Hello everybody, I try to doing USB pass-through with XEN hypervisor using libvirt and i get the following error: # virsh attach-device c6test /tmp/usb_device.xml error: Failed to attach device from /tmp/usb_device.xml error: unsupported configuration: unsupported device type # cat /tmp/usb_device.xml <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id="0x0529" /> <product id="0x0001" /> </source> </hostdev> But using xm command, the USB pass-through has been successfully # xm usb-add c6test host:0529:0001 I try it on Fedora 17 with libvirt 1.0.4 and xen 4.2.1. Does anyone know how can i do to put libvirt work with XEN USB pass-through? Best regards, -- Carlos Rodrigues <cmar(a)eurotux.com&gt; Engenheiro de Software Sénior Eurotux Informática, S.A. | www.eurotux.com (t) +351 253 680 300