s390x/kvm: propagate s390 cpu state to kvm

s390x/kvm: propagate s390 cpu state to kvm

Let QEMU propagate the cpu state to kvm. If kvm doesn't yet support it, it is
silently ignored as kvm will still handle the cpu state itself in that case.

The state is not synced back, thus kvm won't have a chance to actively modify
the cpu state. To do so, control has to be given back to QEMU (which is already
done so in all relevant cases).

Setting of the cpu state can fail either because kvm doesn't support the
interface yet, or because the state is invalid/not supported. Failed attempts
will be traced

Signed-off-by: David Hildenbrand <[email protected]>
Signed-off-by: Jens Freimann <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
CC: Andreas Faerber <[email protected]>
Tested-by: Christian Borntraeger <[email protected]>
Signed-off-by: Cornelia Huck <[email protected]>