1 /* 2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO) 3 * (a.k.a. Fault Tolerance or Continuous Replication) 4 * 5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 6 * Copyright (c) 2016 FUJITSU LIMITED 7 * Copyright (c) 2016 Intel Corporation 8 * 9 * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or 12 * later. See the COPYING file in the top-level directory. 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu-common.h" 17 #include "qemu/error-report.h" 18 #include "trace.h" 19 #include "qapi/error.h" 20 #include "net/net.h" 21 #include "net/eth.h" 22 #include "qom/object_interfaces.h" 23 #include "qemu/iov.h" 24 #include "qom/object.h" 25 #include "net/queue.h" 26 #include "chardev/char-fe.h" 27 #include "qemu/sockets.h" 28 #include "colo.h" 29 #include "sysemu/iothread.h" 30 #include "net/colo-compare.h" 31 #include "migration/colo.h" 32 #include "migration/migration.h" 33 #include "util.h" 34 35 #include "block/aio-wait.h" 36 #include "qemu/coroutine.h" 37 38 #define TYPE_COLO_COMPARE "colo-compare" 39 #define COLO_COMPARE(obj) \ 40 OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE) 41 42 static QTAILQ_HEAD(, CompareState) net_compares = 43 QTAILQ_HEAD_INITIALIZER(net_compares); 44 45 static NotifierList colo_compare_notifiers = 46 NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers); 47 48 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 49 #define MAX_QUEUE_SIZE 1024 50 51 #define COLO_COMPARE_FREE_PRIMARY 0x01 52 #define COLO_COMPARE_FREE_SECONDARY 0x02 53 54 #define REGULAR_PACKET_CHECK_MS 3000 55 #define DEFAULT_TIME_OUT_MS 3000 56 57 static QemuMutex colo_compare_mutex; 58 static bool colo_compare_active; 59 static QemuMutex event_mtx; 60 static QemuCond event_complete_cond; 61 static int event_unhandled_count; 62 63 /* 64 * + CompareState ++ 65 * | | 66 * +---------------+ +---------------+ +---------------+ 67 * | conn list + - > conn + ------- > conn + -- > ...... 68 * +---------------+ +---------------+ +---------------+ 69 * | | | | | | 70 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 71 * |primary | |secondary |primary | |secondary 72 * |packet | |packet + |packet | |packet + 73 * +--------+ +--------+ +--------+ +--------+ 74 * | | | | 75 * +---v----+ +---v----+ +---v----+ +---v----+ 76 * |primary | |secondary |primary | |secondary 77 * |packet | |packet + |packet | |packet + 78 * +--------+ +--------+ +--------+ +--------+ 79 * | | | | 80 * +---v----+ +---v----+ +---v----+ +---v----+ 81 * |primary | |secondary |primary | |secondary 82 * |packet | |packet + |packet | |packet + 83 * +--------+ +--------+ +--------+ +--------+ 84 */ 85 86 typedef struct SendCo { 87 Coroutine *co; 88 struct CompareState *s; 89 CharBackend *chr; 90 GQueue send_list; 91 bool notify_remote_frame; 92 bool done; 93 int ret; 94 } SendCo; 95 96 typedef struct SendEntry { 97 uint32_t size; 98 uint32_t vnet_hdr_len; 99 uint8_t *buf; 100 } SendEntry; 101 102 typedef struct CompareState { 103 Object parent; 104 105 char *pri_indev; 106 char *sec_indev; 107 char *outdev; 108 char *notify_dev; 109 CharBackend chr_pri_in; 110 CharBackend chr_sec_in; 111 CharBackend chr_out; 112 CharBackend chr_notify_dev; 113 SocketReadState pri_rs; 114 SocketReadState sec_rs; 115 SocketReadState notify_rs; 116 SendCo out_sendco; 117 SendCo notify_sendco; 118 bool vnet_hdr; 119 uint32_t compare_timeout; 120 uint32_t expired_scan_cycle; 121 122 /* 123 * Record the connection that through the NIC 124 * Element type: Connection 125 */ 126 GQueue conn_list; 127 /* Record the connection without repetition */ 128 GHashTable *connection_track_table; 129 130 IOThread *iothread; 131 GMainContext *worker_context; 132 QEMUTimer *packet_check_timer; 133 134 QEMUBH *event_bh; 135 enum colo_event event; 136 137 QTAILQ_ENTRY(CompareState) next; 138 } CompareState; 139 140 typedef struct CompareClass { 141 ObjectClass parent_class; 142 } CompareClass; 143 144 enum { 145 PRIMARY_IN = 0, 146 SECONDARY_IN, 147 }; 148 149 static const char *colo_mode[] = { 150 [PRIMARY_IN] = "primary", 151 [SECONDARY_IN] = "secondary", 152 }; 153 154 static int compare_chr_send(CompareState *s, 155 uint8_t *buf, 156 uint32_t size, 157 uint32_t vnet_hdr_len, 158 bool notify_remote_frame, 159 bool zero_copy); 160 161 static bool packet_matches_str(const char *str, 162 const uint8_t *buf, 163 uint32_t packet_len) 164 { 165 if (packet_len != strlen(str)) { 166 return false; 167 } 168 169 return !memcmp(str, buf, strlen(str)); 170 } 171 172 static void notify_remote_frame(CompareState *s) 173 { 174 char msg[] = "DO_CHECKPOINT"; 175 int ret = 0; 176 177 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 178 if (ret < 0) { 179 error_report("Notify Xen COLO-frame failed"); 180 } 181 } 182 183 static void colo_compare_inconsistency_notify(CompareState *s) 184 { 185 if (s->notify_dev) { 186 notify_remote_frame(s); 187 } else { 188 notifier_list_notify(&colo_compare_notifiers, 189 migrate_get_current()); 190 } 191 } 192 193 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 194 { 195 struct tcp_hdr *atcp, *btcp; 196 197 atcp = (struct tcp_hdr *)(a->transport_header); 198 btcp = (struct tcp_hdr *)(b->transport_header); 199 return ntohl(atcp->th_seq) - ntohl(btcp->th_seq); 200 } 201 202 static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) 203 { 204 Packet *pkt = data; 205 struct tcp_hdr *tcphd; 206 207 tcphd = (struct tcp_hdr *)pkt->transport_header; 208 209 pkt->tcp_seq = ntohl(tcphd->th_seq); 210 pkt->tcp_ack = ntohl(tcphd->th_ack); 211 *max_ack = *max_ack > pkt->tcp_ack ? *max_ack : pkt->tcp_ack; 212 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 213 + (tcphd->th_off << 2) - pkt->vnet_hdr_len; 214 pkt->payload_size = pkt->size - pkt->header_size; 215 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 216 pkt->flags = tcphd->th_flags; 217 } 218 219 /* 220 * Return 1 on success, if return 0 means the 221 * packet will be dropped 222 */ 223 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 224 { 225 if (g_queue_get_length(queue) <= MAX_QUEUE_SIZE) { 226 if (pkt->ip->ip_p == IPPROTO_TCP) { 227 fill_pkt_tcp_info(pkt, max_ack); 228 g_queue_insert_sorted(queue, 229 pkt, 230 (GCompareDataFunc)seq_sorter, 231 NULL); 232 } else { 233 g_queue_push_tail(queue, pkt); 234 } 235 return 1; 236 } 237 return 0; 238 } 239 240 /* 241 * Return 0 on success, if return -1 means the pkt 242 * is unsupported(arp and ipv6) and will be sent later 243 */ 244 static int packet_enqueue(CompareState *s, int mode, Connection **con) 245 { 246 ConnectionKey key; 247 Packet *pkt = NULL; 248 Connection *conn; 249 int ret; 250 251 if (mode == PRIMARY_IN) { 252 pkt = packet_new(s->pri_rs.buf, 253 s->pri_rs.packet_len, 254 s->pri_rs.vnet_hdr_len); 255 } else { 256 pkt = packet_new(s->sec_rs.buf, 257 s->sec_rs.packet_len, 258 s->sec_rs.vnet_hdr_len); 259 } 260 261 if (parse_packet_early(pkt)) { 262 packet_destroy(pkt, NULL); 263 pkt = NULL; 264 return -1; 265 } 266 fill_connection_key(pkt, &key); 267 268 conn = connection_get(s->connection_track_table, 269 &key, 270 &s->conn_list); 271 272 if (!conn->processing) { 273 g_queue_push_tail(&s->conn_list, conn); 274 conn->processing = true; 275 } 276 277 if (mode == PRIMARY_IN) { 278 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 279 } else { 280 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 281 } 282 283 if (!ret) { 284 trace_colo_compare_drop_packet(colo_mode[mode], 285 "queue size too big, drop packet"); 286 packet_destroy(pkt, NULL); 287 pkt = NULL; 288 } 289 290 *con = conn; 291 292 return 0; 293 } 294 295 static inline bool after(uint32_t seq1, uint32_t seq2) 296 { 297 return (int32_t)(seq1 - seq2) > 0; 298 } 299 300 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 301 { 302 int ret; 303 ret = compare_chr_send(s, 304 pkt->data, 305 pkt->size, 306 pkt->vnet_hdr_len, 307 false, 308 true); 309 if (ret < 0) { 310 error_report("colo send primary packet failed"); 311 } 312 trace_colo_compare_main("packet same and release packet"); 313 packet_destroy_partial(pkt, NULL); 314 } 315 316 /* 317 * The IP packets sent by primary and secondary 318 * will be compared in here 319 * TODO support ip fragment, Out-Of-Order 320 * return: 0 means packet same 321 * > 0 || < 0 means packet different 322 */ 323 static int colo_compare_packet_payload(Packet *ppkt, 324 Packet *spkt, 325 uint16_t poffset, 326 uint16_t soffset, 327 uint16_t len) 328 329 { 330 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { 331 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 332 333 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 334 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 335 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 336 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 337 338 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 339 pri_ip_dst, spkt->size, 340 sec_ip_src, sec_ip_dst); 341 } 342 343 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 344 } 345 346 /* 347 * return true means that the payload is consist and 348 * need to make the next comparison, false means do 349 * the checkpoint 350 */ 351 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 352 int8_t *mark, uint32_t max_ack) 353 { 354 *mark = 0; 355 356 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 357 if (!colo_compare_packet_payload(ppkt, spkt, 358 ppkt->header_size, spkt->header_size, 359 ppkt->payload_size)) { 360 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 361 return true; 362 } 363 } 364 365 /* one part of secondary packet payload still need to be compared */ 366 if (!after(ppkt->seq_end, spkt->seq_end)) { 367 if (!colo_compare_packet_payload(ppkt, spkt, 368 ppkt->header_size + ppkt->offset, 369 spkt->header_size + spkt->offset, 370 ppkt->payload_size - ppkt->offset)) { 371 if (!after(ppkt->tcp_ack, max_ack)) { 372 *mark = COLO_COMPARE_FREE_PRIMARY; 373 spkt->offset += ppkt->payload_size - ppkt->offset; 374 return true; 375 } else { 376 /* secondary guest hasn't ack the data, don't send 377 * out this packet 378 */ 379 return false; 380 } 381 } 382 } else { 383 /* primary packet is longer than secondary packet, compare 