linux-kernel - Re: [PATCH 2/2] virtio-net: fix buggy features advertised by host

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Date:	Thu, 13 Nov 2014 09:53:26 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] virtio-net: fix buggy features advertised by host

On Thu, 13 Nov 2014 13:52:54 +0800
Jason Wang <jasowang@...hat.com> wrote:

> This patch tries to detect the possible buggy features advertised by host
> and fix them. One example is booting virtio-net with only ctrl_vq disabled,
> qemu may still advertise many features which depends on it. This will
> trigger several BUG()s in virtnet_send_command().
> 
> This patch utilizes the fix_features() method, and disables all features that
> depends on ctrl_vq if it was not advertised.
> 
> This fixes the crash when booting with ctrl_vq=off.

That's a qemu device property, right? Might want to mention that, as
this line sounds like it is a kernel parameter.

> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
> Changes from V1:
> - fix the cut-and-paste error
> ---
>  drivers/net/virtio_net.c | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index ec2a8b4..6ce125e 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1948,6 +1948,40 @@ static int virtnet_restore(struct virtio_device *vdev)
>  }
>  #endif
> 
> +static void virtnet_fix_features(struct virtio_device *dev)
> +{
> +	if (!virtio_has_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
> +		if (virtio_has_feature(dev, VIRTIO_NET_F_CTRL_RX)) {
> +			pr_warning("Disable VIRTIO_NET_F_CTRL_RX since host "
> +				   "does not advertise VIRTIO_NET_F_CTRL_VQ");
> +			virtio_disable_feature(dev, VIRTIO_NET_F_CTRL_RX);
> +		}

You should probably use dev_warn() or so, so that the user can figure
out which device the message is for. And perhaps add "buggy hypervisor"
to the message to make clear that it's not a guest problem.

I also like the suggestion to use a dependency array.

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