Regarding issue 2), this is most probably due to the cpu mode setting:
<cpu mode='host-model'>
<model fallback='allow'/>
<topology sockets='1' cores='1' threads='1'/>
</cpu>
The nova.conf needs the setting "cpu_mode = none" in order to not have it set
to 'host-model'.
This setting has not been working on s390x - this is a statement as of Mitaka
and libvirt 1.2.21 at least
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https://bugs.launchpad.net/bugs/1564831
Title:
s390x: error booting instance
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