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 3000 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 uint32_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, strlen(str)); 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 *max_ack = *max_ack > pkt->tcp_ack ? *max_ack : pkt->tcp_ack; 213 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 214 + (tcphd->th_off << 2) - pkt->vnet_hdr_len; 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); 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 ? conn->sack : conn->pack; 417 418 pri: 419 if (g_queue_is_empty(&conn->primary_list)) { 420 return; 421 } 422 ppkt = g_queue_pop_head(&conn->primary_list); 423 sec: 424 if (g_queue_is_empty(&conn->secondary_list)) { 425 g_queue_push_head(&conn->primary_list, ppkt); 426 return; 427 } 428 spkt = g_queue_pop_head(&conn->secondary_list); 429 430 if (ppkt->tcp_seq == ppkt->seq_end) { 431 colo_release_primary_pkt(s, ppkt); 432 ppkt = NULL; 433 } 434 435 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 436 trace_colo_compare_main("pri: this packet has compared"); 437 colo_release_primary_pkt(s, ppkt); 438 ppkt = NULL; 439 } 440 441 if (spkt->tcp_seq == spkt->seq_end) { 442 packet_destroy(spkt, NULL); 443 if (!ppkt) { 444 goto pri; 445 } else { 446 goto sec; 447 } 448 } else { 449 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 450 trace_colo_compare_main("sec: this packet has compared"); 451 packet_destroy(spkt, NULL); 452 if (!ppkt) { 453 goto pri; 454 } else { 455 goto sec; 456 } 457 } 458 if (!ppkt) { 459 g_queue_push_head(&conn->secondary_list, spkt); 460 goto pri; 461 } 462 } 463 464 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 465 trace_colo_compare_tcp_info("pri", 466 ppkt->tcp_seq, ppkt->tcp_ack, 467 ppkt->header_size, ppkt->payload_size, 468 ppkt->offset, ppkt->flags); 469 470 trace_colo_compare_tcp_info("sec", 471 spkt->tcp_seq, spkt->tcp_ack, 472 spkt->header_size, spkt->payload_size, 473 spkt->offset, spkt->flags); 474 475 if (mark == COLO_COMPARE_FREE_PRIMARY) { 476 conn->compare_seq = ppkt->seq_end; 477 colo_release_primary_pkt(s, ppkt); 478 g_queue_push_head(&conn->secondary_list, spkt); 479 goto pri; 480 } 481 if (mark == COLO_COMPARE_FREE_SECONDARY) { 482 conn->compare_seq = spkt->seq_end; 483 packet_destroy(spkt, NULL); 484 goto sec; 485 } 486 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 (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 596 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 597 598 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 599 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 600 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 601 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 602 603 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 604 pri_ip_dst, spkt->size, 605 sec_ip_src, sec_ip_dst); 606 } 607 608 if (ppkt->size != spkt->size) { 609 trace_colo_compare_main("Other: payload size of packets are different"); 610 return -1; 611 } 612 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 613 ppkt->size - offset); 614 } 615 616 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 617 { 618 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 619 620 if ((now - pkt->creation_ms) > (*check_time)) { 621 trace_colo_old_packet_check_found(pkt->creation_ms); 622 return 0; 623 } else { 624 return 1; 625 } 626 } 627 628 void colo_compare_register_notifier(Notifier *notify) 629 { 630 notifier_list_add(&colo_compare_notifiers, notify); 631 } 632 633 void colo_compare_unregister_notifier(Notifier *notify) 634 { 635 notifier_remove(notify); 636 } 637 638 static int colo_old_packet_check_one_conn(Connection *conn, 639 CompareState *s) 640 { 641 GList *result = NULL; 642 643 result = g_queue_find_custom(&conn->primary_list, 644 &s->compare_timeout, 645 (GCompareFunc)colo_old_packet_check_one); 646 647 if (result) { 648 /* Do checkpoint will flush old packet */ 649 colo_compare_inconsistency_notify(s); 650 return 0; 651 } 652 653 return 1; 654 } 655 656 /* 657 * Look for old packets that the secondary hasn't matched, 658 * if we have some then we have to checkpoint to wake 659 * the secondary up. 660 */ 661 static void colo_old_packet_check(void *opaque) 662 { 663 CompareState *s = opaque; 664 665 /* 666 * If we find one old packet, stop finding job and notify 667 * COLO frame do checkpoint. 