[vfio-users] GPU passthrough: device does not support requested feature x-vga

[Артем Семенов]

Hello!

I try to passthrough GPU to the virtual machine (qemu). I've tried 
different variants:

-device vfio-pci,host=02:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on

or

-device vfio-pci,host=02:00.0,x-vga=on

and other but in any case I get error:

vfio 0000:02:00.0: failed getting region info for VGA region index 8: 
Invalid argument
device does not support requested feature x-vga

dmesg contains:

[  844.599821] vfio_ecap_init: 0000:02:00.0 hiding ecap 0x1e at 0x258
[  844.599860] vfio_ecap_init: 0000:02:00.0 hiding ecap 0x19 at 0x900

If I remove x-vga=on option then qemu works but there is no signal from 
GPU (black screen).

It looks like http://vfio.blogspot.com/2014/08/vfiovga-faq.html

"Question 3:

I have Intel host graphics, when I start the VM I don't get any output 
on the assigned VGA monitor... "

I've tried to use 2 versions of the kernel: 4.19 and 5.4 - no difference.

Moterboard: ASUS PRIME H370-A.
GPU: ASUS Turbo GeForce RTX 2060 Super.

What could be the cause of this problem?

Thanks!

-- 
With best regards,
  Artem Semenov               mailto:artem.semenov at jarillolabs.com