How to auto-hotplug usb devices to libvirt VMs (Update 1)
Monday, 11 April 20112014-02-26:
I've updated this HowTo for current versions of udev and kvm.
libvirt/kvm allows you to expose any usb device attached to your physical maschine to the guests. Just edit the domain's XML definition and add the following <hostdev> to the <devices> area: