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 "qemu-common.h" 19 #include "qapi/qmp/qerror.h" 20 #include "qapi/error.h" 21 #include "net/net.h" 22 #include "net/eth.h" 23 #include "qom/object_interfaces.h" 24 #include "qemu/iov.h" 25 #include "qom/object.h" 26 #include "qemu/typedefs.h" 27 #include "net/queue.h" 28 #include "sysemu/char.h" 29 #include "qemu/sockets.h" 30 #include "qapi-visit.h" 31 #include "net/colo.h" 32 33 #define TYPE_COLO_COMPARE "colo-compare" 34 #define COLO_COMPARE(obj) \ 35 OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE) 36 37 #define COMPARE_READ_LEN_MAX NET_BUFSIZE 38 #define MAX_QUEUE_SIZE 1024 39 40 /* TODO: Should be configurable */ 41 #define REGULAR_PACKET_CHECK_MS 3000 42 43 /* 44 + CompareState ++ 45 | | 46 +---------------+ +---------------+ +---------------+ 47 |conn list +--->conn +--------->conn | 48 +---------------+ +---------------+ +---------------+ 49 | | | | | | 50 +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ 51 |primary | |secondary |primary | |secondary 52 |packet | |packet + |packet | |packet + 53 +--------+ +--------+ +--------+ +--------+ 54 | | | | 55 +---v----+ +---v----+ +---v----+ +---v----+ 56 |primary | |secondary |primary | |secondary 57 |packet | |packet + |packet | |packet + 58 +--------+ +--------+ +--------+ +--------+ 59 | | | | 60 +---v----+ +---v----+ +---v----+ +---v----+ 61 |primary | |secondary |primary | |secondary 62 |packet | |packet + |packet | |packet + 63 +--------+ +--------+ +--------+ +--------+ 64 */ 65 typedef struct CompareState { 66 Object parent; 67 68 char *pri_indev; 69 char *sec_indev; 70 char *outdev; 71 CharBackend chr_pri_in; 72 CharBackend chr_sec_in; 73 CharBackend chr_out; 74 SocketReadState pri_rs; 75 SocketReadState sec_rs; 76 77 /* connection list: the connections belonged to this NIC could be found 78 * in this list. 79 * element type: Connection 80 */ 81 GQueue conn_list; 82 /* hashtable to save connection */ 83 GHashTable *connection_track_table; 84 /* compare thread, a thread for each NIC */ 85 QemuThread thread; 86 87 GMainContext *worker_context; 88 GMainLoop *compare_loop; 89 } CompareState; 90 91 typedef struct CompareClass { 92 ObjectClass parent_class; 93 } CompareClass; 94 95 enum { 96 PRIMARY_IN = 0, 97 SECONDARY_IN, 98 }; 99 100 static int compare_chr_send(CharBackend *out, 101 const uint8_t *buf, 102 uint32_t size); 103 104 static gint seq_sorter(Packet *a, Packet *b, gpointer data) 105 { 106 struct tcphdr *atcp, *btcp; 107 108 atcp = (struct tcphdr *)(a->transport_header); 109 btcp = (struct tcphdr *)(b->transport_header); 110 return ntohl(atcp->th_seq) - ntohl(btcp->th_seq); 111 } 112 113 /* 114 * Return 0 on success, if return -1 means the pkt 115 * is unsupported(arp and ipv6) and will be sent later 116 */ 117 static int packet_enqueue(CompareState *s, int mode) 118 { 119 ConnectionKey key; 120 Packet *pkt = NULL; 121 Connection *conn; 122 123 if (mode == PRIMARY_IN) { 124 pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len); 125 } else { 126 pkt = packet_new(s->sec_rs.buf, s->sec_rs.packet_len); 127 } 128 129 if (parse_packet_early(pkt)) { 130 packet_destroy(pkt, NULL); 131 pkt = NULL; 132 return -1; 133 } 134 fill_connection_key(pkt, &key); 135 136 conn = connection_get(s->connection_track_table, 137 &key, 138 &s->conn_list); 139 140 if (!conn->processing) { 141 g_queue_push_tail(&s->conn_list, conn); 142 conn->processing = true; 143 } 144 145 if (mode == PRIMARY_IN) { 146 if (g_queue_get_length(&conn->primary_list) <= 147 MAX_QUEUE_SIZE) { 148 g_queue_push_tail(&conn->primary_list, pkt); 149 if (conn->ip_proto == IPPROTO_TCP) { 150 g_queue_sort(&conn->primary_list, 151 (GCompareDataFunc)seq_sorter, 152 NULL); 153 } 154 } else { 155 error_report("colo compare primary queue size too big," 156 "drop packet"); 157 } 158 } else { 159 if (g_queue_get_length(&conn->secondary_list) <= 160 MAX_QUEUE_SIZE) { 161 g_queue_push_tail(&conn->secondary_list, pkt); 162 if (conn->ip_proto == IPPROTO_TCP) { 163 g_queue_sort(&conn->secondary_list, 164 (GCompareDataFunc)seq_sorter, 165 NULL); 166 } 167 } else { 168 error_report("colo compare secondary queue size too big," 169 "drop packet"); 170 } 171 } 172 173 return 0; 174 } 175 176 /* 177 * The IP packets sent by primary and secondary 178 * will be compared in here 179 * TODO support ip fragment, Out-Of-Order 180 * return: 0 means packet same 181 * > 0 || < 0 means packet