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We currently don't support hotplug of devices between boot and CAS. If this happens a CAS reboot is triggered. We detect this during CAS using the spapr_drc_needed() function which is essentially a VMStateDescription .needed callback. Even if the condition for CAS reboot happens to be the same as for DRC migration, it looks wrong to piggyback a migration helper for this. Introduce a helper with slightly more explicit name and use it in both CAS and DRC migration code. Since a subsequent patch will enhance this helper to cover the case of hot unplug, let's go for spapr_drc_transient(). While here convert spapr_hotplugged_dev_before_cas() to the "transient" wording as well. This doesn't change any behaviour. Signed-off-by: Greg Kurz <groug@kaod.org> Message-Id: <158169248180.3465937.9531405453362718771.stgit@bahia.lan> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>