Re: [Xen-devel] [Qemu-devel] [PATCH] Citrix PV Bus device

[Alex Bligh <alex@xxxxxxxxxxx>]

Ian,

--On 2 July 2013 14:42:41 +0100 Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
wrote:
> > Let's say we do this, then Xirtic also produce PV drivers, and get
> > assigned their own device ID. Will both of them be visible with
> > a different device ID for the same device?
> Different device ID for the same device isn't possible, a device has
> exactly one device ID. I assume you mean two devices visible one with
> each ID?
Yes. Two PCI devices talking to the same underlying thing.

> >  Will windows cope with that?
> > Or do we need to mediate which device IDs are exposed?
> I'd expect that only Xirtic products would provide a device with that
> device ID. They may choose to make it mutually exclusive with the
> standard device, or they may choose to allow it to co-exist. In the
> latter case it is down to them what the behaviour of their drivers is.
> In any case this is all down to the people who make that product and
> their requirements etc.
>
> For people running Xirtic drivers on non-Xirtic products the rest of my
> mail applies -- IOW those users would use a setup.exe which binds those
> drivers to the normal device, there is no Xirtic device ID present
> anywhere in this scenario.
OK. The thing I was suggesting we try to avoid was Citrix drivers
binding to PCI-ID A and Xirtic drivers binding to PCI-ID B, and them
both trying to work at once.

Perhaps I should stop worrying about this as I'm finding it really hard
to resist typing 'so don't use Windows' :-)

--
Alex Bligh

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