linux-kernel - Re: [PATCH v6 2/3] vduse: Temporarily fail if control queue features requested

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Date: Fri, 5 Jan 2024 10:45:32 +0800
From: Jason Wang <jasowang@...hat.com>
To: Maxime Coquelin <maxime.coquelin@...hat.com>
Cc: mst@...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 2/3] vduse: Temporarily fail if control queue features requested

On Thu, Jan 4, 2024 at 11:38 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 any control-queue related
> feature is requested.
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>
> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 0486ff672408..94f54ea2eb06 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -28,6 +28,7 @@
>  #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"
> @@ -46,6 +47,15 @@
>
>  #define IRQ_UNBOUND -1
>
> +#define VDUSE_NET_INVALID_FEATURES_MASK         \
> +       (BIT_ULL(VIRTIO_NET_F_CTRL_VQ) |        \
> +        BIT_ULL(VIRTIO_NET_F_CTRL_RX)   |      \
> +        BIT_ULL(VIRTIO_NET_F_CTRL_VLAN) |      \
> +        BIT_ULL(VIRTIO_NET_F_GUEST_ANNOUNCE) | \
> +        BIT_ULL(VIRTIO_NET_F_MQ) |             \
> +        BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |  \
> +        BIT_ULL(VIRTIO_NET_F_RSS))

We need to make this as well:

VIRTIO_NET_F_CTRL_GUEST_OFFLOADS

Other than this,

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

> +
>  struct vduse_virtqueue {
>         u16 index;
>         u16 num_max;
> @@ -1680,6 +1690,9 @@ static bool features_is_valid(struct vduse_dev_config *config)
>         if ((config->device_id == VIRTIO_ID_BLOCK) &&
>                         (config->features & (1ULL << VIRTIO_BLK_F_CONFIG_WCE)))
>                 return false;
> +       else if ((config->device_id == VIRTIO_ID_NET) &&
> +                       (config->features & VDUSE_NET_INVALID_FEATURES_MASK))
> +               return false;
>
>         return true;
>  }
> --
> 2.43.0
>