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(stderr, "colo-compare ppkt", ppkt->data, ppkt->size); 501 qemu_hexdump(stderr, "colo-compare spkt", spkt->data, spkt->size); 502 #endif 503 504 colo_compare_inconsistency_notify(s); 505 } 506 } 507 508 509 /* 510 * Called from the compare thread on the primary 511 * for compare udp packet 512 */ 513 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 514 { 515 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 516 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 517 518 trace_colo_compare_main("compare udp"); 519 520 /* 521 * Because of ppkt and spkt are both in the same connection, 522 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 523 * same with spkt. In addition, IP header's Identification is a random 524 * field, we can handle it in IP fragmentation function later. 525 * COLO just concern the response net packet payload from primary guest 526 * and secondary guest are same or not, So we ignored all IP header include 527 * other field like TOS,TTL,IP Checksum. we only need to compare 528 * the ip payload here. 529 */ 530 if (ppkt->size != spkt->size) { 531 trace_colo_compare_main("UDP: payload size of packets are different"); 532 return -1; 533 } 534 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 535 ppkt->size - offset)) { 536 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 537 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 538 #ifdef DEBUG_COLO_PACKETS 539 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 540 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 541 #endif 542 return -1; 543 } else { 544 return 0; 545 } 546 } 547 548 /* 549 * Called from the compare thread on the primary 550 * for compare icmp packet 551 */ 552 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 553 { 554 uint16_t network_header_length = ppkt->ip->ip_hl << 2; 555 uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; 556 557 trace_colo_compare_main("compare icmp"); 558 559 /* 560 * Because of ppkt and spkt are both in the same connection, 561 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 562 * same with spkt. In addition, IP header's Identification is a random 563 * field, we can handle it in IP fragmentation function later. 564 * COLO just concern the response net packet payload from primary guest 565 * and secondary guest are same or not, So we ignored all IP header include 566 * other field like TOS,TTL,IP Checksum. we only need to compare 567 * the ip payload here. 568 */ 569 if (ppkt->size != spkt->size) { 570 trace_colo_compare_main("ICMP: payload size of packets are different"); 571 return -1; 572 } 573 if (colo_compare_packet_payload(ppkt, spkt, offset, offset, 574 ppkt->size - offset)) { 575 trace_colo_compare_icmp_miscompare("primary pkt size", 576 ppkt->size); 577 trace_colo_compare_icmp_miscompare("Secondary pkt size", 578 spkt->size); 579 #ifdef DEBUG_COLO_PACKETS 580 qemu_hexdump(stderr, "colo-compare pri pkt", ppkt->data, ppkt->size); 581 qemu_hexdump(stderr, "colo-compare sec pkt", spkt->data, spkt->size); 582 #endif 583 return -1; 584 } else { 585 return 0; 586 } 587 } 588 589 /* 590 * Called from the compare thread on the primary 591 * for compare other packet 592 */ 593 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 594 { 595 uint16_t offset = ppkt->vnet_hdr_len; 596 597 trace_colo_compare_main("compare other"); 598 if (trace_event_get_state_backends(TRACE_COLO_COMPARE_IP_INFO)) { 599 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 