Help with amdgpu Passthrough for LXC

W

walber

New Member
Oct 23, 2023
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Hello everybody.

I have a Ryzen 7 5700u mini pc and I'm trying to passthrough the gpu to an LXC with the frigate. Proxmox 8.0.9

I followed several tutorials, tried several different things, but there was always a point where I couldn't move forward.
https://forum.proxmox.com/threads/how-to-amdgpu-on-proxmox-7.95285/
Some files didn't exist in my installation and had to be created, I don't know to what extent this matters:

/etc/modprobe.d/pve-blacklist.conf:
Code: 
# 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 nouveau
blacklist nvidia
blacklist nvidiafb
blacklist snd_hda_codec_hdmi
blacklist snd_hda_intel
blacklist snd_hda_codec
blacklist snd_hda_core
blacklist radeon
blacklist amdgpu

/etc/modprobe.d/vfio.conf
Code: 
options vfio-pci ids=1002:164c,1002:1637
softdep radeon pre: vfio-pci
softdep amdgpu pre: vfio-pci
softdep snd_hda_intel pre: vfio-pci

/etc/modprobe.d/vfio-pci.conf is empty

/etc/modules
Code: 
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
# Parameters can be specified after the module name.

vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

Code: 
root@pve:~#  find /sys/kernel/iommu_groups/ -type l
/sys/kernel/iommu_groups/17/devices/0000:04:00.6
/sys/kernel/iommu_groups/7/devices/0000:00:14.3
/sys/kernel/iommu_groups/7/devices/0000:00:14.0
/sys/kernel/iommu_groups/15/devices/0000:04:00.3
/sys/kernel/iommu_groups/5/devices/0000:00:08.0
/sys/kernel/iommu_groups/13/devices/0000:04:00.1
/sys/kernel/iommu_groups/3/devices/0000:00:02.1
/sys/kernel/iommu_groups/11/devices/0000:03:00.0
/sys/kernel/iommu_groups/1/devices/0000:00:01.3
/sys/kernel/iommu_groups/8/devices/0000:00:18.3
/sys/kernel/iommu_groups/8/devices/0000:00:18.1
/sys/kernel/iommu_groups/8/devices/0000:00:18.6
/sys/kernel/iommu_groups/8/devices/0000:00:18.4
/sys/kernel/iommu_groups/8/devices/0000:00:18.2
/sys/kernel/iommu_groups/8/devices/0000:00:18.0
/sys/kernel/iommu_groups/8/devices/0000:00:18.7
/sys/kernel/iommu_groups/8/devices/0000:00:18.5
/sys/kernel/iommu_groups/16/devices/0000:04:00.4
/sys/kernel/iommu_groups/6/devices/0000:00:08.1
/sys/kernel/iommu_groups/14/devices/0000:04:00.2
/sys/kernel/iommu_groups/4/devices/0000:00:02.2
/sys/kernel/iommu_groups/12/devices/0000:04:00.0
/sys/kernel/iommu_groups/2/devices/0000:00:02.0
/sys/kernel/iommu_groups/10/devices/0000:02:00.0
/sys/kernel/iommu_groups/0/devices/0000:00:01.0
/sys/kernel/iommu_groups/9/devices/0000:01:00.0
root@pve:~#

Code: 
root@pve:~#  dmesg | grep -e DMAR -e IOMMU -e AMD-Vi
[    0.128404] AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR0, rdevid:160
[    0.128406] AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR1, rdevid:160
[    0.128407] AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR2, rdevid:160
[    0.128408] AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR3, rdevid:160
[    0.128409] AMD-Vi: Using global IVHD EFR:0x206d73ef22254ade, EFR2:0x0
[    0.402035] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    0.402893] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    0.402895] AMD-Vi: Extended features (0x206d73ef22254ade, 0x0): PPR X2APIC NX GT IA GA PC GA_vAPIC
[    0.402904] AMD-Vi: Interrupt remapping enabled
[    0.402906] AMD-Vi: X2APIC enabled
[    0.667845] AMD-Vi: Virtual APIC enabled
[    0.668540] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
root@pve:~#

Code: 
root@pve:~# lspci -nn | grep -e 'AMD/ATI'
04:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Lucienne [1002:164c] (rev c1)
04:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Renoir Radeon High Definition Audio Controller [1002:1637]
root@pve:~#

/etc/default/grub:
Code: 
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=2
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet iommu=pt"
GRUB_CMDLINE_LINUX=""

# If your computer has multiple operating systems installed, then you
# probably want to run os-prober. However, if your computer is a host
# for guest OSes installed via LVM or raw disk devices, running
# os-prober can cause damage to those guest OSes as it mounts
# filesystems to look for things.
#GRUB_DISABLE_OS_PROBER=false

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

As far as I understand, everything is correct up to this point, right?
If so, my problem starts here:
Code: 
root@pve:~# ls -l /dev/dri
ls: cannot access '/dev/dri': No such file or directory
root@pve:~#

What I need to do?

Thanks
 
Last edited:
You want to:
walber said:
passthrough the gpu to an LXC
Click to expand...
but what you actually do with all the stuff you described is:
https://pve.proxmox.com/wiki/PCI(e)_Passthrough
which is for VMs.
With the latter, one wants that the PVE-host does not use the specific device(s) at all; therefore the module-blacklisting and vfio-pci-binding, you did.
But for the former (what you want to do), the PVE-host absolutely needs full access of the specific device(s).
See the problem? ;)

Unfortunately, I have no experience with AMD GPUs/APUs and LXC-passthrough, sorry.
 
  • Like
Reactions: leesteken
Thanks for pointing out the stupid mistake, newbie here.
I was totally lost in the settings, thinking that part of the process for VM and LXC was the same.

As I was unable to revert the settings I made for the GPU, I did a new installation of Proxmox.

Now it's working.
 
  • Like
Reactions: Neobin
walber said:
Thanks for pointing out the stupid mistake, newbie here.
I was totally lost in the settings, thinking that part of the process for VM and LXC was the same.

As I was unable to revert the settings I made for the GPU, I did a new installation of Proxmox.

Now it's working.
Click to expand...
You got it working? what exactly did you do? i just picked up a 5800U and want to pass it thru to an LXC as well.
 
FluxSine said:
You got it working? what exactly did you do? i just picked up a 5800U and want to pass it thru to an LXC as well.
Click to expand...

I just now saw your message.
Go to /etc/pve/nodes/pve/lxc
Open the file for your LXC and add the lines:



Code: 
lxc.cgroup2.devices.allow: c 226:0 rwm
lxc.cgroup2.devices.allow: c 226:128 rwm
lxc.cgroup2.devices.allow: c 29:0 rwm
lxc.mount.entry: /dev/fb0 dev/fb0 none bind,optional,create=file
lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir
lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file

If you have proxmox updated you can do it now through the UI:
https://github.com/tteck/Proxmox/discussions/2850

I haven't tested it this way yet
 
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