I have nothing to add to my original message:
  
https://www.redhat.com/archives/libguestfs/2017-August/msg00140.html
Please read it and the linked documentation carefully.
Rich.
-- 
Richard Jones, Virtualization Group, Red Hat 
http://people.redhat.com/~rjones
Read my programming and virtualization blog: 
http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top