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, 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); 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 } else if (mark == COLO_COMPARE_FREE_SECONDARY) { 481 conn->compare_seq = spkt->seq_end; 482 packet_destroy(spkt, NULL); 483 goto sec; 484 } else if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 485 conn->compare_seq = ppkt->seq_end; 486 colo_release_primary_pkt(s, ppkt); 487 packet_destroy(spkt, NULL); 488 goto pri; 489 } 490 } else { 491 g_queue_push_head(&conn->primary_list, ppkt); 492 g_queue_push_head(&conn->secondary_list, spkt); 493 494 #ifdef DEBUG_COLO_PACKETS 495 qemu_hexdump(stderr, "colo-compare ppkt", ppkt->data, ppkt->size); 496 qemu_hexdump(stderr, "colo-compare spkt", spkt->data, spkt->size); 497 #endif 498 499 colo_compare_inconsistency_notify(s); 500 } 501 } 502 503 504 /* 505 * Called from the compare thread on the primary 506 * for compare udp packet 507 */ 508 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 509 { 510 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 511 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 512 513 trace_colo_compare_main("compare udp"); 514 515 /* 516 * Because of ppkt and spkt are both in the same connection, 517 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 518 * same with spkt. In addition, IP header's Identification is a random 519 * field, we can handle it in IP fragmentation function later. 520 * COLO just concern the response net packet payload from primary guest 521 * and secondary guest are same or not, So we ignored all IP header include 522 * other field like TOS,TTL,IP Checksum. we only need to compare 523 * the ip payload here. 524 */ 525 if (ppkt->size != spkt->size) { 526 trace_colo_compare_main("UDP: payload size of packets are different"); 527 return -1; 528 } 529 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 530 ppkt->size - offset)) { 531 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 532 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 533 #ifdef DEBUG_COLO_PACKETS 534 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 535 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 536 #endif 537 return -1; 538 } else { 539 return 0; 540 } 541 } 542 543 /* 544 * Called from the compare thread on the primary 545 * for compare icmp packet 546 */ 547 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 548 { 549 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 550 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 551 552 trace_colo_compare_main("compare icmp"); 553 554 /* 555 * Because of ppkt and spkt are both in the same connection, 556 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 557 * same with spkt. In addition, IP header's Identification is a random 558 * field, we can handle it in IP fragmentation function later. 559 * COLO just concern the response net packet payload from primary guest 560 * and secondary guest are same or not, So we ignored all IP header include 561 * other field like TOS,TTL,IP Checksum. we only need to compare 562 * the ip payload here. 563 */ 564 if (ppkt->size != spkt->size) { 565 trace_colo_compare_main("ICMP: payload size of packets are different"); 566 return -1; 567 } 568 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 569 ppkt->size - offset)) { 570 trace_colo_compare_icmp_miscompare("primary pkt size", 571 ppkt->size); 572 trace_colo_compare_icmp_miscompare("Secondary pkt size", 573 spkt->size); 574 #ifdef DEBUG_COLO_PACKETS 575 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 576 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 577 #endif 578 return -1; 579 } else { 580 return 0; 581 } 582 } 583 584 /* 585 * Called from the compare thread on the primary 586 * for compare other packet 587 */ 588 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 589 { 590 uint16_t offset = ppkt->vnet_hdr_len; 591 592 trace_colo_compare_main("compare other"); 593 if (ppkt->size != spkt->size) { 594 trace_colo_compare_main("Other: payload size