netdev - Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus

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Date:	Wed, 19 Aug 2009 05:40:37 -0600
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Avi Kivity" <avi@...hat.com>
Cc:	"Anthony Liguori" <anthony@...emonkey.ws>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Gregory Haskins" <gregory.haskins@...il.com>,
	<alacrityvm-devel@...ts.sourceforge.net>,
	"Michael S. Tsirkin" <mst@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for	
	 vbus_driver objects

>>> On 8/19/2009 at  3:13 AM, in message <4A8BA635.9010902@...hat.com>, Avi Kivity
<avi@...hat.com> wrote: 
> On 08/19/2009 09:40 AM, Gregory Haskins wrote:
>>
>>    
>>>> So if I whip up a virtio-net backend for vbus with a PCI compliant
>>>> connector, you are happy?
>>>>
>>>>        
>>> This doesn't improve virtio-net in any way.
>>>      
>> Any why not?  (Did you notice I said "PCI compliant", i.e. over virtio-pci)
>>    
> 
> Because virtio-net will have gained nothing that it didn't have before.

??

*) ABI is virtio-pci compatible, as you like
*) fast-path is in-kernel, as we all like
*) model is in vbus so it would work in all environments that vbus supports.

> 
> 
> 
> 
>>> virtio already supports this model; see lguest and s390.  Transporting
>>> virtio over vbus and vbus over something else doesn't gain anything over
>>> directly transporting virtio over that something else.
>>>      
>> This is not what I am advocating.
>>
>>    
> 
> What are you advocating?  As far as I can tell your virtio-vbus 
> connector plus the vbus-kvm connector is just that.

I wouldn't classify it anything like that, no.  Its just virtio over vbus.

-Greg





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