[Qemu-devel] [RESEND PATCH v3 3/8] pc: Add memory hot unplug support for pc machine.

[Tang Chen <tangchen@cn.fujitsu.com>]

From: Hu Tao <hutao@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 <hutao@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
---
 hw/i386/pc.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 8fa8d2f..8bafe7c 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
@@ -1607,6 +1609,27 @@ out:
     error_propagate(errp, local_err);
 }
 
+static void pc_dimm_unplug(HotplugHandler *hotplug_dev,
+                           DeviceState *dev, Error **errp)
+{
+    Object *acpi_dev;
+    HotplugHandlerClass *hhc;
+    Error *local_err = NULL;
+
+    acpi_dev = (acpi_dev = piix4_pm_find()) ? acpi_dev : ich9_lpc_find();
+    if (!acpi_dev) {
+        error_setg(&local_err,
+                   "memory hotplug is not enabled: missing acpi device");
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    hhc = HOTPLUG_HANDLER_GET_CLASS(acpi_dev);
+    hhc->unplug(HOTPLUG_HANDLER(acpi_dev), dev, &local_err);
+
+    error_propagate(errp, local_err);
+}
+
 static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                       DeviceState *dev, Error **errp)
 {
@@ -1615,6 +1638,14 @@ 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)
 {
@@ -1701,6 +1732,7 @@ 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