VM iGPU Passthrough

Setting Up

This guide seems to work for Strix Halo:
https://github.com/isc30/ryzen-gpu-passthrough-proxmox

This is mostly tied to Proxmox, but should still be applicable to regular systems with QEMU installed.

Configuration

# /etc/kernel/cmdline
... iommu=pt initcall_blacklist=sysfb_init

# /etc/modules
vfio
vfio_iommu_type1
vfio_pci

# /etc/modprobe.d/blacklist.conf
blacklist radeon
blacklist amdgpu
blacklist snd_hda_intel

# /etc/modprobe.d/vfio.conf
options vfio-pci ids=1002:1586,1002:1640 disable_vga=1

# vm.conf for QEMU
machine: pc-q35-9.2+pve1,viommu=virtio
cpu: host
# don't forget to replace the IDs if needed
hostpci0: 0000:c6:00.0,pcie=1,romfile=vbios_8060s.bin,x-vga=1
hostpci1: 0000:c6:00.1,pcie=1,romfile=AMDGopDriver.rom

Proxmox VM:
8060s GPU Passthrough in Proxmox

Notes

hardware IDs are 1002:1586 (iGPU) and 1002:1640 (audio)
Windows works fine, but I haven't managed to do it with a Linux VM, amdgpu driver crashes
the 'reset bug' is here, I found no way to avoid it, so you can passthrough the iGPU only once per boot of the host
if your VM crashes during GPU driver install, switch the CPU type to something generic (x86-64-v4 for example seems to work fine), install the driver, then return it back to host
if you see unknown PCI device (1af4:1057) in your Device Manager, install viomem driver manually from virtio drivers ISO
set the fixed VRAM amount in the BIOS and never change it on the OS level, otherwise expect major slowdowns and crashes
this issue might be worth looking into

Files

(taken from EVO-X2, BIOS version 1.04)