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RE: [Xen-devel] what happens when a PoD page is touched?

from [Jan Beulich] [Permanent Link][Original]
To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] what happens when a PoD page is touched?
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Wed, 18 May 2011 11:23:22 +0100
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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>>> On 18.05.11 at 06:52, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:
> Just taking a step back for a sec, maybe I'm doing something else wrong.
> My balloon down code allocates memory from Windows with
> MmAllocatePagesForMdlEx then hands the pages to Xen with
> XENMEM_decrease_reservation. Is that all I need to do? I notice that
> Linux makes a call to set_phys_to_machine(INVALID_P2M_ENTRY) for each
> page, even in the hvm case. Is that some function I need to mirror too
> or is that just internal Linux housekeeping and not required under
> Windows?

Probably not: In the HVM case this function degenerates to just a
couple of BUG_ON()s.

Jan


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