Beispiel #1
0
/* Context: QEMU global mutex held */
void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
                                  VirtIOBlockDataPlane **dataplane,
                                  Error **errp)
{
    VirtIOBlockDataPlane *s;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    *dataplane = NULL;

    if (!conf->iothread) {
        return;
    }

    /* Don't try if transport does not support notifiers. */
    if (!k->set_guest_notifiers || !k->set_host_notifier) {
        error_setg(errp,
                   "device is incompatible with dataplane "
                   "(transport does not support notifiers)");
        return;
    }

    /* If dataplane is (re-)enabled while the guest is running there could be
     * block jobs that can conflict.
     */
    if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
        error_prepend(errp, "cannot start dataplane thread: ");
        return;
    }

    s = g_new0(VirtIOBlockDataPlane, 1);
    s->vdev = vdev;
    s->conf = conf;

    if (conf->iothread) {
        s->iothread = conf->iothread;
        object_ref(OBJECT(s->iothread));
    }
    s->ctx = iothread_get_aio_context(s->iothread);
    s->bh = aio_bh_new(s->ctx, notify_guest_bh, s);

    error_setg(&s->blocker, "block device is in use by data plane");
    blk_op_block_all(conf->conf.blk, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
                   s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker);

    *dataplane = s;
}
Beispiel #2
0
/* Context: QEMU global mutex held */
void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
                                  VirtIOBlockDataPlane **dataplane,
                                  Error **errp)
{
    VirtIOBlockDataPlane *s;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    *dataplane = NULL;

    if (!conf->iothread) {
        return;
    }

    /* Don't try if transport does not support notifiers. */
    if (!k->set_guest_notifiers || !k->set_host_notifier) {
        error_setg(errp,
                   "device is incompatible with dataplane "
                   "(transport does not support notifiers)");
        return;
    }

    /* If dataplane is (re-)enabled while the guest is running there could be
     * block jobs that can conflict.
     */
    if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
        error_prepend(errp, "cannot start dataplane thread: ");
        return;
    }

    s = g_new0(VirtIOBlockDataPlane, 1);
    s->vdev = vdev;
    s->conf = conf;

    if (conf->iothread) {
        s->iothread = conf->iothread;
        object_ref(OBJECT(s->iothread));
    }
    s->ctx = iothread_get_aio_context(s->iothread);
    s->bh = aio_bh_new(s->ctx, notify_guest_bh, s);

    s->insert_notifier.notify = data_plane_blk_insert_notifier;
    s->remove_notifier.notify = data_plane_blk_remove_notifier;
    blk_add_insert_bs_notifier(conf->conf.blk, &s->insert_notifier);
    blk_add_remove_bs_notifier(conf->conf.blk, &s->remove_notifier);

    data_plane_set_up_op_blockers(s);

    *dataplane = s;
}
Beispiel #3
0
/* Context: QEMU global mutex held */
void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
                                  VirtIOBlockDataPlane **dataplane,
                                  Error **errp)
{
    VirtIOBlockDataPlane *s;
    Error *local_err = NULL;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    *dataplane = NULL;

    if (!conf->data_plane && !conf->iothread) {
        return;
    }

    /* Don't try if transport does not support notifiers. */
    if (!k->set_guest_notifiers || !k->set_host_notifier) {
        error_setg(errp,
                   "device is incompatible with x-data-plane "
                   "(transport does not support notifiers)");
        return;
    }

    /* If dataplane is (re-)enabled while the guest is running there could be
     * block jobs that can conflict.
     */
    if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE,
                          &local_err)) {
        error_setg(errp, "cannot start dataplane thread: %s",
                   error_get_pretty(local_err));
        error_free(local_err);
        return;
    }

    s = g_new0(VirtIOBlockDataPlane, 1);
    s->vdev = vdev;
    s->conf = conf;

