root / migration.c @ 7267c094
History | View | Annotate | Download (12.2 kB)
1 |
/*
|
---|---|
2 |
* QEMU live migration
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2008
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
10 |
* the COPYING file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
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" |
23 |
|
24 |
//#define DEBUG_MIGRATION
|
25 |
|
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
|
33 |
|
34 |
/* Migration speed throttling */
|
35 |
static int64_t max_throttle = (32 << 20); |
36 |
|
37 |
static MigrationState *current_migration;
|
38 |
|
39 |
static NotifierList migration_state_notifiers =
|
40 |
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); |
41 |
|
42 |
int qemu_start_incoming_migration(const char *uri) |
43 |
{ |
44 |
const char *p; |
45 |
int ret;
|
46 |
|
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; |
60 |
} |
61 |
return ret;
|
62 |
} |
63 |
|
64 |
void process_incoming_migration(QEMUFile *f)
|
65 |
{ |
66 |
if (qemu_loadvm_state(f) < 0) { |
67 |
fprintf(stderr, "load of migration failed\n");
|
68 |
exit(0);
|
69 |
} |
70 |
qemu_announce_self(); |
71 |
DPRINTF("successfully loaded vm state\n");
|
72 |
|
73 |
incoming_expected = false;
|
74 |
|
75 |
if (autostart)
|
76 |
vm_start(); |
77 |
} |
78 |
|
79 |
int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data) |
80 |
{ |
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"); |
87 |
|
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; |
92 |
} |
93 |
|
94 |
if (qemu_savevm_state_blocked(mon)) {
|
95 |
return -1; |
96 |
} |
97 |
|
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; |
115 |
} |
116 |
|
117 |
if (s == NULL) { |
118 |
monitor_printf(mon, "migration failed\n");
|
119 |
return -1; |
120 |
} |
121 |
|
122 |
if (current_migration) {
|
123 |
current_migration->release(current_migration); |
124 |
} |
125 |
|
126 |
current_migration = s; |
127 |
notifier_list_notify(&migration_state_notifiers, NULL);
|
128 |
return 0; |
129 |
} |
130 |
|
131 |
int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data) |
132 |
{ |
133 |
MigrationState *s = current_migration; |
134 |
|
135 |
if (s)
|
136 |
s->cancel(s); |
137 |
|
138 |
return 0; |
139 |
} |
140 |
|
141 |
int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data) |
142 |
{ |
143 |
int64_t d; |
144 |
FdMigrationState *s; |
145 |
|
146 |
d = qdict_get_int(qdict, "value");
|
147 |
if (d < 0) { |
148 |
d = 0;
|
149 |
} |
150 |
max_throttle = d; |
151 |
|
152 |
s = migrate_to_fms(current_migration); |
153 |
if (s && s->file) {
|
154 |
qemu_file_set_rate_limit(s->file, max_throttle); |
155 |
} |
156 |
|
157 |
return 0; |
158 |
} |
159 |
|
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; |
165 |
|
166 |
uint64_t migrate_max_downtime(void)
|
167 |
{ |
168 |
return max_downtime;
|
169 |
} |
170 |
|
171 |
int do_migrate_set_downtime(Monitor *mon, const QDict *qdict, |
172 |
QObject **ret_data) |
173 |
{ |
174 |
double d;
|
175 |
|
176 |
d = qdict_get_double(qdict, "value") * 1e9; |
177 |
d = MAX(0, MIN(UINT64_MAX, d));
|
178 |
max_downtime = (uint64_t)d; |
179 |
|
180 |
return 0; |
181 |
} |
182 |
|
183 |
static void migrate_print_status(Monitor *mon, const char *name, |
