Dual GPUS in a Single VM

[PeterCTucker]

Hi Guys,
I'm trying to get two 3060s to work in a single Windows 10 VM. My setup works fine with a single 3060. However, when I add an additional 3060, it just hangs and never loads into Windows 10, just a black screen. I can't seem to find anything helpful in the logs either. Attached is my diagnostics. Any help is appreciated. Thanks!

gibson-diagnostics-20230614-1647.zip

[SimonF]

Try adding this to the xml.

 

<qemu:commandline>
  <qemu:arg value='-fw_cfg'/>
  <qemu:arg value='opt/ovmf/X-PciMmio64Mb,string=65536'/>
</qemu:commandline>

 

[PeterCTucker]

I tried that. No dice. Do you know if my VM machine setting has to be iffo or q35? I also added this line to the top:
 

xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'

 

Does not seem to work. I'm also wondering if these steps are necessary:

1. Boot Unraid in legacy mode

2. Bind both, either, or neither gpu at boot with vfio

 

I've combed Unraid forums, unraid discord, and the unraid subreddit, and every person that ran into this problem looks to not be able to get a clear answer on the steps to solve this problem leaving the issue unsolvable.

[Kodon]

Maybe your GPU doesn't start up?

I'd attach a physical monitor and see what it does.

With my 4090 and 4060 I need a (dummy) load so that they fire up.