384 * the same part and mark the primary packet offset 385 */ 386 if (!colo_compare_packet_payload(ppkt, spkt, 387 ppkt->header_size + ppkt->offset, 388 spkt->header_size + spkt->offset, 389 spkt->payload_size - spkt->offset)) { 390 *mark = COLO_COMPARE_FREE_SECONDARY; 391 ppkt->offset += spkt->payload_size - spkt->offset; 392 return true; 393 } 394 } 395 396 return false; 397 } 398 399 static void colo_compare_tcp(CompareState *s, Connection *conn) 400 { 401 Packet *ppkt = NULL, *spkt = NULL; 402 int8_t mark; 403 404 /* 405 * If ppkt and spkt have the same payload, but ppkt's ACK 406 * is greater than spkt's ACK, in this case we can not 407 * send the ppkt because it will cause the secondary guest 408 * to miss sending some data in the next. Therefore, we 409 * record the maximum ACK in the current queue at both 410 * primary side and secondary side. Only when the ack is 411 * less than the smaller of the two maximum ack, then we 412 * can ensure that the packet's payload is acknowledged by 413 * primary and secondary. 414 */ 415 uint32_t min_ack = conn->pack > conn->sack ? conn->sack : conn->pack; 416 417 pri: 418 if (g_queue_is_empty(&conn->primary_list)) { 419 return; 420 } 421 ppkt = g_queue_pop_head(&conn->primary_list); 422 sec: 423 if (g_queue_is_empty(&conn->secondary_list)) { 424 g_queue_push_head(&conn->primary_list, ppkt); 425 return; 426 } 427 spkt = g_queue_pop_head(&conn->secondary_list); 428 429 if (ppkt->tcp_seq == ppkt->seq_end) { 430 colo_release_primary_pkt(s, ppkt); 431 ppkt = NULL; 432 } 433 434 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 435 trace_colo_compare_main("pri: this packet has compared"); 436 colo_release_primary_pkt(s, ppkt); 437 ppkt = NULL; 438 } 439 440 if (spkt->tcp_seq == spkt->seq_end) { 441 packet_destroy(spkt, NULL); 442 if (!ppkt) { 443 goto pri; 444 } else { 445 goto sec; 446 } 447 } else { 448 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 449 trace_colo_compare_main("sec: this packet has compared"); 450 packet_destroy(spkt, NULL); 451 if (!ppkt) { 452 goto pri; 453 } else { 454 goto sec; 455 } 456 } 457 if (!ppkt) { 458 g_queue_push_head(&conn->secondary_list, spkt); 459 goto pri; 460 } 461 } 462 463 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 464 trace_colo_compare_tcp_info("pri", 465 ppkt->tcp_seq, ppkt->tcp_ack, 466 ppkt->header_size, ppkt->payload_size, 467 ppkt->offset, ppkt->flags); 468 469 trace_colo_compare_tcp_info("sec", 470 spkt->tcp_seq, spkt->tcp_ack, 471 spkt->header_size, spkt->payload_size, 472 spkt->offset, spkt->flags); 473 474 if (mark == COLO_COMPARE_FREE_PRIMARY) { 475 conn->compare_seq = ppkt->seq_end; 476 colo_release_primary_pkt(s, ppkt); 477 g_queue_push_head(&conn->secondary_list, spkt); 478 goto pri; 479 } 480 if (mark == COLO_COMPARE_FREE_SECONDARY) { 481 conn->compare_seq = spkt->seq_end; 482 packet_destroy(spkt, NULL); 483 goto sec; 484 } 485 if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 486 conn->compare_seq = ppkt->seq_end; 487 colo_release_primary_pkt(s, ppkt); 488 packet_destroy(spkt, NULL); 489 goto pri; 490 } 491 } else { 492 g_queue_push_head(&conn->primary_list, ppkt); 493 g_queue_push_head(&conn->secondary_list, spkt); 494 495 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { 496 qemu_hexdump((char *)ppkt->data, stderr, 497 "colo-compare ppkt", ppkt->size); 498 qemu_hexdump((char *)spkt->data, stderr, 499 "colo-compare spkt", spkt->size); 500 } 501 502 colo_compare_inconsistency_notify(s); 503 } 504 } 505 506 507 /* 508 * Called from the compare thread on the primary 509 * for compare udp packet 510 */ 511 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 512 { 513 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 514 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 515 516 trace_colo_compare_main("compare udp"); 517 518 /* 519 * Because of ppkt and spkt are both in the same connection, 520 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 521 * same with spkt. In addition, IP header's Identification is a random 522 * field, we can handle it in IP fragmentation function later. 523 * COLO just concern the response net packet payload from primary guest 524 * and secondary guest are same or not, So we ignored all IP header include 525 * other field like TOS,TTL,IP Checksum. we only need to compare 526 * the ip payload here. 527 */ 528 if (ppkt->size != spkt->size) { 529 trace_colo_compare_main("UDP: payload size of packets are different"); 530 return -1; 531 } 532 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 533 ppkt->size - offset)) { 534 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 535 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 536 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { 537 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 538 ppkt->size); 539 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 540 spkt->size); 541 } 542 return -1; 543 } else { 544 return 0; 545 } 546 } 547 548 /* 549 * Called from the compare thread on the primary 550 * for compare icmp packet 551 */ 552 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 553 { 554 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 555 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 556 557 trace_colo_compare_main("compare icmp"); 558 559 /* 560 * Because of ppkt and spkt are both in the same connection, 561 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 562 * same with spkt. In addition, IP header's Identification is a random 563 * field, we can handle it in IP fragmentation function later. 