diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index fc01a294a4..a5550d1221 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -268,7 +268,7 @@ static void raven_pcihost_realizefn(DeviceState *d, Error **errp)
     memory_region_add_subregion(address_space_mem, 0xbffffff0, &s->pci_intack);
 
     /* TODO Remove once realize propagates to child devices. */
-    object_property_set_bool(OBJECT(&s->pci_dev), true, "realized", errp);
+    qdev_realize(DEVICE(&s->pci_dev), BUS(&s->pci_bus), errp);
 }
 
 static void raven_pcihost_initfn(Object *obj)
@@ -308,7 +308,6 @@ static void raven_pcihost_initfn(Object *obj)
 
     object_initialize(&s->pci_dev, sizeof(s->pci_dev), TYPE_RAVEN_PCI_DEVICE);
     pci_dev = DEVICE(&s->pci_dev);
-    qdev_set_parent_bus(pci_dev, BUS(&s->pci_bus));
     object_property_set_int(OBJECT(&s->pci_dev), PCI_DEVFN(0, 0), "addr",
                             NULL);
     qdev_prop_set_bit(pci_dev, "multifunction", false);
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 8562af3fe0..e0588285a2 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1212,12 +1212,11 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
         object_property_set_int(OBJECT(phb), i, "index", &error_fatal);
         object_property_set_int(OBJECT(phb), chip->chip_id, "chip-id",
                                 &error_fatal);
-        object_property_set_bool(OBJECT(phb), true, "realized", &local_err);
+        qdev_realize(DEVICE(phb), NULL, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
-        qdev_set_parent_bus(DEVICE(phb), sysbus_get_default());
 
         /* Populate the XSCOM address space. */
         pnv_xscom_add_subregion(chip,
@@ -1422,12 +1421,11 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
             object_property_set_int(obj, PNV_PHB4_DEVICE_ID, "device-id",
                                     &error_fatal);
             object_property_set_link(obj, OBJECT(stack), "stack", &error_abort);
-            object_property_set_bool(obj, true, "realized", &local_err);
+            qdev_realize(DEVICE(obj), NULL, &local_err);
             if (local_err) {
                 error_propagate(errp, local_err);
                 return;
             }
-            qdev_set_parent_bus(DEVICE(obj), sysbus_get_default());
 
             /* Populate the XSCOM address space. */
             pnv_xscom_add_subregion(chip,
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 20aca30ac4..40e27a8cb4 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -333,17 +333,15 @@ static void sclp_realize(DeviceState *dev, Error **errp)
     uint64_t hw_limit;
     int ret;
 
-    object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
-                             &err);
-    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());
+    qdev_realize(DEVICE(sclp->event_facility), NULL, &err);
+    if (err) {
+        goto out;
+    }
 
     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
     if (ret == -E2BIG) {