We will need a handful of new functions:
- set_addr(): To set the calculated address
- get_memory_region(): To add it to the memory region container
- get_addr(): If the device has any specific alignment requirements

Using these and the existing functions, we can properly plug/unplug
memory devices.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 include/hw/mem/memory-device.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h
index 2853b084b5..62d906be50 100644
--- a/include/hw/mem/memory-device.h
+++ b/include/hw/mem/memory-device.h
@@ -29,14 +29,24 @@ typedef struct MemoryDeviceState {
     Object parent_obj;
 } MemoryDeviceState;
 
+/*
+ * MemoryDeviceClass functions should only be called on realized
+ * MemoryDevice instances.
+ */
 typedef struct MemoryDeviceClass {
     InterfaceClass parent_class;
 
+    /* required functions that have to be implemented */
     uint64_t (*get_addr)(const MemoryDeviceState *md);
+    void (*set_addr)(MemoryDeviceState *md, uint64_t addr);
+    MemoryRegion *(*get_memory_region)(MemoryDeviceState *md);
     uint64_t (*get_plugged_size)(const MemoryDeviceState *md);
     uint64_t (*get_region_size)(const MemoryDeviceState *md);
     void (*fill_device_info)(const MemoryDeviceState *md,
                              MemoryDeviceInfo *info);
+
+    /* optional functions that can be implemented */
+    uint64_t (*get_align)(const MemoryDeviceState *md);
 } MemoryDeviceClass;
 
 MemoryDeviceInfoList *qmp_memory_device_list(void);
-- 
2.14.3