[Qemu-devel] [PATCH v4 07/12] pc: Add memory hot unplug support for pc machine.

[Tang Chen]

From: Hu Tao <hu...@cn.fujitsu.com>

Implement device unplug callback for PCMachine. And it now only support
pc-dimm hot-remove. The callback will call piix4 or ich9 callbacks introduced
in previous patches.

Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangc...@cn.fujitsu.com>
---
 hw/i386/pc.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index d045e8b..4b7cfe0 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -61,6 +61,8 @@
 #include "hw/mem/pc-dimm.h"
 #include "trace.h"
 #include "qapi/visitor.h"
+#include "hw/acpi/piix4.h"
+#include "hw/i386/ich9.h"
 
 /* debug PC/ISA interrupts */
 //#define DEBUG_IRQ
@@ -1617,6 +1619,26 @@ out:
     error_propagate(errp, local_err);
 }
 
+static void pc_dimm_unplug(HotplugHandler *hotplug_dev,
+                           DeviceState *dev, Error **errp)
+{
+    HotplugHandlerClass *hhc;
+    Error *local_err = NULL;
+    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
+
+    if (!pcms->acpi_dev) {
+        error_setg(&local_err,
+                   "memory hotplug is not enabled: missing acpi device");
+       goto out;
+    }
+
+    hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
+    hhc->unplug(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
+
+out:
+    error_propagate(errp, local_err);
+}
+
 static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                       DeviceState *dev, Error **errp)
 {
@@ -1625,6 +1647,14 @@ static void pc_machine_device_plug_cb(HotplugHandler 
*hotplug_dev,
     }
 }
 
+static void pc_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
+                                        DeviceState *dev, Error **errp)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        pc_dimm_unplug(hotplug_dev, dev, errp);
+    }
+}
+
 static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
                                              DeviceState *dev)
 {
@@ -1711,6 +1741,7 @@ static void pc_machine_class_init(ObjectClass *oc, void 
*data)
     pcmc->get_hotplug_handler = mc->get_hotplug_handler;
     mc->get_hotplug_handler = pc_get_hotpug_handler;
     hc->plug = pc_machine_device_plug_cb;
+    hc->unplug = pc_machine_device_unplug_cb;
 }
 
 static const TypeInfo pc_machine_info = {
-- 
1.8.4.2