netdev - Re: [Alacrityvm-devel] [GIT PULL] AlacrityVM guest drivers for 2.6.33

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Message-ID: <4B375EAD.8050204@gmail.com>
Date:	Sun, 27 Dec 2009 08:18:37 -0500
From:	Gregory Haskins <gregory.haskins@...il.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Andi Kleen <andi@...stfloor.org>, kvm@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alacrityvm-devel@...ts.sourceforge.net" 
	<alacrityvm-devel@...ts.sourceforge.net>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Alacrityvm-devel] [GIT PULL] AlacrityVM guest drivers for 2.6.33

On 12/27/09 4:15 AM, Avi Kivity wrote:
> On 12/23/2009 11:21 PM, Gregory Haskins wrote:
>> That said, you are still incorrect.  With what I proposed, the model
>> will run as an in-kernel vbus device, and no longer run in userspace.
>> It would therefore improve virtio-net as I stated, much in the same
>> way vhost-net or venet-tap do today.
>>    
> 
> That can't work.  virtio-net has its own ABI on top of virtio, for
> example it prepends a header for TSO information.  Maybe if you disable
> all features it becomes compatible with venet, but that cripples it.
> 


You are confused.  The backend would be virtio-net specific, and would
therefore understand the virtio-net ABI.  It would support any feature
of virtio-net as long as it was implemented and negotiated by both sides
of the link.

-Greg


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