Re: [Xen-devel] xentrace, arm, hvm

[Pavlo Suikov <pavlo.suikov@xxxxxxxxxxxxxxx>]

Hi,

>
> >  > To support xentrace on ARM, we will need at least:
> >
> > I would readily do that if you give me some directions on where to look
> > at, or a high-level explanation of:
> >
> >  > - to replace rcu_lock_domain_by_any_id() by a a similar function
> >
> > What semantics should this function have?
>
> I would copy in part get_pg_owner (arch/x86/mm/mm.c) in the ARM code.
> The check "unlikely(paging_mode_translate(curr))" will always fail on ARM.

> Probably best just to dig in and ask questions as issues arise.

After making a quick workaround to rcu_lock DOMAIN_XEN on arm (in the quite same manner it is done in x86) I've faced different problem. Specifically, p2m_lookup for an address in the xen restricted heap fails on the very first map call: p2m_map_first returns zero page due to both p2m->first_level and p2m_first_level_index(addr) equal to zero. As far as I understand xen simply does not know how to make p2m translation for it's own restricted heap on arm. Am I right?

Regards,

  Pavlo

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