600 601 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 602 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 603 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 604 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 605 606 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 607 pri_ip_dst, spkt->size, 608 sec_ip_src, sec_ip_dst); 609 } 610 611 if (ppkt->size != spkt->size) { 612 trace_colo_compare_main("Other: payload size of packets are different"); 613 return -1; 614 } 615 return colo_compare_packet_payload(ppkt, spkt, offset, offset, 616 ppkt->size - offset); 617 } 618 619 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 620 { 621 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 622 623 if ((now - pkt->creation_ms) > (*check_time)) { 624 trace_colo_old_packet_check_found(pkt->creation_ms); 625 return 0; 626 } else { 627 return 1; 628 } 629 } 630 631 void colo_compare_register_notifier(Notifier *notify) 632 { 633 notifier_list_add(&colo_compare_notifiers, notify); 634 } 635 636 void colo_compare_unregister_notifier(Notifier *notify) 637 { 638 notifier_remove(notify); 639 } 640 641 static int colo_old_packet_check_one_conn(Connection *conn, 642 CompareState *s) 643 { 644 GList *result = NULL; 645 646 result = g_queue_find_custom(&conn->primary_list, 647 &s->compare_timeout, 648 (GCompareFunc)colo_old_packet_check_one); 649 650 if (result) { 651 /* Do checkpoint will flush old packet */ 652 colo_compare_inconsistency_notify(s); 653 return 0; 654 } 655 656 return 1; 657 } 658 659 /* 660 * Look for old packets that the secondary hasn't matched, 661 * if we have some then we have to checkpoint to wake 662 * the secondary up. 663 */ 664 static void colo_old_packet_check(void *opaque) 665 { 666 CompareState *s = opaque; 667 668 /* 669 * If we find one old packet, stop finding job and notify 670 * COLO frame do checkpoint. 671 */ 672 g_queue_find_custom(&s->conn_list, s, 673 (GCompareFunc)colo_old_packet_check_one_conn); 674 } 675 676 static void colo_compare_packet(CompareState *s, Connection *conn, 677 int (*HandlePacket)(Packet *spkt, 678 Packet *ppkt)) 679 { 680 Packet *pkt = NULL; 681 GList *result = NULL; 682 683 while (!g_queue_is_empty(&conn->primary_list) && 684 !g_queue_is_empty(&conn->secondary_list)) { 685 pkt = g_queue_pop_head(&conn->primary_list); 686 result = g_queue_find_custom(&conn->secondary_list, 687 pkt, (GCompareFunc)HandlePacket); 688 689 if (result) { 690 colo_release_primary_pkt(s, pkt); 691 g_queue_remove(&conn->secondary_list, result->data); 692 } else { 693 /* 694 * If one packet arrive late, the secondary_list or 695 * primary_list will be empty, so we can't compare it 696 * until next comparison. If the packets in the list are 697 * timeout, it will trigger a checkpoint request. 698 */ 699 trace_colo_compare_main("packet different"); 700 g_queue_push_head(&conn->primary_list, pkt); 701 702 colo_compare_inconsistency_notify(s); 703 break; 704 } 705 } 706 } 707 708 /* 709 * Called from the compare thread on the primary 710 * for compare packet with secondary list of the 711 * specified connection when a new packet was 712 * queued to it. 713 */ 714 static void colo_compare_connection(void *opaque, void *user_data) 715 { 716 CompareState *s = user_data; 717 Connection *conn = opaque; 718 719 switch (conn->ip_proto) { 720 case IPPROTO_TCP: 721 colo_compare_tcp(s, conn); 722 break; 723 case IPPROTO_UDP: 724 colo_compare_packet(s, conn, colo_packet_compare_udp); 725 break; 726 case IPPROTO_ICMP: 