[PATCH v2] Add build-id to XENVER hypercall.

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

Since v1 (http://lists.xen.org/archives/html/xen-devel/2015-10/msg01090.html)
 - Made it work on EFI
 - Compiles on ARM
 - Redid it per comments.

Attached are the three patches that will add XENVER_build_id and
add the proper bits in libxl/libxc.

However they also change the behavior of the existing hypercall
for XENVER_[compile_info|changeset|commandline|extraversion] - that
is they return the string '<denied>'.

This is with XSM enabled or disabled.

The new sub-ops - XENVER_build_id on the other hand will return
-EPERM (XSM or not) for !priv guests.

Please take a look and provide your feedback at your leisure.

 tools/flask/policy/policy/modules/xen/xen.te |  9 +++++
 tools/libxc/xc_private.c                     |  7 ++++
 tools/libxc/xc_private.h                     | 10 ++++++
 tools/libxl/libxl.c                          | 24 +++++++++++++
 tools/libxl/libxl.h                          |  5 +++
 tools/libxl/libxl_types.idl                  |  1 +
 tools/libxl/xl_cmdimpl.c                     |  1 +
 xen/arch/x86/Makefile                        | 14 +++++---
 xen/arch/x86/xen.lds.S                       |  6 ++++
 xen/common/kernel.c                          | 54 +++++++++++++++++++++++-----
 xen/common/version.c                         | 41 +++++++++++++++++++++
 xen/include/public/version.h                 | 15 +++++++-
 xen/include/xen/version.h                    |  2 ++
 xen/include/xsm/dummy.h                      | 18 ++++++++++
 xen/include/xsm/xsm.h                        |  6 ++++
 xen/xsm/dummy.c                              |  1 +
 xen/xsm/flask/hooks.c                        | 22 ++++++++++++
 xen/xsm/flask/policy/access_vectors          |  4 +++
 18 files changed, 226 insertions(+), 14 deletions(-)


Konrad Rzeszutek Wilk (2):
      xsm/xen_version: Add XSM for the xen_version hypercall.
      libxl: info: Display build_id of the hypervisor.

Martin Pohlack (1):
      XENVER_build_id: Provide ld-embedded build-ids