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 typedef struct CompareState CompareState; 40 DECLARE_INSTANCE_CHECKER(CompareState, COLO_COMPARE, 41 TYPE_COLO_COMPARE) 42 43 static QTAILQ_HEAD(, CompareState) net_compares = 44 QTAILQ_HEAD_INITIALIZER(net_compares); 45 46 static NotifierList colo_compare_notifiers = 47 NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers); 48 49 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 50 #define MAX_QUEUE_SIZE 1024 51 52 #define COLO_COMPARE_FREE_PRIMARY 0x01 53 #define COLO_COMPARE_FREE_SECONDARY 0x02 54 55 #define REGULAR_PACKET_CHECK_MS 1000 56 #define DEFAULT_TIME_OUT_MS 3000 57 58 /* #define DEBUG_COLO_PACKETS */ 59 60 static QemuMutex colo_compare_mutex; 61 static bool colo_compare_active; 62 static QemuMutex event_mtx; 63 static QemuCond event_complete_cond; 64 static int event_unhandled_count; 65 static uint32_t max_queue_size; 66 67 /* 68 * + CompareState ++ 69 * | | 70 * +---------------+ +---------------+ +---------------+ 71 * | conn list + - > conn + ------- > conn + -- > ...... 72 * +---------------+ +---------------+ +---------------+ 73 * | | | | | | 74 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 75 * |primary | |secondary |primary | |secondary 76 * |packet | |packet + |packet | |packet + 77 * +--------+ +--------+ +--------+ +--------+ 78 * | | | | 79 * +---v----+ +---v----+ +---v----+ +---v----+ 80 * |primary | |secondary |primary | |secondary 81 * |packet | |packet + |packet | |packet + 82 * +--------+ +--------+ +--------+ +--------+ 83 * | | | | 84 * +---v----+ +---v----+ +---v----+ +---v----+ 85 * |primary | |secondary |primary | |secondary 86 * |packet | |packet + |packet | |packet + 87 * +--------+ +--------+ +--------+ +--------+ 88 */ 89 90 typedef struct SendCo { 91 Coroutine *co; 92 struct CompareState *s; 93 CharBackend *chr; 94 GQueue send_list; 95 bool notify_remote_frame; 96 bool done; 97 int ret; 98 } SendCo; 99 100 typedef struct SendEntry { 101 uint32_t size; 102 uint32_t vnet_hdr_len; 103 uint8_t *buf; 104 } SendEntry; 105 106 struct CompareState { 107 Object parent; 108 109 char *pri_indev; 110 char *sec_indev; 111 char *outdev; 112 char *notify_dev; 113 CharBackend chr_pri_in; 114 CharBackend chr_sec_in; 115 CharBackend chr_out; 116 CharBackend chr_notify_dev; 117 SocketReadState pri_rs; 118 SocketReadState sec_rs; 119 SocketReadState notify_rs; 120 SendCo out_sendco; 121 SendCo notify_sendco; 122 bool vnet_hdr; 123 uint64_t compare_timeout; 124 uint32_t expired_scan_cycle; 125 126 /* 127 * Record the connection that through the NIC 128 * Element type: Connection 129 */ 130 GQueue conn_list; 131 /* Record the connection without repetition */ 132 GHashTable *connection_track_table; 133 134 IOThread *iothread; 135 GMainContext *worker_context; 136 QEMUTimer *packet_check_timer; 137 138 QEMUBH *event_bh; 139 enum colo_event event; 140 141 QTAILQ_ENTRY(CompareState) next; 142 }; 143 144 typedef struct CompareClass { 145 ObjectClass parent_class; 146 } CompareClass; 147 148 enum { 149 PRIMARY_IN = 0, 150 SECONDARY_IN, 151 }; 152 153 static const char *colo_mode[] = { 154 [PRIMARY_IN] = "primary", 155 [SECONDARY_IN] = "secondary", 156 }; 157 158 static int compare_chr_send(CompareState *s, 159 uint8_t *buf, 160 uint32_t size, 161 uint32_t vnet_hdr_len, 162 bool notify_remote_frame, 163 bool zero_copy); 164 165 static bool packet_matches_str(const char *str, 166 const uint8_t *buf, 167 uint32_t packet_len) 168 { 169 if (packet_len != strlen(str)) { 170 return false; 171 } 172 173 return !memcmp(str, buf, packet_len); 174 } 175 176 static void notify_remote_frame(CompareState *s) 177 { 178 char msg[] = "DO_CHECKPOINT"; 179 int ret = 0; 180 181 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 182 if (ret < 0) { 183 error_report("Notify Xen COLO-frame failed"); 184 } 185 } 186 187 static void colo_compare_inconsistency_notify(CompareState *s) 188 { 189 if (s->notify_dev) { 190 notify_remote_frame(s); 191 } else { 192 notifier_list_notify(&colo_compare_notifiers, 193 migrate_get_current()); 194 } 195 } 196 197 /* Use restricted to colo_insert_packet() */ 198 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 199 { 200 return a->tcp_seq - b->tcp_seq; 201 } 202 203 static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) 204 { 205 Packet *pkt = data; 206 struct tcp_hdr *tcphd; 207 208 tcphd = (struct tcp_hdr *)pkt->transport_header; 209 210 pkt->tcp_seq = ntohl(tcphd->th_seq); 211 pkt->tcp_ack = ntohl(tcphd->th_ack); 212 /* Need to consider ACK will bigger than uint32_t MAX */ 213 *max_ack = pkt->tcp_ack - *max_ack > 0 ? pkt->tcp_ack : *max_ack; 214 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 215 + (tcphd->th_off << 2); 216 pkt->payload_size = pkt->size - pkt->header_size; 217 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 218 pkt->flags = tcphd->th_flags; 219 } 220 221 /* 222 * Return 1 on success, if return 0 means the 223 * packet will be dropped 224 */ 225 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 