netdev - Re: [PATCH 2/2] vhost_net: a kernel-level virtio server

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Date:	Thu, 13 Aug 2009 11:45:13 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Arnd Bergmann <arnd@...db.de>,
	virtualization@...ts.linux-foundation.org,
	"Ira W. Snyder" <iws@...o.caltech.edu>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] vhost_net: a kernel-level virtio server

On Wed, Aug 12, 2009 at 02:22:38PM -0500, Anthony Liguori wrote:
> Michael S. Tsirkin wrote:
>>>
>>> We discussed this before, and I still think this could be directly derived
>>> from struct virtqueue, in the same way that vring_virtqueue is derived from
>>> struct virtqueue.
>>>     
>>
>> I prefer keeping it simple. Much of abstraction in virtio is due to the
>> fact that it needs to work on top of different hardware emulations:
>> lguest,kvm, possibly others in the future.  vhost is always working on
>> real hardware, using eventfd as the interface, so it does not need that.
>>   
>
> Actually, vhost may not always be limited to real hardware.

Yes, any ethernet device will do. What I mean is that vhost does not
deal with emulation at all. All setup is done in userspace.

>
> We may on day use vhost as the basis of a driver domain.  There's quite  
> a lot of interest in this for networking.

You can use veth for this. This works today.

> At any rate, I'd like to see performance results before we consider  
> trying to reuse virtio code.
> 
> Regards,
>
> Anthony Liguori
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