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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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