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Date:	Mon, 09 Mar 2009 18:07:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH] paravirt/xen: add pvop for page_is_ram

Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> A guest domain may have external pages mapped into its address space,
> in order to share memory with other domains.  These shared pages are
> more akin to io mappings than real RAM, and should not pass the
> page_is_ram test.  Add a paravirt op for this so that a hypervisor
> backend can validate whether a page should be considered ram or not.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 

Why are these pages mapped as RAM in the memory map?  That is the right
way to handle that, not by adding yet another bloody hook...

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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