PVE 7.0.x and LXC USB passthrough issue

[YAGA]

Dear PVE users,

Previously I was running smoothly a LXC container with USB passthrough on PVE 6.4.x.

After an upgrade from PVE 6.4.x. to PVE 7.0.x this container cannot access anymore to the USB device.

From PVE server:

:~# test -w /dev/ttyACM0 && echo success || echo failure
success

:~# ls -la /dev/ttyACM0
crw-rw-rw- 1 root dialout 166, 0 Jul 25 10:54 /dev/ttyACM0

From LXC container:

:~# test -w /dev/ttyACM0 && echo success || echo failure
failure

:~# ls -la /dev/ttyACM0
crw-rw-rw- 1 root dialout 166, 0 Jul 25 10:54 /dev/ttyACM0

LXC config file includes:

lxc.cgroup.devices.allow: c 166:* rwm
lxc.mount.entry: /dev/ttyACM0 dev/ttyACM0 none bind,optional,create=file

Device is visible with lsusb from the PVE server and the LXC container.

Everything seems to be ok except that the LXC container has no read and write permission to /dev/ttyACM0 since the PVE 7.0.x upgrade.

Any advice is welcome,

Regards,

 

[leesteken]

Have you tried replacing all cgroup occurrences with cgroup2? That seemed to fix it for other people here. See the manual for more information.

 

[YAGA]

Hi @avw

Very good point, it works !

I haven't seen this change (cgroup -> cgroup2) in the last major upgrade between PVE 6.x to 7.x.

Many thanks,

Regards,

 

[greenice]

Hi @avw

Very good point, it works !

I haven't seen this change (cgroup -> cgroup2) in the last major upgrade between PVE 6.x to 7.x.

Many thanks,

Regards,

I have replaced all cgroup with cgroup2. But problem still exists. Can you help me ?

 

[leesteken]

I have replaced all cgroup with cgroup2. But problem still exists. Can you help me ?

Not without more information. What is the container configuration? What problem do you have? If it's not the same, maybe start another thread on this forum.