Vega 56 pass through problems

Software & Operating Systems VFIO
1

Hello. I’ve been working on this for 3 days but no success. Hope someone can help.

I’m having trouble getting pass through working for a Windows VM. So far I’ve been able to isolate the card, and the card is using vfio drivers.

When I try to start the VM it just has no output on the secondary gpu. If I enable spice, my VM is working.

1950X
Strix X399
OpenSuse (but tried Ubuntu and Debian also)

I have a feeling it has something to do with the reset bug, but don’t know how to fix it. Many posts on it just give vague information, but I’m missing context.

2

What shows up in your “Device Manager” in the VM for your gpu? Is it getting a code 43? Or does it actually have the driver loaded?

3

Hi. I actually finally figured it out today.

Had to uncheck rom bar. Not sure what that does but it works now.

Also, I don’t have a reset bug. Was it finally fixed?

4

There is a vendor-reset kmod that I think addresses it now.

5

Well. I finally understand the rom bar thing. For anyone having trouble.

At least for me. If usising a UEFI bios you need rom bar activated. If using Seabios, rom bar must be deactivated.