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-rw-r--r--include/hw/boards.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 3b7c30e853..ed83360198 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -298,11 +298,13 @@ struct MachineClass {
  * address space for memory devices starts
  * @mr: address space container for memory devices
  * @dimm_size: the sum of plugged DIMMs' sizes
+ * @used_region_size: the part of @mr already used by memory devices
  */
 typedef struct DeviceMemoryState {
     hwaddr base;
     MemoryRegion mr;
     uint64_t dimm_size;
+    uint64_t used_region_size;
 } DeviceMemoryState;
 
 /**