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    SubjectRe: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus_driver objects
    Avi Kivity wrote:
    > 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.

    Sigh...


    >
    >>>>> 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?
    >

    No, it doesnt work like that. There is only one connector.

    Kind Regards,
    -Greg

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