memory: reorganize file-based allocation

Split the internal interface in exec.c to a separate function, and
push the check on mem_path up to memory_region_init_ram.

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>

2 files changed, 2 insertions, 3 deletions

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index ed28f1e..eaddea6 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -325,9 +325,6 @@ typedef struct RAMList {
 } RAMList;
 extern RAMList ram_list;
 
-extern const char *mem_path;
-extern int mem_prealloc;
-
 /* Flags stored in the low bits of the TLB virtual address.  These are
    defined so that fast path ram access is all zeros.  */
 /* Zero if TLB entry is valid.  */
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index b94de02..9b00638 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -22,6 +22,8 @@
 #ifndef CONFIG_USER_ONLY
 #include "hw/xen/xen.h"
 
+ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
+                                    const char *mem_path);
 ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
                                    MemoryRegion *mr);
 ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr);