Re: [RFC PATCH 0/9] PV device infrastructure v2

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

On Wed, 2007-08-15 at 00:13 -0400, Gregory Haskins wrote:
> On Wed, 2007-08-15 at 06:58 +0300, Avi Kivity wrote:
> >    
> > 
> > Yes.  virtio adapts the driver interface to an API can drive a shared
> > memory queue more easily, while you actually provide the queue protocol
> > (and ABI).
> 
> If I understand what you are saying, it actually jives with something
> that struck me as a potentially win-win a while back when I first heard
> about virtio.  That is: you can actually implement virtio with ioq.  I
> am not sure if that idea has any merit or not, especially given the news
> that virtio for KVM is almost done....but I thought I would mention it. 


BTW, the lguest virtio implementation is available in Rusty's patch
queue (linked off http://lguest.ozlabs.org).

Regards,

Anthony Liguori

> > 
> > virtio seems to have more modest goals:
> > 
> > - make it easier to write guest/host (or guest/guest) transports, but
> > not actually provide them
> > - limited to guest only (and Linux only)
> > - no discovery/hotplug (yet?)
> 
> As an aside, the version of the pvbus that I am working on right now
> (v3?) adds hotplug capability.  I assume that there is some merit to me
> continuing the work at least on the discovery/hotplug front then?
> > 
> > since it wants to be hypervisor agnostic, it cannot specify an ABI (as
> > some already have ABIs, for example Xen).
> 
> I see, and that is a good point.  By only being an API, virtio can work
> over XenBus or any other ABI it wants.  IOQ is an API *and* an ABI.
> While this doesnt preclude it from ever working on Xen, it does imply
> that you would need to add the IOQ ABI to the Xen infrastructure if you
> wanted to use it (at least, if you wanted to use it directly instead of
> doing some kind of funky queue-in-queue with IOQ on XenBus..yuk). 
> 
> -Greg
> 
> 
> 
> 
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