netdev - Re: [PATCH v3 0/3] vduse: add support for networking devices

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Date: Thu, 10 Aug 2023 15:04:27 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Maxime Coquelin <maxime.coquelin@...hat.com>
Cc: xieyongji@...edance.com, jasowang@...hat.com, david.marchand@...hat.com,
	lulu@...hat.com, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	xuanzhuo@...ux.alibaba.com, eperezma@...hat.com
Subject: Re: [PATCH v3 0/3] vduse: add support for networking devices

On Wed, Jul 05, 2023 at 12:04:27PM +0200, Maxime Coquelin wrote:
> This small series enables virtio-net device type in VDUSE.
> With it, basic operation have been tested, both with
> virtio-vdpa and vhost-vdpa using DPDK Vhost library series
> adding VDUSE support using split rings layout (merged in
> DPDK v23.07-rc1).
> 
> Control queue support (and so multiqueue) has also been
> tested, but requires a Kernel series from Jason Wang
> relaxing control queue polling [1] to function reliably,
> so while Jason rework is done, a patch is added to disable
> CVQ and features that depend on it (tested also with DPDK
> v23.07-rc1).


So I can put this in next, the issue I think is
that of security: currently selinux can if necessary block
access to creating virtio block devices.
But if we have more than one type we need a way for selinux to
block specific types. Can be a patch on top but pls work to
address.

Another question is that with this userspace can inject
packets directly into net stack. Should we check CAP_NET_ADMIN
or such?



> [1]: https://lore.kernel.org/lkml/CACGkMEtgrxN3PPwsDo4oOsnsSLJfEmBEZ0WvjGRr3whU+QasUg@mail.gmail.com/T/
> 
> v2 -> v3 changes:
> =================
> - Use allow list instead of deny list (Michael)
> 
> v1 -> v2 changes:
> =================
> - Add a patch to disable CVQ (Michael)
> 
> RFC -> v1 changes:
> ==================
> - Fail device init if it does not support VERSION_1 (Jason)
> 
> Maxime Coquelin (3):
>   vduse: validate block features only with block devices
>   vduse: enable Virtio-net device type
>   vduse: Temporarily disable control queue features
> 
>  drivers/vdpa/vdpa_user/vduse_dev.c | 51 +++++++++++++++++++++++++++---
>  1 file changed, 47 insertions(+), 4 deletions(-)
> 
> -- 
> 2.41.0