target-xtensa: add target to the configure script
[qemu.git] / migration.c
blobf5959b4391712972373dd18fc77d847cc05d1826
1 /*
2 * QEMU live migration
4 * Copyright IBM, Corp. 2008
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "qemu-common.h"
15 #include "migration.h"
16 #include "monitor.h"
17 #include "buffered_file.h"
18 #include "sysemu.h"
19 #include "block.h"
20 #include "qemu_socket.h"
21 #include "block-migration.h"
22 #include "qemu-objects.h"
24 //#define DEBUG_MIGRATION
26 #ifdef DEBUG_MIGRATION
27 #define DPRINTF(fmt, ...) \
28 do { printf("migration: " fmt, ## __VA_ARGS__); } while (0)
29 #else
30 #define DPRINTF(fmt, ...) \
31 do { } while (0)
32 #endif
34 /* Migration speed throttling */
35 static int64_t max_throttle = (32 << 20);
37 static MigrationState *current_migration;
39 static NotifierList migration_state_notifiers =
40 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
42 int qemu_start_incoming_migration(const char *uri)
44 const char *p;
45 int ret;
47 if (strstart(uri, "tcp:", &p))
48 ret = tcp_start_incoming_migration(p);
49 #if !defined(WIN32)
50 else if (strstart(uri, "exec:", &p))
51 ret = exec_start_incoming_migration(p);
52 else if (strstart(uri, "unix:", &p))
53 ret = unix_start_incoming_migration(p);
54 else if (strstart(uri, "fd:", &p))
55 ret = fd_start_incoming_migration(p);
56 #endif
57 else {
58 fprintf(stderr, "unknown migration protocol: %s\n", uri);
59 ret = -EPROTONOSUPPORT;
61 return ret;
64 void process_incoming_migration(QEMUFile *f)
66 if (qemu_loadvm_state(f) < 0) {
67 fprintf(stderr, "load of migration failed\n");
68 exit(0);
70 qemu_announce_self();
71 DPRINTF("successfully loaded vm state\n");
73 incoming_expected = false;
75 if (autostart)
76 vm_start();
79 int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
81 MigrationState *s = NULL;
82 const char *p;
83 int detach = qdict_get_try_bool(qdict, "detach", 0);
84 int blk = qdict_get_try_bool(qdict, "blk", 0);
85 int inc = qdict_get_try_bool(qdict, "inc", 0);
86 const char *uri = qdict_get_str(qdict, "uri");
88 if (current_migration &&
89 current_migration->get_status(current_migration) == MIG_STATE_ACTIVE) {
90 monitor_printf(mon, "migration already in progress\n");
91 return -1;
94 if (qemu_savevm_state_blocked(mon)) {
95 return -1;
98 if (strstart(uri, "tcp:", &p)) {
99 s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
100 blk, inc);
101 #if !defined(WIN32)
102 } else if (strstart(uri, "exec:", &p)) {
103 s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
104 blk, inc);
105 } else if (strstart(uri, "unix:", &p)) {
106 s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
107 blk, inc);
108 } else if (strstart(uri, "fd:", &p)) {
109 s = fd_start_outgoing_migration(mon, p, max_throttle, detach,
110 blk, inc);
111 #endif
112 } else {
113 monitor_printf(mon, "unknown migration protocol: %s\n", uri);
114 return -1;
117 if (s == NULL) {
118 monitor_printf(mon, "migration failed\n");
119 return -1;
122 if (current_migration) {
123 current_migration->release(current_migration);
126 current_migration = s;
127 notifier_list_notify(&migration_state_notifiers, NULL);
128 return 0;
131 int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
133 MigrationState *s = current_migration;
135 if (s)
136 s->cancel(s);
138 return 0;
141 int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
143 int64_t d;
144 FdMigrationState *s;
146 d = qdict_get_int(qdict, "value");
147 if (d < 0) {
148 d = 0;
150 max_throttle = d;
152 s = migrate_to_fms(current_migration);
153 if (s && s->file) {
154 qemu_file_set_rate_limit(s->file, max_throttle);
157 return 0;
160 /* amount of nanoseconds we are willing to wait for migration to be down.
