hw/loongarch/virt: Add basic cpu plug interface framework

Add basic cpu hotplug interface framework, cpu hotplug interface is
stub function and only framework is added here.

Co-developed-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>

1 files changed, 29 insertions, 0 deletions

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 2bbbbbfbcf..2b4b60f718 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -816,6 +816,26 @@ static int virt_get_arch_id_from_topo(MachineState *ms, LoongArchCPUTopo *topo)
     return arch_id;
 }
 
+static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev,
+                              DeviceState *dev, Error **errp)
+{
+}
+
+static void virt_cpu_unplug_request(HotplugHandler *hotplug_dev,
+                                    DeviceState *dev, Error **errp)
+{
+}
+
+static void virt_cpu_unplug(HotplugHandler *hotplug_dev,
+                            DeviceState *dev, Error **errp)
+{
+}
+
+static void virt_cpu_plug(HotplugHandler *hotplug_dev,
+                          DeviceState *dev, Error **errp)
+{
+}
+
 static bool memhp_type_supported(DeviceState *dev)
 {
     /* we only support pc dimm now */
@@ -834,6 +854,8 @@ static void virt_device_pre_plug(HotplugHandler *hotplug_dev,
 {
     if (memhp_type_supported(dev)) {
         virt_mem_pre_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_LOONGARCH_CPU)) {
+        virt_cpu_pre_plug(hotplug_dev, dev, errp);
     }
 }
 
@@ -852,6 +874,8 @@ static void virt_device_unplug_request(HotplugHandler *hotplug_dev,
 {
     if (memhp_type_supported(dev)) {
         virt_mem_unplug_request(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_LOONGARCH_CPU)) {
+        virt_cpu_unplug_request(hotplug_dev, dev, errp);
     }
 }
 
@@ -870,6 +894,8 @@ static void virt_device_unplug(HotplugHandler *hotplug_dev,
 {
     if (memhp_type_supported(dev)) {
         virt_mem_unplug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_LOONGARCH_CPU)) {
+        virt_cpu_unplug(hotplug_dev, dev, errp);
     }
 }
 
@@ -897,6 +923,8 @@ static void virt_device_plug_cb(HotplugHandler *hotplug_dev,
         }
     } else if (memhp_type_supported(dev)) {
         virt_mem_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_LOONGARCH_CPU)) {
+        virt_cpu_plug(hotplug_dev, dev, errp);
     }
 }
 
@@ -906,6 +934,7 @@ static HotplugHandler *virt_get_hotplug_handler(MachineState *machine,
     MachineClass *mc = MACHINE_GET_CLASS(machine);
 
     if (device_is_dynamic_sysbus(mc, dev) ||
+        object_dynamic_cast(OBJECT(dev), TYPE_LOONGARCH_CPU) ||
         object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI) ||
         memhp_type_supported(dev)) {
         return HOTPLUG_HANDLER(machine);