Current code seems to assume ring size is
always decreased but this is not required by spec:
what spec says is just that size can not exceed
the maximum. Fix it up.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <
1484256243-1982-1-git-send-email-mst@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
} else {
if (info) {
/* virtio-1 allows changing the ring size. */
- if (virtio_queue_get_num(vdev, index) < num) {
+ if (virtio_queue_get_max_num(vdev, index) < num) {
/* Fail if we exceed the maximum number. */
return -EINVAL;
}
return vdev->vq[n].vring.num;
}
+int virtio_queue_get_max_num(VirtIODevice *vdev, int n)
+{
+ return vdev->vq[n].vring.num_default;
+}
+
int virtio_get_num_queues(VirtIODevice *vdev)
{
int i;
hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
int virtio_queue_get_num(VirtIODevice *vdev, int n);
+int virtio_queue_get_max_num(VirtIODevice *vdev, int n);
int virtio_get_num_queues(VirtIODevice *vdev);
void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
hwaddr avail, hwaddr used);