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/error-report.h" 17 #include "trace.h" 18 #include "qapi/error.h" 19 #include "net/net.h" 20 #include "net/eth.h" 21 #include "qom/object_interfaces.h" 22 #include "qemu/iov.h" 23 #include "qom/object.h" 24 #include "net/queue.h" 25 #include "chardev/char-fe.h" 26 #include "qemu/sockets.h" 27 #include "colo.h" 28 #include "sysemu/iothread.h" 29 #include "net/colo-compare.h" 30 #include "migration/colo.h" 31 #include "util.h" 32 33 #include "block/aio-wait.h" 34 #include "qemu/coroutine.h" 35 36 #define TYPE_COLO_COMPARE "colo-compare" 37 typedef struct CompareState CompareState; 38 DECLARE_INSTANCE_CHECKER(CompareState, COLO_COMPARE, 39 TYPE_COLO_COMPARE) 40 41 static QTAILQ_HEAD(, CompareState) net_compares = 42 QTAILQ_HEAD_INITIALIZER(net_compares); 43 44 static NotifierList colo_compare_notifiers = 45 NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers); 46 47 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 48 #define MAX_QUEUE_SIZE 1024 49 50 #define COLO_COMPARE_FREE_PRIMARY 0x01 51 #define COLO_COMPARE_FREE_SECONDARY 0x02 52 53 #define REGULAR_PACKET_CHECK_MS 1000 54 #define DEFAULT_TIME_OUT_MS 3000 55 56 /* #define DEBUG_COLO_PACKETS */ 57 58 static QemuMutex colo_compare_mutex; 59 static bool colo_compare_active; 60 static QemuMutex event_mtx; 61 static QemuCond event_complete_cond; 62 static int event_unhandled_count; 63 static uint32_t max_queue_size; 64 65 /* 66 * + CompareState ++ 67 * | | 68 * +---------------+ +---------------+ +---------------+ 69 * | conn list + - > conn + ------- > conn + -- > ...... 70 * +---------------+ +---------------+ +---------------+ 71 * | | | | | | 72 * +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 73 * |primary | |secondary |primary | |secondary 74 * |packet | |packet + |packet | |packet + 75 * +--------+ +--------+ +--------+ +--------+ 76 * | | | | 77 * +---v----+ +---v----+ +---v----+ +---v----+ 78 * |primary | |secondary |primary | |secondary 79 * |packet | |packet + |packet | |packet + 80 * +--------+ +--------+ +--------+ +--------+ 81 * | | | | 82 * +---v----+ +---v----+ +---v----+ +---v----+ 83 * |primary | |secondary |primary | |secondary 84 * |packet | |packet + |packet | |packet + 85 * +--------+ +--------+ +--------+ +--------+ 86 */ 87 88 typedef struct SendCo { 89 Coroutine *co; 90 struct CompareState *s; 91 CharBackend *chr; 92 GQueue send_list; 93 bool notify_remote_frame; 94 bool done; 95 int ret; 96 } SendCo; 97 98 typedef struct SendEntry { 99 uint32_t size; 100 uint32_t vnet_hdr_len; 101 uint8_t *buf; 102 } SendEntry; 103 104 struct CompareState { 105 Object parent; 106 107 char *pri_indev; 108 char *sec_indev; 109 char *outdev; 110 char *notify_dev; 111 CharBackend chr_pri_in; 112 CharBackend chr_sec_in; 113 CharBackend chr_out; 114 CharBackend chr_notify_dev; 115 SocketReadState pri_rs; 116 SocketReadState sec_rs; 117 SocketReadState notify_rs; 118 SendCo out_sendco; 119 SendCo notify_sendco; 120 bool vnet_hdr; 121 uint64_t compare_timeout; 122 uint32_t expired_scan_cycle; 123 124 /* 125 * Record the connection that through the NIC 126 * Element type: Connection 127 */ 128 GQueue conn_list; 129 /* Record the connection without repetition */ 130 GHashTable *connection_track_table; 131 132 IOThread *iothread; 133 GMainContext *worker_context; 134 QEMUTimer *packet_check_timer; 135 136 QEMUBH *event_bh; 137 enum colo_event event; 138 139 QTAILQ_ENTRY(CompareState) next; 140 }; 141 142 typedef struct CompareClass { 143 ObjectClass parent_class; 144 } CompareClass; 145 146 enum { 147 PRIMARY_IN = 0, 148 SECONDARY_IN, 149 }; 150 151 static const char *colo_mode[] = { 152 [PRIMARY_IN] = "primary", 153 [SECONDARY_IN] = "secondary", 154 }; 155 156 static int compare_chr_send(CompareState *s, 157 uint8_t *buf, 158 uint32_t size, 159 uint32_t vnet_hdr_len, 160 bool notify_remote_frame, 161 bool zero_copy); 162 163 static bool packet_matches_str(const char *str, 164 const uint8_t *buf, 165 uint32_t packet_len) 166 { 167 if (packet_len != strlen(str)) { 168 return false; 169 } 170 171 return !memcmp(str, buf, packet_len); 172 } 173 174 static void notify_remote_frame(CompareState *s) 175 { 176 char msg[] = "DO_CHECKPOINT"; 177 int ret = 0; 178 179 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 180 if (ret < 0) { 181 error_report("Notify Xen COLO-frame failed"); 182 } 183 } 184 185 static void colo_compare_inconsistency_notify(CompareState *s) 186 { 187 if (s->notify_dev) { 188 notify_remote_frame(s); 189 } else { 190 notifier_list_notify(&colo_compare_notifiers, 191 NULL); 192 } 193 } 194 195 /* Use restricted to colo_insert_packet() */ 196 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 197 { 198 return b->tcp_seq - a->tcp_seq; 199 } 200 201 static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) 202 { 203 Packet *pkt = data; 204 struct tcp_hdr *tcphd; 205 206 tcphd = (struct tcp_hdr *)pkt->transport_header; 207 208 pkt->tcp_seq = ntohl(tcphd->th_seq); 209 pkt->tcp_ack = ntohl(tcphd->th_ack); 210 /* Need to consider