668 */ 669 g_queue_find_custom(&s->conn_list, s, 670 (GCompareFunc)colo_old_packet_check_one_conn); 671 } 672 673 static void colo_compare_packet(CompareState *s, Connection *conn, 674 int (*HandlePacket)(Packet *spkt, 675 Packet *ppkt)) 676 { 677 Packet *pkt = NULL; 678 GList *result = NULL; 679 680 while (!g_queue_is_empty(&conn->primary_list) && 681 !g_queue_is_empty(&conn->secondary_list)) { 682 pkt = g_queue_pop_head(&conn->primary_list); 683 result = g_queue_find_custom(&conn->secondary_list, 684 pkt, (GCompareFunc)HandlePacket); 685 686 if (result) { 687 colo_release_primary_pkt(s, pkt); 688 g_queue_remove(&conn->secondary_list, result->data); 689 } else { 690 /* 691 * If one packet arrive late, the secondary_list or 692 * primary_list will be empty, so we can't compare it 693 * until next comparison. If the packets in the list are 694 * timeout, it will trigger a checkpoint request. 695 */ 696 trace_colo_compare_main("packet different"); 697 g_queue_push_head(&conn->primary_list, pkt); 698 699 colo_compare_inconsistency_notify(s); 700 break; 701 } 702 } 703 } 704 705 /* 706 * Called from the compare thread on the primary 707 * for compare packet with secondary list of the 708 * specified connection when a new packet was 709 * queued to it. 710 */ 711 static void colo_compare_connection(void *opaque, void *user_data) 712 { 713 CompareState *s = user_data; 714 Connection *conn = opaque; 715 716 switch (conn->ip_proto) { 717 case IPPROTO_TCP: 718 colo_compare_tcp(s, conn); 719 break; 720 case IPPROTO_UDP: 721 colo_compare_packet(s, conn, colo_packet_compare_udp); 722 break; 723 case IPPROTO_ICMP: 724 colo_compare_packet(s, conn, colo_packet_compare_icmp); 725 break; 726 default: 727 colo_compare_packet(s, conn, colo_packet_compare_other); 728 break; 729 } 730 } 731 732 static void coroutine_fn _compare_chr_send(void *opaque) 733 { 734 SendCo *sendco = opaque; 735 CompareState *s = sendco->s; 736 int ret = 0; 737 738 while (!g_queue_is_empty(&sendco->send_list)) { 739 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 740 uint32_t len = htonl(entry->size); 741 742 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 743 744 if (ret != sizeof(len)) { 745 g_free(entry->buf); 746 g_slice_free(SendEntry, entry); 747 goto err; 748 } 749 750 if (!sendco->notify_remote_frame && s->vnet_hdr) { 751 /* 752 * We send vnet header len make other module(like filter-redirector) 753 * know how to parse net packet correctly. 754 */ 755 len = htonl(entry->vnet_hdr_len); 756 757 ret = qemu_chr_fe_write_all(sendco->chr, 758 (uint8_t *)&len, 759 sizeof(len)); 760 761 if (ret != sizeof(len)) { 762 g_free(entry->buf); 763 g_slice_free(SendEntry, entry); 764 goto err; 765 } 766 } 767 768 ret = qemu_chr_fe_write_all(sendco->chr, 769 (uint8_t *)entry->buf, 770 entry->size); 771 772 if (ret != entry->size) { 773 g_free(entry->buf); 774 g_slice_free(SendEntry, entry); 775 goto err; 776 } 777 778 g_free(entry->buf); 779 g_slice_free(SendEntry, entry); 780 } 781 782 sendco->ret = 0; 783 goto out; 784 785 err: 786 while (!g_queue_is_empty(&sendco->send_list)) { 787 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 788 g_free(entry->buf); 789 g_slice_free(SendEntry, entry); 790 } 791 sendco->ret = ret < 0 ? ret : -EIO; 