1 /* 2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO) 3 * (a.k.a. Fault Tolerance or Continuous Replication) 4 * 5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 6 * Copyright (c) 2016 FUJITSU LIMITED 7 * Copyright (c) 2016 Intel Corporation 8 * 9 * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or 12 * later. See the COPYING file in the top-level directory. 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu-common.h" 17 #include "qemu/error-report.h" 18 #include "trace.h" 19 #include "qapi/error.h" 20 #include "net/net.h" 21 #include "net/eth.h" 22 #include "qom/object_interfaces.h" 23 #include "qemu/iov.h" 24 #include "qom/object.h" 25 #include "net/queue.h" 26 #include "chardev/char-fe.h" 27 #include "qemu/sockets.h" 28 #include "colo.h" 29 #include "sysemu/iothread.h" 30 #include "net/colo-compare.h" 31 #include "migration/colo.h" 32 #include "migration/migration.h" 33 #include "util.h" 34 35 #include "block/aio-wait.h" 36 #include "qemu/coroutine.h" 37 38 #define TYPE_COLO_COMPARE "colo-compare" 39 typedef struct CompareState CompareState; 40 DECLARE_INSTANCE_CHECKER(CompareState, COLO_COMPARE, 41 TYPE_COLO_COMPARE) 42 43 static QTAILQ_HEAD(, CompareState) net_compares = 44 QTAILQ_HEAD_INITIALIZER(net_compares); 45 46 static NotifierList colo_compare_notifiers = 47 NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers); 48 49 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 50 #define MAX_QUEUE_SIZE 1024 51 52 #define COLO_COMPARE_FREE_PRIMARY 0x01 53 #define COLO_COMPARE_FREE_SECONDARY 0x02 54 55 #define REGULAR_PACKET_CHECK_MS 3000 56 #define DEFAULT_TIME_OUT_MS 3000 57 58 /* #define DEBUG_COLO_PACKETS */ 59 60 static QemuMutex colo_compare_mutex; 61 static bool colo_compare_active; 62 static QemuMutex event_mtx; 63 static QemuCond event_complete_cond; 64 static int event_unhandled_count; 65 static uint32_t max_queue_size; 66 67 /* 68 * + CompareState ++ 69 * | | 70 * +---------------+ +---------------+ +---------------+ 71 * | conn list + - > conn + ------- > conn + -- > ...... 72 * +---------------+ +---------------+ +---------------+ 73 * | | | | | | 74 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 75 * |primary | |secondary |primary | |secondary 76 * |packet | |packet + |packet | |packet + 77 * +--------+ +--------+ +--------+ +--------+ 78 * | | | | 79 * +---v----+ +---v----+ +---v----+ +---v----+ 80 * |primary | |secondary |primary | |secondary 81 * |packet | |packet + |packet | |packet + 82 * +--------+ +--------+ +--------+ +--------+ 83 * | | | | 84 * +---v----+ +---v----+ +---v----+ +---v----+ 85 * |primary | |secondary |primary | |secondary 86 * |packet | |packet + |packet | |packet + 87 * +--------+ +--------+ +--------+ +--------+ 88 */ 89 90 typedef struct SendCo { 91 Coroutine *co; 92 struct CompareState *s; 93 CharBackend *chr; 94 GQueue send_list; 95 bool notify_remote_frame; 96 bool done; 97 int ret; 98 } SendCo; 99 100 typedef struct SendEntry { 101 uint32_t size; 102 uint32_t vnet_hdr_len; 103 uint8_t *buf; 104 } SendEntry; 105 106 struct CompareState { 107 Object parent; 108 109 char *pri_indev; 110 char *sec_indev; 111 char *outdev; 112 char *notify_dev; 113 CharBackend chr_pri_in; 114 CharBackend chr_sec_in; 115 CharBackend chr_out; 116 CharBackend chr_notify_dev; 117 SocketReadState pri_rs; 118 SocketReadState sec_rs; 119 SocketReadState notify_rs; 120 SendCo out_sendco; 121 SendCo notify_sendco; 122 bool vnet_hdr; 123 uint32_t compare_timeout; 124 uint32_t expired_scan_cycle; 125 126 /* 127 * Record the connection that through the NIC 128 * Element type: Connection 129 */ 130 GQueue conn_list; 131 /* Record the connection without repetition */ 132 GHashTable *connection_track_table; 133 134 IOThread *iothread; 135 GMainContext *worker_context; 136 QEMUTimer *packet_check_timer; 137 138 QEMUBH *event_bh; 139 enum colo_event event; 140 141 QTAILQ_ENTRY(CompareState) next; 142 }; 143 144 typedef struct CompareClass { 145 ObjectClass parent_class; 146 } CompareClass; 147 148 enum { 149 PRIMARY_IN = 0, 150 SECONDARY_IN, 151 }; 152 153 static const char *colo_mode[] = { 154 [PRIMARY_IN] = "primary", 155 [SECONDARY_IN] = "secondary", 156 }; 157 158 static int compare_chr_send(CompareState *s, 159 uint8_t *buf, 160 uint32_t size, 161 uint32_t vnet_hdr_len, 162 bool notify_remote_frame, 163 bool zero_copy); 164 165 static bool packet_matches_str(const char *str, 166 const uint8_t *buf, 167 uint32_t packet_len) 168 { 169 if (packet_len != strlen(str)) { 170 return false; 171 } 172 173 return !memcmp(str, buf, strlen(str)); 174 } 175 176 static void notify_remote_frame(CompareState *s) 177 { 178 char msg[] = "DO_CHECKPOINT"; 179 int ret = 0; 180 181 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 182 if (ret < 0) { 183 error_report("Notify Xen COLO-frame failed"); 184 } 185 } 186 187 static void colo_compare_inconsistency_notify(CompareState *s) 188 { 189 if (s->notify_dev) { 190 notify_remote_frame(s); 191 } else { 192 notifier_list_notify(&colo_compare_notifiers, 193 migrate_get_current()); 194 } 195 } 196 197 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 198 { 199 struct tcp_hdr *atcp, *btcp; 