Re: [Xen-devel] [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings

["Andres Lagar-Cavilla" <andres@xxxxxxxxxxxxxxxx>]

> At 07:47 +0000 on 01 Mar (1330588073), Ian Campbell wrote:
>> > > Is there no scope for making these pages owned by the domain but not
>> > > actually part of the P2M? We can cope with that for other types of
>> magic
>> > > page, can't we?
>
> It would need a new operation to map the ring into the tool that uses
> it; normal map-foreign-page ops need a GFN.

Actually, confirmed: we can call xc_domain_decrease_reservation on the
ring after it's mapped by the helper. Guest won't get at it. Nothing
breaks.

I'll send it as follow-up patch (for xenpaging and xen-access) once this
series is finalized.

Thanks,
Andres
>
> But that sounds like a good idea all the same.
>
> Tim.
>



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