[PATCH 1/2] vhost: search the split vq desc and avail in RO areas

[Eugenio Pérez]

QEMU's shadow virtqueue and VDUSE exposes these areas as read-only. If
we don't change it, vhost_iova_to_vva do not consider them as valid and
returns that they're not found.

Fixes: eefac9536a90 ("vhost: postpone device creation until rings are mapped")
Cc: stable at dpdk.org

Signed-off-by: Eugenio Pérez <eperezma at redhat.com>
---
 lib/vhost/vhost.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/vhost/vhost.c b/lib/vhost/vhost.c
index 0353a04dc8..95a99bace6 100644
--- a/lib/vhost/vhost.c
+++ b/lib/vhost/vhost.c
@@ -497,7 +497,7 @@ vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 	size = req_size;
 	vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 						vq->ring_addrs.desc_user_addr,
-						&size, VHOST_ACCESS_RW);
+						&size, VHOST_ACCESS_RO);
 	if (!vq->desc || size != req_size)
 		return -1;
 
@@ -508,7 +508,7 @@ vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 	size = req_size;
 	vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 						vq->ring_addrs.avail_user_addr,
-						&size, VHOST_ACCESS_RW);
+						&size, VHOST_ACCESS_RO);
 	if (!vq->avail || size != req_size)
 		return -1;
 
-- 
2.49.0