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
  13 #include "qemu/osdep.h"
  14 #include "sysemu/hostmem.h"
  15 #include "qapi/error.h"
  16 #include "qemu/module.h"
  17 #include "qom/object_interfaces.h"
  18
  19 static bool
  20 ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
  21 {
  22     g_autofree char *name = NULL;
  23     uint32_t ram_flags;
  24
  25     if (!backend->size) {
  26         error_setg(errp, "can't create backend with size 0");
  27         return false;
  28     }
  29
  30     name = host_memory_backend_get_name(backend);
  31     ram_flags = backend->share ? RAM_SHARED : 0;
  32     ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
  33     ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0;
  34     return memory_region_init_ram_flags_nomigrate(&backend->mr, OBJECT(backend),
  35                                                   name, backend->size,
  36                                                   ram_flags, errp);
  37 }
  38
  39 static void
  40 ram_backend_class_init(ObjectClass *oc, void *data)
  41 {
  42     HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
  43
  44     bc->alloc = ram_backend_memory_alloc;
  45 }
  46
  47 static const TypeInfo ram_backend_info = {
  48     .name = TYPE_MEMORY_BACKEND_RAM,
  49     .parent = TYPE_MEMORY_BACKEND,
  50     .class_init = ram_backend_class_init,
  51 };
  52
  53 static void register_types(void)
  54 {
  55     type_register_static(&ram_backend_info);
  56 }
  57
  58 type_init(register_types);