different 182 */ 183 static int colo_packet_compare_common(Packet *ppkt, Packet *spkt, int offset) 184 { 185 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 186 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 187 188 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 189 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 190 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 191 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 192 193 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 194 pri_ip_dst, spkt->size, 195 sec_ip_src, sec_ip_dst); 196 } 197 198 if (ppkt->size == spkt->size) { 199 return memcmp(ppkt->data + offset, spkt->data + offset, 200 spkt->size - offset); 201 } else { 202 trace_colo_compare_main("Net packet size are not the same"); 203 return -1; 204 } 205 } 206 207 /* 208 * Called from the compare thread on the primary 209 * for compare tcp packet 210 * compare_tcp copied from Dr. David Alan Gilbert's branch 211 */ 212 static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt) 213 { 214 struct tcphdr *ptcp, *stcp; 215 int res; 216 217 trace_colo_compare_main("compare tcp"); 218 219 ptcp = (struct tcphdr *)ppkt->transport_header; 220 stcp = (struct tcphdr *)spkt->transport_header; 221 222 /* 223 * The 'identification' field in the IP header is *very* random 224 * it almost never matches. Fudge this by ignoring differences in 225 * unfragmented packets; they'll normally sort themselves out if different 226 * anyway, and it should recover at the TCP level. 227 * An alternative would be to get both the primary and secondary to rewrite 228 * somehow; but that would need some sync traffic to sync the state 229 */ 230 if (ntohs(ppkt->ip->ip_off) & IP_DF) { 231 spkt->ip->ip_id = ppkt->ip->ip_id; 232 /* and the sum will be different if the IDs were different */ 233 spkt->ip->ip_sum = ppkt->ip->ip_sum; 234 } 235 236 if (ptcp->th_sum == stcp->th_sum) { 237 res = colo_packet_compare_common(ppkt, spkt, ETH_HLEN); 238 } else { 239 res = -1; 240 } 241 242 if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 243 trace_colo_compare_pkt_info_src(inet_ntoa(ppkt->ip->ip_src), 244 ntohl(stcp->th_seq), 245 ntohl(stcp->th_ack), 246 res, stcp->th_flags, 247 spkt->size); 248 249 trace_colo_compare_pkt_info_dst(inet_ntoa(ppkt->ip->ip_dst), 250 ntohl(ptcp->th_seq), 251 ntohl(ptcp->th_ack), 252 res, ptcp->th_flags, 253 ppkt->size); 254 255 qemu_hexdump((char *)ppkt->data, stderr, 256 "colo-compare ppkt", ppkt->size); 257 qemu_hexdump((char *)spkt->data, stderr, 258 "colo-compare spkt", spkt->size); 259 } 260 261 return res; 262 } 263 264 /* 265 * Called from the compare thread on the primary 266 * for compare udp packet 267 */ 268 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 269 { 270 int ret; 271 int network_header_length = ppkt->ip->ip_hl * 4; 272 273 trace_colo_compare_main("compare udp"); 274 275 /* 276 * Because of ppkt and spkt are both in the same connection, 277 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 278 * same with spkt. In addition, IP header's Identification is a random 279 * field, we can handle it in IP fragmentation function later. 280 * COLO just concern the response net packet payload from primary guest 281 * and secondary guest are same or not, So we ignored all IP header include 282 * other field like TOS,TTL,IP Checksum. we only need to compare 283 * the ip payload here. 284 */ 285 ret = colo_packet_compare_common(ppkt, spkt, 286 network_header_length + ETH_HLEN); 287 288 if (ret) { 289 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 290 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 291 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 292 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 293 ppkt->size); 294 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 295 spkt->size); 296 } 297 } 298 299 return ret; 300 } 301 302 /* 303 * Called from the compare thread on the primary 304 * for compare icmp packet 305 */ 306 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 307 { 308 int network_header_length = ppkt->ip->ip_hl * 4; 309 310 trace_colo_compare_main("compare icmp"); 311 312 /* 313 * Because of ppkt and spkt are both in the same connection, 314 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 315 * same with spkt. In addition, IP header's Identification is a random 316 * field, we can handle it in IP fragmentation function later. 