[Qemu-devel] [PATCH v2 09/11] pc: add cpu hot unplug callback support

[Zhu Guihua]

From: Gu Zheng <address@hidden>

Signed-off-by: Gu Zheng <address@hidden>
Signed-off-by: Zhu Guihua <address@hidden>
---
 hw/i386/pc.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index dd6e8da..b7d5712 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1722,6 +1722,24 @@ out:
     error_propagate(errp, local_err);
 }
 
+static void pc_cpu_unplug(HotplugHandler *hotplug_dev,
+                          DeviceState *dev, Error **errp)
+{
+    HotplugHandlerClass *hhc;
+    Error *local_err = NULL;
+    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
+
+    hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
+    hhc->unplug(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    /* decrement the number of CPUs */
+    rtc_set_memory(pcms->rtc, 0x5f, rtc_get_memory(pcms->rtc, 0x5f) - 1);
+}
+
 static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                       DeviceState *dev, Error **errp)
 {
@@ -1746,8 +1764,12 @@ static void 
pc_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
 static void pc_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
-    error_setg(errp, "acpi: device unplug for not supported device"
-               " type: %s", object_get_typename(OBJECT(dev)));
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        pc_cpu_unplug(hotplug_dev, dev, errp);
+    } else {
+        error_setg(errp, "acpi: device unplug for not supported device"
+                   " type: %s", object_get_typename(OBJECT(dev)));
+    }
 }
 
 static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
-- 
1.9.3