net/colo-compare.c

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