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