317 * COLO just concern the response net packet payload from primary guest 318 * and secondary guest are same or not, So we ignored all IP header include 319 * other field like TOS,TTL,IP Checksum. we only need to compare 320 * the ip payload here. 321 */ 322 if (colo_packet_compare_common(ppkt, spkt, 323 network_header_length + ETH_HLEN)) { 324 trace_colo_compare_icmp_miscompare("primary pkt size", 325 ppkt->size); 326 trace_colo_compare_icmp_miscompare("Secondary pkt size", 327 spkt->size); 328 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 329 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 330 ppkt->size); 331 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 332 spkt->size); 333 } 334 return -1; 335 } else { 336 return 0; 337 } 338 } 339 340 /* 341 * Called from the compare thread on the primary 342 * for compare other packet 343 */ 344 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 345 { 346 trace_colo_compare_main("compare other"); 347 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 348 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 349 350 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 351 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 352 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 353 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 354 355 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 356 pri_ip_dst, spkt->size, 357 sec_ip_src, sec_ip_dst); 358 } 359 360 return colo_packet_compare_common(ppkt, spkt, 0); 361 } 362 363 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 364 { 365 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 366 367 if ((now - pkt->creation_ms) > (*check_time)) { 368 trace_colo_old_packet_check_found(pkt->creation_ms); 369 return 0; 370 } else { 371 return 1; 372 } 373 } 374 375 static void colo_old_packet_check_one_conn(void *opaque, 376 void *user_data) 377 { 378 Connection *conn = opaque; 379 GList *result = NULL; 380 int64_t check_time = REGULAR_PACKET_CHECK_MS; 381 382 result = g_queue_find_custom(&conn->primary_list, 383 &check_time, 384 (GCompareFunc)colo_old_packet_check_one); 385 386 if (result) { 387 /* do checkpoint will flush old packet */ 388 /* TODO: colo_notify_checkpoint();*/ 389 } 390 } 391 392 /* 393 * Look for old packets that the secondary hasn't matched, 394 * if we have some then we have to checkpoint to wake 395 * the secondary up. 396 */ 397 static void colo_old_packet_check(void *opaque) 398 { 399 CompareState *s = opaque; 400 401 g_queue_foreach(&s->conn_list, colo_old_packet_check_one_conn, NULL); 402 } 403 404 /* 405 * Called from the compare thread on the primary 406 * for compare connection 407 */ 408 static void colo_compare_connection(void *opaque, void *user_data) 409 { 410 CompareState *s = user_data; 411 Connection *conn = opaque; 412 Packet *pkt = NULL; 413 GList *result = NULL; 414 int ret; 415 416 while (!g_queue_is_empty(&conn->primary_list) && 417 !g_queue_is_empty(&conn->secondary_list)) { 418 pkt = g_queue_pop_tail(&conn->primary_list); 419 switch (conn->ip_proto) { 420 case IPPROTO_TCP: 421 result = g_queue_find_custom(&conn->secondary_list, 422 pkt, (GCompareFunc)colo_packet_compare_tcp); 423 break; 424 case IPPROTO_UDP: 425 result = g_queue_find_custom(&conn->secondary_list, 426 pkt, (GCompareFunc)colo_packet_compare_udp); 427 break; 428 case IPPROTO_ICMP: 429 result = g_queue_find_custom(&conn->secondary_list, 430 pkt, (GCompareFunc)colo_packet_compare_icmp); 431 break; 432 default: 433 result = g_queue_find_custom(&conn->secondary_list, 434 pkt, (GCompareFunc)colo_packet_compare_other); 435 break; 436 } 437 438 if (result) { 439 ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size); 440 if (ret < 0) { 441 error_report("colo_send_primary_packet failed"); 442 } 443 trace_colo_compare_main("packet same and release packet"); 444 g_queue_remove(&conn->secondary_list, result->data); 445 packet_destroy(pkt, NULL); 446 } else { 447 /* 448 * If one packet arrive late, the secondary_list or 449 * primary_list will be empty, so we can't compare it 450 * until next comparison. 