1 /* 2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO) 3 * (a.k.a. Fault Tolerance or Continuous Replication) 4 * 5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 6 * Copyright (c) 2016 FUJITSU LIMITED 7 * Copyright (c) 2016 Intel Corporation 8 * 9 * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or 12 * later. See the COPYING file in the top-level directory. 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu-common.h" 17 #include "qemu/error-report.h" 18 #include "trace.h" 19 #include "qapi/error.h" 20 #include "net/net.h" 21 #include "net/eth.h" 22 #include "qom/object_interfaces.h" 23 #include "qemu/iov.h" 24 #include "qom/object.h" 25 #include "net/queue.h" 26 #include "chardev/char-fe.h" 27 #include "qemu/sockets.h" 28 #include "colo.h" 29 #include "sysemu/iothread.h" 30 #include "net/colo-compare.h" 31 #include "migration/colo.h" 32 #include "migration/migration.h" 33 #include "util.h" 34 35 #include "block/aio-wait.h" 36 #include "qemu/coroutine.h" 37 38 #define TYPE_COLO_COMPARE "colo-compare" 39 #define COLO_COMPARE(obj) \ 40 OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE) 41 42 static QTAILQ_HEAD(, CompareState) net_compares = 43 QTAILQ_HEAD_INITIALIZER(net_compares); 44 45 static NotifierList colo_compare_notifiers = 46 NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers); 47 48 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 49 #define MAX_QUEUE_SIZE 1024 50 51 #define COLO_COMPARE_FREE_PRIMARY 0x01 52 #define COLO_COMPARE_FREE_SECONDARY 0x02 53 54 #define REGULAR_PACKET_CHECK_MS 3000 55 #define DEFAULT_TIME_OUT_MS 3000 56 57 /* #define DEBUG_COLO_PACKETS */ 58 59 static QemuMutex colo_compare_mutex; 60 static bool colo_compare_active; 61 static QemuMutex event_mtx; 62 static QemuCond event_complete_cond; 63 static int event_unhandled_count; 64 static uint32_t max_queue_size; 65 66 /* 67 * + CompareState ++ 68 * | | 69 * +---------------+ +---------------+ +---------------+ 70 * | conn list + - > conn + ------- > conn + -- > ...... 71 * +---------------+ +---------------+ +---------------+ 72 * | | | | | | 73 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 74 * |primary | |secondary |primary | |secondary 75 * |packet | |packet + |packet | |packet + 76 * +--------+ +--------+ +--------+ +--------+ 77 * | | | | 78 * +---v----+ +---v----+ +---v----+ +---v----+ 79 * |primary | |secondary |primary | |secondary 80 * |packet | |packet + |packet | |packet + 81 * +--------+ +--------+ +--------+ +--------+ 82 * | | | | 83 * +---v----+ +---v----+ +---v----+ +---v----+ 84 * |primary | |secondary |primary | |secondary 85 * |packet | |packet + |packet | |packet + 86 * +--------+ +--------+ +--------+ +--------+ 87 */ 88 89 typedef struct SendCo { 90 Coroutine *co; 91 struct CompareState *s; 92 CharBackend *chr; 93 GQueue send_list; 94 bool notify_remote_frame; 95 bool done; 96 int ret; 97 } SendCo; 98 99 typedef struct SendEntry { 100 uint32_t size; 101 uint32_t vnet_hdr_len; 102 uint8_t *buf; 103 } SendEntry; 104 105 typedef struct CompareState { 106 Object parent; 107 108 char *pri_indev; 109 char *sec_indev; 110 char *outdev; 111 char *notify_dev; 112 CharBackend chr_pri_in; 113 CharBackend chr_sec_in; 114 CharBackend chr_out; 115 CharBackend chr_notify_dev; 116 SocketReadState pri_rs; 117 SocketReadState sec_rs; 118 SocketReadState notify_rs; 119 SendCo out_sendco; 120 SendCo notify_sendco; 121 bool vnet_hdr; 122 uint32_t compare_timeout; 123 uint32_t expired_scan_cycle; 124 125 /* 126 * Record the connection that through the NIC 127 * Element type: Connection 128 */ 129 GQueue conn_list; 130 /* Record the connection without repetition */ 131 GHashTable *connection_track_table; 132 133 IOThread *iothread; 134 GMainContext *worker_context; 135 QEMUTimer *packet_check_timer; 136 137 QEMUBH *event_bh; 138 enum colo_event event; 139 140 QTAILQ_ENTRY(CompareState) next; 141 } CompareState; 142 143 typedef struct CompareClass { 144 ObjectClass parent_class; 145 } CompareClass; 146 147 enum { 148 PRIMARY_IN = 0, 149 SECONDARY_IN, 150 }; 151 152 static const char *colo_mode[] = { 153 [PRIMARY_IN] = "primary", 154 [SECONDARY_IN] = "secondary", 155 }; 156 157 static int compare_chr_send(CompareState *s, 158 uint8_t *buf, 159 uint32_t size, 160 uint32_t vnet_hdr_len, 161 bool notify_remote_frame, 162 bool zero_copy); 163 164 static bool packet_matches_str(const char *str, 165 const uint8_t *buf, 166 uint32_t packet_len) 167 { 168 if (packet_len != strlen(str)) { 169 return false; 170 } 171 172 return !memcmp(str, buf, strlen(str)); 173 } 174 175 static void notify_remote_frame(CompareState *s) 176 { 177 char msg[] = "DO_CHECKPOINT"; 178 int ret = 0; 179 180 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 181 if (ret < 0) { 182 error_report("Notify Xen COLO-frame failed"); 183 } 184 } 185 186 static void colo_compare_inconsistency_notify(CompareState *s) 187 { 188 if (s->notify_dev) { 189 notify_remote_frame(s); 