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Commit | Line | Data |
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a672b469 AL |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
76cc7b58 JQ |
5 | * Copyright (c) 2009-2015 Red Hat Inc |
6 | * | |
7 | * Authors: | |
8 | * Juan Quintela <quintela@redhat.com> | |
a672b469 AL |
9 | * |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
a672b469 | 28 | |
1393a485 | 29 | #include "qemu/osdep.h" |
33c11879 | 30 | #include "cpu.h" |
abfd9ce3 | 31 | #include "hw/boards.h" |
511d2b14 | 32 | #include "hw/hw.h" |
7685ee6a | 33 | #include "hw/qdev.h" |
88c16567 | 34 | #include "hw/xen/xen.h" |
1422e32d | 35 | #include "net/net.h" |
83c9089e | 36 | #include "monitor/monitor.h" |
9c17d615 | 37 | #include "sysemu/sysemu.h" |
1de7afc9 | 38 | #include "qemu/timer.h" |
511d2b14 | 39 | #include "audio/audio.h" |
caf71f86 | 40 | #include "migration/migration.h" |
eb59db53 | 41 | #include "migration/postcopy-ram.h" |
cc7a8ea7 | 42 | #include "qapi/qmp/qerror.h" |
d49b6836 | 43 | #include "qemu/error-report.h" |
1de7afc9 PB |
44 | #include "qemu/sockets.h" |
45 | #include "qemu/queue.h" | |
9c17d615 | 46 | #include "sysemu/cpus.h" |
022c62cb | 47 | #include "exec/memory.h" |
a7ae8355 | 48 | #include "qmp-commands.h" |
517a13c9 | 49 | #include "trace.h" |
093e3c42 | 50 | #include "qemu/bitops.h" |
28085f7b | 51 | #include "qemu/iov.h" |
de08c606 | 52 | #include "block/snapshot.h" |
f364ec65 | 53 | #include "block/qapi.h" |
f348b6d1 | 54 | #include "qemu/cutils.h" |
61b67d47 | 55 | #include "io/channel-buffer.h" |
8925839f | 56 | #include "io/channel-file.h" |
a672b469 | 57 | |
18995b98 | 58 | #ifndef ETH_P_RARP |
f8778a77 | 59 | #define ETH_P_RARP 0x8035 |
18995b98 N |
60 | #endif |
61 | #define ARP_HTYPE_ETH 0x0001 | |
62 | #define ARP_PTYPE_IP 0x0800 | |
63 | #define ARP_OP_REQUEST_REV 0x3 | |
64 | ||
093e3c42 DDAG |
65 | const unsigned int postcopy_ram_discard_version = 0; |
66 | ||
37fb569c DDAG |
67 | static bool skip_section_footers; |
68 | ||
c76ca188 DDAG |
69 | static struct mig_cmd_args { |
70 | ssize_t len; /* -1 = variable */ | |
71 | const char *name; | |
72 | } mig_cmd_args[] = { | |
73 | [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" }, | |
2e37701e DDAG |
74 | [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" }, |
75 | [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" }, | |
093e3c42 DDAG |
76 | [MIG_CMD_POSTCOPY_ADVISE] = { .len = 16, .name = "POSTCOPY_ADVISE" }, |
77 | [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" }, | |
78 | [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" }, | |
79 | [MIG_CMD_POSTCOPY_RAM_DISCARD] = { | |
80 | .len = -1, .name = "POSTCOPY_RAM_DISCARD" }, | |
11cf1d98 | 81 | [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, |
c76ca188 DDAG |
82 | [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, |
83 | }; | |
84 | ||
18995b98 | 85 | static int announce_self_create(uint8_t *buf, |
5cecf414 | 86 | uint8_t *mac_addr) |
a672b469 | 87 | { |
18995b98 N |
88 | /* Ethernet header. */ |
89 | memset(buf, 0xff, 6); /* destination MAC addr */ | |
90 | memcpy(buf + 6, mac_addr, 6); /* source MAC addr */ | |
91 | *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */ | |
92 | ||
93 | /* RARP header. */ | |
94 | *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */ | |
95 | *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */ | |
96 | *(buf + 18) = 6; /* hardware addr length (ethernet) */ | |
97 | *(buf + 19) = 4; /* protocol addr length (IPv4) */ | |
98 | *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */ | |
99 | memcpy(buf + 22, mac_addr, 6); /* source hw addr */ | |
100 | memset(buf + 28, 0x00, 4); /* source protocol addr */ | |
101 | memcpy(buf + 32, mac_addr, 6); /* target hw addr */ | |
102 | memset(buf + 38, 0x00, 4); /* target protocol addr */ | |
103 | ||
104 | /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */ | |
105 | memset(buf + 42, 0x00, 18); | |
106 | ||
107 | return 60; /* len (FCS will be added by hardware) */ | |
a672b469 AL |
108 | } |
109 | ||
f401ca22 | 110 | static void qemu_announce_self_iter(NICState *nic, void *opaque) |
a672b469 | 111 | { |
18995b98 | 112 | uint8_t buf[60]; |
f401ca22 MM |
113 | int len; |
114 | ||
9013dca5 | 115 | trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr)); |
f401ca22 MM |
116 | len = announce_self_create(buf, nic->conf->macaddr.a); |
117 | ||
b356f76d | 118 | qemu_send_packet_raw(qemu_get_queue(nic), buf, len); |
f401ca22 MM |
119 | } |
120 | ||
121 | ||
122 | static void qemu_announce_self_once(void *opaque) | |
123 | { | |
ed8b330b GN |
124 | static int count = SELF_ANNOUNCE_ROUNDS; |
125 | QEMUTimer *timer = *(QEMUTimer **)opaque; | |
a672b469 | 126 | |
f401ca22 MM |
127 | qemu_foreach_nic(qemu_announce_self_iter, NULL); |
128 | ||
18995b98 N |
129 | if (--count) { |
130 | /* delay 50ms, 150ms, 250ms, ... */ | |
bc72ad67 | 131 | timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + |
508e1180 | 132 | self_announce_delay(count)); |
ed8b330b | 133 | } else { |
5cecf414 EH |
134 | timer_del(timer); |
135 | timer_free(timer); | |
ed8b330b GN |
136 | } |
137 | } | |
138 | ||
139 | void qemu_announce_self(void) | |
140 | { | |
5cecf414 EH |
141 | static QEMUTimer *timer; |
142 | timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer); | |
143 | qemu_announce_self_once(&timer); | |
a672b469 AL |
144 | } |
145 | ||
146 | /***********************************************************/ | |
147 | /* savevm/loadvm support */ | |
148 | ||
05fcc848 KW |
149 | static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, |
150 | int64_t pos) | |
151 | { | |
152 | int ret; | |
153 | QEMUIOVector qiov; | |
154 | ||
155 | qemu_iovec_init_external(&qiov, iov, iovcnt); | |
156 | ret = bdrv_writev_vmstate(opaque, &qiov, pos); | |
157 | if (ret < 0) { | |
158 | return ret; | |
159 | } | |
160 | ||
161 | return qiov.size; | |
162 | } | |
163 | ||
a202a4c0 DDAG |
164 | static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, |
165 | size_t size) | |
a672b469 | 166 | { |
45566e9c | 167 | return bdrv_load_vmstate(opaque, buf, pos, size); |
a672b469 AL |
168 | } |
169 | ||
170 | static int bdrv_fclose(void *opaque) | |
171 | { | |
ad492c92 | 172 | return bdrv_flush(opaque); |
a672b469 AL |
173 | } |
174 | ||
9229bf3c PB |
175 | static const QEMUFileOps bdrv_read_ops = { |
176 | .get_buffer = block_get_buffer, | |
177 | .close = bdrv_fclose | |
178 | }; | |
179 | ||
180 | static const QEMUFileOps bdrv_write_ops = { | |
05fcc848 KW |
181 | .writev_buffer = block_writev_buffer, |
182 | .close = bdrv_fclose | |
9229bf3c PB |
183 | }; |
184 | ||
45566e9c | 185 | static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable) |
a672b469 | 186 | { |
38ff78d3 | 187 | if (is_writable) { |
9229bf3c | 188 | return qemu_fopen_ops(bs, &bdrv_write_ops); |
38ff78d3 | 189 | } |
9229bf3c | 190 | return qemu_fopen_ops(bs, &bdrv_read_ops); |
a672b469 AL |
191 | } |
192 | ||
2ff68d07 | 193 | |
bb1a6d8c EH |
194 | /* QEMUFile timer support. |
195 | * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c | |
196 | */ | |
2ff68d07 | 197 | |
40daca54 | 198 | void timer_put(QEMUFile *f, QEMUTimer *ts) |
2ff68d07 PB |
199 | { |
200 | uint64_t expire_time; | |
201 | ||
e93379b0 | 202 | expire_time = timer_expire_time_ns(ts); |
2ff68d07 PB |
203 | qemu_put_be64(f, expire_time); |
204 | } | |
205 | ||
40daca54 | 206 | void timer_get(QEMUFile *f, QEMUTimer *ts) |
2ff68d07 PB |
207 | { |
208 | uint64_t expire_time; | |
209 | ||
210 | expire_time = qemu_get_be64(f); | |
211 | if (expire_time != -1) { | |
bc72ad67 | 212 | timer_mod_ns(ts, expire_time); |
2ff68d07 | 213 | } else { |
bc72ad67 | 214 | timer_del(ts); |
2ff68d07 PB |
215 | } |
216 | } | |
217 | ||
218 | ||
bb1a6d8c EH |
219 | /* VMState timer support. |
220 | * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c | |
221 | */ | |
dde0463b | 222 | |
2c21ee76 | 223 | static int get_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field) |
dde0463b JQ |
224 | { |
225 | QEMUTimer *v = pv; | |
40daca54 | 226 | timer_get(f, v); |
dde0463b JQ |
227 | return 0; |
228 | } | |
229 | ||
2c21ee76 JD |
230 | static int put_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field, |
231 | QJSON *vmdesc) | |
dde0463b | 232 | { |
84e2e3eb | 233 | QEMUTimer *v = pv; |
40daca54 | 234 | timer_put(f, v); |
2c21ee76 JD |
235 | |
236 | return 0; | |
dde0463b JQ |
237 | } |
238 | ||
239 | const VMStateInfo vmstate_info_timer = { | |
240 | .name = "timer", | |
241 | .get = get_timer, | |
242 | .put = put_timer, | |
243 | }; | |
244 | ||
08e99e29 | 245 | |
7685ee6a AW |
246 | typedef struct CompatEntry { |
247 | char idstr[256]; | |
248 | int instance_id; | |
249 | } CompatEntry; | |
250 | ||
a672b469 | 251 | typedef struct SaveStateEntry { |
72cf2d4f | 252 | QTAILQ_ENTRY(SaveStateEntry) entry; |
a672b469 AL |
253 | char idstr[256]; |
254 | int instance_id; | |
4d2ffa08 | 255 | int alias_id; |
a672b469 AL |
256 | int version_id; |
257 | int section_id; | |
22ea40f4 | 258 | SaveVMHandlers *ops; |
9ed7d6ae | 259 | const VMStateDescription *vmsd; |
a672b469 | 260 | void *opaque; |
7685ee6a | 261 | CompatEntry *compat; |
a7ae8355 | 262 | int is_ram; |
a672b469 AL |
263 | } SaveStateEntry; |
264 | ||
0163a2e0 JQ |
265 | typedef struct SaveState { |
266 | QTAILQ_HEAD(, SaveStateEntry) handlers; | |
267 | int global_section_id; | |
61964c23 JQ |
268 | bool skip_configuration; |
269 | uint32_t len; | |
270 | const char *name; | |
59811a32 | 271 | uint32_t target_page_bits; |
0163a2e0 JQ |
272 | } SaveState; |
273 | ||
274 | static SaveState savevm_state = { | |
275 | .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), | |
276 | .global_section_id = 0, | |
61964c23 JQ |
277 | .skip_configuration = false, |
278 | }; | |
279 | ||
280 | void savevm_skip_configuration(void) | |
281 | { | |
282 | savevm_state.skip_configuration = true; | |
283 | } | |
284 | ||
285 | ||
286 | static void configuration_pre_save(void *opaque) | |
287 | { | |
288 | SaveState *state = opaque; | |
289 | const char *current_name = MACHINE_GET_CLASS(current_machine)->name; | |
290 | ||
291 | state->len = strlen(current_name); | |
292 | state->name = current_name; | |
59811a32 PM |
293 | state->target_page_bits = TARGET_PAGE_BITS; |
294 | } | |
295 | ||
296 | static int configuration_pre_load(void *opaque) | |
297 | { | |
298 | SaveState *state = opaque; | |
299 | ||
300 | /* If there is no target-page-bits subsection it means the source | |
301 | * predates the variable-target-page-bits support and is using the | |
302 | * minimum possible value for this CPU. | |
303 | */ | |
304 | state->target_page_bits = TARGET_PAGE_BITS_MIN; | |
305 | return 0; | |
61964c23 JQ |
306 | } |
307 | ||
308 | static int configuration_post_load(void *opaque, int version_id) | |
309 | { | |
310 | SaveState *state = opaque; | |
311 | const char *current_name = MACHINE_GET_CLASS(current_machine)->name; | |
312 | ||
313 | if (strncmp(state->name, current_name, state->len) != 0) { | |
15d61692 GK |
314 | error_report("Machine type received is '%.*s' and local is '%s'", |
315 | (int) state->len, state->name, current_name); | |
61964c23 JQ |
316 | return -EINVAL; |
317 | } | |
59811a32 PM |
318 | |
319 | if (state->target_page_bits != TARGET_PAGE_BITS) { | |