200 201 atcp = (struct tcp_hdr *)(a->transport_header); 202 btcp = (struct tcp_hdr *)(b->transport_header); 203 return ntohl(atcp->th_seq) - ntohl(btcp->th_seq); 204 } 205 206 static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) 207 { 208 Packet *pkt = data; 209 struct tcp_hdr *tcphd; 210 211 tcphd = (struct tcp_hdr *)pkt->transport_header; 212 213 pkt->tcp_seq = ntohl(tcphd->th_seq); 214 pkt->tcp_ack = ntohl(tcphd->th_ack); 215 *max_ack = *max_ack > pkt->tcp_ack ? *max_ack : pkt->tcp_ack; 216 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 217 + (tcphd->th_off << 2) - pkt->vnet_hdr_len; 218 pkt->payload_size = pkt->size - pkt->header_size; 219 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 220 pkt->flags = tcphd->th_flags; 221 } 222 223 /* 224 * Return 1 on success, if return 0 means the 225 * packet will be dropped 226 */ 227 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 228 { 229 if (g_queue_get_length(queue) <= max_queue_size) { 230 if (pkt->ip->ip_p == IPPROTO_TCP) { 231 fill_pkt_tcp_info(pkt, max_ack); 232 g_queue_insert_sorted(queue, 233 pkt, 234 (GCompareDataFunc)seq_sorter, 235 NULL); 236 } else { 237 g_queue_push_tail(queue, pkt); 238 } 239 return 1; 240 } 241 return 0; 242 } 243 244 /* 245 * Return 0 on success, if return -1 means the pkt 246 * is unsupported(arp and ipv6) and will be sent later 247 */ 248 static int packet_enqueue(CompareState *s, int mode, Connection **con) 249 { 250 ConnectionKey key; 251 Packet *pkt = NULL; 252 Connection *conn; 253 int ret; 254 255 if (mode == PRIMARY_IN) { 256 pkt = packet_new(s->pri_rs.buf, 257 s->pri_rs.packet_len, 258 s->pri_rs.vnet_hdr_len); 259 } else { 260 pkt = packet_new(s->sec_rs.buf, 261 s->sec_rs.packet_len, 262 s->sec_rs.vnet_hdr_len); 263 } 264 265 if (parse_packet_early(pkt)) { 266 packet_destroy(pkt, NULL); 267 pkt = NULL; 268 return -1; 269 } 270 fill_connection_key(pkt, &key); 271 272 conn = connection_get(s->connection_track_table, 273 &key, 274 &s->conn_list); 275 276 if (!conn->processing) { 277 g_queue_push_tail(&s->conn_list, conn); 278 conn->processing = true; 279 } 280 281 if (mode == PRIMARY_IN) { 282 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 283 } else { 284 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 285 } 286 287 if (!ret) { 288 trace_colo_compare_drop_packet(colo_mode[mode], 289 "queue size too big, drop packet"); 290 packet_destroy(pkt, NULL); 291 pkt = NULL; 292 } 293 294 *con = conn; 295 296 return 0; 297 } 298 299 static inline bool after(uint32_t seq1, uint32_t seq2) 300 { 301 return (int32_t)(seq1 - seq2) > 0; 302 } 303 304 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 305 { 306 int ret; 307 ret = compare_chr_send(s, 308 pkt->data, 309 pkt->size, 310 pkt->vnet_hdr_len, 311 false, 312 true); 313 if (ret < 0) { 314 error_report("colo send primary packet failed"); 315 } 316 trace_colo_compare_main("packet same and release packet"); 317 packet_destroy_partial(pkt, NULL); 318 } 319 320 /* 321 * The IP packets sent by primary and secondary 322 * will be compared in here 323 * TODO support ip fragment, Out-Of-Order 324 * return: 0 means packet same 325 * > 0 || < 0 means packet different 326 */ 327 static int colo_compare_packet_payload(Packet *ppkt, 328 Packet *spkt, 329 uint16_t poffset, 330 uint16_t soffset, 331 uint16_t len) 332 333 { 334 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 335 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 336 337 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 338 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 339 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 340 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 341 342 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 343 pri_ip_dst, spkt->size, 344 sec_ip_src, sec_ip_dst); 345 } 346 347 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 348 } 349 350 /* 351 * return true means that the payload is consist and 352 * need to make the next comparison, false means do 353 * the checkpoint 354 */ 355 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 356 int8_t *mark, uint32_t max_ack) 357 { 358 *mark = 0; 359 360 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 361 if (!colo_compare_packet_payload(ppkt, spkt, 362 ppkt->header_size, spkt->header_size, 363 ppkt->payload_size)) { 364 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 365 return true; 366 } 367 } 368 369 /* one part of secondary packet payload still need to be compared */ 370 if (!after(ppkt->seq_end, spkt->seq_end)) { 371 if (!colo_compare_packet_payload(ppkt, spkt, 372 ppkt->header_size + ppkt->offset, 373 spkt->header_size + spkt->offset, 374 ppkt->payload_size - ppkt->offset)) { 375 if (!after(ppkt->tcp_ack, max_ack)) { 376 *mark = COLO_COMPARE_FREE_PRIMARY; 377 spkt->offset += ppkt->payload_size - ppkt->offset; 378 return true; 379 } else { 380 /* secondary guest hasn't ack the data, don't send 381 * out this packet 382 */ 383 return false; 384 } 385 } 386 } else { 387 /* primary packet is longer than secondary packet, compare 388 * the same part and mark the primary packet offset 389 */ 390 if (!colo_compare_packet_payload(ppkt, spkt, 