Re: [Xen-devel] [PATCH v5 4/9] xen: introduce XEN_DOMCTL_devour

[Tim Deegan <tim@xxxxxxx>]

At 13:53 +0000 on 13 Jan (1421153637), Ian Campbell wrote:
> On Thu, 2014-12-11 at 14:45 +0100, Vitaly Kuznetsov wrote:
> > +            gmfn = mfn_to_gmfn(d, mfn);
> 
> (I haven't thought about it super hard, but I'm taking it as given that
> this approach to kexec is going to be needed for ARM too, since that
> seems likely)
> 
> mfn_to_gmfn is going to be a bit pricey on ARM, we don't have an m2p to
> refer to, I'm not sure what we would do instead, walking the p2m looking
> for mfns surely won't be a good idea!
> 
> An alternative approach to this might be to walk the guest p2m (with
> appropriate continuations) and move each domheap page (this would also
> help us preserve super page mappings). It would also have the advantage
> of not needing additional stages in the destroy path and state in struct
> domain etc, since all the action would be constrained to the one
> hypercall.
> 
> x86 folks, would that work for your p2m too?

Without having looked at the details, it sounds plausible to me.

Tim.

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