320 | error_report("Received TARGET_PAGE_BITS is %d but local is %d", | |
321 | state->target_page_bits, TARGET_PAGE_BITS); | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
61964c23 JQ |
325 | return 0; |
326 | } | |
327 | ||
59811a32 PM |
328 | /* The target-page-bits subsection is present only if the |
329 | * target page size is not the same as the default (ie the | |
330 | * minimum page size for a variable-page-size guest CPU). | |
331 | * If it is present then it contains the actual target page | |
332 | * bits for the machine, and migration will fail if the | |
333 | * two ends don't agree about it. | |
334 | */ | |
335 | static bool vmstate_target_page_bits_needed(void *opaque) | |
336 | { | |
337 | return TARGET_PAGE_BITS > TARGET_PAGE_BITS_MIN; | |
338 | } | |
339 | ||
340 | static const VMStateDescription vmstate_target_page_bits = { | |
341 | .name = "configuration/target-page-bits", | |
342 | .version_id = 1, | |
343 | .minimum_version_id = 1, | |
344 | .needed = vmstate_target_page_bits_needed, | |
345 | .fields = (VMStateField[]) { | |
346 | VMSTATE_UINT32(target_page_bits, SaveState), | |
347 | VMSTATE_END_OF_LIST() | |
348 | } | |
349 | }; | |
350 | ||
61964c23 JQ |
351 | static const VMStateDescription vmstate_configuration = { |
352 | .name = "configuration", | |
353 | .version_id = 1, | |
59811a32 | 354 | .pre_load = configuration_pre_load, |
61964c23 JQ |
355 | .post_load = configuration_post_load, |
356 | .pre_save = configuration_pre_save, | |
357 | .fields = (VMStateField[]) { | |
358 | VMSTATE_UINT32(len, SaveState), | |
359 | VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, 0, len), | |
360 | VMSTATE_END_OF_LIST() | |
361 | }, | |
59811a32 PM |
362 | .subsections = (const VMStateDescription*[]) { |
363 | &vmstate_target_page_bits, | |
364 | NULL | |
365 | } | |
0163a2e0 | 366 | }; |
a672b469 | 367 | |
abfd9ce3 AS |
368 | static void dump_vmstate_vmsd(FILE *out_file, |
369 | const VMStateDescription *vmsd, int indent, | |
370 | bool is_subsection); | |
371 | ||
372 | static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field, | |
373 | int indent) | |
374 | { | |
375 | fprintf(out_file, "%*s{\n", indent, ""); | |
376 | indent += 2; | |
377 | fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name); | |
378 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
379 | field->version_id); | |
380 | fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "", | |
381 | field->field_exists ? "true" : "false"); | |
382 | fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size); | |
383 | if (field->vmsd != NULL) { | |
384 | fprintf(out_file, ",\n"); | |
385 | dump_vmstate_vmsd(out_file, field->vmsd, indent, false); | |
386 | } | |
387 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
388 | } | |
389 | ||
390 | static void dump_vmstate_vmss(FILE *out_file, | |
5cd8cada | 391 | const VMStateDescription **subsection, |
abfd9ce3 AS |
392 | int indent) |
393 | { | |
5cd8cada JQ |
394 | if (*subsection != NULL) { |
395 | dump_vmstate_vmsd(out_file, *subsection, indent, true); | |
abfd9ce3 AS |
396 | } |
397 | } | |
398 | ||
399 | static void dump_vmstate_vmsd(FILE *out_file, | |
400 | const VMStateDescription *vmsd, int indent, | |
401 | bool is_subsection) | |
402 | { | |
403 | if (is_subsection) { | |
404 | fprintf(out_file, "%*s{\n", indent, ""); | |
405 | } else { | |
406 | fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description"); | |
407 | } | |
408 | indent += 2; | |
409 | fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name); | |
410 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
411 | vmsd->version_id); | |
412 | fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "", | |
413 | vmsd->minimum_version_id); | |
414 | if (vmsd->fields != NULL) { | |
415 | const VMStateField *field = vmsd->fields; | |
416 | bool first; | |
417 | ||
418 | fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, ""); | |
419 | first = true; | |
420 | while (field->name != NULL) { | |
421 | if (field->flags & VMS_MUST_EXIST) { | |
422 | /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */ | |
423 | field++; | |
424 | continue; | |
425 | } | |
426 | if (!first) { | |
427 | fprintf(out_file, ",\n"); | |
428 | } | |
429 | dump_vmstate_vmsf(out_file, field, indent + 2); | |
430 | field++; | |
431 | first = false; | |
432 | } | |
433 | fprintf(out_file, "\n%*s]", indent, ""); | |
434 | } | |
435 | if (vmsd->subsections != NULL) { | |
5cd8cada | 436 | const VMStateDescription **subsection = vmsd->subsections; |
abfd9ce3 AS |
437 | bool first; |
438 | ||
439 | fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, ""); | |
440 | first = true; | |
5cd8cada | 441 | while (*subsection != NULL) { |
abfd9ce3 AS |
442 | if (!first) { |
443 | fprintf(out_file, ",\n"); | |
444 | } | |
445 | dump_vmstate_vmss(out_file, subsection, indent + 2); | |
446 | subsection++; | |
447 | first = false; | |
448 | } | |
449 | fprintf(out_file, "\n%*s]", indent, ""); | |
450 | } | |
451 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
452 | } | |
453 | ||
454 | static void dump_machine_type(FILE *out_file) | |
455 | { | |
456 | MachineClass *mc; | |
457 | ||
458 | mc = MACHINE_GET_CLASS(current_machine); | |
459 | ||
460 | fprintf(out_file, " \"vmschkmachine\": {\n"); | |
461 | fprintf(out_file, " \"Name\": \"%s\"\n", mc->name); | |
462 | fprintf(out_file, " },\n"); | |
463 | } | |
464 | ||
465 | void dump_vmstate_json_to_file(FILE *out_file) | |
466 | { | |
467 | GSList *list, *elt; | |
468 | bool first; | |
469 | ||
470 | fprintf(out_file, "{\n"); | |
471 | dump_machine_type(out_file); | |
472 | ||
473 | first = true; | |
474 | list = object_class_get_list(TYPE_DEVICE, true); | |
475 | for (elt = list; elt; elt = elt->next) { | |
476 | DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data, | |
477 | TYPE_DEVICE); | |
478 | const char *name; | |
479 | int indent = 2; | |
480 | ||
481 | if (!dc->vmsd) { | |
482 | continue; | |
483 | } | |
484 | ||
485 | if (!first) { | |
486 | fprintf(out_file, ",\n"); | |
487 | } | |
488 | name = object_class_get_name(OBJECT_CLASS(dc)); | |
489 | fprintf(out_file, "%*s\"%s\": {\n", indent, "", name); | |
490 | indent += 2; | |
491 | fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name); | |
492 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
493 | dc->vmsd->version_id); | |
494 | fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "", | |
495 | dc->vmsd->minimum_version_id); | |
496 | ||
497 | dump_vmstate_vmsd(out_file, dc->vmsd, indent, false); | |
498 | ||
499 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
500 | first = false; | |
501 | } | |
502 | fprintf(out_file, "\n}\n"); | |
503 | fclose(out_file); | |
504 | } | |
505 | ||
8718e999 JQ |
506 | static int calculate_new_instance_id(const char *idstr) |
507 | { | |
508 | SaveStateEntry *se; | |
509 | int instance_id = 0; | |
510 | ||
0163a2e0 | 511 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
8718e999 JQ |
512 | if (strcmp(idstr, se->idstr) == 0 |
513 | && instance_id <= se->instance_id) { | |
514 | instance_id = se->instance_id + 1; | |
515 | } | |
516 | } | |
517 | return instance_id; | |
518 | } | |
519 | ||
7685ee6a AW |
520 | static int calculate_compat_instance_id(const char *idstr) |
521 | { | |
522 | SaveStateEntry *se; | |
523 | int instance_id = 0; | |
524 | ||
0163a2e0 | 525 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
38ff78d3 | 526 | if (!se->compat) { |
7685ee6a | 527 | continue; |
38ff78d3 | 528 | } |
7685ee6a AW |
529 | |
530 | if (strcmp(idstr, se->compat->idstr) == 0 | |
531 | && instance_id <= se->compat->instance_id) { | |
532 | instance_id = se->compat->instance_id + 1; | |
533 | } | |
534 | } | |
535 | return instance_id; | |
536 | } | |
537 | ||
f37bc036 PX |
538 | static inline MigrationPriority save_state_priority(SaveStateEntry *se) |
539 | { | |
540 | if (se->vmsd) { | |
541 | return se->vmsd->priority; | |
542 | } | |
543 | return MIG_PRI_DEFAULT; | |
544 | } | |
545 | ||
546 | static void savevm_state_handler_insert(SaveStateEntry *nse) | |
547 | { | |
548 | MigrationPriority priority = save_state_priority(nse); | |
549 | SaveStateEntry *se; | |
550 | ||
551 | assert(priority <= MIG_PRI_MAX); | |
552 | ||
553 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
554 | if (save_state_priority(se) < priority) { | |
555 | break; | |
556 | } | |
557 | } | |
558 | ||
559 | if (se) { | |
560 | QTAILQ_INSERT_BEFORE(se, nse, entry); | |
561 | } else { | |
562 | QTAILQ_INSERT_TAIL(&savevm_state.handlers, nse, entry); | |
563 | } | |
564 | } | |
565 | ||
a672b469 AL |
566 | /* TODO: Individual devices generally have very little idea about the rest |
567 | of the system, so instance_id should be removed/replaced. | |
568 | Meanwhile pass -1 as instance_id if you do not already have a clearly | |
569 | distinguishing id for all instances of your device class. */ | |
0be71e32 AW |
570 | int register_savevm_live(DeviceState *dev, |
571 | const char *idstr, | |
a672b469 AL |
572 | int instance_id, |
573 | int version_id, | |
7908c78d | 574 | SaveVMHandlers *ops, |
a672b469 AL |
575 | void *opaque) |
576 | { | |
8718e999 | 577 | SaveStateEntry *se; |
a672b469 | 578 | |
97f3ad35 | 579 | se = g_new0(SaveStateEntry, 1); |
a672b469 | 580 | se->version_id = version_id; |
0163a2e0 | 581 | se->section_id = savevm_state.global_section_id++; |
7908c78d | 582 | se->ops = ops; |
a672b469 | 583 | se->opaque = opaque; |
9ed7d6ae | 584 | se->vmsd = NULL; |
a7ae8355 | 585 | /* if this is a live_savem then set is_ram */ |
16310a3c | 586 | if (ops->save_live_setup != NULL) { |
a7ae8355 SS |
587 | se->is_ram = 1; |
588 | } | |
a672b469 | 589 | |
09e5ab63 AL |
590 | if (dev) { |
591 | char *id = qdev_get_dev_path(dev); | |
7685ee6a AW |
592 | if (id) { |
593 | pstrcpy(se->idstr, sizeof(se->idstr), id); | |
594 | pstrcat(se->idstr, sizeof(se->idstr), "/"); | |
7267c094 | 595 | g_free(id); |
7685ee6a | 596 | |
97f3ad35 | 597 | se->compat = g_new0(CompatEntry, 1); |
7685ee6a AW |
598 | pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr); |
599 | se->compat->instance_id = instance_id == -1 ? | |
600 | calculate_compat_instance_id(idstr) : instance_id; | |
601 | instance_id = -1; | |
602 | } | |
603 | } | |
604 | pstrcat(se->idstr, sizeof(se->idstr), idstr); | |
605 | ||
8718e999 | 606 | if (instance_id == -1) { |
7685ee6a | 607 | se->instance_id = calculate_new_instance_id(se->idstr); |
8718e999 JQ |
608 | } else { |
609 | se->instance_id = instance_id; | |
a672b469 | 610 | } |
7685ee6a | 611 | assert(!se->compat || se->instance_id == 0); |
f37bc036 | 612 | savevm_state_handler_insert(se); |
a672b469 AL |
613 | return 0; |
614 | } | |
615 | ||
0be71e32 AW |
616 | int register_savevm(DeviceState *dev, |
617 | const char *idstr, | |
a672b469 AL |
618 | int instance_id, |
619 | int version_id, | |
620 | SaveStateHandler *save_state, | |
621 | LoadStateHandler *load_state, | |
622 | void *opaque) | |
623 | { | |
97f3ad35 | 624 | SaveVMHandlers *ops = g_new0(SaveVMHandlers, 1); |
7908c78d JQ |
625 | ops->save_state = save_state; |
626 | ops->load_state = load_state; | |
0be71e32 | 627 | return register_savevm_live(dev, idstr, instance_id, version_id, |
7908c78d | 628 | ops, opaque); |
a672b469 AL |
629 | } |
630 | ||
0be71e32 | 631 | void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque) |
41bd13af | 632 | { |
