Re: [Xen-devel] [Qemu-devel] [PATCH] Add Xen platform PCI device version 2.

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Tim Deegan [mailto:tim@xxxxxxx]
> Sent: 20 June 2013 09:56
> To: Paul Durrant
> Cc: Matt Wilson; Alex Bligh; xen-devel@xxxxxxxxxxxxx; Ian Campbell; qemu-
> devel@xxxxxxxxxx
> Subject: Re: [Xen-devel] [Qemu-devel] [PATCH] Add Xen platform PCI device
> version 2.
> 
> At 07:47 +0000 on 20 Jun (1371714432), Paul Durrant wrote:
> > > > I agree. If this is really the only solution, we would need to have
> > > > both versions presented to the guest so that old drivers continue to
> > > > work without any intervention.
> > >
> > > I suspect that if we expose both, both sets of drivers try to run the
> > > same PV connections, and hilarity ensues.
> > >
> >
> > Actually I think I can make that work, and it is the conclusion I came
> > to after Alex's comment.
> 
> Ah, nice!  In that case, I'm a lot less worried -- we can just expose
> both versions/devices by default and there's no need for a visible
> control knob tied to driver version (except maybe for debugging).
> 
> It means an 'unsupported' device appearing on other/older OSes, which is
> unfortunate, but ISTR only Windows really complains visibly about that.
> 

Yes, I think only Windows complains and we should be able to post an article 
somewhere saying 'don't worry about it' :-)

  Paul

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