of packets are different"); 595 return -1; 596 } 597 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 598 ppkt->size - offset); 599 } 600 601 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 602 { 603 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 604 605 if ((now - pkt->creation_ms) > (*check_time)) { 606 trace_colo_old_packet_check_found(pkt->creation_ms); 607 return 0; 608 } else { 609 return 1; 610 } 611 } 612 613 void colo_compare_register_notifier(Notifier *notify) 614 { 615 notifier_list_add(&colo_compare_notifiers, notify); 616 } 617 618 void colo_compare_unregister_notifier(Notifier *notify) 619 { 620 notifier_remove(notify); 621 } 622 623 static int colo_old_packet_check_one_conn(Connection *conn, 624 CompareState *s) 625 { 626 if (!g_queue_is_empty(&conn->primary_list)) { 627 if (g_queue_find_custom(&conn->primary_list, 628 &s->compare_timeout, 629 (GCompareFunc)colo_old_packet_check_one)) 630 goto out; 631 } 632 633 if (!g_queue_is_empty(&conn->secondary_list)) { 634 if (g_queue_find_custom(&conn->secondary_list, 635 &s->compare_timeout, 636 (GCompareFunc)colo_old_packet_check_one)) 637 goto out; 638 } 639 640 return 1; 641 642 out: 643 /* Do checkpoint will flush old packet */ 644 colo_compare_inconsistency_notify(s); 645 return 0; 646 } 647 648 /* 649 * Look for old packets that the secondary hasn't matched, 650 * if we have some then we have to checkpoint to wake 651 * the secondary up. 652 */ 653 static void colo_old_packet_check(void *opaque) 654 { 655 CompareState *s = opaque; 656 657 /* 658 * If we find one old packet, stop finding job and notify 659 * COLO frame do checkpoint. 660 */ 661 g_queue_find_custom(&s->conn_list, s, 662 (GCompareFunc)colo_old_packet_check_one_conn); 663 } 664 665 static void colo_compare_packet(CompareState *s, Connection *conn, 666 int (*HandlePacket)(Packet *spkt, 667 Packet *ppkt)) 668 { 669 Packet *pkt = NULL; 670 GList *result = NULL; 671 672 while (!g_queue_is_empty(&conn->primary_list) && 673 !g_queue_is_empty(&conn->secondary_list)) { 674 pkt = g_queue_pop_head(&conn->primary_list); 675 result = g_queue_find_custom(&conn->secondary_list, 676 pkt, (GCompareFunc)HandlePacket); 677 678 if (result) { 679 colo_release_primary_pkt(s, pkt); 680 packet_destroy(result->data, NULL); 681 g_queue_delete_link(&conn->secondary_list, result); 682 } else { 683 /* 684 * If one packet arrive late, the secondary_list or 685 * primary_list will be empty, so we can't compare it 686 * until next comparison. If the packets in the list are 687 * timeout, it will trigger a checkpoint request. 688 */ 689 trace_colo_compare_main("packet different"); 690 g_queue_push_head(&conn->primary_list, pkt); 691 692 colo_compare_inconsistency_notify(s); 693 break; 694 } 695 } 696 } 697 698 /* 699 * Called from the compare thread on the primary 700 * for compare packet with secondary list of the 701 * specified connection when a new packet was 702 * queued to it. 703 */ 704 static void colo_compare_connection(void *opaque, void *user_data) 705 { 706 CompareState *s = user_data; 707 Connection *conn = opaque; 708 709 switch (conn->ip_proto) { 710 case IPPROTO_TCP: 711 colo_compare_tcp(s, conn); 712 break; 713 case IPPROTO_UDP: 714 colo_compare_packet(s, conn, colo_packet_compare_udp); 715 break; 716 case IPPROTO_ICMP: 717 colo_compare_packet(s, conn, colo_packet_compare_icmp); 718 break; 719 default: 720 colo_compare_packet(s, conn, colo_packet_compare_other); 721 break; 722 } 723 } 724 725 static void coroutine_fn _compare_chr_send(void *opaque) 726 { 727 SendCo *sendco = opaque; 728 CompareState *s = sendco->s; 729 int ret = 0; 730 731 while (!g_queue_is_empty(&sendco->send_list)) { 732 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 733 uint32_t len = htonl(entry->size); 734 735 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 736 737 if (ret != sizeof(len)) { 738 g_free(entry->buf); 739 g_slice_free(SendEntry, entry); 740 goto err; 741 } 742 743 if (!sendco->notify_remote_frame && s->vnet_hdr) { 744 /* 745 * We send vnet header len make other module(like filter-redirector) 746 * know how to parse net packet correctly. 