[Xen-ia64-devel] [RFC][PATCH] foreign domain p2m table exposure

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Hi.
This patch isn't finished. Xen and kernel part is implemented
and only compile-tested.
But I wanted to get comment before starting rewriting
libxc save/restore/dump-core.


Currently the already implemented p2m table exposure is self exposure.
It is used by kernel to optimize the gpfn -> mfn conversion.
On the other hand, What I call foreign domain p2m table exposure is
to expose the p2m table of a given domain to dom0.
In particular, libxc save/restore/dump-core in my mind.
They can be improved as follows.

What do you think about those?
- save
  xc_get_pfn_list() is obsoleted, but it uses xc_ia64_get_pfn_list().
  So save shouldn't use it.

- restore
  Currently it allocates all the pages for a domain,
  and deallocates pages which isn't used as the last step.
  It can allocate pages on demand.

- dump-core
  Currently 'xm dump-core' produces a ton of "non-allocated mpa" warning
  message, it's very annoying.
  It can be elminated.


The basic logic is same as self p2m exposure, however
the implementation is a little bit more complicated than
self p2m exposure because
  - it needs to track exposing to prevent a domain from destroying.
  - it needs to support unexposing.

Thanks.
-- 
yamahata

15146_8ebdf907115d_foreign_domain_p2m_exposure.patch
Description: Text Data

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