Re: [Qemu-devel] [PATCH 3/4] cryptodev-vhost-user: add crypto session handler

[Paolo Bonzini]

On 28/11/2017 12:06, Gonglei (Arei) wrote:
>>> You mean we can share control virtqueue to DPDK as well? Like data queues?
>> I don't know :) but why not?
>>
> Current there are two main reasons for this design:
> 
> 1) we should use another cpu to polling the control virtqueue, which is 
> expensive.

IIRC DPDK also supports interrupt mode, doesn't it?  Is it possible to
do interrupt mode for some virtqueues and poll mode for others?

> 2) we should copy the logic of parsing control message to DPDK, which break
>  current layered architecture .

But isn't it already a layering violation that you're adding *some*
control messages to the vhost-user protocol?  I am not sure why only
these two are necessary.

Paolo

> I'm not sure if there are any other hidden issues for future scalability, 
> such as
> using Qemu to manage some control messages, avoiding D-Dos attack etc.
> 
> Thanks,
> -Gonglei