747 */ 748 len = htonl(entry->vnet_hdr_len); 749 750 ret = qemu_chr_fe_write_all(sendco->chr, 751 (uint8_t *)&len, 752 sizeof(len)); 753 754 if (ret != sizeof(len)) { 755 g_free(entry->buf); 756 g_slice_free(SendEntry, entry); 757 goto err; 758 } 759 } 760 761 ret = qemu_chr_fe_write_all(sendco->chr, 762 (uint8_t *)entry->buf, 763 entry->size); 764 765 if (ret != entry->size) { 766 g_free(entry->buf); 767 g_slice_free(SendEntry, entry); 768 goto err; 769 } 770 771 g_free(entry->buf); 772 g_slice_free(SendEntry, entry); 773 } 774 775 sendco->ret = 0; 776 goto out; 777 778 err: 779 while (!g_queue_is_empty(&sendco->send_list)) { 780 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 781 g_free(entry->buf); 782 g_slice_free(SendEntry, entry); 783 } 784 sendco->ret = ret < 0 ? ret : -EIO; 785 out: 786 sendco->co = NULL; 787 sendco->done = true; 788 aio_wait_kick(); 789 } 790 791 static int compare_chr_send(CompareState *s, 792 uint8_t *buf, 793 uint32_t size, 794 uint32_t vnet_hdr_len, 795 bool notify_remote_frame, 796 bool zero_copy) 797 { 798 SendCo *sendco; 799 SendEntry *entry; 800 801 if (notify_remote_frame) { 802 sendco = &s->notify_sendco; 803 } else { 804 sendco = &s->out_sendco; 805 } 806 807 if (!size) { 808 return 0; 809 } 810 811 entry = g_slice_new(SendEntry); 812 entry->size = size; 813 entry->vnet_hdr_len = vnet_hdr_len; 814 if (zero_copy) { 815 entry->buf = buf; 816 } else { 817 entry->buf = g_malloc(size); 818 memcpy(entry->buf, buf, size); 819 } 820 g_queue_push_head(&sendco->send_list, entry); 821 822 if (sendco->done) { 823 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 824 sendco->done = false; 825 qemu_coroutine_enter(sendco->co); 826 if (sendco->done) { 827 /* report early errors */ 828 return sendco->ret; 829 } 830 } 831 832 /* assume success */ 833 return 0; 834 } 835 836 static int compare_chr_can_read(void *opaque) 837 { 838 return COMPARE_READ_LEN_MAX; 839 } 840 841 /* 842 * Called from the main thread on the primary for packets 843 * arriving over the socket from the primary. 844 */ 845 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 846 { 847 CompareState *s = COLO_COMPARE(opaque); 848 int ret; 849 850 ret = net_fill_rstate(&s->pri_rs, buf, size); 851 if (ret == -1) { 852 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 853 NULL, NULL, true); 854 error_report("colo-compare primary_in error"); 855 } 856 } 857 858 /* 859 * Called from the main thread on the primary for packets 860 * arriving over the socket from the secondary. 861 */ 862 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 863 { 864 CompareState *s = COLO_COMPARE(opaque); 865 int ret; 866 867 ret = net_fill_rstate(&s->sec_rs, buf, size); 868 if (ret == -1) { 869 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 870 NULL, NULL, true); 871 error_report("colo-compare secondary_in error"); 872 } 873 } 874 875 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 876 { 877 CompareState *s = COLO_COMPARE(opaque); 878 int ret; 879 880 ret = net_fill_rstate(&s->notify_rs, buf, size); 881 if (ret == -1) { 882 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 883 NULL, NULL, true); 884 error_report("colo-compare notify_dev error"); 885 } 886 } 887 888 /* 889 * Check old packet regularly so it can watch for any packets 890 * that the secondary hasn't produced equivalents of. 891 */ 892 static void check_old_packet_regular(void *opaque) 893 { 894 CompareState *s = opaque; 895 896 /* if have old packet we will notify checkpoint */ 897 colo_old_packet_check(s); 898 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 899 s->expired_scan_cycle); 900 } 901 902 /* Public API, Used for COLO frame to notify compare event */ 903 void colo_notify_compares_event(void *opaque, int event, Error **errp) 904 { 905 CompareState *s; 906 qemu_mutex_lock(&colo_compare_mutex); 907 908 if (!colo_compare_active) { 909 qemu_mutex_unlock(&colo_compare_mutex); 910 return; 911 } 912 913 