When memory hot unplug fails, this patch adds support to send
QMP event to notify mgmt about this failure.
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
Signed-off-by: NZhu Guihua <zhugh.fnst@cn.fujitsu.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>