226 { 227 if (g_queue_get_length(queue) <= max_queue_size) { 228 if (pkt->ip->ip_p == IPPROTO_TCP) { 229 fill_pkt_tcp_info(pkt, max_ack); 230 g_queue_insert_sorted(queue, 231 pkt, 232 (GCompareDataFunc)seq_sorter, 233 NULL); 234 } else { 235 g_queue_push_tail(queue, pkt); 236 } 237 return 1; 238 } 239 return 0; 240 } 241 242 /* 243 * Return 0 on success, if return -1 means the pkt 244 * is unsupported(arp and ipv6) and will be sent later 245 */ 246 static int packet_enqueue(CompareState *s, int mode, Connection **con) 247 { 248 ConnectionKey key; 249 Packet *pkt = NULL; 250 Connection *conn; 251 int ret; 252 253 if (mode == PRIMARY_IN) { 254 pkt = packet_new(s->pri_rs.buf, 255 s->pri_rs.packet_len, 256 s->pri_rs.vnet_hdr_len); 257 } else { 258 pkt = packet_new(s->sec_rs.buf, 259 s->sec_rs.packet_len, 260 s->sec_rs.vnet_hdr_len); 261 } 262 263 if (parse_packet_early(pkt)) { 264 packet_destroy(pkt, NULL); 265 pkt = NULL; 266 return -1; 267 } 268 fill_connection_key(pkt, &key, false); 269 270 conn = connection_get(s->connection_track_table, 271 &key, 272 &s->conn_list); 273 274 if (!conn->processing) { 275 g_queue_push_tail(&s->conn_list, conn); 276 conn->processing = true; 277 } 278 279 if (mode == PRIMARY_IN) { 280 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 281 } else { 282 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 283 } 284 285 if (!ret) { 286 trace_colo_compare_drop_packet(colo_mode[mode], 287 "queue size too big, drop packet"); 288 packet_destroy(pkt, NULL); 289 pkt = NULL; 290 } 291 292 *con = conn; 293 294 return 0; 295 } 296 297 static inline bool after(uint32_t seq1, uint32_t seq2) 298 { 299 return (int32_t)(seq1 - seq2) > 0; 300 } 301 302 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 303 { 304 int ret; 305 ret = compare_chr_send(s, 306 pkt->data, 307 pkt->size, 308 pkt->vnet_hdr_len, 309 false, 310 true); 311 if (ret < 0) { 312 error_report("colo send primary packet failed"); 313 } 314 trace_colo_compare_main("packet same and release packet"); 315 packet_destroy_partial(pkt, NULL); 316 } 317 318 /* 319 * The IP packets sent by primary and secondary 320 * will be compared in here 321 * TODO support ip fragment, Out-Of-Order 322 * return: 0 means packet same 323 * > 0 || < 0 means packet different 324 */ 325 static int colo_compare_packet_payload(Packet *ppkt, 326 Packet *spkt, 327 uint16_t poffset, 328 uint16_t soffset, 329 uint16_t len) 330 331 { 332 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 333 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 334 335 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 336 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 337 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 338 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 339 340 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 341 pri_ip_dst, spkt->size, 342 sec_ip_src, sec_ip_dst); 343 } 344 345 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 346 } 347 348 /* 349 * return true means that the payload is consist and 350 * need to make the next comparison, false means do 351 * the checkpoint 352 */ 353 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 354 int8_t *mark, uint32_t max_ack) 355 { 356 *mark = 0; 357 358 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 359 if (!colo_compare_packet_payload(ppkt, spkt, 360 ppkt->header_size, spkt->header_size, 361 ppkt->payload_size)) { 362 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 363 return true; 364 } 365 } 366 367 /* one part of secondary packet payload still need to be compared */ 368 if (!after(ppkt->seq_end, spkt->seq_end)) { 369 if (!colo_compare_packet_payload(ppkt, spkt, 370 ppkt->header_size + ppkt->offset, 371 spkt->header_size + spkt->offset, 372 ppkt->payload_size - ppkt->offset)) { 373 if (!after(ppkt->tcp_ack, max_ack)) { 374 *mark = COLO_COMPARE_FREE_PRIMARY; 375 spkt->offset += ppkt->payload_size - ppkt->offset; 376 return true; 377 } else { 378 /* secondary guest hasn't ack the data, don't send 379 * out this packet 380 */ 381 return false; 382 } 383 } 384 } else { 385 /* primary packet is longer than secondary packet, compare 386 * the same part and mark the primary packet offset 387 */ 388 if (!colo_compare_packet_payload(ppkt, spkt, 389 ppkt->header_size + ppkt->offset, 390 spkt->header_size + spkt->offset, 391 spkt->payload_size - spkt->offset)) { 392 *mark = COLO_COMPARE_FREE_SECONDARY; 393 ppkt->offset += spkt->payload_size - spkt->offset; 394 return true; 395 } 396 } 397 398 return false; 399 } 400 401 static void colo_compare_tcp(CompareState *s, Connection *conn) 402 { 403 Packet *ppkt = NULL, *spkt = NULL; 404 int8_t mark; 405 406 /* 407 * If ppkt and spkt have the same payload, but ppkt's ACK 408 * is greater than spkt's ACK, in this case we can not 409 * send the ppkt because it will cause the secondary guest 410 * to miss sending some data in the next. Therefore, we 411 * record the maximum ACK in the current queue at both 412 * primary side and secondary side. Only when the ack is 413 * less than the smaller of the two maximum ack, then we 414 * can ensure that the packet's payload is acknowledged by 415 * primary and secondary. 