727 colo_compare_packet(s, conn, colo_packet_compare_icmp); 728 break; 729 default: 730 colo_compare_packet(s, conn, colo_packet_compare_other); 731 break; 732 } 733 } 734 735 static void coroutine_fn _compare_chr_send(void *opaque) 736 { 737 SendCo *sendco = opaque; 738 CompareState *s = sendco->s; 739 int ret = 0; 740 741 while (!g_queue_is_empty(&sendco->send_list)) { 742 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 743 uint32_t len = htonl(entry->size); 744 745 ret = qemu_chr_fe_write_all(sendco->chr, (uint8_t *)&len, sizeof(len)); 746 747 if (ret != sizeof(len)) { 748 g_free(entry->buf); 749 g_slice_free(SendEntry, entry); 750 goto err; 751 } 752 753 if (!sendco->notify_remote_frame && s->vnet_hdr) { 754 /* 755 * We send vnet header len make other module(like filter-redirector) 756 * know how to parse net packet correctly. 757 */ 758 len = htonl(entry->vnet_hdr_len); 759 760 ret = qemu_chr_fe_write_all(sendco->chr, 761 (uint8_t *)&len, 762 sizeof(len)); 763 764 if (ret != sizeof(len)) { 765 g_free(entry->buf); 766 g_slice_free(SendEntry, entry); 767 goto err; 768 } 769 } 770 771 ret = qemu_chr_fe_write_all(sendco->chr, 772 (uint8_t *)entry->buf, 773 entry->size); 774 775 if (ret != entry->size) { 776 g_free(entry->buf); 777 g_slice_free(SendEntry, entry); 778 goto err; 779 } 780 781 g_free(entry->buf); 782 g_slice_free(SendEntry, entry); 783 } 784 785 sendco->ret = 0; 786 goto out; 787 788 err: 789 while (!g_queue_is_empty(&sendco->send_list)) { 790 SendEntry *entry = g_queue_pop_tail(&sendco->send_list); 791 g_free(entry->buf); 792 g_slice_free(SendEntry, entry); 793 } 794 sendco->ret = ret < 0 ? ret : -EIO; 795 out: 796 sendco->co = NULL; 797 sendco->done = true; 798 aio_wait_kick(); 799 } 800 801 static int compare_chr_send(CompareState *s, 802 uint8_t *buf, 803 uint32_t size, 804 uint32_t vnet_hdr_len, 805 bool notify_remote_frame, 806 bool zero_copy) 807 { 808 SendCo *sendco; 809 SendEntry *entry; 810 811 if (notify_remote_frame) { 812 sendco = &s->notify_sendco; 813 } else { 814 sendco = &s->out_sendco; 815 } 816 817 if (!size) { 818 return 0; 819 } 820 821 entry = g_slice_new(SendEntry); 822 entry->size = size; 823 entry->vnet_hdr_len = vnet_hdr_len; 824 if (zero_copy) { 825 entry->buf = buf; 826 } else { 827 entry->buf = g_malloc(size); 828 memcpy(entry->buf, buf, size); 829 } 830 g_queue_push_head(&sendco->send_list, entry); 831 832 if (sendco->done) { 833 sendco->co = qemu_coroutine_create(_compare_chr_send, sendco); 834 sendco->done = false; 835 qemu_coroutine_enter(sendco->co); 836 if (sendco->done) { 837 /* report early errors */ 838 return sendco->ret; 839 } 840 } 841 842 /* assume success */ 843 return 0; 844 } 845 846 static int compare_chr_can_read(void *opaque) 847 { 848 return COMPARE_READ_LEN_MAX; 849 } 850 851 /* 852 * Called from the main thread on the primary for packets 853 * arriving over the socket from the primary. 854 */ 855 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 856 { 857 CompareState *s = COLO_COMPARE(opaque); 858 int ret; 859 860 ret = net_fill_rstate(&s->pri_rs, buf, size); 861 if (ret == -1) { 862 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 863 NULL, NULL, true); 864 error_report("colo-compare primary_in error"); 865 } 866 } 867 868 /* 869 * Called from the main thread on the primary for packets 870 * arriving over the socket from the secondary. 