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Re: [Xen-devel] "Iomem mapping not permitted" during windows crash dump

To: Jan Beulich <JBeulich@xxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>
Subject: Re: [Xen-devel] "Iomem mapping not permitted" during windows crash dump under GPLPV
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 02 Feb 2010 14:33:55 +0000
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On 02/02/2010 14:26, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>> There is no question - it just has to support this. Linux would not work
>>> without this (nor can I imagine any other OS would).
>> 
>> I don't think a page can be simultaneously mapped at multiple locations in a
>> guest's p2m though.
> 
> Aren't we talking about HVM guests here? If the guest maps a page, it
> doesn't know about the p2m.

I mean that under normal circumstances Xen itself won't let the page be
installed in multiple p2m slots. It will remove it from the old one beforee
installing it at a new one.

 -- Keir



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