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(inet_ntoa(ppkt->ip->ip_src),
 222                                     inet_ntoa(ppkt->ip->ip_dst),
 223                                     ntohl(ptcp->th_seq),
 224                                     ntohl(ptcp->th_ack),
 225                                     ntohl(stcp->th_seq),
 226                                     ntohl(stcp->th_ack),
 227                                     res, ptcp->th_flags,
 228                                     stcp->th_flags,
 229                                     ppkt->size,
 230                                     spkt->size);
 231
 232         qemu_hexdump((char *)ppkt->data, stderr,
 233                      "colo-compare ppkt", ppkt->size);
 234         qemu_hexdump((char *)spkt->data, stderr,
 235                      "colo-compare spkt", spkt->size);
 236     }
 237
 238     return res;
 239 }
 240
 241 /*
 242  * Called from the compare thread on the primary
 243  * for compare udp packet
 244  */
 245 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt)
 246 {
 247     int ret;
 248
 249     trace_colo_compare_main("compare udp");
 250     ret = colo_packet_compare(ppkt, spkt);
 251
 252     if (ret) {
 253         trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size);
 254         qemu_hexdump((char *)ppkt->data, stderr, "colo-compare", ppkt->size);
 255         trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size);
 256         qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
 257     }
 258
 259     return ret;
 260 }
 261
 262 /*
 263  * Called from the compare thread on the primary
 264  * for compare icmp packet
 265  */
 266 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt)
 267 {
 268     int network_length;
 269
 270     trace_colo_compare_main("compare icmp");
 271     network_length = ppkt->ip->ip_hl * 4;
 272     if (ppkt->size != spkt->size ||
 273         ppkt->size < network_length + ETH_HLEN) {
 274         return -1;
 275     }
 276
 277     if (colo_packet_compare(ppkt, spkt)) {
 278         trace_colo_compare_icmp_miscompare("primary pkt size",
 279                                            ppkt->size);
 280         qemu_hexdump((char *)ppkt->data, stderr, "colo-compare",
 281                      ppkt->size);
 282         trace_colo_compare_icmp_miscompare("Secondary pkt size",
 283                                            spkt->size);
 284         qemu_hexdump((char *)spkt->data, stderr, "colo-compare",
 285                      spkt->size);
 286         return -1;
 287     } else {
 288         return 0;
 289     }
 290 }
 291
 292 /*
 293  * Called from the compare thread on the primary
 294  * for compare other packet
 295  */
 296 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt)
 297 {
 298     trace_colo_compare_main("compare other");
 299     trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
 300                                inet_ntoa(ppkt->ip->ip_dst), spkt->size,
 301                                inet_ntoa(spkt->ip->ip_src),
 302                                inet_ntoa(spkt->ip->ip_dst));
 303     return colo_packet_compare(ppkt, spkt);
 304 }
 305
 306 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time)
 307 {
 308     int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST);
 309
 310     if ((now - pkt->creation_ms) > (*check_time)) {
 311         trace_colo_old_packet_check_found(pkt->creation_ms);
 312         return 0;
 313     } else {
 314         return 1;
 315     }
 316 }
 317
 318 static void colo_old_packet_check_one_conn(void *opaque,
 319                                            void *user_data)
 320 {
 321     Connection *conn = opaque;
 322     GList *result = NULL;
 323     int64_t check_time = REGULAR_PACKET_CHECK_MS;
 324
 325     result = g_queue_find_custom(&conn->primary_list,
 326                                  &check_time,
 327                                  (GCompareFunc)colo_old_packet_check_one);
 328
 329     if (result) {
 330         /* do checkpoint will flush old packet */
 331         /* TODO: colo_notify_checkpoint();*/
 332     }
 333 }
 334
 335 /*
 336  * Look for old packets that the secondary hasn't matched,
 337  * if we have some then we have to checkpoint to wake
 338  * the secondary up.
