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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 6/5/25 1:35 PM, Eugenio Pérez wrote: > 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@dpdk.org > > Signed-off-by: Eugenio Pérez > --- > 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; > I propose below text for the commit message: " The virtqueues driver areas are read-only for the device. While they are exposed as Read/Write to Vhost-user and regular VDUSE backends, they are only exposed as Read-only when the control Virtqueue is shadowed by QEMU with VDUSE backend. This patch makes the backend to request these areas as Read-only, so that it can be accessed in all the configurations. " Also, as requested by David, patch 2 will be squashed into this one. Eugenio, is that Ok for you? With above suggested changes: Reviewed-by: Maxime Coquelin Thanks, Maxime