Xen devel - May 2013 - Mapping HVM memory to dom0 address space

Hi,

Is it possible to map domU pages based on PFNs in that domain? Or is it
possible to get MFNs from inside of HVM?
For PV guests I can MFNs from inside of guest, then pass it to
xc_map_foreign_pages in dom0, how achieve the same for HVM?
I have PV drivers inside of that domain if that helps.

It isn''t possible directly, how is most efficient way to translate a
bunch of
PFNs to MFNs for a given domain? xc_get_pfn_list, or there is something better?

-- 
Best Regards,
Marek Marczykowski
Invisible Things Lab



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At 14:42 +0200 on 21 May (1369147374), Marek Marczykowski
wrote:
> Hi,
> 
> Is it possible to map domU pages based on PFNs in that domain? Or is it
> possible to get MFNs from inside of HVM?
> For PV guests I can MFNs from inside of guest, then pass it to
> xc_map_foreign_pages in dom0, how achieve the same for HVM?
For HVM domains, all the mapping functions take PFNs, so I think it
should Just Work.  (Memory operations on both PV and HVM memory use
''GFNs'', i.e. the same namespace that the guest puts in its own
pagetables).
> It isn''t possible directly, how is most efficient way to translate
a bunch of
> PFNs to MFNs for a given domain? xc_get_pfn_list, or there is something
better?
For HVM domains, I don''t think it''s possible; for PV guests
you need the
assitance of the guest itself.  But because all the mapping APIs &c take
GFNs, hopefully it''s not necessary.

Cheers,

Tim.