qemu_mutex_lock(&event_mtx); 914 QTAILQ_FOREACH(s, &net_compares, next) { 915 s->event = event; 916 qemu_bh_schedule(s->event_bh); 917 event_unhandled_count++; 918 } 919 /* Wait all compare threads to finish handling this event */ 920 while (event_unhandled_count > 0) { 921 qemu_cond_wait(&event_complete_cond, &event_mtx); 922 } 923 924 qemu_mutex_unlock(&event_mtx); 925 qemu_mutex_unlock(&colo_compare_mutex); 926 } 927 928 static void colo_compare_timer_init(CompareState *s) 929 { 930 AioContext *ctx = iothread_get_aio_context(s->iothread); 931 932 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_HOST, 933 SCALE_MS, check_old_packet_regular, 934 s); 935 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 936 s->expired_scan_cycle); 937 } 938 939 static void colo_compare_timer_del(CompareState *s) 940 { 941 if (s->packet_check_timer) { 942 timer_free(s->packet_check_timer); 943 s->packet_check_timer = NULL; 944 } 945 } 946 947 static void colo_flush_packets(void *opaque, void *user_data); 948 949 static void colo_compare_handle_event(void *opaque) 950 { 951 CompareState *s = opaque; 952 953 switch (s->event) { 954 case COLO_EVENT_CHECKPOINT: 955 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 956 break; 957 case COLO_EVENT_FAILOVER: 958 break; 959 default: 960 break; 961 } 962 963 qemu_mutex_lock(&event_mtx); 964 assert(event_unhandled_count > 0); 965 event_unhandled_count--; 966 qemu_cond_broadcast(&event_complete_cond); 967 qemu_mutex_unlock(&event_mtx); 968 } 969 970 static void colo_compare_iothread(CompareState *s) 971 { 972 AioContext *ctx = iothread_get_aio_context(s->iothread); 973 object_ref(OBJECT(s->iothread)); 974 s->worker_context = iothread_get_g_main_context(s->iothread); 975 976 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 977 compare_pri_chr_in, NULL, NULL, 978 s, s->worker_context, true); 979 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 980 compare_sec_chr_in, NULL, NULL, 981 s, s->worker_context, true); 982 if (s->notify_dev) { 983 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 984 compare_notify_chr, NULL, NULL, 985 s, s->worker_context, true); 986 } 987 988 colo_compare_timer_init(s); 989 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 990 } 991 992 static char *compare_get_pri_indev(Object *obj, Error **errp) 993 { 994 CompareState *s = COLO_COMPARE(obj); 995 996 return g_strdup(s->pri_indev); 997 } 998 999 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1000 { 1001 CompareState *s = COLO_COMPARE(obj); 1002 1003 g_free(s->pri_indev); 1004 s->pri_indev = g_strdup(value); 1005 } 1006 1007 static char *compare_get_sec_indev(Object *obj, Error **errp) 1008 { 1009 CompareState *s = COLO_COMPARE(obj); 1010 1011 return g_strdup(s->sec_indev); 1012 } 1013 1014 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1015 { 1016 CompareState *s = COLO_COMPARE(obj); 1017 1018 g_free(s->sec_indev); 1019 s->sec_indev = g_strdup(value); 1020 } 1021 1022 static char *compare_get_outdev(Object *obj, Error **errp) 1023 { 1024 CompareState *s = COLO_COMPARE(obj); 1025 1026 return g_strdup(s->outdev); 1027 } 1028 1029 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1030 { 1031 CompareState *s = COLO_COMPARE(obj); 1032 1033 g_free(s->outdev); 1034 s->outdev = g_strdup(value); 1035 } 1036 1037 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1038 { 1039 CompareState *s = COLO_COMPARE(obj); 1040 1041 return s->vnet_hdr; 1042 } 1043 1044 static void compare_set_vnet_hdr(Object *obj, 1045 bool value, 1046 Error **errp) 1047 { 1048 CompareState *s = COLO_COMPARE(obj); 1049 1050 s->vnet_hdr = value; 1051 } 1052 1053 static char *compare_get_notify_dev(Object *obj, Error **errp) 1054 { 1055 CompareState *s = COLO_COMPARE(obj); 1056 1057 return g_strdup(s->notify_dev); 1058 } 1059 1060 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1061 { 1062 CompareState *s = COLO_COMPARE(obj); 1063 1064 g_free(s->notify_dev); 1065 s->notify_dev = g_strdup(value); 1066 } 1067 1068 static void compare_get_timeout(Object *obj, Visitor *v, 1069 const char *name, void *opaque, 1070 Error **errp) 1071 { 1072 CompareState *s = COLO_COMPARE(obj); 1073 uint64_t value = s->compare_timeout; 1074 1075 visit_type_uint64(v, name, &value, errp); 1076 } 1077 1078 static void compare_set_timeout(Object *obj, Visitor *v, 1079 const char *name, void *opaque, 1080 Error **errp) 1081 { 1082 CompareState *s = COLO_COMPARE(obj); 1083 uint32_t value; 1084 1085 if (!visit_type_uint32(v, name, &value, errp)) { 1086 return; 1087 } 1088 if (!value) { 1089 error_setg(errp, "Property '%s.