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, 0 deletions

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 10bd053226..316d290579 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -525,6 +525,8 @@ int libxl_domain_create_restore(libxl_ctx *ctx, libxl_domain_config *d_config,
 
 void libxl_domain_config_init(libxl_domain_config *d_config);
 void libxl_domain_config_dispose(libxl_domain_config *d_config);
+int libxl_domain_remus_start(libxl_ctx *ctx, libxl_domain_remus_info *info,
+                             uint32_t domid, int send_fd, int recv_fd);
 int libxl_domain_suspend(libxl_ctx *ctx, libxl_domain_suspend_info *info,
                           uint32_t domid, int fd);