Re: [RFC v3 03/11] vdpa: Remove the restriction that only supports virtio-net devices

On Wed, Jan 20, 2021 at 11:46:38AM +0800, Jason Wang wrote:

On 2021/1/19 下午12:59, Xie Yongji wrote:

quoted

With VDUSE, we should be able to support all kinds of virtio devices.

Signed-off-by: Xie Yongji <redacted>
---
 drivers/vhost/vdpa.c | 29 +++--------------------------
 1 file changed, 3 insertions(+), 26 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 29ed4173f04e..448be7875b6d 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c

@@ -22,6 +22,7 @@
 #include <linux/nospec.h>
 #include <linux/vhost.h>
 #include <linux/virtio_net.h>
+#include <linux/virtio_blk.h>
 #include "vhost.h"

@@ -185,26 +186,6 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
 	return 0;
 }
-static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
-				      struct vhost_vdpa_config *c)
-{
-	long size = 0;
-
-	switch (v->virtio_id) {
-	case VIRTIO_ID_NET:
-		size = sizeof(struct virtio_net_config);
-		break;
-	}
-
-	if (c->len == 0)
-		return -EINVAL;
-
-	if (c->len > size - c->off)
-		return -E2BIG;
-
-	return 0;
-}

I think we should use a separate patch for this.

For the vdpa-blk simulator I had the same issues and I'm adding a 
.get_config_size() callback to vdpa devices.

Do you think make sense or is better to remove this check in vhost/vdpa, 
delegating the boundaries checks to get_config/set_config callbacks.

Thanks,
Stefano

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