stubs: Move qemu_timer_notify_cb() and remove qemu_notify_event() stub
[qemu.git] / backends / hostmem-file.c
1 /*
2 * QEMU Host Memory Backend for hugetlbfs
3 *
4 * Copyright (C) 2013-2014 Red Hat Inc
5 *
6 * Authors:
7 * Paolo Bonzini <pbonzini@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 "qapi/error.h"
15 #include "qemu/error-report.h"
16 #include "qemu/module.h"
17 #include "sysemu/hostmem.h"
18 #include "sysemu/sysemu.h"
19 #include "qom/object_interfaces.h"
20
21 #define MEMORY_BACKEND_FILE(obj) \
22 OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE)
23
24 typedef struct HostMemoryBackendFile HostMemoryBackendFile;
25
26 struct HostMemoryBackendFile {
27 HostMemoryBackend parent_obj;
28
29 char *mem_path;
30 uint64_t align;
31 bool discard_data;
32 bool is_pmem;
33 };
34
35 static void
36 file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
37 {
38 #ifndef CONFIG_POSIX
39 error_setg(errp, "backend '%s' not supported on this host",
40 object_get_typename(OBJECT(backend)));
41 #else
42 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
43 gchar *name;
44
45 if (!backend->size) {
46 error_setg(errp, "can't create backend with size 0");
47 return;
48 }
49 if (!fb->mem_path) {
50 error_setg(errp, "mem-path property not set");
51 return;
52 }
53
54 name = host_memory_backend_get_name(backend);
55 memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
56 name,
57 backend->size, fb->align,
58 (backend->share ? RAM_SHARED : 0) |
59 (fb->is_pmem ? RAM_PMEM : 0),
60 fb->mem_path, errp);
61 g_free(name);
62 #endif
63 }
64
65 static char *get_mem_path(Object *o, Error **errp)
66 {
67 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
68
69 return g_strdup(fb->mem_path);
70 }
71
72 static void set_mem_path(Object *o, const char *str, Error **errp)
73 {
74 HostMemoryBackend *backend = MEMORY_BACKEND(o);
75 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
76
77 if (host_memory_backend_mr_inited(backend)) {
78 error_setg(errp, "cannot change property 'mem-path' of %s",
79 object_get_typename(o));
80 return;
81 }
82 g_free(fb->mem_path);
83 fb->mem_path = g_strdup(str);
84 }
85
86 static bool file_memory_backend_get_discard_data(Object *o, Error **errp)
87 {
88 return MEMORY_BACKEND_FILE(o)->discard_data;
89 }
90
91 static void file_memory_backend_set_discard_data(Object *o, bool value,
92 Error **errp)
93 {
94 MEMORY_BACKEND_FILE(o)->discard_data = value;
95 }
96
97 static void file_memory_backend_get_align(Object *o, Visitor *v,
98 const char *name, void *opaque,
99 Error **errp)
100 {
101 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
102 uint64_t val = fb->align;
103
104 visit_type_size(v, name, &val, errp);
105 }
106
107 static void file_memory_backend_set_align(Object *o, Visitor *v,
108 const char *name, void *opaque,
109 Error **errp)
110 {
111 HostMemoryBackend *backend = MEMORY_BACKEND(o);
112 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
113 uint64_t val;
114
115 if (host_memory_backend_mr_inited(backend)) {
116 error_setg(errp, "cannot change property '%s' of %s", name,
117 object_get_typename(o));
118 return;
119 }
120
121 if (!visit_type_size(v, name, &val, errp)) {
122 return;
123 }
124 fb->align = val;
125 }
126
127 static bool file_memory_backend_get_pmem(Object *o, Error **errp)
128 {
129 return MEMORY_BACKEND_FILE(o)->is_pmem;
130 }
131
132 static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp)
133 {
134 HostMemoryBackend *backend = MEMORY_BACKEND(o);
135 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
136
137 if (host_memory_backend_mr_inited(backend)) {
138 error_setg(errp, "cannot change property 'pmem' of %s.",
139 object_get_typename(o));
140 return;
141 }
142
143 #ifndef CONFIG_LIBPMEM
144 if (value) {
145 error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'"
146 " of %s. We can't ensure data persistence.",
147 object_get_typename(o));
148 return;
149 }
150 #endif
151
152 fb->is_pmem = value;
153 }
154
155 static void file_backend_unparent(Object *obj)
156 {
157 HostMemoryBackend *backend = MEMORY_BACKEND(obj);
158 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj);
159
160 if (host_memory_backend_mr_inited(backend) && fb->discard_data) {
161 void *ptr = memory_region_get_ram_ptr(&backend->mr);
162 uint64_t sz = memory_region_size(&backend->mr);
163
164 qemu_madvise(ptr, sz, QEMU_MADV_REMOVE);
165 }
166 }
167
168 static void
169 file_backend_class_init(ObjectClass *oc, void *data)
170 {
171 HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
172
173 bc->alloc = file_backend_memory_alloc;
174 oc->unparent = file_backend_unparent;
175
176 object_class_property_add_bool(oc, "discard-data",
177 file_memory_backend_get_discard_data, file_memory_backend_set_discard_data);
178 object_class_property_add_str(oc, "mem-path",
179 get_mem_path, set_mem_path);
180 object_class_property_add(oc, "align", "int",
181 file_memory_backend_get_align,
182 file_memory_backend_set_align,
183 NULL, NULL);
184 object_class_property_add_bool(oc, "pmem",
185 file_memory_backend_get_pmem, file_memory_backend_set_pmem);
186 }
187
188 static void file_backend_instance_finalize(Object *o)
189 {
190 HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
191
192 g_free(fb->mem_path);
193 }
194
195 static const TypeInfo file_backend_info = {
196 .name = TYPE_MEMORY_BACKEND_FILE,
197 .parent = TYPE_MEMORY_BACKEND,
198 .class_init = file_backend_class_init,
199 .instance_finalize = file_backend_instance_finalize,
200 .instance_size = sizeof(HostMemoryBackendFile),
201 };
202
203 static void register_types(void)
204 {
205 type_register_static(&file_backend_info);
206 }
207
208 type_init(register_types);