Re: [Xen-devel] [PATCH 0 of 3] Update paging/sharing/access interfaces v2

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 10/02/2012 11:45, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

>> Actually, this hiatus allows me to float a perhaps cleaner way to map the
>> ring: the known problem is that the pager may die abruptly, and Xen is
>> still posting events to a page now belonging to some other dom0 process.
>> This is dealt with in the qemu-dm case by stuffing the ring in an unused
>> pfn (presumably somewhere in the mmio hole?)
>> 
>> Would that work? Is there a policy for parceling out these "magic pfn's"?
> 
> I was just thinking about this issue. The bug is that the ring lives in
> dom0, the page should belong to domU and should be destroyed along with
> it. And ring users in dom0 should request (and maybe initially allocate
> and setup) a certain gfn belonging to domU.

Yes indeed. The gpfn could be allocated by the domain builder, or by
hvmloader (which might be too late!).

 -- Keir
 



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