Re: 2.6.25-rc1 xen pvops regression

[H. Peter Anvin]

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
> > > Still curious about why a pagetable page is ending up in that range 
> > > though.  Seems like it shouldn't be possible, since we shouldn't be 
> > > allowed to allocate from those pages, at least until the DMI probe 
> > > has happened...  Unless the early allocator is only excluded from 
> > > e820 reserved pages, which would cause a problem on systems which 
> > > don't reserve the DMI space...  HPA?
> >
> > I thought the problem was a Xen-provided pagetable from before Linux 
> > started? 
>
> Hm, I don't think so.  The domain-builder pagetable is put after the 
> kernel, so it shouldn't be under 1M.

That's weird, then.  If we put a page table at 0xf0000, it would crash 
hard on real hardware (there is ROM there); as I mentioned, I do have 
hardware which both reserves and doesn't reserve this region.

	-hpa
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