Example #1
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 #2
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;
}