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/error-report.h" 17 #include "trace.h" 18 #include "qapi/error.h" 19 #include "net/net.h" 20 #include "net/eth.h" 21 #include "qom/object_interfaces.h" 22 #include "qemu/iov.h" 23 #include "qom/object.h" 24 #include "net/queue.h" 25 #include "chardev/char-fe.h" 26 #include "qemu/sockets.h" 27 #include "colo.h" 28 #include "sysemu/iothread.h" 29 #include "net/colo-compare.h" 30 #include "migration/colo.h" 31 #include "migration/migration.h" 32 #include "util.h" 33 34 #include "block/aio-wait.h" 35 #include "qemu/coroutine.h" 36 37 #define TYPE_COLO_COMPARE "colo-compare" 38 typedef struct CompareState CompareState; 39 DECLARE_INSTANCE_CHECKER(CompareState, COLO_COMPARE, 40 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 1000 55 #define DEFAULT_TIME_OUT_MS 3000 56 57 /* #define DEBUG_COLO_PACKETS */ 58 59 static QemuMutex colo_compare_mutex; 60 static bool colo_compare_active; 61 static QemuMutex event_mtx; 62 static QemuCond event_complete_cond; 63 static int event_unhandled_count; 64 static uint32_t max_queue_size; 65 66 /* 67 * + CompareState ++ 68 * | | 69 * +---------------+ +---------------+ +---------------+ 70 * | conn list + - > conn + ------- > conn + -- > ...... 71 * +---------------+ +---------------+ +---------------+ 72 * | | | | | | 73 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 74 * |primary | |secondary |primary | |secondary 75 * |packet | |packet + |packet | |packet + 76 * +--------+ +--------+ +--------+ +--------+ 77 * | | | | 78 * +---v----+ +---v----+ +---v----+ +---v----+ 79 * |primary | |secondary |primary | |secondary 80 * |packet | |packet + |packet | |packet + 81 * +--------+ +--------+ +--------+ +--------+ 82 * | | | | 83 * +---v----+ +---v----+ +---v----+ +---v----+ 84 * |primary | |secondary |primary | |secondary 85 * |packet | |packet + |packet | |packet + 86 * +--------+ +--------+ +--------+ +--------+ 87 */ 88 89 typedef struct SendCo { 90 Coroutine *co; 91 struct CompareState *s; 92 CharBackend *chr; 93 GQueue send_list; 94 bool notify_remote_frame; 95 bool done; 96 int ret; 97 } SendCo; 98 99 typedef struct SendEntry { 100 uint32_t size; 101 uint32_t vnet_hdr_len; 102 uint8_t *buf; 103 } SendEntry; 104 105 struct CompareState { 106 Object parent; 107 108 char *pri_indev; 109 char *sec_indev; 110 char *outdev; 111 char *notify_dev; 112 CharBackend chr_pri_in; 113 CharBackend chr_sec_in; 114 CharBackend chr_out; 115 CharBackend chr_notify_dev; 116 SocketReadState pri_rs; 117 SocketReadState sec_rs; 118 SocketReadState notify_rs; 119 SendCo out_sendco; 120 SendCo notify_sendco; 121 bool vnet_hdr; 122 uint64_t compare_timeout; 123 uint32_t expired_scan_cycle; 124 125 /* 126 * Record the connection that through the NIC 127 * Element type: Connection 128 */ 129 GQueue conn_list; 130 /* Record the connection without repetition */ 131 GHashTable *connection_track_table; 132 133 IOThread *iothread; 134 GMainContext *worker_context; 135 QEMUTimer *packet_check_timer; 136 137 QEMUBH *event_bh; 138 enum colo_event event; 139 140 QTAILQ_ENTRY(CompareState) next; 141 }; 142 143 typedef struct CompareClass { 144 ObjectClass parent_class; 145 } CompareClass; 146 147 enum { 148 PRIMARY_IN = 0, 149 SECONDARY_IN, 150 }; 151 152 static const char *colo_mode[] = { 153 [PRIMARY_IN] = "primary", 154 [SECONDARY_IN] = "secondary", 155 }; 156 157 static int compare_chr_send(CompareState *s, 158 uint8_t *buf, 159 uint32_t size, 160 uint32_t vnet_hdr_len, 161 bool notify_remote_frame, 162 bool zero_copy); 163 164 static bool packet_matches_str(const char *str, 165 const uint8_t *buf, 166 uint32_t packet_len) 167 { 168 if (packet_len != strlen(str)) { 169 return false; 170 } 171 172 return !memcmp(str, buf, packet_len); 173 } 174 175 static void notify_remote_frame(CompareState *s) 176 { 177 char msg[] = "DO_CHECKPOINT"; 178 int ret = 0; 179 180 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 181 if (ret < 0) { 182 error_report("Notify Xen COLO-frame failed"); 183 } 184 } 185 186 static void colo_compare_inconsistency_notify(CompareState *s) 187 { 188 if (s->notify_dev) { 189 notify_remote_frame(s); 190 } else { 191 notifier_list_notify(&colo_compare_notifiers, 192 migrate_get_current()); 193 } 194 } 195 196 /* Use restricted to colo_insert_packet() */ 197 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 198 { 199 return b->tcp_seq - a->tcp_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 /* Need to consider ACK will bigger than uint32_t MAX */ 212 *max_ack = pkt->tcp_ack - *max_ack > 0 ? pkt->tcp_ack : *max_ack; 213 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 214 + (tcphd->th_off << 2); 215 pkt->payload_size = pkt->size - pkt->header_size; 216 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 217 pkt->flags = tcphd->th_flags; 218 } 219 220 /* 221 * Return 1 on success, if return 0 means the 222 * packet will be dropped 223 */ 224 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 225 { 