Re: [PATCH qemu-kvm] Add raw(af_packet) network backend to qemu

Anthony Liguori
2010-01-28T14:39:45Z

On 01/28/2010 08:13 AM, Anthony Liguori wrote:
> On 01/28/2010 07:56 AM, Michael S. Tsirkin wrote:
>>> Now, the most important use case I see for the raw socket interface
>>> in qemu is to get vhost-net and the qemu user implementation to
>>> support the same feature set. If you ask for a network setup involving
>>> a raw socket and vhost-net and the kernel can support raw sockets
>>> but for some reason fails to set up vhost-net, you should have a
>>> fallback that has the exact same semantics at a possibly significant
>>> performance loss.
>>>
>>> Arnd
>> Makes sense. A simple reason you can't do vhost-net would be
>> that you are using tcg.
>
> Some good arguments have been raised in this thread. I really don't
> like making our security depend on something external to qemu that is
> not widely used or understood.

Thinking about it, I don't think network namespaces actually provides us
the security that we need. It's quite easy to break out of it if not
being used in the context of a full container.

But this discussion belongs in netdev, I'll raise the issue there.

Regards,

Anthony Liguori