AMD Passthrough Fix

Created based on the information found in these sources:

• gnif/vendor-reset#46
• https://www.nicksherlock.com/2020/11/working-around-the-amd-gpu-reset-bug-on-proxmox/
• https://github.com/gnif/vendor-reset
• https://pve.proxmox.com/wiki/PCI_Passthrough
• https://us.informatiweb.net/tutorials/it/bios/enable-iommu-or-vt-d-in-your-bios.html

Proxmox notes:

This script was built with the intention of being used on Proxmox nodes, it will probably work other places as well however. Special things to note about using Proxmox:

• You'll need to enable the no-subscription repository to get the headers.
  • You can do this in the Proxmox gui quite easily: Select the node > Updates > Repositories > Add (Click OK on prompt) > Change drop-down to No-subscription > Click Add
• To install the header files: apt install pve-headers
  • Reboot after installing them!

Before you run:

• Make sure you have the kernel headers installed (as well as git and dkms)! The script will error out otherwise.
• Run script as root
• Note: This script is built for systems running systemd, because that's what Proxmox uses. In the future I might generalize it.

IOMMU Interrupt Remapping

My test computers support interrupt rempping, therefor I cannot test the workaround for other systems. Check this link to find out your situation.

The script currently doesn't automatically add the kernel parameters to your grub config. This page on the arch wiki tells you what to do. In short:

• Intel CPU: intel_iommu=on iommu=pt
• AMD CPU: iommu=pt

Troubleshooting

My VM is crashing

According to this you may need to do this on your host:

echo "options kvm ignore_msrs=1 report_ignored_msrs=0" > /etc/modprobe.d/kvm.conf

Please read the link real quick to make sure this is actually what you need :)

VM Boots but I have a black screen

I solved this by setting the gpu to not be for display.