Re: [Xen-devel] [PATCH v3 2/5] xentrace: Memory/Page Mapping support for DOMID_XEN on ARM

[Julien Grall <julien.grall@xxxxxxx>]

On 14/04/16 20:52, Ben Sanda wrote:
> Julien, George, Andrew, and Stefano,
Hello Ben,

Sorry for the late answer, we were at the Xen hackathon.

> > Thank you for the explanation.
> >
> > The ARM implementation of share_xen_page_with_guest is nearly the same
> > as the x86 one. However, the type is never used so far for the P2M
> > code.
> >
> > So far, all ARM domains have been auto-translated. DOMID_XEN is the
> > first non auto-translated domain.
> >
> > We could make DOMID_XEN an auto-translated domain by introducing page
> > table for dummy domain. This would make the code cleaner but use more
> > memory (allocation of 3 level of page tables).
> >
> > Stefano, do you have any opinions on this?
> How would you like to me proceed with this issue with regard to the
> patch set? It sounds like this is a more far reaching architecture
> design question for ARM. I have made the other changes to this version
> of the code requested, should I submit v4? Or wait for a further
> resolution to this discussion?
This patch is the meat of this series. The result of the discussion may 
change drastically the way this series add support to map xenhap page in 
the guest.
So I would wait until we agree on the solution.

Regards,

--
Julien Grall

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