root / migration.c @ ef845c3b
History | View | Annotate | Download (8.4 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 |
|
22 |
//#define DEBUG_MIGRATION
|
23 |
|
24 |
#ifdef DEBUG_MIGRATION
|
25 |
#define dprintf(fmt, ...) \
|
26 |
do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
27 |
#else
|
28 |
#define dprintf(fmt, ...) \
|
29 |
do { } while (0) |
30 |
#endif
|
31 |
|
32 |
/* Migration speed throttling */
|
33 |
static uint32_t max_throttle = (32 << 20); |
34 |
|
35 |
static MigrationState *current_migration;
|
36 |
|
37 |
void qemu_start_incoming_migration(const char *uri) |
38 |
{ |
39 |
const char *p; |
40 |
|
41 |
if (strstart(uri, "tcp:", &p)) |
42 |
tcp_start_incoming_migration(p); |
43 |
#if !defined(WIN32)
|
44 |
else if (strstart(uri, "exec:", &p)) |
45 |
exec_start_incoming_migration(p); |
46 |
else if (strstart(uri, "unix:", &p)) |
47 |
unix_start_incoming_migration(p); |
48 |
else if (strstart(uri, "fd:", &p)) |
49 |
fd_start_incoming_migration(p); |
50 |
#endif
|
51 |
else
|
52 |
fprintf(stderr, "unknown migration protocol: %s\n", uri);
|
53 |
} |
54 |
|
55 |
void do_migrate(Monitor *mon, const QDict *qdict) |
56 |
{ |
57 |
MigrationState *s = NULL;
|
58 |
const char *p; |
59 |
int detach = qdict_get_int(qdict, "detach"); |
60 |
const char *uri = qdict_get_str(qdict, "uri"); |
61 |
|
62 |
if (strstart(uri, "tcp:", &p)) |
63 |
s = tcp_start_outgoing_migration(p, max_throttle, detach); |
64 |
#if !defined(WIN32)
|
65 |
else if (strstart(uri, "exec:", &p)) |
66 |
s = exec_start_outgoing_migration(p, max_throttle, detach); |
67 |
else if (strstart(uri, "unix:", &p)) |
68 |
s = unix_start_outgoing_migration(p, max_throttle, detach); |
69 |
else if (strstart(uri, "fd:", &p)) |
70 |
s = fd_start_outgoing_migration(mon, p, max_throttle, detach); |
71 |
#endif
|
72 |
else
|
73 |
monitor_printf(mon, "unknown migration protocol: %s\n", uri);
|
74 |
|
75 |
if (s == NULL) |
76 |
monitor_printf(mon, "migration failed\n");
|
77 |
else {
|
78 |
if (current_migration)
|
79 |
current_migration->release(current_migration); |
80 |
|
81 |
current_migration = s; |
82 |
} |
83 |
} |
84 |
|
85 |
void do_migrate_cancel(Monitor *mon, const QDict *qdict) |
86 |
{ |
87 |
MigrationState *s = current_migration; |
88 |
|
89 |
if (s)
|
90 |
s->cancel(s); |
91 |
} |
92 |
|
93 |
void do_migrate_set_speed(Monitor *mon, const QDict *qdict) |
94 |
{ |
95 |
double d;
|
96 |
char *ptr;
|
97 |
FdMigrationState *s; |
98 |
const char *value = qdict_get_str(qdict, "value"); |
99 |
|
100 |
d = strtod(value, &ptr); |
101 |
switch (*ptr) {
|
102 |
case 'G': case 'g': |
103 |
d *= 1024;
|
104 |
case 'M': case 'm': |
105 |
d *= 1024;
|
106 |
case 'K': case 'k': |
107 |
d *= 1024;
|
108 |
default:
|
109 |
break;
|
110 |
} |
111 |
|
112 |
max_throttle = (uint32_t)d; |
113 |
s = migrate_to_fms(current_migration); |
114 |
|
115 |
if (s) {
|
116 |
qemu_file_set_rate_limit(s->file, max_throttle); |
117 |
} |
118 |
|
119 |
} |
120 |
|
121 |
/* amount of nanoseconds we are willing to wait for migration to be down.
