[V4,04/25] cpr: HMP interfaces for reboot

Commit Message

Steven Sistare July 6, 2021, 4:45 p.m. UTC

cprsave <file> <mode>
  Call cprsave().
  Arguments:
    file : save vmstate to this file name
    mode: must be "reboot"

cprload <file>
  Call cprload().
  Arguments:
    file : load vmstate from this file name

cprinfo
  Print to stdout a space-delimited list of modes supported by cprsave.
  Arguments: none

Signed-off-by: Mark Kanda <[e-mail]>
Signed-off-by: Steve Sistare <[e-mail]>
---
 hmp-commands.hx       | 44 ++++++++++++++++++++++++++++++++++++++++++++
 include/monitor/hmp.h |  3 +++
 monitor/hmp-cmds.c    | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 95 insertions(+)

Patch

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 435c591..015faae 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -351,6 +351,50 @@  SRST
 ERST
 
     {
+        .name       = "cprinfo",
+        .args_type  = "",
+        .params     = "",
+        .help       = "return list of modes supported by cprsave",
+        .cmd        = hmp_cprinfo,
+    },
+
+SRST
+``cprinfo``
+Return a space-delimited list of modes supported by cprsave.
+ERST
+
+    {
+        .name       = "cprsave",
+        .args_type  = "file:s,mode:s",
+        .params     = "file 'reboot'",
+        .help       = "create a checkpoint of the VM in file",
+        .cmd        = hmp_cprsave,
+    },
+
+SRST
+``cprsave`` *file* *mode*
+Pause the VCPUs,
+create a checkpoint of the whole virtual machine, and save it in *file*.
+If *mode* is 'reboot', the checkpoint remains valid after a host kexec
+reboot, and guest ram must be backed by persistant shared memory.  To
+resume from the checkpoint, issue the quit command, reboot the system,
+and issue the cprload command.
+ERST
+
+    {
+        .name       = "cprload",
+        .args_type  = "file:s",
+        .params     = "file",
+        .help       = "load VM checkpoint from file",
+        .cmd        = hmp_cprload,
+    },
+
+SRST
+``cprload`` *file*
+Load a virtual machine from checkpoint file *file* 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 605d572..e4ebdf1 100644
--- a/include/monitor/hmp.h
+++ b/include/monitor/hmp.h
@@ -58,6 +58,9 @@  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_cprinfo(Monitor *mon, const QDict *qdict);
+void hmp_cprsave(Monitor *mon, const QDict *qdict);
+void hmp_cprload(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 0ad5b77..e115a23 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"
@@ -1173,6 +1174,53 @@  void hmp_announce_self(Monitor *mon, const QDict *qdict)
     qapi_free_AnnounceParameters(params);
 }
 
+void hmp_cprinfo(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+    CprInfo *cprinfo;
+    CprModeList *mode;
+
+    cprinfo = qmp_cprinfo(&err);
+    if (err) {
+        goto out;
+    }
+
+    for (mode = cprinfo->modes; mode; mode = mode->next) {
+        monitor_printf(mon, "%s ", CprMode_str(mode->value));
+    }
+
+out:
+    hmp_handle_error(mon, err);
+    qapi_free_CprInfo(cprinfo);
+}
+
+void hmp_cprsave(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_cprsave(qdict_get_try_str(qdict, "file"), val, &err);
+
+out:
+    hmp_handle_error(mon, err);
+}
+
+void hmp_cprload(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+
+    qmp_cprload(qdict_get_try_str(qdict, "file"), &err);
+    hmp_handle_error(mon, err);
+}
+
 void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
 {
     qmp_migrate_cancel(NULL);