> would like to use it for VGA passthrough. However if i put powerful GPU
> into the first slot - linux boots using that GPU. I would like to make
> kernel use GPU in slot 3. So result should be bios and bootloader
> running on gpu in slot #1, but kernel should use gpu in slot #3. I tried
> binding first gpu to vfio-pci driver hoping kernel would use next
> available gpu. That did not work, i could see one line with systemd
> version in low-res console (normally its high-res). I also tryed
> fbcon=map:1234 (not exactly being sure what im doing) but that yielded
> black screen. Not sure what else i could try.
>