linux-kernel - Re: [PATCH 0/3] xen: Fix oops when mapping/unmapping addr above 1Gb

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Date:	Wed, 02 Apr 2008 15:35:43 +0100
From:	Mark McLoughlin <markmc@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 0/3] xen: Fix oops when mapping/unmapping addr above 1Gb

On Mon, 2008-03-31 at 07:55 -0700, Jeremy Fitzhardinge wrote:
> Ingo Molnar wrote:
> > * Mark McLoughlin <markmc@...hat.com> wrote:
> >   
> >>         In Fedora rawhide we're currently seeing oopses whenever a 
> >> processes dlopen()s a library which prelink() has previously relocated 
> >> above 1Gb. Some more details at:
> >>
> >>   https://bugzilla.redhat.com/436453
> >>
> >>         The issue seems to be that during xen_pgd_pin(), we only pin 
> >> PTE pages, but xen's release_pmd() tries to unpin PMD pages too.
> >>
> >>         The following series of patches is against the latest x86 
> >> tree.
> >>     
> >
> > thanks, i've picked them up to get them tested - but it would be nice to 
> > have an ack from Jeremy as well. This seems like v2.6.25 material as 
> > well, right?
> 
> Didn't I reply?  Anyway, the patch looks good.  It's definitely 2.6.25 
> material; its fallout from the changes I did to dynamically 
> allocate/deallocate pmds rather than always do them with the pgd.

Okay, here are the patches rebased to 2.6.25-rc8.

I've reproduced the issue with plain -rc8 and confirmed the patches fix
it.

Cheers,
Mark.

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