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

[Stefano Garzarella <sgarzare@xxxxxxxxxx>]

On Tue, Jan 19, 2021 at 12:59:12PM +0800, Xie Yongji wrote:
> With VDUSE, we should be able to support all kinds of virtio devices.
>
> Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> ---
> 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>

Is this inclusion necessary?

Maybe we can remove virtio_net.h as well.

Thanks,
Stefano

> #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;
> -}
> -
> static long vhost_vdpa_get_config(struct vhost_vdpa *v,
> 				  struct vhost_vdpa_config __user *c)
> {
> @@ -215,7 +196,7 @@ static long vhost_vdpa_get_config(struct vhost_vdpa *v,
>
> 	if (copy_from_user(&config, c, size))
> 		return -EFAULT;
> -	if (vhost_vdpa_config_validate(v, &config))
> +	if (config.len == 0)
> 		return -EINVAL;
> 	buf = kvzalloc(config.len, GFP_KERNEL);
> 	if (!buf)
> @@ -243,7 +224,7 @@ static long vhost_vdpa_set_config(struct vhost_vdpa *v,
>
> 	if (copy_from_user(&config, c, size))
> 		return -EFAULT;
> -	if (vhost_vdpa_config_validate(v, &config))
> +	if (config.len == 0)
> 		return -EINVAL;
> 	buf = kvzalloc(config.len, GFP_KERNEL);
> 	if (!buf)
> @@ -1025,10 +1006,6 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
> 	int minor;
> 	int r;
>
> -	/* Currently, we only accept the network devices. */
> -	if (ops->get_device_id(vdpa) != VIRTIO_ID_NET)
> -		return -ENOTSUPP;
> -
> 	v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
> 	if (!v)
> 		return -ENOMEM;
> --
> 2.11.0