 339  */
 340 static void colo_old_packet_check(void *opaque)
 341 {
 342     CompareState *s = opaque;
 343
 344     g_queue_foreach(&s->conn_list, colo_old_packet_check_one_conn, NULL);
 345 }
 346
 347 /*
 348  * Called from the compare thread on the primary
 349  * for compare connection
 350  */
 351 static void colo_compare_connection(void *opaque, void *user_data)
 352 {
 353     CompareState *s = user_data;
 354     Connection *conn = opaque;
 355     Packet *pkt = NULL;
 356     GList *result = NULL;
 357     int ret;
 358
 359     while (!g_queue_is_empty(&conn->primary_list) &&
 360            !g_queue_is_empty(&conn->secondary_list)) {
 361         qemu_mutex_lock(&s->timer_check_lock);
 362         pkt = g_queue_pop_tail(&conn->primary_list);
 363         qemu_mutex_unlock(&s->timer_check_lock);
 364         switch (conn->ip_proto) {
 365         case IPPROTO_TCP:
 366             result = g_queue_find_custom(&conn->secondary_list,
 367                      pkt, (GCompareFunc)colo_packet_compare_tcp);
 368             break;
 369         case IPPROTO_UDP:
 370             result = g_queue_find_custom(&conn->secondary_list,
 371                      pkt, (GCompareFunc)colo_packet_compare_udp);
 372             break;
 373         case IPPROTO_ICMP:
 374             result = g_queue_find_custom(&conn->secondary_list,
 375                      pkt, (GCompareFunc)colo_packet_compare_icmp);
 376             break;
 377         default:
 378             result = g_queue_find_custom(&conn->secondary_list,
 379                      pkt, (GCompareFunc)colo_packet_compare_other);
 380             break;
 381         }
 382
 383         if (result) {
 384             ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size);
 385             if (ret < 0) {
 386                 error_report("colo_send_primary_packet failed");
 387             }
 388             trace_colo_compare_main("packet same and release packet");
 389             g_queue_remove(&conn->secondary_list, result->data);
 390             packet_destroy(pkt, NULL);
 391         } else {
 392             /*
 393              * If one packet arrive late, the secondary_list or
 394              * primary_list will be empty, so we can't compare it
 395              * until next comparison.
 396              */
 397             trace_colo_compare_main("packet different");
 398             qemu_mutex_lock(&s->timer_check_lock);
 399             g_queue_push_tail(&conn->primary_list, pkt);
 400             qemu_mutex_unlock(&s->timer_check_lock);
 401             /* TODO: colo_notify_checkpoint();*/
 402             break;
 403         }
 404     }
 405 }
 406
 407 static int compare_chr_send(CharBackend *out,
 408                             const uint8_t *buf,
 409                             uint32_t size)
 410 {
 411     int ret = 0;
 412     uint32_t len = htonl(size);
 413
 414     if (!size) {
 415         return 0;
 416     }
 417
 418     ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len));
 419     if (ret != sizeof(len)) {
 420         goto err;
 421     }
 422
 423     ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size);
 424     if (ret != size) {
 425         goto err;
 426     }
 427
 428     return 0;
 429
 430 err:
 431     return ret < 0 ? ret : -EIO;
 432 }
 433
 434 static int compare_chr_can_read(void *opaque)
 435 {
 436     return COMPARE_READ_LEN_MAX;
 437 }
 438
 439 /*
 440  * Called from the main thread on the primary for packets
 441  * arriving over the socket from the primary.
 442  */
 443 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size)
 444 {
 445     CompareState *s = COLO_COMPARE(opaque);
 446     int ret;
 447
 448     ret = net_fill_rstate(&s->pri_rs, buf, size);
 449     if (ret == -1) {
 450         qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL,
 451                                  NULL, NULL, true);
 452         error_report("colo-compare primary_in error");
 453     }
 454 }
 455
 456 /*
 457  * Called from the main thread on the primary for packets
 458  * arriving over the socket from the secondary.
