Commit 79cd0c80 authored by Cornelia Huck's avatar Cornelia Huck Committed by Michael S. Tsirkin
Browse files

virtio-ccw: support ring size changes 



Wire up changing the ring size for virtio-1 devices.

Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 46c5d082

hw/s390x/virtio-ccw.c

+10 −3
Original line number Diff line number Diff line
@@ -307,11 +307,18 @@ static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 
    if (!desc) {

        virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR);

    } else {

        if (info) {

            /* virtio-1 allows changing the ring size. */

            if (virtio_queue_get_num(vdev, index) < num) {

                /* Fail if we exceed the maximum number. */

                return -EINVAL;

            }

            virtio_queue_set_num(vdev, index, num);

        } else if (virtio_queue_get_num(vdev, index) > num) {

            /* Fail if we don't have a big enough queue. */

        /* TODO: Add interface to handle vring.num changing */

        if (virtio_queue_get_num(vdev, index) > num) {

            return -EINVAL;

        }

        /* We ignore possible increased num for legacy for compatibility. */

        virtio_queue_set_vector(vdev, index, index);

    }

    /* tell notify handler in case of config change */