Example #1
0
File: colo.c Project: mmuman/qemu
static uint64_t colo_receive_message_value(QEMUFile *f, uint32_t expect_msg,
                                           Error **errp)
{
    Error *local_err = NULL;
    uint64_t value;
    int ret;

    colo_receive_check_message(f, expect_msg, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return 0;
    }

    value = qemu_get_be64(f);
    ret = qemu_file_get_error(f);
    if (ret < 0) {
        error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
                         COLOMessage_lookup[expect_msg]);
    }
    return value;
}
Example #2
0
File: colo.c Project: mmuman/qemu
void *colo_process_incoming_thread(void *opaque)
{
    MigrationIncomingState *mis = opaque;
    QEMUFile *fb = NULL;
    QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
    uint64_t total_size;
    uint64_t value;
    Error *local_err = NULL;

    qemu_sem_init(&mis->colo_incoming_sem, 0);

    migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
                      MIGRATION_STATUS_COLO);

    failover_init_state();

    mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
    if (!mis->to_src_file) {
        error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
        goto out;
    }
    /*
     * Note: the communication between Primary side and Secondary side
     * should be sequential, we set the fd to unblocked in migration incoming
     * coroutine, and here we are in the COLO incoming thread, so it is ok to
     * set the fd back to blocked.
     */
    qemu_file_set_blocking(mis->from_src_file, true);

    bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
    fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
    object_unref(OBJECT(bioc));

    colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
                      &local_err);
    if (local_err) {
        goto out;
    }

    while (mis->state == MIGRATION_STATUS_COLO) {
        int request = 0;

        colo_wait_handle_message(mis->from_src_file, &request, &local_err);
        if (local_err) {
            goto out;
        }
        assert(request);
        if (failover_get_state() != FAILOVER_STATUS_NONE) {
            error_report("failover request");
            goto out;
        }

        /* FIXME: This is unnecessary for periodic checkpoint mode */
        colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
                     &local_err);
        if (local_err) {
            goto out;
        }

        colo_receive_check_message(mis->from_src_file,
                           COLO_MESSAGE_VMSTATE_SEND, &local_err);
        if (local_err) {
            goto out;
        }

        value = colo_receive_message_value(mis->from_src_file,
                                 COLO_MESSAGE_VMSTATE_SIZE, &local_err);
        if (local_err) {
            goto out;
        }

        /*
         * Read VM device state data into channel buffer,
         * It's better to re-use the memory allocated.
         * Here we need to handle the channel buffer directly.
         */
        if (value > bioc->capacity) {
            bioc->capacity = value;
            bioc->data = g_realloc(bioc->data, bioc->capacity);
        }
        total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
        if (total_size != value) {
            error_report("Got %" PRIu64 " VMState data, less than expected"
                        " %" PRIu64, total_size, value);
            goto out;
        }
        bioc->usage = total_size;
        qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);

        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
                     &local_err);
        if (local_err) {
            goto out;
        }

        qemu_mutex_lock_iothread();
        qemu_system_reset(VMRESET_SILENT);
        vmstate_loading = true;
        if (qemu_loadvm_state(fb) < 0) {
            error_report("COLO: loadvm failed");
            qemu_mutex_unlock_iothread();
            goto out;
        }

        vmstate_loading = false;
        qemu_mutex_unlock_iothread();

        if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
            failover_set_state(FAILOVER_STATUS_RELAUNCH,
                            FAILOVER_STATUS_NONE);
            failover_request_active(NULL);
            goto out;
        }

        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
                     &local_err);
        if (local_err) {
            goto out;
        }
    }

out:
    vmstate_loading = false;
    /* Throw the unreported error message after exited from loop */
    if (local_err) {
        error_report_err(local_err);
    }

    if (fb) {
        qemu_fclose(fb);
    }

    /* Hope this not to be too long to loop here */
    qemu_sem_wait(&mis->colo_incoming_sem);
    qemu_sem_destroy(&mis->colo_incoming_sem);
    /* Must be called after failover BH is completed */
    if (mis->to_src_file) {
        qemu_fclose(mis->to_src_file);
    }
    migration_incoming_exit_colo();

    return NULL;
}
Example #3
0
File: colo.c Project: mmuman/qemu
static void colo_process_checkpoint(MigrationState *s)
{
    QIOChannelBuffer *bioc;
    QEMUFile *fb = NULL;
    int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
    Error *local_err = NULL;
    int ret;

    failover_init_state();

    s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
    if (!s->rp_state.from_dst_file) {
        error_report("Open QEMUFile from_dst_file failed");
        goto out;
    }

