linux-kernel - Re: [PATCH v7 2/3] vduse: Temporarily fail if control queue feature requested

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Date: Tue, 9 Jan 2024 12:38:15 +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 v7 2/3] vduse: Temporarily fail if control queue feature requested

On Tue, Jan 9, 2024 at 12:11 PM Maxime Coquelin
<maxime.coquelin@...hat.com> wrote:
>
> Virtio-net driver control queue implementation is not safe
> when used with VDUSE. If the VDUSE application does not
> reply to control queue messages, it currently ends up
> hanging the kernel thread sending this command.
>
> Some work is on-going to make the control queue
> implementation robust with VDUSE. Until it is completed,
> let's fail features check if control-queue feature is
> requested.
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>

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

Thanks!

> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index a5af6d4077b8..00f3f562ab5d 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -8,6 +8,7 @@
>   *
>   */
>
> +#include "linux/virtio_net.h"
>  #include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/cdev.h>
> @@ -28,6 +29,7 @@
>  #include <uapi/linux/virtio_config.h>
>  #include <uapi/linux/virtio_ids.h>
>  #include <uapi/linux/virtio_blk.h>
> +#include <uapi/linux/virtio_ring.h>
>  #include <linux/mod_devicetable.h>
>
>  #include "iova_domain.h"
> @@ -1680,6 +1682,9 @@ static bool features_is_valid(struct vduse_dev_config *config)
>         if ((config->device_id == VIRTIO_ID_BLOCK) &&
>                         (config->features & BIT_ULL(VIRTIO_BLK_F_CONFIG_WCE)))
>                 return false;
> +       else if ((config->device_id == VIRTIO_ID_NET) &&
> +                       (config->features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)))
> +               return false;
>
>         return true;
>  }
> --
> 2.43.0
>
>