ACK will bigger than uint32_t MAX */ 211 *max_ack = pkt->tcp_ack - *max_ack > 0 ? pkt->tcp_ack : *max_ack; 212 pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data 213 + (tcphd->th_off << 2); 214 pkt->payload_size = pkt->size - pkt->header_size; 215 pkt->seq_end = pkt->tcp_seq + pkt->payload_size; 216 pkt->flags = tcphd->th_flags; 217 } 218 219 /* 220 * Return 1 on success, if return 0 means the 221 * packet will be dropped 222 */ 223 static int colo_insert_packet(GQueue *queue, Packet *pkt, uint32_t *max_ack) 224 { 225 if (g_queue_get_length(queue) <= max_queue_size) { 226 if (pkt->ip->ip_p == IPPROTO_TCP) { 227 fill_pkt_tcp_info(pkt, max_ack); 228 g_queue_insert_sorted(queue, 229 pkt, 230 (GCompareDataFunc)seq_sorter, 231 NULL); 232 } else { 233 g_queue_push_tail(queue, pkt); 234 } 235 return 1; 236 } 237 return 0; 238 } 239 240 /* 241 * Return 0 on success, if return -1 means the pkt 242 * is unsupported(arp and ipv6) and will be sent later 243 */ 244 static int packet_enqueue(CompareState *s, int mode, Connection **con) 245 { 246 ConnectionKey key; 247 Packet *pkt = NULL; 248 Connection *conn; 249 int ret; 250 251 if (mode == PRIMARY_IN) { 252 pkt = packet_new(s->pri_rs.buf, 253 s->pri_rs.packet_len, 254 s->pri_rs.vnet_hdr_len); 255 } else { 256 pkt = packet_new(s->sec_rs.buf, 257 s->sec_rs.packet_len, 258 s->sec_rs.vnet_hdr_len); 259 } 260 261 if (parse_packet_early(pkt)) { 262 packet_destroy(pkt, NULL); 263 pkt = NULL; 264 return -1; 265 } 266 fill_connection_key(pkt, &key, false); 267 268 conn = connection_get(s->connection_track_table, 269 &key, 270 &s->conn_list); 271 272 if (!conn->processing) { 273 g_queue_push_tail(&s->conn_list, conn); 274 conn->processing = true; 275 } 276 277 if (mode == PRIMARY_IN) { 278 ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack); 279 } else { 280 ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack); 281 } 282 283 if (!ret) { 284 trace_colo_compare_drop_packet(colo_mode[mode], 285 "queue size too big, drop packet"); 286 packet_destroy(pkt, NULL); 287 pkt = NULL; 288 } 289 290 *con = conn; 291 292 return 0; 293 } 294 295 static inline bool after(uint32_t seq1, uint32_t seq2) 296 { 297 return (int32_t)(seq1 - seq2) > 0; 298 } 299 300 static void colo_release_primary_pkt(CompareState *s, Packet *pkt) 301 { 302 int ret; 303 ret = compare_chr_send(s, 304 pkt->data, 305 pkt->size, 306 pkt->vnet_hdr_len, 307 false, 308 true); 309 if (ret < 0) { 310 error_report("colo send primary packet failed"); 311 } 312 trace_colo_compare_main("packet same and release packet"); 313 packet_destroy_partial(pkt, NULL); 314 } 315 316 /* 317 * The IP packets sent by primary and secondary 318 * will be compared in here 319 * TODO support ip fragment, Out-Of-Order 320 * return: 0 means packet same 321 * > 0 || < 0 means packet different 322 */ 323 static int colo_compare_packet_payload(Packet *ppkt, 324 Packet *spkt, 325 uint16_t poffset, 326 uint16_t soffset, 327 uint16_t len) 328 329 { 330 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 331 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 332 333 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 334 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 335 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 336 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 337 338 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 339 pri_ip_dst, spkt->size, 340 sec_ip_src, sec_ip_dst); 341 } 342 343 return memcmp(ppkt->data + poffset, spkt->data + soffset, len); 344 } 345 346 /* 347 * return true means that the payload is consist and 348 * need to make the next comparison, false means do 349 * the checkpoint 350 */ 351 static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt, 352 int8_t *mark, uint32_t max_ack) 353 { 354 *mark = 0; 355 356 if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) { 357 if (!colo_compare_packet_payload(ppkt, spkt, 358 ppkt->header_size, spkt->header_size, 359 ppkt->payload_size)) { 360 *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY; 361 return true; 362 } 363 } 364 365 /* one part of secondary packet payload still need to be compared */ 366 if (!after(ppkt->seq_end, spkt->seq_end)) { 367 if (!colo_compare_packet_payload(ppkt, spkt, 368 ppkt->header_size + ppkt->offset, 369 spkt->header_size + spkt->offset, 370 ppkt->payload_size - ppkt->offset)) { 371 if (!after(ppkt->tcp_ack, max_ack)) { 372 *mark = COLO_COMPARE_FREE_PRIMARY; 373 spkt->offset += ppkt->payload_size - ppkt->offset; 374 return true; 375 } else { 376 /* secondary guest hasn't ack the data, don't send 377 * out this packet 378 */ 379 return false; 380 } 381 } 382 } else { 383 /* primary packet is longer than secondary packet, compare 384 * the same part and mark the primary packet offset 385 */ 386 if (!colo_compare_packet_payload(ppkt, spkt, 387 ppkt->header_size + ppkt->offset, 388 spkt->header_size + spkt->offset, 389 spkt->payload_size - spkt->offset)) { 390 *mark = COLO_COMPARE_FREE_SECONDARY; 391 ppkt->offset += spkt->payload_size - spkt->offset; 392 return true; 393 } 394 } 395 396 return false; 397 } 398 399 static void colo_compare_tcp(CompareState *s, Connection *conn) 400 { 401 Packet *ppkt = NULL, *spkt = NULL; 402 int8_t mark; 403 404 /* 405 * If ppkt and spkt have the same payload, but ppkt's ACK 406 * is greater than spkt's ACK, in this case we can not 407 * send the ppkt because it will cause the secondary guest 408 * to miss sending some data in the next. Therefore, we 409 * record the maximum ACK in the current queue at both 410 * primary side and secondary side. Only when the ack is 411 * less than the smaller of the two maximum ack, then we 412 * can ensure that the packet's payload is acknowledged by 413 * primary and secondary. 