From: Zhao Liu <zhao1.liu@intel.com>

When a new topology device is inserted into the topology tree,
its'parents (including non-direct parent) need to update topology
information.

Add the virtual method to help parents on topology tree update
topology information statistics.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 hw/core/cpu-topo.c         | 20 ++++++++++++++++++++
 include/hw/core/cpu-topo.h |  4 ++++
 2 files changed, 24 insertions(+)

diff --git a/hw/core/cpu-topo.c b/hw/core/cpu-topo.c
index 3e0c183388d8..e244f0a3564e 100644
--- a/hw/core/cpu-topo.c
+++ b/hw/core/cpu-topo.c
@@ -154,6 +154,20 @@ static void cpu_topo_build_hierarchy(CPUTopoState *topo, Error **errp)
     cpu_topo_refresh_free_child_index(parent);
 }
 
+static void cpu_topo_update_info(CPUTopoState *topo, bool is_realize)
+{
+    CPUTopoState *parent = topo->parent;
+    CPUTopoClass *tc;
+
+    while (parent) {
+        tc = CPU_TOPO_GET_CLASS(parent);
+        if (tc->update_topo_info) {
+            tc->update_topo_info(parent, topo, is_realize);
+        }
+        parent = parent->parent;
+    }
+}
+
 static void cpu_topo_set_parent(CPUTopoState *topo, Error **errp)
 {
     Object *obj = OBJECT(topo);
@@ -178,6 +192,11 @@ static void cpu_topo_set_parent(CPUTopoState *topo, Error **errp)
 
     if (topo->parent) {
         cpu_topo_build_hierarchy(topo, errp);
+        if (*errp) {
+            return;
+        }
+
+        cpu_topo_update_info(topo, true);
     }
 }
 
@@ -203,6 +222,7 @@ static void cpu_topo_destroy_hierarchy(CPUTopoState *topo)
         return;
     }
 
+    cpu_topo_update_info(topo, false);
     QTAILQ_REMOVE(&parent->children, topo, sibling);
     parent->num_children--;
 
diff --git a/include/hw/core/cpu-topo.h b/include/hw/core/cpu-topo.h
index c0dfff9dc63b..79cd8606feca 100644
--- a/include/hw/core/cpu-topo.h
+++ b/include/hw/core/cpu-topo.h
@@ -44,6 +44,8 @@ OBJECT_DECLARE_TYPE(CPUTopoState, CPUTopoClass, CPU_TOPO)
 /**
  * CPUTopoClass:
  * @level: Topology level for this CPUTopoClass.
+ * @update_topo_info: Method to update topology information statistics when
+ *     new child (including direct child and non-direct child) is added.
  */
 struct CPUTopoClass {
     /*< private >*/
@@ -51,6 +53,8 @@ struct CPUTopoClass {
 
     /*< public >*/
     CPUTopoLevel level;
+    void (*update_topo_info)(CPUTopoState *parent, CPUTopoState *child,
+                             bool is_realize);
 };
 
 /**
-- 
2.34.1