161 * the choice of nanoseconds is because it is the maximum resolution that
162 * get_clock() can achieve. It is an internal measure. All user-visible
163 * units must be in seconds */
164 static uint64_t max_downtime = 30000000;
166 uint64_t migrate_max_downtime(void)
168 return max_downtime;
171 int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
172 QObject **ret_data)
174 double d;
176 d = qdict_get_double(qdict, "value") * 1e9;
177 d = MAX(0, MIN(UINT64_MAX, d));
178 max_downtime = (uint64_t)d;
180 return 0;
183 static void migrate_print_status(Monitor *mon, const char *name,
184 const QDict *status_dict)
186 QDict *qdict;
188 qdict = qobject_to_qdict(qdict_get(status_dict, name));
190 monitor_printf(mon, "transferred %s: %" PRIu64 " kbytes\n", name,
191 qdict_get_int(qdict, "transferred") >> 10);
192 monitor_printf(mon, "remaining %s: %" PRIu64 " kbytes\n", name,
193 qdict_get_int(qdict, "remaining") >> 10);
194 monitor_printf(mon, "total %s: %" PRIu64 " kbytes\n", name,
195 qdict_get_int(qdict, "total") >> 10);
198 void do_info_migrate_print(Monitor *mon, const QObject *data)
200 QDict *qdict;
202 qdict = qobject_to_qdict(data);
204 monitor_printf(mon, "Migration status: %s\n",
205 qdict_get_str(qdict, "status"));
207 if (qdict_haskey(qdict, "ram")) {
208 migrate_print_status(mon, "ram", qdict);
211 if (qdict_haskey(qdict, "disk")) {
212 migrate_print_status(mon, "disk", qdict);
216 static void migrate_put_status(QDict *qdict, const char *name,
217 uint64_t trans, uint64_t rem, uint64_t total)
219 QObject *obj;
221 obj = qobject_from_jsonf("{ 'transferred': %" PRId64 ", "
222 "'remaining': %" PRId64 ", "
223 "'total': %" PRId64 " }", trans, rem, total);
224 qdict_put_obj(qdict, name, obj);
227 void do_info_migrate(Monitor *mon, QObject **ret_data)
229 QDict *qdict;
230 MigrationState *s = current_migration;
232 if (s) {
233 switch (s->get_status(s)) {
234 case MIG_STATE_ACTIVE:
235 qdict = qdict_new();
236 qdict_put(qdict, "status", qstring_from_str("active"));
238 migrate_put_status(qdict, "ram", ram_bytes_transferred(),
239 ram_bytes_remaining(), ram_bytes_total());
241 if (blk_mig_active()) {
242 migrate_put_status(qdict, "disk", blk_mig_bytes_transferred(),
243 blk_mig_bytes_remaining(),
244 blk_mig_bytes_total());
247 *ret_data = QOBJECT(qdict);
248 break;
249 case MIG_STATE_COMPLETED:
250 *ret_data = qobject_from_jsonf("{ 'status': 'completed' }");
251 break;
252 case MIG_STATE_ERROR:
253 *ret_data = qobject_from_jsonf("{ 'status': 'failed' }");
254 break;
255 case MIG_STATE_CANCELLED:
256 *ret_data = qobject_from_jsonf("{ 'status': 'cancelled' }");
257 break;
262 /* shared migration helpers */
264 void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
266 s->mon = mon;
267 if (monitor_suspend(mon) == 0) {
268 DPRINTF("suspending monitor\n");
269 } else {
270 monitor_printf(mon, "terminal does not allow synchronous "
271 "migration, continuing detached\n");
275 void migrate_fd_error(FdMigrationState *s)
277 DPRINTF("setting error state\n");
278 s->state = MIG_STATE_ERROR;
279 notifier_list_notify(&migration_state_notifiers, NULL);
280 migrate_fd_cleanup(s);
283 int migrate_fd_cleanup(FdMigrationState *s)
285 int ret = 0;
287 qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
289 if (s->file) {
290 DPRINTF("closing file\n");
291 if (qemu_fclose(s->file) != 0) {
292 ret = -1;
294 s->file = NULL;
295 } else {
296 if (s->mon) {
297 monitor_resume(s->mon);
301 if (s->fd != -1) {
302 close(s->fd);
303 s->fd = -1;
306 return ret;
309 void migrate_fd_put_notify(void *opaque)
311 FdMigrationState *s = opaque;