    if (conf->iothread) {
        s->iothread = conf->iothread;
        object_ref(OBJECT(s->iothread));
    } else {
        /* Create per-device IOThread if none specified.  This is for
         * x-data-plane option compatibility.  If x-data-plane is removed we
         * can drop this.
         */
        object_initialize(&s->internal_iothread_obj,
                          sizeof(s->internal_iothread_obj),
                          TYPE_IOTHREAD);
        user_creatable_complete(OBJECT(&s->internal_iothread_obj), &error_abort);
        s->iothread = &s->internal_iothread_obj;
    }
    s->ctx = iothread_get_aio_context(s->iothread);
    s->bh = aio_bh_new(s->ctx, notify_guest_bh, s);

    error_setg(&s->blocker, "block device is in use by data plane");
    blk_op_block_all(conf->conf.blk, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
                   s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker);

    *dataplane = s;
}
Beispiel #4
0
static void handle_notify(EventNotifier *e)
{
    VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane,
                                           host_notifier);
    VirtIOBlock *vblk = VIRTIO_BLK(s->vdev);

    event_notifier_test_and_clear(&s->host_notifier);
    blk_io_plug(s->conf->conf.blk);
    for (;;) {
        MultiReqBuffer mrb = {
            .num_writes = 0,
        };
        int ret;

        /* Disable guest->host notifies to avoid unnecessary vmexits */
        vring_disable_notification(s->vdev, &s->vring);

        for (;;) {
            VirtIOBlockReq *req = virtio_blk_alloc_request(vblk);

            ret = vring_pop(s->vdev, &s->vring, &req->elem);
            if (ret < 0) {
                virtio_blk_free_request(req);
                break; /* no more requests */
            }

            trace_virtio_blk_data_plane_process_request(s, req->elem.out_num,
                                                        req->elem.in_num,
                                                        req->elem.index);

            virtio_blk_handle_request(req, &mrb);
        }

        virtio_submit_multiwrite(s->conf->conf.blk, &mrb);

        if (likely(ret == -EAGAIN)) { /* vring emptied */
            /* Re-enable guest->host notifies and stop processing the vring.
             * But if the guest has snuck in more descriptors, keep processing.
             */
            if (vring_enable_notification(s->vdev, &s->vring)) {
                break;
            }
        } else { /* fatal error */
            break;
        }
    }
    blk_io_unplug(s->conf->conf.blk);
}

/* Context: QEMU global mutex held */
void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
                                  VirtIOBlockDataPlane **dataplane,
                                  Error **errp)
{
    VirtIOBlockDataPlane *s;
    Error *local_err = NULL;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    *dataplane = NULL;

    if (!conf->data_plane && !conf->iothread) {
        return;
    }

    /* Don't try if transport does not support notifiers. */
    if (!k->set_guest_notifiers || !k->set_host_notifier) {
        error_setg(errp,
                   "device is incompatible with x-data-plane "
                   "(transport does not support notifiers)");
        return;
    }

    /* If dataplane is (re-)enabled while the guest is running there could be
     * block jobs that can conflict.
     */
    if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE,
                          &local_err)) {
        error_setg(errp, "cannot start dataplane thread: %s",
                   error_get_pretty(local_err));
        error_free(local_err);
        return;
    }

    s = g_new0(VirtIOBlockDataPlane, 1);
    s->vdev = vdev;
    s->conf = conf;

    if (conf->iothread) {
        s->iothread = conf->iothread;
        object_ref(OBJECT(s->iothread));
    } else {
        /* Create per-device IOThread if none specified.  This is for
         * x-data-plane option compatibility.  If x-data-plane is removed we
         * can drop this.
         */
        object_initialize(&s->internal_iothread_obj,
                          sizeof(s->internal_iothread_obj),
                          TYPE_IOTHREAD);
        user_creatable_complete(OBJECT(&s->internal_iothread_obj), &error_abort);
        s->iothread = &s->internal_iothread_obj;
    }
    s->ctx = iothread_get_aio_context(s->iothread);
    s->bh = aio_bh_new(s->ctx, notify_guest_bh, s);

    error_setg(&s->blocker, "block device is in use by data plane");
    blk_op_block_all(conf->conf.blk, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker);

    *dataplane = s;
}