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