 459  */
 460 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size)
 461 {
 462     CompareState *s = COLO_COMPARE(opaque);
 463     int ret;
 464
 465     ret = net_fill_rstate(&s->sec_rs, buf, size);
 466     if (ret == -1) {
 467         qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL,
 468                                  NULL, NULL, true);
 469         error_report("colo-compare secondary_in error");
 470     }
 471 }
 472
 473 static void *colo_compare_thread(void *opaque)
 474 {
 475     GMainContext *worker_context;
 476     GMainLoop *compare_loop;
 477     CompareState *s = opaque;
 478
 479     worker_context = g_main_context_new();
 480
 481     qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read,
 482                              compare_pri_chr_in, NULL, s, worker_context, true);
 483     qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read,
 484                              compare_sec_chr_in, NULL, s, worker_context, true);
 485
 486     compare_loop = g_main_loop_new(worker_context, FALSE);
 487
 488     g_main_loop_run(compare_loop);
 489
 490     g_main_loop_unref(compare_loop);
 491     g_main_context_unref(worker_context);
 492     return NULL;
 493 }
 494
 495 static char *compare_get_pri_indev(Object *obj, Error **errp)
 496 {
 497     CompareState *s = COLO_COMPARE(obj);
 498
 499     return g_strdup(s->pri_indev);
 500 }
 501
 502 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp)
 503 {
 504     CompareState *s = COLO_COMPARE(obj);
 505
 506     g_free(s->pri_indev);
 507     s->pri_indev = g_strdup(value);
 508 }
 509
 510 static char *compare_get_sec_indev(Object *obj, Error **errp)
 511 {
 512     CompareState *s = COLO_COMPARE(obj);
 513
 514     return g_strdup(s->sec_indev);
 515 }
 516
 517 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp)
 518 {
 519     CompareState *s = COLO_COMPARE(obj);
 520
 521     g_free(s->sec_indev);
 522     s->sec_indev = g_strdup(value);
 523 }
 524
 525 static char *compare_get_outdev(Object *obj, Error **errp)
 526 {
 527     CompareState *s = COLO_COMPARE(obj);
 528
 529     return g_strdup(s->outdev);
 530 }
 531
 532 static void compare_set_outdev(Object *obj, const char *value, Error **errp)
 533 {
 534     CompareState *s = COLO_COMPARE(obj);
 535
 536     g_free(s->outdev);
 537     s->outdev = g_strdup(value);
 538 }
 539
 540 static void compare_pri_rs_finalize(SocketReadState *pri_rs)
 541 {
 542     CompareState *s = container_of(pri_rs, CompareState, pri_rs);
 543
 544     if (packet_enqueue(s, PRIMARY_IN)) {
 545         trace_colo_compare_main("primary: unsupported packet in");
 546         compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len);
 547     } else {
 548         /* compare connection */
 549         g_queue_foreach(&s->conn_list, colo_compare_connection, s);
 550     }
 551 }
 552
 553 static void compare_sec_rs_finalize(SocketReadState *sec_rs)
 554 {
 555     CompareState *s = container_of(sec_rs, CompareState, sec_rs);
 556
 557     if (packet_enqueue(s, SECONDARY_IN)) {
 558         trace_colo_compare_main("secondary: unsupported packet in");
 559     } else {
 560         /* compare connection */
 561         g_queue_foreach(&s->conn_list, colo_compare_connection, s);
 562     }
 563 }
 564
 565
 566 /*
 567  * Return 0 is success.
 568  * Return 1 is failed.
 569  */
 570 static int find_and_check_chardev(CharDriverState **chr,
 571                                   char *chr_name,
 572                                   Error **errp)
 573 {
 574     CompareChardevProps props;
 575
 576     *chr = qemu_chr_find(chr_name);
 577     if (*chr == NULL) {
 578         error_setg(errp, "Device '%s' not found",
 579                    chr_name);
 580         return 1;
 581     }
 582
 583     memset(&props, 0, sizeof(props));
 584
 585     if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) {
 586         error_setg(errp, "chardev \"%s\" is not reconnectable",
 587                    chr_name);
 588         return 1;
 589     }
 590
 591     return 0;
 592 }
 593
 594 /*
 595  * Check old packet regularly so it can watch for any packets
 596  * that the secondary hasn't produced equivalents of.
 597  */
 598 static void check_old_packet_regular(void *opaque)
 599 {
 600     CompareState *s = opaque;
 601
 602     timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
 603               REGULAR_PACKET_CHECK_MS);
 604     /* if have old packet we will notify checkpoint */
 605     /*
 606      * TODO: Make timer handler run in compare thread
 607      * like qemu_chr_add_handlers_full.
 608      */
 609     qemu_mutex_lock(&s->timer_check_lock);
 610     colo_old_packet_check(s);
 611     qemu_mutex_unlock(&s->timer_check_lock);
 612 }
 613
 614 /*
 615  * Called from the main thread on the primary
 616  * to setup colo-compare.