416 */ 417 uint32_t min_ack = conn->pack - conn->sack > 0 ? 418 conn->sack : conn->pack; 419 420 pri: 421 if (g_queue_is_empty(&conn->primary_list)) { 422 return; 423 } 424 ppkt = g_queue_pop_head(&conn->primary_list); 425 sec: 426 if (g_queue_is_empty(&conn->secondary_list)) { 427 g_queue_push_head(&conn->primary_list, ppkt); 428 return; 429 } 430 spkt = g_queue_pop_head(&conn->secondary_list); 431 432 if (ppkt->tcp_seq == ppkt->seq_end) { 433 colo_release_primary_pkt(s, ppkt); 434 ppkt = NULL; 435 } 436 437 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 438 trace_colo_compare_main("pri: this packet has compared"); 439 colo_release_primary_pkt(s, ppkt); 440 ppkt = NULL; 441 } 442 443 if (spkt->tcp_seq == spkt->seq_end) { 444 packet_destroy(spkt, NULL); 445 if (!ppkt) { 446 goto pri; 447 } else { 448 goto sec; 449 } 450 } else { 451 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 452 trace_colo_compare_main("sec: this packet has compared"); 453 packet_destroy(spkt, NULL); 454 if (!ppkt) { 455 goto pri; 456 } else { 457 goto sec; 458 } 459 } 460 if (!ppkt) { 461 g_queue_push_head(&conn->secondary_list, spkt); 462 goto pri; 463 } 464 } 465 466 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 467 trace_colo_compare_tcp_info("pri", 468 ppkt->tcp_seq, ppkt->tcp_ack, 469 ppkt->header_size, ppkt->payload_size, 470 ppkt->offset, ppkt->flags); 471 472 trace_colo_compare_tcp_info("sec", 473 spkt->tcp_seq, spkt->tcp_ack, 474 spkt->header_size, spkt->payload_size, 475 spkt->offset, spkt->flags); 476 477 if (mark == COLO_COMPARE_FREE_PRIMARY) { 478 conn->compare_seq = ppkt->seq_end; 479 colo_release_primary_pkt(s, ppkt); 480 g_queue_push_head(&conn->secondary_list, spkt); 481 goto pri; 482 } else if (mark == COLO_COMPARE_FREE_SECONDARY) { 483 conn->compare_seq = spkt->seq_end; 484 packet_destroy(spkt, NULL); 485 goto sec; 486 } else if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 487 conn->compare_seq = ppkt->seq_end; 488 colo_release_primary_pkt(s, ppkt); 489 packet_destroy(spkt, NULL); 490 goto pri; 491 } 492 } else { 493 g_queue_push_head(&conn->primary_list, ppkt); 494 g_queue_push_head(&conn->secondary_list, spkt); 495 496 #ifdef DEBUG_COLO_PACKETS 497 qemu_hexdump(stderr, "colo-compare ppkt", ppkt->data, ppkt->size); 498 qemu_hexdump(stderr, "colo-compare spkt", spkt->data, spkt->size); 499 #endif 500 501 colo_compare_inconsistency_notify(s); 502 } 503 } 504 505 506 /* 507 * Called from the compare thread on the primary 508 * for compare udp packet 509 */ 510 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 511 { 512 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 513 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 514 515 trace_colo_compare_main("compare udp"); 516 517 /* 518 * Because of ppkt and spkt are both in the same connection, 519 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 520 * same with spkt. In addition, IP header's Identification is a random 521 * field, we can handle it in IP fragmentation function later. 522 * COLO just concern the response net packet payload from primary guest 523 * and secondary guest are same or not, So we ignored all IP header include 524 * other field like TOS,TTL,IP Checksum. we only need to compare 525 * the ip payload here. 526 */ 527 if (ppkt->size != spkt->size) { 528 trace_colo_compare_main("UDP: payload size of packets are different"); 529 return -1; 530 } 531 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 532 ppkt->size - offset)) { 533 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 534 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 535 #ifdef DEBUG_COLO_PACKETS 536 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 537 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 538 #endif 539 return -1; 540 } else { 541 return 0; 542 } 543 } 544 545 /* 546 * Called from the compare thread on the primary 547 * for compare icmp packet 548 */ 549 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 550 { 551 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 552 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 553 554 trace_colo_compare_main("compare icmp"); 555 556 /* 557 * Because of ppkt and spkt are both in the same connection, 558 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 559 * same with spkt. In addition, IP header's Identification is a random 560 * field, we can handle it in IP fragmentation function later. 