226 if (g_queue_get_length(queue) <= max_queue_size) { 227 if (pkt->ip->ip_p == IPPROTO_TCP) { 228 fill_pkt_tcp_info(pkt, max_ack); 229 g_queue_insert_sorted(queue, 230 pkt, 231 (GCompareDataFunc)seq_sorter, 232 NULL); 233 } else { 234 g_queue_push_tail(queue, pkt); 235 } 236 return 1; 237 } 238 return 0; 239 } 240 241 /* 242 * Return 0 on success, if return -1 means the pkt 243 * is unsupported(arp and ipv6) and will be sent later 244 */ 245 static int packet_enqueue(CompareState *s, int mode, Connection **con) 246 { 247 ConnectionKey key; 248 Packet *pkt = NULL; 249 Connection *conn; 250 int ret; 251 252 if (mode == PRIMARY_IN) { 253 pkt = packet_new(s->pri_rs.buf, 254 s->pri_rs.packet_len, 255 s->pri_rs.vnet_hdr_len); 256 } else { 257 pkt = packet_new(s->sec_rs.buf, 258 s->sec_rs.packet_len, 259 s->sec_rs.vnet_hdr_len); 260 } 261 262 if (parse_packet_early(pkt)) { 263 packet_destroy(pkt, NULL); 264 pkt = NULL; 265 return -1; 266 } 267 fill_connection_key(pkt, &key, false); 268 269 conn = connection_get(s->connection_track_table, 270 &key, 271 &s->conn_list); 272 273 if (!conn->processing) { 274 g_queue_push_tail(&s->conn_list, conn); 275 conn->processing = true; 276 } 277 278 if (mode == PRIMARY_IN) { 279 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 280 } else { 281 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 282 } 283 284 if (!ret) { 285 trace_colo_compare_drop_packet(colo_mode[mode], 286 "queue size too big, drop packet"); 287 packet_destroy(pkt, NULL); 288 pkt = NULL; 289 } 290 291 *con = conn; 292 293 return 0; 294 } 295 296 static inline bool after(uint32_t seq1, uint32_t seq2) 297 { 298 return (int32_t)(seq1 - seq2) > 0; 299 } 300 301 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 302 { 303 int ret; 304 ret = compare_chr_send(s, 305 pkt->data, 306 pkt->size, 307 pkt->vnet_hdr_len, 308 false, 309 true); 310 if (ret < 0) { 311 error_report("colo send primary packet failed"); 312 } 313 trace_colo_compare_main("packet same and release packet"); 314 packet_destroy_partial(pkt, NULL); 315 } 316 317 /* 318 * The IP packets sent by primary and secondary 319 * will be compared in here 320 * TODO support ip fragment, Out-Of-Order 321 * return: 0 means packet same 322 * > 0 || < 0 means packet different 323 */ 324 static int colo_compare_packet_payload(Packet *ppkt, 325 Packet *spkt, 326 uint16_t poffset, 327 uint16_t soffset, 328 uint16_t len) 329 330 { 331 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 332 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 333 334 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 335 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 336 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 337 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 338 339 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 340 pri_ip_dst, spkt->size, 341 sec_ip_src, sec_ip_dst); 342 } 343 344 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 345 } 346 347 /* 348 * return true means that the payload is consist and 349 * need to make the next comparison, false means do 350 * the checkpoint 351 */ 352 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 353 int8_t *mark, uint32_t max_ack) 354 { 355 *mark = 0; 356 357 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 358 if (!colo_compare_packet_payload(ppkt, spkt, 359 ppkt->header_size, spkt->header_size, 360 ppkt->payload_size)) { 361 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 362 return true; 363 } 364 } 365 366 /* one part of secondary packet payload still need to be compared */ 367 if (!after(ppkt->seq_end, spkt->seq_end)) { 368 if (!colo_compare_packet_payload(ppkt, spkt, 369 ppkt->header_size + ppkt->offset, 370 spkt->header_size + spkt->offset, 371 ppkt->payload_size - ppkt->offset)) { 372 if (!after(ppkt->tcp_ack, max_ack)) { 373 *mark = COLO_COMPARE_FREE_PRIMARY; 374 spkt->offset += ppkt->payload_size - ppkt->offset; 375 return true; 376 } else { 377 /* secondary guest hasn't ack the data, don't send 378 * out this packet 379 */ 380 return false; 381 } 382 } 383 } else { 384 /* primary packet is longer than secondary packet, compare 385 * the same part and mark the primary packet offset 386 */ 387 if (!colo_compare_packet_payload(ppkt, spkt, 388 ppkt->header_size + ppkt->offset, 389 spkt->header_size + spkt->offset, 390 spkt->payload_size - spkt->offset)) { 391 *mark = COLO_COMPARE_FREE_SECONDARY; 392 ppkt->offset += spkt->payload_size - spkt->offset; 393 return true; 394 } 395 } 396 397 return false; 398 } 399 400 static void colo_compare_tcp(CompareState *s, Connection *conn) 401 { 402 Packet *ppkt = NULL, *spkt = NULL; 403 int8_t mark; 404 405 /* 406 * If ppkt and spkt have the same payload, but ppkt's ACK 407 * is greater than spkt's ACK, in this case we can not 408 * send the ppkt because it will cause the secondary guest 409 * to miss sending some data in the next. Therefore, we 410 * record the maximum ACK in the current queue at both 411 * primary side and secondary side. Only when the ack is 412 * less than the smaller of the two maximum ack, then we 413 * can ensure that the packet's payload is acknowledged by 414 * primary and secondary. 