564 * COLO just concern the response net packet payload from primary guest 565 * and secondary guest are same or not, So we ignored all IP header include 566 * other field like TOS,TTL,IP Checksum. we only need to compare 567 * the ip payload here. 568 */ 569 if (ppkt->size != spkt->size) { 570 trace_colo_compare_main("ICMP: payload size of packets are different"); 571 return -1; 572 } 573 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 574 ppkt->size - offset)) { 575 trace_colo_compare_icmp_miscompare("primary pkt size", 576 ppkt->size); 577 trace_colo_compare_icmp_miscompare("Secondary pkt size", 578 spkt->size); 579 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { 580 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 581 ppkt->size); 582 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 583 spkt->size); 584 } 585 return -1; 586 } else { 587 return 0; 588 } 589 } 590 591 /* 592 * Called from the compare thread on the primary 593 * for compare other packet 594 */ 595 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 596 { 597 uint16_t offset = ppkt->vnet_hdr_len; 598 599 trace_colo_compare_main("compare other"); 600 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { 601 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 602 603 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 604 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 605 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 606 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 607 608 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 609 pri_ip_dst, spkt->size, 610 sec_ip_src, sec_ip_dst); 611 } 612 613 if (ppkt->size != spkt->size) { 614 trace_colo_compare_main("Other: payload size of packets are different"); 615 return -1; 616 } 617 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 618 ppkt->size - offset); 619 } 620 621 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 622 { 623 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 624 625 if ((now - pkt->creation_ms) > (*check_time)) { 626 trace_colo_old_packet_check_found(pkt->creation_ms); 627 return 0; 628 } else { 629 return 1; 630 } 631 } 632 633 void colo_compare_register_notifier(Notifier *notify) 634 { 635 notifier_list_add(&colo_compare_notifiers, notify); 636 } 637 638 void colo_compare_unregister_notifier(Notifier *notify) 639 { 640 notifier_remove(notify); 641 } 642 643 static int colo_old_packet_check_one_conn(Connection *conn, 644 CompareState *s) 645 { 646 GList *result = NULL; 647 648 result = g_queue_find_custom(&conn->primary_list, 649 &s->compare_timeout, 650 (GCompareFunc)colo_old_packet_check_one); 651 652 if (result) { 653 /* Do checkpoint will flush old packet */ 654 colo_compare_inconsistency_notify(s); 655 return 0; 656 } 657 658 return 1; 659 } 660 661 /* 662 * Look for old packets that the secondary hasn't matched, 663 * if we have some then we have to checkpoint to wake 664 * the secondary up. 665 */ 666 static void colo_old_packet_check(void *opaque) 667 { 668 CompareState *s = opaque; 669 670 /* 671 * If we find one old packet, stop finding job and notify 672 * COLO frame do checkpoint. 673 */ 674 g_queue_find_custom(&s->conn_list, s, 675 (GCompareFunc)colo_old_packet_check_one_conn); 676 } 677 678 static void colo_compare_packet(CompareState *s, Connection *conn, 679 int (*HandlePacket)(Packet *spkt, 680 Packet *ppkt)) 681 { 682 Packet *pkt = NULL; 683 GList *result = NULL; 684 685 while (!g_queue_is_empty(&conn->primary_list) && 686 !g_queue_is_empty(&conn->secondary_list)) { 687 pkt = g_queue_pop_head(&conn->primary_list); 688 result = g_queue_find_custom(&conn->secondary_list, 689 pkt, (GCompareFunc)HandlePacket); 690 691 if (result) { 692 colo_release_primary_pkt(s, pkt); 693 g_queue_remove(&conn->secondary_list, result->data); 694 } else { 695 /* 696 * If one packet arrive late, the secondary_list or 697 * primary_list will be empty, so we can't compare it 698 * until next comparison. If the packets in the list are 699 * timeout, it will trigger a checkpoint request. 