8718e999 | 633 | SaveStateEntry *se, *new_se; |
7685ee6a AW |
634 | char id[256] = ""; |
635 | ||
09e5ab63 AL |
636 | if (dev) { |
637 | char *path = qdev_get_dev_path(dev); | |
7685ee6a AW |
638 | if (path) { |
639 | pstrcpy(id, sizeof(id), path); | |
640 | pstrcat(id, sizeof(id), "/"); | |
7267c094 | 641 | g_free(path); |
7685ee6a AW |
642 | } |
643 | } | |
644 | pstrcat(id, sizeof(id), idstr); | |
41bd13af | 645 | |
0163a2e0 | 646 | QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
7685ee6a | 647 | if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { |
0163a2e0 | 648 | QTAILQ_REMOVE(&savevm_state.handlers, se, entry); |
ef1e1e07 | 649 | g_free(se->compat); |
22ea40f4 | 650 | g_free(se->ops); |
7267c094 | 651 | g_free(se); |
41bd13af | 652 | } |
41bd13af AL |
653 | } |
654 | } | |
655 | ||
0be71e32 | 656 | int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, |
4d2ffa08 JK |
657 | const VMStateDescription *vmsd, |
658 | void *opaque, int alias_id, | |
659 | int required_for_version) | |
9ed7d6ae | 660 | { |
8718e999 | 661 | SaveStateEntry *se; |
9ed7d6ae | 662 | |
4d2ffa08 JK |
663 | /* If this triggers, alias support can be dropped for the vmsd. */ |
664 | assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id); | |
665 | ||
97f3ad35 | 666 | se = g_new0(SaveStateEntry, 1); |
9ed7d6ae | 667 | se->version_id = vmsd->version_id; |
0163a2e0 | 668 | se->section_id = savevm_state.global_section_id++; |
9ed7d6ae JQ |
669 | se->opaque = opaque; |
670 | se->vmsd = vmsd; | |
4d2ffa08 | 671 | se->alias_id = alias_id; |
9ed7d6ae | 672 | |
09e5ab63 AL |
673 | if (dev) { |
674 | char *id = qdev_get_dev_path(dev); | |
7685ee6a AW |
675 | if (id) { |
676 | pstrcpy(se->idstr, sizeof(se->idstr), id); | |
677 | pstrcat(se->idstr, sizeof(se->idstr), "/"); | |
7267c094 | 678 | g_free(id); |
7685ee6a | 679 | |
97f3ad35 | 680 | se->compat = g_new0(CompatEntry, 1); |
7685ee6a AW |
681 | pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name); |
682 | se->compat->instance_id = instance_id == -1 ? | |
683 | calculate_compat_instance_id(vmsd->name) : instance_id; | |
684 | instance_id = -1; | |
685 | } | |
686 | } | |
687 | pstrcat(se->idstr, sizeof(se->idstr), vmsd->name); | |
688 | ||
8718e999 | 689 | if (instance_id == -1) { |
7685ee6a | 690 | se->instance_id = calculate_new_instance_id(se->idstr); |
8718e999 JQ |
691 | } else { |
692 | se->instance_id = instance_id; | |
9ed7d6ae | 693 | } |
7685ee6a | 694 | assert(!se->compat || se->instance_id == 0); |
f37bc036 | 695 | savevm_state_handler_insert(se); |
9ed7d6ae JQ |
696 | return 0; |
697 | } | |
698 | ||
0be71e32 AW |
699 | void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd, |
700 | void *opaque) | |
9ed7d6ae | 701 | { |
1eb7538b JQ |
702 | SaveStateEntry *se, *new_se; |
703 | ||
0163a2e0 | 704 | QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
1eb7538b | 705 | if (se->vmsd == vmsd && se->opaque == opaque) { |
0163a2e0 | 706 | QTAILQ_REMOVE(&savevm_state.handlers, se, entry); |
ef1e1e07 | 707 | g_free(se->compat); |
7267c094 | 708 | g_free(se); |
1eb7538b JQ |
709 | } |
710 | } | |
9ed7d6ae JQ |
711 | } |
712 | ||
4082be4d JQ |
713 | static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id) |
714 | { | |
9013dca5 | 715 | trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
9ed7d6ae | 716 | if (!se->vmsd) { /* Old style */ |
22ea40f4 | 717 | return se->ops->load_state(f, se->opaque, version_id); |
9ed7d6ae JQ |
718 | } |
719 | return vmstate_load_state(f, se->vmsd, se->opaque, version_id); | |
4082be4d JQ |
720 | } |
721 | ||
8118f095 AG |
722 | static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) |
723 | { | |
724 | int64_t old_offset, size; | |
725 | ||
726 | old_offset = qemu_ftell_fast(f); | |
727 | se->ops->save_state(f, se->opaque); | |
728 | size = qemu_ftell_fast(f) - old_offset; | |
729 | ||
730 | if (vmdesc) { | |
731 | json_prop_int(vmdesc, "size", size); | |
732 | json_start_array(vmdesc, "fields"); | |
733 | json_start_object(vmdesc, NULL); | |
734 | json_prop_str(vmdesc, "name", "data"); | |
735 | json_prop_int(vmdesc, "size", size); | |
736 | json_prop_str(vmdesc, "type", "buffer"); | |
737 | json_end_object(vmdesc); | |
738 | json_end_array(vmdesc); | |
739 | } | |
740 | } | |
741 | ||
742 | static void vmstate_save(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) | |
4082be4d | 743 | { |
9013dca5 | 744 | trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
8118f095 AG |
745 | if (!se->vmsd) { |
746 | vmstate_save_old_style(f, se, vmdesc); | |
dc912121 | 747 | return; |
9ed7d6ae | 748 | } |
8118f095 | 749 | vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); |
4082be4d JQ |
750 | } |
751 | ||
37fb569c DDAG |
752 | void savevm_skip_section_footers(void) |
753 | { | |
754 | skip_section_footers = true; | |
755 | } | |
756 | ||
ce39bfc9 DDAG |
757 | /* |
758 | * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL) | |
759 | */ | |
760 | static void save_section_header(QEMUFile *f, SaveStateEntry *se, | |
761 | uint8_t section_type) | |
762 | { | |
763 | qemu_put_byte(f, section_type); | |
764 | qemu_put_be32(f, se->section_id); | |
765 | ||
766 | if (section_type == QEMU_VM_SECTION_FULL || | |
767 | section_type == QEMU_VM_SECTION_START) { | |
768 | /* ID string */ | |
769 | size_t len = strlen(se->idstr); | |
770 | qemu_put_byte(f, len); | |
771 | qemu_put_buffer(f, (uint8_t *)se->idstr, len); | |
772 | ||
773 | qemu_put_be32(f, se->instance_id); | |
774 | qemu_put_be32(f, se->version_id); | |
775 | } | |
776 | } | |
777 | ||
f68945d4 DDAG |
778 | /* |
779 | * Write a footer onto device sections that catches cases misformatted device | |
780 | * sections. | |
781 | */ | |
782 | static void save_section_footer(QEMUFile *f, SaveStateEntry *se) | |
783 | { | |
784 | if (!skip_section_footers) { | |
785 | qemu_put_byte(f, QEMU_VM_SECTION_FOOTER); | |
786 | qemu_put_be32(f, se->section_id); | |
787 | } | |
788 | } | |
789 | ||
c76ca188 DDAG |
790 | /** |
791 | * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the | |
792 | * command and associated data. | |
793 | * | |
794 | * @f: File to send command on | |
795 | * @command: Command type to send | |
796 | * @len: Length of associated data | |
797 | * @data: Data associated with command. | |
798 | */ | |
799 | void qemu_savevm_command_send(QEMUFile *f, | |
800 | enum qemu_vm_cmd command, | |
801 | uint16_t len, | |
802 | uint8_t *data) | |
803 | { | |
804 | trace_savevm_command_send(command, len); | |
805 | qemu_put_byte(f, QEMU_VM_COMMAND); | |
806 | qemu_put_be16(f, (uint16_t)command); | |
807 | qemu_put_be16(f, len); | |
808 | qemu_put_buffer(f, data, len); | |
809 | qemu_fflush(f); | |
810 | } | |
811 | ||
2e37701e DDAG |
812 | void qemu_savevm_send_ping(QEMUFile *f, uint32_t value) |
813 | { | |
814 | uint32_t buf; | |
815 | ||
816 | trace_savevm_send_ping(value); | |
817 | buf = cpu_to_be32(value); | |
818 | qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf); | |
819 | } | |
820 | ||
821 | void qemu_savevm_send_open_return_path(QEMUFile *f) | |
822 | { | |
823 | trace_savevm_send_open_return_path(); | |
824 | qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL); | |
825 | } | |
826 | ||
11cf1d98 DDAG |
827 | /* We have a buffer of data to send; we don't want that all to be loaded |
828 | * by the command itself, so the command contains just the length of the | |
829 | * extra buffer that we then send straight after it. | |
830 | * TODO: Must be a better way to organise that | |
831 | * | |
832 | * Returns: | |
833 | * 0 on success | |
834 | * -ve on error | |
835 | */ | |
61b67d47 | 836 | int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len) |
11cf1d98 | 837 | { |
11cf1d98 DDAG |
838 | uint32_t tmp; |
839 | ||
840 | if (len > MAX_VM_CMD_PACKAGED_SIZE) { | |
841 | error_report("%s: Unreasonably large packaged state: %zu", | |
842 | __func__, len); | |
843 | return -1; | |
844 | } | |
845 | ||
846 | tmp = cpu_to_be32(len); | |
847 | ||
848 | trace_qemu_savevm_send_packaged(); | |
849 | qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp); | |
850 | ||
61b67d47 | 851 | qemu_put_buffer(f, buf, len); |
11cf1d98 DDAG |
852 | |
853 | return 0; | |
854 | } | |
855 | ||
093e3c42 DDAG |
856 | /* Send prior to any postcopy transfer */ |
857 | void qemu_savevm_send_postcopy_advise(QEMUFile *f) | |
858 | { | |
859 | uint64_t tmp[2]; | |
860 | tmp[0] = cpu_to_be64(getpagesize()); | |
861 | tmp[1] = cpu_to_be64(1ul << qemu_target_page_bits()); | |
862 | ||
863 | trace_qemu_savevm_send_postcopy_advise(); | |
864 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 16, (uint8_t *)tmp); | |
865 | } | |
866 | ||
867 | /* Sent prior to starting the destination running in postcopy, discard pages | |
868 | * that have already been sent but redirtied on the source. | |
869 | * CMD_POSTCOPY_RAM_DISCARD consist of: | |
870 | * byte version (0) | |
871 | * byte Length of name field (not including 0) | |
872 | * n x byte RAM block name | |
873 | * byte 0 terminator (just for safety) | |
874 | * n x Byte ranges within the named RAMBlock | |
875 | * be64 Start of the range | |
876 | * be64 Length | |
877 | * | |
878 | * name: RAMBlock name that these entries are part of | |
879 | * len: Number of page entries | |
880 | * start_list: 'len' addresses | |
881 | * length_list: 'len' addresses | |
882 | * | |
883 | */ | |
884 | void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, | |
885 | uint16_t len, | |
886 | uint64_t *start_list, | |
887 | uint64_t *length_list) | |
888 | { | |
889 | uint8_t *buf; | |
890 | uint16_t tmplen; | |
891 | uint16_t t; | |
892 | size_t name_len = strlen(name); | |
893 | ||
894 | trace_qemu_savevm_send_postcopy_ram_discard(name, len); | |
895 | assert(name_len < 256); | |
896 | buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len); | |
897 | buf[0] = postcopy_ram_discard_version; | |
898 | buf[1] = name_len; | |
899 | memcpy(buf + 2, name, name_len); | |
900 | tmplen = 2 + name_len; | |
901 | buf[tmplen++] = '\0'; | |
902 | ||
903 | for (t = 0; t < len; t++) { | |
4d885131 | 904 | stq_be_p(buf + tmplen, start_list[t]); |
093e3c42 | 905 | tmplen += 8; |
4d885131 | 906 | stq_be_p(buf + tmplen, length_list[t]); |
093e3c42 DDAG |
907 | tmplen += 8; |
908 | } | |
909 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf); | |
910 | g_free(buf); | |
911 | } | |
912 | ||
913 | /* Get the destination into a state where it can receive postcopy data. */ | |
914 | void qemu_savevm_send_postcopy_listen(QEMUFile *f) | |
915 | { | |
916 | trace_savevm_send_postcopy_listen(); | |
917 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL); | |
918 | } | |
919 | ||
920 | /* Kick the destination into running */ | |
921 | void qemu_savevm_send_postcopy_run(QEMUFile *f) | |
922 | { | |
923 | trace_savevm_send_postcopy_run(); | |
924 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL); | |
925 | } | |
926 | ||
e1c37d0e | 927 | bool qemu_savevm_state_blocked(Error **errp) |
dc912121 AW |
928 | { |
929 | SaveStateEntry *se; | |
930 | ||
0163a2e0 | 931 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
7d854c47 | 932 | if (se->vmsd && se->vmsd->unmigratable) { |
f231b88d CR |
933 | error_setg(errp, "State blocked by non-migratable device '%s'", |
934 | se->idstr); | |
dc912121 AW |
935 | return true; |
936 | } | |
937 | } | |
938 | return false; | |
