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

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Date:   Wed, 20 Jan 2021 11:46:38 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>, mst@...hat.com,
        stefanha@...hat.com, sgarzare@...hat.com, parav@...dia.com,
        bob.liu@...cle.com, hch@...radead.org, rdunlap@...radead.org,
        willy@...radead.org, viro@...iv.linux.org.uk, axboe@...nel.dk,
        bcrl@...ck.org, corbet@....net
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [RFC v3 03/11] vdpa: Remove the restriction that only supports
 virtio-net devices


On 2021/1/19 下午12:59, Xie Yongji wrote:
> With VDUSE, we should be able to support all kinds of virtio devices.
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> ---
>   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.

Thanks


> -
>   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;