Can this work inside a VM (under proxmox)

[erikboberg]

Hi!
I tried to get P2P working on my ubuntu VM with two RTX 3090:s using PCIe passthrough. I enabled nested virtualization and IOMMU on the VM. Installed the latest drivers and then the open-gpu-kernel-modules with the install script. It finishes fine it seems, but the nvidia-smi topo -p2p r command just shows:

 	GPU0	GPU1	GPU2
 GPU0	X	NS	NS
 GPU1	NS	X	NS
 GPU2	NS	NS	X

Legend:

  X    = Self
  OK   = Status Ok
  CNS  = Chipset not supported
  GNS  = GPU not supported
  TNS  = Topology not supported
  NS   = Not supported
  U    = Unknown

GPU0 is a RTX 4090, and I am not expecting that to have P2P with the other cards, just GPU1 and GPU2 which are both RTX 3090s.

Is there a way to make this work in a VM? How do I debug this further?

Thank you so much in advance!
Erik