700 */ 701 trace_colo_compare_main("packet different"); 702 g_queue_push_head(&conn->primary_list, pkt); 703 704 colo_compare_inconsistency_notify(s); 705 break; 706 } 707 } 708 } 709 710 /* 711 * Called from the compare thread on the primary 712 * for compare packet with secondary list of the 713 * specified connection when a new packet was 714 * queued to it. 715 */ 716 static void colo_compare_connection(void *opaque, void *user_data) 717 { 718 CompareState *s = user_data; 719 Connection *conn = opaque; 720 721 switch (conn->ip_proto) { 722 case IPPROTO_TCP: 723 colo_compare_tcp(s, conn); 724 break; 725 case IPPROTO_UDP: 726 colo_compare_packet(s, conn, colo_packet_compare_udp); 727 break; 728 case IPPROTO_ICMP: 729 colo_compare_packet(s, conn, colo_packet_compare_icmp); 730 break; 731 default: 732 colo_compare_packet(s, conn, colo_packet_compare_other); 733 break; 734 } 735 } 736 737 static void coroutine_fn _compare_chr_send(void *opaque) 738 { 739 SendCo *sendco = opaque; 740 CompareState *s = sendco->s; 741 int ret = 0; 742 743 while (!g_queue_is_empty(&sendco->send_list)) { 744 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 745 uint32_t len = htonl(entry->size); 746 747 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 748 749 if (ret != sizeof(len)) { 750 g_free(entry->buf); 751 g_slice_free(SendEntry, entry); 752 goto err; 753 } 754 755 if (!sendco->notify_remote_frame && s->vnet_hdr) { 756 /* 757 * We send vnet header len make other module(like filter-redirector) 758 * know how to parse net packet correctly. 759 */ 760 len = htonl(entry->vnet_hdr_len); 761 762 ret = qemu_chr_fe_write_all(sendco->chr, 763 (uint8_t *)&len, 764 sizeof(len)); 765 766 if (ret != sizeof(len)) { 767 g_free(entry->buf); 768 g_slice_free(SendEntry, entry); 769 goto err; 770 } 771 } 772 773 ret = qemu_chr_fe_write_all(sendco->chr, 774 (uint8_t *)entry->buf, 775 entry->size); 776 777 if (ret != entry->size) { 778 g_free(entry->buf); 779 g_slice_free(SendEntry, entry); 780 goto err; 781 } 782 783 g_free(entry->buf); 784 g_slice_free(SendEntry, entry); 785 } 786 787 sendco->ret = 0; 788 goto out; 789 790 err: 791 while (!g_queue_is_empty(&sendco->send_list)) { 792 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 793 g_free(entry->buf); 794 g_slice_free(SendEntry, entry); 795 } 796 sendco->ret = ret < 0 ? ret : -EIO; 797 out: 798 sendco->co = NULL; 799 sendco->done = true; 800 aio_wait_kick(); 801 } 802 803 static int compare_chr_send(CompareState *s, 804 uint8_t *buf, 805 uint32_t size, 806 uint32_t vnet_hdr_len, 807 bool notify_remote_frame, 808 bool zero_copy) 809 { 810 SendCo *sendco; 811 SendEntry *entry; 812 813 if (notify_remote_frame) { 814 sendco = &s->notify_sendco; 815 } else { 816 sendco = &s->out_sendco; 817 } 818 819 if (!size) { 820 return 0; 821 } 822 823 entry = g_slice_new(SendEntry); 824 entry->size = size; 825 entry->vnet_hdr_len = vnet_hdr_len; 826 if (zero_copy) { 827 entry->buf = buf; 828 } else { 829 entry->buf = g_malloc(size); 830 memcpy(entry->buf, buf, size); 831 } 832 g_queue_push_head(&sendco->send_list, entry); 833 834 if (sendco->done) { 835 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 836 sendco->done = false; 837 qemu_coroutine_enter(sendco->co); 838 if (sendco->done) { 839 /* report early errors */ 840 return sendco->ret; 841 } 842 } 843 844 /* assume success */ 845 return 0; 846 } 847 848 static int compare_chr_can_read(void *opaque) 849 { 850 return COMPARE_READ_LEN_MAX; 851 } 852 853 /* 854 * Called from the main thread on the primary for packets 855 * arriving over the socket from the primary. 856 */ 857 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 858 { 859 CompareState *s = COLO_COMPARE(opaque); 860 int ret; 861 862 ret = net_fill_rstate(&s->pri_rs, buf, size); 863 if (ret == -1) { 864 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 865 NULL, NULL, true); 866 error_report("colo-compare primary_in error"); 867 } 868 } 869 870 /* 871 * Called from the main thread on the primary for packets 872 * arriving over the socket from the secondary. 873 */ 874 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 875 { 876 CompareState *s = COLO_COMPARE(opaque); 877 int ret; 878 879 ret = net_fill_rstate(&s->sec_rs, buf, size); 880 if (ret == -1) { 881 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 882 NULL, NULL, true); 883 error_report("colo-compare secondary_in error"); 884 } 885 } 886 887 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 888 { 889 CompareState *s = COLO_COMPARE(opaque); 890 int ret; 891 892 ret = net_fill_rstate(&s->notify_rs, buf, size); 893 if (ret == -1) { 894 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 895 NULL, NULL, true); 896 error_report("colo-compare notify_dev error"); 897 } 898 } 899 900 /* 901 * Check old packet regularly so it can watch for any packets 902 * that the secondary hasn't produced equivalents of. 903 */ 904 static void check_old_packet_regular(void *opaque) 905 { 906 CompareState *s = opaque; 907 908 /* if have old packet we will notify checkpoint */ 909 colo_old_packet_check(s); 910 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 911 s->expired_scan_cycle); 912 } 913 914 /* Public API, Used for COLO frame to notify compare event */ 915 void colo_notify_compares_event(void *opaque, int event, Error **errp) 916 { 917 CompareState *s; 918 qemu_mutex_lock(&colo_compare_mutex); 919 920 if (!colo_compare_active) { 921 qemu_mutex_unlock(&colo_compare_mutex); 922 return; 923 } 924 925 qemu_mutex_lock(&event_mtx); 926 QTAILQ_FOREACH(s, &net_compares, next) { 927 s->event = event; 