memory: move mem_path handling to memory_region_allocate_system_memory

Like the previous patch did in exec.c, split memory_region_init_ram and
memory_region_init_ram_from_file, and push mem_path one step further up.
Other RAM regions than system memory will now be backed by regular RAM.

Also, boards that do not use memory_region_allocate_system_memory will
not support -mem-path anymore.  This can be changed before the patches
are merged by migrating boards to use the function.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 16 insertions, 5 deletions

diff --git a/memory.c b/memory.c
index 063effec6b..09f98fcbe6 100644
--- a/memory.c
+++ b/memory.c
@@ -1030,13 +1030,24 @@ void memory_region_init_ram(MemoryRegion *mr,
     mr->ram = true;
     mr->terminates = true;
     mr->destructor = memory_region_destructor_ram;
-    if (mem_path) {
-        mr->ram_addr = qemu_ram_alloc_from_file(size, mr, mem_path);
-    } else {
-        mr->ram_addr = qemu_ram_alloc(size, mr);
-    }
+    mr->ram_addr = qemu_ram_alloc(size, mr);
 }
 
+#ifdef __linux__
+void memory_region_init_ram_from_file(MemoryRegion *mr,
+                                      struct Object *owner,
+                                      const char *name,
+                                      uint64_t size,
+                                      const char *path)
+{
+    memory_region_init(mr, owner, name, size);
+    mr->ram = true;
+    mr->terminates = true;
+    mr->destructor = memory_region_destructor_ram;
+    mr->ram_addr = qemu_ram_alloc_from_file(size, mr, path);
+}
+#endif
+
 void memory_region_init_ram_ptr(MemoryRegion *mr,
                                 Object *owner,
                                 const char *name,