561 * COLO just concern the response net packet payload from primary guest 562 * and secondary guest are same or not, So we ignored all IP header include 563 * other field like TOS,TTL,IP Checksum. we only need to compare 564 * the ip payload here. 565 */ 566 if (ppkt->size != spkt->size) { 567 trace_colo_compare_main("ICMP: payload size of packets are different"); 568 return -1; 569 } 570 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 571 ppkt->size - offset)) { 572 trace_colo_compare_icmp_miscompare("primary pkt size", 573 ppkt->size); 574 trace_colo_compare_icmp_miscompare("Secondary pkt size", 575 spkt->size); 576 #ifdef DEBUG_COLO_PACKETS 577 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 578 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 579 #endif 580 return -1; 581 } else { 582 return 0; 583 } 584 } 585 586 /* 587 * Called from the compare thread on the primary 588 * for compare other packet 589 */ 590 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 591 { 592 uint16_t offset = ppkt->vnet_hdr_len; 593 594 trace_colo_compare_main("compare other"); 595 if (ppkt->size != spkt->size) { 596 trace_colo_compare_main("Other: payload size of packets are different"); 597 return -1; 598 } 599 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 600 ppkt->size - offset); 601 } 602 603 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 604 { 605 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 606 607 if ((now - pkt->creation_ms) > (*check_time)) { 608 trace_colo_old_packet_check_found(pkt->creation_ms); 609 return 0; 610 } else { 611 return 1; 612 } 613 } 614 615 void colo_compare_register_notifier(Notifier *notify) 616 { 617 notifier_list_add(&colo_compare_notifiers, notify); 618 } 619 620 void colo_compare_unregister_notifier(Notifier *notify) 621 { 622 notifier_remove(notify); 623 } 624 625 static int colo_old_packet_check_one_conn(Connection *conn, 626 CompareState *s) 627 { 628 if (!g_queue_is_empty(&conn->primary_list)) { 629 if (g_queue_find_custom(&conn->primary_list, 630 &s->compare_timeout, 631 (GCompareFunc)colo_old_packet_check_one)) 632 goto out; 633 } 634 635 if (!g_queue_is_empty(&conn->secondary_list)) { 636 if (g_queue_find_custom(&conn->secondary_list, 637 &s->compare_timeout, 638 (GCompareFunc)colo_old_packet_check_one)) 639 goto out; 640 } 641 642 return 1; 643 644 out: 645 /* Do checkpoint will flush old packet */ 646 colo_compare_inconsistency_notify(s); 647 return 0; 648 } 649 650 /* 651 * Look for old packets that the secondary hasn't matched, 652 * if we have some then we have to checkpoint to wake 653 * the secondary up. 654 */ 655 static void colo_old_packet_check(void *opaque) 656 { 657 CompareState *s = opaque; 658 659 /* 660 * If we find one old packet, stop finding job and notify 661 * COLO frame do checkpoint. 662 */ 663 g_queue_find_custom(&s->conn_list, s, 664 (GCompareFunc)colo_old_packet_check_one_conn); 665 } 666 667 static void colo_compare_packet(CompareState *s, Connection *conn, 668 int (*HandlePacket)(Packet *spkt, 669 Packet *ppkt)) 670 { 671 Packet *pkt = NULL; 672 GList *result = NULL; 673 674 while (!g_queue_is_empty(&conn->primary_list) && 675 !g_queue_is_empty(&conn->secondary_list)) { 676 pkt = g_queue_pop_head(&conn->primary_list); 677 result = g_queue_find_custom(&conn->secondary_list, 678 pkt, (GCompareFunc)HandlePacket); 679 680 if (result) { 681 colo_release_primary_pkt(s, pkt); 682 packet_destroy(result->data, NULL); 683 g_queue_delete_link(&conn->secondary_list, result); 684 } else { 685 /* 686 * If one packet arrive late, the secondary_list or 687 * primary_list will be empty, so we can't compare it 688 * until next comparison. If the packets in the list are 689 * timeout, it will trigger a checkpoint request. 690 */ 691 trace_colo_compare_main("packet different"); 692 g_queue_push_head(&conn->primary_list, pkt); 693 694 colo_compare_inconsistency_notify(s); 695 break; 696 } 697 } 698 } 699 700 /* 701 * Called from the compare thread on the primary 702 * for compare packet with secondary list of the 703 * specified connection when a new packet was 704 * queued to it. 705 */ 706 static void colo_compare_connection(void *opaque, void *user_data) 707 { 708 CompareState *s = user_data; 709 Connection *conn = opaque; 710 711 switch (conn->ip_proto) { 712 case IPPROTO_TCP: 713 colo_compare_tcp(s, conn); 714 break; 715 case IPPROTO_UDP: 716 colo_compare_packet(s, conn, colo_packet_compare_udp); 717 break; 718 case IPPROTO_ICMP: 719 colo_compare_packet(s, conn, colo_packet_compare_icmp); 720 break; 721 default: 722 colo_compare_packet(s, conn, colo_packet_compare_other); 723 break; 724 } 725 } 726 727 static void coroutine_fn _compare_chr_send(void *opaque) 728 { 729 SendCo *sendco = opaque; 730 CompareState *s = sendco->s; 731 int ret = 0; 732 733 while (!g_queue_is_empty(&sendco->send_list)) { 734 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 735 uint32_t len = htonl(entry->size); 736 737 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 738 739 if (ret != sizeof(len)) { 740 g_free(entry->buf); 741 g_slice_free(SendEntry, entry); 742 goto err; 743 } 744 745 if (!sendco->notify_remote_frame && s->vnet_hdr) { 746 /* 747 * We send vnet header len make other module(like filter-redirector) 748 * know how to parse net packet correctly. 