    /*
     * Wait for Secondary finish loading VM states and enter COLO
     * restore.
     */
    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_CHECKPOINT_READY, &local_err);
    if (local_err) {
        goto out;
    }
    bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
    fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
    object_unref(OBJECT(bioc));

    qemu_mutex_lock_iothread();
    vm_start();
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("stop", "run");

    timer_mod(s->colo_delay_timer,
            current_time + s->parameters.x_checkpoint_delay);

    while (s->state == MIGRATION_STATUS_COLO) {
        if (failover_get_state() != FAILOVER_STATUS_NONE) {
            error_report("failover request");
            goto out;
        }

        qemu_sem_wait(&s->colo_checkpoint_sem);

        ret = colo_do_checkpoint_transaction(s, bioc, fb);
        if (ret < 0) {
            goto out;
        }
    }

out:
    /* Throw the unreported error message after exited from loop */
    if (local_err) {
        error_report_err(local_err);
    }

    if (fb) {
        qemu_fclose(fb);
    }

    timer_del(s->colo_delay_timer);

    /* Hope this not to be too long to wait here */
    qemu_sem_wait(&s->colo_exit_sem);
    qemu_sem_destroy(&s->colo_exit_sem);
    /*
     * Must be called after failover BH is completed,
     * Or the failover BH may shutdown the wrong fd that
     * re-used by other threads after we release here.
     */
    if (s->rp_state.from_dst_file) {
        qemu_fclose(s->rp_state.from_dst_file);
    }
}
Example #4
0
File: colo.c Project: mmuman/qemu
static int colo_do_checkpoint_transaction(MigrationState *s,
                                          QIOChannelBuffer *bioc,
                                          QEMUFile *fb)
{
    Error *local_err = NULL;
    int ret = -1;

    colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
                      &local_err);
    if (local_err) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                    COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
    if (local_err) {
        goto out;
    }
    /* Reset channel-buffer directly */
    qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
    bioc->usage = 0;

    qemu_mutex_lock_iothread();
    if (failover_get_state() != FAILOVER_STATUS_NONE) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
    vm_stop_force_state(RUN_STATE_COLO);
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("run", "stop");
    /*
     * Failover request bh could be called after vm_stop_force_state(),
     * So we need check failover_request_is_active() again.
     */
    if (failover_get_state() != FAILOVER_STATUS_NONE) {
        goto out;
    }

    /* Disable block migration */
    s->params.blk = 0;
    s->params.shared = 0;
    qemu_savevm_state_header(fb);
    qemu_savevm_state_begin(fb, &s->params);
    qemu_mutex_lock_iothread();
    qemu_savevm_state_complete_precopy(fb, false);
    qemu_mutex_unlock_iothread();

    qemu_fflush(fb);

    colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
    if (local_err) {
        goto out;
    }
    /*
     * We need the size of the VMstate data in Secondary side,
     * With which we can decide how much data should be read.
     */
    colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
                            bioc->usage, &local_err);
    if (local_err) {
        goto out;
    }

    qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage);
    qemu_fflush(s->to_dst_file);
    ret = qemu_file_get_error(s->to_dst_file);
    if (ret < 0) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
    if (local_err) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_VMSTATE_LOADED, &local_err);
    if (local_err) {
        goto out;
    }

    ret = 0;

    qemu_mutex_lock_iothread();
    vm_start();
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("stop", "run");

out:
    if (local_err) {
        error_report_err(local_err);
    }
    return ret;
}
Example #5
0
File: colo.c Project: CTU-IIG/qemu
void *colo_process_incoming_thread(void *opaque)
{
    MigrationIncomingState *mis = opaque;
    QEMUFile *fb = NULL;
    QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
    uint64_t total_size;
    uint64_t value;
    Error *local_err = NULL;
    int ret;

    rcu_register_thread();
    qemu_sem_init(&mis->colo_incoming_sem, 0);

    migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
                      MIGRATION_STATUS_COLO);

    failover_init_state();

    mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
    if (!mis->to_src_file) {
        error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
        goto out;
    }
    /*
     * Note: the communication between Primary side and Secondary side
     * should be sequential, we set the fd to unblocked in migration incoming
     * coroutine, and here we are in the COLO incoming thread, so it is ok to
     * set the fd back to blocked.
     */
    qemu_file_set_blocking(mis->from_src_file, true);

    bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
    fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
    object_unref(OBJECT(bioc));

    qemu_mutex_lock_iothread();
#ifdef CONFIG_REPLICATION
    replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
    if (local_err) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
#else
        abort();
#endif
    vm_start();
    trace_colo_vm_state_change("stop", "run");
    qemu_mutex_unlock_iothread();

    colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
                      &local_err);
    if (local_err) {
        goto out;
    }

    while (mis->state == MIGRATION_STATUS_COLO) {
        int request = 0;

        colo_wait_handle_message(mis->from_src_file, &request, &local_err);
        if (local_err) {
            goto out;
        }
        assert(request);
        if (failover_get_state() != FAILOVER_STATUS_NONE) {
            error_report("failover request");
            goto out;
        }

        qemu_mutex_lock_iothread();
        vm_stop_force_state(RUN_STATE_COLO);
        trace_colo_vm_state_change("run", "stop");
        qemu_mutex_unlock_iothread();

