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 "qemu/osdep.h"
  13 #include "sysemu/hostmem.h"
  14 #include "qapi/error.h"
  15 #include "qom/object_interfaces.h"
  16
  17 #define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
  18
  19
  20 static void
  21 ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
  22 {
  23     char *path;
  24
  25     if (!backend->size) {
  26         error_setg(errp, "can't create backend with size 0");
  27         return;
  28     }
  29
  30     path = object_get_canonical_path_component(OBJECT(backend));
  31     memory_region_init_ram_shared_nomigrate(&backend->mr, OBJECT(backend), path,
  32                            backend->size, backend->share, errp);
  33     g_free(path);
  34 }
  35
  36 static void
  37 ram_backend_class_init(ObjectClass *oc, void *data)
  38 {
  39     HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
  40
  41     bc->alloc = ram_backend_memory_alloc;
  42 }
  43
  44 static const TypeInfo ram_backend_info = {
  45     .name = TYPE_MEMORY_BACKEND_RAM,
  46     .parent = TYPE_MEMORY_BACKEND,
  47     .class_init = ram_backend_class_init,
  48 };
  49
  50 static void register_types(void)
  51 {
  52     type_register_static(&ram_backend_info);
  53 }
  54
  55 type_init(register_types);