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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC PATCH COLO v5 09/29] move remus related codes to libxl_remus.c
From: Wen Congyang <wency@xxxxxxxxxxxxxx>
libxl_domain_remus_start() is external API, and is not moved.
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Cc: Shriram Rajagopalan <rshriram@xxxxxxxxx>
---
tools/libxl/Makefile | 2 +-
tools/libxl/libxl.c | 57 +--------
tools/libxl/libxl_dom.c | 220 +-------------------------------
tools/libxl/libxl_remus.c | 318 ++++++++++++++++++++++++++++++++++++++++++++++
tools/libxl/libxl_remus.h | 28 ++++
5 files changed, 352 insertions(+), 273 deletions(-)
create mode 100644 tools/libxl/libxl_remus.c
create mode 100644 tools/libxl/libxl_remus.h
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 1b16598..7eeda0e 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -56,7 +56,7 @@ else
LIBXL_OBJS-y += libxl_nonetbuffer.o
endif
-LIBXL_OBJS-y += libxl_remus_device.o libxl_remus_disk_drbd.o
+LIBXL_OBJS-y += libxl_remus.o libxl_remus_device.o libxl_remus_disk_drbd.o
LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o libxl_psr.o
LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 58629ed..bcbd961 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -17,6 +17,7 @@
#include "libxl_osdeps.h"
#include "libxl_internal.h"
+#include "libxl_remus.h"
#define PAGE_TO_MEMKB(pages) ((pages) * 4)
#define BACKEND_STRING_SIZE 5
@@ -842,11 +843,6 @@ out:
GC_FREE;
return ptr;
}
-
-static void libxl__remus_setup_done(libxl__egc *egc,
- libxl__remus_devices_state *rds, int rc);
-static void libxl__remus_setup_failed(libxl__egc *egc,
- libxl__remus_devices_state *rds, int rc);
static void remus_failover_cb(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc);
@@ -895,63 +891,14 @@ int libxl_domain_remus_start(libxl_ctx *ctx,
libxl_domain_remus_info *info,
assert(info);
- /* Convenience aliases */
- libxl__remus_devices_state *const rds = &dss->rds;
-
- if (libxl_defbool_val(info->netbuf)) {
- if (!libxl__netbuffer_enabled(gc)) {
- LOG(ERROR, "Remus: No support for network buffering");
- rc = ERROR_FAIL;
- goto out;
- }
- rds->device_kind_flags |= (1 << LIBXL__DEVICE_KIND_VIF);
- }
-
- if (libxl_defbool_val(info->diskbuf))
- rds->device_kind_flags |= (1 << LIBXL__DEVICE_KIND_VBD);
-
- rds->ao = ao;
- rds->domid = domid;
- rds->callback = libxl__remus_setup_done;
-
/* Point of no return */
- libxl__remus_devices_setup(egc, rds);
+ libxl__remus_setup(egc, dss);
return AO_INPROGRESS;
out:
return AO_ABORT(rc);
}
-static void libxl__remus_setup_done(libxl__egc *egc,
- libxl__remus_devices_state *rds, int rc)
-{
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
- STATE_AO_GC(dss->ao);
-
- if (!rc) {
- libxl__domain_suspend(egc, dss);
- return;
- }
-
- LOG(ERROR, "Remus: failed to setup device for guest with domid %u, rc %d",
- dss->domid, rc);
- rds->callback = libxl__remus_setup_failed;
- libxl__remus_devices_teardown(egc, rds);
-}
-
-static void libxl__remus_setup_failed(libxl__egc *egc,
- libxl__remus_devices_state *rds, int rc)
-{
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
- STATE_AO_GC(dss->ao);
-
- if (rc)
- LOG(ERROR, "Remus: failed to teardown device after setup failed"
- " for guest with domid %u, rc %d", dss->domid, rc);
-
- dss->callback(egc, dss, rc);
-}
-
static void remus_failover_cb(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc)
{
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index a3fce46..4693d32 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -19,6 +19,7 @@
#include "libxl_internal.h"
#include "libxl_arch.h"
+#include "libxl_remus.h"
#include <xc_dom.h>
#include <xen/hvm/hvm_info_table.h>
@@ -1807,194 +1808,6 @@ static void
domain_suspend_callback_common_done(libxl__egc *egc,
libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
}
-/*----- remus callbacks -----*/
-static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
- libxl__domain_suspend_state2 *dss2, int ok);
-static void remus_devices_postsuspend_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc);
-static void remus_devices_preresume_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc);
-
-static void libxl__remus_domain_suspend_callback(void *data)
-{
- libxl__save_helper_state *shs = data;
- libxl__egc *egc = shs->egc;
- libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
-
- /* Convenience aliases */
- libxl__domain_suspend_state2 *const dss2 = &dss->dss2;
-
- dss2->callback_common_done = remus_domain_suspend_callback_common_done;
- domain_suspend_callback_common(egc, dss2);
-}
-
-static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
- libxl__domain_suspend_state2 *dss2, int ok)
-{
- libxl__domain_suspend_state *dss = CONTAINER_OF(dss2, *dss, dss2);
-
- if (!ok)
- goto out;
-
- libxl__remus_devices_state *const rds = &dss->rds;
- rds->callback = remus_devices_postsuspend_cb;
- libxl__remus_devices_postsuspend(egc, rds);
- return;
-
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
-}
-
-static void remus_devices_postsuspend_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc)
-{
- int ok = 0;
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
-
- if (rc)
- goto out;
-
- ok = 1;
-
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
-}
-
-static void libxl__remus_domain_resume_callback(void *data)
-{
- libxl__save_helper_state *shs = data;
- libxl__egc *egc = shs->egc;
- libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
- STATE_AO_GC(dss->ao);
-
- libxl__remus_devices_state *const rds = &dss->rds;
- rds->callback = remus_devices_preresume_cb;
- libxl__remus_devices_preresume(egc, rds);
-}
-
-static void remus_devices_preresume_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc)
-{
- int ok = 0;
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
- STATE_AO_GC(dss->ao);
-
- if (rc)
- goto out;
-
- /* Resumes the domain and the device model */
- rc = libxl__domain_resume(gc, dss->domid, /* Fast Suspend */1);
- if (rc)
- goto out;
-
- ok = 1;
-
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
-}
-
-/*----- remus asynchronous checkpoint callback -----*/
-
-static void remus_checkpoint_dm_saved(libxl__egc *egc,
- libxl__domain_suspend_state *dss, int
rc);
-static void remus_devices_commit_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc);
-static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
- const struct timeval *requested_abs);
-
-static void libxl__remus_domain_checkpoint_callback(void *data)
-{
- libxl__save_helper_state *shs = data;
- libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
- libxl__egc *egc = dss->shs.egc;
- STATE_AO_GC(dss->ao);
-
- /* This would go into tailbuf. */
- if (dss->hvm) {
- libxl__domain_save_device_model(egc, dss, remus_checkpoint_dm_saved);
- } else {
- remus_checkpoint_dm_saved(egc, dss, 0);
- }
-}
-
-static void remus_checkpoint_dm_saved(libxl__egc *egc,
- libxl__domain_suspend_state *dss, int rc)
-{
- /* Convenience aliases */
- libxl__remus_devices_state *const rds = &dss->rds;
-
- STATE_AO_GC(dss->ao);
-
- if (rc) {
- LOG(ERROR, "Failed to save device model. Terminating Remus..");
- goto out;
- }
-
- rds->callback = remus_devices_commit_cb;
- libxl__remus_devices_commit(egc, rds);
-
- return;
-
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
-}
-
-static void remus_devices_commit_cb(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc)
-{
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
-
- STATE_AO_GC(dss->ao);
-
- if (rc) {
- LOG(ERROR, "Failed to do device commit op."