792 out: 793 sendco->co = NULL; 794 sendco->done = true; 795 aio_wait_kick(); 796 } 797 798 static int compare_chr_send(CompareState *s, 799 uint8_t *buf, 800 uint32_t size, 801 uint32_t vnet_hdr_len, 802 bool notify_remote_frame, 803 bool zero_copy) 804 { 805 SendCo *sendco; 806 SendEntry *entry; 807 808 if (notify_remote_frame) { 809 sendco = &s->notify_sendco; 810 } else { 811 sendco = &s->out_sendco; 812 } 813 814 if (!size) { 815 return 0; 816 } 817 818 entry = g_slice_new(SendEntry); 819 entry->size = size; 820 entry->vnet_hdr_len = vnet_hdr_len; 821 if (zero_copy) { 822 entry->buf = buf; 823 } else { 824 entry->buf = g_malloc(size); 825 memcpy(entry->buf, buf, size); 826 } 827 g_queue_push_head(&sendco->send_list, entry); 828 829 if (sendco->done) { 830 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 831 sendco->done = false; 832 qemu_coroutine_enter(sendco->co); 833 if (sendco->done) { 834 /* report early errors */ 835 return sendco->ret; 836 } 837 } 838 839 /* assume success */ 840 return 0; 841 } 842 843 static int compare_chr_can_read(void *opaque) 844 { 845 return COMPARE_READ_LEN_MAX; 846 } 847 848 /* 849 * Called from the main thread on the primary for packets 850 * arriving over the socket from the primary. 851 */ 852 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 853 { 854 CompareState *s = COLO_COMPARE(opaque); 855 int ret; 856 857 ret = net_fill_rstate(&s->pri_rs, buf, size); 858 if (ret == -1) { 859 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 860 NULL, NULL, true); 861 error_report("colo-compare primary_in error"); 862 } 863 } 864 865 /* 866 * Called from the main thread on the primary for packets 867 * arriving over the socket from the secondary. 868 */ 869 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 870 { 871 CompareState *s = COLO_COMPARE(opaque); 872 int ret; 873 874 ret = net_fill_rstate(&s->sec_rs, buf, size); 875 if (ret == -1) { 876 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 877 NULL, NULL, true); 878 error_report("colo-compare secondary_in error"); 879 } 880 } 881 882 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 883 { 884 CompareState *s = COLO_COMPARE(opaque); 885 int ret; 886 887 ret = net_fill_rstate(&s->notify_rs, buf, size); 888 if (ret == -1) { 889 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 890 NULL, NULL, true); 891 error_report("colo-compare notify_dev error"); 892 } 893 } 894 895 /* 896 * Check old packet regularly so it can watch for any packets 897 * that the secondary hasn't produced equivalents of. 898 */ 899 static void check_old_packet_regular(void *opaque) 900 { 901 CompareState *s = opaque; 902 903 /* if have old packet we will notify checkpoint */ 904 colo_old_packet_check(s); 905 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 906 s->expired_scan_cycle); 907 } 908 909 /* Public API, Used for COLO frame to notify compare event */ 910 void colo_notify_compares_event(void *opaque, int event, Error **errp) 911 { 912 CompareState *s; 913 qemu_mutex_lock(&colo_compare_mutex); 914 915 if (!colo_compare_active) { 916 qemu_mutex_unlock(&colo_compare_mutex); 917 return; 918 } 919 920 qemu_mutex_lock(&event_mtx); 921 QTAILQ_FOREACH(s, &net_compares, next) { 922 s->event = event; 923 qemu_bh_schedule(s->event_bh); 924 event_unhandled_count++; 925 } 926 /* Wait all compare threads to finish handling this event */ 927 while (event_unhandled_count > 0) { 928 qemu_cond_wait(&event_complete_cond, &event_mtx); 929 } 930 931 qemu_mutex_unlock(&event_mtx); 932 qemu_mutex_unlock(&colo_compare_mutex); 933 } 934 935 static void colo_compare_timer_init(CompareState *s) 936 { 937 AioContext *ctx = iothread_get_aio_context(s->iothread); 938 939 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, 940 SCALE_MS, check_old_packet_regular, 941 s); 942 