939 | } | |
940 | ||
902c053d GK |
941 | static bool enforce_config_section(void) |
942 | { | |
943 | MachineState *machine = MACHINE(qdev_get_machine()); | |
944 | return machine->enforce_config_section; | |
945 | } | |
946 | ||
f796baa1 DDAG |
947 | void qemu_savevm_state_header(QEMUFile *f) |
948 | { | |
949 | trace_savevm_state_header(); | |
950 | qemu_put_be32(f, QEMU_VM_FILE_MAGIC); | |
951 | qemu_put_be32(f, QEMU_VM_FILE_VERSION); | |
172dfd4f | 952 | |
902c053d | 953 | if (!savevm_state.skip_configuration || enforce_config_section()) { |
172dfd4f DDAG |
954 | qemu_put_byte(f, QEMU_VM_CONFIGURATION); |
955 | vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0); | |
956 | } | |
957 | ||
f796baa1 DDAG |
958 | } |
959 | ||
47c8c17a PB |
960 | void qemu_savevm_state_begin(QEMUFile *f, |
961 | const MigrationParams *params) | |
a672b469 AL |
962 | { |
963 | SaveStateEntry *se; | |
39346385 | 964 | int ret; |
a672b469 | 965 | |
9013dca5 | 966 | trace_savevm_state_begin(); |
0163a2e0 | 967 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
22ea40f4 | 968 | if (!se->ops || !se->ops->set_params) { |
c163b5ca | 969 | continue; |
6607ae23 | 970 | } |
22ea40f4 | 971 | se->ops->set_params(params, se->opaque); |
c163b5ca | 972 | } |
38ff78d3 | 973 | |
0163a2e0 | 974 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
d1315aac | 975 | if (!se->ops || !se->ops->save_live_setup) { |
a672b469 | 976 | continue; |
22ea40f4 | 977 | } |
6bd68781 JQ |
978 | if (se->ops && se->ops->is_active) { |
979 | if (!se->ops->is_active(se->opaque)) { | |
980 | continue; | |
981 | } | |
982 | } | |
ce39bfc9 | 983 | save_section_header(f, se, QEMU_VM_SECTION_START); |
a672b469 | 984 | |
d1315aac | 985 | ret = se->ops->save_live_setup(f, se->opaque); |
f68945d4 | 986 | save_section_footer(f, se); |
2975725f | 987 | if (ret < 0) { |
47c8c17a PB |
988 | qemu_file_set_error(f, ret); |
989 | break; | |
2975725f | 990 | } |
a672b469 | 991 | } |
a672b469 AL |
992 | } |
993 | ||
39346385 | 994 | /* |
07f35073 | 995 | * this function has three return values: |
39346385 JQ |
996 | * negative: there was one error, and we have -errno. |
997 | * 0 : We haven't finished, caller have to go again | |
998 | * 1 : We have finished, we can go to complete phase | |
999 | */ | |
35ecd943 | 1000 | int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) |
a672b469 AL |
1001 | { |
1002 | SaveStateEntry *se; | |
1003 | int ret = 1; | |
1004 | ||
9013dca5 | 1005 | trace_savevm_state_iterate(); |
0163a2e0 | 1006 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
16310a3c | 1007 | if (!se->ops || !se->ops->save_live_iterate) { |
a672b469 | 1008 | continue; |
22ea40f4 | 1009 | } |
6bd68781 JQ |
1010 | if (se->ops && se->ops->is_active) { |
1011 | if (!se->ops->is_active(se->opaque)) { | |
1012 | continue; | |
1013 | } | |
1014 | } | |
35ecd943 DDAG |
1015 | /* |
1016 | * In the postcopy phase, any device that doesn't know how to | |
1017 | * do postcopy should have saved it's state in the _complete | |
1018 | * call that's already run, it might get confused if we call | |
1019 | * iterate afterwards. | |
1020 | */ | |
1021 | if (postcopy && !se->ops->save_live_complete_postcopy) { | |
1022 | continue; | |
1023 | } | |
aac844ed JQ |
1024 | if (qemu_file_rate_limit(f)) { |
1025 | return 0; | |
1026 | } | |
464400f6 | 1027 | trace_savevm_section_start(se->idstr, se->section_id); |
ce39bfc9 DDAG |
1028 | |
1029 | save_section_header(f, se, QEMU_VM_SECTION_PART); | |
a672b469 | 1030 | |
16310a3c | 1031 | ret = se->ops->save_live_iterate(f, se->opaque); |
a5df2a02 | 1032 | trace_savevm_section_end(se->idstr, se->section_id, ret); |
f68945d4 | 1033 | save_section_footer(f, se); |
517a13c9 | 1034 | |
47c8c17a PB |
1035 | if (ret < 0) { |
1036 | qemu_file_set_error(f, ret); | |
1037 | } | |
2975725f | 1038 | if (ret <= 0) { |
90697be8 JK |
1039 | /* Do not proceed to the next vmstate before this one reported |
1040 | completion of the current stage. This serializes the migration | |
1041 | and reduces the probability that a faster changing state is | |
1042 | synchronized over and over again. */ | |
1043 | break; | |
1044 | } | |
a672b469 | 1045 | } |
39346385 | 1046 | return ret; |
a672b469 AL |
1047 | } |
1048 | ||
9850c604 AG |
1049 | static bool should_send_vmdesc(void) |
1050 | { | |
1051 | MachineState *machine = MACHINE(qdev_get_machine()); | |
8421b205 DDAG |
1052 | bool in_postcopy = migration_in_postcopy(migrate_get_current()); |
1053 | return !machine->suppress_vmdesc && !in_postcopy; | |
9850c604 AG |
1054 | } |
1055 | ||
763c906b DDAG |
1056 | /* |
1057 | * Calls the save_live_complete_postcopy methods | |
1058 | * causing the last few pages to be sent immediately and doing any associated | |
1059 | * cleanup. | |
1060 | * Note postcopy also calls qemu_savevm_state_complete_precopy to complete | |
1061 | * all the other devices, but that happens at the point we switch to postcopy. | |
1062 | */ | |
1063 | void qemu_savevm_state_complete_postcopy(QEMUFile *f) | |
1064 | { | |
1065 | SaveStateEntry *se; | |
1066 | int ret; | |
1067 | ||
1068 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
1069 | if (!se->ops || !se->ops->save_live_complete_postcopy) { | |
1070 | continue; | |
1071 | } | |
1072 | if (se->ops && se->ops->is_active) { | |
1073 | if (!se->ops->is_active(se->opaque)) { | |
1074 | continue; | |
1075 | } | |
1076 | } | |
1077 | trace_savevm_section_start(se->idstr, se->section_id); | |
1078 | /* Section type */ | |
1079 | qemu_put_byte(f, QEMU_VM_SECTION_END); | |
1080 | qemu_put_be32(f, se->section_id); | |
1081 | ||
1082 | ret = se->ops->save_live_complete_postcopy(f, se->opaque); | |
1083 | trace_savevm_section_end(se->idstr, se->section_id, ret); | |
1084 | save_section_footer(f, se); | |
1085 | if (ret < 0) { | |
1086 | qemu_file_set_error(f, ret); | |
1087 | return; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | qemu_put_byte(f, QEMU_VM_EOF); | |
1092 | qemu_fflush(f); | |
1093 | } | |
1094 | ||
1c0d249d | 1095 | void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) |
a672b469 | 1096 | { |
8118f095 AG |
1097 | QJSON *vmdesc; |
1098 | int vmdesc_len; | |
a672b469 | 1099 | SaveStateEntry *se; |
2975725f | 1100 | int ret; |
763c906b | 1101 | bool in_postcopy = migration_in_postcopy(migrate_get_current()); |
a672b469 | 1102 | |
a3e06c3d | 1103 | trace_savevm_state_complete_precopy(); |
9013dca5 | 1104 | |
ea375f9a JK |
1105 | cpu_synchronize_all_states(); |
1106 | ||
0163a2e0 | 1107 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
763c906b DDAG |
1108 | if (!se->ops || |
1109 | (in_postcopy && se->ops->save_live_complete_postcopy) || | |
1c0d249d | 1110 | (in_postcopy && !iterable_only) || |
763c906b | 1111 | !se->ops->save_live_complete_precopy) { |
a672b469 | 1112 | continue; |
22ea40f4 | 1113 | } |
1c0d249d | 1114 | |
6bd68781 JQ |
1115 | if (se->ops && se->ops->is_active) { |
1116 | if (!se->ops->is_active(se->opaque)) { | |
1117 | continue; | |
1118 | } | |
1119 | } | |
464400f6 | 1120 | trace_savevm_section_start(se->idstr, se->section_id); |
ce39bfc9 DDAG |
1121 | |
1122 | save_section_header(f, se, QEMU_VM_SECTION_END); | |
a672b469 | 1123 | |
a3e06c3d | 1124 | ret = se->ops->save_live_complete_precopy(f, se->opaque); |
a5df2a02 | 1125 | trace_savevm_section_end(se->idstr, se->section_id, ret); |
f68945d4 | 1126 | save_section_footer(f, se); |
2975725f | 1127 | if (ret < 0) { |
47c8c17a PB |
1128 | qemu_file_set_error(f, ret); |
1129 | return; | |
2975725f | 1130 | } |
a672b469 AL |
1131 | } |
1132 | ||
1c0d249d DDAG |
1133 | if (iterable_only) { |
1134 | return; | |
1135 | } | |
1136 | ||
8118f095 AG |
1137 | vmdesc = qjson_new(); |
1138 | json_prop_int(vmdesc, "page_size", TARGET_PAGE_SIZE); | |
1139 | json_start_array(vmdesc, "devices"); | |
0163a2e0 | 1140 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
a672b469 | 1141 | |
22ea40f4 | 1142 | if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
5cecf414 | 1143 | continue; |
22ea40f4 | 1144 | } |
df896152 JQ |
1145 | if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
1146 | trace_savevm_section_skip(se->idstr, se->section_id); | |
1147 | continue; | |
1148 | } | |
1149 | ||
464400f6 | 1150 | trace_savevm_section_start(se->idstr, se->section_id); |
8118f095 AG |
1151 | |
1152 | json_start_object(vmdesc, NULL); | |
1153 | json_prop_str(vmdesc, "name", se->idstr); | |
1154 | json_prop_int(vmdesc, "instance_id", se->instance_id); | |
1155 | ||
ce39bfc9 | 1156 | save_section_header(f, se, QEMU_VM_SECTION_FULL); |
8118f095 | 1157 | vmstate_save(f, se, vmdesc); |
a5df2a02 | 1158 | trace_savevm_section_end(se->idstr, se->section_id, 0); |
f68945d4 | 1159 | save_section_footer(f, se); |
bdf46d64 WY |
1160 | |
1161 | json_end_object(vmdesc); | |
a672b469 AL |
1162 | } |
1163 | ||
763c906b DDAG |
1164 | if (!in_postcopy) { |
1165 | /* Postcopy stream will still be going */ | |
1166 | qemu_put_byte(f, QEMU_VM_EOF); | |
1167 | } | |
8118f095 AG |
1168 | |
1169 | json_end_array(vmdesc); | |
1170 | qjson_finish(vmdesc); | |
1171 | vmdesc_len = strlen(qjson_get_str(vmdesc)); | |
1172 | ||
9850c604 AG |
1173 | if (should_send_vmdesc()) { |
1174 | qemu_put_byte(f, QEMU_VM_VMDESCRIPTION); | |
1175 | qemu_put_be32(f, vmdesc_len); | |
1176 | qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len); | |
1177 | } | |
b72fe9e6 | 1178 | qjson_destroy(vmdesc); |
8118f095 | 1179 | |
edaae611 | 1180 | qemu_fflush(f); |
a672b469 AL |
1181 | } |
1182 | ||
c31b098f DDAG |
1183 | /* Give an estimate of the amount left to be transferred, |
1184 | * the result is split into the amount for units that can and | |
1185 | * for units that can't do postcopy. | |
1186 | */ | |
1187 | void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size, | |
1188 | uint64_t *res_non_postcopiable, | |
1189 | uint64_t *res_postcopiable) | |
e4ed1541 JQ |
1190 | { |
1191 | SaveStateEntry *se; | |
c31b098f DDAG |
1192 | |
1193 | *res_non_postcopiable = 0; | |
1194 | *res_postcopiable = 0; | |
1195 | ||
e4ed1541 | 1196 | |
0163a2e0 | 1197 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
e4ed1541 JQ |
1198 | if (!se->ops || !se->ops->save_live_pending) { |
1199 | continue; | |
1200 | } | |
1201 | if (se->ops && se->ops->is_active) { | |
1202 | if (!se->ops->is_active(se->opaque)) { | |
1203 | continue; | |
1204 | } | |
1205 | } | |
c31b098f DDAG |
1206 | se->ops->save_live_pending(f, se->opaque, max_size, |
1207 | res_non_postcopiable, res_postcopiable); | |
e4ed1541 | 1208 | } |
e4ed1541 JQ |
1209 | } |
1210 | ||
ea7415fa | 1211 | void qemu_savevm_state_cleanup(void) |
4ec7fcc7 JK |
1212 | { |
1213 | SaveStateEntry *se; | |
1214 | ||
ea7415fa | 1215 | trace_savevm_state_cleanup(); |
0163a2e0 | 1216 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
d1a8548c LL |
1217 | if (se->ops && se->ops->cleanup) { |
1218 | se->ops->cleanup(se->opaque); | |
4ec7fcc7 JK |
1219 | } |
1220 | } | |
1221 | } | |
1222 | ||
5d80448c | 1223 | static int qemu_savevm_state(QEMUFile *f, Error **errp) |
a672b469 | 1224 | { |
a672b469 | 1225 | int ret; |
6607ae23 IY |
1226 | MigrationParams params = { |
1227 | .blk = 0, | |
1228 | .shared = 0 | |
1229 | }; | |
aefeb18b | 1230 | MigrationState *ms = migrate_init(¶ms); |
6dcf6668 | 1231 | MigrationStatus status; |
89a02a9f | 1232 | ms->to_dst_file = f; |
a672b469 | 1233 | |
