qemu/arm-virt-Add-CPU-hotplug-framework.patch

From 6d287b3f1d961cc4adda1c6a452f41db84466f5a Mon Sep 17 00:00:00 2001
From: Keqian Zhu <zhukeqian1@huawei.com>
Date: Fri, 3 Apr 2020 16:16:18 +0800
Subject: [PATCH] arm/virt: Add CPU hotplug framework

Establish the CPU hotplug framework for arm/virt, we will add
necessary code legs to this framework gradually to realize CPU
hotplug finally.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
 hw/arm/virt.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index d09a5773df..0bd37af26c 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2077,11 +2077,25 @@ out:
     error_propagate(errp, local_err);
 }

+static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev,
+                              DeviceState *dev, Error **errp)
+{
+    /* Currently nothing to do */
+}
+
+static void virt_cpu_plug(HotplugHandler *hotplug_dev,
+                          DeviceState *dev, Error **errp)
+{
+    /* Currently nothing to do */
+}
+
 static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
                                             DeviceState *dev, Error **errp)
 {
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         virt_memory_pre_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        virt_cpu_pre_plug(hotplug_dev, dev, errp);
     }
 }

@@ -2098,6 +2112,8 @@ static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
     }
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         virt_memory_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        virt_cpu_plug(hotplug_dev, dev, errp);
     }
 }

@@ -2112,7 +2128,8 @@ static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
                                                         DeviceState *dev)
 {
     if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE) ||
-       (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM))) {
+        object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
+        object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
         return HOTPLUG_HANDLER(machine);
     }

--
2.19.1