Re: [Xen-devel] Pinning L1 page table with wrpt

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15 Aug 2005, at 09:55, Jacob Gorm Hansen wrote:

> And then Xen will pin them for me recursively, or they will not be
> pinned at all but just checked against having writable references? I
> seem to have a problem when combining writable pagetables and the
> traditional pinned ones in the same domain. The pagetables I inherit
> from the domain builder need to be unpinned before I can use the pages
> they reference for my own page tables, or I get complaints about trying
> to create a writable linear p.t.
Xen will infer their type when you pin the L2. At that point, they 
behave exactly the same as a pinned L1, until they are detached from 
the pinned L2 or the L2 itself is unpinned.
We play games with the initial p.t. in linux 2.6 as well. The code in 
arch/xen/i386/mm/init.c might be worth looking at, although it's pretty 
twisted stuff!
 -- Keir


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