391 ppkt->header_size + ppkt->offset, 392 spkt->header_size + spkt->offset, 393 spkt->payload_size - spkt->offset)) { 394 *mark = COLO_COMPARE_FREE_SECONDARY; 395 ppkt->offset += spkt->payload_size - spkt->offset; 396 return true; 397 } 398 } 399 400 return false; 401 } 402 403 static void colo_compare_tcp(CompareState *s, Connection *conn) 404 { 405 Packet *ppkt = NULL, *spkt = NULL; 406 int8_t mark; 407 408 /* 409 * If ppkt and spkt have the same payload, but ppkt's ACK 410 * is greater than spkt's ACK, in this case we can not 411 * send the ppkt because it will cause the secondary guest 412 * to miss sending some data in the next. Therefore, we 413 * record the maximum ACK in the current queue at both 414 * primary side and secondary side. Only when the ack is 415 * less than the smaller of the two maximum ack, then we 416 * can ensure that the packet's payload is acknowledged by 417 * primary and secondary. 418 */ 419 uint32_t min_ack = conn->pack > conn->sack ? conn->sack : conn->pack; 420 421 pri: 422 if (g_queue_is_empty(&conn->primary_list)) { 423 return; 424 } 425 ppkt = g_queue_pop_head(&conn->primary_list); 426 sec: 427 if (g_queue_is_empty(&conn->secondary_list)) { 428 g_queue_push_head(&conn->primary_list, ppkt); 429 return; 430 } 431 spkt = g_queue_pop_head(&conn->secondary_list); 432 433 if (ppkt->tcp_seq == ppkt->seq_end) { 434 colo_release_primary_pkt(s, ppkt); 435 ppkt = NULL; 436 } 437 438 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 439 trace_colo_compare_main("pri: this packet has compared"); 440 colo_release_primary_pkt(s, ppkt); 441 ppkt = NULL; 442 } 443 444 if (spkt->tcp_seq == spkt->seq_end) { 445 packet_destroy(spkt, NULL); 446 if (!ppkt) { 447 goto pri; 448 } else { 449 goto sec; 450 } 451 } else { 452 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 453 trace_colo_compare_main("sec: this packet has compared"); 454 packet_destroy(spkt, NULL); 455 if (!ppkt) { 456 goto pri; 457 } else { 458 goto sec; 459 } 460 } 461 if (!ppkt) { 462 g_queue_push_head(&conn->secondary_list, spkt); 463 goto pri; 464 } 465 } 466 467 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 468 trace_colo_compare_tcp_info("pri", 469 ppkt->tcp_seq, ppkt->tcp_ack, 470 ppkt->header_size, ppkt->payload_size, 471 ppkt->offset, ppkt->flags); 472 473 trace_colo_compare_tcp_info("sec", 474 spkt->tcp_seq, spkt->tcp_ack, 475 spkt->header_size, spkt->payload_size, 476 spkt->offset, spkt->flags); 477 478 if (mark == COLO_COMPARE_FREE_PRIMARY) { 479 conn->compare_seq = ppkt->seq_end; 480 colo_release_primary_pkt(s, ppkt); 481 g_queue_push_head(&conn->secondary_list, spkt); 482 goto pri; 483 } 484 if (mark == COLO_COMPARE_FREE_SECONDARY) { 485 conn->compare_seq = spkt->seq_end; 486 packet_destroy(spkt, NULL); 487 goto sec; 488 } 489 if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 490 conn->compare_seq = ppkt->seq_end; 491 colo_release_primary_pkt(s, ppkt); 492 packet_destroy(spkt, NULL); 493 goto pri; 494 } 495 } else { 496 g_queue_push_head(&conn->primary_list, ppkt); 497 g_queue_push_head(&conn->secondary_list, spkt); 498 499 #ifdef DEBUG_COLO_PACKETS 500 qemu_hexdump((char *)ppkt->data, stderr, 501 "colo-compare ppkt", ppkt->size); 502 qemu_hexdump((char *)spkt->data, stderr, 503 "colo-compare spkt", spkt->size); 504 #endif 505 506 colo_compare_inconsistency_notify(s); 507 } 508 } 509 510 511 /* 512 * Called from the compare thread on the primary 513 * for compare udp packet 514 */ 515 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 516 { 517 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 518 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 519 520 trace_colo_compare_main("compare udp"); 521 522 /* 523 * Because of ppkt and spkt are both in the same connection, 524 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 525 * same with spkt. In addition, IP header's Identification is a random 526 * field, we can handle it in IP fragmentation function later. 527 * COLO just concern the response net packet payload from primary guest 528 * and secondary guest are same or not, So we ignored all IP header include 529 * other field like TOS,TTL,IP Checksum. we only need to compare 530 * the ip payload here. 531 */ 532 if (ppkt->size != spkt->size) { 533 trace_colo_compare_main("UDP: payload size of packets are different"); 534 return -1; 535 } 536 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 537 ppkt->size - offset)) { 538 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 539 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 540 #ifdef DEBUG_COLO_PACKETS 541 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 542 ppkt->size); 543 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 544 spkt->size); 545 #endif 546 return -1; 547 } else { 548 return 0; 549 } 550 } 551 552 /* 553 * Called from the compare thread on the primary 554 * for compare icmp packet 555 */ 556 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 557 { 558 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 559 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 560 561 trace_colo_compare_main("compare icmp"); 562 563 /* 564 * Because of ppkt and spkt are both in the same connection, 565 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 566 * same with spkt. In addition, IP header's Identification is a random 567 * field, we can handle it in IP fragmentation function later. 