From: Stefano Garzarella sgarzare@redhat.com
[ Upstream commit 794ec498c9fa79e6bfd71b931410d5897a9c00d4 ]
When we initialize vringh, we should pass the features and the number of elements in the virtqueue negotiated with the driver, otherwise operations with vringh may fail.
This was discovered in a case where the driver sets a number of elements in the virtqueue different from the value returned by .get_vq_num_max().
In vdpasim_vq_reset() is safe to initialize the vringh with default values, since the virtqueue will not be used until vdpasim_queue_ready() is called again.
Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator") Signed-off-by: Stefano Garzarella sgarzare@redhat.com Message-Id: 20221110141335.62171-1-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Acked-by: Jason Wang jasowang@redhat.com Acked-by: Eugenio Pérez eperezma@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index b071f0d842fb..b20689f8fe89 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -67,8 +67,7 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx) { struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
- vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features, - VDPASIM_QUEUE_MAX, false, + vringh_init_iotlb(&vq->vring, vdpasim->features, vq->num, false, (struct vring_desc *)(uintptr_t)vq->desc_addr, (struct vring_avail *) (uintptr_t)vq->driver_addr,