[Qemu-devel] [PATCH v3 1/8] acpi, piix4: Add memory hot unplug support for piix4.

[Tang Chen]

From: Hu Tao <address@hidden>

Implement acpi_memory_unplug_cb(), sending an sci to guest to trigger
memory hot-remove, and call it in piix4_device_unplug_cb().

Signed-off-by: Hu Tao <address@hidden>
Signed-off-by: Tang Chen <address@hidden>
---
 hw/acpi/memory_hotplug.c         | 25 +++++++++++++++++++++++++
 hw/acpi/piix4.c                  |  3 +++
 include/hw/acpi/memory_hotplug.h |  2 ++
 3 files changed, 30 insertions(+)

diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index ed39241..c310b44 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -195,6 +195,31 @@ void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, 
MemHotplugState *mem_st,
     return;
 }
 
+void acpi_memory_unplug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
+                           DeviceState *dev, Error **errp)
+{
+    Error *local_err = NULL;
+    int slot = object_property_get_int(OBJECT(dev), "slot", &local_err);
+
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (slot >= mem_st->dev_count) {
+        char *dev_path = object_get_canonical_path(OBJECT(dev));
+        error_setg(errp, "acpi_memory_plug_cb: "
+                   "device [%s] returned invalid memory slot[%d]",
+                   dev_path, slot);
+        g_free(dev_path);
+        return;
+    }
+
+    /* do ACPI magic */
+    ar->gpe.sts[0] |= ACPI_MEMORY_HOTPLUG_STATUS;
+    acpi_update_sci(ar, irq);
+}
+
 static const VMStateDescription vmstate_memhp_sts = {
     .name = "memory hotplug device state",
     .version_id = 1,
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index b72b34e..c1d5187 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -362,6 +362,9 @@ static void piix4_device_unplug_cb(HotplugHandler 
*hotplug_dev,
     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_unplug_cb(&s->ar, s->irq, &s->acpi_pci_hotplug, dev,
                                     errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        acpi_memory_unplug_cb(&s->ar, s->irq, &s->acpi_memory_hotplug, dev,
+                              errp);
     } else {
         error_setg(errp, "acpi: device unplug request for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
index 7bbf8a0..fc6b868 100644
--- a/include/hw/acpi/memory_hotplug.h
+++ b/include/hw/acpi/memory_hotplug.h
@@ -28,6 +28,8 @@ void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
 
 void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
                          DeviceState *dev, Error **errp);
+void acpi_memory_unplug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
+                           DeviceState *dev, Error **errp);
 
 extern const VMStateDescription vmstate_memory_hotplug;
 #define VMSTATE_MEMORY_HOTPLUG(memhp, state) \
-- 
1.8.4.2