libxl: Remus - suspend/postflush/commit callbacks

 * Add libxl callback functions for Remus checkpoint suspend, postflush
   (aka resume) and checkpoint commit callbacks.
 * suspend callback is a stub that just bounces off
   libxl__domain_suspend_common_callback - which suspends the domain and
   saves the devices model state to a file.
 * resume callback currently just resumes the domain (and the device model).
 * commit callback just writes out the saved device model state to the
   network and sleeps for the checkpoint interval.
 * Introduce a new public API, libxl_domain_remus_start (currently a stub)
   that sets up the network and disk buffer and initiates continuous
   checkpointing.

 * Future patches will augment these callbacks/functions with more functionalities
   like issuing network buffer plug/unplug commands, disk checkpoint commands, etc.

Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 551e367107..a21bd85fa8 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -454,6 +454,12 @@ libxl_sched_sedf_domain = Struct("sched_sedf_domain", [
     ("weight", integer),
     ])
 
+libxl_domain_remus_info = Struct("domain_remus_info",[
+    ("interval",     integer),
+    ("blackhole",    bool),
+    ("compression",  bool),
+    ])
+
 libxl_event_type = Enumeration("event_type", [
     (1, "DOMAIN_SHUTDOWN"),
     (2, "DOMAIN_DEATH"),