Can we additionally cut out the QemuOpts middleman in
usbback_portid_add()?
qdict = qdict_new();
qdict_put_str(qdict, "driver", "usb-host");
tmp = g_strdup_printf("%s.0", usbif->xendev.qdev.id);
qdict_put_str(qdict, "bus", tmp);
g_free(tmp);
tmp = g_strdup_printf("%s-%u", usbif->xendev.qdev.id, port);
qdict_put_str(qdict, "id", tmp);
g_free(tmp);
qdict_put_int(qdict, "port", port);
qdict_put_int(qdict, "hostbus", atoi(busid));
qdict_put_str(qdict, "hostport", portname);
opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict,
&error_abort);
usbif->ports[port - 1].dev = USB_DEVICE(qdev_device_add(opts, &local_err));
Trying this is up to you!
