vhost: drop legacy vring layout bits

The legacy vring layout is not used anymore as we use the separate
mappings even for legacy devices.
This patch simply removes it.

This also fixes a bug with virtio 1 devices when the vring descriptor table
is mapped at a higher address than the used vring because the following
function may return an insanely great value:

hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
{
    return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
           virtio_queue_get_used_size(vdev, n);
}

and the mapping fails.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 0 insertions, 16 deletions

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index d88d34a044..30aee88a3e 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -923,14 +923,6 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
         goto fail_alloc_used;
     }
 
-    vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
-    vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
-    vq->ring = cpu_physical_memory_map(a, &l, 1);
-    if (!vq->ring || l != s) {
-        r = -ENOMEM;
-        goto fail_alloc_ring;
-    }
-
     r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
     if (r < 0) {
         r = -errno;
@@ -971,9 +963,6 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
 fail_vector:
 fail_kick:
 fail_alloc:
-    cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
-                              0, 0);
-fail_alloc_ring:
     cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
                               0, 0);
 fail_alloc_used:
@@ -1014,8 +1003,6 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
                                                 vhost_vq_index);
     }
 
-    cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
-                              0, virtio_queue_get_ring_size(vdev, idx));
     cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
                               1, virtio_queue_get_used_size(vdev, idx));
     cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 56b567f199..1fe5aadef5 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -20,9 +20,6 @@ struct vhost_virtqueue {
     unsigned avail_size;
     unsigned long long used_phys;
     unsigned used_size;
-    void *ring;
-    unsigned long long ring_phys;
-    unsigned ring_size;
     EventNotifier masked_notifier;
 };