871 */ 872 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 873 { 874 CompareState *s = COLO_COMPARE(opaque); 875 int ret; 876 877 ret = net_fill_rstate(&s->sec_rs, buf, size); 878 if (ret == -1) { 879 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 880 NULL, NULL, true); 881 error_report("colo-compare secondary_in error"); 882 } 883 } 884 885 static void compare_notify_chr(void *opaque, const uint8_t *buf, int size) 886 { 887 CompareState *s = COLO_COMPARE(opaque); 888 int ret; 889 890 ret = net_fill_rstate(&s->notify_rs, buf, size); 891 if (ret == -1) { 892 qemu_chr_fe_set_handlers(&s->chr_notify_dev, NULL, NULL, NULL, NULL, 893 NULL, NULL, true); 894 error_report("colo-compare notify_dev error"); 895 } 896 } 897 898 /* 899 * Check old packet regularly so it can watch for any packets 900 * that the secondary hasn't produced equivalents of. 901 */ 902 static void check_old_packet_regular(void *opaque) 903 { 904 CompareState *s = opaque; 905 906 /* if have old packet we will notify checkpoint */ 907 colo_old_packet_check(s); 908 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 909 s->expired_scan_cycle); 910 } 911 912 /* Public API, Used for COLO frame to notify compare event */ 913 void colo_notify_compares_event(void *opaque, int event, Error **errp) 914 { 915 CompareState *s; 916 qemu_mutex_lock(&colo_compare_mutex); 917 918 if (!colo_compare_active) { 919 qemu_mutex_unlock(&colo_compare_mutex); 920 return; 921 } 922 923 qemu_mutex_lock(&event_mtx); 924 QTAILQ_FOREACH(s, &net_compares, next) { 925 s->event = event; 926 qemu_bh_schedule(s->event_bh); 927 event_unhandled_count++; 928 } 929 /* Wait all compare threads to finish handling this event */ 930 while (event_unhandled_count > 0) { 931 qemu_cond_wait(&event_complete_cond, &event_mtx); 932 } 933 934 qemu_mutex_unlock(&event_mtx); 935 qemu_mutex_unlock(&colo_compare_mutex); 936 } 937 938 static void colo_compare_timer_init(CompareState *s) 939 { 940 AioContext *ctx = iothread_get_aio_context(s->iothread); 941 942 s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, 943 SCALE_MS, check_old_packet_regular, 944 s); 945 timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 946 s->expired_scan_cycle); 947 } 948 949 static void colo_compare_timer_del(CompareState *s) 950 { 951 if (s->packet_check_timer) { 952 timer_del(s->packet_check_timer); 953 timer_free(s->packet_check_timer); 954 s->packet_check_timer = NULL; 955 } 956 } 957 958 static void colo_flush_packets(void *opaque, void *user_data); 959 960 static void colo_compare_handle_event(void *opaque) 961 { 962 CompareState *s = opaque; 963 964 switch (s->event) { 965 case COLO_EVENT_CHECKPOINT: 966 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 967 break; 968 case COLO_EVENT_FAILOVER: 969 break; 970 default: 971 break; 972 } 973 974 qemu_mutex_lock(&event_mtx); 975 assert(event_unhandled_count > 0); 976 event_unhandled_count--; 977 qemu_cond_broadcast(&event_complete_cond); 978 qemu_mutex_unlock(&event_mtx); 979 } 980 981 static void colo_compare_iothread(CompareState *s) 982 { 983 AioContext *ctx = iothread_get_aio_context(s->iothread); 984 object_ref(OBJECT(s->iothread)); 985 s->worker_context = iothread_get_g_main_context(s->iothread); 986 987 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 988 compare_pri_chr_in, NULL, NULL, 989 s, s->worker_context, true); 990 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 991 compare_sec_chr_in, NULL, NULL, 992 s, s->worker_context, true); 993 if (s->notify_dev) { 994 qemu_chr_fe_set_handlers(&s->chr_notify_dev, compare_chr_can_read, 995 compare_notify_chr, NULL, NULL, 996 s, s->worker_context, true); 