linux-kernel - Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'

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Date:	Thu, 5 May 2011 14:45:05 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>, hpa@...ux.intel.com
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com, yinghai@...nel.org,
	linux-kernel@...r.kernel.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced
 by 'x86-64, mm: Put early page table high' - does not work.

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 

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/bug-fixes-for-rc6

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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