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

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jan 28, 2010 at 08:13:53AM -0600, 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.
>
> That said, I'm not seeing a lot of great alternatives.  I definitely  
> like -net socket better than -net raw.  In the absence of an  
> extraordinarily clever solution, I think we may be stuck with doing this.

Agreed on all points.

> Regards,
>
> Anthony Liguori