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Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by

To: "H. Peter Anvin" <hpa@xxxxxxxxx>, hpa@xxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high' - does not work.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Thu, 5 May 2011 14:45:05 -0400
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, yinghai@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On Thu, May 05, 2011 at 12:28:49PM -0400, Konrad Rzeszutek Wilk wrote:
> > >> OK, sounds like a plan then.  I like it because it doesn't affect the
> > >> native kernel.
> .. snip..
> > First things first... are you pushing the workaround (you can add my
> > Acked-by:) or should I?
> Grrr.. While it works on my machines, it does not work on some of the AMD 
> opteron
> CPU machines. I asked Stefan Bader from Canonical to run a simple bootup test 
> with
> 2.6.39-rc6 (Linus picked it already), and if it crashed, to use the 
> one that Stefano came up with.
> And sure enough - it crashed and Stefano's fix worked. I've Stefano's
> patch in stable/bug-fixes-for-x86 and I am OK reverting the fix I came up.

To make it easier, I made a branch called 


that has all the right magic sauce in it:

Konrad Rzeszutek Wilk (1):
      Revert "xen/mmu: Add workaround "x86-64, mm: Put early page table high""

Sedat Dilek (1):
      x86/mm: Fix section mismatch derived from native_pagetable_reserve()

Stefano Stabellini (1):
      x86,xen: introduce x86_init.mapping.pagetable_reserve

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