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

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Date:	Thu, 5 May 2011 15:06:18 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.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, 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.

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