[RFC 16/41] PPC/ppc-core: Limit plugged-threads and nr-threads to be equal

[Zhao Liu <zhao1.liu@xxxxxxxxxxxxxxx>]

From: Zhao Liu <zhao1.liu@xxxxxxxxx>

PPC supports CPU hotplug at core granularity, thus ppc-core only accepts
all CPUs in a core are plugged.

Check if plugged_threads and nr_threads are equal when ppc-core
realizes.

Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
---
 hw/ppc/ppc_core.c         | 18 ++++++++++++++++++
 include/hw/ppc/ppc_core.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/hw/ppc/ppc_core.c b/hw/ppc/ppc_core.c
index 4433b54af506..3857f3150052 100644
--- a/hw/ppc/ppc_core.c
+++ b/hw/ppc/ppc_core.c
@@ -53,20 +53,38 @@ static void powerpc_core_prop_set_core_id(Object *obj, Visitor *v,
     core->core_id = value;
 }
 
+static void powerpc_core_realize(DeviceState *dev, Error **errp)
+{
+    CPUCore *core = CPU_CORE(dev);
+    PowerPCCoreClass *ppc_class = POWERPC_CORE_GET_CLASS(dev);
+
+    if (core->plugged_threads != -1 &&
+        core->nr_threads != core->plugged_threads) {
+        error_setg(errp, "nr_threads and plugged-threads must be equal");
+        return;
+    }
+
+    ppc_class->parent_realize(dev, errp);
+}
+
 static void powerpc_core_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
+    PowerPCCoreClass *ppc_class = POWERPC_CORE_CLASS(oc);
 
     object_class_property_add(oc, "core-id", "int",
                               powerpc_core_prop_get_core_id,
                               powerpc_core_prop_set_core_id,
                               NULL, NULL);
+    device_class_set_parent_realize(dc, powerpc_core_realize,
+                                    &ppc_class->parent_realize);
 }
 
 static const TypeInfo powerpc_core_type_info = {
     .name = TYPE_POWERPC_CORE,
     .parent = TYPE_CPU_CORE,
     .abstract = true,
+    .class_size = sizeof(PowerPCCoreClass),
     .class_init = powerpc_core_class_init,
     .instance_size = sizeof(PowerPCCore),
 };
diff --git a/include/hw/ppc/ppc_core.h b/include/hw/ppc/ppc_core.h
index bcc83e426e3f..1207d220872a 100644
--- a/include/hw/ppc/ppc_core.h
+++ b/include/hw/ppc/ppc_core.h
@@ -34,6 +34,7 @@ struct PowerPCCoreClass {
     CPUCoreClass parent_class;
 
     /*< public >*/
+    DeviceRealize parent_realize;
 };
 
 struct PowerPCCore {
-- 
2.34.1