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) - 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 } 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 (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 594 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 595 596 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 597 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 598 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 599 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 600 601 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 602 pri_ip_dst, spkt->size, 603 sec_ip_src, sec_ip_dst); 604 } 605 606 if (ppkt->size != spkt->size) { 607 trace_colo_compare_main("Other: payload size of packets are different"); 608 return -1; 609 } 610 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 611 ppkt->size - offset); 612 } 613 614 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 615 { 616 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 617 618 if ((now - pkt->creation_ms) > (*check_time)) { 619 trace_colo_old_packet_check_found(pkt->creation_ms); 620 return 0; 621 } else { 622 return 1; 623 } 624 } 625 626 void colo_compare_register_notifier(Notifier *notify) 627 { 628 notifier_list_add(&colo_compare_notifiers, notify); 629 } 630 631 void colo_compare_unregister_notifier(Notifier *notify) 632 { 633 notifier_remove(notify); 634 } 635 636 static int colo_old_packet_check_one_conn(Connection *conn, 637 CompareState *s) 638 { 639 if (!g_queue_is_empty(&conn->primary_list)) { 640 if (g_queue_find_custom(&conn->primary_list, 641 &s->compare_timeout, 642 (GCompareFunc)colo_old_packet_check_one)) 643 goto out; 644 } 645 646 if (!g_queue_is_empty(&conn->secondary_list)) { 647 if (g_queue_find_custom(&conn->secondary_list, 648 &s->compare_timeout, 649 (GCompareFunc)colo_old_packet_check_one)) 650 goto out; 651 } 652 653 return 1; 654 655 out: 656 /* Do checkpoint will flush old packet */ 657 colo_compare_inconsistency_notify(s); 658 return 0; 659 } 660 661 /* 662 * Look for old packets that the secondary hasn't matched, 663 * if we have some then we have to checkpoint to wake 664 * the secondary up. 665 */ 666 static void colo_old_packet_check(void *opaque) 667 { 668 CompareState *s = opaque; 669 670 /* 671 * If we find one old packet, stop finding job and notify 672 * COLO frame do checkpoint. 673 */ 674 g_queue_find_custom(&s->conn_list, s, 675 (GCompareFunc)colo_old_packet_check_one_conn); 676 } 677 678 static void colo_compare_packet(CompareState *s, Connection *conn, 679 int (*HandlePacket)(Packet *spkt, 680 Packet *ppkt)) 681 { 682 Packet *pkt = NULL; 683 GList *result = NULL; 684 685 while (!g_queue_is_empty(&conn->primary_list) && 686 !g_queue_is_empty(&conn->secondary_list)) { 687 pkt = g_queue_pop_head(&conn->primary_list); 688 result = g_queue_find_custom(&conn->secondary_list, 689 pkt, (GCompareFunc)HandlePacket); 690 691 if (result) { 692 colo_release_primary_pkt(s, pkt); 693 g_queue_remove(&conn->secondary_list, result->data); 694 } else { 695 /* 696 * If one packet arrive late, the secondary_list or 697 * primary_list will be empty, so we can't compare it 698 * until next comparison. If the packets in the list are 699 * timeout, it will trigger a checkpoint request. 700 */ 701 trace_colo_compare_main("packet different"); 702 g_queue_push_head(&conn->primary_list, pkt); 703 704 colo_compare_inconsistency_notify(s); 705 break; 706 } 707 } 708 } 709 710 /* 711 * Called from the compare thread on the primary 712 * for compare packet with secondary list of the 713 * specified connection when a new packet was 714 * queued to it. 715 */ 716 static void colo_compare_connection(void *opaque, void *user_data) 717 { 718 CompareState *s = user_data; 719 Connection *conn = opaque; 720 721 switch (conn->ip_proto) { 722 case IPPROTO_TCP: 723 colo_compare_tcp(s, conn); 724 break; 725 case IPPROTO_UDP: 726 colo_compare_packet(s, conn, colo_packet_compare_udp); 727 break; 728 case IPPROTO_ICMP: 729 colo_compare_packet(s, conn, colo_packet_compare_icmp); 730 break; 731 default: 732 colo_compare_packet(s, conn, colo_packet_compare_other); 