%s' requires a positive value", 1090 object_get_typename(obj), name); 1091 return; 1092 } 1093 s->compare_timeout = value; 1094 } 1095 1096 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1097 const char *name, void *opaque, 1098 Error **errp) 1099 { 1100 CompareState *s = COLO_COMPARE(obj); 1101 uint32_t value = s->expired_scan_cycle; 1102 1103 visit_type_uint32(v, name, &value, errp); 1104 } 1105 1106 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1107 const char *name, void *opaque, 1108 Error **errp) 1109 { 1110 CompareState *s = COLO_COMPARE(obj); 1111 uint32_t value; 1112 1113 if (!visit_type_uint32(v, name, &value, errp)) { 1114 return; 1115 } 1116 if (!value) { 1117 error_setg(errp, "Property '%s.%s' requires a positive value", 1118 object_get_typename(obj), name); 1119 return; 1120 } 1121 s->expired_scan_cycle = value; 1122 } 1123 1124 static void get_max_queue_size(Object *obj, Visitor *v, 1125 const char *name, void *opaque, 1126 Error **errp) 1127 { 1128 uint32_t value = max_queue_size; 1129 1130 visit_type_uint32(v, name, &value, errp); 1131 } 1132 1133 static void set_max_queue_size(Object *obj, Visitor *v, 1134 const char *name, void *opaque, 1135 Error **errp) 1136 { 1137 Error *local_err = NULL; 1138 uint64_t value; 1139 1140 visit_type_uint64(v, name, &value, &local_err); 1141 if (local_err) { 1142 goto out; 1143 } 1144 if (!value) { 1145 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1146 object_get_typename(obj), name); 1147 goto out; 1148 } 1149 max_queue_size = value; 1150 1151 out: 1152 error_propagate(errp, local_err); 1153 } 1154 1155 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1156 { 1157 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1158 Connection *conn = NULL; 1159 1160 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1161 trace_colo_compare_main("primary: unsupported packet in"); 1162 compare_chr_send(s, 1163 pri_rs->buf, 1164 pri_rs->packet_len, 1165 pri_rs->vnet_hdr_len, 1166 false, 1167 false); 1168 } else { 1169 /* compare packet in the specified connection */ 1170 colo_compare_connection(conn, s); 1171 } 1172 } 1173 1174 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1175 { 1176 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1177 Connection *conn = NULL; 1178 1179 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1180 trace_colo_compare_main("secondary: unsupported packet in"); 1181 } else { 1182 /* compare packet in the specified connection */ 1183 colo_compare_connection(conn, s); 1184 } 1185 } 1186 1187 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1188 { 1189 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1190 1191 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1192 int ret; 1193 1194 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1195 notify_rs->buf, 1196 notify_rs->packet_len)) { 1197 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1198 if (ret < 0) { 1199 error_report("Notify Xen COLO-frame INIT failed"); 1200 } 1201 } else if (packet_matches_str("COLO_CHECKPOINT", 1202 notify_rs->buf, 1203 notify_rs->packet_len)) { 1204 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1205 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1206 } else { 1207 error_report("COLO compare got unsupported instruction"); 1208 } 1209 } 1210 1211 /* 1212 * Return 0 is success. 1213 * Return 1 is failed. 