4 * Copyright (C) 2019 Red Hat Inc
7 * Marc-André Lureau <marcandre.lureau@redhat.com>
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.
13 #include "qemu/osdep.h"
14 #include "qemu/units.h"
15 #include "qemu/dbus.h"
16 #include "qemu/error-report.h"
17 #include "qapi/error.h"
18 #include "qom/object_interfaces.h"
19 #include "qapi/qmp/qerror.h"
20 #include "migration/vmstate.h"
22 #include "qom/object.h"
25 #define TYPE_DBUS_VMSTATE "dbus-vmstate"
26 OBJECT_DECLARE_SIMPLE_TYPE(DBusVMState,
41 static const GDBusPropertyInfo vmstate_property_info[] = {
42 { -1, (char *) "Id", (char *) "s",
43 G_DBUS_PROPERTY_INFO_FLAGS_READABLE, NULL },
46 static const GDBusPropertyInfo * const vmstate_property_info_pointers[] = {
47 &vmstate_property_info[0],
51 static const GDBusInterfaceInfo vmstate1_interface_info = {
53 (char *) "org.qemu.VMState1",
54 (GDBusMethodInfo **) NULL,
55 (GDBusSignalInfo **) NULL,
56 (GDBusPropertyInfo **) &vmstate_property_info_pointers,
60 #define DBUS_VMSTATE_SIZE_LIMIT (1 * MiB)
63 get_id_list_set(DBusVMState *self)
65 g_auto(GStrv) ids = NULL;
66 g_autoptr(GHashTable) set = NULL;
73 ids = g_strsplit(self->id_list, ",", -1);
74 set = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
75 for (i = 0; ids[i]; i++) {
76 g_hash_table_add(set, ids[i]);
80 return g_steal_pointer(&set);
84 dbus_get_proxies(DBusVMState *self, GError **err)
86 g_autoptr(GHashTable) proxies = NULL;
87 g_autoptr(GHashTable) ids = NULL;
88 g_auto(GStrv) names = NULL;
92 ids = get_id_list_set(self);
93 proxies = g_hash_table_new_full(g_str_hash, g_str_equal,
94 g_free, g_object_unref);
96 names = qemu_dbus_get_queued_owners(self->bus, "org.qemu.VMState1", &error);
98 g_set_error(err, G_IO_ERROR, G_IO_ERROR_FAILED, "%s",
99 error_get_pretty(error));
104 for (i = 0; names[i]; i++) {
105 g_autoptr(GDBusProxy) proxy = NULL;
106 g_autoptr(GVariant) result = NULL;
107 g_autofree char *id = NULL;
110 proxy = g_dbus_proxy_new_sync(self->bus, G_DBUS_PROXY_FLAGS_NONE,
111 (GDBusInterfaceInfo *) &vmstate1_interface_info,
113 "/org/qemu/VMState1",
117 if (err != NULL && *err != NULL) {
118 warn_report("%s: Failed to create proxy: %s",
119 __func__, (*err)->message);
125 result = g_dbus_proxy_get_cached_property(proxy, "Id");
127 warn_report("%s: VMState Id property is missing.", __func__);
128 g_clear_object(&proxy);
132 id = g_variant_dup_string(result, &size);
133 if (ids && !g_hash_table_remove(ids, id)) {
134 g_clear_pointer(&id, g_free);
135 g_clear_object(&proxy);
138 if (size == 0 || size >= 256) {
139 g_set_error(err, G_IO_ERROR, G_IO_ERROR_FAILED,
140 "VMState Id '%s' is invalid.", id);
144 if (!g_hash_table_insert(proxies, id, proxy)) {
145 g_set_error(err, G_IO_ERROR, G_IO_ERROR_FAILED,
146 "Duplicated VMState Id '%s'", id);
152 g_clear_pointer(&result, g_variant_unref);
156 g_autofree char **left = NULL;
158 left = (char **)g_hash_table_get_keys_as_array(ids, NULL);
160 g_autofree char *leftids = g_strjoinv(",", left);
161 g_set_error(err, G_IO_ERROR, G_IO_ERROR_FAILED,
162 "Required VMState Id are missing: %s", leftids);
167 return g_steal_pointer(&proxies);
171 dbus_load_state_proxy(GDBusProxy *proxy, const uint8_t *data, size_t size)
173 g_autoptr(GError) err = NULL;
174 g_autoptr(GVariant) result = NULL;
175 g_autoptr(GVariant) value = NULL;
177 value = g_variant_new_fixed_array(G_VARIANT_TYPE_BYTE,
178 data, size, sizeof(char));
179 result = g_dbus_proxy_call_sync(proxy, "Load",
180 g_variant_new("(@ay)",
181 g_steal_pointer(&value)),
182 G_DBUS_CALL_FLAGS_NO_AUTO_START,
185 error_report("%s: Failed to Load: %s", __func__, err->message);