733 break; 734 } 735 } 736 737 static void coroutine_fn _compare_chr_send(void *opaque) 738 { 739 SendCo *sendco = opaque; 740 CompareState *s = sendco->s; 741 int ret = 0; 742 743 while (!g_queue_is_empty(&sendco->send_list)) { 744 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 745 uint32_t len = htonl(entry->size); 746 747 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 748 749 if (ret != sizeof(len)) { 750 g_free(entry->buf); 751 g_slice_free(SendEntry, entry); 752 goto err; 753 } 754 755 if (!sendco->notify_remote_frame && s->vnet_hdr) { 756 /* 757 * We send vnet header len make other module(like filter-redirector) 758 * know how to parse net packet correctly. 759 */ 760 len = htonl(entry->vnet_hdr_len); 761 762 ret = qemu_chr_fe_write_all(sendco->chr, 763 (uint8_t *)&len, 764 sizeof(len)); 765 766 if (ret != sizeof(len)) { 767 g_free(entry->buf); 768 g_slice_free(SendEntry, entry); 769 goto err; 770 } 771 } 772 773 ret = qemu_chr_fe_write_all(sendco->chr, 774 (uint8_t *)entry->buf, 775 entry->size); 776 777 if (ret != entry->size) { 778 g_free(entry->buf); 779 g_slice_free(SendEntry, entry); 780 goto err; 781 } 782 783 g_free(entry->buf); 784 g_slice_free(SendEntry, entry); 785 } 786 787 sendco->ret = 0; 788 goto out; 789 790 err: 791 while (!g_queue_is_empty(&sendco->send_list)) { 792 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 793 g_free(entry->buf); 794 g_slice_free(SendEntry, entry); 795 } 796 sendco->ret = ret < 0 ? ret : -EIO; 797 out: 798 sendco->co = NULL; 799 sendco->done = true; 800 aio_wait_kick(); 801 } 802 803 static int compare_chr_send(CompareState *s, 804 uint8_t *buf, 805 uint32_t size, 806 uint32_t vnet_hdr_len, 807 bool notify_remote_frame, 808 bool zero_copy) 809 { 810 SendCo *sendco; 811 SendEntry *entry; 812 813 if (notify_remote_frame) { 814 sendco = &s->notify_sendco; 815 } else { 816 sendco = &s->out_sendco; 817 } 818 819 if (!size) { 820 return 0; 821 } 822 823 entry = g_slice_new(SendEntry); 824 entry->size = size; 825 entry->vnet_hdr_len = vnet_hdr_len; 826 if (zero_copy) { 827 entry->buf = buf; 828 } else { 829 entry->buf = g_malloc(size); 830 memcpy(entry->buf, buf, size); 831 } 832 g_queue_push_head(&sendco->send_list, entry); 833 834 if (sendco->done) { 835 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 836 sendco->done = false; 837 qemu_coroutine_enter(sendco->co); 838 if (sendco->done) { 839 /* report early errors */ 840 return sendco->ret; 841 } 842 } 843 844 /* assume success */ 845 return 0; 846 } 847 848 static int compare_chr_can_read(void *opaque) 849 { 850 return COMPARE_READ_LEN_MAX; 851 } 852 853 /* 854 * Called from the main thread on the primary for packets 855 * arriving over the socket from the primary. 856 */ 857 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 858 { 859 CompareState *s = COLO_COMPARE(opaque); 860 int ret; 861 862 ret = net_fill_rstate(&s->pri_rs, buf, size); 863 if (ret == -1) { 864 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 865 NULL, NULL, true); 866 error_report("colo-compare primary_in error"); 867 } 868 } 869 870 /* 871 * Called from the main thread on the primary for packets 872 * arriving over the socket from the secondary. 873 */ 874 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 875 { 876 CompareState *s = COLO_COMPARE(opaque); 877 int ret; 878 879 ret = net_fill_rstate(&s->sec_rs, buf, size); 880 if (ret == -1) { 881 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 882 NULL, NULL, true); 883 error_report("colo-compare secondary_in error"); 884 } 885 } 886 887 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 888 { 889 CompareState *s = COLO_COMPARE(opaque); 890 int ret; 891 892 ret = net_fill_rstate(&s->notify_rs, buf, size); 893 if (ret == -1) { 894 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 895 NULL, NULL, true); 896 error_report("colo-compare notify_dev error"); 897 } 898 } 899 900 /* 901 * Check old packet regularly so it can watch for any packets 902 * that the secondary hasn't produced equivalents of. 903 */ 904 static void check_old_packet_regular(void *opaque) 905 { 906 CompareState *s = opaque; 907 908 /* if have old packet we will notify checkpoint */ 909 colo_old_packet_check(s); 910 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 911 s->expired_scan_cycle); 912 } 913 914 /* Public API, Used for COLO frame to notify compare event */ 915 void colo_notify_compares_event(void *opaque, int event, Error **errp) 916 { 917 CompareState *s; 918 qemu_mutex_lock(&colo_compare_mutex); 919 920 if (!colo_compare_active) { 921 qemu_mutex_unlock(&colo_compare_mutex); 922 return; 923 } 924 925 qemu_mutex_lock(&event_mtx); 926 QTAILQ_FOREACH(s, &net_compares, next) { 927 s->event = event; 928 qemu_bh_schedule(s->event_bh); 929 event_unhandled_count++; 930 } 931 /* Wait all compare threads to finish handling this event */ 932 while (event_unhandled_count > 0) { 933 qemu_cond_wait(&event_complete_cond, &event_mtx); 934 } 935 936 qemu_mutex_unlock(&event_mtx); 937 qemu_mutex_unlock(&colo_compare_mutex); 938 } 939 940 static void colo_compare_timer_init(CompareState *s) 941 { 942 AioContext *ctx = iothread_get_aio_context(s->iothread); 943 944 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_HOST, 945 SCALE_MS, check_old_packet_regular, 946 s); 947 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 948 s->expired_scan_cycle); 949 } 950 951 static void colo_compare_timer_del(CompareState *s) 952 { 953 if (s->packet_check_timer) { 954 timer_del(s->packet_check_timer); 955 timer_free(s->packet_check_timer); 956 s->packet_check_timer = NULL; 957 } 958 } 959 960 static void colo_flush_packets(void *opaque, void *user_data); 961 962 static void colo_compare_handle_event(void *opaque) 963 { 964 CompareState *s = opaque; 965 966 switch (s->event) { 967 case COLO_EVENT_CHECKPOINT: 968 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 969 break; 970 case COLO_EVENT_FAILOVER: 971 break; 972 default: 973 break; 974 } 975 976 qemu_mutex_lock(&event_mtx); 977 assert(event_unhandled_count > 0); 978 event_unhandled_count--; 979 qemu_cond_broadcast(&event_complete_cond); 980 qemu_mutex_unlock(&event_mtx); 981 } 982 983 static void colo_compare_iothread(CompareState *s) 984 { 985 AioContext *ctx = iothread_get_aio_context(s->iothread); 986 object_ref(OBJECT(s->iothread)); 987 s->worker_context = iothread_get_g_main_context(s->iothread); 988 989 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 990 compare_pri_chr_in, NULL, NULL, 991 s, s->worker_context, true); 992 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 993 compare_sec_chr_in, NULL, NULL, 994 s, s->worker_context, true); 995 if (s->notify_dev) { 996 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 997 compare_notify_chr, NULL, NULL, 998 s, s->worker_context, true); 999 } 1000 1001 colo_compare_timer_init(s); 1002 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 1003 } 1004 1005 static char *compare_get_pri_indev(Object *obj, Error **errp) 1006 { 1007 CompareState *s = COLO_COMPARE(obj); 1008 1009 return g_strdup(s->pri_indev); 1010 } 1011 1012 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1013 { 1014 CompareState *s = COLO_COMPARE(obj); 1015 1016 g_free(s->pri_indev); 1017 s->pri_indev = g_strdup(value); 1018 } 1019 1020 static char *compare_get_sec_indev(Object *obj, Error **errp) 1021 { 1022 CompareState *s = COLO_COMPARE(obj); 1023 1024 return g_strdup(s->sec_indev); 1025 } 1026 1027 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1028 { 1029 CompareState *s = COLO_COMPARE(obj); 1030 1031 g_free(s->sec_indev); 1032 s->sec_indev = g_strdup(value); 1033 } 1034 1035 static char *compare_get_outdev(Object *obj, Error **errp) 1036 { 1037 CompareState *s = COLO_COMPARE(obj); 1038 1039 return g_strdup(s->outdev); 1040 } 1041 1042 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1043 { 1044 CompareState *s = COLO_COMPARE(obj); 1045 1046 g_free(s->outdev); 1047 s->outdev = g_strdup(value); 1048 } 1049 1050 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1051 { 1052 CompareState *s = COLO_COMPARE(obj); 1053 1054 return s->vnet_hdr; 1055 } 1056 1057 static void compare_set_vnet_hdr(Object *obj, 1058 bool value, 1059 Error **errp) 1060 { 1061 CompareState *s = COLO_COMPARE(obj); 1062 1063 s->vnet_hdr = value; 1064 } 1065 1066 static char *compare_get_notify_dev(Object *obj, Error **errp) 1067 { 1068 CompareState *s = COLO_COMPARE(obj); 1069 1070 return g_strdup(s->notify_dev); 1071 } 1072 1073 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1074 { 1075 CompareState *s = COLO_COMPARE(obj); 1076 1077 g_free(s->notify_dev); 1078 s->notify_dev = g_strdup(value); 1079 } 1080 1081 static void compare_get_timeout(Object *obj, Visitor *v, 1082 const char *name, void *opaque, 1083 Error **errp) 1084 { 1085 CompareState *s = COLO_COMPARE(obj); 1086 uint64_t value = s->compare_timeout; 1087 1088 visit_type_uint64(v, name, &value, errp); 1089 } 1090 1091 static void compare_set_timeout(Object *obj, Visitor *v, 1092 const char *name, void *opaque, 1093 Error **errp) 1094 { 1095 CompareState *s = COLO_COMPARE(obj); 1096 uint32_t value; 1097 1098 if (!visit_type_uint32(v, name, &value, errp)) { 1099 return; 1100 } 1101 if (!value) { 1102 error_setg(errp, "Property '%s.%s' requires a positive value", 1103 object_get_typename(obj), name); 1104 return; 1105 } 1106 s->compare_timeout = value; 1107 } 1108 1109 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1110 const char *name, void *opaque, 1111 Error **errp) 1112 { 1113 CompareState *s = COLO_COMPARE(obj); 1114 uint32_t value = s->expired_scan_cycle; 1115 1116 visit_type_uint32(v, name, &value, errp); 1117 } 1118 1119 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1120 const char *name, void *opaque, 1121 Error **errp) 1122 { 1123 CompareState *s = COLO_COMPARE(obj); 1124 uint32_t value; 1125 1126 if (!visit_type_uint32(v, name, &value, errp)) { 1127 return; 1128 } 1129 if (!value) { 1130 error_setg(errp, "Property '%s.%s' requires a positive value", 1131 object_get_typename(obj), name); 1132 return; 1133 } 1134 s->expired_scan_cycle = value; 1135 } 1136 1137 static void get_max_queue_size(Object *obj, Visitor *v, 1138 const char *name, void *opaque, 1139 Error **errp) 1140 { 1141 uint32_t value = max_queue_size; 1142 1143 visit_type_uint32(v, name, &value, errp); 1144 } 1145 1146 static void set_max_queue_size(Object *obj, Visitor *v, 1147 const char *name, void *opaque, 1148 Error **errp) 1149 { 1150 Error *local_err = NULL; 1151 uint64_t value; 1152 1153 visit_type_uint64(v, name, &value, &local_err); 1154 if (local_err) { 1155 goto out; 1156 } 1157 if (!value) { 1158 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1159 object_get_typename(obj), name); 1160 goto out; 1161 } 1162 max_queue_size = value; 1163 1164 out: 1165 error_propagate(errp, local_err); 1166 } 1167 1168 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1169 { 1170 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1171 Connection *conn = NULL; 1172 1173 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1174 trace_colo_compare_main("primary: unsupported packet in"); 1175 compare_chr_send(s, 1176 pri_rs->buf, 1177 pri_rs->packet_len, 1178 pri_rs->vnet_hdr_len, 1179 false, 1180 false); 1181 } else { 1182 /* compare packet in the specified connection */ 1183 colo_compare_connection(conn, s); 1184 } 1185 } 1186 1187 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1188 { 1189 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1190 Connection *conn = NULL; 1191 1192 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1193 trace_colo_compare_main("secondary: unsupported packet in"); 1194 } else { 1195 /* compare packet in the specified connection */ 1196 colo_compare_connection(conn, s); 1197 } 1198 } 1199 1200 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1201 { 1202 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1203 1204 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1205 int ret; 1206 1207 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1208 notify_rs->buf, 1209 notify_rs->packet_len)) { 1210 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1211 if (ret < 0) { 1212 error_report("Notify Xen COLO-frame INIT failed"); 1213 } 1214 } else if (packet_matches_str("COLO_CHECKPOINT", 1215 notify_rs->buf, 1216 notify_rs->packet_len)) { 1217 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1218 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1219 } else { 1220 error_report("COLO compare got unsupported instruction"); 1221 } 1222 } 1223 1224 /* 1225 * Return 0 is success. 