|
122 |
* the choice of nanoseconds is because it is the maximum resolution that
|
123 |
* get_clock() can achieve. It is an internal measure. All user-visible
|
124 |
* units must be in seconds */
|
125 |
static uint64_t max_downtime = 30000000; |
126 |
|
127 |
uint64_t migrate_max_downtime(void)
|
128 |
{ |
129 |
return max_downtime;
|
130 |
} |
131 |
|
132 |
void do_migrate_set_downtime(Monitor *mon, const QDict *qdict) |
133 |
{ |
134 |
char *ptr;
|
135 |
double d;
|
136 |
const char *value = qdict_get_str(qdict, "value"); |
137 |
|
138 |
d = strtod(value, &ptr); |
139 |
if (!strcmp(ptr,"ms")) { |
140 |
d *= 1000000;
|
141 |
} else if (!strcmp(ptr,"us")) { |
142 |
d *= 1000;
|
143 |
} else if (!strcmp(ptr,"ns")) { |
144 |
} else {
|
145 |
/* all else considered to be seconds */
|
146 |
d *= 1000000000;
|
147 |
} |
148 |
|
149 |
max_downtime = (uint64_t)d; |
150 |
} |
151 |
|
152 |
void do_info_migrate(Monitor *mon)
|
153 |
{ |
154 |
MigrationState *s = current_migration; |
155 |
|
156 |
if (s) {
|
157 |
monitor_printf(mon, "Migration status: ");
|
158 |
switch (s->get_status(s)) {
|
159 |
case MIG_STATE_ACTIVE:
|
160 |
monitor_printf(mon, "active\n");
|
161 |
monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n", ram_bytes_transferred() >> 10); |
162 |
monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n", ram_bytes_remaining() >> 10); |
163 |
monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n", ram_bytes_total() >> 10); |
164 |
break;
|
165 |
case MIG_STATE_COMPLETED:
|
166 |
monitor_printf(mon, "completed\n");
|
167 |
break;
|
168 |
case MIG_STATE_ERROR:
|
169 |
monitor_printf(mon, "failed\n");
|
170 |
break;
|
171 |
case MIG_STATE_CANCELLED:
|
172 |
monitor_printf(mon, "cancelled\n");
|
173 |
break;
|
174 |
} |
175 |
} |
176 |
} |
177 |
|
178 |
/* shared migration helpers */
|
179 |
|
180 |
void migrate_fd_monitor_suspend(FdMigrationState *s)
|
181 |
{ |
182 |
s->mon_resume = cur_mon; |
183 |
if (monitor_suspend(cur_mon) == 0) |
184 |
dprintf("suspending monitor\n");
|
185 |
else
|
186 |
monitor_printf(cur_mon, "terminal does not allow synchronous "
|
187 |
"migration, continuing detached\n");
|
188 |
} |
189 |
|
190 |
void migrate_fd_error(FdMigrationState *s)
|
191 |
{ |
192 |
dprintf("setting error state\n");
|
193 |
s->state = MIG_STATE_ERROR; |
194 |
migrate_fd_cleanup(s); |
195 |
} |
196 |
|
197 |
void migrate_fd_cleanup(FdMigrationState *s)
|
198 |
{ |
199 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
200 |
|
201 |
if (s->file) {
|
202 |
dprintf("closing file\n");
|
203 |
qemu_fclose(s->file); |
204 |
} |
205 |
|
206 |
if (s->fd != -1) |
207 |
close(s->fd); |
208 |
|
209 |
/* Don't resume monitor until we've flushed all of the buffers */
|
210 |
if (s->mon_resume)
|
211 |
monitor_resume(s->mon_resume); |
212 |
|
213 |
s->fd = -1;
|
214 |
} |
215 |
|
216 |
void migrate_fd_put_notify(void *opaque) |
217 |
{ |
218 |
FdMigrationState *s = opaque; |
219 |
|
220 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
221 |
qemu_file_put_notify(s->file); |
222 |
} |
223 |
|
224 |
ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size) |
225 |
{ |
226 |
FdMigrationState *s = opaque; |
227 |
ssize_t ret; |
228 |
|
229 |
do {
|
230 |
