Hi, When I tried to attach the interface after detaching the same interface, the virsh command output the following and it failed:
# virsh detach-interface Domain01 network --mac 52:54:00:0d:78:92 Interface detached successfully # virsh attach-interface Domain01 network default --mac 52:54:00:0d:78:92 error: Failed to attach interface error: internal error unable to execute QEMU command 'device_add': Duplicate ID 'net0' for device # The reason is that a detached device is not removed from the list "qemu_device_opts", and this patch fixes it. Thanks Ken'ichi Ohmichi Signed-off-by: Ken'ichi Ohmichi <oomi...@mxs.nes.nec.co.jp> --- --- a/hw/qdev.c 2011-01-27 17:42:25.000000000 +0900 +++ b/hw/qdev.c 2011-01-27 17:43:46.000000000 +0900 @@ -905,6 +905,8 @@ int do_device_del(Monitor *mon, const QD qerror_report(QERR_DEVICE_NOT_FOUND, id); return -1; } + qemu_opts_del(qemu_opts_find(&qemu_device_opts, id)); + return qdev_unplug(dev); }