vmstate, memory: decouple vmstate from memory API

Currently creating a memory region automatically registers it for
live migration.  This differs from other state (which is enumerated
in a VMStateDescription structure) and ties the live migration code
into the memory core.

Decouple the two by introducing a separate API, vmstate_register_ram(),
for registering a RAM block for migration.  Currently the same
implementation is reused, but later it can be moved into a separate list,
and registrations can be moved to VMStateDescription blocks.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/hw/vga.c b/hw/vga.c
index 7e1dd5ac8..4878fbcbb 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -2222,7 +2222,8 @@ void vga_common_init(VGACommonState *s, int vga_ram_size)
 #else
     s->is_vbe_vmstate = 0;
 #endif
-    memory_region_init_ram(&s->vram, NULL, "vga.vram", vga_ram_size);
+    memory_region_init_ram(&s->vram, "vga.vram", vga_ram_size);
+    vmstate_register_ram_global(&s->vram);
     xen_register_framebuffer(&s->vram);
     s->vram_ptr = memory_region_get_ram_ptr(&s->vram);
     s->vram_size = vga_ram_size;