[RFC PATCH v2 02/16] qapi: Implement query-machine-phase QMP command

[Damien Hedde <damien.hedde@xxxxxxxxxxxxx>]

From: Mirela Grujic <mirela.grujic@xxxxxxxxxxxxx>

The command returns current machine initialization phase.
>From now on, the MachineInitPhase enum is generated from the
QAPI schema.

Signed-off-by: Mirela Grujic <mirela.grujic@xxxxxxxxxxxxx>
---
 qapi/machine.json          | 56 ++++++++++++++++++++++++++++++++++++++
 include/hw/qdev-core.h     | 30 ++------------------
 hw/core/machine-qmp-cmds.c |  9 ++++++
 hw/core/qdev.c             |  5 ++++
 4 files changed, 72 insertions(+), 28 deletions(-)

diff --git a/qapi/machine.json b/qapi/machine.json
index 157712f006..969d37fb03 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1312,3 +1312,59 @@
      '*cores': 'int',
      '*threads': 'int',
      '*maxcpus': 'int' } }
+
+##
+# @MachineInitPhase:
+#
+# Enumeration of machine initialization phases.
+#
+# @no-machine: machine does not exist
+#
+# @machine-created: machine is created, but its accelerator is not
+#
+# @accel-created: accelerator is created, but the machine properties have not
+#                 been validated and machine initialization is not done yet
+#
+# @initialized: machine is initialized, thus creating any embedded devices and
+#               validating machine properties. Devices created at this time are
+#               considered to be cold-plugged.
+#
+# @ready: QEMU is ready to start CPUs and devices created at this time are
+#         considered to be hot-plugged. The monitor is not restricted to
+#         "preconfig" commands.
+#
+# Since: 6.2
+##
+{ 'enum': 'MachineInitPhase',
+  'data': [ 'no-machine', 'machine-created', 'accel-created', 'initialized',
+            'ready' ] }
+
+##
+# @MachineInitPhaseStatus:
+#
+# Information about machine initialization phase
+#
+# @phase: the machine initialization phase
+#
+# Since: 6.2
+##
+{ 'struct': 'MachineInitPhaseStatus',
+  'data': { 'phase': 'MachineInitPhase' } }
+
+##
+# @query-machine-phase:
+#
+# Return machine initialization phase
+#
+# Since: 6.2
+#
+# Returns: MachineInitPhaseStatus
+#
+# Example:
+#
+# -> { "execute": "query-machine-phase" }
+# <- { "return": { "phase": "initialized" } }
+#
+##
+{ 'command': 'query-machine-phase', 'returns': 'MachineInitPhaseStatus',
+             'allow-preconfig': true }
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 859fd913bb..800eda8f54 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -1,6 +1,7 @@
 #ifndef QDEV_CORE_H
 #define QDEV_CORE_H
 
+#include "qapi/qapi-types-machine.h"
 #include "qemu/queue.h"
 #include "qemu/bitmap.h"
 #include "qemu/rcu.h"
@@ -839,35 +840,8 @@ void device_listener_unregister(DeviceListener *listener);
  */
 bool qdev_should_hide_device(QemuOpts *opts);
 
-typedef enum MachineInitPhase {
-    /* current_machine is NULL.  */
-    MACHINE_INIT_PHASE_NO_MACHINE,
-
-    /* current_machine is not NULL, but current_machine->accel is NULL.  */
-    MACHINE_INIT_PHASE_MACHINE_CREATED,
-
-    /*
-     * current_machine->accel is not NULL, but the machine properties have
-     * not been validated and machine_class->init has not yet been called.
-     */
-    MACHINE_INIT_PHASE_ACCEL_CREATED,
-
-    /*
-     * machine_class->init has been called, thus creating any embedded
-     * devices and validating machine properties.  Devices created at
-     * this time are considered to be cold-plugged.
-     */
-    MACHINE_INIT_PHASE_INITIALIZED,
-
-    /*
-     * QEMU is ready to start CPUs and devices created at this time
-     * are considered to be hot-plugged.  The monitor is not restricted
-     * to "preconfig" commands.
-     */
-    MACHINE_INIT_PHASE_READY,
-} MachineInitPhase;
-
 extern bool phase_check(MachineInitPhase phase);
 extern void phase_advance(MachineInitPhase phase);
+extern MachineInitPhase phase_get(void);
 
 #endif
diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index 52168a3771..d3b9a04855 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -204,3 +204,12 @@ MemdevList *qmp_query_memdev(Error **errp)
     object_child_foreach(obj, query_memdev, &list);
     return list;
 }
+
+MachineInitPhaseStatus *qmp_query_machine_phase(Error **errp)
+{
+    MachineInitPhaseStatus *status = g_malloc0(sizeof(*status));
+
+    status->phase = phase_get();
+
+    return status;
+}
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index c5fc704f55..d83f1c029a 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -1150,6 +1150,11 @@ void phase_advance(MachineInitPhase phase)
     machine_phase = phase;
 }
 
+MachineInitPhase phase_get(void)
+{
+    return machine_phase;
+}
+
 static const TypeInfo device_type_info = {
     .name = TYPE_DEVICE,
     .parent = TYPE_OBJECT,
-- 
2.33.0