IOMMU and iGPU to Passthrough PCI into VM/CT

Source: hiepchau.net

1. Edit the grub configuration

nano /etc/default/grub

2. Active IOMMU and iGPU

# GRUB_CMDLINE_LINUX_DEFAULT="quiet" <- replace this line
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on i915.enable_gvt=1 iommu=pt pcie_acs_override=downstream,multifunction video=efifb:off video=vesa:off vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu"

3. Update grub

update-grub

4. Edit modules file

nano /etc/modules

# Modules required for PCI passthrough
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

5. Update the configuration changes

update-initramfs -u -k all

6. Reboot

Passthrough iGPU into LXC and activate Plex HW Transcode

1. Verify that iGPU is detected in the Proxmox Server

lspci -nnv | grep VGA

2. Check IDs

ls -l /dev/dri

card0

• major: 226
• minor: 0

renderD128

• major: 226
• minor: 128

3. Open the LXC configuration and add the below to the config

nano /etc/pve/lxc/<ID>.conf

lxc.cgroup2.devices.allow: c 226:0 rwm
lxc.cgroup2.devices.allow: c 226:128 rwm
lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file 0, 0
lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir

4. Restart and verify

Restart the container. Once it reboots login and check to see if it is working. I like to do this by installing intel-gpu-tools and running intel_gpu_top