1214 */ 1215 static int find_and_check_chardev(Chardev **chr, 1216 char *chr_name, 1217 Error **errp) 1218 { 1219 *chr = qemu_chr_find(chr_name); 1220 if (*chr == NULL) { 1221 error_setg(errp, "Device '%s' not found", 1222 chr_name); 1223 return 1; 1224 } 1225 1226 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1227 error_setg(errp, "chardev \"%s\" is not reconnectable", 1228 chr_name); 1229 return 1; 1230 } 1231 1232 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1233 error_setg(errp, "chardev \"%s\" cannot switch context", 1234 chr_name); 1235 return 1; 1236 } 1237 1238 return 0; 1239 } 1240 1241 /* 1242 * Called from the main thread on the primary 1243 * to setup colo-compare. 1244 */ 1245 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1246 { 1247 CompareState *s = COLO_COMPARE(uc); 1248 Chardev *chr; 1249 1250 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1251 error_setg(errp, "colo compare needs 'primary_in' ," 1252 "'secondary_in','outdev','iothread' property set"); 1253 return; 1254 } else if (!strcmp(s->pri_indev, s->outdev) || 1255 !strcmp(s->sec_indev, s->outdev) || 1256 !strcmp(s->pri_indev, s->sec_indev)) { 1257 error_setg(errp, "'indev' and 'outdev' could not be same " 1258 "for compare module"); 1259 return; 1260 } 1261 1262 if (!s->compare_timeout) { 1263 /* Set default value to 3000 MS */ 1264 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1265 } 1266 1267 if (!s->expired_scan_cycle) { 1268 /* Set default value to 3000 MS */ 1269 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1270 } 1271 1272 if (!max_queue_size) { 1273 /* Set default queue size to 1024 */ 1274 max_queue_size = MAX_QUEUE_SIZE; 1275 } 1276 1277 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1278 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1279 return; 1280 } 1281 1282 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1283 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1284 return; 1285 } 1286 1287 if (find_and_check_chardev(&chr, s->outdev, errp) || 1288 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1289 return; 1290 } 1291 1292 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1293 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1294 1295 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1296 if (s->notify_dev) { 1297 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1298 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1299 return; 1300 } 1301 1302 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1303 s->vnet_hdr); 1304 } 1305 1306 s->out_sendco.s = s; 1307 s->out_sendco.chr = &s->chr_out; 1308 s->out_sendco.notify_remote_frame = false; 1309 s->out_sendco.done = true; 1310 g_queue_init(&s->out_sendco.send_list); 1311 1312 if (s->notify_dev) { 1313 s->notify_sendco.s = s; 1314 s->notify_sendco.chr = &s->chr_notify_dev; 1315 s->notify_sendco.notify_remote_frame = true; 1316 s->notify_sendco.done = true; 1317 g_queue_init(&s->notify_sendco.send_list); 1318 } 1319 1320 g_queue_init(&s->conn_list); 1321 1322 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1323 connection_key_equal, 1324 g_free, 1325 connection_destroy); 1326 1327 colo_compare_iothread(s); 1328 1329 qemu_mutex_lock(&colo_compare_mutex); 1330 if (!colo_compare_active) { 1331 qemu_mutex_init(&event_mtx); 1332 qemu_cond_init(&event_complete_cond); 1333 colo_compare_active = true; 1334 } 1335 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1336 qemu_mutex_unlock(&colo_compare_mutex); 1337 1338 return; 1339 } 1340 1341 static void colo_flush_packets(void *opaque, void *user_data) 1342 { 1343 CompareState *s = user_data; 1344 Connection *conn = opaque; 1345 Packet *pkt = NULL; 1346 1347 while (!g_queue_is_empty(&conn->primary_list)) { 1348 pkt = g_queue_pop_head(&conn->primary_list); 1349 compare_chr_send(s, 1350 pkt->data, 1351 pkt->size, 1352 pkt->vnet_hdr_len, 1353 false, 1354 true); 1355 packet_destroy_partial(pkt, NULL); 1356 } 1357 while (!g_queue_is_empty(&conn->secondary_list)) { 1358 pkt = g_queue_pop_head(&conn->secondary_list); 1359 packet_destroy(pkt, NULL); 1360 } 1361 } 1362 1363 static void colo_compare_class_init(ObjectClass *oc, void *data) 1364 { 1365 