[RFC PATCH v2 03/16] qapi: Implement x-machine-init QMP command

[Damien Hedde <damien.hedde@greensocs.com>]

From: Mirela Grujic <mirela.grujic@greensocs.com>

The x-machine-init QMP command is available only if the -preconfig option
is used and the current machine initialization phase is accel-created.

The command triggers QEMU to enter machine initialized phase and wait
for the QMP configuration. In future commits, we will add the possiblity
to create devices at this point.

To exit the initialized phase use the x-exit-preconfig QMP command.

Signed-off-by: Mirela Grujic <mirela.grujic@greensocs.com>
---
 qapi/machine.json | 23 +++++++++++++++++++++++
 softmmu/vl.c      | 19 +++++++++++++++----
 2 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/qapi/machine.json b/qapi/machine.json
index 969d37fb03..56330c0e8e 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1368,3 +1368,26 @@
 ##
 { 'command': 'query-machine-phase', 'returns': 'MachineInitPhaseStatus',
              'allow-preconfig': true }
+
+##
+# @x-machine-init:
+#
+# Enter machine initialized phase
+#
+# Since: 6.2
+#
+# Returns: If successful, nothing
+#
+# Notes: This command will trigger QEMU to execute initialization steps
+#        that are required to enter the machine initialized phase. The command
+#        is available only if the -preconfig command line option was passed and
+#        if the machine is currently in the accel-created phase. To exit the
+#        machine initialized phase use the x-exit-preconfig command.
+#
+# Example:
+#
+# -> { "execute": "x-machine-init" }
+# <- { "return": {} }
+#
+##
+{ 'command': 'x-machine-init', 'allow-preconfig': true }
diff --git a/softmmu/vl.c b/softmmu/vl.c
index d2552ba8ac..84c5132ad7 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -123,6 +123,7 @@
 #include "qapi/qapi-visit-qom.h"
 #include "qapi/qapi-commands-ui.h"
 #include "qapi/qmp/qdict.h"
+#include "qapi/qapi-commands-machine.h"
 #include "qapi/qmp/qerror.h"
 #include "sysemu/iothread.h"
 #include "qemu/guest-random.h"
@@ -2610,10 +2611,16 @@ static void qemu_init_displays(void)
     }
 }
 
-static void qemu_init_board(void)
+void qmp_x_machine_init(Error **errp)
 {
     MachineClass *machine_class = MACHINE_GET_CLASS(current_machine);
 
+    if (phase_check(MACHINE_INIT_PHASE_INITIALIZED)) {
+        error_setg(errp, "The command is permitted only before "
+                         "the machine is initialized");
+        return;
+    }
+
     if (machine_class->default_ram_id && current_machine->ram_size &&
         numa_uses_legacy_mem() && !current_machine->ram_memdev_id) {
         create_default_memdev(current_machine, mem_path);
@@ -2692,12 +2699,16 @@ static void qemu_machine_creation_done(void)
 
 void qmp_x_exit_preconfig(Error **errp)
 {
-    if (phase_check(MACHINE_INIT_PHASE_INITIALIZED)) {
-        error_setg(errp, "The command is permitted only before machine initialization");
+    if (phase_check(MACHINE_INIT_PHASE_READY)) {
+        error_setg(errp, "The command is permitted only before "
+                         "the machine is ready");
         return;
     }
 
-    qemu_init_board();
+    if (!phase_check(MACHINE_INIT_PHASE_INITIALIZED)) {
+        qmp_x_machine_init(errp);
+    }
+
     qemu_create_cli_devices();
     qemu_machine_creation_done();
 
-- 
2.33.0