vDPA simulators are software emulated device, so let's switch to use
weak barriers to avoid extra overhead in the driver.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index b071f0d842fb..eeaeaf43b476 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -68,7 +68,7 @@ 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,
+			  VDPASIM_QUEUE_MAX, true,
 			  (struct vring_desc *)(uintptr_t)vq->desc_addr,
 			  (struct vring_avail *)
 			  (uintptr_t)vq->driver_addr,
-- 
2.25.1

On Wed, Dec 21, 2022 at 7:21 AM Jason Wang <jasowang@redhat.com> wrote:
>
> vDPA simulators are software emulated device, so let's switch to use
> weak barriers to avoid extra overhead in the driver.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>

Acked-by: Eugenio Pérez <eperezma@redhat.com>

Thanks!

> ---
>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index b071f0d842fb..eeaeaf43b476 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -68,7 +68,7 @@ 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,
> +                         VDPASIM_QUEUE_MAX, true,
>                           (struct vring_desc *)(uintptr_t)vq->desc_addr,
>                           (struct vring_avail *)
>                           (uintptr_t)vq->driver_addr,
> --
> 2.25.1
>

On Wed, Dec 21, 2022 at 02:21:46PM +0800, Jason Wang wrote:
>vDPA simulators are software emulated device, so let's switch to use
>weak barriers to avoid extra overhead in the driver.
>
>Signed-off-by: Jason Wang <jasowang@redhat.com>
>---
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

I was going to propose the same :-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

>
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>index b071f0d842fb..eeaeaf43b476 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>@@ -68,7 +68,7 @@ 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,
>+			  VDPASIM_QUEUE_MAX, true,
> 			  (struct vring_desc *)(uintptr_t)vq->desc_addr,
> 			  (struct vring_avail *)
> 			  (uintptr_t)vq->driver_addr,
>-- 
>2.25.1
>