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Re: [Xen-devel] Regarding page table management changes from Xen v1to Xe

To: Anthony Liguori <aliguori@xxxxxxxxxx>
Subject: Re: [Xen-devel] Regarding page table management changes from Xen v1to Xen v2 (and v3)
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 27 Apr 2006 09:23:33 +0100
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Himanshu Raj <rhim@xxxxxxxxxxxxx>
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On 27 Apr 2006, at 00:33, Anthony Liguori wrote:

Couldn't we temporarily map the page table page? Not that we would actually want to do that. Just trying to confirm my understand.

Sure, but that's expensive on 32b as map_domain_mem has to do real work
(it's cheap on 64b as we have a 1-to-1 map of machine memory).

Excellent, that's just what I thought.

Thanks Ian!

Where do you get the machine address of the page to map, given a linear address at the hypercall interface? You'd still need a linear mapping access, but you'd want to read out the pde not the pte.

 -- Keir

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