190 } else { 191 notifier_list_notify(&colo_compare_notifiers, 192 migrate_get_current()); 193 } 194 } 195 196 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 197 { 198 struct tcp_hdr *atcp, *btcp; 199 200 atcp = (struct tcp_hdr *)(a->transport_header); 201 btcp = (struct tcp_hdr *)(b->transport_header); 202 return ntohl(atcp->th_seq) - ntohl(btcp->th_seq); 203 } 204 205 static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) 206 { 207 Packet *pkt = data; 208 struct tcp_hdr *tcphd; 209 210 tcphd = (struct tcp_hdr *)pkt->transport_header; 211 212 pkt->tcp_seq = ntohl(tcphd->th_seq); 213 pkt->tcp_ack = ntohl(tcphd->th_ack); 214 *max_ack = *max_ack > pkt->tcp_ack ? *max_ack : pkt->tcp_ack; 215 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 216 + (tcphd->th_off << 2) - pkt->vnet_hdr_len; 217 pkt->payload_size = pkt->size - pkt->header_size; 218 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 219 pkt->flags = tcphd->th_flags; 220 } 221 222 /* 223 * Return 1 on success, if return 0 means the 224 * packet will be dropped 225 */ 226 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 227 { 228 if (g_queue_get_length(queue) <= max_queue_size) { 229 if (pkt->ip->ip_p == IPPROTO_TCP) { 230 fill_pkt_tcp_info(pkt, max_ack); 231 g_queue_insert_sorted(queue, 232 pkt, 233 (GCompareDataFunc)seq_sorter, 234 NULL); 235 } else { 236 g_queue_push_tail(queue, pkt); 237 } 238 return 1; 239 } 240 return 0; 241 } 242 243 /* 244 * Return 0 on success, if return -1 means the pkt 245 * is unsupported(arp and ipv6) and will be sent later 246 */ 247 static int packet_enqueue(CompareState *s, int mode, Connection **con) 248 { 249 ConnectionKey key; 250 Packet *pkt = NULL; 251 Connection *conn; 252 int ret; 253 254 if (mode == PRIMARY_IN) { 255 pkt = packet_new(s->pri_rs.buf, 256 s->pri_rs.packet_len, 257 s->pri_rs.vnet_hdr_len); 258 } else { 259 pkt = packet_new(s->sec_rs.buf, 260 s->sec_rs.packet_len, 261 s->sec_rs.vnet_hdr_len); 262 } 263 264 if (parse_packet_early(pkt)) { 265 packet_destroy(pkt, NULL); 266 pkt = NULL; 267 return -1; 268 } 269 fill_connection_key(pkt, &key); 270 271 conn = connection_get(s->connection_track_table, 272 &key, 273 &s->conn_list); 274 275 if (!conn->processing) { 276 g_queue_push_tail(&s->conn_list, conn); 277 conn->processing = true; 278 } 279 280 if (mode == PRIMARY_IN) { 281 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 282 } else { 283 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 284 } 285 286 if (!ret) { 287 trace_colo_compare_drop_packet(colo_mode[mode], 288 "queue size too big, drop packet"); 289 packet_destroy(pkt, NULL); 290 pkt = NULL; 291 } 292 293 *con = conn; 294 295 return 0; 296 } 297 298 static inline bool after(uint32_t seq1, uint32_t seq2) 299 { 300 return (int32_t)(seq1 - seq2) > 0; 301 } 302 303 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 304 { 305 int ret; 306 ret = compare_chr_send(s, 307 pkt->data, 308 pkt->size, 309 pkt->vnet_hdr_len, 310 false, 311 true); 312 if (ret < 0) { 313 error_report("colo send primary packet failed"); 314 } 315 trace_colo_compare_main("packet same and release packet"); 316 packet_destroy_partial(pkt, NULL); 317 } 318 319 /* 320 * The IP packets sent by primary and secondary 321 * will be compared in here 322 * TODO support ip fragment, Out-Of-Order 323 * return: 0 means packet same 324 * > 0 || < 0 means packet different 325 */ 326 static int colo_compare_packet_payload(Packet *ppkt, 327 Packet *spkt, 328 uint16_t poffset, 329 uint16_t soffset, 330 uint16_t len) 331 332 { 333 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 334 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 335 336 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 337 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 338 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 339 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 340 341 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 342 pri_ip_dst, spkt->size, 343 sec_ip_src, sec_ip_dst); 344 } 345 346 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 347 } 348 349 /* 350 * return true means that the payload is consist and 351 * need to make the next comparison, false means do 352 * the checkpoint 353 */ 354 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 355 int8_t *mark, uint32_t max_ack) 356 { 357 *mark = 0; 358 359 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 360 if (!colo_compare_packet_payload(ppkt, spkt, 361 ppkt->header_size, spkt->header_size, 362 ppkt->payload_size)) { 363 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 364 return true; 365 } 366 } 367 368 /* one part of secondary packet payload still need to be compared */ 369 if (!after(ppkt->seq_end, spkt->seq_end)) { 370 if (!colo_compare_packet_payload(ppkt, spkt, 371 ppkt->header_size + ppkt->offset, 372 spkt->header_size + spkt->offset, 373 ppkt->payload_size - ppkt->offset)) { 374 if (!after(ppkt->tcp_ack, max_ack)) { 