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dataplane: fix cross-endian issues 

Accesses to vring_avail_event and vring_used_event must honor the queue
endianness.

This patch allows cross-endian setups to use dataplane (tested with ppc64
on ppc64le, and vice-versa).

Suggested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Greg Kurz 2015-06-26 09:32:28 +02:00 committed by Michael S. Tsirkin
parent f6e3035f75
commit be1e50a27d
1 changed files with 4 additions and 2 deletions
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6
hw/virtio/dataplane/vring.c
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@ -153,7 +153,8 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring)
return true; return true;
} }
return vring_need_event(vring_used_event(&vring->vr), new, old); return vring_need_event(virtio_tswap16(vdev, vring_used_event(&vring->vr)),
new, old);
} }
@ -407,7 +408,8 @@ int vring_pop(VirtIODevice *vdev, Vring *vring,
/* On success, increment avail index. */ /* On success, increment avail index. */
vring->last_avail_idx++; vring->last_avail_idx++;
if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
vring_avail_event(&vring->vr) = vring->last_avail_idx; vring_avail_event(&vring->vr) =
virtio_tswap16(vdev, vring->last_avail_idx);
} }
return head; return head;