How to providing virtual USB disk (usb-storage for QEMU) devices to guests?

[oPKo o <opko@xxxxxxxxxxx>]

Hi,
I am trying to provide virtual USB disk devices to guests but without success. With QEMU is simple to plug the virtual USB disk with the command:

(qemu) drive_add 0 id=my_usb_disk,if=none,file=usbdisk.img
OK
(qemu) device_add usb-storage,id=my_usb_disk,drive=my_usb_dis

I can do this with libvirt?

PK

PS: sorry for my poor english