375 *mark = COLO_COMPARE_FREE_PRIMARY; 376 spkt->offset += ppkt->payload_size - ppkt->offset; 377 return true; 378 } else { 379 /* secondary guest hasn't ack the data, don't send 380 * out this packet 381 */ 382 return false; 383 } 384 } 385 } else { 386 /* primary packet is longer than secondary packet, compare 387 * the same part and mark the primary packet offset 388 */ 389 if (!colo_compare_packet_payload(ppkt, spkt, 390 ppkt->header_size + ppkt->offset, 391 spkt->header_size + spkt->offset, 392 spkt->payload_size - spkt->offset)) { 393 *mark = COLO_COMPARE_FREE_SECONDARY; 394 ppkt->offset += spkt->payload_size - spkt->offset; 395 return true; 396 } 397 } 398 399 return false; 400 } 401 402 static void colo_compare_tcp(CompareState *s, Connection *conn) 403 { 404 Packet *ppkt = NULL, *spkt = NULL; 405 int8_t mark; 406 407 /* 408 * If ppkt and spkt have the same payload, but ppkt's ACK 409 * is greater than spkt's ACK, in this case we can not 410 * send the ppkt because it will cause the secondary guest 411 * to miss sending some data in the next. Therefore, we 412 * record the maximum ACK in the current queue at both 413 * primary side and secondary side. Only when the ack is 414 * less than the smaller of the two maximum ack, then we 415 * can ensure that the packet's payload is acknowledged by 416 * primary and secondary. 417 */ 418 uint32_t min_ack = conn->pack > conn->sack ? 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 } 483 if (mark == COLO_COMPARE_FREE_SECONDARY) { 484 conn->compare_seq = spkt->seq_end; 485 packet_destroy(spkt, NULL); 486 goto sec; 487 } 488 if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 489 conn->compare_seq = ppkt->seq_end; 490 colo_release_primary_pkt(s, ppkt); 491 packet_destroy(spkt, NULL); 492 goto pri; 493 } 494 } else { 495 g_queue_push_head(&conn->primary_list, ppkt); 496 g_queue_push_head(&conn->secondary_list, spkt); 497 498 #ifdef DEBUG_COLO_PACKETS 499 qemu_hexdump((char *)ppkt->data, stderr, 500 "colo-compare ppkt", ppkt->size); 501 qemu_hexdump((char *)spkt->data, stderr, 502 "colo-compare spkt", spkt->size); 503 #endif 504 505 colo_compare_inconsistency_notify(s); 506 } 507 } 508 509 510 /* 511 * Called from the compare thread on the primary 512 * for compare udp packet 513 */ 514 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 515 { 516 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 517 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 518 519 trace_colo_compare_main("compare udp"); 520 521 /* 522 * Because of ppkt and spkt are both in the same connection, 523 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 524 * same with spkt. In addition, IP header's Identification is a random 525 * field, we can handle it in IP fragmentation function later. 526 * COLO just concern the response net packet payload from primary guest 527 * and secondary guest are same or not, So we ignored all IP header include 528 * other field like TOS,TTL,IP Checksum. we only need to compare 529 * the ip payload here. 530 */ 531 if (ppkt->size != spkt->size) { 532 trace_colo_compare_main("UDP: payload size of packets are different"); 533 return -1; 534 } 535 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 536 ppkt->size - offset)) { 537 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 538 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 539 #ifdef DEBUG_COLO_PACKETS 540 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 541 ppkt->size); 542 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 543 spkt->size); 544 #endif 545 return -1; 546 } else { 547 return 0; 548 } 549 } 550 551 /* 552 * Called from the compare thread on the primary 553 * for compare icmp packet 554 */ 555 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 556 { 557 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 558 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 559 560 trace_colo_compare_main("compare icmp"); 561 562 /* 563 * Because of ppkt and spkt are both in the same connection, 564 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 565 * same with spkt. In addition, IP header's Identification is a random 566 * field, we can handle it in IP fragmentation function later. 