749 */ 750 len = htonl(entry->vnet_hdr_len); 751 752 ret = qemu_chr_fe_write_all(sendco->chr, 753 (uint8_t *)&len, 754 sizeof(len)); 755 756 if (ret != sizeof(len)) { 757 g_free(entry->buf); 758 g_slice_free(SendEntry, entry); 759 goto err; 760 } 761 } 762 763 ret = qemu_chr_fe_write_all(sendco->chr, 764 (uint8_t *)entry->buf, 765 entry->size); 766 767 if (ret != entry->size) { 768 g_free(entry->buf); 769 g_slice_free(SendEntry, entry); 770 goto err; 771 } 772 773 g_free(entry->buf); 774 g_slice_free(SendEntry, entry); 775 } 776 777 sendco->ret = 0; 778 goto out; 779 780 err: 781 while (!g_queue_is_empty(&sendco->send_list)) { 782 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 783 g_free(entry->buf); 784 g_slice_free(SendEntry, entry); 785 } 786 sendco->ret = ret < 0 ? ret : -EIO; 787 out: 788 sendco->co = NULL; 789 sendco->done = true; 790 aio_wait_kick(); 791 } 792 793 static int compare_chr_send(CompareState *s, 794 uint8_t *buf, 795 uint32_t size, 796 uint32_t vnet_hdr_len, 797 bool notify_remote_frame, 798 bool zero_copy) 799 { 800 SendCo *sendco; 801 SendEntry *entry; 802 803 if (notify_remote_frame) { 804 sendco = &s->notify_sendco; 805 } else { 806 sendco = &s->out_sendco; 807 } 808 809 if (!size) { 810 return -1; 811 } 812 813 entry = g_slice_new(SendEntry); 814 entry->size = size; 815 entry->vnet_hdr_len = vnet_hdr_len; 816 if (zero_copy) { 817 entry->buf = buf; 818 } else { 819 entry->buf = g_malloc(size); 820 memcpy(entry->buf, buf, size); 821 } 822 g_queue_push_head(&sendco->send_list, entry); 823 824 if (sendco->done) { 825 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 826 sendco->done = false; 827 qemu_coroutine_enter(sendco->co); 828 if (sendco->done) { 829 /* report early errors */ 830 return sendco->ret; 831 } 832 } 833 834 /* assume success */ 835 return 0; 836 } 837 838 static int compare_chr_can_read(void *opaque) 839 { 840 return COMPARE_READ_LEN_MAX; 841 } 842 843 /* 844 * Called from the main thread on the primary for packets 845 * arriving over the socket from the primary. 846 */ 847 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 848 { 849 CompareState *s = COLO_COMPARE(opaque); 850 int ret; 851 852 ret = net_fill_rstate(&s->pri_rs, buf, size); 853 if (ret == -1) { 854 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 855 NULL, NULL, true); 856 error_report("colo-compare primary_in error"); 857 } 858 } 859 860 /* 861 * Called from the main thread on the primary for packets 862 * arriving over the socket from the secondary. 863 */ 864 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 865 { 866 CompareState *s = COLO_COMPARE(opaque); 867 int ret; 868 869 ret = net_fill_rstate(&s->sec_rs, buf, size); 870 if (ret == -1) { 871 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 872 NULL, NULL, true); 873 error_report("colo-compare secondary_in error"); 874 } 875 } 876 877 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 878 { 879 CompareState *s = COLO_COMPARE(opaque); 880 int ret; 881 882 ret = net_fill_rstate(&s->notify_rs, buf, size); 883 if (ret == -1) { 884 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 885 NULL, NULL, true); 886 error_report("colo-compare notify_dev error"); 887 } 888 } 889 890 /* 891 * Check old packet regularly so it can watch for any packets 892 * that the secondary hasn't produced equivalents of. 893 */ 894 static void check_old_packet_regular(void *opaque) 895 { 896 CompareState *s = opaque; 897 898 /* if have old packet we will notify checkpoint */ 899 colo_old_packet_check(s); 900 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 901 s->expired_scan_cycle); 902 } 903 904 /* Public API, Used for COLO frame to notify compare event */ 905 void colo_notify_compares_event(void *opaque, int event, Error **errp) 906 { 907 CompareState *s; 908 qemu_mutex_lock(&colo_compare_mutex); 909 910 if (!colo_compare_active) { 911 qemu_mutex_unlock(&colo_compare_mutex); 912 return; 913 } 914 915 qemu_mutex_lock(&event_mtx); 916 QTAILQ_FOREACH(s, &net_compares, next) { 917 s->event = event; 918 qemu_bh_schedule(s->event_bh); 919 event_unhandled_count++; 920 } 921 /* Wait all compare threads to finish handling this event */ 922 while (event_unhandled_count > 0) { 923 qemu_cond_wait(&event_complete_cond, &event_mtx); 924 } 925 926 qemu_mutex_unlock(&event_mtx); 927 qemu_mutex_unlock(&colo_compare_mutex); 928 } 929 930 static void colo_compare_timer_init(CompareState *s) 931 { 932 AioContext *ctx = iothread_get_aio_context(s->iothread); 933 934 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_HOST, 935 SCALE_MS, check_old_packet_regular, 936 s); 937 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 938 s->expired_scan_cycle); 939 } 940 941 static void colo_compare_timer_del(CompareState *s) 942 { 943 if (s->packet_check_timer) { 944 timer_free(s->packet_check_timer); 945 s->packet_check_timer = NULL; 946 } 947 } 948 949 static void colo_flush_packets(void *opaque, void *user_data); 950 951 static void colo_compare_handle_event(void *opaque) 952 { 953 CompareState *s = opaque; 954 955 switch (s->event) { 956 case