568 * COLO just concern the response net packet payload from primary guest 569 * and secondary guest are same or not, So we ignored all IP header include 570 * other field like TOS,TTL,IP Checksum. we only need to compare 571 * the ip payload here. 572 */ 573 if (ppkt->size != spkt->size) { 574 trace_colo_compare_main("ICMP: payload size of packets are different"); 575 return -1; 576 } 577 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 578 ppkt->size - offset)) { 579 trace_colo_compare_icmp_miscompare("primary pkt size", 580 ppkt->size); 581 trace_colo_compare_icmp_miscompare("Secondary pkt size", 582 spkt->size); 583 #ifdef DEBUG_COLO_PACKETS 584 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 585 ppkt->size); 586 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 587 spkt->size); 588 #endif 589 return -1; 590 } else { 591 return 0; 592 } 593 } 594 595 /* 596 * Called from the compare thread on the primary 597 * for compare other packet 598 */ 599 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 600 { 601 uint16_t offset = ppkt->vnet_hdr_len; 602 603 trace_colo_compare_main("compare other"); 604 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 605 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 606 607 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 608 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 609 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 610 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 611 612 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 613 pri_ip_dst, spkt->size, 614 sec_ip_src, sec_ip_dst); 615 } 616 617 if (ppkt->size != spkt->size) { 618 trace_colo_compare_main("Other: payload size of packets are different"); 619 return -1; 620 } 621 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 622 ppkt->size - offset); 623 } 624 625 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 626 { 627 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 628 629 if ((now - pkt->creation_ms) > (*check_time)) { 630 trace_colo_old_packet_check_found(pkt->creation_ms); 631 return 0; 632 } else { 633 return 1; 634 } 635 } 636 637 void colo_compare_register_notifier(Notifier *notify) 638 { 639 notifier_list_add(&colo_compare_notifiers, notify); 640 } 641 642 void colo_compare_unregister_notifier(Notifier *notify) 643 { 644 notifier_remove(notify); 645 } 646 647 static int colo_old_packet_check_one_conn(Connection *conn, 648 CompareState *s) 649 { 650 GList *result = NULL; 651 652 result = g_queue_find_custom(&conn->primary_list, 653 &s->compare_timeout, 654 (GCompareFunc)colo_old_packet_check_one); 655 656 if (result) { 657 /* Do checkpoint will flush old packet */ 658 colo_compare_inconsistency_notify(s); 659 return 0; 660 } 661 662 return 1; 663 } 664 665 /* 666 * Look for old packets that the secondary hasn't matched, 667 * if we have some then we have to checkpoint to wake 668 * the secondary up. 669 */ 670 static void colo_old_packet_check(void *opaque) 671 { 672 CompareState *s = opaque; 673 674 /* 675 * If we find one old packet, stop finding job and notify 676 * COLO frame do checkpoint. 677 */ 678 g_queue_find_custom(&s->conn_list, s, 679 (GCompareFunc)colo_old_packet_check_one_conn); 680 } 681 682 static void colo_compare_packet(CompareState *s, Connection *conn, 683 int (*HandlePacket)(Packet *spkt, 684 Packet *ppkt)) 685 { 686 Packet *pkt = NULL; 687 GList *result = NULL; 688 689 while (!g_queue_is_empty(&conn->primary_list) && 690 !g_queue_is_empty(&conn->secondary_list)) { 691 pkt = g_queue_pop_head(&conn->primary_list); 692 result = g_queue_find_custom(&conn->secondary_list, 693 pkt, (GCompareFunc)HandlePacket); 694 695 if (result) { 696 colo_release_primary_pkt(s, pkt); 697 g_queue_remove(&conn->secondary_list, result->data); 698 } else { 699 /* 700 * If one packet arrive late, the secondary_list or 701 * primary_list will be empty, so we can't compare it 702 * until next comparison. If the packets in the list are 703 * timeout, it will trigger a checkpoint request. 704 */ 705 trace_colo_compare_main("packet different"); 706 g_queue_push_head(&conn->primary_list, pkt); 707 708 colo_compare_inconsistency_notify(s); 709 break; 710 } 711 } 712 } 713 714 /* 715 * Called from the compare thread on the primary 716 * for compare packet with secondary list of the 717 * specified connection when a new packet was 718 * queued to it. 719 */ 720 static void colo_compare_connection(void *opaque, void *user_data) 721 { 722 CompareState *s = user_data; 723 Connection *conn = opaque; 724 725 switch (conn->ip_proto) { 726 case IPPROTO_TCP: 727 colo_compare_tcp(s, conn); 728 break; 729 case IPPROTO_UDP: 730 colo_compare_packet(s, conn, colo_packet_compare_udp); 731 break; 732 case IPPROTO_ICMP: 733 colo_compare_packet(s, conn, colo_packet_compare_icmp); 734 break; 735 default: 736 colo_compare_packet(s, conn, colo_packet_compare_other); 737 break; 738 } 739 } 740 741 static void coroutine_fn _compare_chr_send(void *opaque) 742 { 743 SendCo *sendco = opaque; 744 CompareState *s = sendco->s; 745 int ret = 0; 746 747 while (!g_queue_is_empty(&sendco->send_list)) { 748 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 749 uint32_t len = htonl(entry->size); 750 751 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 752 753 if (ret != sizeof(len)) { 754 g_free(entry->buf); 755 g_slice_free(SendEntry, entry); 756 goto err; 757 } 758 759 if (!sendco->notify_remote_frame && s->vnet_hdr) { 760 /* 761 * We send vnet header len make other module(like filter-redirector) 762 * know how to parse net packet correctly. 