        /* FIXME: This is unnecessary for periodic checkpoint mode */
        colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
                     &local_err);
        if (local_err) {
            goto out;
        }

        colo_receive_check_message(mis->from_src_file,
                           COLO_MESSAGE_VMSTATE_SEND, &local_err);
        if (local_err) {
            goto out;
        }

        qemu_mutex_lock_iothread();
        cpu_synchronize_all_pre_loadvm();
        ret = qemu_loadvm_state_main(mis->from_src_file, mis);
        qemu_mutex_unlock_iothread();

        if (ret < 0) {
            error_report("Load VM's live state (ram) error");
            goto out;
        }

        value = colo_receive_message_value(mis->from_src_file,
                                 COLO_MESSAGE_VMSTATE_SIZE, &local_err);
        if (local_err) {
            goto out;
        }

        /*
         * Read VM device state data into channel buffer,
         * It's better to re-use the memory allocated.
         * Here we need to handle the channel buffer directly.
         */
        if (value > bioc->capacity) {
            bioc->capacity = value;
            bioc->data = g_realloc(bioc->data, bioc->capacity);
        }
        total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
        if (total_size != value) {
            error_report("Got %" PRIu64 " VMState data, less than expected"
                        " %" PRIu64, total_size, value);
            goto out;
        }
        bioc->usage = total_size;
        qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);

        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
                     &local_err);
        if (local_err) {
            goto out;
        }

        qemu_mutex_lock_iothread();
        vmstate_loading = true;
        ret = qemu_load_device_state(fb);
        if (ret < 0) {
            error_report("COLO: load device state failed");
            qemu_mutex_unlock_iothread();
            goto out;
        }

#ifdef CONFIG_REPLICATION
        replication_get_error_all(&local_err);
        if (local_err) {
            qemu_mutex_unlock_iothread();
            goto out;
        }

        /* discard colo disk buffer */
        replication_do_checkpoint_all(&local_err);
        if (local_err) {
            qemu_mutex_unlock_iothread();
            goto out;
        }
#else
        abort();
#endif
        /* Notify all filters of all NIC to do checkpoint */
        colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);

        if (local_err) {
            qemu_mutex_unlock_iothread();
            goto out;
        }

        vmstate_loading = false;
        vm_start();
        trace_colo_vm_state_change("stop", "run");
        qemu_mutex_unlock_iothread();

        if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
            failover_set_state(FAILOVER_STATUS_RELAUNCH,
                            FAILOVER_STATUS_NONE);
            failover_request_active(NULL);
            goto out;
        }

        colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
                     &local_err);
        if (local_err) {
            goto out;
        }
    }

out:
    vmstate_loading = false;
    /* Throw the unreported error message after exited from loop */
    if (local_err) {
        error_report_err(local_err);
    }

    switch (failover_get_state()) {
    case FAILOVER_STATUS_NONE:
        qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
                                  COLO_EXIT_REASON_ERROR);
        break;
    case FAILOVER_STATUS_REQUIRE:
        qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
                                  COLO_EXIT_REASON_REQUEST);
        break;
    default:
        abort();
    }

    if (fb) {
        qemu_fclose(fb);
    }

    /* Hope this not to be too long to loop here */
    qemu_sem_wait(&mis->colo_incoming_sem);
    qemu_sem_destroy(&mis->colo_incoming_sem);
    /* Must be called after failover BH is completed */
    if (mis->to_src_file) {
        qemu_fclose(mis->to_src_file);
    }
    migration_incoming_disable_colo();

    rcu_unregister_thread();
    return NULL;
}
Example #6
0
File: colo.c Project: CTU-IIG/qemu
static void colo_process_checkpoint(MigrationState *s)
{
    QIOChannelBuffer *bioc;
    QEMUFile *fb = NULL;
    int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
    Error *local_err = NULL;
    int ret;

    failover_init_state();

    s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
    if (!s->rp_state.from_dst_file) {
        error_report("Open QEMUFile from_dst_file failed");
        goto out;
    }

    packets_compare_notifier.notify = colo_compare_notify_checkpoint;
    colo_compare_register_notifier(&packets_compare_notifier);

