iGPU Passthrough Proxmox

Edit the grump configuration file

nano /etc/default/grub

change GRUB_CMDLINE_LINUX_DEFAULT to

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction initcall_blacklist=sysfb_init video=simplefb:off video=vesafb:off video=efifb:off video=vesa:off disable_vga=1 vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu,snd_hda_intel,snd_hda_codec_hdmi,i915"

Then update GRUB

update-grub

Next we need to add vfio modules to allow PCI passthrough.

Edit the /etc/modules file.

nano /etc/modules

Add the following line to the end of the file:

# Modules required for PCI passthrough
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

Update changes

update-initramfs -u -k all

Reboot Proxmox

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Verify that IOMMU is enabled

dmesg | grep -e DMAR -e IOMMU

DMAR: IOMMU enabled

Go to the VM on Proxmox and under the Hardware section add a PCI device. Select the iGPU, All Functions, Rom-Bar and click add.

After starting the VM run sudo lspci -nnv | grep VGA and it should output the iGPU.

Next run cd /dev/dri && ls -la and verify that renderD128 is present.