# Pastebin pv6e5QOF
~/test » sudo virsh dumpxml cirros | grep disk
    <suspend-to-disk enabled='no'/>
    <disk type='file' device='disk'>
      <source file='/home/lseki/test/cirros-0.5.1-x86_64-disk.img'/>
    </disk>
~/test » sudo virsh qemu-monitor-command cirros --hmp "block_resize disk 4G"              
Cannot find device=disk nor node_name=