415 */ 416 uint32_t min_ack = conn->pack - conn->sack > 0 ? 417 conn->sack : conn->pack; 418 419 pri: 420 if (g_queue_is_empty(&conn->primary_list)) { 421 return; 422 } 423 ppkt = g_queue_pop_tail(&conn->primary_list); 424 sec: 425 if (g_queue_is_empty(&conn->secondary_list)) { 426 g_queue_push_tail(&conn->primary_list, ppkt); 427 return; 428 } 429 spkt = g_queue_pop_tail(&conn->secondary_list); 430 431 if (ppkt->tcp_seq == ppkt->seq_end) { 432 colo_release_primary_pkt(s, ppkt); 433 ppkt = NULL; 434 } 435 436 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 437 trace_colo_compare_main("pri: this packet has compared"); 438 colo_release_primary_pkt(s, ppkt); 439 ppkt = NULL; 440 } 441 442 if (spkt->tcp_seq == spkt->seq_end) { 443 packet_destroy(spkt, NULL); 444 if (!ppkt) { 445 goto pri; 446 } else { 447 goto sec; 448 } 449 } else { 450 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 451 trace_colo_compare_main("sec: this packet has compared"); 452 packet_destroy(spkt, NULL); 453 if (!ppkt) { 454 goto pri; 455 } else { 456 goto sec; 457 } 458 } 459 if (!ppkt) { 460 g_queue_push_tail(&conn->secondary_list, spkt); 461 goto pri; 462 } 463 } 464 465 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 466 trace_colo_compare_tcp_info("pri", 467 ppkt->tcp_seq, ppkt->tcp_ack, 468 ppkt->header_size, ppkt->payload_size, 469 ppkt->offset, ppkt->flags); 470 471 trace_colo_compare_tcp_info("sec", 472 spkt->tcp_seq, spkt->tcp_ack, 473 spkt->header_size, spkt->payload_size, 474 spkt->offset, spkt->flags); 475 476 if (mark == COLO_COMPARE_FREE_PRIMARY) { 477 conn->compare_seq = ppkt->seq_end; 478 colo_release_primary_pkt(s, ppkt); 479 g_queue_push_tail(&conn->secondary_list, spkt); 480 goto pri; 481 } else if (mark == COLO_COMPARE_FREE_SECONDARY) { 482 conn->compare_seq = spkt->seq_end; 483 packet_destroy(spkt, NULL); 484 goto sec; 485 } else 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_tail(&conn->primary_list, ppkt); 493 g_queue_push_tail(&conn->secondary_list, spkt); 494 495 #ifdef DEBUG_COLO_PACKETS 496 qemu_hexdump(stderr, "colo-compare ppkt", ppkt->data, ppkt->size); 497 qemu_hexdump(stderr, "colo-compare spkt", spkt->data, spkt->size); 498 #endif 499 500 colo_compare_inconsistency_notify(s); 501 } 502 } 503 504 505 /* 506 * Called from the compare thread on the primary 507 * for compare udp packet 508 */ 509 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 510 { 511 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 512 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 513 514 trace_colo_compare_main("compare udp"); 515 516 /* 517 * Because of ppkt and spkt are both in the same connection, 518 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 519 * same with spkt. In addition, IP header's Identification is a random 520 * field, we can handle it in IP fragmentation function later. 521 * COLO just concern the response net packet payload from primary guest 522 * and secondary guest are same or not, So we ignored all IP header include 523 * other field like TOS,TTL,IP Checksum. we only need to compare 524 * the ip payload here. 525 */ 526 if (ppkt->size != spkt->size) { 527 trace_colo_compare_main("UDP: payload size of packets are different"); 528 return -1; 529 } 530 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 531 ppkt->size - offset)) { 532 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 533 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 534 #ifdef DEBUG_COLO_PACKETS 535 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 536 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 537 #endif 538 return -1; 539 } else { 540 return 0; 541 } 542 } 543 544 /* 545 * Called from the compare thread on the primary 546 * for compare icmp packet 547 */ 548 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 549 { 550 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 551 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 552 553 trace_colo_compare_main("compare icmp"); 554 555 /* 556 * Because of ppkt and spkt are both in the same connection, 557 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 558 * same with spkt. In addition, IP header's Identification is a random 559 * field, we can handle it in IP fragmentation function later. 