997 } 998 999 colo_compare_timer_init(s); 1000 s->event_bh = aio_bh_new(ctx, colo_compare_handle_event, s); 1001 } 1002 1003 static char *compare_get_pri_indev(Object *obj, Error **errp) 1004 { 1005 CompareState *s = COLO_COMPARE(obj); 1006 1007 return g_strdup(s->pri_indev); 1008 } 1009 1010 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 1011 { 1012 CompareState *s = COLO_COMPARE(obj); 1013 1014 g_free(s->pri_indev); 1015 s->pri_indev = g_strdup(value); 1016 } 1017 1018 static char *compare_get_sec_indev(Object *obj, Error **errp) 1019 { 1020 CompareState *s = COLO_COMPARE(obj); 1021 1022 return g_strdup(s->sec_indev); 1023 } 1024 1025 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 1026 { 1027 CompareState *s = COLO_COMPARE(obj); 1028 1029 g_free(s->sec_indev); 1030 s->sec_indev = g_strdup(value); 1031 } 1032 1033 static char *compare_get_outdev(Object *obj, Error **errp) 1034 { 1035 CompareState *s = COLO_COMPARE(obj); 1036 1037 return g_strdup(s->outdev); 1038 } 1039 1040 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 1041 { 1042 CompareState *s = COLO_COMPARE(obj); 1043 1044 g_free(s->outdev); 1045 s->outdev = g_strdup(value); 1046 } 1047 1048 static bool compare_get_vnet_hdr(Object *obj, Error **errp) 1049 { 1050 CompareState *s = COLO_COMPARE(obj); 1051 1052 return s->vnet_hdr; 1053 } 1054 1055 static void compare_set_vnet_hdr(Object *obj, 1056 bool value, 1057 Error **errp) 1058 { 1059 CompareState *s = COLO_COMPARE(obj); 1060 1061 s->vnet_hdr = value; 1062 } 1063 1064 static char *compare_get_notify_dev(Object *obj, Error **errp) 1065 { 1066 CompareState *s = COLO_COMPARE(obj); 1067 1068 return g_strdup(s->notify_dev); 1069 } 1070 1071 static void compare_set_notify_dev(Object *obj, const char *value, Error **errp) 1072 { 1073 CompareState *s = COLO_COMPARE(obj); 1074 1075 g_free(s->notify_dev); 1076 s->notify_dev = g_strdup(value); 1077 } 1078 1079 static void compare_get_timeout(Object *obj, Visitor *v, 1080 const char *name, void *opaque, 1081 Error **errp) 1082 { 1083 CompareState *s = COLO_COMPARE(obj); 1084 uint32_t value = s->compare_timeout; 1085 1086 visit_type_uint32(v, name, &value, errp); 1087 } 1088 1089 static void compare_set_timeout(Object *obj, Visitor *v, 1090 const char *name, void *opaque, 1091 Error **errp) 1092 { 1093 CompareState *s = COLO_COMPARE(obj); 1094 uint32_t value; 1095 1096 if (!visit_type_uint32(v, name, &value, errp)) { 1097 return; 1098 } 1099 if (!value) { 1100 error_setg(errp, "Property '%s.%s' requires a positive value", 1101 object_get_typename(obj), name); 1102 return; 1103 } 1104 s->compare_timeout = value; 1105 } 1106 1107 static void compare_get_expired_scan_cycle(Object *obj, Visitor *v, 1108 const char *name, void *opaque, 1109 Error **errp) 1110 { 1111 CompareState *s = COLO_COMPARE(obj); 1112 uint32_t value = s->expired_scan_cycle; 1113 1114 visit_type_uint32(v, name, &value, errp); 1115 } 1116 1117 static void compare_set_expired_scan_cycle(Object *obj, Visitor *v, 1118 const char *name, void *opaque, 1119 Error **errp) 1120 { 1121 CompareState *s = COLO_COMPARE(obj); 1122 uint32_t value; 1123 1124 if (!visit_type_uint32(v, name, &value, errp)) { 1125 return; 1126 } 1127 if (!value) { 1128 error_setg(errp, "Property '%s.