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SubjectRe: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus_driver objects
On 08/19/2009 02:40 PM, 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
>

That's not a gain, that's staying in the same place.

> *) fast-path is in-kernel, as we all like
>

That's not a gain as we have vhost-net (sure, in development, but your
proposed backend isn't even there yet).

> *) model is in vbus so it would work in all environments that vbus supports.
>

The ABI can be virtio-pci compatible or it can be vbus-comaptible. How
can it be both? The ABIs are different.

Note that if you had submitted a virtio-net backend I'd have asked you
to strip away all the management / bus layers and we'd have ended up
with vhost-net.

>>>> 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.
>

We're in a loop. Doesn't virtio over vbus need a virtio-vbus
connector? and doesn't vbus need a connector to talk to the hypervisor?

--
error compiling committee.c: too many arguments to function



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