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 static void
  20 ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
  21 {
  22     char *name;
  23
  24     if (!backend->size) {
  25         error_setg(errp, "can't create backend with size 0");
  26         return;
  27     }
  28
  29     name = host_memory_backend_get_name(backend);
  30     memory_region_init_ram_shared_nomigrate(&backend->mr, OBJECT(backend), name,
  31                            backend->size, backend->share, errp);
  32     g_free(name);
  33 }
  34
  35 static void
  36 ram_backend_class_init(ObjectClass *oc, void *data)
  37 {
  38     HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
  39
  40     bc->alloc = ram_backend_memory_alloc;
  41 }
  42
  43 static const TypeInfo ram_backend_info = {
  44     .name = TYPE_MEMORY_BACKEND_RAM,
  45     .parent = TYPE_MEMORY_BACKEND,
  46     .class_init = ram_backend_class_init,
  47 };
  48
  49 static void register_types(void)
  50 {
  51     type_register_static(&ram_backend_info);
  52 }
  53
  54 type_init(register_types);