%s' requires a positive value", 1129 object_get_typename(obj), name); 1130 return; 1131 } 1132 s->expired_scan_cycle = value; 1133 } 1134 1135 static void get_max_queue_size(Object *obj, Visitor *v, 1136 const char *name, void *opaque, 1137 Error **errp) 1138 { 1139 uint32_t value = max_queue_size; 1140 1141 visit_type_uint32(v, name, &value, errp); 1142 } 1143 1144 static void set_max_queue_size(Object *obj, Visitor *v, 1145 const char *name, void *opaque, 1146 Error **errp) 1147 { 1148 Error *local_err = NULL; 1149 uint32_t value; 1150 1151 visit_type_uint32(v, name, &value, &local_err); 1152 if (local_err) { 1153 goto out; 1154 } 1155 if (!value) { 1156 error_setg(&local_err, "Property '%s.%s' requires a positive value", 1157 object_get_typename(obj), name); 1158 goto out; 1159 } 1160 max_queue_size = value; 1161 1162 out: 1163 error_propagate(errp, local_err); 1164 } 1165 1166 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 1167 { 1168 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 1169 Connection *conn = NULL; 1170 1171 if (packet_enqueue(s, PRIMARY_IN, &conn)) { 1172 trace_colo_compare_main("primary: unsupported packet in"); 1173 compare_chr_send(s, 1174 pri_rs->buf, 1175 pri_rs->packet_len, 1176 pri_rs->vnet_hdr_len, 1177 false, 1178 false); 1179 } else { 1180 /* compare packet in the specified connection */ 1181 colo_compare_connection(conn, s); 1182 } 1183 } 1184 1185 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 1186 { 1187 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 1188 Connection *conn = NULL; 1189 1190 if (packet_enqueue(s, SECONDARY_IN, &conn)) { 1191 trace_colo_compare_main("secondary: unsupported packet in"); 1192 } else { 1193 /* compare packet in the specified connection */ 1194 colo_compare_connection(conn, s); 1195 } 1196 } 1197 1198 static void compare_notify_rs_finalize(SocketReadState *notify_rs) 1199 { 1200 CompareState *s = container_of(notify_rs, CompareState, notify_rs); 1201 1202 const char msg[] = "COLO_COMPARE_GET_XEN_INIT"; 1203 int ret; 1204 1205 if (packet_matches_str("COLO_USERSPACE_PROXY_INIT", 1206 notify_rs->buf, 1207 notify_rs->packet_len)) { 1208 ret = compare_chr_send(s, (uint8_t *)msg, strlen(msg), 0, true, false); 1209 if (ret < 0) { 1210 error_report("Notify Xen COLO-frame INIT failed"); 1211 } 1212 } else if (packet_matches_str("COLO_CHECKPOINT", 1213 notify_rs->buf, 1214 notify_rs->packet_len)) { 1215 /* colo-compare do checkpoint, flush pri packet and remove sec packet */ 1216 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1217 } else { 1218 error_report("COLO compare got unsupported instruction"); 1219 } 1220 } 1221 1222 /* 1223 * Return 0 is success. 1224 * Return 1 is failed. 1225 */ 1226 static int find_and_check_chardev(Chardev **chr, 1227 char *chr_name, 1228 Error **errp) 1229 { 1230 *chr = qemu_chr_find(chr_name); 1231 if (*chr == NULL) { 1232 error_setg(errp, "Device '%s' not found", 1233 chr_name); 1234 return 1; 1235 } 1236 1237 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 1238 error_setg(errp, "chardev \"%s\" is not reconnectable", 1239 chr_name); 1240 return 1; 1241 } 1242 1243 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) { 1244 error_setg(errp, "chardev \"%s\" cannot switch context", 1245 chr_name); 1246 return 1; 1247 } 1248 1249 return 0; 1250 } 1251 1252 /* 1253 * Called from the main thread on the primary 1254 * to setup colo-compare. 