192 static int dbus_vmstate_post_load(void *opaque, int version_id)
194 DBusVMState *self = DBUS_VMSTATE(opaque);
195 g_autoptr(GInputStream) m = NULL;
196 g_autoptr(GDataInputStream) s = NULL;
197 g_autoptr(GError) err = NULL;
198 g_autoptr(GHashTable) proxies = NULL;
201 trace_dbus_vmstate_post_load(version_id);
203 proxies = dbus_get_proxies(self, &err);
205 error_report("%s: Failed to get proxies: %s", __func__, err->message);
209 m = g_memory_input_stream_new_from_data(self->data, self->data_size, NULL);
210 s = g_data_input_stream_new(m);
211 g_data_input_stream_set_byte_order(s, G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN);
212 g_buffered_input_stream_set_buffer_size(G_BUFFERED_INPUT_STREAM(s),
213 DBUS_VMSTATE_SIZE_LIMIT);
215 nelem = g_data_input_stream_read_uint32(s, NULL, &err);
221 GDBusProxy *proxy = NULL;
223 gsize bytes_read, avail;
226 len = g_data_input_stream_read_uint32(s, NULL, &err);
231 error_report("%s: Invalid DBus vmstate proxy name %u",
235 if (!g_input_stream_read_all(G_INPUT_STREAM(s), id, len,
236 &bytes_read, NULL, &err)) {
239 if (bytes_read != len) {
240 error_report("%s: Short read", __func__);
245 trace_dbus_vmstate_loading(id);
247 proxy = g_hash_table_lookup(proxies, id);
249 error_report("%s: Failed to find proxy Id '%s'", __func__, id);
253 len = g_data_input_stream_read_uint32(s, NULL, &err);
254 if (len > DBUS_VMSTATE_SIZE_LIMIT) {
255 error_report("%s: Invalid vmstate size: %u", __func__, len);
259 g_buffered_input_stream_fill(G_BUFFERED_INPUT_STREAM(s), len, NULL,
265 avail = g_buffered_input_stream_get_available(
266 G_BUFFERED_INPUT_STREAM(s));
268 error_report("%s: Not enough data available to load for Id: '%s'. "
269 "Available data size: %zu, Actual vmstate size: %u",
270 __func__, id, avail, len);
274 if (dbus_load_state_proxy(proxy,
275 g_buffered_input_stream_peek_buffer(G_BUFFERED_INPUT_STREAM(s),
278 error_report("%s: Failed to restore Id '%s'", __func__, id);
282 if (!g_seekable_seek(G_SEEKABLE(s), len, G_SEEK_CUR, NULL, &err)) {
292 error_report("%s: Failed to read from stream: %s", __func__, err->message);
297 dbus_save_state_proxy(gpointer key,
301 GDataOutputStream *s = user_data;
302 const char *id = key;
303 GDBusProxy *proxy = value;
304 g_autoptr(GVariant) result = NULL;
305 g_autoptr(GVariant) child = NULL;
306 g_autoptr(GError) err = NULL;
310 trace_dbus_vmstate_saving(id);
312 result = g_dbus_proxy_call_sync(proxy, "Save",
313 NULL, G_DBUS_CALL_FLAGS_NO_AUTO_START,
316 error_report("%s: Failed to Save: %s", __func__, err->message);
320 child = g_variant_get_child_value(result, 0);
321 data = g_variant_get_fixed_array(child, &size, sizeof(char));
323 error_report("%s: Failed to Save: not a byte array", __func__);
326 if (size > DBUS_VMSTATE_SIZE_LIMIT) {
327 error_report("%s: Too large vmstate data to save: %zu",
328 __func__, (size_t)size);
332 if (!g_data_output_stream_put_uint32(s, strlen(id), NULL, &err) ||
333 !g_data_output_stream_put_string(s, id, NULL, &err) ||
334 !g_data_output_stream_put_uint32(s, size, NULL, &err) ||
335 !g_output_stream_write_all(G_OUTPUT_STREAM(s),
336 data, size, NULL, NULL, &err)) {
337 error_report("%s: Failed to write to stream: %s",
338 __func__, err->message);
342 static int dbus_vmstate_pre_save(void *opaque)
344 DBusVMState *self = DBUS_VMSTATE(opaque);
345 g_autoptr(GOutputStream) m = NULL;
346 g_autoptr(GDataOutputStream) s = NULL;
347 g_autoptr(GHashTable) proxies = NULL;
348 g_autoptr(GError) err = NULL;
350 trace_dbus_vmstate_pre_save();
352 proxies = dbus_get_proxies(self, &err);
