[PATCH RFC 0/4] remove libxenctrl usage from xenstored

[Juergen Gross <jgross@xxxxxxxx>]

Xenstored is using libxenctrl for only one purpose: to get information
about state of domains.

This RFC patch series is removing that dependency by introducing a new
stable interface which can be used by xenstored instead.

I have chosen to add a new hypercall with sub-commands. This can be
changed, of course, but I thought this would be a good step towards
stable control interfaces for the Xen tools.

I have done only very little testing (basically normal domain creation
and deletion). In case my approach is being accepted I'll do a more
thorough test.

What is missing right now is some cleanup (e.g. the need to allow
the dominfo operation of the domctl hypercall for a stubdom based
Xenstore could be removed). For Mini-OS some more work is needed to
remove the dependency to libxenctrl for xenstore-stubdom, as Mini-OS
can't be configured to use libxenevent and libxengnttab, but not
libxenctrl today. Again, I'll do that cleanup in case the series is
generally accepted.

Juergen Gross (4):
  xen: add a domain unique id to each domain
  xen: add bitmap to indicate per-domain state changes
  xen: add new stable control hypercall
  tools/xenstore: use new stable interface instead of libxenctrl

 tools/flask/policy/modules/dom0.te  |   2 +-
 tools/xenstore/Makefile             |   3 +-
 tools/xenstore/xenstored_control.c  |  14 +-
 tools/xenstore/xenstored_domain.c   | 219 +++++++++++++++-------------
 xen/arch/arm/traps.c                |   1 +
 xen/arch/x86/hvm/hypercall.c        |   1 +
 xen/arch/x86/hypercall.c            |   1 +
 xen/arch/x86/pv/hypercall.c         |   1 +
 xen/common/Makefile                 |   1 +
 xen/common/control.c                |  52 +++++++
 xen/common/domain.c                 |  76 ++++++++++
 xen/common/event_channel.c          |  11 +-
 xen/include/Makefile                |   1 +
 xen/include/public/control.h        |  80 ++++++++++
 xen/include/public/xen.h            |   1 +
 xen/include/xen/event.h             |   6 +
 xen/include/xen/hypercall.h         |   5 +
 xen/include/xen/sched.h             |   7 +
 xen/include/xsm/dummy.h             |  14 ++
 xen/include/xsm/xsm.h               |   6 +
 xen/xsm/dummy.c                     |   1 +
 xen/xsm/flask/hooks.c               |   6 +
 xen/xsm/flask/policy/access_vectors |   2 +
 23 files changed, 402 insertions(+), 109 deletions(-)
 create mode 100644 xen/common/control.c
 create mode 100644 xen/include/public/control.h

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2.26.2