414 */ 415 uint32_t min_ack = MIN(conn->pack, conn->sack); 416 417 pri: 418 if (g_queue_is_empty(&conn->primary_list)) { 419 return; 420 } 421 ppkt = g_queue_pop_tail(&conn->primary_list); 422 sec: 423 if (g_queue_is_empty(&conn->secondary_list)) { 424 g_queue_push_tail(&conn->primary_list, ppkt); 425 return; 426 } 427 spkt = g_queue_pop_tail(&conn->secondary_list); 428 429 if (ppkt->tcp_seq == ppkt->seq_end) { 430 colo_release_primary_pkt(s, ppkt); 431 ppkt = NULL; 432 } 433 434 if (ppkt && conn->compare_seq && !after(ppkt->seq_end, conn->compare_seq)) { 435 trace_colo_compare_main("pri: this packet has compared"); 436 colo_release_primary_pkt(s, ppkt); 437 ppkt = NULL; 438 } 439 440 if (spkt->tcp_seq == spkt->seq_end) { 441 packet_destroy(spkt, NULL); 442 if (!ppkt) { 443 goto pri; 444 } else { 445 goto sec; 446 } 447 } else { 448 if (conn->compare_seq && !after(spkt->seq_end, conn->compare_seq)) { 449 trace_colo_compare_main("sec: this packet has compared"); 450 packet_destroy(spkt, NULL); 451 if (!ppkt) { 452 goto pri; 453 } else { 454 goto sec; 455 } 456 } 457 if (!ppkt) { 458 g_queue_push_tail(&conn->secondary_list, spkt); 459 goto pri; 460 } 461 } 462 463 if (colo_mark_tcp_pkt(ppkt, spkt, &mark, min_ack)) { 464 trace_colo_compare_tcp_info("pri", 465 ppkt->tcp_seq, ppkt->tcp_ack, 466 ppkt->header_size, ppkt->payload_size, 467 ppkt->offset, ppkt->flags); 468 469 trace_colo_compare_tcp_info("sec", 470 spkt->tcp_seq, spkt->tcp_ack, 471 spkt->header_size, spkt->payload_size, 472 spkt->offset, spkt->flags); 473 474 if (mark == COLO_COMPARE_FREE_PRIMARY) { 475 conn->compare_seq = ppkt->seq_end; 476 colo_release_primary_pkt(s, ppkt); 477 g_queue_push_tail(&conn->secondary_list, spkt); 478 goto pri; 479 } else if (mark == COLO_COMPARE_FREE_SECONDARY) { 480 conn->compare_seq = spkt->seq_end; 481 packet_destroy(spkt, NULL); 482 goto sec; 483 } else if (mark == (COLO_COMPARE_FREE_PRIMARY | COLO_COMPARE_FREE_SECONDARY)) { 484 conn->compare_seq = ppkt->seq_end; 485 colo_release_primary_pkt(s, ppkt); 486 packet_destroy(spkt, NULL); 487 goto pri; 488 } 489 } else { 490 g_queue_push_tail(&conn->primary_list, ppkt); 491 g_queue_push_tail(&conn->secondary_list, spkt); 492 493 #ifdef DEBUG_COLO_PACKETS 494 qemu_hexdump(stderr, "colo-compare ppkt", ppkt->data, ppkt->size); 495 qemu_hexdump(stderr, "colo-compare spkt", spkt->data, spkt->size); 496 #endif 497 498 colo_compare_inconsistency_notify(s); 499 } 500 } 501 502 503 /* 504 * Called from the compare thread on the primary 505 * for compare udp packet 506 */ 507 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 508 { 509 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 510 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 511 512 trace_colo_compare_main("compare udp"); 513 514 /* 515 * Because of ppkt and spkt are both in the same connection, 516 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 517 * same with spkt. In addition, IP header's Identification is a random 518 * field, we can handle it in IP fragmentation function later. 519 * COLO just concern the response net packet payload from primary guest 520 * and secondary guest are same or not, So we ignored all IP header include 521 * other field like TOS,TTL,IP Checksum. we only need to compare 522 * the ip payload here. 523 */ 524 if (ppkt->size != spkt->size) { 525 trace_colo_compare_main("UDP: payload size of packets are different"); 526 return -1; 527 } 528 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 529 ppkt->size - offset)) { 530 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 531 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 532 #ifdef DEBUG_COLO_PACKETS 533 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 534 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 535 #endif 536 return -1; 537 } else { 538 return 0; 539 } 540 } 541 542 /* 543 * Called from the compare thread on the primary 544 * for compare icmp packet 545 */ 546 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 547 { 548 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 549 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 550 551 trace_colo_compare_main("compare icmp"); 552 553 /* 554 * Because of ppkt and spkt are both in the same connection, 555 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 556 * same with spkt. In addition, IP header's Identification is a random 557 * field, we can handle it in IP fragmentation function later. 