1226 * Return 1 is failed. 1227 */ 1228 static int find_and_check_chardev(Chardev **chr, 1229 char *chr_name, 1230 Error **errp) 1231 { 1232 *chr = qemu_chr_find(chr_name); 1233 if (*chr == NULL) { 1234 error_setg(errp, "Device '%s' not found", 1235 chr_name); 1236 return 1; 1237 } 1238 1239 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1240 error_setg(errp, "chardev \"%s\" is not reconnectable", 1241 chr_name); 1242 return 1; 1243 } 1244 1245 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1246 error_setg(errp, "chardev \"%s\" cannot switch context", 1247 chr_name); 1248 return 1; 1249 } 1250 1251 return 0; 1252 } 1253 1254 /* 1255 * Called from the main thread on the primary 1256 * to setup colo-compare. 1257 */ 1258 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1259 { 1260 CompareState *s = COLO_COMPARE(uc); 1261 Chardev *chr; 1262 1263 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1264 error_setg(errp, "colo compare needs 'primary_in' ," 1265 "'secondary_in','outdev','iothread' property set"); 1266 return; 1267 } else if (!strcmp(s->pri_indev, s->outdev) || 1268 !strcmp(s->sec_indev, s->outdev) || 1269 !strcmp(s->pri_indev, s->sec_indev)) { 1270 error_setg(errp, "'indev' and 'outdev' could not be same " 1271 "for compare module"); 1272 return; 1273 } 1274 1275 if (!s->compare_timeout) { 1276 /* Set default value to 3000 MS */ 1277 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1278 } 1279 1280 if (!s->expired_scan_cycle) { 1281 /* Set default value to 3000 MS */ 1282 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1283 } 1284 1285 if (!max_queue_size) { 1286 /* Set default queue size to 1024 */ 1287 max_queue_size = MAX_QUEUE_SIZE; 1288 } 1289 1290 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1291 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1292 return; 1293 } 1294 1295 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1296 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1297 return; 1298 } 1299 1300 if (find_and_check_chardev(&chr, s->outdev, errp) || 1301 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1302 return; 1303 } 1304 1305 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1306 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1307 1308 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1309 if (s->notify_dev) { 1310 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1311 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1312 return; 1313 } 1314 1315 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1316 s->vnet_hdr); 1317 } 1318 1319 s->out_sendco.s = s; 1320 s->out_sendco.chr = &s->chr_out; 1321 s->out_sendco.notify_remote_frame = false; 1322 s->out_sendco.done = true; 1323 g_queue_init(&s->out_sendco.send_list); 1324 1325 if (s->notify_dev) { 1326 s->notify_sendco.s = s; 1327 s->notify_sendco.chr = &s->chr_notify_dev; 1328 s->notify_sendco.notify_remote_frame = true; 1329 s->notify_sendco.done = true; 1330 g_queue_init(&s->notify_sendco.send_list); 1331 } 1332 1333 g_queue_init(&s->conn_list); 1334 1335 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1336 connection_key_equal, 1337 g_free, 1338 connection_destroy); 1339 1340 colo_compare_iothread(s); 1341 1342 qemu_mutex_lock(&colo_compare_mutex); 1343 if (!colo_compare_active) { 1344 qemu_mutex_init(&event_mtx); 1345 qemu_cond_init(&event_complete_cond); 1346 colo_compare_active = true; 1347 } 1348 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1349 qemu_mutex_unlock(&colo_compare_mutex); 1350 1351 return; 1352 } 1353 1354 static void colo_flush_packets(void *opaque, void *user_data) 1355 { 1356 CompareState *s = user_data; 1357 Connection *conn = opaque; 1358 Packet *pkt = NULL; 1359 1360 while (!g_queue_is_empty(&conn->primary_list)) { 1361 pkt = g_queue_pop_head(&conn->primary_list); 1362 compare_chr_send(s, 1363 pkt->data, 1364 pkt->size, 1365 pkt->vnet_hdr_len, 1366 false, 