[RFC 11/41] hw/core/topo: Add virtual method to check topology child

[Zhao Liu <zhao1.liu@xxxxxxxxxxxxxxx>]

From: Zhao Liu <zhao1.liu@xxxxxxxxx>

When a new topology child is to be inserted into the topology tree, its
parents (including non-direct parents) need to check if this child is
supported.

Add the virtual method to allow topology device to check the support for
their topology children.

Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
---
 hw/core/cpu-topo.c         | 22 ++++++++++++++++++++++
 include/hw/core/cpu-topo.h |  4 ++++
 2 files changed, 26 insertions(+)

diff --git a/hw/core/cpu-topo.c b/hw/core/cpu-topo.c
index e244f0a3564e..cba2dc747e74 100644
--- a/hw/core/cpu-topo.c
+++ b/hw/core/cpu-topo.c
@@ -168,6 +168,23 @@ static void cpu_topo_update_info(CPUTopoState *topo, bool 
is_realize)
     }
 }
 
+static void cpu_topo_check_support(CPUTopoState *topo, Error **errp)
+{
+    CPUTopoState *parent = topo->parent;
+    CPUTopoClass *tc;
+
+    while (parent) {
+        tc = CPU_TOPO_GET_CLASS(parent);
+        if (tc->check_topo_child) {
+            tc->check_topo_child(parent, topo, errp);
+            if (*errp) {
+                return;
+            }
+        }
+        parent = parent->parent;
+    }
+}
+
 static void cpu_topo_set_parent(CPUTopoState *topo, Error **errp)
 {
     Object *obj = OBJECT(topo);
@@ -191,6 +208,11 @@ static void cpu_topo_set_parent(CPUTopoState *topo, Error 
**errp)
     }
 
     if (topo->parent) {
+        cpu_topo_check_support(topo, errp);
+        if (*errp) {
+            return;
+        }
+
         cpu_topo_build_hierarchy(topo, errp);
         if (*errp) {
             return;
diff --git a/include/hw/core/cpu-topo.h b/include/hw/core/cpu-topo.h
index 79cd8606feca..1ffdb0be6d38 100644
--- a/include/hw/core/cpu-topo.h
+++ b/include/hw/core/cpu-topo.h
@@ -46,6 +46,8 @@ OBJECT_DECLARE_TYPE(CPUTopoState, CPUTopoClass, CPU_TOPO)
  * @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.
+ * @check_topo_child: Method to check the support for new child (including
+ *     direct child and non-direct child) to be added.
  */
 struct CPUTopoClass {
     /*< private >*/
@@ -55,6 +57,8 @@ struct CPUTopoClass {
     CPUTopoLevel level;
     void (*update_topo_info)(CPUTopoState *parent, CPUTopoState *child,
                              bool is_realize);
+    void (*check_topo_child)(CPUTopoState *parent, CPUTopoState *child,
+                             Error **errp);
 };
 
 /**
-- 
2.34.1