hmp: add exit_preconfig

Add the exit_preconfig command to return to normality.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20180620153947.30834-7-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

hmp-commands.hx

@@ -55,6 +55,25 @@ STEXI
 @item q or quit
 @findex quit
 Quit the emulator.
+ETEXI
+
+    {
+        .name       = "exit_preconfig",
+        .args_type  = "",
+        .params     = "",
+        .help       = "exit the preconfig state",
+        .cmd        = hmp_exit_preconfig,
+        .flags      = "p",
+    },
+
+STEXI
+@item exit_preconfig
+@findex exit_preconfig
+This command makes QEMU exit the preconfig state and proceed with
+VM initialization using configuration data provided on the command line
+and via the QMP monitor during the preconfig state. The command is only
+available during the preconfig state (i.e. when the --preconfig command
+line option was in use).
 ETEXI
 
     {

hmp.c

@@ -1068,6 +1068,14 @@ void hmp_system_powerdown(Monitor *mon, const QDict *qdict)
     qmp_system_powerdown(NULL);
 }
 
+void hmp_exit_preconfig(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+
+    qmp_exit_preconfig(&err);
+    hmp_handle_error(mon, &err);
+}
+
 void hmp_cpu(Monitor *mon, const QDict *qdict)
 {
     int64_t cpu_index;

hmp.h

@@ -44,6 +44,7 @@ void hmp_quit(Monitor *mon, const QDict *qdict);
 void hmp_stop(Monitor *mon, const QDict *qdict);
 void hmp_system_reset(Monitor *mon, const QDict *qdict);
 void hmp_system_powerdown(Monitor *mon, const QDict *qdict);
+void hmp_exit_preconfig(Monitor *mon, const QDict *qdict);
 void hmp_cpu(Monitor *mon, const QDict *qdict);
 void hmp_memsave(Monitor *mon, const QDict *qdict);
 void hmp_pmemsave(Monitor *mon, const QDict *qdict);