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
ram_backend_memory_alloc(HostMemoryBackend * backend,Error ** errp)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
ram_backend_class_init(ObjectClass * oc,void * data)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
register_types(void)53 static void register_types(void)
54 {
55 type_register_static(&ram_backend_info);
56 }
57
58 type_init(register_types);
59