--- 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"
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https://bugs.launchpad.net/bugs/1861299
Title:
s390x: migration to 4.2 makes it unable to migrate back to 4.0
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