[Xen-devel] [PATCH v12 0/2] x86/viridian improvements

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

This patch series incorporates several improvements to the code
supporting viridian (i.e. hyper-v compatible) enlightenments for
Windows guests:

Patch #1 series lays the foundations for adding new viridian
enlightenments such that they can be optionally enabled, and not
immediately exposed to a guest across a save/restore boundary.

Patch #2 adds support for the 'Partition Time Reference Counter'
enlightenment.

v2:
- Addressed comments from Jan Beulich
- Added patch #2

v3:
- Addressed comments from Andrew Cooper and Jan Beulich
- Re-worked patch #2
- Simplified patch #3 to use guest TSC

v4:
- Added missing domain info to printks in patch #2

v5:
- Clarified comment of patch #1 as suggested by David Vrabel
- More logging tweaks in patch #2 as suggested by Andrew Cooper

v6:
- Dropped previous patch to reduce logging verbosity as it has been
  applied
- Toolstack changes only:
  - New libxl_integer_list and libxl_viridian_enlightenment types to
    avoid passing of strings between xl and libxl, as requested by
    Ian Jackson.
  - Retained and deprecated viridian defbool rather than replacing it
    to avoid API breakage pointed out by Ian Campbell. Enlightenment list
    is now in a new hvm-only viridian_enlightenments field of the build
    info.

v7:
- Changes to patch #2 only:
  - Reference time calculation now makes use of struct time_scale and
    set_time_scale and scale_delta functions to avoid overflow issues
    pointed out by Christoph Egger.

v8:
- Changes to patch #2 only:
  - Fixed 32- to 64-bit type promotion issue as pointed out by
    Jan Beulich

v9:
- Changes to ocaml stubs in patch #1 only
  - There was a missing calloc in the libxl_integer_list ocaml stubs

v10:
- Toolstack changes only:
  - Re-worked toolstack code after discussion with Ian C and Ian J.
    See http://lists.xen.org/archives/html/xen-devel/2014-09/msg00416.html

v11:
- Toolstack changes only:
  - Re-worked toolstack code after further discussion with Ian J.

v12:
- Toolstack changes in patch #1 requested by Ian C
  - Bitfield width now #defined
- Remove cast from patch #2 as requested by Jan


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