[SLOF] [PATCH] pci: Reserve free space at the end of bridge windows instead of at the beginning

[Thomas Huth]

On 19.05.2017 08:44, David Gibson wrote:
> On Fri, May 19, 2017 at 08:28:48AM +0200, Thomas Huth wrote:
>> On 19.05.2017 07:47, David Gibson wrote:
>> [...]
>>> That said, I just realized there's another wrinkle here - we're going
>>> to need to introduce a compatibility mode for SLOF (presumably keyed
>>> off a device tree variable) so that we don't introduce a guest-visible
>>> change in older machine types.
>>
>> I don't think so. It does not affect migration, you only get a different
>> layout once you reboot the guest - and then the OS should adapt to that
>> new layout automatically.
> 
> Hm, according to Andrea at least, that's not sufficient - the same
> argument applies to the CAS PVR negotiation changes.

We've never added compatibility switches in the past that only affect
the boot process of SLOF ... for example, we also did not add anything
for the recent changes like 975b31f80aff26addee5d70c34de9cd1b0a204ca or
cbb69ccd92de3864ec14ab48ae256ce6876c244f. And I don't see a reason why
we should change this now, or is there a scenario where this could
really, really render problems for us?

 Thomas

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