[Bug 787091] Re: Unable to use USB device in KVM quest

[Serge Hallyn]

I can only think of one other explanation, the devices cgroup.  Can you,
while that VM is running, do

ps -ef

to get the PID of the kvm process, then do

cat /proc/$PID/cgroup

(substituting in the pid)?

Assuming it reads something like

1:blkio,net_cls,freezer,devices,memory,cpuacct,cpu,ns,cpuset:/libvirt/qemu/lxc-natty-amd64
 
you would then find the cgroups mountpoint using
   mount | grep cgroup
and print out the device whitelist using:

cat /cgroup/libvirt/qemu/lxc-natty-amd64

(substituting your cgroup mountpoint for '/cgroup').

If I'm not being clear enough here, please start by just giving me the
output of:

   for p in `pidof kvm`; do
      cat /proc/$p/cgroup
   done
   mount | grep cgroup

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https://bugs.launchpad.net/bugs/787091

Title:
  Unable to use USB device in KVM quest

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