763 */ 764 len = htonl(entry->vnet_hdr_len); 765 766 ret = qemu_chr_fe_write_all(sendco->chr, 767 (uint8_t *)&len, 768 sizeof(len)); 769 770 if (ret != sizeof(len)) { 771 g_free(entry->buf); 772 g_slice_free(SendEntry, entry); 773 goto err; 774 } 775 } 776 777 ret = qemu_chr_fe_write_all(sendco->chr, 778 (uint8_t *)entry->buf, 779 entry->size); 780 781 if (ret != entry->size) { 782 g_free(entry->buf); 783 g_slice_free(SendEntry, entry); 784 goto err; 785 } 786 787 g_free(entry->buf); 788 g_slice_free(SendEntry, entry); 789 } 790 791 sendco->ret = 0; 792 goto out; 793 794 err: 795 while (!g_queue_is_empty(&sendco->send_list)) { 796 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 797 g_free(entry->buf); 798 g_slice_free(SendEntry, entry); 799 } 800 sendco->ret = ret < 0 ? ret : -EIO; 801 out: 802 sendco->co = NULL; 803 sendco->done = true; 804 aio_wait_kick(); 805 } 806 807 static int compare_chr_send(CompareState *s, 808 uint8_t *buf, 809 uint32_t size, 810 uint32_t vnet_hdr_len, 811 bool notify_remote_frame, 812 bool zero_copy) 813 { 814 SendCo *sendco; 815 SendEntry *entry; 816 817 if (notify_remote_frame) { 818 sendco = &s->notify_sendco; 819 } else { 820 sendco = &s->out_sendco; 821 } 822 823 if (!size) { 824 return 0; 825 } 826 827 entry = g_slice_new(SendEntry); 828 entry->size = size; 829 entry->vnet_hdr_len = vnet_hdr_len; 830 if (zero_copy) { 831 entry->buf = buf; 832 } else { 833 entry->buf = g_malloc(size); 834 memcpy(entry->buf, buf, size); 835 } 836 g_queue_push_head(&sendco->send_list, entry); 837 838 if (sendco->done) { 839 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 840 sendco->done = false; 841 qemu_coroutine_enter(sendco->co); 842 if (sendco->done) { 843 /* report early errors */ 844 return sendco->ret; 845 } 846 } 847 848 /* assume success */ 849 return 0; 850 } 851 852 static int compare_chr_can_read(void *opaque) 853 { 854 return COMPARE_READ_LEN_MAX; 855 } 856 857 /* 858 * Called from the main thread on the primary for packets 859 * arriving over the socket from the primary. 860 */ 861 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 862 { 863 CompareState *s = COLO_COMPARE(opaque); 864 int ret; 865 866 ret = net_fill_rstate(&s->pri_rs, buf, size); 867 if (ret == -1) { 868 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 869 NULL, NULL, true); 870 error_report("colo-compare primary_in error"); 871 } 872 } 873 874 /* 875 * Called from the main thread on the primary for packets 876 * arriving over the socket from the secondary. 877 */ 878 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 879 { 880 CompareState *s = COLO_COMPARE(opaque); 881 int ret; 882 883 ret = net_fill_rstate(&s->sec_rs, buf, size); 884 if (ret == -1) { 885 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 886 NULL, NULL, true); 887 error_report("colo-compare secondary_in error"); 888 } 889 } 890 891 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 892 { 893 CompareState *s = COLO_COMPARE(opaque); 894 int ret; 895 896 ret = net_fill_rstate(&s->notify_rs, buf, size); 897 if (ret == -1) { 898 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 899 NULL, NULL, true); 900 error_report("colo-compare notify_dev error"); 901 } 902 } 903 904 /* 905 * Check old packet regularly so it can watch for any packets 906 * that the secondary hasn't produced equivalents of. 907 */ 908 static void check_old_packet_regular(void *opaque) 909 { 910 CompareState *s = opaque; 911 912 /* if have old packet we will notify checkpoint */ 913 colo_old_packet_check(s); 914 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 915 s->expired_scan_cycle); 916 } 917 918 /* Public API, Used for COLO frame to notify compare event */ 919 void colo_notify_compares_event(void *opaque, int event, Error **errp) 920 { 921 CompareState *s; 922 qemu_mutex_lock(&colo_compare_mutex); 923 924 if (!colo_compare_active) { 925 qemu_mutex_unlock(&colo_compare_mutex); 926 return; 927 } 928 929 qemu_mutex_lock(&event_mtx); 930 QTAILQ_FOREACH(s, &net_compares, next) { 931 s->event = event; 932 qemu_bh_schedule(s->event_bh); 933 event_unhandled_count++; 934 } 935 /* Wait all compare threads to finish handling this event */ 936 while (event_unhandled_count > 0) { 937 qemu_cond_wait(&event_complete_cond, &event_mtx); 938 } 939 940 qemu_mutex_unlock(&event_mtx); 941 qemu_mutex_unlock(&colo_compare_mutex); 942 } 943 944 static void colo_compare_timer_init(CompareState *s) 945 { 946 AioContext *ctx = iothread_get_aio_context(s->iothread); 