How do I make a persistent domain with virsh?
Use virsh define somefile.xml and virsh start domain-name, doing this the VM will be persistent.
I can't check right now, but I think you can use virsh define on an already started VM and this will make it persistent.
If you don't have the xml for the running vm (eg. after transient migration), you can do
virsh dumpxml vm_name > vm_name.xml
virsh define vm_name.xml
To check:
virsh list --all --persistent
The VM should now be listed. Or
virsh dominfo vm_name
There should be a line with 'Persistent: yes'.