558 * COLO just concern the response net packet payload from primary guest 559 * and secondary guest are same or not, So we ignored all IP header include 560 * other field like TOS,TTL,IP Checksum. we only need to compare 561 * the ip payload here. 562 */ 563 if (ppkt->size != spkt->size) { 564 trace_colo_compare_main("ICMP: payload size of packets are different"); 565 return -1; 566 } 567 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 568 ppkt->size - offset)) { 569 trace_colo_compare_icmp_miscompare("primary pkt size", 570 ppkt->size); 571 trace_colo_compare_icmp_miscompare("Secondary pkt size", 572 spkt->size); 573 #ifdef DEBUG_COLO_PACKETS 574 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 575 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 576 #endif 577 return -1; 578 } else { 579 return 0; 580 } 581 } 582 583 /* 584 * Called from the compare thread on the primary 585 * for compare other packet 586 */ 587 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 588 { 589 uint16_t offset = ppkt->vnet_hdr_len; 590 591 trace_colo_compare_main("compare other"); 592 if (ppkt->size != spkt->size) { 593 trace_colo_compare_main("Other: payload size of packets are different"); 594 return -1; 595 } 596 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 597 ppkt->size - offset); 598 } 599 600 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 601 { 602 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 603 604 if ((now - pkt->creation_ms) > (*check_time)) { 605 trace_colo_old_packet_check_found(pkt->creation_ms); 606 return 0; 607 } else { 608 return 1; 609 } 610 } 611 612 void colo_compare_register_notifier(Notifier *notify) 613 { 614 notifier_list_add(&colo_compare_notifiers, notify); 615 } 616 617 void colo_compare_unregister_notifier(Notifier *notify) 618 { 619 notifier_remove(notify); 620 } 621 622 static int colo_old_packet_check_one_conn(Connection *conn, 623 CompareState *s) 624 { 625 if (!g_queue_is_empty(&conn->primary_list)) { 626 if (g_queue_find_custom(&conn->primary_list, 627 &s->compare_timeout, 628 (GCompareFunc)colo_old_packet_check_one)) 629 goto out; 630 } 631 632 if (!g_queue_is_empty(&conn->secondary_list)) { 633 if (g_queue_find_custom(&conn->secondary_list, 634 &s->compare_timeout, 635 (GCompareFunc)colo_old_packet_check_one)) 636 goto out; 637 } 638 639 return 1; 640 641 out: 642 /* Do checkpoint will flush old packet */ 643 colo_compare_inconsistency_notify(s); 644 return 0; 645 } 646 647 /* 648 * Look for old packets that the secondary hasn't matched, 649 * if we have some then we have to checkpoint to wake 650 * the secondary up. 651 */ 652 static void colo_old_packet_check(void *opaque) 653 { 654 CompareState *s = opaque; 655 656 /* 657 * If we find one old packet, stop finding job and notify 658 * COLO frame do checkpoint. 659 */ 660 g_queue_find_custom(&s->conn_list, s, 661 (GCompareFunc)colo_old_packet_check_one_conn); 662 } 663 664 static void colo_compare_packet(CompareState *s, Connection *conn, 665 int (*HandlePacket)(Packet *spkt, 666 Packet *ppkt)) 667 { 668 Packet *pkt = NULL; 669 GList *result = NULL; 670 671 while (!g_queue_is_empty(&conn->primary_list) && 672 !g_queue_is_empty(&conn->secondary_list)) { 673 pkt = g_queue_pop_tail(&conn->primary_list); 674 result = g_queue_find_custom(&conn->secondary_list, 675 pkt, (GCompareFunc)HandlePacket); 676 677 if (result) { 678 colo_release_primary_pkt(s, pkt); 679 packet_destroy(result->data, NULL); 680 g_queue_delete_link(&conn->secondary_list, result); 681 } else { 682 /* 683 * If one packet arrive late, the secondary_list or 684 * primary_list will be empty, so we can't compare it 685 * until next comparison. If the packets in the list are 686 * timeout, it will trigger a checkpoint request. 687 */ 688 trace_colo_compare_main("packet different"); 689 g_queue_push_tail(&conn->primary_list, pkt); 690 691 colo_compare_inconsistency_notify(s); 692 break; 693 } 694 } 695 } 696 697 /* 698 * Called from the compare thread on the primary 699 * for compare packet with secondary list of the 700 * specified connection when a new packet was 701 * queued to it. 702 */ 703 static void colo_compare_connection(void *opaque, void *user_data) 704 { 705 CompareState *s = user_data; 706 Connection *conn = opaque; 707 708 switch (conn->ip_proto) { 709 case IPPROTO_TCP: 710 colo_compare_tcp(s, conn); 711 break; 712 case IPPROTO_UDP: 713 colo_compare_packet(s, conn, colo_packet_compare_udp); 714 break; 715 case IPPROTO_ICMP: 716 colo_compare_packet(s, conn, colo_packet_compare_icmp); 717 break; 718 default: 719 colo_compare_packet(s, conn, colo_packet_compare_other); 720 break; 721 } 722 } 723 724 static void coroutine_fn _compare_chr_send(void *opaque) 725 { 726 SendCo *sendco = opaque; 727 CompareState *s = sendco->s; 728 int ret = 0; 729 730 while (!g_queue_is_empty(&sendco->send_list)) { 731 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 732 uint32_t len = htonl(entry->size); 733 734 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 735 736 if (ret != sizeof(len)) { 737 g_free(entry->buf); 738 g_slice_free(SendEntry, entry); 739 goto err; 740 } 741 742 if (!sendco->notify_remote_frame && s->vnet_hdr) { 743 /* 744 * We send vnet header len make other module(like filter-redirector) 745 * know how to parse net packet correctly. 