24f3902b | 1234 | if (migration_is_blocked(errp)) { |
6dcf6668 DL |
1235 | ret = -EINVAL; |
1236 | goto done; | |
dc912121 AW |
1237 | } |
1238 | ||
9b095037 | 1239 | qemu_mutex_unlock_iothread(); |
f796baa1 | 1240 | qemu_savevm_state_header(f); |
47c8c17a | 1241 | qemu_savevm_state_begin(f, ¶ms); |
9b095037 PB |
1242 | qemu_mutex_lock_iothread(); |
1243 | ||
47c8c17a | 1244 | while (qemu_file_get_error(f) == 0) { |
35ecd943 | 1245 | if (qemu_savevm_state_iterate(f, false) > 0) { |
47c8c17a PB |
1246 | break; |
1247 | } | |
1248 | } | |
a672b469 | 1249 | |
47c8c17a | 1250 | ret = qemu_file_get_error(f); |
39346385 | 1251 | if (ret == 0) { |
1c0d249d | 1252 | qemu_savevm_state_complete_precopy(f, false); |
624b9cc2 | 1253 | ret = qemu_file_get_error(f); |
39346385 | 1254 | } |
15b3b8ea | 1255 | qemu_savevm_state_cleanup(); |
04943eba | 1256 | if (ret != 0) { |
5d80448c | 1257 | error_setg_errno(errp, -ret, "Error while writing VM state"); |
04943eba | 1258 | } |
6dcf6668 DL |
1259 | |
1260 | done: | |
1261 | if (ret != 0) { | |
1262 | status = MIGRATION_STATUS_FAILED; | |
1263 | } else { | |
1264 | status = MIGRATION_STATUS_COMPLETED; | |
1265 | } | |
1266 | migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP, status); | |
a672b469 AL |
1267 | return ret; |
1268 | } | |
1269 | ||
a7ae8355 SS |
1270 | static int qemu_save_device_state(QEMUFile *f) |
1271 | { | |
1272 | SaveStateEntry *se; | |
1273 | ||
1274 | qemu_put_be32(f, QEMU_VM_FILE_MAGIC); | |
1275 | qemu_put_be32(f, QEMU_VM_FILE_VERSION); | |
1276 | ||
1277 | cpu_synchronize_all_states(); | |
1278 | ||
0163a2e0 | 1279 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
a7ae8355 SS |
1280 | if (se->is_ram) { |
1281 | continue; | |
1282 | } | |
22ea40f4 | 1283 | if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
a7ae8355 SS |
1284 | continue; |
1285 | } | |
df896152 JQ |
1286 | if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
1287 | continue; | |
1288 | } | |
a7ae8355 | 1289 | |
ce39bfc9 | 1290 | save_section_header(f, se, QEMU_VM_SECTION_FULL); |
a7ae8355 | 1291 | |
8118f095 | 1292 | vmstate_save(f, se, NULL); |
f68945d4 DDAG |
1293 | |
1294 | save_section_footer(f, se); | |
a7ae8355 SS |
1295 | } |
1296 | ||
1297 | qemu_put_byte(f, QEMU_VM_EOF); | |
1298 | ||
1299 | return qemu_file_get_error(f); | |
1300 | } | |
1301 | ||
a672b469 AL |
1302 | static SaveStateEntry *find_se(const char *idstr, int instance_id) |
1303 | { | |
1304 | SaveStateEntry *se; | |
1305 | ||
0163a2e0 | 1306 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
a672b469 | 1307 | if (!strcmp(se->idstr, idstr) && |
4d2ffa08 JK |
1308 | (instance_id == se->instance_id || |
1309 | instance_id == se->alias_id)) | |
a672b469 | 1310 | return se; |
7685ee6a AW |
1311 | /* Migrating from an older version? */ |
1312 | if (strstr(se->idstr, idstr) && se->compat) { | |
1313 | if (!strcmp(se->compat->idstr, idstr) && | |
1314 | (instance_id == se->compat->instance_id || | |
1315 | instance_id == se->alias_id)) | |
1316 | return se; | |
1317 | } | |
a672b469 AL |
1318 | } |
1319 | return NULL; | |
1320 | } | |
1321 | ||
7b89bf27 DDAG |
1322 | enum LoadVMExitCodes { |
1323 | /* Allow a command to quit all layers of nested loadvm loops */ | |
1324 | LOADVM_QUIT = 1, | |
1325 | }; | |
1326 | ||
1327 | static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis); | |
093e3c42 DDAG |
1328 | |
1329 | /* ------ incoming postcopy messages ------ */ | |
1330 | /* 'advise' arrives before any transfers just to tell us that a postcopy | |
1331 | * *might* happen - it might be skipped if precopy transferred everything | |
1332 | * quickly. | |
1333 | */ | |
1334 | static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis) | |
1335 | { | |
1336 | PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE); | |
1337 | uint64_t remote_hps, remote_tps; | |
1338 | ||
1339 | trace_loadvm_postcopy_handle_advise(); | |
1340 | if (ps != POSTCOPY_INCOMING_NONE) { | |
1341 | error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps); | |
1342 | return -1; | |
1343 | } | |
1344 | ||
eb59db53 DDAG |
1345 | if (!postcopy_ram_supported_by_host()) { |
1346 | return -1; | |
1347 | } | |
1348 | ||
093e3c42 DDAG |
1349 | remote_hps = qemu_get_be64(mis->from_src_file); |
1350 | if (remote_hps != getpagesize()) { | |
1351 | /* | |
1352 | * Some combinations of mismatch are probably possible but it gets | |
1353 | * a bit more complicated. In particular we need to place whole | |
1354 | * host pages on the dest at once, and we need to ensure that we | |
1355 | * handle dirtying to make sure we never end up sending part of | |
1356 | * a hostpage on it's own. | |
1357 | */ | |
1358 | error_report("Postcopy needs matching host page sizes (s=%d d=%d)", | |
1359 | (int)remote_hps, getpagesize()); | |
1360 | return -1; | |
1361 | } | |
1362 | ||
1363 | remote_tps = qemu_get_be64(mis->from_src_file); | |
1364 | if (remote_tps != (1ul << qemu_target_page_bits())) { | |
1365 | /* | |
1366 | * Again, some differences could be dealt with, but for now keep it | |
1367 | * simple. | |
1368 | */ | |
1369 | error_report("Postcopy needs matching target page sizes (s=%d d=%d)", | |
1370 | (int)remote_tps, 1 << qemu_target_page_bits()); | |
1371 | return -1; | |
1372 | } | |
1373 | ||
1caddf8a DDAG |
1374 | if (ram_postcopy_incoming_init(mis)) { |
1375 | return -1; | |
1376 | } | |
1377 | ||
1378 | postcopy_state_set(POSTCOPY_INCOMING_ADVISE); | |
1379 | ||
093e3c42 DDAG |
1380 | return 0; |
1381 | } | |
1382 | ||
1383 | /* After postcopy we will be told to throw some pages away since they're | |
1384 | * dirty and will have to be demand fetched. Must happen before CPU is | |
1385 | * started. | |
1386 | * There can be 0..many of these messages, each encoding multiple pages. | |
1387 | */ | |
1388 | static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis, | |
1389 | uint16_t len) | |
1390 | { | |
1391 | int tmp; | |
1392 | char ramid[256]; | |
1393 | PostcopyState ps = postcopy_state_get(); | |
1394 | ||
1395 | trace_loadvm_postcopy_ram_handle_discard(); | |
1396 | ||
1397 | switch (ps) { | |
1398 | case POSTCOPY_INCOMING_ADVISE: | |
1399 | /* 1st discard */ | |
f9527107 | 1400 | tmp = postcopy_ram_prepare_discard(mis); |
093e3c42 DDAG |
1401 | if (tmp) { |
1402 | return tmp; | |
1403 | } | |
1404 | break; | |
1405 | ||
1406 | case POSTCOPY_INCOMING_DISCARD: | |
1407 | /* Expected state */ | |
1408 | break; | |
1409 | ||
1410 | default: | |
1411 | error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)", | |
1412 | ps); | |
1413 | return -1; | |
1414 | } | |
1415 | /* We're expecting a | |
1416 | * Version (0) | |
1417 | * a RAM ID string (length byte, name, 0 term) | |
1418 | * then at least 1 16 byte chunk | |
1419 | */ | |
1420 | if (len < (1 + 1 + 1 + 1 + 2 * 8)) { | |
1421 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); | |
1422 | return -1; | |
1423 | } | |
1424 | ||
1425 | tmp = qemu_get_byte(mis->from_src_file); | |
1426 | if (tmp != postcopy_ram_discard_version) { | |
1427 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp); | |
1428 | return -1; | |
1429 | } | |
1430 | ||
1431 | if (!qemu_get_counted_string(mis->from_src_file, ramid)) { | |
1432 | error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID"); | |
1433 | return -1; | |
1434 | } | |
1435 | tmp = qemu_get_byte(mis->from_src_file); | |
1436 | if (tmp != 0) { | |
1437 | error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp); | |
1438 | return -1; | |
1439 | } | |
1440 | ||
1441 | len -= 3 + strlen(ramid); | |
1442 | if (len % 16) { | |
1443 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); | |
1444 | return -1; | |
1445 | } | |
1446 | trace_loadvm_postcopy_ram_handle_discard_header(ramid, len); | |
1447 | while (len) { | |
093e3c42 DDAG |
1448 | uint64_t start_addr, block_length; |
1449 | start_addr = qemu_get_be64(mis->from_src_file); | |
1450 | block_length = qemu_get_be64(mis->from_src_file); | |
1451 | ||
1452 | len -= 16; | |
1453 | int ret = ram_discard_range(mis, ramid, start_addr, | |
1454 | block_length); | |
1455 | if (ret) { | |
1456 | return ret; | |
1457 | } | |
093e3c42 DDAG |
1458 | } |
1459 | trace_loadvm_postcopy_ram_handle_discard_end(); | |
1460 | ||
1461 | return 0; | |
1462 | } | |
1463 | ||
c76201ab DDAG |
1464 | /* |
1465 | * Triggered by a postcopy_listen command; this thread takes over reading | |
1466 | * the input stream, leaving the main thread free to carry on loading the rest | |
1467 | * of the device state (from RAM). | |
1468 | * (TODO:This could do with being in a postcopy file - but there again it's | |
1469 | * just another input loop, not that postcopy specific) | |
1470 | */ | |
1471 | static void *postcopy_ram_listen_thread(void *opaque) | |
1472 | { | |
1473 | QEMUFile *f = opaque; | |
1474 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1475 | int load_res; | |
1476 | ||
6ba996bb DDAG |
1477 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
1478 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
c76201ab DDAG |
1479 | qemu_sem_post(&mis->listen_thread_sem); |
1480 | trace_postcopy_ram_listen_thread_start(); | |
1481 | ||
1482 | /* | |
1483 | * Because we're a thread and not a coroutine we can't yield | |
1484 | * in qemu_file, and thus we must be blocking now. | |
1485 | */ | |
1486 | qemu_file_set_blocking(f, true); | |
1487 | load_res = qemu_loadvm_state_main(f, mis); | |
1488 | /* And non-blocking again so we don't block in any cleanup */ | |
1489 | qemu_file_set_blocking(f, false); | |
1490 | ||
1491 | trace_postcopy_ram_listen_thread_exit(); | |
1492 | if (load_res < 0) { | |
1493 | error_report("%s: loadvm failed: %d", __func__, load_res); | |
1494 | qemu_file_set_error(f, load_res); | |
6ba996bb DDAG |
1495 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1496 | MIGRATION_STATUS_FAILED); | |
c76201ab DDAG |
1497 | } else { |
1498 | /* | |
1499 | * This looks good, but it's possible that the device loading in the | |
1500 | * main thread hasn't finished yet, and so we might not be in 'RUN' | |
1501 | * state yet; wait for the end of the main thread. | |
1502 | */ | |
1503 | qemu_event_wait(&mis->main_thread_load_event); | |
1504 | } | |
1505 | postcopy_ram_incoming_cleanup(mis); | |
c76201ab DDAG |
1506 | |
1507 | if (load_res < 0) { | |
1508 | /* | |
1509 | * If something went wrong then we have a bad state so exit; | |
1510 | * depending how far we got it might be possible at this point | |
1511 | * to leave the guest running and fire MCEs for pages that never | |
1512 | * arrived as a desperate recovery step. | |
1513 | */ | |
1514 | exit(EXIT_FAILURE); | |
1515 | } | |
1516 | ||
6ba996bb DDAG |
1517 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1518 | MIGRATION_STATUS_COMPLETED); | |
1519 | /* | |
1520 | * If everything has worked fine, then the main thread has waited | |
1521 | * for us to start, and we're the last use of the mis. | |
1522 | * (If something broke then qemu will have to exit anyway since it's | |
1523 | * got a bad migration state). | |
1524 | */ | |
1525 | migration_incoming_state_destroy(); | |
1526 | ||
1527 | ||
c76201ab DDAG |
1528 | return NULL; |
1529 | } | |
1530 | ||
093e3c42 DDAG |
1531 | /* After this message we must be able to immediately receive postcopy data */ |
1532 | static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) | |
