spapr: Don't use spapr_drc_needed() in CAS code
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>
diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index fc62e04..4c35ce7 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -456,23 +456,31 @@
}
}
-bool spapr_drc_needed(void *opaque)
+bool spapr_drc_transient(SpaprDrc *drc)
{
- SpaprDrc *drc = (SpaprDrc *)opaque;
SpaprDrcClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
- /* If no dev is plugged in there is no need to migrate the DRC state */
+ /*
+ * If no dev is plugged in there is no need to migrate the DRC state
+ * nor to reset the DRC at CAS.
+ */
if (!drc->dev) {
return false;
}
/*
- * We need to migrate the state if it's not equal to the expected
- * long-term state, which is the same as the coldplugged initial
- * state */
+ * We need to reset the DRC at CAS or to migrate the DRC state if it's
+ * not equal to the expected long-term state, which is the same as the
+ * coldplugged initial state.
+ */
return (drc->state != drck->ready_state);
}
+static bool spapr_drc_needed(void *opaque)
+{
+ return spapr_drc_transient(opaque);
+}
+
static const VMStateDescription vmstate_spapr_drc = {
.name = "spapr_drc",
.version_id = 1,
