[libvirt] [ PATCH v5 0/4] API to invoke S3/S4 on a host and also resume from within libvirt

[Srivatsa S. Bhat]

This patchset adds a new API to put a host to a suspended state
(Suspend-to-RAM, Suspend-to-Disk or Hybrid-Suspend) 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.

This patch applies on top of the Hybrid-Suspend patch posted in [1].

v5:
   * Added MIN_TIME_REQ_FOR_SUSPEND.
   * Incorporated the review comments in [3].

v4:
   * Applies on top of the Hybrid-Suspend patch posted in [1].
   * Incorporated the review comments in [2].

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-November/msg01407.html
[2]. http://thread.gmane.org/gmane.comp.emulators.libvirt/47950
[3]. http://thread.gmane.org/gmane.comp.emulators.libvirt/49054

Srivatsa S. Bhat (4):
      Add a public API to invoke suspend/resume on the host
      Add the remote protocol implementation for virNodeSuspendForDuration
      Implement the core API to suspend/resume the host
      Add virsh command to initiate suspend on the host


 include/libvirt/libvirt.h.in |   16 ++
 src/Makefile.am              |    1 
 src/driver.h                 |    6 +
 src/libvirt.c                |   65 ++++++++++
 src/libvirt_private.syms     |    5 +
 src/libvirt_public.syms      |    5 +
 src/lxc/lxc_driver.c         |    2 
 src/qemu/qemu_driver.c       |    2 
 src/remote/remote_driver.c   |    1 
 src/remote/remote_protocol.x |   10 +-
 src/uml/uml_driver.c         |    2 
 src/util/virnodesuspend.c    |  269 ++++++++++++++++++++++++++++++++++++++++++
 src/util/virnodesuspend.h    |   36 ++++++
 src/xen/xen_driver.c         |    2 
 tools/virsh.c                |   64 ++++++++++
 tools/virsh.pod              |    7 +
 16 files changed, 491 insertions(+), 2 deletions(-)
 create mode 100644 src/util/virnodesuspend.c
 create mode 100644 src/util/virnodesuspend.h