[PATCH V8 07/39] cpr: reboot HMP interfaces

[Steve Sistare]

cpr-save <filename> <mode>
  Call qmp_cpr_save().
  Arguments:
    filename : save vmstate to filename
    mode: must be "reboot"

cpr-load <filename> <mode>
  Call qmp_cpr_load().
  Arguments:
    filename : load vmstate from filename
    mode: must be "reboot"

Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hmp-commands.hx       | 39 +++++++++++++++++++++++++++++++++++++++
 include/monitor/hmp.h |  2 ++
 monitor/hmp-cmds.c    | 27 +++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 564f1de..9d9f984 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -355,6 +355,45 @@ SRST
 ERST
 
     {
+        .name       = "cpr-save",
+        .args_type  = "filename:s,mode:s",
+        .params     = "filename 'reboot'",
+        .help       = "create a checkpoint of the VM in file",
+        .cmd        = hmp_cpr_save,
+    },
+
+SRST
+``cpr-save`` *filename* *mode*
+  Pause the VCPUs, and create a checkpoint of the virtual machine device state
+  in *filename*.  Unlike snapshot-save, this command completes synchronously,
+  saves state to an ordinary file, does not save guest block device blocks,
+  and does not require that guest RAM be saved in the file.  The caller must
+  not modify guest block devices between cpr-save and cpr-load.
+
+  If *mode* is 'reboot', the checkpoint remains valid after a host reboot.
+  The guest RAM memory-backend should be shared and non-volatile across
+  reboot, else it will be saved to the file.  To resume from the checkpoint,
+  issue the quit command, reboot the system, start qemu using the same
+  arguments plus -S, and issue the cpr-load command.
+ERST
+
+    {
+        .name       = "cpr-load",
+        .args_type  = "filename:s,mode:s",
+        .params     = "filename 'reboot'",
+
+        .help       = "load VM checkpoint from file",
+        .cmd        = hmp_cpr_load,
+    },
+
+SRST
+``cpr-load`` *filename* *mode*
+  Load a virtual machine from the checkpoint file *filename* that was created
+  earlier by the cpr-save command, and continue the VCPUs.  *mode* must match
+  the mode specified for cpr-save.
+ERST
+
+    {
         .name       = "delvm",
         .args_type  = "name:s",
         .params     = "tag",
diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
index 96d0148..b44588e 100644
--- a/include/monitor/hmp.h
+++ b/include/monitor/hmp.h
@@ -59,6 +59,8 @@ void hmp_balloon(Monitor *mon, const QDict *qdict);
 void hmp_loadvm(Monitor *mon, const QDict *qdict);
 void hmp_savevm(Monitor *mon, const QDict *qdict);
 void hmp_delvm(Monitor *mon, const QDict *qdict);
+void hmp_cpr_save(Monitor *mon, const QDict *qdict);
+void hmp_cpr_load(Monitor *mon, const QDict *qdict);
 void hmp_migrate_cancel(Monitor *mon, const QDict *qdict);
 void hmp_migrate_continue(Monitor *mon, const QDict *qdict);
 void hmp_migrate_incoming(Monitor *mon, const QDict *qdict);
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 622c783..bb12589 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -33,6 +33,7 @@
 #include "qapi/qapi-commands-block.h"
 #include "qapi/qapi-commands-char.h"
 #include "qapi/qapi-commands-control.h"
+#include "qapi/qapi-commands-cpr.h"
 #include "qapi/qapi-commands-machine.h"
 #include "qapi/qapi-commands-migration.h"
 #include "qapi/qapi-commands-misc.h"
@@ -1122,6 +1123,32 @@ void hmp_announce_self(Monitor *mon, const QDict *qdict)
     qapi_free_AnnounceParameters(params);
 }
 
+void hmp_cpr_save(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+    const char *filename = qdict_get_try_str(qdict, "filename");
+    const char *str = qdict_get_try_str(qdict, "mode");
+    CprMode mode = qapi_enum_parse(&CprMode_lookup, str, -1, &err);
+
+    if (mode != -1) {
+        qmp_cpr_save(filename, mode, &err);
+    }
+    hmp_handle_error(mon, err);
+}
+
+void hmp_cpr_load(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+    const char *filename = qdict_get_try_str(qdict, "filename");
+    const char *str = qdict_get_try_str(qdict, "mode");
+    CprMode mode = qapi_enum_parse(&CprMode_lookup, str, -1, &err);
+
+    if (mode != -1) {
+        qmp_cpr_load(filename, mode, &err);
+    }
+    hmp_handle_error(mon, err);
+}
+
 void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
 {
     qmp_migrate_cancel(NULL);
-- 
1.8.3.1