COLO_EVENT_CHECKPOINT: 957 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 958 break; 959 case COLO_EVENT_FAILOVER: 960 break; 961 default: 962 break; 963 } 964 965 qemu_mutex_lock(&event_mtx); 966 assert(event_unhandled_count > 0); 967 event_unhandled_count--; 968 qemu_cond_broadcast(&event_complete_cond); 969 qemu_mutex_unlock(&event_mtx); 970 } 971 972 static void colo_compare_iothread(CompareState *s) 973 { 974 AioContext *ctx = iothread_get_aio_context(s->iothread); 975 object_ref(OBJECT(s->iothread)); 976 s->worker_context = iothread_get_g_main_context(s->iothread); 977 978 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 979 compare_pri_chr_in, NULL, NULL, 980 s, s->worker_context, true); 981 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 982 compare_sec_chr_in, NULL, NULL, 983 s, s->worker_context, true); 984 if (s->notify_dev) { 985 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 986 compare_notify_chr, NULL, NULL, 987 s, s->worker_context, true); 988 } 989 990 colo_compare_timer_init(s); 991 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 992 } 993 994 static char *compare_get_pri_indev(Object *obj, Error **errp) 995 { 996 CompareState *s = COLO_COMPARE(obj); 997 998 return g_strdup(s->pri_indev); 999 } 1000 1001 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1002 { 1003 CompareState *s = COLO_COMPARE(obj); 1004 1005 g_free(s->pri_indev); 1006 s->pri_indev = g_strdup(value); 1007 } 1008 1009 static char *compare_get_sec_indev(Object *obj, Error **errp) 1010 { 1011 CompareState *s = COLO_COMPARE(obj); 1012 1013 return g_strdup(s->sec_indev); 1014 } 1015 1016 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1017 { 1018 CompareState *s = COLO_COMPARE(obj); 1019 1020 g_free(s->sec_indev); 1021 s->sec_indev = g_strdup(value); 1022 } 1023 1024 static char *compare_get_outdev(Object *obj, Error **errp) 1025 { 1026 CompareState *s = COLO_COMPARE(obj); 1027 1028 return g_strdup(s->outdev); 1029 } 1030 1031 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1032 { 1033 CompareState *s = COLO_COMPARE(obj); 1034 1035 g_free(s->outdev); 1036 s->outdev = g_strdup(value); 1037 } 1038 1039 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1040 { 1041 CompareState *s = COLO_COMPARE(obj); 1042 1043 return s->vnet_hdr; 1044 } 1045 1046 static void compare_set_vnet_hdr(Object *obj, 1047 bool value, 1048 Error **errp) 1049 { 1050 CompareState *s = COLO_COMPARE(obj); 1051 1052 s->vnet_hdr = value; 1053 } 1054 1055 static char *compare_get_notify_dev(Object *obj, Error **errp) 1056 { 1057 CompareState *s = COLO_COMPARE(obj); 1058 1059 return g_strdup(s->notify_dev); 1060 } 1061 1062 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1063 { 1064 CompareState *s = COLO_COMPARE(obj); 1065 1066 g_free(s->notify_dev); 1067 s->notify_dev = g_strdup(value); 1068 } 1069 1070 static void compare_get_timeout(Object *obj, Visitor *v, 1071 const char *name, void *opaque, 1072 Error **errp) 1073 { 1074 CompareState *s = COLO_COMPARE(obj); 1075 uint64_t value = s->compare_timeout; 1076 1077 visit_type_uint64(v, name, &value, errp); 1078 } 1079 1080 static void compare_set_timeout(Object *obj, Visitor *v, 1081 const char *name, void *opaque, 1082 Error **errp) 1083 { 1084 CompareState *s = COLO_COMPARE(obj); 1085 uint32_t value; 1086 1087 if (!visit_type_uint32(v, name, &value, errp)) { 1088 return; 1089 } 1090 if (!value) { 1091 error_setg(errp, "Property '%s.%s' requires a positive value", 1092 object_get_typename(obj), name); 1093 return; 1094 } 1095 s->compare_timeout = value; 1096 } 1097 1098 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1099 const char *name, void *opaque, 1100 Error **errp) 1101 { 1102 CompareState *s = COLO_COMPARE(obj); 1103 uint32_t value = s->expired_scan_cycle; 1104 1105 visit_type_uint32(v, name, &value, errp); 1106 } 1107 1108 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1109 const char *name, void *opaque, 1110 Error **errp) 1111 { 1112 CompareState *s = COLO_COMPARE(obj); 1113 uint32_t value; 1114 1115 if (!visit_type_uint32(v, name, &value, errp)) { 1116 return; 1117 } 1118 if (!value) { 1119 error_setg(errp, "Property '%s.%s' requires a positive value", 1120 object_get_typename(obj), name); 1121 return; 1122 } 1123 s->expired_scan_cycle = value; 1124 } 1125 1126 static void get_max_queue_size(Object *obj, Visitor *v, 1127 const char *name, void *opaque, 1128 Error **errp) 1129 { 1130 uint32_t value = max_queue_size; 1131 1132 visit_type_uint32(v, name, &value, errp); 1133 } 1134 1135 static void set_max_queue_size(Object *obj, Visitor *v, 1136 const char *name, void *opaque, 1137 Error **errp) 1138 { 1139 Error *local_err = NULL; 1140 uint64_t value; 1141 1142 visit_type_uint64(v, name, &value, &local_err); 1143 if (local_err) { 1144 goto out; 1145 } 1146 if (!value) { 1147 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1148 object_get_typename(obj), name); 1149 goto out; 1150 } 1151 max_queue_size = value; 1152 1153 out: 1154 error_propagate(errp, local_err); 