------- Comment From cborn...@de.ibm.com 2020-02-07 04:17 EDT------- (In reply to comment #11) > Hi Christian, > summarizing for disambiguation: > > a) If I specify CPU model on the source it carries over correctly and can > migrate back
This is good. host-model is supposed to work. FWIW, custom is also supposed to work (e.g. -cpu z13). > b) If I specify nothing on the source it "becomes" host-model on the target > (with the features as detected there at the time) and those can't all go back This is also kind of expected. Specifying nothing was "host- passthrough". This is known to be NOT migration safe. Do not use it. Newer libvirt versions will now add "host-passthrough" in the xml when nothing is specified. As this is not migration-safe, I asked libvirt to change the default for s390 to become "host-model" instead of "host-passthrough". You should also see it as a feature that we add a check that tells you: "look, your migration is not safe" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861299 Title: s390x: migration to 4.2 makes it unable to migrate back to 4.0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1861299/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
