4 files changed, 47 insertions, 8 deletions
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index e8363d7248..f91581fc65 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -297,11 +297,6 @@ CPUArchState *cpu_copy(CPUArchState *env);
 
 /* memory API */
 
-extern ram_addr_t ram_size;
-
-/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
-#define RAM_PREALLOC_MASK   (1 << 0)
-
 typedef struct RAMBlock {
     struct MemoryRegion *mr;
     uint8_t *host;
@@ -327,9 +322,6 @@ 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/cpu-common.h b/include/exec/cpu-common.h
index 89ec6404cf..e3ec4c8e0c 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -45,6 +45,8 @@ typedef uintptr_t ram_addr_t;
 #  define RAM_ADDR_FMT "%" PRIxPTR
 #endif
 
+extern ram_addr_t ram_size;
+
 /* memory API */
 
 typedef void CPUWriteMemoryFunc(void *opaque, hwaddr addr, uint32_t value);
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 549ae734e6..3d778d70f0 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -31,6 +31,7 @@
 #include "qemu/queue.h"
 #include "qemu/int128.h"
 #include "qemu/notify.h"
+#include "qapi/error.h"
 
 #define MAX_PHYS_ADDR_SPACE_BITS 62
 #define MAX_PHYS_ADDR            (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@@ -311,6 +312,28 @@ void memory_region_init_ram(MemoryRegion *mr,
                             const char *name,
                             uint64_t size);
 
+#ifdef __linux__
+/**
+ * memory_region_init_ram_from_file:  Initialize RAM memory region with a
+ *                                    mmap-ed backend.
+ *
+ * @mr: the #MemoryRegion to be initialized.
+ * @owner: the object that tracks the region's reference count
+ * @name: the name of the region.
+ * @size: size of the region.
+ * @share: %true if memory must be mmaped with the MAP_SHARED flag
+ * @path: the path in which to allocate the RAM.
+ * @errp: pointer to Error*, to store an error if it happens.
+ */
+void memory_region_init_ram_from_file(MemoryRegion *mr,
+                                      struct Object *owner,
+                                      const char *name,
+                                      uint64_t size,
+                                      bool share,
+                                      const char *path,
+                                      Error **errp);
+#endif
+
 /**
  * memory_region_init_ram_ptr:  Initialize RAM memory region from a
  *                              user-provided pointer.  Accesses into the
@@ -513,6 +536,16 @@ bool memory_region_is_logging(MemoryRegion *mr);
 bool memory_region_is_rom(MemoryRegion *mr);
 
 /**
+ * memory_region_get_fd: Get a file descriptor backing a RAM memory region.
+ *
+ * Returns a file descriptor backing a file-based RAM memory region,
+ * or -1 if the region is not a file-based RAM memory region.
+ *
+ * @mr: the RAM or alias memory region being queried.
+ */
+int memory_region_get_fd(MemoryRegion *mr);
+
+/**
  * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
  *
  * Returns a host pointer to a RAM memory region (created with
@@ -848,6 +881,14 @@ void memory_region_set_alias_offset(MemoryRegion *mr,
 bool memory_region_present(MemoryRegion *container, hwaddr addr);
 
 /**
+ * memory_region_is_mapped: returns true if #MemoryRegion is mapped
+ * into any address space.
+ *
+ * @mr: a #MemoryRegion which should be checked if it's mapped
+ */
+bool memory_region_is_mapped(MemoryRegion *mr);
+
+/**
  * memory_region_find: translate an address/size relative to a
  * MemoryRegion into a #MemoryRegionSection.
  *
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index b94de02ea7..55ca67681f 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -22,9 +22,13 @@
 #ifndef CONFIG_USER_ONLY
 #include "hw/xen/xen.h"
 
+ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
+                                    bool share, const char *mem_path,
+                                    Error **errp);
 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);
+int qemu_get_ram_fd(ram_addr_t addr);
 void *qemu_get_ram_ptr(ram_addr_t addr);
 void qemu_ram_free(ram_addr_t addr);
 void qemu_ram_free_from_ptr(ram_addr_t addr);