Notes to make double GPU Passtrough works (iGPU+Linux & Radeon+win11)

HariSeldon

New Member
Nov 6, 2023
11
0
1
Hi everyone,
I've spent quite a lot of time to configure on my server a double GPU passthrough.
I'm sharing it because "maybe" can be anyway helpful to some proxmox newbie like me :)

Please keep in mind that these are only "personal notes" that applies to my machine and they are wrote in this way.
Obviously they are also pretty straight-forwarded and I hope they could be useful somehow.

Code:
0) System configuration: Intel Core i5 12400 (Alder Lake), Radeon 6400 low profile (RDNA2), 32GB DDR4, MSI PRO B760M D4.
System has been configured with 2 VM with 2 GPU passtrough at the same time, fully working: Win11+radeon6400, Lubuntu23.10+UHD730 (iGPU)

1) For none of the both videocard is needed to extract the bios ( romfile ) (UHD730 e Radeon 6400)

2) To make the passthrough of the radeon on windows WORK correctly it is MANDATORY to disable the RESIZABLE-BAR from host bios ( hardware machine ). Many tests has been done on this: with the resizable bar activated, the win11 vm goes at low resolution and radeon driver doesn't load.

3) Double check pci ids with : lspci -nnk
(look at "pci_output.txt").

4) Configure the following files in the following way:

#/etc/defaults/grub
#
#Testing full passthough with UEFI, LUBUNTU and i440fx: fully working!
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction initcall_blacklist=sysfb_init"

#/etc/moprobe.d/vfio.conf
#
options vfio-pci ids=8086:4682,8086:7a50,8086:7a60,8086:7a62,1002:743f,1002:1478,1002:1479,1002:ab28,15b7:5002 disable_vga=1
options vfio_iommu_type1 allow_unsafe_interrupts=1
options kvm ignore_msrs=1

#etc/modprobe.d/pve-blacklist.conf
#
# This file contains a list of modules which are not supported by Proxmox VE

# nvidiafb see bugreport https://bugzilla.proxmox.com/show_bug.cgi?id=701
blacklist nvidiafb
blacklist radeon
blacklist amdgpu
blacklist nouveau
blacklist nvidia
blacklist nvidia-gpu
blacklist snd_hda_intel
blacklist snd_hda_codec_hdmi
blacklist snd_sof_pci_intel_tgl
blacklist snd_soc_avs
blacklist i915
blacklist xhci_hcd
blacklist mei_me
blacklist xhci_pci
blacklist ahci

#/etc/modules
#
# Modules required for PCI passthrough
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

5) At the end update proxmox config with:
update-initramfs -k all -u && update-grub

6) Please refer to the vm configuration ("proxmox_vm_cfg_linux.txt" & "proxmox_vm_cfg_win11.txt" ) extensively tested with gpu and different devices passthrough.
One thing to note is that a working GPU passthrough with also HDMI audio is needed i440fx machine type.



############ OTHER INFO NOT USED ######################

#read igpu rom - doesn't work with Intel 730, worked with Intel uhd630
root@mygalaxy-orionis:/sys/bus/pci/devices/0000:00:02.0# echo 1 > rom
root@mygalaxy-orionis:/sys/bus/pci/devices/0000:00:02.0# cat rom > /usr/share/kvm/igpu_uhd730.bin
root@mygalaxy-orionis:/sys/bus/pci/devices/0000:00:02.0# echo 0 > rom

#romfile add in this way : [...],romfile=igpu_uhd630.bin
hostpci0: 00:02,x-vga=on,romfile=igpu_uhd630.bin
 

Attachments

  • proxmox_vm_cfg_win11.txt
    681 bytes · Views: 16
  • proxmox_vm_cfg_linux.txt
    626 bytes · Views: 9
  • lspci_output.txt
    5.9 KB · Views: 11
Last edited:

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!