[V6,07/27] cpr: reboot HMP interfaces

Commit Message

Steven Sistare Aug. 6, 2021, 9:43 p.m. UTC

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

cpr-load <filename>
  Call qmp_cpr_load().
  Arguments:
    filename : load vmstate from filename

Signed-off-by: Mark Kanda <[e-mail]>
Signed-off-by: Steve Sistare <[e-mail]>
---
 hmp-commands.hx       | 31 +++++++++++++++++++++++++++++++
 include/monitor/hmp.h |  2 ++
 monitor/hmp-cmds.c    | 28 ++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

Patch

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 8e45bce..0a45c59 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -351,6 +351,37 @@  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,
+create a checkpoint of the whole virtual machine, and save it in *filename*.
+If *mode* is 'reboot', the checkpoint remains valid after a host kexec
+reboot, and guest ram must be backed by persistent shared memory.  To
+resume from the checkpoint, issue the quit command, reboot the system,
+and issue the cpr-load command.
+ERST
+
+    {
+        .name       = "cpr-load",
+        .args_type  = "filename:s",
+        .params     = "filename",
+        .help       = "load VM checkpoint from file",
+        .cmd        = hmp_cpr_load,
+    },
+
+SRST
+``cpr-load`` *filename*
+Load a virtual machine from checkpoint file *filename* and continue VCPUs.
+ERST
+
+    {
         .name       = "delvm",
         .args_type  = "name:s",
         .params     = "tag",
diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
index 3baa105..01b5df8 100644
--- a/include/monitor/hmp.h
+++ b/include/monitor/hmp.h
@@ -58,6 +58,8 @@  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 e00255f..6aed6ac 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"
@@ -1177,6 +1178,33 @@  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 *mode;
+    int val;
+
+    mode = qdict_get_try_str(qdict, "mode");
+    val = qapi_enum_parse(&CprMode_lookup, mode, -1, &err);
+
+    if (val == -1) {
+        goto out;
+    }
+
+    qmp_cpr_save(qdict_get_try_str(qdict, "filename"), val, &err);
+
+out:
+    hmp_handle_error(mon, err);
+}
+
+void hmp_cpr_load(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+
+    qmp_cpr_load(qdict_get_try_str(qdict, "filename"), &err);
+    hmp_handle_error(mon, err);
+}
+
 void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
 {
     qmp_migrate_cancel(NULL);