pc-dimm: move actual plug/unplug of a memory region to MemoryDevice

Registering the memory region for migration has do be done by the owner.
There could be cases, where we don't want to migrate the memory.
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20180423165126.15441-8-david@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

hw/mem/memory-device.c

@@ -243,6 +243,24 @@ uint64_t get_plugged_memory_size(void)
     return size;
 }
 
+void memory_device_plug_region(MachineState *ms, MemoryRegion *mr,
+                               uint64_t addr)
+{
+    /* we expect a previous call to memory_device_get_free_addr() */
+    g_assert(ms->device_memory);
+
+    memory_region_add_subregion(&ms->device_memory->mr,
+                                addr - ms->device_memory->base, mr);
+}
+
+void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr)
+{
+    /* we expect a previous call to memory_device_get_free_addr() */
+    g_assert(ms->device_memory);
+
+    memory_region_del_subregion(&ms->device_memory->mr, mr);
+}
+
 static const TypeInfo memory_device_info = {
     .name          = TYPE_MEMORY_DEVICE,
     .parent        = TYPE_INTERFACE,

hw/mem/pc-dimm.c

@@ -36,7 +36,6 @@ void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine,
                          uint64_t align, Error **errp)
 {
     int slot;
-    MemoryHotplugState *hpms = machine->device_memory;
     PCDIMMDevice *dimm = PC_DIMM(dev);
     PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
     MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm);
@@ -83,7 +82,7 @@ void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine,
     }
     trace_mhp_pc_dimm_assigned_slot(slot);
 
-    memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
+    memory_device_plug_region(machine, mr, addr);
     vmstate_register_ram(vmstate_mr, dev);
 
 out:
@@ -97,7 +96,7 @@ void pc_dimm_memory_unplug(DeviceState *dev, MachineState *machine)
     MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm);
     MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort);
 
-    memory_region_del_subregion(&machine->device_memory->mr, mr);
+    memory_device_unplug_region(machine, mr);
     vmstate_unregister_ram(vmstate_mr, dev);
 }
 

include/hw/mem/memory-device.h

@@ -44,5 +44,8 @@ uint64_t get_plugged_memory_size(void);
 uint64_t memory_device_get_free_addr(MachineState *ms, const uint64_t *hint,
                                      uint64_t align, uint64_t size,
                                      Error **errp);
+void memory_device_plug_region(MachineState *ms, MemoryRegion *mr,
+                               uint64_t addr);
+void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr);
 
 #endif