[Qemu-devel] [PATCH v2 07/17] spapr: handle pc-dimm unplug via hotplug handler chain

[David Hildenbrand]

Let's handle it via hotplug_handler_unplug(). E.g. necessary to hotplug/
unplug memory devices (which a pc-dimm is) later.

Signed-off-by: David Hildenbrand <da...@redhat.com>
---
 hw/ppc/spapr.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index a7c84ec34c..7881565d41 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3291,7 +3291,8 @@ static sPAPRDIMMState 
*spapr_recover_pending_dimm_state(sPAPRMachineState *ms,
 /* Callback to be called during DRC release. */
 void spapr_lmb_release(DeviceState *dev)
 {
-    sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_hotplug_handler(dev));
+    HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(dev);
+    sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_ctrl);
     sPAPRDIMMState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
 
     /* This information will get lost if a migration occurs
@@ -3309,9 +3310,21 @@ void spapr_lmb_release(DeviceState *dev)
 
     /*
      * Now that all the LMBs have been removed by the guest, call the
-     * pc-dimm unplug handler to cleanup up the pc-dimm device.
+     * unplug handler chain. This can never fail.
      */
-    pc_dimm_memory_unplug(dev, MACHINE(spapr));
+    hotplug_ctrl = qdev_get_hotplug_handler(dev);
+    hotplug_handler_unplug(hotplug_ctrl, dev, &error_abort);
+}
+
+static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
+                                Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
+    sPAPRDIMMState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
+
+    g_assert(ds);
+    g_assert(!ds->nr_lmbs);
+    pc_dimm_memory_unplug(dev, MACHINE(hotplug_dev));
     object_unparent(OBJECT(dev));
     spapr_pending_dimm_unplugs_remove(spapr, ds);
 }
@@ -3608,7 +3621,9 @@ static void spapr_machine_device_unplug(HotplugHandler 
*hotplug_dev,
     Error *local_err = NULL;
 
     /* final stage hotplug handler */
-    if (dev->parent_bus && dev->parent_bus->hotplug_handler) {
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        spapr_memory_unplug(hotplug_dev, dev, &local_err);
+    } else if (dev->parent_bus && dev->parent_bus->hotplug_handler) {
         hotplug_handler_unplug(dev->parent_bus->hotplug_handler, dev,
                                &local_err);
     }
-- 
2.14.3