[libvirt] need custom /dev entries in LXC

[Michael R. Hines]

Hi,

We run nvidia devices inside libvirt-managed LXC containers.

It used to be that simply doing:

$ echo 'c 195:* rwm' > /sys/fs/cgroup/devices/libvirt/lxc

Then, after booting the container, we would do:

$ mknod -m 666 /dev/nvidia0 c 195 0

.... would be good enough to run our CUDA applications.

But, according to:

$ cat src/lxc/lxc_container.c

The CAP_MKNOD capability is being dropped and only a specific
set of devices is being created before booting the container.

Is there any reason why this is not per-device configurable?

Thanks,
- Michael R. Hines