567 * COLO just concern the response net packet payload from primary guest 568 * and secondary guest are same or not, So we ignored all IP header include 569 * other field like TOS,TTL,IP Checksum. we only need to compare 570 * the ip payload here. 571 */ 572 if (ppkt->size != spkt->size) { 573 trace_colo_compare_main("ICMP: payload size of packets are different"); 574 return -1; 575 } 576 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 577 ppkt->size - offset)) { 578 trace_colo_compare_icmp_miscompare("primary pkt size", 579 ppkt->size); 580 trace_colo_compare_icmp_miscompare("Secondary pkt size", 581 spkt->size); 582 #ifdef DEBUG_COLO_PACKETS 583 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 584 ppkt->size); 585 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 586 spkt->size); 587 #endif 588 return -1; 589 } else { 590 return 0; 591 } 592 } 593 594 /* 595 * Called from the compare thread on the primary 596 * for compare other packet 597 */ 598 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 599 { 600 uint16_t offset = ppkt->vnet_hdr_len; 601 602 trace_colo_compare_main("compare other"); 603 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 604 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 605 606 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 607 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 608 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 609 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 610 611 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 612 pri_ip_dst, spkt->size, 613 sec_ip_src, sec_ip_dst); 614 } 615 616 if (ppkt->size != spkt->size) { 617 trace_colo_compare_main("Other: payload size of packets are different"); 618 return -1; 619 } 620 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 621 ppkt->size - offset); 622 } 623 624 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 625 { 626 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 627 628 if ((now - pkt->creation_ms) > (*check_time)) { 629 trace_colo_old_packet_check_found(pkt->creation_ms); 630 return 0; 631 } else { 632 return 1; 633 } 634 } 635 636 void colo_compare_register_notifier(Notifier *notify) 637 { 638 notifier_list_add(&colo_compare_notifiers, notify); 639 } 640 641 void colo_compare_unregister_notifier(Notifier *notify) 642 { 643 notifier_remove(notify); 644 } 645 646 static int colo_old_packet_check_one_conn(Connection *conn, 647 CompareState *s) 648 { 649 GList *result = NULL; 650 651 result = g_queue_find_custom(&conn->primary_list, 652 &s->compare_timeout, 653 (GCompareFunc)colo_old_packet_check_one); 654 655 if (result) { 656 /* Do checkpoint will flush old packet */ 657 colo_compare_inconsistency_notify(s); 658 return 0; 659 } 660 661 return 1; 662 } 663 664 /* 665 * Look for old packets that the secondary hasn't matched, 666 * if we have some then we have to checkpoint to wake 667 * the secondary up. 668 */ 669 static void colo_old_packet_check(void *opaque) 670 { 671 CompareState *s = opaque; 672 673 /* 674 * If we find one old packet, stop finding job and notify 675 * COLO frame do checkpoint. 676 */ 677 g_queue_find_custom(&s->conn_list, s, 678 (GCompareFunc)colo_old_packet_check_one_conn); 679 } 680 681 static void colo_compare_packet(CompareState *s, Connection *conn, 682 int (*HandlePacket)(Packet *spkt, 683 Packet *ppkt)) 684 { 685 Packet *pkt = NULL; 686 GList *result = NULL; 687 688 while (!g_queue_is_empty(&conn->primary_list) && 689 !g_queue_is_empty(&conn->secondary_list)) { 690 pkt = g_queue_pop_head(&conn->primary_list); 691 result = g_queue_find_custom(&conn->secondary_list, 692 pkt, (GCompareFunc)HandlePacket); 693 694 if (result) { 695 colo_release_primary_pkt(s, pkt); 696 g_queue_remove(&conn->secondary_list, result->data); 697 } else { 698 /* 699 * If one packet arrive late, the secondary_list or 700 * primary_list will be empty, so we can't compare it 701 * until next comparison. If the packets in the list are 702 * timeout, it will trigger a checkpoint request. 703 */ 704 trace_colo_compare_main("packet different"); 705 g_queue_push_head(&conn->primary_list, pkt); 706 707 colo_compare_inconsistency_notify(s); 708 break; 709 } 710 } 711 } 712 713 /* 714 * Called from the compare thread on the primary 715 * for compare packet with secondary list of the 716 * specified connection when a new packet was 717 * queued to it. 718 */ 719 static void colo_compare_connection(void *opaque, void *user_data) 720 { 721 CompareState *s = user_data; 722 Connection *conn = opaque; 723 724 switch (conn->ip_proto) { 725 case IPPROTO_TCP: 726 colo_compare_tcp(s, conn); 727 break; 728 case IPPROTO_UDP: 729 colo_compare_packet(s, conn, colo_packet_compare_udp); 730 break; 731 case IPPROTO_ICMP: 732 colo_compare_packet(s, conn, colo_packet_compare_icmp); 733 break; 734 default: 735 colo_compare_packet(s, conn, colo_packet_compare_other); 736 break; 737 } 738 } 739 740 static void coroutine_fn _compare_chr_send(void *opaque) 741 { 742 SendCo *sendco = opaque; 743 CompareState *s = sendco->s; 744 int ret = 0; 745 746 while (!g_queue_is_empty(&sendco->send_list)) { 747 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 748 uint32_t len = htonl(entry->size); 749 750 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 751 752 if (ret != sizeof(len)) { 753 g_free(entry->buf); 754 g_slice_free(SendEntry, entry); 755 goto err; 756 } 757 758 if (!sendco->notify_remote_frame && s->vnet_hdr) { 759 /* 760 * We send vnet header len make other module(like filter-redirector) 761 * know how to parse net packet correctly. 