Assign the specified values to the user name, or to the user ID and group IDs of the qvm process instance
user username[,gid]* | uid[:gid[,gid]*]
The user is a user in the hypervisor host, not in the guest that the VM being configured will host.
If you use the username[,gid]* form, the primary group is the one specified for username in /etc/passwd.