- " Terminating Remus..");
- goto out;
- }
-
- /*
- * At this point, we have successfully checkpointed the guest and
- * committed it at the backup. We'll come back after the checkpoint
- * interval to checkpoint the guest again. Until then, let the guest
- * continue execution.
- */
-
- /* Set checkpoint interval timeout */
- rc = libxl__ev_time_register_rel(gc, &dss->checkpoint_timeout,
- remus_next_checkpoint,
- dss->interval);
-
- if (rc)
- goto out;
-
- return;
-
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
-}
-
-static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
- const struct timeval *requested_abs)
-{
- libxl__domain_suspend_state *dss =
- CONTAINER_OF(ev, *dss, checkpoint_timeout);
-
- STATE_AO_GC(dss->ao);
-
- /*
- * Time to checkpoint the guest again. We return 1 to libxc
- * (xc_domain_save.c). in order to continue executing the infinite loop
- * (suspend, checkpoint, resume) in xc_domain_save().
- */
- libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 1);
-}
-
/*----- main code for suspending, in order of execution -----*/
void libxl__domain_suspend2(libxl__egc *egc,
libxl__domain_suspend_state2 *dss2)
@@ -2222,10 +2035,6 @@ static void save_device_model_datacopier_done(libxl__egc
*egc,
dss->save_dm_callback(egc, dss, our_rc);
}
-static void remus_teardown_done(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc);
-
static void domain_suspend_done(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc)
{
@@ -2241,34 +2050,11 @@ static void domain_suspend_done(libxl__egc *egc,
xc_suspend_evtchn_release(CTX->xch, CTX->xce, domid,
dss2->guest_evtchn.port,
&dss2->guest_evtchn_lockfd);
- if (!dss->remus) {
- dss->callback(egc, dss, rc);
+ if (dss->remus) {
+ libxl__remus_teardown(egc, dss, rc);
return;
}
- /*
- * With Remus, if we reach this point, it means either
- * backup died or some network error occurred preventing us
- * from sending checkpoints. Teardown the network buffers and
- * release netlink resources. This is an async op.
- */
- LOG(WARN, "Remus: Domain suspend terminated with rc %d,"
- " teardown Remus devices...", rc);
- dss->rds.callback = remus_teardown_done;
- libxl__remus_devices_teardown(egc, &dss->rds);
-}
-
-static void remus_teardown_done(libxl__egc *egc,
- libxl__remus_devices_state *rds,
- int rc)
-{
- libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
- STATE_AO_GC(dss->ao);
-
- if (rc)
- LOG(ERROR, "Remus: failed to teardown device for guest with domid %u,"
- " rc %d", dss->domid, rc);
-
dss->callback(egc, dss, rc);
}
diff --git a/tools/libxl/libxl_remus.c b/tools/libxl/libxl_remus.c
new file mode 100644
index 0000000..b555715
--- /dev/null
+++ b/tools/libxl/libxl_remus.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) 2014 FUJITSU LIMITED
+ * Author Wen Congyang <wency@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+
+#include "libxl_internal.h"
+#include "libxl_remus.h"
+
+
+/*----- remus: setup the environment -----*/
+static void libxl__remus_setup_done(libxl__egc *egc,
+ libxl__remus_devices_state *rds, int rc);
+static void libxl__remus_setup_failed(libxl__egc *egc,
+ libxl__remus_devices_state *rds, int rc);
+
+void libxl__remus_setup(libxl__egc *egc,
+ libxl__domain_suspend_state *dss)
+{
+ /* Convenience aliases */
+ libxl__remus_devices_state *const rds = &dss->rds;
+ const libxl_domain_remus_info *const info = dss->remus;
+
+ STATE_AO_GC(dss->ao);
+
+ if (libxl_defbool_val(info->netbuf)) {
+ if (!libxl__netbuffer_enabled(gc)) {
+ LOG(ERROR, "Remus: No support for network buffering");
+ goto out;
+ }
+ rds->device_kind_flags |= (1 << LIBXL__DEVICE_KIND_VIF);
+ }
+