1255 */ 1256 static void colo_compare_complete(UserCreatable *uc, Error **errp) 1257 { 1258 CompareState *s = COLO_COMPARE(uc); 1259 Chardev *chr; 1260 1261 if (!s->pri_indev || !s->sec_indev || !s->outdev || !s->iothread) { 1262 error_setg(errp, "colo compare needs 'primary_in' ," 1263 "'secondary_in','outdev','iothread' property set"); 1264 return; 1265 } else if (!strcmp(s->pri_indev, s->outdev) || 1266 !strcmp(s->sec_indev, s->outdev) || 1267 !strcmp(s->pri_indev, s->sec_indev)) { 1268 error_setg(errp, "'indev' and 'outdev' could not be same " 1269 "for compare module"); 1270 return; 1271 } 1272 1273 if (!s->compare_timeout) { 1274 /* Set default value to 3000 MS */ 1275 s->compare_timeout = DEFAULT_TIME_OUT_MS; 1276 } 1277 1278 if (!s->expired_scan_cycle) { 1279 /* Set default value to 3000 MS */ 1280 s->expired_scan_cycle = REGULAR_PACKET_CHECK_MS; 1281 } 1282 1283 if (!max_queue_size) { 1284 /* Set default queue size to 1024 */ 1285 max_queue_size = MAX_QUEUE_SIZE; 1286 } 1287 1288 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 1289 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 1290 return; 1291 } 1292 1293 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 1294 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 1295 return; 1296 } 1297 1298 if (find_and_check_chardev(&chr, s->outdev, errp) || 1299 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 1300 return; 1301 } 1302 1303 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s->vnet_hdr); 1304 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, s->vnet_hdr); 1305 1306 /* Try to enable remote notify chardev, currently just for Xen COLO */ 1307 if (s->notify_dev) { 1308 if (find_and_check_chardev(&chr, s->notify_dev, errp) || 1309 !qemu_chr_fe_init(&s->chr_notify_dev, chr, errp)) { 1310 return; 1311 } 1312 1313 net_socket_rs_init(&s->notify_rs, compare_notify_rs_finalize, 1314 s->vnet_hdr); 1315 } 1316 1317 s->out_sendco.s = s; 1318 s->out_sendco.chr = &s->chr_out; 1319 s->out_sendco.notify_remote_frame = false; 1320 s->out_sendco.done = true; 1321 g_queue_init(&s->out_sendco.send_list); 1322 1323 if (s->notify_dev) { 1324 s->notify_sendco.s = s; 1325 s->notify_sendco.chr = &s->chr_notify_dev; 1326 s->notify_sendco.notify_remote_frame = true; 1327 s->notify_sendco.done = true; 1328 g_queue_init(&s->notify_sendco.send_list); 1329 } 1330 1331 g_queue_init(&s->conn_list); 1332 1333 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 1334 connection_key_equal, 1335 g_free, 1336 connection_destroy); 1337 1338 colo_compare_iothread(s); 1339 1340 qemu_mutex_lock(&colo_compare_mutex); 1341 if (!colo_compare_active) { 1342 qemu_mutex_init(&event_mtx); 1343 qemu_cond_init(&event_complete_cond); 1344 colo_compare_active = true; 1345 } 1346 QTAILQ_INSERT_TAIL(&net_compares, s, next); 1347 qemu_mutex_unlock(&colo_compare_mutex); 1348 1349 return; 1350 } 1351 1352 static void colo_flush_packets(void *opaque, void *user_data) 1353 { 1354 CompareState *s = user_data; 1355 Connection *conn = opaque; 1356 Packet *pkt = NULL; 1357 1358 while (!g_queue_is_empty(&conn->primary_list)) { 1359 pkt = g_queue_pop_head(&conn->primary_list); 1360 compare_chr_send(s, 1361 pkt->data, 1362 pkt->size, 1363 pkt->vnet_hdr_len, 1364 false, 1365 true); 1366 packet_destroy_partial(pkt, NULL); 1367 } 1368 while (!g_queue_is_empty(&conn->secondary_list)) { 1369 pkt = g_queue_pop_head(&conn->secondary_list); 1370 packet_destroy(pkt, NULL); 1371 } 1372 } 1373 1374 static void colo_compare_class_init(ObjectClass *oc, void *data) 1375 { 1376 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 1377 1378 ucc->complete = colo_compare_complete; 1379 } 1380 1381 static void colo_compare_init(Object *obj) 1382 { 1383 CompareState *s = COLO_COMPARE(obj); 1384 1385 object_property_add_str(obj, "primary_in", 1386 compare_get_pri_indev, compare_set_pri_indev); 