Umm, the latter is the official way to go, but only in latter libvirt versions. https://libvirt.org/git/?p=libvirt.git;a=commit;h=28907b0043fbf71085a798372ab9c816ba043b93
I'm adding a libvirt bug task for the bionic merge to pick that up "explicitly" ** Changed in: qemu (Ubuntu) Status: New => Won't Fix ** Also affects: libvirt (Ubuntu) Importance: Undecided Status: New ** Changed in: libvirt (Ubuntu) Status: New => Triaged ** Tags added: libvirt-18.04 ** Changed in: qemu Status: New => Opinion -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1716028 Title: qemu 2.10 locks images with no feature flag To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1716028/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs