[PATCH v2 3/9] powerpc/powernv: Remove real mode access limit for early allocations
Nicholas Piggin
npiggin at gmail.com
Tue Aug 15 22:10:54 AEST 2017
On Mon, 14 Aug 2017 23:13:07 +1000
Benjamin Herrenschmidt <benh at au1.ibm.com> wrote:
> On Mon, 2017-08-14 at 22:49 +1000, Michael Ellerman wrote:
> > > - /*
> > > - * We limit the allocation that depend on ppc64_rma_size
> > > - * to first_memblock_size. We also clamp it to 1GB to
> > > - * avoid some funky things such as RTAS bugs.
> >
> > That comment about RTAS is 7 years old, and I'm pretty sure it was a
> > historical note when it was written.
> >
> > I'm inclined to drop it and if we discover new bugs with RTAS on Power9
> > then we can always put it back.
>
> Arent' we using a 32-bit RTAS ? (Afaik there's a 64-bit one, we just
> never used it ..). In this case we need to at least clamp to 2G (no
> trust RTAS doing unsigned properly).
Is there any allocation not covered by RTAS_INSTANTIATE_MAX?
Thanks,
Nick
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