1367 true); 1368 packet_destroy_partial(pkt, NULL); 1369 } 1370 while (!g_queue_is_empty(&conn->secondary_list)) { 1371 pkt = g_queue_pop_head(&conn->secondary_list); 1372 packet_destroy(pkt, NULL); 1373 } 1374 } 1375 1376 static void colo_compare_class_init(ObjectClass *oc, void *data) 1377 { 1378 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1379 1380 ucc->complete = colo_compare_complete; 1381 } 1382 1383 static void colo_compare_init(Object *obj) 1384 { 1385 CompareState *s = COLO_COMPARE(obj); 1386 1387 object_property_add_str(obj, "primary_in", 1388 compare_get_pri_indev, compare_set_pri_indev); 1389 object_property_add_str(obj, "secondary_in", 1390 compare_get_sec_indev, compare_set_sec_indev); 1391 object_property_add_str(obj, "outdev", 1392 compare_get_outdev, compare_set_outdev); 1393 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1394 (Object **)&s->iothread, 1395 object_property_allow_set_link, 1396 OBJ_PROP_LINK_STRONG); 1397 /* This parameter just for Xen COLO */ 1398 object_property_add_str(obj, "notify_dev", 1399 compare_get_notify_dev, compare_set_notify_dev); 1400 1401 object_property_add(obj, "compare_timeout", "uint64", 1402 compare_get_timeout, 1403 compare_set_timeout, NULL, NULL); 1404 1405 object_property_add(obj, "expired_scan_cycle", "uint32", 1406 compare_get_expired_scan_cycle, 1407 compare_set_expired_scan_cycle, NULL, NULL); 1408 1409 object_property_add(obj, "max_queue_size", "uint32", 1410 get_max_queue_size, 1411 set_max_queue_size, NULL, NULL); 1412 1413 s->vnet_hdr = false; 1414 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1415 compare_set_vnet_hdr); 1416 } 1417 1418 static void colo_compare_finalize(Object *obj) 1419 { 1420 CompareState *s = COLO_COMPARE(obj); 1421 CompareState *tmp = NULL; 1422 1423 qemu_mutex_lock(&colo_compare_mutex); 1424 QTAILQ_FOREACH(tmp, &net_compares, next) { 1425 if (tmp == s) { 1426 QTAILQ_REMOVE(&net_compares, s, next); 1427 break; 1428 } 1429 } 1430 if (QTAILQ_EMPTY(&net_compares)) { 1431 colo_compare_active = false; 1432 qemu_mutex_destroy(&event_mtx); 1433 qemu_cond_destroy(&event_complete_cond); 1434 } 1435 qemu_mutex_unlock(&colo_compare_mutex); 1436 1437 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1438 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1439 qemu_chr_fe_deinit(&s->chr_out, false); 1440 if (s->notify_dev) { 1441 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1442 } 1443 1444 colo_compare_timer_del(s); 1445 1446 qemu_bh_delete(s->event_bh); 1447 1448 AioContext *ctx = iothread_get_aio_context(s->iothread); 1449 aio_context_acquire(ctx); 1450 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1451 if (s->notify_dev) { 1452 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1453 } 1454 aio_context_release(ctx); 1455 1456 /* Release all unhandled packets after compare thead exited */ 1457 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1458 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1459 1460 g_queue_clear(&s->conn_list); 1461 g_queue_clear(&s->out_sendco.send_list); 1462 if (s->notify_dev) { 1463 g_queue_clear(&s->notify_sendco.send_list); 1464 } 1465 1466 if (s->connection_track_table) { 1467 g_hash_table_destroy(s->connection_track_table); 1468 } 1469 1470 object_unref(OBJECT(s->iothread)); 1471 1472 g_free(s->pri_indev); 1473 g_free(s->sec_indev); 1474 g_free(s->outdev); 1475 g_free(s->notify_dev); 1476 } 1477 1478 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1479 { 1480 colo_compare_active = false; 1481 qemu_mutex_init(&colo_compare_mutex); 1482 } 1483 1484 static const TypeInfo colo_compare_info = { 1485 .name = TYPE_COLO_COMPARE, 1486 .parent = TYPE_OBJECT, 1487 .instance_size = sizeof(CompareState), 1488 .instance_init = colo_compare_init, 1489 .instance_finalize = colo_compare_finalize, 1490 .class_size = sizeof(CompareClass), 1491 .class_init = colo_compare_class_init, 1492 .interfaces = (InterfaceInfo[]) { 1493 { TYPE_USER_CREATABLE }, 1494 { } 1495 } 1496 }; 1497 1498 static void register_types(void) 1499 { 1500 type_register_static(&colo_compare_info); 1501 } 1502 1503 type_init(register_types); 1504