560 * COLO just concern the response net packet payload from primary guest 561 * and secondary guest are same or not, So we ignored all IP header include 562 * other field like TOS,TTL,IP Checksum. we only need to compare 563 * the ip payload here. 564 */ 565 if (ppkt->size != spkt->size) { 566 trace_colo_compare_main("ICMP: payload size of packets are different"); 567 return -1; 568 } 569 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 570 ppkt->size - offset)) { 571 trace_colo_compare_icmp_miscompare("primary pkt size", 572 ppkt->size); 573 trace_colo_compare_icmp_miscompare("Secondary pkt size", 574 spkt->size); 575 #ifdef DEBUG_COLO_PACKETS 576 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 577 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 578 #endif 579 return -1; 580 } else { 581 return 0; 582 } 583 } 584 585 /* 586 * Called from the compare thread on the primary 587 * for compare other packet 588 */ 589 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 590 { 591 uint16_t offset = ppkt->vnet_hdr_len; 592 593 trace_colo_compare_main("compare other"); 594 if (ppkt->size != spkt->size) { 595 trace_colo_compare_main("Other: payload size of packets are different"); 596 return -1; 597 } 598 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 599 ppkt->size - offset); 600 } 601 602 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 603 { 604 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 605 606 if ((now - pkt->creation_ms) > (*check_time)) { 607 trace_colo_old_packet_check_found(pkt->creation_ms); 608 return 0; 609 } else { 610 return 1; 611 } 612 } 613 614 void colo_compare_register_notifier(Notifier *notify) 615 { 616 notifier_list_add(&colo_compare_notifiers, notify); 617 } 618 619 void colo_compare_unregister_notifier(Notifier *notify) 620 { 621 notifier_remove(notify); 622 } 623 624 static int colo_old_packet_check_one_conn(Connection *conn, 625 CompareState *s) 626 { 627 if (!g_queue_is_empty(&conn->primary_list)) { 628 if (g_queue_find_custom(&conn->primary_list, 629 &s->compare_timeout, 630 (GCompareFunc)colo_old_packet_check_one)) 631 goto out; 632 } 633 634 if (!g_queue_is_empty(&conn->secondary_list)) { 635 if (g_queue_find_custom(&conn->secondary_list, 636 &s->compare_timeout, 637 (GCompareFunc)colo_old_packet_check_one)) 638 goto out; 639 } 640 641 return 1; 642 643 out: 644 /* Do checkpoint will flush old packet */ 645 colo_compare_inconsistency_notify(s); 646 return 0; 647 } 648 649 /* 650 * Look for old packets that the secondary hasn't matched, 651 * if we have some then we have to checkpoint to wake 652 * the secondary up. 653 */ 654 static void colo_old_packet_check(void *opaque) 655 { 656 CompareState *s = opaque; 657 658 /* 659 * If we find one old packet, stop finding job and notify 660 * COLO frame do checkpoint. 661 */ 662 g_queue_find_custom(&s->conn_list, s, 663 (GCompareFunc)colo_old_packet_check_one_conn); 664 } 665 666 static void colo_compare_packet(CompareState *s, Connection *conn, 667 int (*HandlePacket)(Packet *spkt, 668 Packet *ppkt)) 669 { 670 Packet *pkt = NULL; 671 GList *result = NULL; 672 673 while (!g_queue_is_empty(&conn->primary_list) && 674 !g_queue_is_empty(&conn->secondary_list)) { 675 pkt = g_queue_pop_tail(&conn->primary_list); 676 result = g_queue_find_custom(&conn->secondary_list, 677 pkt, (GCompareFunc)HandlePacket); 678 679 if (result) { 680 colo_release_primary_pkt(s, pkt); 681 packet_destroy(result->data, NULL); 682 g_queue_delete_link(&conn->secondary_list, result); 683 } else { 684 /* 685 * If one packet arrive late, the secondary_list or 686 * primary_list will be empty, so we can't compare it 687 * until next comparison. If the packets in the list are 688 * timeout, it will trigger a checkpoint request. 689 */ 690 trace_colo_compare_main("packet different"); 691 g_queue_push_tail(&conn->primary_list, pkt); 692 693 colo_compare_inconsistency_notify(s); 694 break; 695 } 696 } 697 } 698 699 /* 700 * Called from the compare thread on the primary 701 * for compare packet with secondary list of the 702 * specified connection when a new packet was 703 * queued to it. 704 */ 705 static void colo_compare_connection(void *opaque, void *user_data) 706 { 707 CompareState *s = user_data; 708 Connection *conn = opaque; 709 710 switch (conn->ip_proto) { 711 case IPPROTO_TCP: 712 colo_compare_tcp(s, conn); 713 break; 714 case IPPROTO_UDP: 715 colo_compare_packet(s, conn, colo_packet_compare_udp); 716 break; 717 case IPPROTO_ICMP: 718 colo_compare_packet(s, conn, colo_packet_compare_icmp); 719 break; 720 default: 721 colo_compare_packet(s, conn, colo_packet_compare_other); 722 break; 723 } 724 } 725 726 static void coroutine_fn _compare_chr_send(void *opaque) 727 { 728 SendCo *sendco = opaque; 729 CompareState *s = sendco->s; 730 int ret = 0; 731 732 while (!g_queue_is_empty(&sendco->send_list)) { 733 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 734 uint32_t len = htonl(entry->size); 735 736 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 737 738 if (ret != sizeof(len)) { 739 g_free(entry->buf); 740 g_slice_free(SendEntry, entry); 741 goto err; 742 } 743 744 if (!sendco->notify_remote_frame && s->vnet_hdr) { 745 /* 746 * We send vnet header len make other module(like filter-redirector) 747 * know how to parse net packet correctly. 