1155 } 1156 1157 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1158 { 1159 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1160 Connection *conn = NULL; 1161 1162 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1163 trace_colo_compare_main("primary: unsupported packet in"); 1164 compare_chr_send(s, 1165 pri_rs->buf, 1166 pri_rs->packet_len, 1167 pri_rs->vnet_hdr_len, 1168 false, 1169 false); 1170 } else { 1171 /* compare packet in the specified connection */ 1172 colo_compare_connection(conn, s); 1173 } 1174 } 1175 1176 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1177 { 1178 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1179 Connection *conn = NULL; 1180 1181 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1182 trace_colo_compare_main("secondary: unsupported packet in"); 1183 } else { 1184 /* compare packet in the specified connection */ 1185 colo_compare_connection(conn, s); 1186 } 1187 } 1188 1189 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1190 { 1191 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1192 1193 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1194 int ret; 1195 1196 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1197 notify_rs->buf, 1198 notify_rs->packet_len)) { 1199 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1200 if (ret < 0) { 1201 error_report("Notify Xen COLO-frame INIT failed"); 1202 } 1203 } else if (packet_matches_str("COLO_CHECKPOINT", 1204 notify_rs->buf, 1205 notify_rs->packet_len)) { 1206 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1207 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1208 } else { 1209 error_report("COLO compare got unsupported instruction"); 1210 } 1211 } 1212 1213 /* 1214 * Return 0 is success. 1215 * Return 1 is failed. 1216 */ 1217 static int find_and_check_chardev(Chardev **chr, 1218 char *chr_name, 1219 Error **errp) 1220 { 1221 *chr = qemu_chr_find(chr_name); 1222 if (*chr == NULL) { 1223 error_setg(errp, "Device '%s' not found", 1224 chr_name); 1225 return 1; 1226 } 1227 1228 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1229 error_setg(errp, "chardev \"%s\" is not reconnectable", 1230 chr_name); 1231 return 1; 1232 } 1233 1234 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1235 error_setg(errp, "chardev \"%s\" cannot switch context", 1236 chr_name); 1237 return 1; 1238 } 1239 1240 return 0; 1241 } 1242 1243 /* 1244 * Called from the main thread on the primary 1245 * to setup colo-compare. 1246 */ 1247 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1248 { 1249 CompareState *s = COLO_COMPARE(uc); 1250 Chardev *chr; 1251 1252 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1253 error_setg(errp, "colo compare needs 'primary_in' ," 1254 "'secondary_in','outdev','iothread' property set"); 1255 return; 1256 } else if (!strcmp(s->pri_indev, s->outdev) || 1257 !strcmp(s->sec_indev, s->outdev) || 1258 !strcmp(s->pri_indev, s->sec_indev)) { 1259 error_setg(errp, "'indev' and 'outdev' could not be same " 1260 "for compare module"); 1261 return; 1262 } 1263 1264 if (!s->compare_timeout) { 1265 /* Set default value to 3000 MS */ 1266 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1267 } 1268 1269 if (!s->expired_scan_cycle) { 1270 /* Set default value to 3000 MS */ 1271 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1272 } 1273 1274 if (!max_queue_size) { 1275 /* Set default queue size to 1024 */ 1276 max_queue_size = MAX_QUEUE_SIZE; 1277 } 1278 1279 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1280 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1281 return; 1282 } 1283 1284 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1285 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1286 return; 1287 } 1288 1289 if (find_and_check_chardev(&chr, s->outdev, errp) || 1290 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1291 return; 1292 } 1293 1294 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1295 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1296 1297 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1298 if (s->notify_dev) { 1299 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1300 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1301 return; 1302 } 1303 1304 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1305 s->vnet_hdr); 1306 } 1307 1308 s->out_sendco.s = s; 1309 s->out_sendco.chr = &s->chr_out; 1310 s->out_sendco.notify_remote_frame = false; 1311 s->out_sendco.done = true; 1312 g_queue_init(&s->out_sendco.send_list); 1313 1314 if (s->notify_dev) { 1315 s->notify_sendco.s = s; 1316 s->notify_sendco.chr = &s->chr_notify_dev; 1317 s->notify_sendco.notify_remote_frame = true; 1318 s->notify_sendco.done = true; 1319 g_queue_init(&s->notify_sendco.send_list); 1320 } 1321 1322 g_queue_init(&s->conn_list); 1323 1324 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1325 connection_key_equal, 1326 g_free, 1327 connection_destroy); 1328 1329 colo_compare_iothread(s); 1330 1331 qemu_mutex_lock(&colo_compare_mutex); 