linux-kernel - Re: [PATCH v6 3/3] vduse: enable Virtio-net device type

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Date: Fri, 5 Jan 2024 11:00:01 +0100
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Maxime Coquelin <maxime.coquelin@...hat.com>
Cc: mst@...hat.com, jasowang@...hat.com, xuanzhuo@...ux.alibaba.com, 
	xieyongji@...edance.com, virtualization@...ts.linux-foundation.org, 
	linux-kernel@...r.kernel.org, david.marchand@...hat.com, lulu@...hat.com
Subject: Re: [PATCH v6 3/3] vduse: enable Virtio-net device type

On Thu, Jan 4, 2024 at 4:39 PM Maxime Coquelin
<maxime.coquelin@...hat.com> wrote:
>
> This patch adds Virtio-net device type to the supported
> devices types.
>
> Initialization fails if the device does not support
> VIRTIO_F_VERSION_1 feature, in order to guarantee the
> configuration space is read-only. It also fails with
> -EPERM if the CAP_NET_ADMIN is missing.
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>

Reviewed-by: Eugenio Pérez <eperezma@...hat.com>

> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 94f54ea2eb06..4057b34ff995 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -151,6 +151,7 @@ static struct workqueue_struct *vduse_irq_bound_wq;
>
>  static u32 allowed_device_id[] = {
>         VIRTIO_ID_BLOCK,
> +       VIRTIO_ID_NET,
>  };
>
>  static inline struct vduse_dev *vdpa_to_vduse(struct vdpa_device *vdpa)
> @@ -1694,6 +1695,10 @@ static bool features_is_valid(struct vduse_dev_config *config)
>                         (config->features & VDUSE_NET_INVALID_FEATURES_MASK))
>                 return false;
>
> +       if ((config->device_id == VIRTIO_ID_NET) &&
> +                       !(config->features & (1ULL << VIRTIO_F_VERSION_1)))
> +               return false;
> +
>         return true;
>  }
>
> @@ -1801,6 +1806,10 @@ static int vduse_create_dev(struct vduse_dev_config *config,
>         int ret;
>         struct vduse_dev *dev;
>
> +       ret = -EPERM;
> +       if ((config->device_id == VIRTIO_ID_NET) && !capable(CAP_NET_ADMIN))
> +               goto err;
> +
>         ret = -EEXIST;
>         if (vduse_find_dev(config->name))
>                 goto err;
> @@ -2044,6 +2053,7 @@ static const struct vdpa_mgmtdev_ops vdpa_dev_mgmtdev_ops = {
>
>  static struct virtio_device_id id_table[] = {
>         { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
> +       { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
>         { 0 },
>  };
>
> --
> 2.43.0
>
>