 617  */
 618 static void colo_compare_complete(UserCreatable *uc, Error **errp)
 619 {
 620     CompareState *s = COLO_COMPARE(uc);
 621     CharDriverState *chr;
 622     char thread_name[64];
 623     static int compare_id;
 624
 625     if (!s->pri_indev || !s->sec_indev || !s->outdev) {
 626         error_setg(errp, "colo compare needs 'primary_in' ,"
 627                    "'secondary_in','outdev' property set");
 628         return;
 629     } else if (!strcmp(s->pri_indev, s->outdev) ||
 630                !strcmp(s->sec_indev, s->outdev) ||
 631                !strcmp(s->pri_indev, s->sec_indev)) {
 632         error_setg(errp, "'indev' and 'outdev' could not be same "
 633                    "for compare module");
 634         return;
 635     }
 636
 637     if (find_and_check_chardev(&chr, s->pri_indev, errp) ||
 638         !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) {
 639         return;
 640     }
 641
 642     if (find_and_check_chardev(&chr, s->sec_indev, errp) ||
 643         !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) {
 644         return;
 645     }
 646
 647     if (find_and_check_chardev(&chr, s->outdev, errp) ||
 648         !qemu_chr_fe_init(&s->chr_out, chr, errp)) {
 649         return;
 650     }
 651
 652     net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize);
 653     net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize);
 654
 655     g_queue_init(&s->conn_list);
 656     qemu_mutex_init(&s->timer_check_lock);
 657
 658     s->connection_track_table = g_hash_table_new_full(connection_key_hash,
 659                                                       connection_key_equal,
 660                                                       g_free,
 661                                                       connection_destroy);
 662
 663     sprintf(thread_name, "colo-compare %d", compare_id);
 664     qemu_thread_create(&s->thread, thread_name,
 665                        colo_compare_thread, s,
 666                        QEMU_THREAD_JOINABLE);
 667     compare_id++;
 668
 669     /* A regular timer to kick any packets that the secondary doesn't match */
 670     s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, /* Only when guest runs */
 671                             check_old_packet_regular, s);
 672     timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
 673                         REGULAR_PACKET_CHECK_MS);
 674
 675     return;
 676 }
 677
 678 static void colo_compare_class_init(ObjectClass *oc, void *data)
 679 {
 680     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 681
 682     ucc->complete = colo_compare_complete;
 683 }
 684
 685 static void colo_compare_init(Object *obj)
 686 {
 687     object_property_add_str(obj, "primary_in",
 688                             compare_get_pri_indev, compare_set_pri_indev,
 689                             NULL);
 690     object_property_add_str(obj, "secondary_in",
 691                             compare_get_sec_indev, compare_set_sec_indev,
 692                             NULL);
 693     object_property_add_str(obj, "outdev",
 694                             compare_get_outdev, compare_set_outdev,
 695                             NULL);
 696 }
 697
 698 static void colo_compare_finalize(Object *obj)
 699 {
 700     CompareState *s = COLO_COMPARE(obj);
 701
 702     qemu_chr_fe_deinit(&s->chr_pri_in);
 703     qemu_chr_fe_deinit(&s->chr_sec_in);
 704     qemu_chr_fe_deinit(&s->chr_out);
 705
 706     g_queue_free(&s->conn_list);
 707
 708     if (qemu_thread_is_self(&s->thread)) {
 709         /* compare connection */
 710         g_queue_foreach(&s->conn_list, colo_compare_connection, s);
 711         qemu_thread_join(&s->thread);
 712     }
 713
 714     if (s->timer) {
 715         timer_del(s->timer);
 716     }
 717
 718     qemu_mutex_destroy(&s->timer_check_lock);
 719
 720     g_free(s->pri_indev);
 721     g_free(s->sec_indev);
 722     g_free(s->outdev);
 723 }
 724
 725 static const TypeInfo colo_compare_info = {
 726     .name = TYPE_COLO_COMPARE,
 727     .parent = TYPE_OBJECT,
 728     .instance_size = sizeof(CompareState),
 729     .instance_init = colo_compare_init,
 730     .instance_finalize = colo_compare_finalize,
 731     .class_size = sizeof(CompareClass),
 732     .class_init = colo_compare_class_init,
 733     .interfaces = (InterfaceInfo[]) {
 734         { TYPE_USER_CREATABLE },
 735         { }
 736     }
 737 };
 738
 739 static void register_types(void)
 740 {
 741     type_register_static(&colo_compare_info);
 742 }
 743
 744 type_init(register_types);