1533 | { | |
1534 | PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING); | |
1535 | trace_loadvm_postcopy_handle_listen(); | |
1536 | if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) { | |
1537 | error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps); | |
1538 | return -1; | |
1539 | } | |
f9527107 DDAG |
1540 | if (ps == POSTCOPY_INCOMING_ADVISE) { |
1541 | /* | |
1542 | * A rare case, we entered listen without having to do any discards, | |
1543 | * so do the setup that's normally done at the time of the 1st discard. | |
1544 | */ | |
1545 | postcopy_ram_prepare_discard(mis); | |
1546 | } | |
093e3c42 | 1547 | |
f0a227ad DDAG |
1548 | /* |
1549 | * Sensitise RAM - can now generate requests for blocks that don't exist | |
1550 | * However, at this point the CPU shouldn't be running, and the IO | |
1551 | * shouldn't be doing anything yet so don't actually expect requests | |
1552 | */ | |
1553 | if (postcopy_ram_enable_notify(mis)) { | |
1554 | return -1; | |
1555 | } | |
1556 | ||
c76201ab DDAG |
1557 | if (mis->have_listen_thread) { |
1558 | error_report("CMD_POSTCOPY_RAM_LISTEN already has a listen thread"); | |
1559 | return -1; | |
1560 | } | |
1561 | ||
1562 | mis->have_listen_thread = true; | |
1563 | /* Start up the listening thread and wait for it to signal ready */ | |
1564 | qemu_sem_init(&mis->listen_thread_sem, 0); | |
1565 | qemu_thread_create(&mis->listen_thread, "postcopy/listen", | |
1566 | postcopy_ram_listen_thread, mis->from_src_file, | |
a587a3fe | 1567 | QEMU_THREAD_DETACHED); |
c76201ab DDAG |
1568 | qemu_sem_wait(&mis->listen_thread_sem); |
1569 | qemu_sem_destroy(&mis->listen_thread_sem); | |
1570 | ||
093e3c42 DDAG |
1571 | return 0; |
1572 | } | |
1573 | ||
86469922 DL |
1574 | |
1575 | typedef struct { | |
1576 | QEMUBH *bh; | |
1577 | } HandleRunBhData; | |
1578 | ||
ea6a55bc | 1579 | static void loadvm_postcopy_handle_run_bh(void *opaque) |
093e3c42 | 1580 | { |
27c6825b | 1581 | Error *local_err = NULL; |
86469922 | 1582 | HandleRunBhData *data = opaque; |
093e3c42 | 1583 | |
27c6825b DDAG |
1584 | /* TODO we should move all of this lot into postcopy_ram.c or a shared code |
1585 | * in migration.c | |
1586 | */ | |
1587 | cpu_synchronize_all_post_init(); | |
1588 | ||
1589 | qemu_announce_self(); | |
1590 | ||
1591 | /* Make sure all file formats flush their mutable metadata */ | |
1592 | bdrv_invalidate_cache_all(&local_err); | |
1593 | if (local_err) { | |
1594 | error_report_err(local_err); | |
27c6825b DDAG |
1595 | } |
1596 | ||
1597 | trace_loadvm_postcopy_handle_run_cpu_sync(); | |
1598 | cpu_synchronize_all_post_init(); | |
1599 | ||
1600 | trace_loadvm_postcopy_handle_run_vmstart(); | |
1601 | ||
093e3c42 DDAG |
1602 | if (autostart) { |
1603 | /* Hold onto your hats, starting the CPU */ | |
1604 | vm_start(); | |
1605 | } else { | |
1606 | /* leave it paused and let management decide when to start the CPU */ | |
1607 | runstate_set(RUN_STATE_PAUSED); | |
1608 | } | |
1609 | ||
86469922 DL |
1610 | qemu_bh_delete(data->bh); |
1611 | g_free(data); | |
ea6a55bc DL |
1612 | } |
1613 | ||
1614 | /* After all discards we can start running and asking for pages */ | |
1615 | static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) | |
1616 | { | |
1617 | PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING); | |
86469922 | 1618 | HandleRunBhData *data; |
ea6a55bc DL |
1619 | |
1620 | trace_loadvm_postcopy_handle_run(); | |
1621 | if (ps != POSTCOPY_INCOMING_LISTENING) { | |
1622 | error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps); | |
1623 | return -1; | |
1624 | } | |
1625 | ||
86469922 DL |
1626 | data = g_new(HandleRunBhData, 1); |
1627 | data->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, data); | |
1628 | qemu_bh_schedule(data->bh); | |
ea6a55bc | 1629 | |
27c6825b DDAG |
1630 | /* We need to finish reading the stream from the package |
1631 | * and also stop reading anything more from the stream that loaded the | |
1632 | * package (since it's now being read by the listener thread). | |
1633 | * LOADVM_QUIT will quit all the layers of nested loadvm loops. | |
1634 | */ | |
1635 | return LOADVM_QUIT; | |
093e3c42 DDAG |
1636 | } |
1637 | ||
c76ca188 | 1638 | /** |
11cf1d98 DDAG |
1639 | * Immediately following this command is a blob of data containing an embedded |
1640 | * chunk of migration stream; read it and load it. | |
1641 | * | |
1642 | * @mis: Incoming state | |
1643 | * @length: Length of packaged data to read | |
c76ca188 | 1644 | * |
11cf1d98 DDAG |
1645 | * Returns: Negative values on error |
1646 | * | |
1647 | */ | |
1648 | static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis) | |
1649 | { | |
1650 | int ret; | |
61b67d47 DB |
1651 | size_t length; |
1652 | QIOChannelBuffer *bioc; | |
11cf1d98 DDAG |
1653 | |
1654 | length = qemu_get_be32(mis->from_src_file); | |
1655 | trace_loadvm_handle_cmd_packaged(length); | |
1656 | ||
1657 | if (length > MAX_VM_CMD_PACKAGED_SIZE) { | |
61b67d47 | 1658 | error_report("Unreasonably large packaged state: %zu", length); |
11cf1d98 DDAG |
1659 | return -1; |
1660 | } | |
61b67d47 DB |
1661 | |
1662 | bioc = qio_channel_buffer_new(length); | |
6f01f136 | 1663 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-loadvm-buffer"); |
61b67d47 DB |
1664 | ret = qemu_get_buffer(mis->from_src_file, |
1665 | bioc->data, | |
1666 | length); | |
11cf1d98 | 1667 | if (ret != length) { |
61b67d47 DB |
1668 | object_unref(OBJECT(bioc)); |
1669 | error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%zu", | |
9af9e0fe | 1670 | ret, length); |
11cf1d98 DDAG |
1671 | return (ret < 0) ? ret : -EAGAIN; |
1672 | } | |
61b67d47 | 1673 | bioc->usage += length; |
11cf1d98 DDAG |
1674 | trace_loadvm_handle_cmd_packaged_received(ret); |
1675 | ||
61b67d47 | 1676 | QEMUFile *packf = qemu_fopen_channel_input(QIO_CHANNEL(bioc)); |
11cf1d98 DDAG |
1677 | |
1678 | ret = qemu_loadvm_state_main(packf, mis); | |
1679 | trace_loadvm_handle_cmd_packaged_main(ret); | |
1680 | qemu_fclose(packf); | |
61b67d47 | 1681 | object_unref(OBJECT(bioc)); |
11cf1d98 DDAG |
1682 | |
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | /* | |
1687 | * Process an incoming 'QEMU_VM_COMMAND' | |
1688 | * 0 just a normal return | |
1689 | * LOADVM_QUIT All good, but exit the loop | |
1690 | * <0 Error | |
c76ca188 DDAG |
1691 | */ |
1692 | static int loadvm_process_command(QEMUFile *f) | |
1693 | { | |
2e37701e | 1694 | MigrationIncomingState *mis = migration_incoming_get_current(); |
c76ca188 DDAG |
1695 | uint16_t cmd; |
1696 | uint16_t len; | |
2e37701e | 1697 | uint32_t tmp32; |
c76ca188 DDAG |
1698 | |
1699 | cmd = qemu_get_be16(f); | |
1700 | len = qemu_get_be16(f); | |
1701 | ||
1702 | trace_loadvm_process_command(cmd, len); | |
1703 | if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) { | |
1704 | error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len); | |
1705 | return -EINVAL; | |
1706 | } | |
1707 | ||
1708 | if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) { | |
1709 | error_report("%s received with bad length - expecting %zu, got %d", | |
1710 | mig_cmd_args[cmd].name, | |
1711 | (size_t)mig_cmd_args[cmd].len, len); | |
1712 | return -ERANGE; | |
1713 | } | |
1714 | ||
1715 | switch (cmd) { | |
2e37701e DDAG |
1716 | case MIG_CMD_OPEN_RETURN_PATH: |
1717 | if (mis->to_src_file) { | |
1718 | error_report("CMD_OPEN_RETURN_PATH called when RP already open"); | |
1719 | /* Not really a problem, so don't give up */ | |
1720 | return 0; | |
1721 | } | |
1722 | mis->to_src_file = qemu_file_get_return_path(f); | |
1723 | if (!mis->to_src_file) { | |
1724 | error_report("CMD_OPEN_RETURN_PATH failed"); | |
1725 | return -1; | |
1726 | } | |
1727 | break; | |
1728 | ||
1729 | case MIG_CMD_PING: | |
1730 | tmp32 = qemu_get_be32(f); | |
1731 | trace_loadvm_process_command_ping(tmp32); | |
1732 | if (!mis->to_src_file) { | |
1733 | error_report("CMD_PING (0x%x) received with no return path", | |
1734 | tmp32); | |
1735 | return -1; | |
1736 | } | |
6decec93 | 1737 | migrate_send_rp_pong(mis, tmp32); |
2e37701e | 1738 | break; |
093e3c42 | 1739 | |
11cf1d98 DDAG |
1740 | case MIG_CMD_PACKAGED: |
1741 | return loadvm_handle_cmd_packaged(mis); | |
1742 | ||
093e3c42 DDAG |
1743 | case MIG_CMD_POSTCOPY_ADVISE: |
1744 | return loadvm_postcopy_handle_advise(mis); | |
1745 | ||
1746 | case MIG_CMD_POSTCOPY_LISTEN: | |
1747 | return loadvm_postcopy_handle_listen(mis); | |
1748 | ||
1749 | case MIG_CMD_POSTCOPY_RUN: | |
1750 | return loadvm_postcopy_handle_run(mis); | |
1751 | ||
1752 | case MIG_CMD_POSTCOPY_RAM_DISCARD: | |
1753 | return loadvm_postcopy_ram_handle_discard(mis, len); | |
c76ca188 DDAG |
1754 | } |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | ||
1a8f46f8 | 1759 | struct LoadStateEntry { |
72cf2d4f | 1760 | QLIST_ENTRY(LoadStateEntry) entry; |
a672b469 AL |
1761 | SaveStateEntry *se; |
1762 | int section_id; | |
1763 | int version_id; | |
1a8f46f8 | 1764 | }; |
a672b469 | 1765 | |
59f39a47 DDAG |
1766 | /* |
1767 | * Read a footer off the wire and check that it matches the expected section | |
1768 | * | |
1769 | * Returns: true if the footer was good | |
1770 | * false if there is a problem (and calls error_report to say why) | |
1771 | */ | |
1772 | static bool check_section_footer(QEMUFile *f, LoadStateEntry *le) | |
1773 | { | |
1774 | uint8_t read_mark; | |
1775 | uint32_t read_section_id; | |
1776 | ||
1777 | if (skip_section_footers) { | |
1778 | /* No footer to check */ | |
1779 | return true; | |
1780 | } | |
1781 | ||
1782 | read_mark = qemu_get_byte(f); | |
1783 | ||
1784 | if (read_mark != QEMU_VM_SECTION_FOOTER) { | |
1785 | error_report("Missing section footer for %s", le->se->idstr); | |
1786 | return false; | |
1787 | } | |
1788 | ||
1789 | read_section_id = qemu_get_be32(f); | |
1790 | if (read_section_id != le->section_id) { | |
1791 | error_report("Mismatched section id in footer for %s -" | |
1792 | " read 0x%x expected 0x%x", | |
1793 | le->se->idstr, read_section_id, le->section_id); | |
1794 | return false; | |
1795 | } | |
1796 | ||
1797 | /* All good */ | |
1798 | return true; | |
1799 | } | |
1800 | ||
1a8f46f8 | 1801 | void loadvm_free_handlers(MigrationIncomingState *mis) |
a672b469 | 1802 | { |
f4dbb8dd | 1803 | LoadStateEntry *le, *new_le; |
1a8f46f8 DDAG |
1804 | |
1805 | QLIST_FOREACH_SAFE(le, &mis->loadvm_handlers, entry, new_le) { | |
1806 | QLIST_REMOVE(le, entry); | |
1807 | g_free(le); | |
1808 | } | |
1809 | } | |
1810 | ||
fb3520a8 HZ |
1811 | static int |
1812 | qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis) | |
1813 | { | |
1814 | uint32_t instance_id, version_id, section_id; | |
1815 | SaveStateEntry *se; | |
1816 | LoadStateEntry *le; | |
1817 | char idstr[256]; | |
1818 | int ret; | |
1819 | ||
1820 | /* Read section start */ | |
1821 | section_id = qemu_get_be32(f); | |
1822 | if (!qemu_get_counted_string(f, idstr)) { | |
1823 | error_report("Unable to read ID string for section %u", | |
1824 | section_id); | |
1825 | return -EINVAL; | |
1826 | } | |
1827 | instance_id = qemu_get_be32(f); | |
1828 | version_id = qemu_get_be32(f); | |
1829 | ||
1830 | trace_qemu_loadvm_state_section_startfull(section_id, idstr, | |
1831 | instance_id, version_id); | |
1832 | /* Find savevm section */ | |
1833 | se = find_se(idstr, instance_id); | |
