[libvirt] question about MigrateSetMaxDowntime

A user asked me about setting max downtime prior to migration, which I thought could be done similar to MigrateSetMaxSpeed. I was surprised to find that it can only be set when migration is in progress # virsh migrate-setmaxdowntime test 1000 error: Requested operation is not valid: domain is not being migrated Is there any reason this cannot be set prior to migration? Max speed can even be set on a persistent domain that is not running. I'd be happy to work on a patch if the only reason is no one has needed this itch scratched. Regards, Jim