ret = s->write(s, data, size); |
231 |
} while (ret == -1 && ((s->get_error(s)) == EINTR)); |
232 |
|
233 |
if (ret == -1) |
234 |
ret = -(s->get_error(s)); |
235 |
|
236 |
if (ret == -EAGAIN)
|
237 |
qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s); |
238 |
|
239 |
return ret;
|
240 |
} |
241 |
|
242 |
void migrate_fd_connect(FdMigrationState *s)
|
243 |
{ |
244 |
int ret;
|
245 |
|
246 |
s->file = qemu_fopen_ops_buffered(s, |
247 |
s->bandwidth_limit, |
248 |
migrate_fd_put_buffer, |
249 |
migrate_fd_put_ready, |
250 |
migrate_fd_wait_for_unfreeze, |
251 |
migrate_fd_close); |
252 |
|
253 |
dprintf("beginning savevm\n");
|
254 |
ret = qemu_savevm_state_begin(s->file); |
255 |
if (ret < 0) { |
256 |
dprintf("failed, %d\n", ret);
|
257 |
migrate_fd_error(s); |
258 |
return;
|
259 |
} |
260 |
|
261 |
migrate_fd_put_ready(s); |
262 |
} |
263 |
|
264 |
void migrate_fd_put_ready(void *opaque) |
265 |
{ |
266 |
FdMigrationState *s = opaque; |
267 |
|
268 |
if (s->state != MIG_STATE_ACTIVE) {
|
269 |
dprintf("put_ready returning because of non-active state\n");
|
270 |
return;
|
271 |
} |
272 |
|
273 |
dprintf("iterate\n");
|
274 |
if (qemu_savevm_state_iterate(s->file) == 1) { |
275 |
int state;
|
276 |
int old_vm_running = vm_running;
|
277 |
|
278 |
dprintf("done iterating\n");
|
279 |
vm_stop(0);
|
280 |
|
281 |
qemu_aio_flush(); |
282 |
bdrv_flush_all(); |
283 |
if ((qemu_savevm_state_complete(s->file)) < 0) { |
284 |
if (old_vm_running) {
|
285 |
vm_start(); |
286 |
} |
287 |
state = MIG_STATE_ERROR; |
288 |
} else {
|
289 |
state = MIG_STATE_COMPLETED; |
290 |
} |
291 |
migrate_fd_cleanup(s); |
292 |
s->state = state; |
293 |
} |
294 |
} |
295 |
|
296 |
int migrate_fd_get_status(MigrationState *mig_state)
|
297 |
{ |
298 |
FdMigrationState *s = migrate_to_fms(mig_state); |
299 |
return s->state;
|
300 |
} |
301 |
|
302 |
void migrate_fd_cancel(MigrationState *mig_state)
|
303 |
{ |
304 |
FdMigrationState *s = migrate_to_fms(mig_state); |
305 |
|
306 |
if (s->state != MIG_STATE_ACTIVE)
|
307 |
return;
|
308 |
|
309 |
dprintf("cancelling migration\n");
|
310 |
|
311 |
s->state = MIG_STATE_CANCELLED; |
312 |
|
313 |
migrate_fd_cleanup(s); |
314 |
} |
315 |
|
316 |
void migrate_fd_release(MigrationState *mig_state)
|
317 |
{ |
318 |
FdMigrationState *s = migrate_to_fms(mig_state); |
319 |
|
320 |
dprintf("releasing state\n");
|
321 |
|
322 |
if (s->state == MIG_STATE_ACTIVE) {
|
323 |
s->state = MIG_STATE_CANCELLED; |
324 |
migrate_fd_cleanup(s); |
325 |
} |
326 |
free(s); |
327 |
} |
328 |
|
329 |
void migrate_fd_wait_for_unfreeze(void *opaque) |
330 |
{ |
331 |
FdMigrationState *s = opaque; |
332 |
int ret;
|
333 |
|
334 |
dprintf("wait for unfreeze\n");
|
335 |
if (s->state != MIG_STATE_ACTIVE)
|
336 |
return;
|
337 |
|
338 |
do {
|
339 |
fd_set wfds; |
340 |
|
341 |
FD_ZERO(&wfds); |
342 |
FD_SET(s->fd, &wfds); |
343 |
|
344 |
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); |
345 |
} while (ret == -1 && (s->get_error(s)) == EINTR); |
346 |
} |
347 |
|
348 |
int migrate_fd_close(void *opaque) |
349 |
{ |
350 |
FdMigrationState *s = opaque; |
351 |
|
352 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
353 |
return s->close(s);
|
354 |
} |