    /*
     * Wait for Secondary finish loading VM states and enter COLO
     * restore.
     */
    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_CHECKPOINT_READY, &local_err);
    if (local_err) {
        goto out;
    }
    bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
    fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
    object_unref(OBJECT(bioc));

    qemu_mutex_lock_iothread();
#ifdef CONFIG_REPLICATION
    replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
    if (local_err) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
#else
        abort();
#endif

    vm_start();
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("stop", "run");

    timer_mod(s->colo_delay_timer,
            current_time + s->parameters.x_checkpoint_delay);

    while (s->state == MIGRATION_STATUS_COLO) {
        if (failover_get_state() != FAILOVER_STATUS_NONE) {
            error_report("failover request");
            goto out;
        }

        qemu_sem_wait(&s->colo_checkpoint_sem);

        if (s->state != MIGRATION_STATUS_COLO) {
            goto out;
        }
        ret = colo_do_checkpoint_transaction(s, bioc, fb);
        if (ret < 0) {
            goto out;
        }
    }

out:
    /* Throw the unreported error message after exited from loop */
    if (local_err) {
        error_report_err(local_err);
    }

    if (fb) {
        qemu_fclose(fb);
    }

    /*
     * There are only two reasons we can get here, some error happened
     * or the user triggered failover.
     */
    switch (failover_get_state()) {
    case FAILOVER_STATUS_NONE:
        qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
                                  COLO_EXIT_REASON_ERROR);
        break;
    case FAILOVER_STATUS_REQUIRE:
        qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
                                  COLO_EXIT_REASON_REQUEST);
        break;
    default:
        abort();
    }

    /* Hope this not to be too long to wait here */
    qemu_sem_wait(&s->colo_exit_sem);
    qemu_sem_destroy(&s->colo_exit_sem);

    /*
     * It is safe to unregister notifier after failover finished.
     * Besides, colo_delay_timer and colo_checkpoint_sem can't be
     * released befor unregister notifier, or there will be use-after-free
     * error.
     */
    colo_compare_unregister_notifier(&packets_compare_notifier);
    timer_del(s->colo_delay_timer);
    timer_free(s->colo_delay_timer);
    qemu_sem_destroy(&s->colo_checkpoint_sem);

    /*
     * Must be called after failover BH is completed,
     * Or the failover BH may shutdown the wrong fd that
     * re-used by other threads after we release here.
     */
    if (s->rp_state.from_dst_file) {
        qemu_fclose(s->rp_state.from_dst_file);
    }
}
Example #7
0
File: colo.c Project: CTU-IIG/qemu
static int colo_do_checkpoint_transaction(MigrationState *s,
                                          QIOChannelBuffer *bioc,
                                          QEMUFile *fb)
{
    Error *local_err = NULL;
    int ret = -1;

    colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
                      &local_err);
    if (local_err) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                    COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
    if (local_err) {
        goto out;
    }
    /* Reset channel-buffer directly */
    qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
    bioc->usage = 0;

    qemu_mutex_lock_iothread();
    if (failover_get_state() != FAILOVER_STATUS_NONE) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
    vm_stop_force_state(RUN_STATE_COLO);
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("run", "stop");
    /*
     * Failover request bh could be called after vm_stop_force_state(),
     * So we need check failover_request_is_active() again.
     */
    if (failover_get_state() != FAILOVER_STATUS_NONE) {
        goto out;
    }

    colo_notify_compares_event(NULL, COLO_EVENT_CHECKPOINT, &local_err);
    if (local_err) {
        goto out;
    }

    /* Disable block migration */
    migrate_set_block_enabled(false, &local_err);
    qemu_mutex_lock_iothread();

#ifdef CONFIG_REPLICATION
    replication_do_checkpoint_all(&local_err);
    if (local_err) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
#else
        abort();
#endif

    colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
    if (local_err) {
        qemu_mutex_unlock_iothread();
        goto out;
    }
    /* Note: device state is saved into buffer */
    ret = qemu_save_device_state(fb);

    qemu_mutex_unlock_iothread();
    if (ret < 0) {
        goto out;
    }
    /*
     * Only save VM's live state, which not including device state.
     * TODO: We may need a timeout mechanism to prevent COLO process
     * to be blocked here.
     */
    qemu_savevm_live_state(s->to_dst_file);

    qemu_fflush(fb);

    /*
     * We need the size of the VMstate data in Secondary side,
     * With which we can decide how much data should be read.
     */
    colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
                            bioc->usage, &local_err);
    if (local_err) {
        goto out;
    }

    qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage);
    qemu_fflush(s->to_dst_file);
    ret = qemu_file_get_error(s->to_dst_file);
    if (ret < 0) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
    if (local_err) {
        goto out;
    }

    colo_receive_check_message(s->rp_state.from_dst_file,
                       COLO_MESSAGE_VMSTATE_LOADED, &local_err);
    if (local_err) {
        goto out;
    }

    ret = 0;

    qemu_mutex_lock_iothread();
    vm_start();
    qemu_mutex_unlock_iothread();
    trace_colo_vm_state_change("stop", "run");

out:
    if (local_err) {
        error_report_err(local_err);
    }
    return ret;
}