746 */ 747 len = htonl(entry->vnet_hdr_len); 748 749 ret = qemu_chr_fe_write_all(sendco->chr, 750 (uint8_t *)&len, 751 sizeof(len)); 752 753 if (ret != sizeof(len)) { 754 g_free(entry->buf); 755 g_slice_free(SendEntry, entry); 756 goto err; 757 } 758 } 759 760 ret = qemu_chr_fe_write_all(sendco->chr, 761 (uint8_t *)entry->buf, 762 entry->size); 763 764 if (ret != entry->size) { 765 g_free(entry->buf); 766 g_slice_free(SendEntry, entry); 767 goto err; 768 } 769 770 g_free(entry->buf); 771 g_slice_free(SendEntry, entry); 772 } 773 774 sendco->ret = 0; 775 goto out; 776 777 err: 778 while (!g_queue_is_empty(&sendco->send_list)) { 779 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 780 g_free(entry->buf); 781 g_slice_free(SendEntry, entry); 782 } 783 sendco->ret = ret < 0 ? ret : -EIO; 784 out: 785 sendco->co = NULL; 786 sendco->done = true; 787 aio_wait_kick(); 788 } 789 790 static int compare_chr_send(CompareState *s, 791 uint8_t *buf, 792 uint32_t size, 793 uint32_t vnet_hdr_len, 794 bool notify_remote_frame, 795 bool zero_copy) 796 { 797 SendCo *sendco; 798 SendEntry *entry; 799 800 if (notify_remote_frame) { 801 sendco = &s->notify_sendco; 802 } else { 803 sendco = &s->out_sendco; 804 } 805 806 if (!size) { 807 return -1; 808 } 809 810 entry = g_slice_new(SendEntry); 811 entry->size = size; 812 entry->vnet_hdr_len = vnet_hdr_len; 813 if (zero_copy) { 814 entry->buf = buf; 815 } else { 816 entry->buf = g_malloc(size); 817 memcpy(entry->buf, buf, size); 818 } 819 g_queue_push_tail(&sendco->send_list, entry); 820 821 if (sendco->done) { 822 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 823 sendco->done = false; 824 qemu_coroutine_enter(sendco->co); 825 if (sendco->done) { 826 /* report early errors */ 827 return sendco->ret; 828 } 829 } 830 831 /* assume success */ 832 return 0; 833 } 834 835 static int compare_chr_can_read(void *opaque) 836 { 837 return COMPARE_READ_LEN_MAX; 838 } 839 840 /* 841 * Called from the main thread on the primary for packets 842 * arriving over the socket from the primary. 843 */ 844 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 845 { 846 CompareState *s = COLO_COMPARE(opaque); 847 int ret; 848 849 ret = net_fill_rstate(&s->pri_rs, buf, size); 850 if (ret == -1) { 851 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 852 NULL, NULL, true); 853 error_report("colo-compare primary_in error"); 854 } 855 } 856 857 /* 858 * Called from the main thread on the primary for packets 859 * arriving over the socket from the secondary. 860 */ 861 static void compare_sec_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->sec_rs, buf, size); 867 if (ret == -1) { 868 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 869 NULL, NULL, true); 870 error_report("colo-compare secondary_in error"); 871 } 872 } 873 874 static void compare_notify_chr(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->notify_rs, buf, size); 880 if (ret == -1) { 881 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 882 NULL, NULL, true); 883 error_report("colo-compare notify_dev error"); 884 } 885 } 886 887 /* 888 * Check old packet regularly so it can watch for any packets 889 * that the secondary hasn't produced equivalents of. 890 */ 891 static void check_old_packet_regular(void *opaque) 892 { 893 CompareState *s = opaque; 894 895 /* if have old packet we will notify checkpoint */ 896 colo_old_packet_check(s); 897 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 898 s->expired_scan_cycle); 899 } 900 901 /* Public API, Used for COLO frame to notify compare event */ 902 void colo_notify_compares_event(void *opaque, int event, Error **errp) 903 { 904 CompareState *s; 905 qemu_mutex_lock(&colo_compare_mutex); 906 907 if (!colo_compare_active) { 908 qemu_mutex_unlock(&colo_compare_mutex); 909 return; 910 } 911 912 qemu_mutex_lock(&event_mtx); 913 QTAILQ_FOREACH(s, &net_compares, next) { 914 s->event = event; 915 qemu_bh_schedule(s->event_bh); 916 event_unhandled_count++; 917 } 918 /* Wait all compare threads to finish handling this event */ 919 while (event_unhandled_count > 0) { 920 qemu_cond_wait(&event_complete_cond, &event_mtx); 921 } 922 923 qemu_mutex_unlock(&event_mtx); 924 qemu_mutex_unlock(&colo_compare_mutex); 925 } 926 927 static void colo_compare_timer_init(CompareState *s) 928 { 929 AioContext *ctx = iothread_get_aio_context(s->iothread); 930 931 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_HOST, 932 SCALE_MS, check_old_packet_regular, 933 s); 934 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) + 935 s->expired_scan_cycle); 936 } 937 938 static void colo_compare_timer_del(CompareState *s) 939 { 940 if (s->packet_check_timer) { 941 