928 qemu_bh_schedule(s->event_bh); 929 event_unhandled_count++; 930 } 931 /* Wait all compare threads to finish handling this event */ 932 while (event_unhandled_count > 0) { 933 qemu_cond_wait(&event_complete_cond, &event_mtx); 934 } 935 936 qemu_mutex_unlock(&event_mtx); 937 qemu_mutex_unlock(&colo_compare_mutex); 938 } 939 940 static void colo_compare_timer_init(CompareState *s) 941 { 942 AioContext *ctx = iothread_get_aio_context(s->iothread); 943 944 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, 945 SCALE_MS, check_old_packet_regular, 946 s); 947 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 948 s->expired_scan_cycle); 949 } 950 951 static void colo_compare_timer_del(CompareState *s) 952 { 953 if (s->packet_check_timer) { 954 timer_del(s->packet_check_timer); 955 timer_free(s->packet_check_timer); 956 s->packet_check_timer = NULL; 957 } 958 } 959 960 static void colo_flush_packets(void *opaque, void *user_data); 961 962 static void colo_compare_handle_event(void *opaque) 963 { 964 CompareState *s = opaque; 965 966 switch (s->event) { 967 case COLO_EVENT_CHECKPOINT: 968 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 969 break; 970 case COLO_EVENT_FAILOVER: 971 break; 972 default: 973 break; 974 } 975 976 qemu_mutex_lock(&event_mtx); 977 assert(event_unhandled_count > 0); 978 event_unhandled_count--; 979 qemu_cond_broadcast(&event_complete_cond); 980 qemu_mutex_unlock(&event_mtx); 981 } 982 983 static void colo_compare_iothread(CompareState *s) 984 { 985 AioContext *ctx = iothread_get_aio_context(s->iothread); 986 object_ref(OBJECT(s->iothread)); 987 s->worker_context = iothread_get_g_main_context(s->iothread); 988 989 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 990 compare_pri_chr_in, NULL, NULL, 991 s, s->worker_context, true); 992 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 993 compare_sec_chr_in, NULL, NULL, 994 s, s->worker_context, true); 995 if (s->notify_dev) { 996 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 997 compare_notify_chr, NULL, NULL, 998 s, s->worker_context, true); 999 } 1000 1001 colo_compare_timer_init(s); 1002 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 1003 } 1004 1005 static char *compare_get_pri_indev(Object *obj, Error **errp) 1006 { 1007 CompareState *s = COLO_COMPARE(obj); 1008 1009 return g_strdup(s->pri_indev); 1010 } 1011 1012 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1013 { 1014 CompareState *s = COLO_COMPARE(obj); 1015 1016 g_free(s->pri_indev); 1017 s->pri_indev = g_strdup(value); 1018 } 1019 1020 static char *compare_get_sec_indev(Object *obj, Error **errp) 1021 { 1022 CompareState *s = COLO_COMPARE(obj); 1023 1024 return g_strdup(s->sec_indev); 1025 } 1026 1027 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1028 { 1029 CompareState *s = COLO_COMPARE(obj); 1030 1031 g_free(s->sec_indev); 1032 s->sec_indev = g_strdup(value); 1033 } 1034 1035 static char *compare_get_outdev(Object *obj, Error **errp) 1036 { 1037 CompareState *s = COLO_COMPARE(obj); 1038 1039 return g_strdup(s->outdev); 1040 } 1041 1042 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1043 { 1044 CompareState *s = COLO_COMPARE(obj); 1045 1046 g_free(s->outdev); 1047 s->outdev = g_strdup(value); 1048 } 1049 1050 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1051 { 1052 CompareState *s = COLO_COMPARE(obj); 1053 1054 return s->vnet_hdr; 1055 } 1056 1057 static void compare_set_vnet_hdr(Object *obj, 1058 bool value, 1059 Error **errp) 1060 { 1061 CompareState *s = COLO_COMPARE(obj); 1062 1063 s->vnet_hdr = value; 1064 } 1065 1066 static char *compare_get_notify_dev(Object *obj, Error **errp) 1067 { 1068 CompareState *s = COLO_COMPARE(obj); 1069 1070 return g_strdup(s->notify_dev); 1071 } 1072 1073 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1074 { 1075 CompareState *s = COLO_COMPARE(obj); 1076 1077 g_free(s->notify_dev); 1078 s->notify_dev = g_strdup(value); 1079 } 1080 1081 static void compare_get_timeout(Object *obj, Visitor *v, 1082 const char *name, void *opaque, 1083 Error **errp) 1084 { 1085 CompareState *s = COLO_COMPARE(obj); 1086 uint32_t value = s->compare_timeout; 1087 1088 visit_type_uint32(v, name, &value, errp); 1089 } 1090 1091 static void compare_set_timeout(Object *obj, Visitor *v, 1092 const char *name, void *opaque, 1093 Error **errp) 1094 { 1095 CompareState *s = COLO_COMPARE(obj); 1096 Error *local_err = NULL; 1097 uint32_t value; 1098 1099 visit_type_uint32(v, name, &value, &local_err); 1100 if (local_err) { 1101 goto out; 1102 } 1103 if (!value) { 1104 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1105 object_get_typename(obj), name); 1106 goto out; 1107 } 1108 s->compare_timeout = value; 1109 1110 out: 1111 error_propagate(errp, local_err); 1112 } 1113 1114 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1115 const char *name, void *opaque, 1116 Error **errp) 1117 { 1118 CompareState *s = COLO_COMPARE(obj); 1119 uint32_t value = s->expired_scan_cycle; 1120 1121 visit_type_uint32(v, name, &value, errp); 1122 } 1123 1124 