Access Nvidia GPU on host from unprivileged LXC

lxc-nv-gpu-unprivileged.cfg

# NVIDIA GPU passthrough
# These needs to be put before including common.conf ¯\_(ツ)_/¯
lxc.cgroup2.devices.allow = c 195:* rwm
lxc.cgroup2.devices.allow = c 509:* rwm
lxc.cgroup2.devices.allow = c 236:* rwm

lxc.mount.entry = /dev/nvidia0 dev/nvidia0 none bind,optional,create=file
# in case you have another GPU
lxc.mount.entry = /dev/nvidia1 dev/nvidia1 none bind,optional,create=file
lxc.mount.entry = /dev/nvidiactl dev/nvidiactl none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-uvm dev/nvidia-uvm none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-uvm-tools dev/nvidia-uvm-tools none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-caps dev/nvidia-caps none bind,optional,create=dir

# Distribution configuration
lxc.include = /usr/share/lxc/config/common.conf
lxc.include = /usr/share/lxc/config/userns.conf
lxc.arch = linux64

# Container specific configuration
lxc.idmap = u 0 100000 65536
lxc.idmap = g 0 100000 65536
lxc.rootfs.path = dir:/var/lib/lxc/ubuntu-noble/rootfs
lxc.uts.name = ubuntu-noble

# Network configuration
lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 10:66:6a:2a:20:0c

Install the driver in lxc by running .run installer file with --no-kernel-modules option. Recommended to match the host driver version.