timer_free(s->packet_check_timer); 942 s->packet_check_timer = NULL; 943 } 944 } 945 946 static void colo_flush_packets(void *opaque, void *user_data); 947 948 static void colo_compare_handle_event(void *opaque) 949 { 950 CompareState *s = opaque; 951 952 switch (s->event) { 953 case COLO_EVENT_CHECKPOINT: 954 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 955 break; 956 case COLO_EVENT_FAILOVER: 957 break; 958 default: 959 break; 960 } 961 962 qemu_mutex_lock(&event_mtx); 963 assert(event_unhandled_count > 0); 964 event_unhandled_count--; 965 qemu_cond_broadcast(&event_complete_cond); 966 qemu_mutex_unlock(&event_mtx); 967 } 968 969 static void colo_compare_iothread(CompareState *s) 970 { 971 AioContext *ctx = iothread_get_aio_context(s->iothread); 972 object_ref(OBJECT(s->iothread)); 973 s->worker_context = iothread_get_g_main_context(s->iothread); 974 975 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 976 compare_pri_chr_in, NULL, NULL, 977 s, s->worker_context, true); 978 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 979 compare_sec_chr_in, NULL, NULL, 980 s, s->worker_context, true); 981 if (s->notify_dev) { 982 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 983 compare_notify_chr, NULL, NULL, 984 s, s->worker_context, true); 985 } 986 987 colo_compare_timer_init(s); 988 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 989 } 990 991 static char *compare_get_pri_indev(Object *obj, Error **errp) 992 { 993 CompareState *s = COLO_COMPARE(obj); 994 995 return g_strdup(s->pri_indev); 996 } 997 998 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 999 { 1000 CompareState *s = COLO_COMPARE(obj); 1001 1002 g_free(s->pri_indev); 1003 s->pri_indev = g_strdup(value); 1004 } 1005 1006 static char *compare_get_sec_indev(Object *obj, Error **errp) 1007 { 1008 CompareState *s = COLO_COMPARE(obj); 1009 1010 return g_strdup(s->sec_indev); 1011 } 1012 1013 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1014 { 1015 CompareState *s = COLO_COMPARE(obj); 1016 1017 g_free(s->sec_indev); 1018 s->sec_indev = g_strdup(value); 1019 } 1020 1021 static char *compare_get_outdev(Object *obj, Error **errp) 1022 { 1023 CompareState *s = COLO_COMPARE(obj); 1024 1025 return g_strdup(s->outdev); 1026 } 1027 1028 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1029 { 1030 CompareState *s = COLO_COMPARE(obj); 1031 1032 g_free(s->outdev); 1033 s->outdev = g_strdup(value); 1034 } 1035 1036 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1037 { 1038 CompareState *s = COLO_COMPARE(obj); 1039 1040 return s->vnet_hdr; 1041 } 1042 1043 static void compare_set_vnet_hdr(Object *obj, 1044 bool value, 1045 Error **errp) 1046 { 1047 CompareState *s = COLO_COMPARE(obj); 1048 1049 s->vnet_hdr = value; 1050 } 1051 1052 static char *compare_get_notify_dev(Object *obj, Error **errp) 1053 { 1054 CompareState *s = COLO_COMPARE(obj); 1055 1056 return g_strdup(s->notify_dev); 1057 } 1058 1059 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1060 { 1061 CompareState *s = COLO_COMPARE(obj); 1062 1063 g_free(s->notify_dev); 1064 s->notify_dev = g_strdup(value); 1065 } 1066 1067 static void compare_get_timeout(Object *obj, Visitor *v, 1068 const char *name, void *opaque, 1069 Error **errp) 1070 { 1071 CompareState *s = COLO_COMPARE(obj); 1072 uint64_t value = s->compare_timeout; 1073 1074 visit_type_uint64(v, name, &value, errp); 1075 } 1076 1077 static void compare_set_timeout(Object *obj, Visitor *v, 1078 const char *name, void *opaque, 1079 Error **errp) 1080 { 1081 CompareState *s = COLO_COMPARE(obj); 1082 uint32_t value; 1083 1084 if (!visit_type_uint32(v, name, &value, errp)) { 1085 return; 1086 } 1087 if (!value) { 1088 error_setg(errp, "Property '%s.%s' requires a positive value", 1089 object_get_typename(obj), name); 1090 return; 1091 } 1092 s->compare_timeout = value; 1093 } 1094 1095 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1096 const char *name, void *opaque, 1097 Error **errp) 1098 { 1099 CompareState *s = COLO_COMPARE(obj); 1100 uint32_t value = s->expired_scan_cycle; 1101 1102 visit_type_uint32(v, name, &value, errp); 1103 } 1104 1105 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1106 const char *name, void *opaque, 1107 Error **errp) 1108 { 1109 CompareState *s = COLO_COMPARE(obj); 1110 uint32_t value; 1111 1112 if (!visit_type_uint32(v, name, &value, errp)) { 1113 return; 1114 } 1115 if (!value) { 1116 error_setg(errp, "Property '%s.%s' requires a positive value", 1117 object_get_typename(obj), name); 1118 return; 1119 } 1120 s->expired_scan_cycle = value; 1121 } 1122 1123 static void get_max_queue_size(Object *obj, Visitor *v, 1124 const char *name, void *opaque, 1125 Error **errp) 1126 { 1127 uint32_t value = max_queue_size; 1128 1129 visit_type_uint32(v, name, &value, errp); 1130 } 1131 1132 static void set_max_queue_size(Object *obj, Visitor *v, 1133 const char *name, void *opaque, 1134 Error **errp) 1135 { 1136 uint64_t value; 1137 1138 if (!visit_type_uint64(v, name, &value, errp)) { 1139 return; 1140 } 1141 if (!value) { 1142 error_setg(errp, "Property '%s.