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1125 const char *name, void *opaque, 1126 Error **errp) 1127 { 1128 CompareState *s = COLO_COMPARE(obj); 1129 Error *local_err = NULL; 1130 uint32_t value; 1131 1132 visit_type_uint32(v, name, &value, &local_err); 1133 if (local_err) { 1134 goto out; 1135 } 1136 if (!value) { 1137 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1138 object_get_typename(obj), name); 1139 goto out; 1140 } 1141 s->expired_scan_cycle = value; 1142 1143 out: 1144 error_propagate(errp, local_err); 1145 } 1146 1147 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1148 { 1149 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1150 Connection *conn = NULL; 1151 1152 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1153 trace_colo_compare_main("primary: unsupported packet in"); 1154 compare_chr_send(s, 1155 pri_rs->buf, 1156 pri_rs->packet_len, 1157 pri_rs->vnet_hdr_len, 1158 false, 1159 false); 1160 } else { 1161 /* compare packet in the specified connection */ 1162 colo_compare_connection(conn, s); 1163 } 1164 } 1165 1166 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1167 { 1168 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1169 Connection *conn = NULL; 1170 1171 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1172 trace_colo_compare_main("secondary: unsupported packet in"); 1173 } else { 1174 /* compare packet in the specified connection */ 1175 colo_compare_connection(conn, s); 1176 } 1177 } 1178 1179 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1180 { 1181 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1182 1183 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1184 int ret; 1185 1186 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1187 notify_rs->buf, 1188 notify_rs->packet_len)) { 1189 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1190 if (ret < 0) { 1191 error_report("Notify Xen COLO-frame INIT failed"); 1192 } 1193 } else if (packet_matches_str("COLO_CHECKPOINT", 1194 notify_rs->buf, 1195 notify_rs->packet_len)) { 1196 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1197 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1198 } else { 1199 error_report("COLO compare got unsupported instruction"); 1200 } 1201 } 1202 1203 /* 1204 * Return 0 is success. 1205 * Return 1 is failed. 1206 */ 1207 static int find_and_check_chardev(Chardev **chr, 1208 char *chr_name, 1209 Error **errp) 1210 { 1211 *chr = qemu_chr_find(chr_name); 1212 if (*chr == NULL) { 1213 error_setg(errp, "Device '%s' not found", 1214 chr_name); 1215 return 1; 1216 } 1217 1218 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1219 error_setg(errp, "chardev \"%s\" is not reconnectable", 1220 chr_name); 1221 return 1; 1222 } 1223 1224 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1225 error_setg(errp, "chardev \"%s\" cannot switch context", 1226 chr_name); 1227 return 1; 1228 } 1229 1230 return 0; 1231 } 1232 1233 /* 1234 * Called from the main thread on the primary 1235 * to setup colo-compare. 1236 */ 1237 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1238 { 1239 CompareState *s = COLO_COMPARE(uc); 1240 Chardev *chr; 1241 1242 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1243 error_setg(errp, "colo compare needs 'primary_in' ," 1244 "'secondary_in','outdev','iothread' property set"); 1245 return; 1246 } else if (!strcmp(s->pri_indev, s->outdev) || 1247 !strcmp(s->sec_indev, s->outdev) || 1248 !strcmp(s->pri_indev, s->sec_indev)) { 1249 error_setg(errp, "'indev' and 'outdev' could not be same " 1250 "for compare module"); 1251 return; 1252 } 1253 1254 if (!s->compare_timeout) { 1255 /* Set default value to 3000 MS */ 1256 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1257 } 1258 1259 if (!s->expired_scan_cycle) { 1260 /* Set default value to 3000 MS */ 1261 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1262 } 1263 1264 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1265 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1266 return; 1267 } 1268 1269 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1270 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1271 return; 1272 } 1273 1274 if (find_and_check_chardev(&chr, s->outdev, errp) || 1275 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1276 return; 1277 } 1278 1279 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1280 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1281 1282 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1283 if (s->notify_dev) { 1284 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1285 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1286 return; 1287 } 1288 1289 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1290 s->vnet_hdr); 1291 } 1292 1293 s->out_sendco.s = s; 1294 s->out_sendco.chr = &s->chr_out; 1295 s->out_sendco.notify_remote_frame = false; 1296 s->out_sendco.done = true; 1297 g_queue_init(&s->out_sendco.send_list); 1298 1299 if (s->notify_dev) { 1300 s->notify_sendco.s = s; 1301 s->notify_sendco.chr = &s->chr_notify_dev; 1302 s->notify_sendco.notify_remote_frame = true; 1303 s->notify_sendco.done = true; 1304 g_queue_init(&s->notify_sendco.send_list); 1305 } 1306 1307 g_queue_init(&s->conn_list); 1308 1309 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1310 connection_key_equal, 1311 g_free, 1312 connection_destroy); 1313 1314 colo_compare_iothread(s); 1315 1316 qemu_mutex_lock(&colo_compare_mutex); 1317 if (!colo_compare_active) { 1318 qemu_mutex_init(&event_mtx); 1319 qemu_cond_init(&event_complete_cond); 1320 colo_compare_active = true; 1321 } 1322 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1323 qemu_mutex_unlock(&colo_compare_mutex); 1324 1325 return; 1326 } 1327 1328 static void colo_flush_packets(void *opaque, void *user_data) 1329 { 1330 CompareState *s = user_data; 1331 Connection *conn = opaque; 1332 Packet *pkt = NULL; 1333 1334 while (!g_queue_is_empty(&conn->primary_list)) { 1335 pkt = g_queue_pop_head(&conn->primary_list); 1336 compare_chr_send(s, 1337 pkt->data, 1338 pkt->size, 1339 pkt->vnet_hdr_len, 1340 false, 1341 true); 1342 packet_destroy_partial(pkt, NULL); 1343 } 1344 while (!g_queue_is_empty(&conn->secondary_list)) { 1345 pkt = g_queue_pop_head(&conn->secondary_list); 1346 packet_destroy(pkt, NULL); 1347 } 1348 } 1349 1350 static void colo_compare_class_init(ObjectClass *oc, void *data) 1351 { 1352 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1353 1354 ucc->complete = colo_compare_complete; 1355 } 1356 1357 static void colo_compare_init(Object *obj) 1358 { 1359 CompareState *s = COLO_COMPARE(obj); 1360 1361 object_property_add_str(obj, "primary_in", 1362 compare_get_pri_indev, compare_set_pri_indev); 1363 object_property_add_str(obj, "secondary_in", 1364 compare_get_sec_indev, compare_set_sec_indev); 1365 object_property_add_str(obj, "outdev", 1366 compare_get_outdev, compare_set_outdev); 1367 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1368 (Object **)&s->iothread, 1369 object_property_allow_set_link, 1370 OBJ_PROP_LINK_STRONG); 1371 /* This parameter just for Xen COLO */ 1372 object_property_add_str(obj, "notify_dev", 1373 compare_get_notify_dev, compare_set_notify_dev); 1374 1375 object_property_add(obj, "compare_timeout", "uint32", 1376 compare_get_timeout, 1377 compare_set_timeout, NULL, NULL); 1378 1379 object_property_add(obj, "expired_scan_cycle", "uint32", 1380 compare_get_expired_scan_cycle, 1381 compare_set_expired_scan_cycle, NULL, NULL); 1382 1383 s->vnet_hdr = false; 1384 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1385 compare_set_vnet_hdr); 1386 } 1387 1388 static void colo_compare_finalize(Object *obj) 1389 { 1390 CompareState *s = COLO_COMPARE(obj); 1391 CompareState *tmp = NULL; 1392 1393 qemu_mutex_lock(&colo_compare_mutex); 1394 QTAILQ_FOREACH(tmp, &net_compares, next) { 1395 if (tmp == s) { 1396 QTAILQ_REMOVE(&net_compares, s, next); 1397 break; 1398 } 1399 } 1400 if (QTAILQ_EMPTY(&net_compares)) { 1401 colo_compare_active = false; 1402 qemu_mutex_destroy(&event_mtx); 1403 qemu_cond_destroy(&event_complete_cond); 1404 } 1405 qemu_mutex_unlock(&colo_compare_mutex); 1406 1407 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1408 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1409 qemu_chr_fe_deinit(&s->chr_out, false); 1410 if (s->notify_dev) { 1411 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1412 } 1413 1414 if (s->iothread) { 1415 colo_compare_timer_del(s); 1416 } 1417 1418 qemu_bh_delete(s->event_bh); 1419 1420 AioContext *ctx = iothread_get_aio_context(s->iothread); 1421 aio_context_acquire(ctx); 1422 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1423 if (s->notify_dev) { 1424 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1425 } 1426 aio_context_release(ctx); 1427 1428 /* Release all unhandled packets after compare thead exited */ 1429 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1430 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1431 1432 g_queue_clear(&s->conn_list); 1433 g_queue_clear(&s->out_sendco.send_list); 1434 if (s->notify_dev) { 1435 g_queue_clear(&s->notify_sendco.send_list); 1436 } 1437 1438 if (s->connection_track_table) { 1439 g_hash_table_destroy(s->connection_track_table); 1440 } 1441 1442 if (s->iothread) { 1443 object_unref(OBJECT(s->iothread)); 1444 } 1445 1446 g_free(s->pri_indev); 1447 g_free(s->sec_indev); 1448 g_free(s->outdev); 1449 g_free(s->notify_dev); 1450 } 1451 1452 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1453 { 1454 colo_compare_active = false; 1455 qemu_mutex_init(&colo_compare_mutex); 1456 } 1457 1458 static const TypeInfo colo_compare_info = { 1459 .name = TYPE_COLO_COMPARE, 1460 .parent = TYPE_OBJECT, 1461 .instance_size = sizeof(CompareState), 1462 .instance_init = colo_compare_init, 1463 .instance_finalize = colo_compare_finalize, 1464 .class_size = sizeof(CompareClass), 1465 .class_init = colo_compare_class_init, 1466 .interfaces = (InterfaceInfo[]) { 1467 { TYPE_USER_CREATABLE }, 1468 { } 1469 } 1470 }; 1471 1472 static void register_types(void) 1473 { 1474 type_register_static(&colo_compare_info); 1475 } 1476 1477 type_init(register_types); 1478