Hi, I need a flexible USB passthrough of a USB-device. If the device is turned off by the current switch (230Volt) the VM should start and not claim that the USB device is left. Using: <devices> … <hostdev mode='subsystem' type='usb'> <source> <vendor id='0x152a'/> <product id='0x8180'/> </source> </hostdev> </devices> </domain> in libvirt XML-config file the boot process is stopped if the device is switched off. How can I configure the xml-file to make ich more flexible? Another possibility would be to passthrough USB-Slot No1 (or No 2, ...) to the VM. So an arbitrary USB-device that is plugged in to USB-Slot1 would be recognized by the VM. In another forum I got the hint to start the VM by: -usb -usbdevice host:0.* -usbdevice host:1.* to passthrough USB-Slot No1 and No 2. How can I configure that in libvirt xml-file? tia Eckard