Re: [Xen-devel] [PATCH v3 11/13] xen/iommu: smmu: Introduce automatic stream-id-masking

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Mon, 2015-02-23 at 10:52 +0000, Julien Grall wrote:
> 
> On 23/02/2015 10:42, Ian Campbell wrote:
> >> On a side note, we consider this platform deprecated we should either
> >> drop the code from Xen or write on the wiki that we don't fully support
> >> it anymore.
> >
> > It's all about degrees, I think we are fine to support the existing
> > feature set and commit to keeping that working, but I'm not sure we
> > should be enabling new features for the platform, in particular when the
> > patches in question cause us to have to diverge from the upstream for a
> > particular driver.
> 
> I'm afraid to say that even without these 2 patches (#10 and #11) we 
> already diverge from upstream (> 3.19)... They reworked a big part of 
> the code (mostly P2M handling) in this version.

Failing to keep up is not the same as diverging IMHO, since we know
which version we are based on and can e.g. look at the history which
followed it upstream as part of a rebase.

The divergence we should be concerned with is when we take the code base
in a completely separate direction to upstream.

Ian.


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