354 error_report("%s: Failed to get proxies: %s", __func__, err->message);
358 m = g_memory_output_stream_new_resizable();
359 s = g_data_output_stream_new(m);
360 g_data_output_stream_set_byte_order(s, G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN);
362 if (!g_data_output_stream_put_uint32(s, g_hash_table_size(proxies),
364 error_report("%s: Failed to write to stream: %s",
365 __func__, err->message);
369 g_hash_table_foreach(proxies, dbus_save_state_proxy, s);
371 if (g_memory_output_stream_get_size(G_MEMORY_OUTPUT_STREAM(m))
373 error_report("%s: DBus vmstate buffer is too large", __func__);
377 if (!g_output_stream_close(G_OUTPUT_STREAM(m), NULL, &err)) {
378 error_report("%s: Failed to close stream: %s", __func__, err->message);
384 g_memory_output_stream_get_size(G_MEMORY_OUTPUT_STREAM(m));
386 g_memory_output_stream_steal_data(G_MEMORY_OUTPUT_STREAM(m));
391 static const VMStateDescription dbus_vmstate = {
392 .name = TYPE_DBUS_VMSTATE,
394 .pre_save = dbus_vmstate_pre_save,
395 .post_load = dbus_vmstate_post_load,
396 .fields = (VMStateField[]) {
397 VMSTATE_UINT32(data_size, DBusVMState),
398 VMSTATE_VBUFFER_ALLOC_UINT32(data, DBusVMState, 0, 0, data_size),
399 VMSTATE_END_OF_LIST()
404 dbus_vmstate_complete(UserCreatable *uc, Error **errp)
406 DBusVMState *self = DBUS_VMSTATE(uc);
407 g_autoptr(GError) err = NULL;
409 if (!object_resolve_path_type("", TYPE_DBUS_VMSTATE, NULL)) {
410 error_setg(errp, "There is already an instance of %s",
415 if (!self->dbus_addr) {
416 error_setg(errp, QERR_MISSING_PARAMETER, "addr");
420 self->bus = g_dbus_connection_new_for_address_sync(self->dbus_addr,
421 G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
422 G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
425 error_setg(errp, "failed to connect to DBus: '%s'", err->message);
429 if (vmstate_register_any(VMSTATE_IF(self), &dbus_vmstate, self) < 0) {
430 error_setg(errp, "Failed to register vmstate");
435 dbus_vmstate_finalize(Object *o)
437 DBusVMState *self = DBUS_VMSTATE(o);
439 vmstate_unregister(VMSTATE_IF(self), &dbus_vmstate, self);
441 g_clear_object(&self->bus);
442 g_free(self->dbus_addr);
443 g_free(self->id_list);
448 get_dbus_addr(Object *o, Error **errp)
450 DBusVMState *self = DBUS_VMSTATE(o);
452 return g_strdup(self->dbus_addr);
456 set_dbus_addr(Object *o, const char *str, Error **errp)
458 DBusVMState *self = DBUS_VMSTATE(o);
460 g_free(self->dbus_addr);
461 self->dbus_addr = g_strdup(str);
465 get_id_list(Object *o, Error **errp)
467 DBusVMState *self = DBUS_VMSTATE(o);
469 return g_strdup(self->id_list);
473 set_id_list(Object *o, const char *str, Error **errp)
475 DBusVMState *self = DBUS_VMSTATE(o);
477 g_free(self->id_list);
478 self->id_list = g_strdup(str);
482 dbus_vmstate_get_id(VMStateIf *vmif)
484 return g_strdup(TYPE_DBUS_VMSTATE);
488 dbus_vmstate_class_init(ObjectClass *oc, void *data)
490 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
491 VMStateIfClass *vc = VMSTATE_IF_CLASS(oc);
493 ucc->complete = dbus_vmstate_complete;
494 vc->get_id = dbus_vmstate_get_id;
496 object_class_property_add_str(oc, "addr",
497 get_dbus_addr, set_dbus_addr);
498 object_class_property_add_str(oc, "id-list",
499 get_id_list, set_id_list);
502 static const TypeInfo dbus_vmstate_info = {
503 .name = TYPE_DBUS_VMSTATE,
504 .parent = TYPE_OBJECT,
505 .instance_size = sizeof(DBusVMState),
506 .instance_finalize = dbus_vmstate_finalize,
507 .class_init = dbus_vmstate_class_init,
508 .interfaces = (InterfaceInfo[]) {
509 { TYPE_USER_CREATABLE },
518 type_register_static(&dbus_vmstate_info);
521 type_init(register_types);