From: Jonathan Cameron <jonathan.cameron@huawei.com>

Inorder to implement memory interleaving we need a means to proxy
the calls. Adding mem_ops allows such proxying.

Note should have no impact on use cases not using _dispatch_read/write.
For now, only file backed hostmem is considered to seek feedback on
the approach before considering other hostmem backends.

Signed-off-by: Jonathan Cameron <jonathan.cameron@huawei.com>
---
 softmmu/memory.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/softmmu/memory.c b/softmmu/memory.c
index 678dc62f06..d537091c63 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1606,6 +1606,15 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
     Error *err = NULL;
     memory_region_init(mr, owner, name, size);
     mr->ram = true;
+
+    /*
+     * ops used only when directly accessing via
+     * - memory_region_dispatch_read()
+     * - memory_region_dispatch_write()
+     */
+    mr->ops = &ram_device_mem_ops;
+    mr->opaque = mr;
+
     mr->readonly = readonly;
     mr->terminates = true;
     mr->destructor = memory_region_destructor_ram;
-- 
2.32.0