313 qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
314 qemu_file_put_notify(s->file);
317 ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
319 FdMigrationState *s = opaque;
320 ssize_t ret;
322 do {
323 ret = s->write(s, data, size);
324 } while (ret == -1 && ((s->get_error(s)) == EINTR));
326 if (ret == -1)
327 ret = -(s->get_error(s));
329 if (ret == -EAGAIN) {
330 qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
331 } else if (ret < 0) {
332 s->state = MIG_STATE_ERROR;
333 notifier_list_notify(&migration_state_notifiers, NULL);
336 return ret;
339 void migrate_fd_connect(FdMigrationState *s)
341 int ret;
343 s->file = qemu_fopen_ops_buffered(s,
344 s->bandwidth_limit,
345 migrate_fd_put_buffer,
346 migrate_fd_put_ready,
347 migrate_fd_wait_for_unfreeze,
348 migrate_fd_close);
350 DPRINTF("beginning savevm\n");
351 ret = qemu_savevm_state_begin(s->mon, s->file, s->mig_state.blk,
352 s->mig_state.shared);
353 if (ret < 0) {
354 DPRINTF("failed, %d\n", ret);
355 migrate_fd_error(s);
356 return;
359 migrate_fd_put_ready(s);
362 void migrate_fd_put_ready(void *opaque)
364 FdMigrationState *s = opaque;
366 if (s->state != MIG_STATE_ACTIVE) {
367 DPRINTF("put_ready returning because of non-active state\n");
368 return;
371 DPRINTF("iterate\n");
372 if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
373 int state;
374 int old_vm_running = vm_running;
376 DPRINTF("done iterating\n");
377 vm_stop(VMSTOP_MIGRATE);
379 if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
380 if (old_vm_running) {
381 vm_start();
383 state = MIG_STATE_ERROR;
384 } else {
385 state = MIG_STATE_COMPLETED;
387 if (migrate_fd_cleanup(s) < 0) {
388 if (old_vm_running) {
389 vm_start();
391 state = MIG_STATE_ERROR;
393 s->state = state;
394 notifier_list_notify(&migration_state_notifiers, NULL);
398 int migrate_fd_get_status(MigrationState *mig_state)
400 FdMigrationState *s = migrate_to_fms(mig_state);
401 return s->state;
404 void migrate_fd_cancel(MigrationState *mig_state)
406 FdMigrationState *s = migrate_to_fms(mig_state);
408 if (s->state != MIG_STATE_ACTIVE)
409 return;
411 DPRINTF("cancelling migration\n");
413 s->state = MIG_STATE_CANCELLED;
414 notifier_list_notify(&migration_state_notifiers, NULL);
415 qemu_savevm_state_cancel(s->mon, s->file);
417 migrate_fd_cleanup(s);
420 void migrate_fd_release(MigrationState *mig_state)
422 FdMigrationState *s = migrate_to_fms(mig_state);
424 DPRINTF("releasing state\n");
426 if (s->state == MIG_STATE_ACTIVE) {
427 s->state = MIG_STATE_CANCELLED;
428 notifier_list_notify(&migration_state_notifiers, NULL);
429 migrate_fd_cleanup(s);
431 g_free(s);
434 void migrate_fd_wait_for_unfreeze(void *opaque)
436 FdMigrationState *s = opaque;
437 int ret;
439 DPRINTF("wait for unfreeze\n");
440 if (s->state != MIG_STATE_ACTIVE)
441 return;
443 do {
444 fd_set wfds;
446 FD_ZERO(&wfds);
447 FD_SET(s->fd, &wfds);
449 ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
450 } while (ret == -1 && (s->get_error(s)) == EINTR);
453 int migrate_fd_close(void *opaque)
455 FdMigrationState *s = opaque;
457 if (s->mon) {
458 monitor_resume(s->mon);
460 qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
461 return s->close(s);
464 void add_migration_state_change_notifier(Notifier *notify)
466 notifier_list_add(&migration_state_notifiers, notify);
469 void remove_migration_state_change_notifier(Notifier *notify)
471 notifier_list_remove(&migration_state_notifiers, notify);
474 int get_migration_state(void)
476 if (current_migration) {
477 return migrate_fd_get_status(current_migration);
478 } else {
479 return MIG_STATE_ERROR;