184 |
const QDict *status_dict)
|
185 |
{ |
186 |
QDict *qdict; |
187 |
|
188 |
qdict = qobject_to_qdict(qdict_get(status_dict, name)); |
189 |
|
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); |
196 |
} |
197 |
|
198 |
void do_info_migrate_print(Monitor *mon, const QObject *data) |
199 |
{ |
200 |
QDict *qdict; |
201 |
|
202 |
qdict = qobject_to_qdict(data); |
203 |
|
204 |
monitor_printf(mon, "Migration status: %s\n",
|
205 |
qdict_get_str(qdict, "status"));
|
206 |
|
207 |
if (qdict_haskey(qdict, "ram")) { |
208 |
migrate_print_status(mon, "ram", qdict);
|
209 |
} |
210 |
|
211 |
if (qdict_haskey(qdict, "disk")) { |
212 |
migrate_print_status(mon, "disk", qdict);
|
213 |
} |
214 |
} |
215 |
|
216 |
static void migrate_put_status(QDict *qdict, const char *name, |
217 |
uint64_t trans, uint64_t rem, uint64_t total) |
218 |
{ |
219 |
QObject *obj; |
220 |
|
221 |
obj = qobject_from_jsonf("{ 'transferred': %" PRId64 ", " |
222 |
"'remaining': %" PRId64 ", " |
223 |
"'total': %" PRId64 " }", trans, rem, total); |
224 |
qdict_put_obj(qdict, name, obj); |
225 |
} |
226 |
|
227 |
void do_info_migrate(Monitor *mon, QObject **ret_data)
|
228 |
{ |
229 |
QDict *qdict; |
230 |
MigrationState *s = current_migration; |
231 |
|
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")); |
237 |
|
238 |
migrate_put_status(qdict, "ram", ram_bytes_transferred(),
|
239 |
ram_bytes_remaining(), ram_bytes_total()); |
240 |
|
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()); |
245 |
} |
246 |
|
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;
|
258 |
} |
259 |
} |
260 |
} |
261 |
|
262 |
/* shared migration helpers */
|
263 |
|
264 |
void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
|
265 |
{ |
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");
|
272 |
} |
273 |
} |
274 |
|
275 |
void migrate_fd_error(FdMigrationState *s)
|
276 |
{ |
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); |
281 |
} |
282 |
|
283 |
int migrate_fd_cleanup(FdMigrationState *s)
|
284 |
{ |
285 |
int ret = 0; |
286 |
|
287 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
288 |
|
289 |
if (s->file) {
|
290 |
DPRINTF("closing file\n");
|
291 |
if (qemu_fclose(s->file) != 0) { |
292 |
ret = -1;
|
293 |
} |
294 |
s->file = NULL;
|
295 |
} else {
|
296 |
if (s->mon) {
|
297 |
monitor_resume(s->mon); |
298 |
} |
299 |
} |
300 |
|
301 |
if (s->fd != -1) { |
302 |
close(s->fd); |
303 |
s->fd = -1;
|
304 |
} |
305 |
|
306 |
return ret;
|
307 |
} |
308 |
|
309 |
void migrate_fd_put_notify(void *opaque) |
310 |
{ |
311 |
FdMigrationState *s = opaque; |
312 |
|
313 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
314 |
qemu_file_put_notify(s->file); |
315 |
} |
316 |
|
317 |
ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size) |
318 |
{ |
319 |
FdMigrationState *s = opaque; |
320 |
ssize_t ret; |
321 |
|
322 |
do {
|
323 |
ret = s->write(s, data, size); |
324 |
} while (ret == -1 && ((s->get_error(s)) == EINTR)); |
325 |
|
326 |
if (ret == -1) |
327 |
ret = -(s->get_error(s)); |
328 |
|
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);
|
334 |
} |
335 |
|
336 |
return ret;
|
337 |
} |
338 |
|
339 |
void migrate_fd_connect(FdMigrationState *s)
|
340 |
{ |
341 |
int ret;
|
342 |
|