1834 | if (se == NULL) { | |
1835 | error_report("Unknown savevm section or instance '%s' %d", | |
1836 | idstr, instance_id); | |
1837 | return -EINVAL; | |
1838 | } | |
1839 | ||
1840 | /* Validate version */ | |
1841 | if (version_id > se->version_id) { | |
1842 | error_report("savevm: unsupported version %d for '%s' v%d", | |
1843 | version_id, idstr, se->version_id); | |
1844 | return -EINVAL; | |
1845 | } | |
1846 | ||
88c16567 WC |
1847 | /* Validate if it is a device's state */ |
1848 | if (xen_enabled() && se->is_ram) { | |
1849 | error_report("loadvm: %s RAM loading not allowed on Xen", idstr); | |
1850 | return -EINVAL; | |
1851 | } | |
1852 | ||
fb3520a8 HZ |
1853 | /* Add entry */ |
1854 | le = g_malloc0(sizeof(*le)); | |
1855 | ||
1856 | le->se = se; | |
1857 | le->section_id = section_id; | |
1858 | le->version_id = version_id; | |
1859 | QLIST_INSERT_HEAD(&mis->loadvm_handlers, le, entry); | |
1860 | ||
1861 | ret = vmstate_load(f, le->se, le->version_id); | |
1862 | if (ret < 0) { | |
1863 | error_report("error while loading state for instance 0x%x of" | |
1864 | " device '%s'", instance_id, idstr); | |
1865 | return ret; | |
1866 | } | |
1867 | if (!check_section_footer(f, le)) { | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | static int | |
1875 | qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis) | |
1876 | { | |
1877 | uint32_t section_id; | |
1878 | LoadStateEntry *le; | |
1879 | int ret; | |
1880 | ||
1881 | section_id = qemu_get_be32(f); | |
1882 | ||
1883 | trace_qemu_loadvm_state_section_partend(section_id); | |
1884 | QLIST_FOREACH(le, &mis->loadvm_handlers, entry) { | |
1885 | if (le->section_id == section_id) { | |
1886 | break; | |
1887 | } | |
1888 | } | |
1889 | if (le == NULL) { | |
1890 | error_report("Unknown savevm section %d", section_id); | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | ||
1894 | ret = vmstate_load(f, le->se, le->version_id); | |
1895 | if (ret < 0) { | |
1896 | error_report("error while loading state section id %d(%s)", | |
1897 | section_id, le->se->idstr); | |
1898 | return ret; | |
1899 | } | |
1900 | if (!check_section_footer(f, le)) { | |
1901 | return -EINVAL; | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
1906 | ||
7b89bf27 | 1907 | static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis) |
1a8f46f8 | 1908 | { |
a672b469 | 1909 | uint8_t section_type; |
ccb783c3 | 1910 | int ret = 0; |
61964c23 | 1911 | |
a672b469 | 1912 | while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) { |
ccb783c3 | 1913 | ret = 0; |
a5df2a02 | 1914 | trace_qemu_loadvm_state_section(section_type); |
a672b469 AL |
1915 | switch (section_type) { |
1916 | case QEMU_VM_SECTION_START: | |
1917 | case QEMU_VM_SECTION_FULL: | |
fb3520a8 | 1918 | ret = qemu_loadvm_section_start_full(f, mis); |
b5a22e4a | 1919 | if (ret < 0) { |
ccb783c3 | 1920 | goto out; |
b5a22e4a | 1921 | } |
a672b469 AL |
1922 | break; |
1923 | case QEMU_VM_SECTION_PART: | |
1924 | case QEMU_VM_SECTION_END: | |
fb3520a8 | 1925 | ret = qemu_loadvm_section_part_end(f, mis); |
b5a22e4a | 1926 | if (ret < 0) { |
ccb783c3 | 1927 | goto out; |
b5a22e4a | 1928 | } |
a672b469 | 1929 | break; |
c76ca188 DDAG |
1930 | case QEMU_VM_COMMAND: |
1931 | ret = loadvm_process_command(f); | |
7b89bf27 DDAG |
1932 | trace_qemu_loadvm_state_section_command(ret); |
1933 | if ((ret < 0) || (ret & LOADVM_QUIT)) { | |
ccb783c3 | 1934 | goto out; |
c76ca188 DDAG |
1935 | } |
1936 | break; | |
a672b469 | 1937 | default: |
6a64b644 | 1938 | error_report("Unknown savevm section type %d", section_type); |
ccb783c3 DDAG |
1939 | ret = -EINVAL; |
1940 | goto out; | |
a672b469 AL |
1941 | } |
1942 | } | |
1943 | ||
ccb783c3 DDAG |
1944 | out: |
1945 | if (ret < 0) { | |
1946 | qemu_file_set_error(f, ret); | |
1947 | } | |
1948 | return ret; | |
7b89bf27 DDAG |
1949 | } |
1950 | ||
1951 | int qemu_loadvm_state(QEMUFile *f) | |
1952 | { | |
1953 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1954 | Error *local_err = NULL; | |
1955 | unsigned int v; | |
1956 | int ret; | |
1957 | ||
1958 | if (qemu_savevm_state_blocked(&local_err)) { | |
1959 | error_report_err(local_err); | |
1960 | return -EINVAL; | |
1961 | } | |
1962 | ||
1963 | v = qemu_get_be32(f); | |
1964 | if (v != QEMU_VM_FILE_MAGIC) { | |
1965 | error_report("Not a migration stream"); | |
1966 | return -EINVAL; | |
1967 | } | |
1968 | ||
1969 | v = qemu_get_be32(f); | |
1970 | if (v == QEMU_VM_FILE_VERSION_COMPAT) { | |
1971 | error_report("SaveVM v2 format is obsolete and don't work anymore"); | |
1972 | return -ENOTSUP; | |
1973 | } | |
1974 | if (v != QEMU_VM_FILE_VERSION) { | |
1975 | error_report("Unsupported migration stream version"); | |
1976 | return -ENOTSUP; | |
1977 | } | |
1978 | ||
902c053d | 1979 | if (!savevm_state.skip_configuration || enforce_config_section()) { |
7b89bf27 DDAG |
1980 | if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) { |
1981 | error_report("Configuration section missing"); | |
1982 | return -EINVAL; | |
1983 | } | |
1984 | ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0); | |
1985 | ||
1986 | if (ret) { | |
1987 | return ret; | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | ret = qemu_loadvm_state_main(f, mis); | |
1992 | qemu_event_set(&mis->main_thread_load_event); | |
1993 | ||
1994 | trace_qemu_loadvm_state_post_main(ret); | |
1995 | ||
c76201ab DDAG |
1996 | if (mis->have_listen_thread) { |
1997 | /* Listen thread still going, can't clean up yet */ | |
1998 | return ret; | |
1999 | } | |
2000 | ||
7b89bf27 DDAG |
2001 | if (ret == 0) { |
2002 | ret = qemu_file_get_error(f); | |
2003 | } | |
1925cebc AG |
2004 | |
2005 | /* | |
2006 | * Try to read in the VMDESC section as well, so that dumping tools that | |
2007 | * intercept our migration stream have the chance to see it. | |
2008 | */ | |
1aca9a5f DDAG |
2009 | |
2010 | /* We've got to be careful; if we don't read the data and just shut the fd | |
2011 | * then the sender can error if we close while it's still sending. | |
2012 | * We also mustn't read data that isn't there; some transports (RDMA) | |
2013 | * will stall waiting for that data when the source has already closed. | |
2014 | */ | |
7b89bf27 | 2015 | if (ret == 0 && should_send_vmdesc()) { |
1aca9a5f DDAG |
2016 | uint8_t *buf; |
2017 | uint32_t size; | |
7b89bf27 | 2018 | uint8_t section_type = qemu_get_byte(f); |
1aca9a5f DDAG |
2019 | |
2020 | if (section_type != QEMU_VM_VMDESCRIPTION) { | |
2021 | error_report("Expected vmdescription section, but got %d", | |
2022 | section_type); | |
2023 | /* | |
2024 | * It doesn't seem worth failing at this point since | |
2025 | * we apparently have an otherwise valid VM state | |
2026 | */ | |
2027 | } else { | |
2028 | buf = g_malloc(0x1000); | |
2029 | size = qemu_get_be32(f); | |
2030 | ||
2031 | while (size > 0) { | |
2032 | uint32_t read_chunk = MIN(size, 0x1000); | |
2033 | qemu_get_buffer(f, buf, read_chunk); | |
2034 | size -= read_chunk; | |
2035 | } | |
2036 | g_free(buf); | |
1925cebc | 2037 | } |
1925cebc AG |
2038 | } |
2039 | ||
ea375f9a JK |
2040 | cpu_synchronize_all_post_init(); |
2041 | ||
a672b469 AL |
2042 | return ret; |
2043 | } | |
2044 | ||
3e5a50d6 | 2045 | void hmp_savevm(Monitor *mon, const QDict *qdict) |
a672b469 AL |
2046 | { |
2047 | BlockDriverState *bs, *bs1; | |
2048 | QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1; | |
cb499fb2 | 2049 | int ret; |
a672b469 AL |
2050 | QEMUFile *f; |
2051 | int saved_vm_running; | |
c2c9a466 | 2052 | uint64_t vm_state_size; |
68b891ec | 2053 | qemu_timeval tv; |
7d631a11 | 2054 | struct tm tm; |
d54908a5 | 2055 | const char *name = qdict_get_try_str(qdict, "name"); |
5d80448c | 2056 | Error *local_err = NULL; |
79b3c12a | 2057 | AioContext *aio_context; |
a672b469 | 2058 | |
e9ff957a DL |
2059 | if (!bdrv_all_can_snapshot(&bs)) { |
2060 | monitor_printf(mon, "Device '%s' is writable but does not " | |
2061 | "support snapshots.\n", bdrv_get_device_name(bs)); | |
2062 | return; | |
feeee5ac MDCF |
2063 | } |
2064 | ||
0b461605 DL |
2065 | /* Delete old snapshots of the same name */ |
2066 | if (name && bdrv_all_delete_snapshot(name, &bs1, &local_err) < 0) { | |
d410fe14 MA |
2067 | error_reportf_err(local_err, |
2068 | "Error while deleting snapshot on device '%s': ", | |
2069 | bdrv_get_device_name(bs1)); | |
0b461605 DL |
2070 | return; |
2071 | } | |
2072 | ||
7cb14481 DL |
2073 | bs = bdrv_all_find_vmstate_bs(); |
2074 | if (bs == NULL) { | |
376253ec | 2075 | monitor_printf(mon, "No block device can accept snapshots\n"); |
a672b469 AL |
2076 | return; |
2077 | } | |
79b3c12a | 2078 | aio_context = bdrv_get_aio_context(bs); |
a672b469 | 2079 | |
1354869c | 2080 | saved_vm_running = runstate_is_running(); |
560d027b JQ |
2081 | |
2082 | ret = global_state_store(); | |
2083 | if (ret) { | |
2084 | monitor_printf(mon, "Error saving global state\n"); | |
2085 | return; | |
2086 | } | |
0461d5a6 | 2087 | vm_stop(RUN_STATE_SAVE_VM); |
a672b469 | 2088 | |
79b3c12a DL |
2089 | aio_context_acquire(aio_context); |
2090 | ||
cb499fb2 | 2091 | memset(sn, 0, sizeof(*sn)); |
a672b469 AL |
2092 | |
2093 | /* fill auxiliary fields */ | |
68b891ec | 2094 | qemu_gettimeofday(&tv); |
a672b469 AL |
2095 | sn->date_sec = tv.tv_sec; |
2096 | sn->date_nsec = tv.tv_usec * 1000; | |
bc72ad67 | 2097 | sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
a672b469 | 2098 | |
7d631a11 MDCF |
2099 | if (name) { |
2100 | ret = bdrv_snapshot_find(bs, old_sn, name); | |
2101 | if (ret >= 0) { | |
2102 | pstrcpy(sn->name, sizeof(sn->name), old_sn->name); | |
2103 | pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str); | |
2104 | } else { | |
2105 | pstrcpy(sn->name, sizeof(sn->name), name); | |
2106 | } | |
2107 | } else { | |
d7d9b528 BS |
2108 | /* cast below needed for OpenBSD where tv_sec is still 'long' */ |
2109 | localtime_r((const time_t *)&tv.tv_sec, &tm); | |
7d631a11 | 2110 | strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm); |
7d631a11 MDCF |
2111 | } |
2112 | ||
a672b469 | 2113 | /* save the VM state */ |
45566e9c | 2114 | f = qemu_fopen_bdrv(bs, 1); |
a672b469 | 2115 | if (!f) { |
376253ec | 2116 | monitor_printf(mon, "Could not open VM state file\n"); |
a672b469 AL |
2117 | goto the_end; |
2118 | } | |
5d80448c | 2119 | ret = qemu_savevm_state(f, &local_err); |
2d22b18f | 2120 | vm_state_size = qemu_ftell(f); |
a672b469 AL |
2121 | qemu_fclose(f); |
2122 | if (ret < 0) { | |
193227f9 | 2123 | error_report_err(local_err); |
a672b469 AL |
2124 | goto the_end; |
2125 | } | |
2126 | ||
a9085f9b DL |
2127 | ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs); |
2128 | if (ret < 0) { | |
2129 | monitor_printf(mon, "Error while creating snapshot on '%s'\n", | |
2130 | bdrv_get_device_name(bs)); | |
a672b469 AL |
2131 | } |
2132 | ||
2133 | the_end: | |
79b3c12a | 2134 | aio_context_release(aio_context); |
38ff78d3 | 2135 | if (saved_vm_running) { |
a672b469 | 2136 | vm_start(); |
38ff78d3 | 2137 | } |
a672b469 AL |
2138 | } |
2139 | ||
a7ae8355 SS |
2140 | void qmp_xen_save_devices_state(const char *filename, Error **errp) |
2141 | { | |
2142 | QEMUFile *f; | |
8925839f | 2143 | QIOChannelFile *ioc; |
a7ae8355 SS |
2144 | int saved_vm_running; |
2145 | int ret; | |
2146 | ||
2147 | saved_vm_running = runstate_is_running(); | |
2148 | vm_stop(RUN_STATE_SAVE_VM); | |
