Same or at least similar problem here. VM runs is a clean Server ubuntu-12.04.2-server-amd64 with only ssh installed.
Host System is a Raring System also 64bit setup with virt-install Apparmor is deinstalled so it won't disturb/distract qemu.conf has two changes: a) user= "+0", so that permission issues won't disturb the testcase. b) cgroup_controllers = [ "cpu", "devices", "memory", "blkio", "cpuset", "cpuacct" ] cgroup-lite is installled and mounts cgroups ! if i now use qemu monitor to passthrough a device by hostport like that(take sensible bus and port to reproduce): add_device usb-host,hostbus=8,hostport=2 i see permission denied errors: husb: open /dev/bus/usb/008/008: Operation not permitted husb: open /dev/bus/usb/008/009: Operation not permitted once i unmount all cgroup, everything works fine. the devices apear in the vm once they are pluged in. i see the same thing happenning on other machinges with ubuntu-12.04.2 guest on ubuntu-12.04.2 host(fairly fresh install). hth -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/787091 Title: Unable to use USB device in KVM quest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/787091/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