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 943 s->expired_scan_cycle); 944 } 945 946 static void colo_compare_timer_del(CompareState *s) 947 { 948 if (s->packet_check_timer) { 949 timer_del(s->packet_check_timer); 950 timer_free(s->packet_check_timer); 951 s->packet_check_timer = NULL; 952 } 953 } 954 955 static void colo_flush_packets(void *opaque, void *user_data); 956 957 static void colo_compare_handle_event(void *opaque) 958 { 959 CompareState *s = opaque; 960 961 switch (s->event) { 962 case COLO_EVENT_CHECKPOINT: 963 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 964 break; 965 case COLO_EVENT_FAILOVER: 966 break; 967 default: 968 break; 969 } 970 971 qemu_mutex_lock(&event_mtx); 972 assert(event_unhandled_count > 0); 973 event_unhandled_count--; 974 qemu_cond_broadcast(&event_complete_cond); 975 qemu_mutex_unlock(&event_mtx); 976 } 977 978 static void colo_compare_iothread(CompareState *s) 979 { 980 AioContext *ctx = iothread_get_aio_context(s->iothread); 981 object_ref(OBJECT(s->iothread)); 982 s->worker_context = iothread_get_g_main_context(s->iothread); 983 984 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 985 compare_pri_chr_in, NULL, NULL, 986 s, s->worker_context, true); 987 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 988 compare_sec_chr_in, NULL, NULL, 989 s, s->worker_context, true); 990 if (s->notify_dev) { 991 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 992 compare_notify_chr, NULL, NULL, 993 s, s->worker_context, true); 994 } 995 996 colo_compare_timer_init(s); 997 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 998 } 999 1000 static char *compare_get_pri_indev(Object *obj, Error **errp) 1001 { 1002 CompareState *s = COLO_COMPARE(obj); 1003 1004 return g_strdup(s->pri_indev); 1005 } 1006 1007 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1008 { 1009 CompareState *s = COLO_COMPARE(obj); 1010 1011 g_free(s->pri_indev); 1012 s->pri_indev = g_strdup(value); 1013 } 1014 1015 static char *compare_get_sec_indev(Object *obj, Error **errp) 1016 { 1017 CompareState *s = COLO_COMPARE(obj); 1018 1019 return g_strdup(s->sec_indev); 1020 } 1021 1022 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1023 { 1024 CompareState *s = COLO_COMPARE(obj); 1025 1026 g_free(s->sec_indev); 1027 s->sec_indev = g_strdup(value); 1028 } 1029 1030 static char *compare_get_outdev(Object *obj, Error **errp) 1031 { 1032 CompareState *s = COLO_COMPARE(obj); 1033 1034 return g_strdup(s->outdev); 1035 } 1036 1037 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1038 { 1039 CompareState *s = COLO_COMPARE(obj); 1040 1041 g_free(s->outdev); 1042 s->outdev = g_strdup(value); 1043 } 1044 1045 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1046 { 1047 CompareState *s = COLO_COMPARE(obj); 1048 1049 return s->vnet_hdr; 1050 } 1051 1052 static void compare_set_vnet_hdr(Object *obj, 1053 bool value, 1054 Error **errp) 1055 { 1056 CompareState *s = COLO_COMPARE(obj); 1057 1058 s->vnet_hdr = value; 1059 } 1060 1061 static char *compare_get_notify_dev(Object *obj, Error **errp) 1062 { 1063 CompareState *s = COLO_COMPARE(obj); 1064 1065 return g_strdup(s->notify_dev); 1066 } 1067 1068 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1069 { 1070 CompareState *s = COLO_COMPARE(obj); 1071 1072 g_free(s->notify_dev); 1073 s->notify_dev = g_strdup(value); 1074 } 1075 1076 static void compare_get_timeout(Object *obj, Visitor *v, 1077 const char *name, void *opaque, 1078 Error **errp) 1079 { 1080 CompareState *s = COLO_COMPARE(obj); 1081 uint32_t value = s->compare_timeout; 1082 1083 visit_type_uint32(v, name, &value, errp); 1084 } 1085 1086 static void compare_set_timeout(Object *obj, Visitor *v, 1087 const char *name, void *opaque, 1088 Error **errp) 1089 { 1090 CompareState *s = COLO_COMPARE(obj); 1091 uint32_t value; 1092 1093 if (!visit_type_uint32(v, name, &value, errp)) { 1094 return; 1095 } 1096 if (!value) { 1097 error_setg(errp, "Property '%s.