c69adea4 | 2149 | global_state_store_running(); |
a7ae8355 | 2150 | |
8925839f DB |
2151 | ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT, 0660, errp); |
2152 | if (!ioc) { | |
a7ae8355 SS |
2153 | goto the_end; |
2154 | } | |
6f01f136 | 2155 | qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-save-state"); |
8925839f | 2156 | f = qemu_fopen_channel_output(QIO_CHANNEL(ioc)); |
a7ae8355 SS |
2157 | ret = qemu_save_device_state(f); |
2158 | qemu_fclose(f); | |
2159 | if (ret < 0) { | |
c6bd8c70 | 2160 | error_setg(errp, QERR_IO_ERROR); |
a7ae8355 SS |
2161 | } |
2162 | ||
2163 | the_end: | |
38ff78d3 | 2164 | if (saved_vm_running) { |
a7ae8355 | 2165 | vm_start(); |
38ff78d3 | 2166 | } |
a7ae8355 SS |
2167 | } |
2168 | ||
88c16567 WC |
2169 | void qmp_xen_load_devices_state(const char *filename, Error **errp) |
2170 | { | |
2171 | QEMUFile *f; | |
2172 | QIOChannelFile *ioc; | |
2173 | int ret; | |
2174 | ||
2175 | /* Guest must be paused before loading the device state; the RAM state | |
2176 | * will already have been loaded by xc | |
2177 | */ | |
2178 | if (runstate_is_running()) { | |
2179 | error_setg(errp, "Cannot update device state while vm is running"); | |
2180 | return; | |
2181 | } | |
2182 | vm_stop(RUN_STATE_RESTORE_VM); | |
2183 | ||
2184 | ioc = qio_channel_file_new_path(filename, O_RDONLY | O_BINARY, 0, errp); | |
2185 | if (!ioc) { | |
2186 | return; | |
2187 | } | |
6f01f136 | 2188 | qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-load-state"); |
88c16567 WC |
2189 | f = qemu_fopen_channel_input(QIO_CHANNEL(ioc)); |
2190 | ||
2191 | migration_incoming_state_new(f); | |
2192 | ret = qemu_loadvm_state(f); | |
2193 | qemu_fclose(f); | |
2194 | if (ret < 0) { | |
2195 | error_setg(errp, QERR_IO_ERROR); | |
2196 | } | |
2197 | migration_incoming_state_destroy(); | |
2198 | } | |
2199 | ||
03cd4655 | 2200 | int load_vmstate(const char *name) |
a672b469 | 2201 | { |
f0aa7a8b | 2202 | BlockDriverState *bs, *bs_vm_state; |
2d22b18f | 2203 | QEMUSnapshotInfo sn; |
a672b469 | 2204 | QEMUFile *f; |
751c6a17 | 2205 | int ret; |
79b3c12a | 2206 | AioContext *aio_context; |
a672b469 | 2207 | |
849f96e2 DL |
2208 | if (!bdrv_all_can_snapshot(&bs)) { |
2209 | error_report("Device '%s' is writable but does not support snapshots.", | |
2210 | bdrv_get_device_name(bs)); | |
2211 | return -ENOTSUP; | |
2212 | } | |
723ccda1 DL |
2213 | ret = bdrv_all_find_snapshot(name, &bs); |
2214 | if (ret < 0) { | |
2215 | error_report("Device '%s' does not have the requested snapshot '%s'", | |
2216 | bdrv_get_device_name(bs), name); | |
2217 | return ret; | |
2218 | } | |
849f96e2 | 2219 | |
7cb14481 | 2220 | bs_vm_state = bdrv_all_find_vmstate_bs(); |
f0aa7a8b MDCF |
2221 | if (!bs_vm_state) { |
2222 | error_report("No block device supports snapshots"); | |
2223 | return -ENOTSUP; | |
2224 | } | |
79b3c12a | 2225 | aio_context = bdrv_get_aio_context(bs_vm_state); |
f0aa7a8b MDCF |
2226 | |
2227 | /* Don't even try to load empty VM states */ | |
79b3c12a | 2228 | aio_context_acquire(aio_context); |
f0aa7a8b | 2229 | ret = bdrv_snapshot_find(bs_vm_state, &sn, name); |
79b3c12a | 2230 | aio_context_release(aio_context); |
f0aa7a8b MDCF |
2231 | if (ret < 0) { |
2232 | return ret; | |
2233 | } else if (sn.vm_state_size == 0) { | |
e11480db KW |
2234 | error_report("This is a disk-only snapshot. Revert to it offline " |
2235 | "using qemu-img."); | |
f0aa7a8b MDCF |
2236 | return -EINVAL; |
2237 | } | |
2238 | ||
a672b469 | 2239 | /* Flush all IO requests so they don't interfere with the new state. */ |
922453bc | 2240 | bdrv_drain_all(); |
a672b469 | 2241 | |
4c1cdbaa DL |
2242 | ret = bdrv_all_goto_snapshot(name, &bs); |
2243 | if (ret < 0) { | |
2244 | error_report("Error %d while activating snapshot '%s' on '%s'", | |
2245 | ret, name, bdrv_get_device_name(bs)); | |
2246 | return ret; | |
a672b469 AL |
2247 | } |
2248 | ||
a672b469 | 2249 | /* restore the VM state */ |
f0aa7a8b | 2250 | f = qemu_fopen_bdrv(bs_vm_state, 0); |
a672b469 | 2251 | if (!f) { |
1ecda02b | 2252 | error_report("Could not open VM state file"); |
05f2401e | 2253 | return -EINVAL; |
a672b469 | 2254 | } |
f0aa7a8b | 2255 | |
5a8a49d7 | 2256 | qemu_system_reset(VMRESET_SILENT); |
bca7856a | 2257 | migration_incoming_state_new(f); |
f0aa7a8b | 2258 | |
79b3c12a DL |
2259 | aio_context_acquire(aio_context); |
2260 | ret = qemu_loadvm_state(f); | |
a672b469 | 2261 | qemu_fclose(f); |
79b3c12a DL |
2262 | aio_context_release(aio_context); |
2263 | ||
bca7856a | 2264 | migration_incoming_state_destroy(); |
a672b469 | 2265 | if (ret < 0) { |
1ecda02b | 2266 | error_report("Error %d while loading VM state", ret); |
05f2401e | 2267 | return ret; |
a672b469 | 2268 | } |
f0aa7a8b | 2269 | |
05f2401e | 2270 | return 0; |
7b630349 JQ |
2271 | } |
2272 | ||
3e5a50d6 | 2273 | void hmp_delvm(Monitor *mon, const QDict *qdict) |
a672b469 | 2274 | { |
af957387 | 2275 | BlockDriverState *bs; |
ba2b2288 | 2276 | Error *err; |
d54908a5 | 2277 | const char *name = qdict_get_str(qdict, "name"); |
a672b469 | 2278 | |
9b00ea37 | 2279 | if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) { |
d410fe14 MA |
2280 | error_reportf_err(err, |
2281 | "Error while deleting snapshot on device '%s': ", | |
2282 | bdrv_get_device_name(bs)); | |
a672b469 AL |
2283 | } |
2284 | } | |
2285 | ||
1ce6be24 | 2286 | void hmp_info_snapshots(Monitor *mon, const QDict *qdict) |
a672b469 AL |
2287 | { |
2288 | BlockDriverState *bs, *bs1; | |
0c204cc8 | 2289 | BdrvNextIterator it1; |
723ccda1 | 2290 | QEMUSnapshotInfo *sn_tab, *sn; |
0c204cc8 | 2291 | bool no_snapshot = true; |
723ccda1 | 2292 | int nb_sns, i; |
f9209915 | 2293 | int total; |
0c204cc8 | 2294 | int *global_snapshots; |
79b3c12a | 2295 | AioContext *aio_context; |
a672b469 | 2296 | |
0c204cc8 LM |
2297 | typedef struct SnapshotEntry { |
2298 | QEMUSnapshotInfo sn; | |
2299 | QTAILQ_ENTRY(SnapshotEntry) next; | |
2300 | } SnapshotEntry; | |
2301 | ||
2302 | typedef struct ImageEntry { | |
2303 | const char *imagename; | |
2304 | QTAILQ_ENTRY(ImageEntry) next; | |
2305 | QTAILQ_HEAD(, SnapshotEntry) snapshots; | |
2306 | } ImageEntry; | |
2307 | ||
2308 | QTAILQ_HEAD(, ImageEntry) image_list = | |
2309 | QTAILQ_HEAD_INITIALIZER(image_list); | |
2310 | ||
2311 | ImageEntry *image_entry, *next_ie; | |
2312 | SnapshotEntry *snapshot_entry; | |
2313 | ||
7cb14481 | 2314 | bs = bdrv_all_find_vmstate_bs(); |
a672b469 | 2315 | if (!bs) { |
376253ec | 2316 | monitor_printf(mon, "No available block device supports snapshots\n"); |
a672b469 AL |
2317 | return; |
2318 | } | |
79b3c12a | 2319 | aio_context = bdrv_get_aio_context(bs); |
a672b469 | 2320 | |
79b3c12a | 2321 | aio_context_acquire(aio_context); |
a672b469 | 2322 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
79b3c12a DL |
2323 | aio_context_release(aio_context); |
2324 | ||
a672b469 | 2325 | if (nb_sns < 0) { |
376253ec | 2326 | monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns); |
a672b469 AL |
2327 | return; |
2328 | } | |
f9209915 | 2329 | |
0c204cc8 LM |
2330 | for (bs1 = bdrv_first(&it1); bs1; bs1 = bdrv_next(&it1)) { |
2331 | int bs1_nb_sns = 0; | |
2332 | ImageEntry *ie; | |
2333 | SnapshotEntry *se; | |
2334 | AioContext *ctx = bdrv_get_aio_context(bs1); | |
2335 | ||
2336 | aio_context_acquire(ctx); | |
2337 | if (bdrv_can_snapshot(bs1)) { | |
2338 | sn = NULL; | |
2339 | bs1_nb_sns = bdrv_snapshot_list(bs1, &sn); | |
2340 | if (bs1_nb_sns > 0) { | |
2341 | no_snapshot = false; | |
2342 | ie = g_new0(ImageEntry, 1); | |
2343 | ie->imagename = bdrv_get_device_name(bs1); | |
2344 | QTAILQ_INIT(&ie->snapshots); | |
2345 | QTAILQ_INSERT_TAIL(&image_list, ie, next); | |
2346 | for (i = 0; i < bs1_nb_sns; i++) { | |
2347 | se = g_new0(SnapshotEntry, 1); | |
2348 | se->sn = sn[i]; | |
2349 | QTAILQ_INSERT_TAIL(&ie->snapshots, se, next); | |
2350 | } | |
2351 | } | |
2352 | g_free(sn); | |
2353 | } | |
2354 | aio_context_release(ctx); | |
2355 | } | |
2356 | ||
2357 | if (no_snapshot) { | |
f9209915 MDCF |
2358 | monitor_printf(mon, "There is no snapshot available.\n"); |
2359 | return; | |
2360 | } | |
2361 | ||
0c204cc8 | 2362 | global_snapshots = g_new0(int, nb_sns); |
f9209915 MDCF |
2363 | total = 0; |
2364 | for (i = 0; i < nb_sns; i++) { | |
0c204cc8 | 2365 | SnapshotEntry *next_sn; |
3a1ee711 | 2366 | if (bdrv_all_find_snapshot(sn_tab[i].name, &bs1) == 0) { |
0c204cc8 | 2367 | global_snapshots[total] = i; |
f9209915 | 2368 | total++; |
0c204cc8 LM |
2369 | QTAILQ_FOREACH(image_entry, &image_list, next) { |
2370 | QTAILQ_FOREACH_SAFE(snapshot_entry, &image_entry->snapshots, | |
2371 | next, next_sn) { | |
2372 | if (!strcmp(sn_tab[i].name, snapshot_entry->sn.name)) { | |
2373 | QTAILQ_REMOVE(&image_entry->snapshots, snapshot_entry, | |
2374 | next); | |
2375 | g_free(snapshot_entry); | |
2376 | } | |
2377 | } | |
2378 | } | |
f9209915 | 2379 | } |
a672b469 | 2380 | } |
f9209915 | 2381 | |
0c204cc8 LM |
2382 | monitor_printf(mon, "List of snapshots present on all disks:\n"); |
2383 | ||
f9209915 | 2384 | if (total > 0) { |
5b917044 WX |
2385 | bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL); |
2386 | monitor_printf(mon, "\n"); | |
f9209915 | 2387 | for (i = 0; i < total; i++) { |
0c204cc8 | 2388 | sn = &sn_tab[global_snapshots[i]]; |
3a1ee711 LM |
2389 | /* The ID is not guaranteed to be the same on all images, so |
2390 | * overwrite it. | |
2391 | */ | |
2392 | pstrcpy(sn->id_str, sizeof(sn->id_str), "--"); | |
5b917044 WX |
2393 | bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn); |
2394 | monitor_printf(mon, "\n"); | |
f9209915 MDCF |
2395 | } |
2396 | } else { | |
0c204cc8 | 2397 | monitor_printf(mon, "None\n"); |
f9209915 MDCF |
2398 | } |
2399 | ||
0c204cc8 LM |
2400 | QTAILQ_FOREACH(image_entry, &image_list, next) { |
2401 | if (QTAILQ_EMPTY(&image_entry->snapshots)) { | |
2402 | continue; | |
2403 | } | |
2404 | monitor_printf(mon, | |
2405 | "\nList of partial (non-loadable) snapshots on '%s':\n", | |
2406 | image_entry->imagename); | |
2407 | bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL); | |
2408 | monitor_printf(mon, "\n"); | |
2409 | QTAILQ_FOREACH(snapshot_entry, &image_entry->snapshots, next) { | |
2410 | bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, | |
2411 | &snapshot_entry->sn); | |
2412 | monitor_printf(mon, "\n"); | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | QTAILQ_FOREACH_SAFE(image_entry, &image_list, next, next_ie) { | |
2417 | SnapshotEntry *next_sn; | |
2418 | QTAILQ_FOREACH_SAFE(snapshot_entry, &image_entry->snapshots, next, | |
2419 | next_sn) { | |
2420 | g_free(snapshot_entry); | |
2421 | } | |
2422 | g_free(image_entry); | |
2423 | } | |
7267c094 | 2424 | g_free(sn_tab); |
0c204cc8 | 2425 | g_free(global_snapshots); |
f9209915 | 2426 | |
a672b469 | 2427 | } |
c5705a77 AK |
2428 | |
2429 | void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) | |
2430 | { | |
fa53a0e5 | 2431 | qemu_ram_set_idstr(mr->ram_block, |
c5705a77 AK |
2432 | memory_region_name(mr), dev); |
2433 | } | |
2434 | ||
2435 | void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) | |
2436 | { | |
fa53a0e5 | 2437 | qemu_ram_unset_idstr(mr->ram_block); |
c5705a77 AK |
2438 | } |
2439 | ||
2440 | void vmstate_register_ram_global(MemoryRegion *mr) | |
2441 | { | |
2442 | vmstate_register_ram(mr, NULL); | |
2443 | } |