451 */ 452 trace_colo_compare_main("packet different"); 453 g_queue_push_tail(&conn->primary_list, pkt); 454 /* TODO: colo_notify_checkpoint();*/ 455 break; 456 } 457 } 458 } 459 460 static int compare_chr_send(CharBackend *out, 461 const uint8_t *buf, 462 uint32_t size) 463 { 464 int ret = 0; 465 uint32_t len = htonl(size); 466 467 if (!size) { 468 return 0; 469 } 470 471 ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len)); 472 if (ret != sizeof(len)) { 473 goto err; 474 } 475 476 ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size); 477 if (ret != size) { 478 goto err; 479 } 480 481 return 0; 482 483 err: 484 return ret < 0 ? ret : -EIO; 485 } 486 487 static int compare_chr_can_read(void *opaque) 488 { 489 return COMPARE_READ_LEN_MAX; 490 } 491 492 /* 493 * Called from the main thread on the primary for packets 494 * arriving over the socket from the primary. 495 */ 496 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 497 { 498 CompareState *s = COLO_COMPARE(opaque); 499 int ret; 500 501 ret = net_fill_rstate(&s->pri_rs, buf, size); 502 if (ret == -1) { 503 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, 504 NULL, NULL, true); 505 error_report("colo-compare primary_in error"); 506 } 507 } 508 509 /* 510 * Called from the main thread on the primary for packets 511 * arriving over the socket from the secondary. 512 */ 513 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 514 { 515 CompareState *s = COLO_COMPARE(opaque); 516 int ret; 517 518 ret = net_fill_rstate(&s->sec_rs, buf, size); 519 if (ret == -1) { 520 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, 521 NULL, NULL, true); 522 error_report("colo-compare secondary_in error"); 523 } 524 } 525 526 /* 527 * Check old packet regularly so it can watch for any packets 528 * that the secondary hasn't produced equivalents of. 529 */ 530 static gboolean check_old_packet_regular(void *opaque) 531 { 532 CompareState *s = opaque; 533 534 /* if have old packet we will notify checkpoint */ 535 colo_old_packet_check(s); 536 537 return TRUE; 538 } 539 540 static void *colo_compare_thread(void *opaque) 541 { 542 CompareState *s = opaque; 543 GSource *timeout_source; 544 545 s->worker_context = g_main_context_new(); 546 547 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 548 compare_pri_chr_in, NULL, s, s->worker_context, true); 549 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 550 compare_sec_chr_in, NULL, s, s->worker_context, true); 551 552 s->compare_loop = g_main_loop_new(s->worker_context, FALSE); 553 554 /* To kick any packets that the secondary doesn't match */ 555 timeout_source = g_timeout_source_new(REGULAR_PACKET_CHECK_MS); 556 g_source_set_callback(timeout_source, 557 (GSourceFunc)check_old_packet_regular, s, NULL); 558 g_source_attach(timeout_source, s->worker_context); 559 560 g_main_loop_run(s->compare_loop); 561 562 g_source_unref(timeout_source); 563 g_main_loop_unref(s->compare_loop); 564 g_main_context_unref(s->worker_context); 565 return NULL; 566 } 567 568 static char *compare_get_pri_indev(Object *obj, Error **errp) 569 { 570 CompareState *s = COLO_COMPARE(obj); 571 572 return g_strdup(s->pri_indev); 573 } 574 575 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 576 { 577 CompareState *s = COLO_COMPARE(obj); 578 579 g_free(s->pri_indev); 580 s->pri_indev = g_strdup(value); 581 } 582 583 static char *compare_get_sec_indev(Object *obj, Error **errp) 584 { 585 CompareState *s = COLO_COMPARE(obj); 586 587 return g_strdup(s->sec_indev); 588 } 589 590 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 591 { 592 CompareState *s = COLO_COMPARE(obj); 593 594 g_free(s->sec_indev); 595 s->sec_indev = g_strdup(value); 596 } 597 598 static char *compare_get_outdev(Object *obj, Error **errp) 599 { 600 CompareState *s = COLO_COMPARE(obj); 601 602 return g_strdup(s->outdev); 603 } 604 605 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 606 { 607 CompareState *s = COLO_COMPARE(obj); 608 609 g_free(s->outdev); 610 s->outdev = g_strdup(value); 611 } 612 613 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 614 { 615 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 616 617 if (packet_enqueue(s, PRIMARY_IN)) { 618 trace_colo_compare_main("primary: unsupported packet in"); 619 compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len); 620 } else { 621 /* compare connection */ 622 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 623 } 624 } 625 626 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 627 { 628 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 629 630 if (packet_enqueue(s, SECONDARY_IN)) { 631 trace_colo_compare_main("secondary: unsupported packet in"); 632 } else { 633 /* compare connection */ 634 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 635 } 636 } 637 638 639 /* 640 * Return 0 is success. 