Virtualization - Dec 2022 - [PATCH] vdpa_sim: use weak barriers

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 at 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 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 at 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 at 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
>