Re: 2.6.25-rc1 xen pvops regression

Joel Becker
2008-02-21T23:01:22Z

On Thu, Feb 21, 2008 at 10:12:36PM +0000, Ian Campbell wrote:
>
> On Thu, 2008-02-21 at 13:37 -0800, 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.
>
> I can confirm that it is Linux which is allocating it. The call path:

Also, I have older kernels (2.6.24-rc era) that run Just Fine.
I haven't changed my dom0 at all.

Joel

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Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127