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Re: [Xen-devel] Requesting for freeze exception for ARM/ITS patches

On Mon, 13 Jul 2015, Wei Liu wrote:
> On Fri, Jul 10, 2015 at 04:16:07PM +0530, Vijay Kilari wrote:
> > Hi Wei,
> > 
> >     I would like to have freeze exception for ITS feature on ARM64.
> > Design got freeze few weeks back and I have sent v4 version of patch series
> > today.
> > 
> > This patches will not impact any generic code of other platforms and have 
> > minor
> > changes generic arm related code. Also these patches are only for
> > ARM64 platform.
> > 
> > These patches are pre-requisite for PCI support / Pass-through support
> > on ARM64 platforms.
> > 
> > The risk is minor and as of today only used by Cavium ThunderX platform.
> > 
> I'm not a ARM expert, but last time I checked most patches in v3 are not
> acked.
> I also got conflict statements from maintainers and core developer. I
> will wait a bit for them clarify the situation.
> But as Ian said, if you can't post v4 and get most if all of your
> patches acked / reviewed early this week, my answer to this request
> would be no.

I pretty much agree with Ian: I went through the patches and the impact
of the series on non-ITS platforms will be null after Vijay addresses:

- the lpi irq_desc and irq_pending allocation issues
- improve lpi_supported to check for ITS presence

these two changes should be trivial and are certainly necessary for a
freeze exception in my view.

On this basis, if Vijay manages to resend a v5 version on time with
those two issues covered, making sure that the new code is not enabled
unless an its is present, then I think that a freeze exception would be
OK as the risk would be zero.

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