s390x/sclp: add device to the sysbus in sclp_realize

The init of a device should have no side effects. Therefore move
registering of the event facility into the realize function, so
multiple instances of the SCLP device can be created e.g. for
introspection.

Add some more detail as to why we have to add it to the sysbus
at all.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 74f2b40..23dee88 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -465,6 +465,12 @@ static void sclp_realize(DeviceState *dev, Error **errp)
     if (err) {
         goto out;
     }
+    /*
+     * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
+     * as we can't find a fitting bus via the qom tree, we have to add the
+     * event facility to the sysbus, so e.g. a sclp console can be created.
+     */
+    qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
 
     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
     if (ret == -E2BIG) {
@@ -533,8 +539,6 @@ static void sclp_init(Object *obj)
 
     new = object_new(TYPE_SCLP_EVENT_FACILITY);
     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
-    /* qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS */
-    qdev_set_parent_bus(DEVICE(new), sysbus_get_default());
     object_unref(new);
     sclp->event_facility = EVENT_FACILITY(new);