762 */ 763 len = htonl(entry->vnet_hdr_len); 764 765 ret = qemu_chr_fe_write_all(sendco->chr, 766 (uint8_t *)&len, 767 sizeof(len)); 768 769 if (ret != sizeof(len)) { 770 g_free(entry->buf); 771 g_slice_free(SendEntry, entry); 772 goto err; 773 } 774 } 775 776 ret = qemu_chr_fe_write_all(sendco->chr, 777 (uint8_t *)entry->buf, 778 entry->size); 779 780 if (ret != entry->size) { 781 g_free(entry->buf); 782 g_slice_free(SendEntry, entry); 783 goto err; 784 } 785 786 g_free(entry->buf); 787 g_slice_free(SendEntry, entry); 788 } 789 790 sendco->ret = 0; 791 goto out; 792 793 err: 794 while (!g_queue_is_empty(&sendco->send_list)) { 795 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 796 g_free(entry->buf); 797 g_slice_free(SendEntry, entry); 798 } 799 sendco->ret = ret < 0 ? ret : -EIO; 800 out: 801 sendco->co = NULL; 802 sendco->done = true; 803 aio_wait_kick(); 804 } 805 806 static int compare_chr_send(CompareState *s, 807 uint8_t *buf, 808 uint32_t size, 809 uint32_t vnet_hdr_len, 810 bool notify_remote_frame, 811 bool zero_copy) 812 { 813 SendCo *sendco; 814 SendEntry *entry; 815 816 if (notify_remote_frame) { 817 sendco = &s->notify_sendco; 818 } else { 819 sendco = &s->out_sendco; 820 } 821 822 if (!size) { 823 return 0; 824 } 825 826 entry = g_slice_new(SendEntry); 827 entry->size = size; 828 entry->vnet_hdr_len = vnet_hdr_len; 829 if (zero_copy) { 830 entry->buf = buf; 831 } else { 832 entry->buf = g_malloc(size); 833 memcpy(entry->buf, buf, size); 834 } 835 g_queue_push_head(&sendco->send_list, entry); 836 837 if (sendco->done) { 838 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 839 sendco->done = false; 840 qemu_coroutine_enter(sendco->co); 841 if (sendco->done) { 842 /* report early errors */ 843 return sendco->ret; 844 } 845 } 846 847 /* assume success */ 848 return 0; 849 } 850 851 static int compare_chr_can_read(void *opaque) 852 { 853 return COMPARE_READ_LEN_MAX; 854 } 855 856 /* 857 * Called from the main thread on the primary for packets 858 * arriving over the socket from the primary. 859 */ 860 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 861 { 862 CompareState *s = COLO_COMPARE(opaque); 863 int ret; 864 865 ret = net_fill_rstate(&s->pri_rs, buf, size); 866 if (ret == -1) { 867 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 868 NULL, NULL, true); 869 error_report("colo-compare primary_in error"); 870 } 871 } 872 873 /* 874 * Called from the main thread on the primary for packets 875 * arriving over the socket from the secondary. 876 */ 877 static void compare_sec_chr_in(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->sec_rs, buf, size); 883 if (ret == -1) { 884 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 885 NULL, NULL, true); 886 error_report("colo-compare secondary_in error"); 887 } 888 } 889 890 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 891 { 892 CompareState *s = COLO_COMPARE(opaque); 893 int ret; 894 895 ret = net_fill_rstate(&s->notify_rs, buf, size); 896 if (ret == -1) { 897 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 898 NULL, NULL, true); 899 error_report("colo-compare notify_dev error"); 900 } 901 } 902 903 /* 904 * Check old packet regularly so it can watch for any packets 905 * that the secondary hasn't produced equivalents of. 906 */ 907 static void check_old_packet_regular(void *opaque) 908 { 909 CompareState *s = opaque; 910 911 /* if have old packet we will notify checkpoint */ 912 colo_old_packet_check(s); 913 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 914 s->expired_scan_cycle); 915 } 916 917 /* Public API, Used for COLO frame to notify compare event */ 918 void colo_notify_compares_event(void *opaque, int event, Error **errp) 919 { 920 CompareState *s; 921 qemu_mutex_lock(&colo_compare_mutex); 922 923 if (!colo_compare_active) { 924 qemu_mutex_unlock(&colo_compare_mutex); 925 return; 926 } 927 928 qemu_mutex_lock(&event_mtx); 929 QTAILQ_FOREACH(s, &net_compares, next) { 930 s->event = event; 931 qemu_bh_schedule(s->event_bh); 932 event_unhandled_count++; 933 } 934 /* Wait all compare threads to finish handling this event */ 935 while (event_unhandled_count > 0) { 936 qemu_cond_wait(&event_complete_cond, &event_mtx); 937 } 938 939 qemu_mutex_unlock(&event_mtx); 940 qemu_mutex_unlock(&colo_compare_mutex); 941 } 942 943 static void colo_compare_timer_init(CompareState *s) 944 { 945 AioContext *ctx = iothread_get_aio_context(s->iothread); 946 947 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, 948 SCALE_MS, check_old_packet_regular, 949 s); 950 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 951 s->expired_scan_cycle); 952 } 953 954 static void colo_compare_timer_del(CompareState *s) 955 { 956 if (s->packet_check_timer) { 957 timer_del(s->packet_check_timer); 958 timer_free(s->packet_check_timer); 959 s->packet_check_timer = NULL; 960 } 961 } 962 963 static void colo_flush_packets(void *opaque, void *user_data); 964 965 static void colo_compare_handle_event(void *opaque) 966 { 967 CompareState *s = opaque; 968 969 switch (s->event) { 970 