Re: [Xen-devel] transferring ownership of domheap pages

To:	Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] transferring ownership of domheap pages
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Fri, 13 Feb 2009 08:50:54 +0000
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On 13/02/2009 00:59, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> I'd like to have routines to transfer ownership
> of a page both from domain D1 to anonymous and
> from anonymous to domain D2, without the necessity
> of doing a free_domheap_pages followed by an
> alloc_domheap_pages (primarily because I don't
> want to scrub the page as I know it will be
> immediately overwritten by the new owner).
> The anon-to-D2 would fail (return NULL) if
> D2 is fully allocated.
> 
> Any problems to watch out for?

See (and use) mm.c:steal_page(). Only works of course if D1 has no mappings
of the page.

 -- Keir



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Re: [Xen-devel] transferring ownership of domheap pages