947 948 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, 949 SCALE_MS, check_old_packet_regular, 950 s); 951 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 952 s->expired_scan_cycle); 953 } 954 955 static void colo_compare_timer_del(CompareState *s) 956 { 957 if (s->packet_check_timer) { 958 timer_del(s->packet_check_timer); 959 timer_free(s->packet_check_timer); 960 s->packet_check_timer = NULL; 961 } 962 } 963 964 static void colo_flush_packets(void *opaque, void *user_data); 965 966 static void colo_compare_handle_event(void *opaque) 967 { 968 CompareState *s = opaque; 969 970 switch (s->event) { 971 case COLO_EVENT_CHECKPOINT: 972 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 973 break; 974 case COLO_EVENT_FAILOVER: 975 break; 976 default: 977 break; 978 } 979 980 qemu_mutex_lock(&event_mtx); 981 assert(event_unhandled_count > 0); 982 event_unhandled_count--; 983 qemu_cond_broadcast(&event_complete_cond); 984 qemu_mutex_unlock(&event_mtx); 985 } 986 987 static void colo_compare_iothread(CompareState *s) 988 { 989 AioContext *ctx = iothread_get_aio_context(s->iothread); 990 object_ref(OBJECT(s->iothread)); 991 s->worker_context = iothread_get_g_main_context(s->iothread); 992 993 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 994 compare_pri_chr_in, NULL, NULL, 995 s, s->worker_context, true); 996 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 997 compare_sec_chr_in, NULL, NULL, 998 s, s->worker_context, true); 999 if (s->notify_dev) { 1000 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 1001 compare_notify_chr, NULL, NULL, 1002 s, s->worker_context, true); 1003 } 1004 1005 colo_compare_timer_init(s); 1006 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 1007 } 1008 1009 static char *compare_get_pri_indev(Object *obj, Error **errp) 1010 { 1011 CompareState *s = COLO_COMPARE(obj); 1012 1013 return g_strdup(s->pri_indev); 1014 } 1015 1016 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1017 { 1018 CompareState *s = COLO_COMPARE(obj); 1019 1020 g_free(s->pri_indev); 1021 s->pri_indev = g_strdup(value); 1022 } 1023 1024 static char *compare_get_sec_indev(Object *obj, Error **errp) 1025 { 1026 CompareState *s = COLO_COMPARE(obj); 1027 1028 return g_strdup(s->sec_indev); 1029 } 1030 1031 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1032 { 1033 CompareState *s = COLO_COMPARE(obj); 1034 1035 g_free(s->sec_indev); 1036 s->sec_indev = g_strdup(value); 1037 } 1038 1039 static char *compare_get_outdev(Object *obj, Error **errp) 1040 { 1041 CompareState *s = COLO_COMPARE(obj); 1042 1043 return g_strdup(s->outdev); 1044 } 1045 1046 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1047 { 1048 CompareState *s = COLO_COMPARE(obj); 1049 1050 g_free(s->outdev); 1051 s->outdev = g_strdup(value); 1052 } 1053 1054 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1055 { 1056 CompareState *s = COLO_COMPARE(obj); 1057 1058 return s->vnet_hdr; 1059 } 1060 1061 static void compare_set_vnet_hdr(Object *obj, 1062 bool value, 1063 Error **errp) 1064 { 1065 CompareState *s = COLO_COMPARE(obj); 1066 1067 s->vnet_hdr = value; 1068 } 1069 1070 static char *compare_get_notify_dev(Object *obj, Error **errp) 1071 { 1072 CompareState *s = COLO_COMPARE(obj); 1073 1074 return g_strdup(s->notify_dev); 1075 } 1076 1077 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1078 { 1079 CompareState *s = COLO_COMPARE(obj); 1080 1081 g_free(s->notify_dev); 1082 s->notify_dev = g_strdup(value); 1083 } 1084 1085 static void compare_get_timeout(Object *obj, Visitor *v, 1086 const char *name, void *opaque, 1087 Error **errp) 1088 { 1089 CompareState *s = COLO_COMPARE(obj); 1090 uint32_t value = s->compare_timeout; 1091 1092 visit_type_uint32(v, name, &value, errp); 1093 } 1094 1095 static void compare_set_timeout(Object *obj, Visitor *v, 1096 const char *name, void *opaque, 1097 Error **errp) 1098 { 1099 CompareState *s = COLO_COMPARE(obj); 1100 uint32_t value; 1101 1102 if (!visit_type_uint32(v, name, &value, errp)) { 1103 return; 1104 } 1105 if (!value) { 1106 error_setg(errp, "Property '%s.%s' requires a positive value", 1107 object_get_typename(obj), name); 1108 return; 1109 } 1110 s->compare_timeout = value; 1111 } 1112 1113 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1114 const char *name, void *opaque, 1115 Error **errp) 1116 { 1117 CompareState *s = COLO_COMPARE(obj); 1118 uint32_t value = s->expired_scan_cycle; 1119 1120 visit_type_uint32(v, name, &value, errp); 1121 } 1122 1123 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1124 const char *name, void *opaque, 1125 Error **errp) 1126 { 1127 CompareState *s = COLO_COMPARE(obj); 1128 uint32_t value; 1129 1130 if (!visit_type_uint32(v, name, &value, errp)) { 1131 return; 1132 } 1133 if (!value) { 1134 error_setg(errp, "Property '%s.