case COLO_EVENT_CHECKPOINT: 971 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 972 break; 973 case COLO_EVENT_FAILOVER: 974 break; 975 default: 976 break; 977 } 978 979 qemu_mutex_lock(&event_mtx); 980 assert(event_unhandled_count > 0); 981 event_unhandled_count--; 982 qemu_cond_broadcast(&event_complete_cond); 983 qemu_mutex_unlock(&event_mtx); 984 } 985 986 static void colo_compare_iothread(CompareState *s) 987 { 988 AioContext *ctx = iothread_get_aio_context(s->iothread); 989 object_ref(OBJECT(s->iothread)); 990 s->worker_context = iothread_get_g_main_context(s->iothread); 991 992 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 993 compare_pri_chr_in, NULL, NULL, 994 s, s->worker_context, true); 995 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 996 compare_sec_chr_in, NULL, NULL, 997 s, s->worker_context, true); 998 if (s->notify_dev) { 999 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 1000 compare_notify_chr, NULL, NULL, 1001 s, s->worker_context, true); 1002 } 1003 1004 colo_compare_timer_init(s); 1005 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 1006 } 1007 1008 static char *compare_get_pri_indev(Object *obj, Error **errp) 1009 { 1010 CompareState *s = COLO_COMPARE(obj); 1011 1012 return g_strdup(s->pri_indev); 1013 } 1014 1015 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1016 { 1017 CompareState *s = COLO_COMPARE(obj); 1018 1019 g_free(s->pri_indev); 1020 s->pri_indev = g_strdup(value); 1021 } 1022 1023 static char *compare_get_sec_indev(Object *obj, Error **errp) 1024 { 1025 CompareState *s = COLO_COMPARE(obj); 1026 1027 return g_strdup(s->sec_indev); 1028 } 1029 1030 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1031 { 1032 CompareState *s = COLO_COMPARE(obj); 1033 1034 g_free(s->sec_indev); 1035 s->sec_indev = g_strdup(value); 1036 } 1037 1038 static char *compare_get_outdev(Object *obj, Error **errp) 1039 { 1040 CompareState *s = COLO_COMPARE(obj); 1041 1042 return g_strdup(s->outdev); 1043 } 1044 1045 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1046 { 1047 CompareState *s = COLO_COMPARE(obj); 1048 1049 g_free(s->outdev); 1050 s->outdev = g_strdup(value); 1051 } 1052 1053 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1054 { 1055 CompareState *s = COLO_COMPARE(obj); 1056 1057 return s->vnet_hdr; 1058 } 1059 1060 static void compare_set_vnet_hdr(Object *obj, 1061 bool value, 1062 Error **errp) 1063 { 1064 CompareState *s = COLO_COMPARE(obj); 1065 1066 s->vnet_hdr = value; 1067 } 1068 1069 static char *compare_get_notify_dev(Object *obj, Error **errp) 1070 { 1071 CompareState *s = COLO_COMPARE(obj); 1072 1073 return g_strdup(s->notify_dev); 1074 } 1075 1076 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1077 { 1078 CompareState *s = COLO_COMPARE(obj); 1079 1080 g_free(s->notify_dev); 1081 s->notify_dev = g_strdup(value); 1082 } 1083 1084 static void compare_get_timeout(Object *obj, Visitor *v, 1085 const char *name, void *opaque, 1086 Error **errp) 1087 { 1088 CompareState *s = COLO_COMPARE(obj); 1089 uint32_t value = s->compare_timeout; 1090 1091 visit_type_uint32(v, name, &value, errp); 1092 } 1093 1094 static void compare_set_timeout(Object *obj, Visitor *v, 1095 const char *name, void *opaque, 1096 Error **errp) 1097 { 1098 CompareState *s = COLO_COMPARE(obj); 1099 uint32_t value; 1100 1101 if (!visit_type_uint32(v, name, &value, errp)) { 1102 return; 1103 } 1104 if (!value) { 1105 error_setg(errp, "Property '%s.%s' requires a positive value", 1106 object_get_typename(obj), name); 1107 return; 1108 } 1109 s->compare_timeout = value; 1110 } 1111 1112 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1113 const char *name, void *opaque, 1114 Error **errp) 1115 { 1116 CompareState *s = COLO_COMPARE(obj); 1117 uint32_t value = s->expired_scan_cycle; 1118 1119 visit_type_uint32(v, name, &value, errp); 1120 } 1121 1122 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1123 const char *name, void *opaque, 1124 Error **errp) 1125 { 1126 CompareState *s = COLO_COMPARE(obj); 1127 uint32_t value; 1128 1129 if (!visit_type_uint32(v, name, &value, errp)) { 1130 return; 1131 } 1132 if (!value) { 1133 error_setg(errp, "Property '%s.%s' requires a positive value", 1134 object_get_typename(obj), name); 1135 return; 1136 } 1137 s->expired_scan_cycle = value; 1138 } 1139 1140 static void get_max_queue_size(Object *obj, Visitor *v, 1141 const char *name, void *opaque, 1142 Error **errp) 1143 { 1144 uint32_t value = max_queue_size; 1145 1146 visit_type_uint32(v, name, &value, errp); 1147 } 1148 1149 static void set_max_queue_size(Object *obj, Visitor *v, 1150 const char *name, void *opaque, 1151 Error **errp) 1152 { 1153 Error *local_err = NULL; 1154 uint32_t value; 1155 1156 visit_type_uint32(v, name, &value, &local_err); 1157 if (local_err) { 1158 goto out; 1159 } 1160 if (!value) { 1161 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1162 object_get_typename(obj), name); 1163 