%s' requires a positive value", 1098 object_get_typename(obj), name); 1099 return; 1100 } 1101 s->compare_timeout = value; 1102 } 1103 1104 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1105 const char *name, void *opaque, 1106 Error **errp) 1107 { 1108 CompareState *s = COLO_COMPARE(obj); 1109 uint32_t value = s->expired_scan_cycle; 1110 1111 visit_type_uint32(v, name, &value, errp); 1112 } 1113 1114 static void compare_set_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; 1120 1121 if (!visit_type_uint32(v, name, &value, errp)) { 1122 return; 1123 } 1124 if (!value) { 1125 error_setg(errp, "Property '%s.%s' requires a positive value", 1126 object_get_typename(obj), name); 1127 return; 1128 } 1129 s->expired_scan_cycle = value; 1130 } 1131 1132 static void get_max_queue_size(Object *obj, Visitor *v, 1133 const char *name, void *opaque, 1134 Error **errp) 1135 { 1136 uint32_t value = max_queue_size; 1137 1138 visit_type_uint32(v, name, &value, errp); 1139 } 1140 1141 static void set_max_queue_size(Object *obj, Visitor *v, 1142 const char *name, void *opaque, 1143 Error **errp) 1144 { 1145 Error *local_err = NULL; 1146 uint32_t value; 1147 1148 visit_type_uint32(v, name, &value, &local_err); 1149 if (local_err) { 1150 goto out; 1151 } 1152 if (!value) { 1153 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1154 object_get_typename(obj), name); 1155 goto out; 1156 } 1157 max_queue_size = value; 1158 1159 out: 1160 error_propagate(errp, local_err); 1161 } 1162 1163 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1164 { 1165 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1166 Connection *conn = NULL; 1167 1168 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1169 trace_colo_compare_main("primary: unsupported packet in"); 1170 compare_chr_send(s, 1171 pri_rs->buf, 1172 pri_rs->packet_len, 1173 pri_rs->vnet_hdr_len, 1174 false, 1175 false); 1176 } else { 1177 /* compare packet in the specified connection */ 1178 colo_compare_connection(conn, s); 1179 } 1180 } 1181 1182 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1183 { 1184 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1185 Connection *conn = NULL; 1186 1187 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1188 trace_colo_compare_main("secondary: unsupported packet in"); 1189 } else { 1190 /* compare packet in the specified connection */ 1191 colo_compare_connection(conn, s); 1192 } 1193 } 1194 1195 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1196 { 1197 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1198 1199 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1200 int ret; 1201 1202 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1203 notify_rs->buf, 1204 notify_rs->packet_len)) { 1205 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1206 if (ret < 0) { 1207 error_report("Notify Xen COLO-frame INIT failed"); 1208 } 1209 } else if (packet_matches_str("COLO_CHECKPOINT", 1210 notify_rs->buf, 1211 notify_rs->packet_len)) { 1212 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1213 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1214 } else { 1215 error_report("COLO compare got unsupported instruction"); 1216 } 1217 } 1218 1219 /* 1220 * Return 0 is success. 1221 * Return 1 is failed. 1222 */ 1223 static int find_and_check_chardev(Chardev **chr, 1224 char *chr_name, 1225 Error **errp) 1226 { 1227 *chr = qemu_chr_find(chr_name); 1228 if (*chr == NULL) { 1229 error_setg(errp, "Device '%s' not found", 1230 chr_name); 1231 return 1; 1232 } 1233 1234 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1235 error_setg(errp, "chardev \"%s\" is not reconnectable", 1236 chr_name); 1237 return 1; 1238 } 1239 1240 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1241 error_setg(errp, "chardev \"%s\" cannot switch context", 1242 chr_name); 1243 return 1; 1244 } 1245 1246 return 0; 1247 } 1248 1249 /* 1250 * Called from the main thread on the primary 1251 * to setup colo-compare. 