%s' requires a positive value", 1135 object_get_typename(obj), name); 1136 return; 1137 } 1138 s->expired_scan_cycle = value; 1139 } 1140 1141 static void get_max_queue_size(Object *obj, Visitor *v, 1142 const char *name, void *opaque, 1143 Error **errp) 1144 { 1145 uint32_t value = max_queue_size; 1146 1147 visit_type_uint32(v, name, &value, errp); 1148 } 1149 1150 static void set_max_queue_size(Object *obj, Visitor *v, 1151 const char *name, void *opaque, 1152 Error **errp) 1153 { 1154 Error *local_err = NULL; 1155 uint32_t value; 1156 1157 visit_type_uint32(v, name, &value, &local_err); 1158 if (local_err) { 1159 goto out; 1160 } 1161 if (!value) { 1162 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1163 object_get_typename(obj), name); 1164 goto out; 1165 } 1166 max_queue_size = value; 1167 1168 out: 1169 error_propagate(errp, local_err); 1170 } 1171 1172 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1173 { 1174 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1175 Connection *conn = NULL; 1176 1177 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1178 trace_colo_compare_main("primary: unsupported packet in"); 1179 compare_chr_send(s, 1180 pri_rs->buf, 1181 pri_rs->packet_len, 1182 pri_rs->vnet_hdr_len, 1183 false, 1184 false); 1185 } else { 1186 /* compare packet in the specified connection */ 1187 colo_compare_connection(conn, s); 1188 } 1189 } 1190 1191 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1192 { 1193 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1194 Connection *conn = NULL; 1195 1196 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1197 trace_colo_compare_main("secondary: unsupported packet in"); 1198 } else { 1199 /* compare packet in the specified connection */ 1200 colo_compare_connection(conn, s); 1201 } 1202 } 1203 1204 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1205 { 1206 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1207 1208 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1209 int ret; 1210 1211 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1212 notify_rs->buf, 1213 notify_rs->packet_len)) { 1214 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1215 if (ret < 0) { 1216 error_report("Notify Xen COLO-frame INIT failed"); 1217 } 1218 } else if (packet_matches_str("COLO_CHECKPOINT", 1219 notify_rs->buf, 1220 notify_rs->packet_len)) { 1221 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1222 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1223 } else { 1224 error_report("COLO compare got unsupported instruction"); 1225 } 1226 } 1227 1228 /* 1229 * Return 0 is success. 1230 * Return 1 is failed. 1231 */ 1232 static int find_and_check_chardev(Chardev **chr, 1233 char *chr_name, 1234 Error **errp) 1235 { 1236 *chr = qemu_chr_find(chr_name); 1237 if (*chr == NULL) { 1238 error_setg(errp, "Device '%s' not found", 1239 chr_name); 1240 return 1; 1241 } 1242 1243 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1244 error_setg(errp, "chardev \"%s\" is not reconnectable", 1245 chr_name); 1246 return 1; 1247 } 1248 1249 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1250 error_setg(errp, "chardev \"%s\" cannot switch context", 1251 chr_name); 1252 return 1; 1253 } 1254 1255 return 0; 1256 } 1257 1258 /* 1259 * Called from the main thread on the primary 1260 * to setup colo-compare. 1261 */ 1262 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1263 { 1264 CompareState *s = COLO_COMPARE(uc); 1265 Chardev *chr; 1266 1267 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1268 error_setg(errp, "colo compare needs 'primary_in' ," 1269 "'secondary_in','outdev','iothread' property set"); 1270 return; 1271 } else if (!strcmp(s->pri_indev, s->outdev) || 1272 !strcmp(s->sec_indev, s->outdev) || 1273 !strcmp(s->pri_indev, s->sec_indev)) { 1274 error_setg(errp, "'indev' and 'outdev' could not be same " 1275 "for compare module"); 1276 return; 1277 } 1278 1279 if (!s->compare_timeout) { 1280 /* Set default value to 3000 MS */ 1281 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1282 } 1283 1284 if (!s->expired_scan_cycle) { 1285 /* Set default value to 3000 MS */ 1286 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1287 } 1288 1289 if (!max_queue_size) { 1290 /* Set default queue size to 1024 */ 1291 max_queue_size = MAX_QUEUE_SIZE; 1292 } 1293 1294 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1295 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1296 return; 1297 } 1298 1299 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1300 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1301 return; 1302 } 1303 1304 if (find_and_check_chardev(&chr, s->outdev, errp) || 1305 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1306 return; 1307 } 1308 1309 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1310 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1311 1312 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1313 if (s->notify_dev) { 1314 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1315 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1316 return; 1317 } 1318 1319 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1320 s->vnet_hdr); 1321 } 1322 1323 s->out_sendco.s = s; 1324 s->out_sendco.chr = &s->chr_out; 1325 s->out_sendco.notify_remote_frame = false; 1326 s->out_sendco.done = true; 1327 g_queue_init(&s->out_sendco.send_list); 1328 1329 if (s->notify_dev) { 1330 s->notify_sendco.s = s; 1331 s->notify_sendco.chr = &s->chr_notify_dev; 1332 