1387 object_property_add_str(obj, "secondary_in", 1388 compare_get_sec_indev, compare_set_sec_indev); 1389 object_property_add_str(obj, "outdev", 1390 compare_get_outdev, compare_set_outdev); 1391 object_property_add_link(obj, "iothread", TYPE_IOTHREAD, 1392 (Object **)&s->iothread, 1393 object_property_allow_set_link, 1394 OBJ_PROP_LINK_STRONG); 1395 /* This parameter just for Xen COLO */ 1396 object_property_add_str(obj, "notify_dev", 1397 compare_get_notify_dev, compare_set_notify_dev); 1398 1399 object_property_add(obj, "compare_timeout", "uint32", 1400 compare_get_timeout, 1401 compare_set_timeout, NULL, NULL); 1402 1403 object_property_add(obj, "expired_scan_cycle", "uint32", 1404 compare_get_expired_scan_cycle, 1405 compare_set_expired_scan_cycle, NULL, NULL); 1406 1407 object_property_add(obj, "max_queue_size", "uint32", 1408 get_max_queue_size, 1409 set_max_queue_size, NULL, NULL); 1410 1411 s->vnet_hdr = false; 1412 object_property_add_bool(obj, "vnet_hdr_support", compare_get_vnet_hdr, 1413 compare_set_vnet_hdr); 1414 } 1415 1416 static void colo_compare_finalize(Object *obj) 1417 { 1418 CompareState *s = COLO_COMPARE(obj); 1419 CompareState *tmp = NULL; 1420 1421 qemu_mutex_lock(&colo_compare_mutex); 1422 QTAILQ_FOREACH(tmp, &net_compares, next) { 1423 if (tmp == s) { 1424 QTAILQ_REMOVE(&net_compares, s, next); 1425 break; 1426 } 1427 } 1428 if (QTAILQ_EMPTY(&net_compares)) { 1429 colo_compare_active = false; 1430 qemu_mutex_destroy(&event_mtx); 1431 qemu_cond_destroy(&event_complete_cond); 1432 } 1433 qemu_mutex_unlock(&colo_compare_mutex); 1434 1435 qemu_chr_fe_deinit(&s->chr_pri_in, false); 1436 qemu_chr_fe_deinit(&s->chr_sec_in, false); 1437 qemu_chr_fe_deinit(&s->chr_out, false); 1438 if (s->notify_dev) { 1439 qemu_chr_fe_deinit(&s->chr_notify_dev, false); 1440 } 1441 1442 colo_compare_timer_del(s); 1443 1444 qemu_bh_delete(s->event_bh); 1445 1446 AioContext *ctx = iothread_get_aio_context(s->iothread); 1447 aio_context_acquire(ctx); 1448 AIO_WAIT_WHILE(ctx, !s->out_sendco.done); 1449 if (s->notify_dev) { 1450 AIO_WAIT_WHILE(ctx, !s->notify_sendco.done); 1451 } 1452 aio_context_release(ctx); 1453 1454 /* Release all unhandled packets after compare thead exited */ 1455 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 1456 AIO_WAIT_WHILE(NULL, !s->out_sendco.done); 1457 1458 g_queue_clear(&s->conn_list); 1459 g_queue_clear(&s->out_sendco.send_list); 1460 if (s->notify_dev) { 1461 g_queue_clear(&s->notify_sendco.send_list); 1462 } 1463 1464 if (s->connection_track_table) { 1465 g_hash_table_destroy(s->connection_track_table); 1466 } 1467 1468 object_unref(OBJECT(s->iothread)); 1469 1470 g_free(s->pri_indev); 1471 g_free(s->sec_indev); 1472 g_free(s->outdev); 1473 g_free(s->notify_dev); 1474 } 1475 1476 static void __attribute__((__constructor__)) colo_compare_init_globals(void) 1477 { 1478 colo_compare_active = false; 1479 qemu_mutex_init(&colo_compare_mutex); 1480 } 1481 1482 static const TypeInfo colo_compare_info = { 1483 .name = TYPE_COLO_COMPARE, 1484 .parent = TYPE_OBJECT, 1485 .instance_size = sizeof(CompareState), 1486 .instance_init = colo_compare_init, 1487 .instance_finalize = colo_compare_finalize, 1488 .class_size = sizeof(CompareClass), 1489 .class_init = colo_compare_class_init, 1490 .interfaces = (InterfaceInfo[]) { 1491 { TYPE_USER_CREATABLE }, 1492 { } 1493 } 1494 }; 1495 1496 static void register_types(void) 1497 { 1498 type_register_static(&colo_compare_info); 1499 } 1500 1501 type_init(register_types); 1502