backends/hostmem-ram.c

   1 /*
   2  * QEMU Host Memory Backend
   3  *
   4  * Copyright (C) 2013-2014 Red Hat Inc
   5  *
   6  * Authors:
   7  *   Igor Mammedov <imammedo@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12 #include "sysemu/hostmem.h"
  13 #include "qom/object_interfaces.h"
  14
  15 #define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
  16
  17
  18 static void
  19 ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
  20 {
  21     char *path;
  22
  23     if (!backend->size) {
  24         error_setg(errp, "can't create backend with size 0");
  25         return;
  26     }
  27
  28     path = object_get_canonical_path_component(OBJECT(backend));
  29     memory_region_init_ram(&backend->mr, OBJECT(backend), path,
  30                            backend->size, errp);
  31     g_free(path);
  32 }
  33
  34 static void
  35 ram_backend_class_init(ObjectClass *oc, void *data)
  36 {
  37     HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
  38
  39     bc->alloc = ram_backend_memory_alloc;
  40 }
  41
  42 static const TypeInfo ram_backend_info = {
  43     .name = TYPE_MEMORY_BACKEND_RAM,
  44     .parent = TYPE_MEMORY_BACKEND,
  45     .class_init = ram_backend_class_init,
  46 };
  47
  48 static void register_types(void)
  49 {
  50     type_register_static(&ram_backend_info);
  51 }
  52
  53 type_init(register_types);