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1366 1367 ucc->complete = colo_compare_complete; 1368 } 1369 1370 static void colo_compare_init(Object *obj) 1371 { 1372 CompareState *s = COLO_COMPARE(obj); 1373 1374 object_property_add_str(obj, "primary_in", 1375 compare_get_pri_indev, compare_set_pri_indev); 1376 object_property_add_str(obj, "secondary_in", 1377 compare_get_sec_indev, compare_set_sec_indev); 1378 object_property_add_str(obj, "outdev", 1379 compare_get_outdev, compare_set_outdev); 1380 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1381 (Object **)&s->iothread, 1382 object_property_allow_set_link, 1383 OBJ_PROP_LINK_STRONG); 1384 /* This parameter just for Xen COLO */ 1385 object_property_add_str(obj, "notify_dev", 1386 compare_get_notify_dev, compare_set_notify_dev); 1387 1388 object_property_add(obj, "compare_timeout", "uint64", 1389 compare_get_timeout, 1390 compare_set_timeout, NULL, NULL); 1391 1392 object_property_add(obj, "expired_scan_cycle", "uint32", 1393 compare_get_expired_scan_cycle, 1394 compare_set_expired_scan_cycle, NULL, NULL); 1395 1396 object_property_add(obj, "max_queue_size", "uint32", 1397 get_max_queue_size, 1398 set_max_queue_size, NULL, NULL); 1399 1400 s->vnet_hdr = false; 1401 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1402 compare_set_vnet_hdr); 1403 } 1404 1405 void colo_compare_cleanup(void) 1406 { 1407 CompareState *tmp = NULL; 1408 CompareState *n = NULL; 1409 1410 QTAILQ_FOREACH_SAFE(tmp, &net_compares, next, n) { 1411 object_unparent(OBJECT(tmp)); 1412 } 1413 } 1414 1415 static void colo_compare_finalize(Object *obj) 1416 { 1417 CompareState *s = COLO_COMPARE(obj); 1418 CompareState *tmp = NULL; 1419 1420 qemu_mutex_lock(&colo_compare_mutex); 1421 QTAILQ_FOREACH(tmp, &net_compares, next) { 1422 if (tmp == s) { 1423 QTAILQ_REMOVE(&net_compares, s, next); 1424 break; 1425 } 1426 } 1427 if (QTAILQ_EMPTY(&net_compares)) { 1428 colo_compare_active = false; 1429 qemu_mutex_destroy(&event_mtx); 1430 qemu_cond_destroy(&event_complete_cond); 1431 } 1432 qemu_mutex_unlock(&colo_compare_mutex); 1433 1434 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1435 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1436 qemu_chr_fe_deinit(&s->chr_out, false); 1437 if (s->notify_dev) { 1438 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1439 } 1440 1441 colo_compare_timer_del(s); 1442 1443 qemu_bh_delete(s->event_bh); 1444 1445 AioContext *ctx = iothread_get_aio_context(s->iothread); 1446 aio_context_acquire(ctx); 1447 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1448 if (s->notify_dev) { 1449 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1450 } 1451 aio_context_release(ctx); 1452 1453 /* Release all unhandled packets after compare thead exited */ 1454 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1455 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1456 1457 g_queue_clear(&s->conn_list); 1458 g_queue_clear(&s->out_sendco.send_list); 1459 if (s->notify_dev) { 1460 g_queue_clear(&s->notify_sendco.send_list); 1461 } 1462 1463 if (s->connection_track_table) { 1464 g_hash_table_destroy(s->connection_track_table); 1465 } 1466 1467 object_unref(OBJECT(s->iothread)); 1468 1469 g_free(s->pri_indev); 1470 g_free(s->sec_indev); 1471 g_free(s->outdev); 1472 g_free(s->notify_dev); 1473 } 1474 1475 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1476 { 1477 colo_compare_active = false; 1478 qemu_mutex_init(&colo_compare_mutex); 1479 } 1480 1481 static const TypeInfo colo_compare_info = { 1482 .name = TYPE_COLO_COMPARE, 1483 .parent = TYPE_OBJECT, 1484 .instance_size = sizeof(CompareState), 1485 .instance_init = colo_compare_init, 1486 .instance_finalize = colo_compare_finalize, 1487 .class_size = sizeof(CompareClass), 1488 .class_init = colo_compare_class_init, 1489 .interfaces = (InterfaceInfo[]) { 1490 { TYPE_USER_CREATABLE }, 1491 { } 1492 } 1493 }; 1494 1495 static void register_types(void) 1496 { 1497 type_register_static(&colo_compare_info); 1498 } 1499 1500 type_init(register_types); 1501