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

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Message-ID: <20230810150054.7baf34b7@kernel.org>
Date:   Thu, 10 Aug 2023 15:00:54 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Maxime Coquelin <maxime.coquelin@...hat.com>,
        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 Thu, 10 Aug 2023 17:42:11 -0400 Michael S. Tsirkin wrote:
> > Directly into the stack? I thought VDUSE is vDPA in user space,
> > meaning to get to the kernel the packet has to first go thru 
> > a virtio-net instance.  
> 
> yes. is that a sufficient filter in your opinion?

Yes, the ability to create the device feels stronger than CAP_NET_RAW,
and a bit tangential to CAP_NET_ADMIN. But I don't have much practical
experience with virt so no strong opinion, perhaps it does make sense
for someone's deployment? Dunno..