Ok now, it needs cgroup permission On 2013年10月31日 14:16, lof yer wrote:

I add a qemu-cmd hook to localhost. "-device usb-host:vendorid=0718,productid=0083"

And in the qemu/usb-test.log I find ".... Domain id=6 is tainted: custom-argv husb: open device 2.7 /dev/bus/usb/002/007: Operation not permitted husb: open device 2.7 /dev/bus/usb/002/007: Operation not permitted husb: open device 2.7 /dev/bus/usb/002/007: Operation not permitted qemu: terminating on signal 15 from pid 3534 2013-10-31 05:48:36.483+0000: shutting down"

I'd set setuid of /usr/libexec/qemu-kvm, is there some other configuration?