[libvirt] USB 2.0 support in qemu

[Gerd Hoffmann]

   Hi,

Recently USB 2.0 support was merged into upstream qemu, I guess libvirt 
and virt-manager needs some bits to support this ...

The docs/usb2.txt file in the qemu source tree carries some information 
on how to use it, and also some hints for USB pass-through.  The most 
recent version (not yet merged upstream) can be found here:

http://www.kraxel.org/cgit/qemu/tree/docs/usb2.txt?h=usb.15

If there are any questions feel free to ask.

cheers,
   Gerd