+ if (libxl_defbool_val(info->diskbuf))
+ rds->device_kind_flags |= (1 << LIBXL__DEVICE_KIND_VBD);
+
+ rds->ao = ao;
+ rds->domid = dss->domid;
+ rds->callback = libxl__remus_setup_done;
+
+ libxl__remus_devices_setup(egc, rds);
+ return;
+
+out:
+ libxl__remus_setup_failed(egc, rds, ERROR_FAIL);
+}
+
+static void libxl__remus_setup_done(libxl__egc *egc,
+ libxl__remus_devices_state *rds, int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (!rc) {
+ libxl__domain_suspend(egc, dss);
+ return;
+ }
+
+ LOG(ERROR, "Remus: failed to setup device for guest with domid %u, rc %d",
+ dss->domid, rc);
+ rds->callback = libxl__remus_setup_failed;
+ libxl__remus_devices_teardown(egc, rds);
+}
+
+static void libxl__remus_setup_failed(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (rc)
+ LOG(ERROR, "Remus: failed to teardown device after setup failed"
+ " for guest with domid %u, rc %d", dss->domid, rc);
+
+ dss->callback(egc, dss, rc);
+}
+
+
+/*----- remus: teardown the environment -----*/
+static void remus_teardown_done(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc);
+
+void libxl__remus_teardown(libxl__egc *egc,
+ libxl__domain_suspend_state *dss,
+ int rc)
+{
+ EGC_GC;
+
+ /*
+ * If we reach this point, it means either backup died or some
+ * network error occurred preventing us from sending checkpoints.
+ * Teardown the network buffers and release netlink resources.
+ * This is an async op.
+ */
+ LOG(WARN, "Remus: Domain suspend terminated with rc %d,"
+ " teardown Remus devices...", rc);
+ dss->rds.callback = remus_teardown_done;
+ libxl__remus_devices_teardown(egc, &dss->rds);
+}
+
+static void remus_teardown_done(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (rc)
+ LOG(ERROR, "Remus: failed to teardown device for guest with domid %u,"
+ " rc %d", dss->domid, rc);
+
+ dss->callback(egc, dss, rc);
+}
+
+
+/*----- remus: suspend the guest -----*/
+static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
+ libxl__domain_suspend_state2 *dss2, int ok);
+static void remus_devices_postsuspend_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc);
+
+void libxl__remus_domain_suspend_callback(void *data)
+{
+ libxl__save_helper_state *shs = data;
+ libxl__egc *egc = shs->egc;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
+
+ /* Convenience aliases */
+ libxl__domain_suspend_state2 *const dss2 = &dss->dss2;
+
+ dss2->callback_common_done = remus_domain_suspend_callback_common_done;
+ libxl__domain_suspend2(egc, dss2);
+}
+
+static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
+ libxl__domain_suspend_state2 *dss2, int ok)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(dss2, *dss, dss2);
+
+ if (!ok)
+ goto out;
+
+ libxl__remus_devices_state *const rds = &dss->rds;
+ rds->callback = remus_devices_postsuspend_cb;
+ libxl__remus_devices_postsuspend(egc, rds);
+ return;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
+}
+
+static void remus_devices_postsuspend_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc)
+{
+ int ok = 0;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+
+ if (rc)
+ goto out;
+
+ ok = 1;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
+}
+
+
+/*----- remus: resume the guest -----*/
+static void remus_devices_preresume_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc);
+
+void libxl__remus_domain_resume_callback(void *data)
+{
+ libxl__save_helper_state *shs = data;
+ libxl__egc *egc = shs->egc;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
+ STATE_AO_GC(dss->ao);
+
+ libxl__remus_devices_state *const rds = &dss->rds;
+ rds->callback = remus_devices_preresume_cb;
+ libxl__remus_devices_preresume(egc, rds);