s->notify_sendco.notify_remote_frame = true; 1333 s->notify_sendco.done = true; 1334 g_queue_init(&s->notify_sendco.send_list); 1335 } 1336 1337 g_queue_init(&s->conn_list); 1338 1339 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1340 connection_key_equal, 1341 g_free, 1342 connection_destroy); 1343 1344 colo_compare_iothread(s); 1345 1346 qemu_mutex_lock(&colo_compare_mutex); 1347 if (!colo_compare_active) { 1348 qemu_mutex_init(&event_mtx); 1349 qemu_cond_init(&event_complete_cond); 1350 colo_compare_active = true; 1351 } 1352 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1353 qemu_mutex_unlock(&colo_compare_mutex); 1354 1355 return; 1356 } 1357 1358 static void colo_flush_packets(void *opaque, void *user_data) 1359 { 1360 CompareState *s = user_data; 1361 Connection *conn = opaque; 1362 Packet *pkt = NULL; 1363 1364 while (!g_queue_is_empty(&conn->primary_list)) { 1365 pkt = g_queue_pop_head(&conn->primary_list); 1366 compare_chr_send(s, 1367 pkt->data, 1368 pkt->size, 1369 pkt->vnet_hdr_len, 1370 false, 1371 true); 1372 packet_destroy_partial(pkt, NULL); 1373 } 1374 while (!g_queue_is_empty(&conn->secondary_list)) { 1375 pkt = g_queue_pop_head(&conn->secondary_list); 1376 packet_destroy(pkt, NULL); 1377 } 1378 } 1379 1380 static void colo_compare_class_init(ObjectClass *oc, void *data) 1381 { 1382 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1383 1384 ucc->complete = colo_compare_complete; 1385 } 1386 1387 static void colo_compare_init(Object *obj) 1388 { 1389 CompareState *s = COLO_COMPARE(obj); 1390 1391 object_property_add_str(obj, "primary_in", 1392 compare_get_pri_indev, compare_set_pri_indev); 1393 object_property_add_str(obj, "secondary_in", 1394 compare_get_sec_indev, compare_set_sec_indev); 1395 object_property_add_str(obj, "outdev", 1396 compare_get_outdev, compare_set_outdev); 1397 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1398 (Object **)&s->iothread, 1399 object_property_allow_set_link, 1400 OBJ_PROP_LINK_STRONG); 1401 /* This parameter just for Xen COLO */ 1402 object_property_add_str(obj, "notify_dev", 1403 compare_get_notify_dev, compare_set_notify_dev); 1404 1405 object_property_add(obj, "compare_timeout", "uint32", 1406 compare_get_timeout, 1407 compare_set_timeout, NULL, NULL); 1408 1409 object_property_add(obj, "expired_scan_cycle", "uint32", 1410 compare_get_expired_scan_cycle, 1411 compare_set_expired_scan_cycle, NULL, NULL); 1412 1413 object_property_add(obj, "max_queue_size", "uint32", 1414 get_max_queue_size, 1415 set_max_queue_size, NULL, NULL); 1416 1417 s->vnet_hdr = false; 1418 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1419 compare_set_vnet_hdr); 1420 } 1421 1422 static void colo_compare_finalize(Object *obj) 1423 { 1424 CompareState *s = COLO_COMPARE(obj); 1425 CompareState *tmp = NULL; 1426 1427 qemu_mutex_lock(&colo_compare_mutex); 1428 QTAILQ_FOREACH(tmp, &net_compares, next) { 1429 if (tmp == s) { 1430 QTAILQ_REMOVE(&net_compares, s, next); 1431 break; 1432 } 1433 } 1434 if (QTAILQ_EMPTY(&net_compares)) { 1435 colo_compare_active = false; 1436 qemu_mutex_destroy(&event_mtx); 1437 qemu_cond_destroy(&event_complete_cond); 1438 } 1439 qemu_mutex_unlock(&colo_compare_mutex); 1440 1441 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1442 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1443 qemu_chr_fe_deinit(&s->chr_out, false); 1444 if (s->notify_dev) { 1445 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1446 } 1447 1448 colo_compare_timer_del(s); 1449 1450 qemu_bh_delete(s->event_bh); 1451 1452 AioContext *ctx = iothread_get_aio_context(s->iothread); 1453 aio_context_acquire(ctx); 1454 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1455 if (s->notify_dev) { 1456 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1457 } 1458 aio_context_release(ctx); 1459 1460 /* Release all unhandled packets after compare thead exited */ 1461 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1462 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1463 1464 g_queue_clear(&s->conn_list); 1465 g_queue_clear(&s->out_sendco.send_list); 1466 if (s->notify_dev) { 1467 g_queue_clear(&s->notify_sendco.send_list); 1468 } 1469 1470 if (s->connection_track_table) { 1471 g_hash_table_destroy(s->connection_track_table); 1472 } 1473 1474 object_unref(OBJECT(s->iothread)); 1475 1476 g_free(s->pri_indev); 1477 g_free(s->sec_indev); 1478 g_free(s->outdev); 1479 g_free(s->notify_dev); 1480 } 1481 1482 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1483 { 1484 colo_compare_active = false; 1485 qemu_mutex_init(&colo_compare_mutex); 1486 } 1487 1488 static const TypeInfo colo_compare_info = { 1489 .name = TYPE_COLO_COMPARE, 1490 .parent = TYPE_OBJECT, 1491 .instance_size = sizeof(CompareState), 1492 .instance_init = colo_compare_init, 1493 .instance_finalize = colo_compare_finalize, 1494 .class_size = sizeof(CompareClass), 1495 .class_init = colo_compare_class_init, 1496 .interfaces = (InterfaceInfo[]) { 1497 { TYPE_USER_CREATABLE }, 1498 { } 1499 } 1500 }; 1501 1502 static void register_types(void) 1503 { 1504 type_register_static(&colo_compare_info); 1505 } 1506 1507 type_init(register_types); 1508