[libvirt] USB hostdev de/reattaching

Hello, according to libvirt documentation, when using hostdev with USB device "...the user is responsible to call virNodeDeviceDettach (or virsh nodedev-detach) before starting the guest...". In libvirt-1.2.13-1.el7.x86_64, this leads to virsh nodedev-detach usb_usb1 error: Failed to detach device usb_usb1 error: invalid argument: device usb_usb1 is not a PCI device The failure is most probably caused in qemuNodeDeviceDeta where qemuNodeDeviceGetPCIInfo is called. Is it a bug, or usb hostdev can be done without detaching/reattaching? Thanks, mpolednik