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); |
349 |
|
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;
|
357 |
} |
358 |
|
359 |
migrate_fd_put_ready(s); |
360 |
} |
361 |
|
362 |
void migrate_fd_put_ready(void *opaque) |
363 |
{ |
364 |
FdMigrationState *s = opaque; |
365 |
|
366 |
if (s->state != MIG_STATE_ACTIVE) {
|
367 |
DPRINTF("put_ready returning because of non-active state\n");
|
368 |
return;
|
369 |
} |
370 |
|
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;
|
375 |
|
376 |
DPRINTF("done iterating\n");
|
377 |
vm_stop(VMSTOP_MIGRATE); |
378 |
|
379 |
if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) { |
380 |
if (old_vm_running) {
|
381 |
vm_start(); |
382 |
} |
383 |
state = MIG_STATE_ERROR; |
384 |
} else {
|
385 |
state = MIG_STATE_COMPLETED; |
386 |
} |
387 |
if (migrate_fd_cleanup(s) < 0) { |
388 |
if (old_vm_running) {
|
389 |
vm_start(); |
390 |
} |
391 |
state = MIG_STATE_ERROR; |
392 |
} |
393 |
s->state = state; |
394 |
notifier_list_notify(&migration_state_notifiers, NULL);
|
395 |
} |
396 |
} |
397 |
|
398 |
int migrate_fd_get_status(MigrationState *mig_state)
|
399 |
{ |
400 |
FdMigrationState *s = migrate_to_fms(mig_state); |
401 |
return s->state;
|
402 |
} |
403 |
|
404 |
void migrate_fd_cancel(MigrationState *mig_state)
|
405 |
{ |
406 |
FdMigrationState *s = migrate_to_fms(mig_state); |
407 |
|
408 |
if (s->state != MIG_STATE_ACTIVE)
|
409 |
return;
|
410 |
|
411 |
DPRINTF("cancelling migration\n");
|
412 |
|
413 |
s->state = MIG_STATE_CANCELLED; |
414 |
notifier_list_notify(&migration_state_notifiers, NULL);
|
415 |
qemu_savevm_state_cancel(s->mon, s->file); |
416 |
|
417 |
migrate_fd_cleanup(s); |
418 |
} |
419 |
|
420 |
void migrate_fd_release(MigrationState *mig_state)
|
421 |
{ |
422 |
FdMigrationState *s = migrate_to_fms(mig_state); |
423 |
|
424 |
DPRINTF("releasing state\n");
|
425 |
|
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); |
430 |
} |
431 |
g_free(s); |
432 |
} |
433 |
|
434 |
void migrate_fd_wait_for_unfreeze(void *opaque) |
435 |
{ |
436 |
FdMigrationState *s = opaque; |
437 |
int ret;
|
438 |
|
439 |
DPRINTF("wait for unfreeze\n");
|
440 |
if (s->state != MIG_STATE_ACTIVE)
|
441 |
return;
|
442 |
|
443 |
do {
|
444 |
fd_set wfds; |
445 |
|
446 |
FD_ZERO(&wfds); |
447 |
FD_SET(s->fd, &wfds); |
448 |
|
449 |
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); |
450 |
} while (ret == -1 && (s->get_error(s)) == EINTR); |
451 |
} |
452 |
|
453 |
int migrate_fd_close(void *opaque) |
454 |
{ |
455 |
FdMigrationState *s = opaque; |
456 |
|
457 |
if (s->mon) {
|
458 |
monitor_resume(s->mon); |
459 |
} |
460 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
461 |
return s->close(s);
|
462 |
} |
463 |
|
464 |
void add_migration_state_change_notifier(Notifier *notify)
|
465 |
{ |
466 |
notifier_list_add(&migration_state_notifiers, notify); |
467 |
} |
468 |
|
469 |
void remove_migration_state_change_notifier(Notifier *notify)
|
470 |
{ |
471 |
notifier_list_remove(&migration_state_notifiers, notify); |
472 |
} |
473 |
|
474 |
int get_migration_state(void) |
475 |
{ |
476 |
if (current_migration) {
|
477 |
return migrate_fd_get_status(current_migration);
|
478 |
} else {
|
479 |
return MIG_STATE_ERROR;
|
480 |
} |
481 |
} |