@@ -29,12 +29,48 @@ typedef struct MemoryDeviceState {
Object parent_obj;
} MemoryDeviceState;
+/**
+ * MemoryDeviceClass:
+ *
+ * All memory devices need to implement TYPE_MEMORY_DEVICE as an interface.
+ *
+ * A memory device is a device that owns a memory region which is
+ * mapped into guest physical address space at a certain address. The
+ * address in guest physical memory can either be specified explicitly
+ * or get assigned automatically.
+ */
typedef struct MemoryDeviceClass {
+ /* private */
InterfaceClass parent_class;
+ /*
+ * Return the address of the memory device in guest physical memory.
+ *
+ * Called when (un)plugging a memory device or when iterating over
+ * all memory devices mapped into guest physical address space.
+ *
+ * If "0" is returned, no address has been specified by the user and
+ * no address has been assigned to this memory device yet.
+ */
uint64_t (*get_addr)(const MemoryDeviceState *md);
+
+ /*
+ * Return the amount of memory provided by the memory device currently
+ * usable ("plugged") by the VM.
+ *
+ * Called when calculating the total amount of ram available to the
+ * VM (e.g. to report memory stats to the user).
+ *
+ * This is helpful for devices that dynamically manage the amount of
+ * memory accessible by the guest via the reserved memory region. For
+ * most devices, this corresponds to the size of the memory region.
+ */
uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp);
uint64_t (*get_region_size)(const MemoryDeviceState *md, Error **errp);
+
+ /*
+ * Translate the memory device into #MemoryDeviceInfo.
+ */
void (*fill_device_info)(const MemoryDeviceState *md,
MemoryDeviceInfo *info);
} MemoryDeviceClass;