goto out; 1164 } 1165 max_queue_size = value; 1166 1167 out: 1168 error_propagate(errp, local_err); 1169 } 1170 1171 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1172 { 1173 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1174 Connection *conn = NULL; 1175 1176 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1177 trace_colo_compare_main("primary: unsupported packet in"); 1178 compare_chr_send(s, 1179 pri_rs->buf, 1180 pri_rs->packet_len, 1181 pri_rs->vnet_hdr_len, 1182 false, 1183 false); 1184 } else { 1185 /* compare packet in the specified connection */ 1186 colo_compare_connection(conn, s); 1187 } 1188 } 1189 1190 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1191 { 1192 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1193 Connection *conn = NULL; 1194 1195 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1196 trace_colo_compare_main("secondary: unsupported packet in"); 1197 } else { 1198 /* compare packet in the specified connection */ 1199 colo_compare_connection(conn, s); 1200 } 1201 } 1202 1203 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1204 { 1205 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1206 1207 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1208 int ret; 1209 1210 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1211 notify_rs->buf, 1212 notify_rs->packet_len)) { 1213 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1214 if (ret < 0) { 1215 error_report("Notify Xen COLO-frame INIT failed"); 1216 } 1217 } else if (packet_matches_str("COLO_CHECKPOINT", 1218 notify_rs->buf, 1219 notify_rs->packet_len)) { 1220 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1221 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1222 } else { 1223 error_report("COLO compare got unsupported instruction"); 1224 } 1225 } 1226 1227 /* 1228 * Return 0 is success. 1229 * Return 1 is failed. 1230 */ 1231 static int find_and_check_chardev(Chardev **chr, 1232 char *chr_name, 1233 Error **errp) 1234 { 1235 *chr = qemu_chr_find(chr_name); 1236 if (*chr == NULL) { 1237 error_setg(errp, "Device '%s' not found", 1238 chr_name); 1239 return 1; 1240 } 1241 1242 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1243 error_setg(errp, "chardev \"%s\" is not reconnectable", 1244 chr_name); 1245 return 1; 1246 } 1247 1248 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1249 error_setg(errp, "chardev \"%s\" cannot switch context", 1250 chr_name); 1251 return 1; 1252 } 1253 1254 return 0; 1255 } 1256 1257 /* 1258 * Called from the main thread on the primary 1259 * to setup colo-compare. 1260 */ 1261 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1262 { 1263 CompareState *s = COLO_COMPARE(uc); 1264 Chardev *chr; 1265 1266 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1267 error_setg(errp, "colo compare needs 'primary_in' ," 1268 "'secondary_in','outdev','iothread' property set"); 1269 return; 1270 } else if (!strcmp(s->pri_indev, s->outdev) || 1271 !strcmp(s->sec_indev, s->outdev) || 1272 !strcmp(s->pri_indev, s->sec_indev)) { 1273 error_setg(errp, "'indev' and 'outdev' could not be same " 1274 "for compare module"); 1275 return; 1276 } 1277 1278 if (!s->compare_timeout) { 1279 /* Set default value to 3000 MS */ 1280 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1281 } 1282 1283 if (!s->expired_scan_cycle) { 1284 /* Set default value to 3000 MS */ 1285 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1286 } 1287 1288 if (!max_queue_size) { 1289 /* Set default queue size to 1024 */ 1290 max_queue_size = MAX_QUEUE_SIZE; 1291 } 1292 1293 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1294 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1295 return; 1296 } 1297 1298 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1299 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1300 return; 1301 } 1302 1303 if (find_and_check_chardev(&chr, s->outdev, errp) || 1304 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1305 return; 1306 } 1307 1308 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1309 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1310 1311 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1312 if (s->notify_dev) { 1313 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1314 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1315 return; 1316 } 1317 1318 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1319 s->vnet_hdr); 1320 } 1321 1322 s->out_sendco.s = s; 1323 s->out_sendco.chr = &s->chr_out; 1324 s->out_sendco.notify_remote_frame = false; 1325 s->out_sendco.done = true; 1326 g_queue_init(&s->out_sendco.send_list); 1327 1328 if (s->notify_dev) { 1329 s->notify_sendco.s = s; 1330 s->notify_sendco.chr = &s->chr_notify_dev; 1331 s->notify_sendco.notify_remote_frame = true; 1332 s->notify_sendco.done = true; 1333 g_queue_init(&s->notify_sendco.send_list); 1334 } 1335 1336 g_queue_init(&s->conn_list); 1337 1338 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1339 