641 * Return 1 is failed. 642 */ 643 static int find_and_check_chardev(Chardev **chr, 644 char *chr_name, 645 Error **errp) 646 { 647 *chr = qemu_chr_find(chr_name); 648 if (*chr == NULL) { 649 error_setg(errp, "Device '%s' not found", 650 chr_name); 651 return 1; 652 } 653 654 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 655 error_setg(errp, "chardev \"%s\" is not reconnectable", 656 chr_name); 657 return 1; 658 } 659 660 return 0; 661 } 662 663 /* 664 * Called from the main thread on the primary 665 * to setup colo-compare. 666 */ 667 static void colo_compare_complete(UserCreatable *uc, Error **errp) 668 { 669 CompareState *s = COLO_COMPARE(uc); 670 Chardev *chr; 671 char thread_name[64]; 672 static int compare_id; 673 674 if (!s->pri_indev || !s->sec_indev || !s->outdev) { 675 error_setg(errp, "colo compare needs 'primary_in' ," 676 "'secondary_in','outdev' property set"); 677 return; 678 } else if (!strcmp(s->pri_indev, s->outdev) || 679 !strcmp(s->sec_indev, s->outdev) || 680 !strcmp(s->pri_indev, s->sec_indev)) { 681 error_setg(errp, "'indev' and 'outdev' could not be same " 682 "for compare module"); 683 return; 684 } 685 686 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 687 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 688 return; 689 } 690 691 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 692 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 693 return; 694 } 695 696 if (find_and_check_chardev(&chr, s->outdev, errp) || 697 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 698 return; 699 } 700 701 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize); 702 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize); 703 704 g_queue_init(&s->conn_list); 705 706 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 707 connection_key_equal, 708 g_free, 709 connection_destroy); 710 711 sprintf(thread_name, "colo-compare %d", compare_id); 712 qemu_thread_create(&s->thread, thread_name, 713 colo_compare_thread, s, 714 QEMU_THREAD_JOINABLE); 715 compare_id++; 716 717 return; 718 } 719 720 static void colo_flush_packets(void *opaque, void *user_data) 721 { 722 CompareState *s = user_data; 723 Connection *conn = opaque; 724 Packet *pkt = NULL; 725 726 while (!g_queue_is_empty(&conn->primary_list)) { 727 pkt = g_queue_pop_head(&conn->primary_list); 728 compare_chr_send(&s->chr_out, pkt->data, pkt->size); 729 packet_destroy(pkt, NULL); 730 } 731 while (!g_queue_is_empty(&conn->secondary_list)) { 732 pkt = g_queue_pop_head(&conn->secondary_list); 733 packet_destroy(pkt, NULL); 734 } 735 } 736 737 static void colo_compare_class_init(ObjectClass *oc, void *data) 738 { 739 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 740 741 ucc->complete = colo_compare_complete; 742 } 743 744 static void colo_compare_init(Object *obj) 745 { 746 object_property_add_str(obj, "primary_in", 747 compare_get_pri_indev, compare_set_pri_indev, 748 NULL); 749 object_property_add_str(obj, "secondary_in", 750 compare_get_sec_indev, compare_set_sec_indev, 751 NULL); 752 object_property_add_str(obj, "outdev", 753 compare_get_outdev, compare_set_outdev, 754 NULL); 755 } 756 757 static void colo_compare_finalize(Object *obj) 758 { 759 CompareState *s = COLO_COMPARE(obj); 760 761 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 762 s->worker_context, true); 763 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 764 s->worker_context, true); 765 qemu_chr_fe_deinit(&s->chr_out); 766 767 g_main_loop_quit(s->compare_loop); 768 qemu_thread_join(&s->thread); 769 770 /* Release all unhandled packets after compare thead exited */ 771 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 772 773 g_queue_clear(&s->conn_list); 774 775 g_hash_table_destroy(s->connection_track_table); 776 g_free(s->pri_indev); 777 g_free(s->sec_indev); 778 g_free(s->outdev); 779 } 780 781 static const TypeInfo colo_compare_info = { 782 .name = TYPE_COLO_COMPARE, 783 .parent = TYPE_OBJECT, 784 .instance_size = sizeof(CompareState), 785 .instance_init = colo_compare_init, 786 .instance_finalize = colo_compare_finalize, 787 .class_size = sizeof(CompareClass), 788 .class_init = colo_compare_class_init, 789 .interfaces = (InterfaceInfo[]) { 790 { TYPE_USER_CREATABLE }, 791 { } 792 } 793 }; 794 795 static void register_types(void) 796 { 797 type_register_static(&colo_compare_info); 798 } 799 800 type_init(register_types); 801