748 */ 749 len = htonl(entry->vnet_hdr_len); 750 751 ret = qemu_chr_fe_write_all(sendco->chr, 752 (uint8_t *)&len, 753 sizeof(len)); 754 755 if (ret != sizeof(len)) { 756 g_free(entry->buf); 757 g_slice_free(SendEntry, entry); 758 goto err; 759 } 760 } 761 762 ret = qemu_chr_fe_write_all(sendco->chr, 763 (uint8_t *)entry->buf, 764 entry->size); 765 766 if (ret != entry->size) { 767 g_free(entry->buf); 768 g_slice_free(SendEntry, entry); 769 goto err; 770 } 771 772 g_free(entry->buf); 773 g_slice_free(SendEntry, entry); 774 } 775 776 sendco->ret = 0; 777 goto out; 778 779 err: 780 while (!g_queue_is_empty(&sendco->send_list)) { 781 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 782 g_free(entry->buf); 783 g_slice_free(SendEntry, entry); 784 } 785 sendco->ret = ret < 0 ? ret : -EIO; 786 out: 787 sendco->co = NULL; 788 sendco->done = true; 789 aio_wait_kick(); 790 } 791 792 static int compare_chr_send(CompareState *s, 793 uint8_t *buf, 794 uint32_t size, 795 uint32_t vnet_hdr_len, 796 bool notify_remote_frame, 797 bool zero_copy) 798 { 799 SendCo *sendco; 800 SendEntry *entry; 801 802 if (notify_remote_frame) { 803 sendco = &s->notify_sendco; 804 } else { 805 sendco = &s->out_sendco; 806 } 807 808 if (!size) { 809 return -1; 810 } 811 812 entry = g_slice_new(SendEntry); 813 entry->size = size; 814 entry->vnet_hdr_len = vnet_hdr_len; 815 if (zero_copy) { 816 entry->buf = buf; 817 } else { 818 entry->buf = g_malloc(size); 819 memcpy(entry->buf, buf, size); 820 } 821 g_queue_push_tail(&sendco->send_list, entry); 822 823 if (sendco->done) { 824 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 825 sendco->done = false; 826 qemu_coroutine_enter(sendco->co); 827 if (sendco->done) { 828 /* report early errors */ 829 return sendco->ret; 830 } 831 } 832 833 /* assume success */ 834 return 0; 835 } 836 837 static int compare_chr_can_read(void *opaque) 838 { 839 return COMPARE_READ_LEN_MAX; 840 } 841 842 /* 843 * Called from the main thread on the primary for packets 844 * arriving over the socket from the primary. 845 */ 846 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 847 { 848 CompareState *s = COLO_COMPARE(opaque); 849 int ret; 850 851 ret = net_fill_rstate(&s->pri_rs, buf, size); 852 if (ret == -1) { 853 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 854 NULL, NULL, true); 855 error_report("colo-compare primary_in error"); 856 } 857 } 858 859 /* 860 * Called from the main thread on the primary for packets 861 * arriving over the socket from the secondary. 862 */ 863 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 864 { 865 CompareState *s = COLO_COMPARE(opaque); 866 int ret; 867 868 ret = net_fill_rstate(&s->sec_rs, buf, size); 869 if (ret == -1) { 870 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 871 NULL, NULL, true); 872 error_report("colo-compare secondary_in error"); 873 } 874 } 875 876 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 877 { 878 CompareState *s = COLO_COMPARE(opaque); 879 int ret; 880 881 ret = net_fill_rstate(&s->notify_rs, buf, size); 882 if (ret == -1) { 883 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 884 NULL, NULL, true); 885 error_report("colo-compare notify_dev error"); 886 } 887 } 888 889 /* 890 * Check old packet regularly so it can watch for any packets 891 * that the secondary hasn't produced equivalents of. 892 */ 893 static void check_old_packet_regular(void *opaque) 894 { 895 CompareState *s = opaque; 896 897 /* if have old packet we will notify checkpoint */ 898 colo_old_packet_check(s); 899 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 900 s->expired_scan_cycle); 901 } 902 903 /* Public API, Used for COLO frame to notify compare event */ 904 void colo_notify_compares_event(void *opaque, int event, Error **errp) 905 { 906 CompareState *s; 907 qemu_mutex_lock(&colo_compare_mutex); 908 909 if (!colo_compare_active) { 910 qemu_mutex_unlock(&colo_compare_mutex); 911 return; 912 } 913 914 qemu_mutex_lock(&event_mtx); 915 QTAILQ_FOREACH(s, &net_compares, next) { 916 s->event = event; 917 qemu_bh_schedule(s->event_bh); 918 event_unhandled_count++; 919 } 920 /* Wait all compare threads to finish handling this event */ 921 while (event_unhandled_count > 0) { 922 qemu_cond_wait(&event_complete_cond, &event_mtx); 923 } 924 925 qemu_mutex_unlock(&event_mtx); 926 qemu_mutex_unlock(&colo_compare_mutex); 927 } 928 929 static void colo_compare_timer_init(CompareState *s) 930 { 931 AioContext *ctx = iothread_get_aio_context(s->iothread); 932 933 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_HOST, 934 SCALE_MS, check_old_packet_regular, 935 s); 936 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 937 s->expired_scan_cycle); 938 } 939 940 static void colo_compare_timer_del(CompareState *s) 941 { 942 if (s->packet_check_timer) { 943 timer_free(s->packet_check_timer); 944 s->packet_check_timer = NULL; 945 } 946 } 947 948 static void colo_flush_packets(void *opaque, void *user_data); 949 950 static void colo_compare_handle_event(void *opaque) 951 { 952 CompareState *s = opaque; 953 954 switch (s->event) { 955 case COLO_EVENT_CHECKPOINT: 956 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 957 