+}
+
+static void remus_devices_preresume_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc)
+{
+ int ok = 0;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (rc)
+ goto out;
+
+ /* Resumes the domain and the device model */
+ rc = libxl__domain_resume(gc, dss->domid, /* Fast Suspend */1);
+ if (rc)
+ goto out;
+
+ ok = 1;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
+}
+
+
+/*----- remus: wait a new checkpoint -----*/
+static void remus_checkpoint_dm_saved(libxl__egc *egc,
+ libxl__domain_suspend_state *dss, int
rc);
+static void remus_devices_commit_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc);
+static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
+ const struct timeval *requested_abs);
+
+void libxl__remus_domain_checkpoint_callback(void *data)
+{
+ libxl__save_helper_state *shs = data;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
+ libxl__egc *egc = dss->shs.egc;
+ STATE_AO_GC(dss->ao);
+
+ /* This would go into tailbuf. */
+ if (dss->hvm) {
+ libxl__domain_save_device_model(egc, dss, remus_checkpoint_dm_saved);
+ } else {
+ remus_checkpoint_dm_saved(egc, dss, 0);
+ }
+}
+
+static void remus_checkpoint_dm_saved(libxl__egc *egc,
+ libxl__domain_suspend_state *dss, int rc)
+{
+ /* Convenience aliases */
+ libxl__remus_devices_state *const rds = &dss->rds;
+
+ STATE_AO_GC(dss->ao);
+
+ if (rc) {
+ LOG(ERROR, "Failed to save device model. Terminating Remus..");
+ goto out;
+ }
+
+ rds->callback = remus_devices_commit_cb;
+ libxl__remus_devices_commit(egc, rds);
+
+ return;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
+}
+
+static void remus_devices_commit_cb(libxl__egc *egc,
+ libxl__remus_devices_state *rds,
+ int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+
+ STATE_AO_GC(dss->ao);
+
+ if (rc) {
+ LOG(ERROR, "Failed to do device commit op."
+ " Terminating Remus..");
+ goto out;
+ }
+
+ /*
+ * At this point, we have successfully checkpointed the guest and
+ * committed it at the backup. We'll come back after the checkpoint
+ * interval to checkpoint the guest again. Until then, let the guest
+ * continue execution.
+ */
+
+ /* Set checkpoint interval timeout */
+ rc = libxl__ev_time_register_rel(gc, &dss->checkpoint_timeout,
+ remus_next_checkpoint,
+ dss->interval);
+
+ if (rc)
+ goto out;
+
+ return;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
+}
+
+static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
+ const struct timeval *requested_abs)
+{
+ libxl__domain_suspend_state *dss =
+ CONTAINER_OF(ev, *dss, checkpoint_timeout);
+
+ STATE_AO_GC(dss->ao);
+
+ /*
+ * Time to checkpoint the guest again. We return 1 to libxc
+ * (xc_domain_save.c). in order to continue executing the infinite loop
+ * (suspend, checkpoint, resume) in xc_domain_save().
+ */
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 1);
+}
diff --git a/tools/libxl/libxl_remus.h b/tools/libxl/libxl_remus.h
new file mode 100644
index 0000000..53e5e81
--- /dev/null
+++ b/tools/libxl/libxl_remus.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2014 FUJITSU LIMITED
+ * Author Wen Congyang <wency@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#ifndef LIBXL_REMUS_H
+#define LIBXL_REMUS_H
+
+void libxl__remus_setup(libxl__egc *egc,
+ libxl__domain_suspend_state *dss);
+void libxl__remus_teardown(libxl__egc *egc,
+ libxl__domain_suspend_state *dss,
+ int rc);
+void libxl__remus_domain_suspend_callback(void *data);
+void libxl__remus_domain_resume_callback(void *data);
+void libxl__remus_domain_checkpoint_callback(void *data);
+
+#endif
--
1.9.1
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