Re: [Xen-devel] Other PCI devices to mark mark as read-only for dom0

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 22/06/12 13:20, Jan Beulich wrote:
>>> Because, just like for normal, non-PCI based serial ones, ports
>>> that Xen doesn't use should remain usable by Dom0. For
>>> example, I have a PCI card with two serial and one parallel
>>> ports, so with Xen using one serial port for itself, there's no
>>> reason not to allow Dom0 to use the other or the parallel one.
>> I apologize.  I originally used the term 'device' when I intended to use
>> 'function', so I think we are arguing for the same point.
> And I understood you meaning so - from a PCI terminology pov.
> Multi-function here, however, means multiple serial/parallel ports
> within a single PCI function (PCI_CLASS_COMMUNICATION_MULTISERIAL
> or PCI_CLASS_COMMUNICATION_OTHER). Hence we shouldn't hide a
> full S:B:D.F just because we use some portion of it.
>
> Jan
>

Ah right.  Yes.  Perhaps then a warning on the Xen console if Xen
encounters such a device.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com




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