%s' requires a positive value", 1143 object_get_typename(obj), name); 1144 return; 1145 } 1146 max_queue_size = value; 1147 } 1148 1149 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1150 { 1151 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1152 Connection *conn = NULL; 1153 1154 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1155 trace_colo_compare_main("primary: unsupported packet in"); 1156 compare_chr_send(s, 1157 pri_rs->buf, 1158 pri_rs->packet_len, 1159 pri_rs->vnet_hdr_len, 1160 false, 1161 false); 1162 } else { 1163 /* compare packet in the specified connection */ 1164 colo_compare_connection(conn, s); 1165 } 1166 } 1167 1168 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1169 { 1170 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1171 Connection *conn = NULL; 1172 1173 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1174 trace_colo_compare_main("secondary: unsupported packet in"); 1175 } else { 1176 /* compare packet in the specified connection */ 1177 colo_compare_connection(conn, s); 1178 } 1179 } 1180 1181 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1182 { 1183 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1184 1185 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1186 int ret; 1187 1188 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1189 notify_rs->buf, 1190 notify_rs->packet_len)) { 1191 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1192 if (ret < 0) { 1193 error_report("Notify Xen COLO-frame INIT failed"); 1194 } 1195 } else if (packet_matches_str("COLO_CHECKPOINT", 1196 notify_rs->buf, 1197 notify_rs->packet_len)) { 1198 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1199 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1200 } else { 1201 error_report("COLO compare got unsupported instruction"); 1202 } 1203 } 1204 1205 /* 1206 * Return 0 is success. 1207 * Return 1 is failed. 1208 */ 1209 static int find_and_check_chardev(Chardev **chr, 1210 char *chr_name, 1211 Error **errp) 1212 { 1213 *chr = qemu_chr_find(chr_name); 1214 if (*chr == NULL) { 1215 error_setg(errp, "Device '%s' not found", 1216 chr_name); 1217 return 1; 1218 } 1219 1220 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1221 error_setg(errp, "chardev \"%s\" is not reconnectable", 1222 chr_name); 1223 return 1; 1224 } 1225 1226 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1227 error_setg(errp, "chardev \"%s\" cannot switch context", 1228 chr_name); 1229 return 1; 1230 } 1231 1232 return 0; 1233 } 1234 1235 /* 1236 * Called from the main thread on the primary 1237 * to setup colo-compare. 1238 */ 1239 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1240 { 1241 CompareState *s = COLO_COMPARE(uc); 1242 Chardev *chr; 1243 1244 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1245 error_setg(errp, "colo compare needs 'primary_in' ," 1246 "'secondary_in','outdev','iothread' property set"); 1247 return; 1248 } else if (!strcmp(s->pri_indev, s->outdev) || 1249 !strcmp(s->sec_indev, s->outdev) || 1250 !strcmp(s->pri_indev, s->sec_indev)) { 1251 error_setg(errp, "'indev' and 'outdev' could not be same " 1252 "for compare module"); 1253 return; 1254 } 1255 1256 if (!s->compare_timeout) { 1257 /* Set default value to 3000 MS */ 1258 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1259 } 1260 1261 if (!s->expired_scan_cycle) { 1262 /* Set default value to 1000 MS */ 1263 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1264 } 1265 1266 if (!max_queue_size) { 1267 /* Set default queue size to 1024 */ 1268 max_queue_size = MAX_QUEUE_SIZE; 1269 } 1270 1271 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1272 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1273 return; 1274 } 1275 1276 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1277 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1278 return; 1279 } 1280 1281 if (find_and_check_chardev(&chr, s->outdev, errp) || 1282 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1283 return; 1284 } 1285 1286 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1287 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1288 1289 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1290 if (s->notify_dev) { 1291 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1292 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1293 return; 1294 } 1295 1296 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1297 s->vnet_hdr); 1298 } 1299 1300 s->out_sendco.s = s; 1301 s->out_sendco.chr = &s->chr_out; 1302 s->out_sendco.notify_remote_frame = false; 1303 s->out_sendco.done = true; 1304 g_queue_init(&s->out_sendco.send_list); 1305 1306 if (s->notify_dev) { 1307 s->notify_sendco.s = s; 1308 s->notify_sendco.chr = &s->chr_notify_dev; 1309 s->notify_sendco.notify_remote_frame = true; 1310 s->notify_sendco.done = true; 1311 g_queue_init(&s->notify_sendco.send_list); 1312 } 1313 1314 g_queue_init(&s->conn_list); 1315 1316 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1317 connection_key_equal, 