1332 if (!colo_compare_active) { 1333 qemu_mutex_init(&event_mtx); 1334 qemu_cond_init(&event_complete_cond); 1335 colo_compare_active = true; 1336 } 1337 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1338 qemu_mutex_unlock(&colo_compare_mutex); 1339 1340 return; 1341 } 1342 1343 static void colo_flush_packets(void *opaque, void *user_data) 1344 { 1345 CompareState *s = user_data; 1346 Connection *conn = opaque; 1347 Packet *pkt = NULL; 1348 1349 while (!g_queue_is_empty(&conn->primary_list)) { 1350 pkt = g_queue_pop_head(&conn->primary_list); 1351 compare_chr_send(s, 1352 pkt->data, 1353 pkt->size, 1354 pkt->vnet_hdr_len, 1355 false, 1356 true); 1357 packet_destroy_partial(pkt, NULL); 1358 } 1359 while (!g_queue_is_empty(&conn->secondary_list)) { 1360 pkt = g_queue_pop_head(&conn->secondary_list); 1361 packet_destroy(pkt, NULL); 1362 } 1363 } 1364 1365 static void colo_compare_class_init(ObjectClass *oc, void *data) 1366 { 1367 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1368 1369 ucc->complete = colo_compare_complete; 1370 } 1371 1372 static void colo_compare_init(Object *obj) 1373 { 1374 CompareState *s = COLO_COMPARE(obj); 1375 1376 object_property_add_str(obj, "primary_in", 1377 compare_get_pri_indev, compare_set_pri_indev); 1378 object_property_add_str(obj, "secondary_in", 1379 compare_get_sec_indev, compare_set_sec_indev); 1380 object_property_add_str(obj, "outdev", 1381 compare_get_outdev, compare_set_outdev); 1382 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1383 (Object **)&s->iothread, 1384 object_property_allow_set_link, 1385 OBJ_PROP_LINK_STRONG); 1386 /* This parameter just for Xen COLO */ 1387 object_property_add_str(obj, "notify_dev", 1388 compare_get_notify_dev, compare_set_notify_dev); 1389 1390 object_property_add(obj, "compare_timeout", "uint64", 1391 compare_get_timeout, 1392 compare_set_timeout, NULL, NULL); 1393 1394 object_property_add(obj, "expired_scan_cycle", "uint32", 1395 compare_get_expired_scan_cycle, 1396 compare_set_expired_scan_cycle, NULL, NULL); 1397 1398 object_property_add(obj, "max_queue_size", "uint32", 1399 get_max_queue_size, 1400 set_max_queue_size, NULL, NULL); 1401 1402 s->vnet_hdr = false; 1403 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1404 compare_set_vnet_hdr); 1405 } 1406 1407 void colo_compare_cleanup(void) 1408 { 1409 CompareState *tmp = NULL; 1410 CompareState *n = NULL; 1411 1412 QTAILQ_FOREACH_SAFE(tmp, &net_compares, next, n) { 1413 object_unparent(OBJECT(tmp)); 1414 } 1415 } 1416 1417 static void colo_compare_finalize(Object *obj) 1418 { 1419 CompareState *s = COLO_COMPARE(obj); 1420 CompareState *tmp = NULL; 1421 1422 qemu_mutex_lock(&colo_compare_mutex); 1423 QTAILQ_FOREACH(tmp, &net_compares, next) { 1424 if (tmp == s) { 1425 QTAILQ_REMOVE(&net_compares, s, next); 1426 break; 1427 } 1428 } 1429 if (QTAILQ_EMPTY(&net_compares)) { 1430 colo_compare_active = false; 1431 qemu_mutex_destroy(&event_mtx); 1432 qemu_cond_destroy(&event_complete_cond); 1433 } 1434 qemu_mutex_unlock(&colo_compare_mutex); 1435 1436 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1437 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1438 qemu_chr_fe_deinit(&s->chr_out, false); 1439 if (s->notify_dev) { 1440 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1441 } 1442 1443 colo_compare_timer_del(s); 1444 1445 qemu_bh_delete(s->event_bh); 1446 1447 AioContext *ctx = iothread_get_aio_context(s->iothread); 1448 aio_context_acquire(ctx); 1449 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1450 if (s->notify_dev) { 1451 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1452 } 1453 aio_context_release(ctx); 1454 1455 /* Release all unhandled packets after compare thead exited */ 1456 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1457 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1458 1459 g_queue_clear(&s->conn_list); 1460 g_queue_clear(&s->out_sendco.send_list); 1461 if (s->notify_dev) { 1462 g_queue_clear(&s->notify_sendco.send_list); 1463 } 1464 1465 if (s->connection_track_table) { 1466 g_hash_table_destroy(s->connection_track_table); 1467 } 1468 1469 object_unref(OBJECT(s->iothread)); 1470 1471 g_free(s->pri_indev); 1472 g_free(s->sec_indev); 1473 g_free(s->outdev); 1474 g_free(s->notify_dev); 1475 } 1476 1477 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1478 { 1479 colo_compare_active = false; 1480 qemu_mutex_init(&colo_compare_mutex); 1481 } 1482 1483 static const TypeInfo colo_compare_info = { 1484 .name = TYPE_COLO_COMPARE, 1485 .parent = TYPE_OBJECT, 1486 .instance_size = sizeof(CompareState), 1487 .instance_init = colo_compare_init, 1488 .instance_finalize = colo_compare_finalize, 1489 .class_size = sizeof(CompareClass), 1490 .class_init = colo_compare_class_init, 1491 .interfaces = (InterfaceInfo[]) { 1492 { TYPE_USER_CREATABLE }, 1493 { } 1494 } 1495 }; 1496 1497 static void register_types(void) 1498 { 1499 type_register_static(&colo_compare_info); 1500 } 1501 1502 type_init(register_types); 1503