linux-kernel - Re: [Xen-devel] [PATCH 11/11] xen/mmu: Release just the MFN list, not MFN list and part of pagetables.

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Message-ID: <alpine.DEB.2.02.1208211626470.15568@kaball.uk.xensource.com>
Date:	Tue, 21 Aug 2012 16:27:53 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [Xen-devel] [PATCH 11/11] xen/mmu: Release just the MFN list,
 not MFN list and part of pagetables.

On Tue, 21 Aug 2012, Konrad Rzeszutek Wilk wrote:
> On Tue, Aug 21, 2012 at 03:18:26PM +0100, Stefano Stabellini wrote:
> > On Thu, 16 Aug 2012, Konrad Rzeszutek Wilk wrote:
> > > We call memblock_reserve for [start of mfn list] -> [PMD aligned end
> > > of mfn list] instead of <start of mfn list> -> <page aligned end of mfn list].
> > > 
> > > This has the disastrous effect that if at bootup the end of mfn_list is
> > > not PMD aligned we end up returning to memblock parts of the region
> > > past the mfn_list array. And those parts are the PTE tables with
> > > the disastrous effect of seeing this at bootup:
> > 
> > This patch looks wrong to me.
> 
> Its easier to see if you stick the patch in the code. The size = part
> was actually also done earlier.

Yes, you are right, I see that know.
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