1252 */ 1253 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1254 { 1255 CompareState *s = COLO_COMPARE(uc); 1256 Chardev *chr; 1257 1258 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1259 error_setg(errp, "colo compare needs 'primary_in' ," 1260 "'secondary_in','outdev','iothread' property set"); 1261 return; 1262 } else if (!strcmp(s->pri_indev, s->outdev) || 1263 !strcmp(s->sec_indev, s->outdev) || 1264 !strcmp(s->pri_indev, s->sec_indev)) { 1265 error_setg(errp, "'indev' and 'outdev' could not be same " 1266 "for compare module"); 1267 return; 1268 } 1269 1270 if (!s->compare_timeout) { 1271 /* Set default value to 3000 MS */ 1272 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1273 } 1274 1275 if (!s->expired_scan_cycle) { 1276 /* Set default value to 3000 MS */ 1277 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1278 } 1279 1280 if (!max_queue_size) { 1281 /* Set default queue size to 1024 */ 1282 max_queue_size = MAX_QUEUE_SIZE; 1283 } 1284 1285 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1286 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1287 return; 1288 } 1289 1290 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1291 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1292 return; 1293 } 1294 1295 if (find_and_check_chardev(&chr, s->outdev, errp) || 1296 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1297 return; 1298 } 1299 1300 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1301 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1302 1303 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1304 if (s->notify_dev) { 1305 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1306 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1307 return; 1308 } 1309 1310 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1311 s->vnet_hdr); 1312 } 1313 1314 s->out_sendco.s = s; 1315 s->out_sendco.chr = &s->chr_out; 1316 s->out_sendco.notify_remote_frame = false; 1317 s->out_sendco.done = true; 1318 g_queue_init(&s->out_sendco.send_list); 1319 1320 if (s->notify_dev) { 1321 s->notify_sendco.s = s; 1322 s->notify_sendco.chr = &s->chr_notify_dev; 1323 s->notify_sendco.notify_remote_frame = true; 1324 s->notify_sendco.done = true; 1325 g_queue_init(&s->notify_sendco.send_list); 1326 } 1327 1328 g_queue_init(&s->conn_list); 1329 1330 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1331 connection_key_equal, 1332 g_free, 1333 connection_destroy); 1334 1335 colo_compare_iothread(s); 1336 1337 qemu_mutex_lock(&colo_compare_mutex); 1338 if (!colo_compare_active) { 1339 qemu_mutex_init(&event_mtx); 1340 qemu_cond_init(&event_complete_cond); 1341 colo_compare_active = true; 1342 } 1343 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1344 qemu_mutex_unlock(&colo_compare_mutex); 1345 1346 return; 1347 } 1348 1349 static void colo_flush_packets(void *opaque, void *user_data) 1350 { 1351 CompareState *s = user_data; 1352 Connection *conn = opaque; 1353 Packet *pkt = NULL; 1354 1355 while (!g_queue_is_empty(&conn->primary_list)) { 1356 pkt = g_queue_pop_head(&conn->primary_list); 1357 compare_chr_send(s, 1358 pkt->data, 1359 pkt->size, 1360 pkt->vnet_hdr_len, 1361 false, 1362 true); 1363 packet_destroy_partial(pkt, NULL); 1364 } 1365 while (!g_queue_is_empty(&conn->secondary_list)) { 1366 pkt = g_queue_pop_head(&conn->secondary_list); 1367 packet_destroy(pkt, NULL); 1368 } 1369 } 1370 1371 static void colo_compare_class_init(ObjectClass *oc, void *data) 1372 { 1373 