Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20211016' into staging
[qemu.git] / 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 void
20 ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
21 {
22 uint32_t ram_flags;
23 char *name;
24
25 if (!backend->size) {
26 error_setg(errp, "can't create backend with size 0");
27 return;
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 memory_region_init_ram_flags_nomigrate(&backend->mr, OBJECT(backend), name,
34 backend->size, ram_flags, errp);
35 g_free(name);
36 }
37
38 static void
39 ram_backend_class_init(ObjectClass *oc, void *data)
40 {
41 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
42
43 bc->alloc = ram_backend_memory_alloc;
44 }
45
46 static const TypeInfo ram_backend_info = {
47 .name = TYPE_MEMORY_BACKEND_RAM,
48 .parent = TYPE_MEMORY_BACKEND,
49 .class_init = ram_backend_class_init,
50 };
51
52 static void register_types(void)
53 {
54 type_register_static(&ram_backend_info);
55 }
56
57 type_init(register_types);