connection_key_equal, 1340 g_free, 1341 connection_destroy); 1342 1343 colo_compare_iothread(s); 1344 1345 qemu_mutex_lock(&colo_compare_mutex); 1346 if (!colo_compare_active) { 1347 qemu_mutex_init(&event_mtx); 1348 qemu_cond_init(&event_complete_cond); 1349 colo_compare_active = true; 1350 } 1351 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1352 qemu_mutex_unlock(&colo_compare_mutex); 1353 1354 return; 1355 } 1356 1357 static void colo_flush_packets(void *opaque, void *user_data) 1358 { 1359 CompareState *s = user_data; 1360 Connection *conn = opaque; 1361 Packet *pkt = NULL; 1362 1363 while (!g_queue_is_empty(&conn->primary_list)) { 1364 pkt = g_queue_pop_head(&conn->primary_list); 1365 compare_chr_send(s, 1366 pkt->data, 1367 pkt->size, 1368 pkt->vnet_hdr_len, 1369 false, 1370 true); 1371 packet_destroy_partial(pkt, NULL); 1372 } 1373 while (!g_queue_is_empty(&conn->secondary_list)) { 1374 pkt = g_queue_pop_head(&conn->secondary_list); 1375 packet_destroy(pkt, NULL); 1376 } 1377 } 1378 1379 static void colo_compare_class_init(ObjectClass *oc, void *data) 1380 { 1381 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1382 1383 ucc->complete = colo_compare_complete; 1384 } 1385 1386 static void colo_compare_init(Object *obj) 1387 { 1388 CompareState *s = COLO_COMPARE(obj); 1389 1390 object_property_add_str(obj, "primary_in", 1391 compare_get_pri_indev, compare_set_pri_indev); 1392 object_property_add_str(obj, "secondary_in", 1393 compare_get_sec_indev, compare_set_sec_indev); 1394 object_property_add_str(obj, "outdev", 1395 compare_get_outdev, compare_set_outdev); 1396 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1397 (Object **)&s->iothread, 1398 object_property_allow_set_link, 1399 OBJ_PROP_LINK_STRONG); 1400 /* This parameter just for Xen COLO */ 1401 object_property_add_str(obj, "notify_dev", 1402 compare_get_notify_dev, compare_set_notify_dev); 1403 1404 object_property_add(obj, "compare_timeout", "uint32", 1405 compare_get_timeout, 1406 compare_set_timeout, NULL, NULL); 1407 1408 object_property_add(obj, "expired_scan_cycle", "uint32", 1409 compare_get_expired_scan_cycle, 1410 compare_set_expired_scan_cycle, NULL, NULL); 1411 1412 object_property_add(obj, "max_queue_size", "uint32", 1413 get_max_queue_size, 1414 set_max_queue_size, NULL, NULL); 1415 1416 s->vnet_hdr = false; 1417 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1418 compare_set_vnet_hdr); 1419 } 1420 1421 static void colo_compare_finalize(Object *obj) 1422 { 1423 CompareState *s = COLO_COMPARE(obj); 1424 CompareState *tmp = NULL; 1425 1426 qemu_mutex_lock(&colo_compare_mutex); 1427 QTAILQ_FOREACH(tmp, &net_compares, next) { 1428 if (tmp == s) { 1429 QTAILQ_REMOVE(&net_compares, s, next); 1430 break; 1431 } 1432 } 1433 if (QTAILQ_EMPTY(&net_compares)) { 1434 colo_compare_active = false; 1435 qemu_mutex_destroy(&event_mtx); 1436 qemu_cond_destroy(&event_complete_cond); 1437 } 1438 qemu_mutex_unlock(&colo_compare_mutex); 1439 1440 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1441 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1442 qemu_chr_fe_deinit(&s->chr_out, false); 1443 if (s->notify_dev) { 1444 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1445 } 1446 1447 colo_compare_timer_del(s); 1448 1449 qemu_bh_delete(s->event_bh); 1450 1451 AioContext *ctx = iothread_get_aio_context(s->iothread); 1452 aio_context_acquire(ctx); 1453 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1454 if (s->notify_dev) { 1455 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1456 } 1457 aio_context_release(ctx); 1458 1459 /* Release all unhandled packets after compare thead exited */ 1460 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1461 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1462 1463 g_queue_clear(&s->conn_list); 1464 g_queue_clear(&s->out_sendco.send_list); 1465 if (s->notify_dev) { 1466 g_queue_clear(&s->notify_sendco.send_list); 1467 } 1468 1469 if (s->connection_track_table) { 1470 g_hash_table_destroy(s->connection_track_table); 1471 } 1472 1473 object_unref(OBJECT(s->iothread)); 1474 1475 g_free(s->pri_indev); 1476 g_free(s->sec_indev); 1477 g_free(s->outdev); 1478 g_free(s->notify_dev); 1479 } 1480 1481 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1482 { 1483 colo_compare_active = false; 1484 qemu_mutex_init(&colo_compare_mutex); 1485 } 1486 1487 static const TypeInfo colo_compare_info = { 1488 .name = TYPE_COLO_COMPARE, 1489 .parent = TYPE_OBJECT, 1490 .instance_size = sizeof(CompareState), 1491 .instance_init = colo_compare_init, 1492 .instance_finalize = colo_compare_finalize, 1493 .class_size = sizeof(CompareClass), 1494 .class_init = colo_compare_class_init, 1495 .interfaces = (InterfaceInfo[]) { 1496 { TYPE_USER_CREATABLE }, 1497 { } 1498 } 1499 }; 1500 1501 static void register_types(void) 1502 { 1503 type_register_static(&colo_compare_info); 1504 } 1505 1506 type_init(register_types); 1507