linux-kernel - Re: [PATCH 1/2] xen/mmu: Add workaround "x86-64, mm: Put early page table high"

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Message-ID: <20110509070659.GA17552@router-fw-old.local.net-space.pl>
Date:	Mon, 9 May 2011 09:06:59 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Daniel Kiper <dkiper@...-space.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 1/2] xen/mmu: Add workaround "x86-64, mm: Put early page table high"

On Thu, May 05, 2011 at 03:06:18PM +0100, Stefano Stabellini wrote:
> On Thu, 5 May 2011, Konrad Rzeszutek Wilk wrote:
> > > In any case you are right about the fact that the change is not needed
> > > on X86_32 so if it has any bad side effects on X86_32 we can always do
> >
> > Why not? Can't you boot a 32-bit Dom0 on those machines?
>
> Because e820_end_of_low_ram_pfn() is not called on 32-bit,
> find_low_pfn_range() is called instead and works differently.
> AFAICT find_low_pfn_range() is not affected by the issue described in
> the previous email.

Yes, you are right. Additionally, I tested your patch with my amendments ealier
and it works on i386. I am going to prepare relevant patch today or tomorrow.

Daniel
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