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, 2 insertions, 1 deletions

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index e76723d124..49d01a857a 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -757,7 +757,8 @@ _hidden int libxl__domain_restore_common(libxl__gc *gc, uint32_t domid,
                                          int fd);
 _hidden int libxl__domain_suspend_common(libxl__gc *gc, uint32_t domid, int fd,
                                          libxl_domain_type type,
-                                         int live, int debug);
+                                         int live, int debug,
+                                         const libxl_domain_remus_info *r_info);
 _hidden const char *libxl__device_model_savefile(libxl__gc *gc, uint32_t domid);
 _hidden int libxl__domain_suspend_device_model(libxl__gc *gc, uint32_t domid);
 _hidden int libxl__domain_resume_device_model(libxl__gc *gc, uint32_t domid);