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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] "Iomem mapping not permitted" during windows crash dump under GPLPV
From: Paul Durrant <paul.durrant@xxxxxxxxxx>
Date: Tue, 2 Feb 2010 10:24:25 +0000
Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Keir Fraser wrote:
On 30/01/2010 08:30, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

So there is definitely nothing I could tell Xen to do with a DomU PFN
that would remove the p2m mapping?

If you balloon out a page, that would do it.


Yes, it certainly would and I've seen it many times. I'm fairly sure that by just ignoring the failed block writes coming back from blkback/tap and carrying on you still end up with a usable MEMORY.DMP after reboot.

  Paul

--
===============================
Paul Durrant, Software Engineer

Citrix Systems (R&D) Ltd.
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