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[libvirt] [PATCH v3 0/2] API to invoke S3/S4 on a host and also resume from within libvirt



(This patch is positioned to go in after the patch that exports the host
power management capabilities as XML, posted in [4])

This patch adds a new API to put a host to a suspended state (either
Suspend-to-RAM or Suspend-to-Disk) and setup a timed resume to get the
host back online, from within libvirt.
This uses the RTC wakeup mechanism to set up a timer alarm before
suspending the host, so that in-band resume is facilitated by the firing
of the RTC alarm, which wakes up the host.

The decision to use the RTC Wakeup mechanism to resume the host from
sleep was taken in [1]. An initial API was discussed in [2].
Some design ideas for the asynchronous mechanism implementation was
discussed in [3].

v3:
   * Rebased to libvirt 0.9.7
   * Added a check to see if alarmTime (suspend duration) is within an
     acceptable range.

v2:
   * Added an init function which finds out if S3/S4 is supported by the host,
     upon the first request to suspend/hibernate.
   * Added synchronization/locking to ensure that only one suspend operation
     is active at a time.

v1: http://www.redhat.com/archives/libvir-list/2011-September/msg00830.html
v2: http://comments.gmane.org/gmane.comp.emulators.libvirt/46729

References:
[1]. http://www.redhat.com/archives/libvir-list/2011-August/msg00327.html
[2]. http://www.redhat.com/archives/libvir-list/2011-August/msg00248.html
[3]. http://www.redhat.com/archives/libvir-list/2011-September/msg00438.html
[4]. http://www.redhat.com/archives/libvir-list/2011-November/msg00378.html

Srivatsa S. Bhat (2):
      Implement the asynchronous suspend and RTC wakeup
      Make the API public


 include/libvirt/libvirt.h.in |    9 ++
 src/driver.h                 |    5 +
 src/libvirt.c                |   48 +++++++++
 src/libvirt_private.syms     |    7 +
 src/libvirt_public.syms      |    1 
 src/nodeinfo.c               |  220 ++++++++++++++++++++++++++++++++++++++++++
 src/nodeinfo.h               |   14 +++
 src/qemu/qemu_driver.c       |    6 +
 src/remote/remote_driver.c   |    1 
 src/remote/remote_protocol.x |   12 ++
 src/util/threads-pthread.c   |   17 +++
 src/util/threads.h           |    1 
 12 files changed, 339 insertions(+), 2 deletions(-)



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