Comment 5 for bug 1010893

I am having problems with kvm-spice trying to use filesystem, it is giving the same message reported by many sources which reference PCI passthrough, I don't know if they rely on a similar mechanism behind the scenes, I am a bit of a noob, but I can't see a problem with the use of <filesystem>

<filesystem rtpe="mount" accessmode="squash">
    <driver type="path" />
    <source dir="/var/lib/libvirt/drivers" />
    <target dir="/host/drivers" />
    <readonly />
 </filesystem>

error: Failed to start domain VM7
error: internal error process exited while connecting to monitor: char device redirected to /dev/pts/1
kvm: -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=/var/lib/libvirt/drivers,bus=pci.0,addr=0x3: Parameter 'driver' expects device type

qemu-kvm-spice:
  Installed: 1.2.0-2012.09-0ubuntu1
  Candidate: 1.2.0-2012.09-0ubuntu1
  Version table:
 *** 1.2.0-2012.09-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ quantal/universe amd64 Packages
        100 /var/lib/dpkg/status