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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