break; 958 case COLO_EVENT_FAILOVER: 959 break; 960 default: 961 break; 962 } 963 964 qemu_mutex_lock(&event_mtx); 965 assert(event_unhandled_count > 0); 966 event_unhandled_count--; 967 qemu_cond_broadcast(&event_complete_cond); 968 qemu_mutex_unlock(&event_mtx); 969 } 970 971 static void colo_compare_iothread(CompareState *s) 972 { 973 AioContext *ctx = iothread_get_aio_context(s->iothread); 974 object_ref(OBJECT(s->iothread)); 975 s->worker_context = iothread_get_g_main_context(s->iothread); 976 977 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 978 compare_pri_chr_in, NULL, NULL, 979 s, s->worker_context, true); 980 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 981 compare_sec_chr_in, NULL, NULL, 982 s, s->worker_context, true); 983 if (s->notify_dev) { 984 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 985 compare_notify_chr, NULL, NULL, 986 s, s->worker_context, true); 987 } 988 989 colo_compare_timer_init(s); 990 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 991 } 992 993 static char *compare_get_pri_indev(Object *obj, Error **errp) 994 { 995 CompareState *s = COLO_COMPARE(obj); 996 997 return g_strdup(s->pri_indev); 998 } 999 1000 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1001 { 1002 CompareState *s = COLO_COMPARE(obj); 1003 1004 g_free(s->pri_indev); 1005 s->pri_indev = g_strdup(value); 1006 } 1007 1008 static char *compare_get_sec_indev(Object *obj, Error **errp) 1009 { 1010 CompareState *s = COLO_COMPARE(obj); 1011 1012 return g_strdup(s->sec_indev); 1013 } 1014 1015 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1016 { 1017 CompareState *s = COLO_COMPARE(obj); 1018 1019 g_free(s->sec_indev); 1020 s->sec_indev = g_strdup(value); 1021 } 1022 1023 static char *compare_get_outdev(Object *obj, Error **errp) 1024 { 1025 CompareState *s = COLO_COMPARE(obj); 1026 1027 return g_strdup(s->outdev); 1028 } 1029 1030 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1031 { 1032 CompareState *s = COLO_COMPARE(obj); 1033 1034 g_free(s->outdev); 1035 s->outdev = g_strdup(value); 1036 } 1037 1038 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1039 { 1040 CompareState *s = COLO_COMPARE(obj); 1041 1042 return s->vnet_hdr; 1043 } 1044 1045 static void compare_set_vnet_hdr(Object *obj, 1046 bool value, 1047 Error **errp) 1048 { 1049 CompareState *s = COLO_COMPARE(obj); 1050 1051 s->vnet_hdr = value; 1052 } 1053 1054 static char *compare_get_notify_dev(Object *obj, Error **errp) 1055 { 1056 CompareState *s = COLO_COMPARE(obj); 1057 1058 return g_strdup(s->notify_dev); 1059 } 1060 1061 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1062 { 1063 CompareState *s = COLO_COMPARE(obj); 1064 1065 g_free(s->notify_dev); 1066 s->notify_dev = g_strdup(value); 1067 } 1068 1069 static void compare_get_timeout(Object *obj, Visitor *v, 1070 const char *name, void *opaque, 1071 Error **errp) 1072 { 1073 CompareState *s = COLO_COMPARE(obj); 1074 uint64_t value = s->compare_timeout; 1075 1076 visit_type_uint64(v, name, &value, errp); 1077 } 1078 1079 static void compare_set_timeout(Object *obj, Visitor *v, 1080 const char *name, void *opaque, 1081 Error **errp) 1082 { 1083 CompareState *s = COLO_COMPARE(obj); 1084 uint32_t value; 1085 1086 if (!visit_type_uint32(v, name, &value, errp)) { 1087 return; 1088 } 1089 if (!value) { 1090 error_setg(errp, "Property '%s.%s' requires a positive value", 1091 object_get_typename(obj), name); 1092 return; 1093 } 1094 s->compare_timeout = value; 1095 } 1096 1097 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1098 const char *name, void *opaque, 1099 Error **errp) 1100 { 1101 CompareState *s = COLO_COMPARE(obj); 1102 uint32_t value = s->expired_scan_cycle; 1103 1104 visit_type_uint32(v, name, &value, errp); 1105 } 1106 1107 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1108 const char *name, void *opaque, 1109 Error **errp) 1110 { 1111 CompareState *s = COLO_COMPARE(obj); 1112 uint32_t value; 1113 1114 if (!visit_type_uint32(v, name, &value, errp)) { 1115 return; 1116 } 1117 if (!value) { 1118 error_setg(errp, "Property '%s.%s' requires a positive value", 1119 object_get_typename(obj), name); 1120 return; 1121 } 1122 s->expired_scan_cycle = value; 1123 } 1124 1125 static void get_max_queue_size(Object *obj, Visitor *v, 1126 const char *name, void *opaque, 1127 Error **errp) 1128 { 1129 uint32_t value = max_queue_size; 1130 1131 visit_type_uint32(v, name, &value, errp); 1132 } 1133 1134 static void set_max_queue_size(Object *obj, Visitor *v, 1135 const char *name, void *opaque, 1136 Error **errp) 1137 { 1138 Error *local_err = NULL; 1139 uint64_t value; 1140 1141 visit_type_uint64(v, name, &value, &local_err); 1142 if (local_err) { 1143 goto out; 1144 } 1145 if (!value) { 1146 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1147 object_get_typename(obj), name); 1148 goto out; 1149 } 1150 max_queue_size = value; 1151 1152 out: 1153 error_propagate(errp, local_err); 1154 } 1155 1156 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1157 { 1158 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1159 Connection *conn = NULL; 1160 1161 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1162 trace_colo_compare_main("primary: unsupported packet in"); 1163 compare_chr_send(s, 1164 pri_rs->buf, 1165 pri_rs->packet_len, 1166 pri_rs->vnet_hdr_len, 1167 false, 1168 false); 1169 } else { 1170 /* compare packet in the specified connection */ 1171 colo_compare_connection(conn, s); 1172 } 1173 } 1174 1175 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1176 { 1177 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1178 Connection *conn = NULL; 1179 1180 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1181 trace_colo_compare_main("secondary: unsupported packet in"); 1182 } else { 1183 /* compare packet in the specified connection */ 1184 colo_compare_connection(conn, s); 1185 } 1186 } 1187 1188 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1189 { 1190 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1191 1192 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1193 int ret; 1194 1195 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1196 notify_rs->buf, 1197 notify_rs->packet_len)) { 1198 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1199 if (ret < 0) { 1200 error_report("Notify Xen COLO-frame INIT failed"); 1201 } 1202 } else if (packet_matches_str("COLO_CHECKPOINT", 1203 notify_rs->buf, 1204 notify_rs->packet_len)) { 1205 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1206 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1207 } else { 1208 error_report("COLO compare got unsupported instruction"); 1209 } 1210 } 1211 1212 /* 1213 * Return 0 is success. 1214 * Return 1 is failed. 1215 */ 1216 static int find_and_check_chardev(Chardev **chr, 1217 char *chr_name, 1218 Error **errp) 1219 { 1220 *chr = qemu_chr_find(chr_name); 1221 if (*chr == NULL) { 1222 error_setg(errp, "Device '%s' not found", 1223 chr_name); 1224 return 1; 1225 } 1226 1227 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1228 error_setg(errp, "chardev \"%s\" is not reconnectable", 1229 chr_name); 1230 return 1; 1231 } 1232 1233 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1234 error_setg(errp, "chardev \"%s\" cannot switch context", 1235 chr_name); 1236 return 1; 1237 } 1238 1239 return 0; 1240 } 1241 1242 /* 1243 * Called from the main thread on the primary 1244 * to setup colo-compare. 1245 */ 1246 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1247 { 1248 CompareState *s = COLO_COMPARE(uc); 1249 Chardev *chr; 1250 1251 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1252 error_setg(errp, "colo compare needs 'primary_in' ," 1253 "'secondary_in','outdev','iothread' property set"); 1254 return; 1255 } else if (!strcmp(s->pri_indev, s->outdev) || 1256 !strcmp(s->sec_indev, s->outdev) || 1257 !strcmp(s->pri_indev, s->sec_indev)) { 1258 error_setg(errp, "'indev' and 'outdev' could not be same " 1259 "for compare module"); 1260 return; 1261 } 1262 1263 if (!s->compare_timeout) { 1264 /* Set default value to 3000 MS */ 1265 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1266 } 1267 1268 if (!s->expired_scan_cycle) { 1269 /* Set default value to 1000 MS */ 1270 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1271 } 1272 1273 if (!max_queue_size) { 1274 /* Set default queue size to 1024 */ 1275 max_queue_size = MAX_QUEUE_SIZE; 1276 } 1277 1278 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1279 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1280 return; 1281 } 1282 1283 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1284 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1285 return; 1286 } 1287 1288 if (find_and_check_chardev(&chr, s->outdev, errp) || 1289 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1290 return; 1291 } 1292 1293 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1294 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1295 1296 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1297 if (s->notify_dev) { 1298 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1299 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1300 return; 1301 } 1302 1303 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1304 s->vnet_hdr); 1305 } 1306 1307 s->out_sendco.s = s; 1308 s->out_sendco.chr = &s->chr_out; 1309 s->out_sendco.notify_remote_frame = false; 1310 s->out_sendco.done = true; 1311 g_queue_init(&s->out_sendco.send_list); 1312 1313 if (s->notify_dev) { 1314 s->notify_sendco.s = s; 1315 s->notify_sendco.chr = &s->chr_notify_dev; 1316 s->notify_sendco.notify_remote_frame = true; 1317 s->notify_sendco.done = true; 1318 g_queue_init(&s->notify_sendco.send_list); 1319 } 1320 1321 g_queue_init(&s->conn_list); 1322 1323 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1324 connection_key_equal, 1325 g_free, 1326 connection_destroy); 1327 1328 colo_compare_iothread(s); 1329 1330 qemu_mutex_lock(&colo_compare_mutex); 1331 if (!colo_compare_active) { 1332 qemu_mutex_init(&event_mtx); 1333 qemu_cond_init(&event_complete_cond); 1334 colo_compare_active = true; 1335 } 1336 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1337 qemu_mutex_unlock(&colo_compare_mutex); 1338 1339 return; 1340 } 1341 1342 static void colo_flush_packets(void *opaque, void *user_data) 1343 { 1344 CompareState *s = user_data; 1345 Connection *conn = opaque; 1346 Packet *pkt = NULL; 1347 1348 while (!g_queue_is_empty(&conn->primary_list)) { 1349 pkt = g_queue_pop_tail(&conn->primary_list); 1350 compare_chr_send(s, 1351 pkt->data, 1352 pkt->size, 1353 pkt->vnet_hdr_len, 1354 false, 1355 true); 1356 packet_destroy_partial(pkt, NULL); 1357 } 1358 while (!g_queue_is_empty(&conn->secondary_list)) { 1359 pkt = g_queue_pop_tail(&conn->secondary_list); 1360 packet_destroy(pkt, NULL); 1361 } 1362 } 1363 1364 static void colo_compare_class_init(ObjectClass *oc, void *data) 1365 { 1366 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1367 1368 ucc->complete = colo_compare_complete; 1369 } 1370 1371 static void colo_compare_init(Object *obj) 1372 { 1373 CompareState *s = COLO_COMPARE(obj); 1374 1375 object_property_add_str(obj, "primary_in", 1376 compare_get_pri_indev, compare_set_pri_indev); 1377 object_property_add_str(obj, "secondary_in", 1378 compare_get_sec_indev, compare_set_sec_indev); 1379 object_property_add_str(obj, "outdev", 1380 compare_get_outdev, compare_set_outdev); 1381 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1382 (Object **)&s->iothread, 1383 object_property_allow_set_link, 1384 OBJ_PROP_LINK_STRONG); 1385 /* This parameter just for Xen COLO */ 1386 object_property_add_str(obj, "notify_dev", 1387 compare_get_notify_dev, compare_set_notify_dev); 1388 1389 object_property_add(obj, "compare_timeout", "uint64", 1390 compare_get_timeout, 1391 compare_set_timeout, NULL, NULL); 1392 1393 object_property_add(obj, "expired_scan_cycle", "uint32", 1394 compare_get_expired_scan_cycle, 1395 compare_set_expired_scan_cycle, NULL, NULL); 1396 1397 object_property_add(obj, "max_queue_size", "uint32", 1398 get_max_queue_size, 1399 set_max_queue_size, NULL, NULL); 1400 1401 s->vnet_hdr = false; 1402 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1403 compare_set_vnet_hdr); 1404 } 1405 1406 void colo_compare_cleanup(void) 1407 { 1408 CompareState *tmp = NULL; 1409 CompareState *n = NULL; 1410 1411 QTAILQ_FOREACH_SAFE(tmp, &net_compares, next, n) { 1412 object_unparent(OBJECT(tmp)); 1413 } 1414 } 1415 1416 static void colo_compare_finalize(Object *obj) 1417 { 1418 CompareState *s = COLO_COMPARE(obj); 1419 CompareState *tmp = NULL; 1420 1421 qemu_mutex_lock(&colo_compare_mutex); 1422 QTAILQ_FOREACH(tmp, &net_compares, next) { 1423 if (tmp == s) { 1424 QTAILQ_REMOVE(&net_compares, s, next); 1425 break; 1426 } 1427 } 1428 if (QTAILQ_EMPTY(&net_compares)) { 1429 colo_compare_active = false; 1430 qemu_mutex_destroy(&event_mtx); 1431 qemu_cond_destroy(&event_complete_cond); 1432 } 1433 qemu_mutex_unlock(&colo_compare_mutex); 1434 1435 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1436 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1437 qemu_chr_fe_deinit(&s->chr_out, false); 1438 if (s->notify_dev) { 1439 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1440 } 1441 1442 colo_compare_timer_del(s); 1443 1444 qemu_bh_delete(s->event_bh); 1445 1446 AioContext *ctx = iothread_get_aio_context(s->iothread); 1447 aio_context_acquire(ctx); 1448 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1449 if (s->notify_dev) { 1450 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1451 } 1452 aio_context_release(ctx); 1453 1454 /* Release all unhandled packets after compare thead exited */ 1455 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1456 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1457 1458 g_queue_clear(&s->conn_list); 1459 g_queue_clear(&s->out_sendco.send_list); 1460 if (s->notify_dev) { 1461 g_queue_clear(&s->notify_sendco.send_list); 1462 } 1463 1464 if (s->connection_track_table) { 1465 g_hash_table_destroy(s->connection_track_table); 1466 } 1467 1468 object_unref(OBJECT(s->iothread)); 1469 1470 g_free(s->pri_indev); 1471 g_free(s->sec_indev); 1472 g_free(s->outdev); 1473 g_free(s->notify_dev); 1474 } 1475 1476 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1477 { 1478 colo_compare_active = false; 1479 qemu_mutex_init(&colo_compare_mutex); 1480 } 1481 1482 static const TypeInfo colo_compare_info = { 1483 .name = TYPE_COLO_COMPARE, 1484 .parent = TYPE_OBJECT, 1485 .instance_size = sizeof(CompareState), 1486 .instance_init = colo_compare_init, 1487 .instance_finalize = colo_compare_finalize, 1488 .class_size = sizeof(CompareClass), 1489 .class_init = colo_compare_class_init, 1490 .interfaces = (InterfaceInfo[]) { 1491 { TYPE_USER_CREATABLE }, 1492 { } 1493 } 1494 }; 1495 1496 static void register_types(void) 1497 { 1498 type_register_static(&colo_compare_info); 1499 } 1500 1501 type_init(register_types); 1502