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1374 1375 ucc->complete = colo_compare_complete; 1376 } 1377 1378 static void colo_compare_init(Object *obj) 1379 { 1380 CompareState *s = COLO_COMPARE(obj); 1381 1382 object_property_add_str(obj, "primary_in", 1383 compare_get_pri_indev, compare_set_pri_indev); 1384 object_property_add_str(obj, "secondary_in", 1385 compare_get_sec_indev, compare_set_sec_indev); 1386 object_property_add_str(obj, "outdev", 1387 compare_get_outdev, compare_set_outdev); 1388 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1389 (Object **)&s->iothread, 1390 object_property_allow_set_link, 1391 OBJ_PROP_LINK_STRONG); 1392 /* This parameter just for Xen COLO */ 1393 object_property_add_str(obj, "notify_dev", 1394 compare_get_notify_dev, compare_set_notify_dev); 1395 1396 object_property_add(obj, "compare_timeout", "uint32", 1397 compare_get_timeout, 1398 compare_set_timeout, NULL, NULL); 1399 1400 object_property_add(obj, "expired_scan_cycle", "uint32", 1401 compare_get_expired_scan_cycle, 1402 compare_set_expired_scan_cycle, NULL, NULL); 1403 1404 object_property_add(obj, "max_queue_size", "uint32", 1405 get_max_queue_size, 1406 set_max_queue_size, NULL, NULL); 1407 1408 s->vnet_hdr = false; 1409 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1410 compare_set_vnet_hdr); 1411 } 1412 1413 static void colo_compare_finalize(Object *obj) 1414 { 1415 CompareState *s = COLO_COMPARE(obj); 1416 CompareState *tmp = NULL; 1417 1418 qemu_mutex_lock(&colo_compare_mutex); 1419 QTAILQ_FOREACH(tmp, &net_compares, next) { 1420 if (tmp == s) { 1421 QTAILQ_REMOVE(&net_compares, s, next); 1422 break; 1423 } 1424 } 1425 if (QTAILQ_EMPTY(&net_compares)) { 1426 colo_compare_active = false; 1427 qemu_mutex_destroy(&event_mtx); 1428 qemu_cond_destroy(&event_complete_cond); 1429 } 1430 qemu_mutex_unlock(&colo_compare_mutex); 1431 1432 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1433 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1434 qemu_chr_fe_deinit(&s->chr_out, false); 1435 if (s->notify_dev) { 1436 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1437 } 1438 1439 colo_compare_timer_del(s); 1440 1441 qemu_bh_delete(s->event_bh); 1442 1443 AioContext *ctx = iothread_get_aio_context(s->iothread); 1444 aio_context_acquire(ctx); 1445 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1446 if (s->notify_dev) { 1447 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1448 } 1449 aio_context_release(ctx); 1450 1451 /* Release all unhandled packets after compare thead exited */ 1452 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1453 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1454 1455 g_queue_clear(&s->conn_list); 1456 g_queue_clear(&s->out_sendco.send_list); 1457 if (s->notify_dev) { 1458 g_queue_clear(&s->notify_sendco.send_list); 1459 } 1460 1461 if (s->connection_track_table) { 1462 g_hash_table_destroy(s->connection_track_table); 1463 } 1464 1465 object_unref(OBJECT(s->iothread)); 1466 1467 g_free(s->pri_indev); 1468 g_free(s->sec_indev); 1469 g_free(s->outdev); 1470 g_free(s->notify_dev); 1471 } 1472 1473 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1474 { 1475 colo_compare_active = false; 1476 qemu_mutex_init(&colo_compare_mutex); 1477 } 1478 1479 static const TypeInfo colo_compare_info = { 1480 .name = TYPE_COLO_COMPARE, 1481 .parent = TYPE_OBJECT, 1482 .instance_size = sizeof(CompareState), 1483 .instance_init = colo_compare_init, 1484 .instance_finalize = colo_compare_finalize, 1485 .class_size = sizeof(CompareClass), 1486 .class_init = colo_compare_class_init, 1487 .interfaces = (InterfaceInfo[]) { 1488 { TYPE_USER_CREATABLE }, 1489 { } 1490 } 1491 }; 1492 1493 static void register_types(void) 1494 { 1495 type_register_static(&colo_compare_info); 1496 } 1497 1498 type_init(register_types); 1499