1318 g_free, 1319 NULL); 1320 1321 colo_compare_iothread(s); 1322 1323 qemu_mutex_lock(&colo_compare_mutex); 1324 if (!colo_compare_active) { 1325 qemu_mutex_init(&event_mtx); 1326 qemu_cond_init(&event_complete_cond); 1327 colo_compare_active = true; 1328 } 1329 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1330 qemu_mutex_unlock(&colo_compare_mutex); 1331 1332 return; 1333 } 1334 1335 static void colo_flush_packets(void *opaque, void *user_data) 1336 { 1337 CompareState *s = user_data; 1338 Connection *conn = opaque; 1339 Packet *pkt = NULL; 1340 1341 while (!g_queue_is_empty(&conn->primary_list)) { 1342 pkt = g_queue_pop_tail(&conn->primary_list); 1343 compare_chr_send(s, 1344 pkt->data, 1345 pkt->size, 1346 pkt->vnet_hdr_len, 1347 false, 1348 true); 1349 packet_destroy_partial(pkt, NULL); 1350 } 1351 while (!g_queue_is_empty(&conn->secondary_list)) { 1352 pkt = g_queue_pop_tail(&conn->secondary_list); 1353 packet_destroy(pkt, NULL); 1354 } 1355 } 1356 1357 static void colo_compare_class_init(ObjectClass *oc, void *data) 1358 { 1359 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1360 1361 ucc->complete = colo_compare_complete; 1362 } 1363 1364 static void colo_compare_init(Object *obj) 1365 { 1366 CompareState *s = COLO_COMPARE(obj); 1367 1368 object_property_add_str(obj, "primary_in", 1369 compare_get_pri_indev, compare_set_pri_indev); 1370 object_property_add_str(obj, "secondary_in", 1371 compare_get_sec_indev, compare_set_sec_indev); 1372 object_property_add_str(obj, "outdev", 1373 compare_get_outdev, compare_set_outdev); 1374 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1375 (Object **)&s->iothread, 1376 object_property_allow_set_link, 1377 OBJ_PROP_LINK_STRONG); 1378 /* This parameter just for Xen COLO */ 1379 object_property_add_str(obj, "notify_dev", 1380 compare_get_notify_dev, compare_set_notify_dev); 1381 1382 object_property_add(obj, "compare_timeout", "uint64", 1383 compare_get_timeout, 1384 compare_set_timeout, NULL, NULL); 1385 1386 object_property_add(obj, "expired_scan_cycle", "uint32", 1387 compare_get_expired_scan_cycle, 1388 compare_set_expired_scan_cycle, NULL, NULL); 1389 1390 object_property_add(obj, "max_queue_size", "uint32", 1391 get_max_queue_size, 1392 set_max_queue_size, NULL, NULL); 1393 1394 s->vnet_hdr = false; 1395 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1396 compare_set_vnet_hdr); 1397 } 1398 1399 void colo_compare_cleanup(void) 1400 { 1401 CompareState *tmp = NULL; 1402 CompareState *n = NULL; 1403 1404 QTAILQ_FOREACH_SAFE(tmp, &net_compares, next, n) { 1405 object_unparent(OBJECT(tmp)); 1406 } 1407 } 1408 1409 static void colo_compare_finalize(Object *obj) 1410 { 1411 CompareState *s = COLO_COMPARE(obj); 1412 CompareState *tmp = NULL; 1413 1414 qemu_mutex_lock(&colo_compare_mutex); 1415 QTAILQ_FOREACH(tmp, &net_compares, next) { 1416 if (tmp == s) { 1417 QTAILQ_REMOVE(&net_compares, s, next); 1418 break; 1419 } 1420 } 1421 if (QTAILQ_EMPTY(&net_compares)) { 1422 colo_compare_active = false; 1423 qemu_mutex_destroy(&event_mtx); 1424 qemu_cond_destroy(&event_complete_cond); 1425 } 1426 qemu_mutex_unlock(&colo_compare_mutex); 1427 1428 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1429 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1430 qemu_chr_fe_deinit(&s->chr_out, false); 1431 if (s->notify_dev) { 1432 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1433 } 1434 1435 colo_compare_timer_del(s); 1436 1437 qemu_bh_delete(s->event_bh); 1438 1439 AioContext *ctx = iothread_get_aio_context(s->iothread); 1440 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1441 if (s->notify_dev) { 1442 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1443 } 1444 1445 /* Release all unhandled packets after compare thead exited */ 1446 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1447 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1448 1449 g_queue_clear(&s->conn_list); 1450 g_queue_clear(&s->out_sendco.send_list); 1451 if (s->notify_dev) { 1452 g_queue_clear(&s->notify_sendco.send_list); 1453 } 1454 1455 if (s->connection_track_table) { 1456 g_hash_table_destroy(s->connection_track_table); 1457 } 1458 1459 object_unref(OBJECT(s->iothread)); 1460 1461 g_free(s->pri_indev); 1462 g_free(s->sec_indev); 1463 g_free(s->outdev); 1464 g_free(s->notify_dev); 1465 } 1466 1467 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1468 { 1469 colo_compare_active = false; 1470 qemu_mutex_init(&colo_compare_mutex); 1471 } 1472 1473 static const TypeInfo colo_compare_info = { 1474 .name = TYPE_COLO_COMPARE, 1475 .parent = TYPE_OBJECT, 1476 .instance_size = sizeof(CompareState), 1477 .instance_init = colo_compare_init, 1478 .instance_finalize = colo_compare_finalize, 1479 .class_size = sizeof(CompareClass), 1480 .class_init = colo_compare_class_init, 1481 .interfaces = (InterfaceInfo[]) { 1482 { TYPE_USER_CREATABLE }, 1483 { } 1484 } 1485 }; 1486 1487 static void register_types(void) 1488 { 1489 type_register_static(&colo_compare_info); 1490 } 1491 1492 type_init(register_types); 1493