qapi: expose rtc-reset-reinjection command unconditionally

This removes the TARGET_I386 condition from the rtc-reset-reinjection
command. This requires providing a QMP command stub for non-i386 target.
This in turn requires moving the command out of misc-target.json, since
that will trigger symbol poisoning errors when built from target
independent code.

Rather than putting the command into misc.json, it is proposed to create
misc-$TARGET.json files to hold commands whose impl is conceptually
only applicable to a single target. This gives an obvious docs hint to
consumers that the command is only useful in relation a specific target,
while misc.json is for commands applicable to 2 or more targets.

The current impl of qmp_rtc_reset_reinject() is a no-op if the i386
RTC is disabled in Kconfig, or if the running machine type lack any
RTC device.

The stub impl for non-i386 targets retains this no-op behaviour.
However, it is now reporting an Error mentioning this command is not
available for current target.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20250522190542.588267-2-pierrick.bouvier@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

hw/i386/monitor.c

@@ -26,7 +26,7 @@
 #include "monitor/monitor.h"
 #include "qobject/qdict.h"
 #include "qapi/error.h"
-#include "qapi/qapi-commands-misc-target.h"
+#include "qapi/qapi-commands-misc-i386.h"
 #include "hw/i386/x86.h"
 #include "hw/rtc/mc146818rtc.h"
 

qapi/meson.build

@@ -64,6 +64,7 @@ if have_system
     'qdev',
     'pci',
     'rocker',
+    'misc-i386',
     'tpm',
     'uefi',
   ]

qapi/misc-i386.json

@@ -0,0 +1,24 @@
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+##
+# @rtc-reset-reinjection:
+#
+# This command will reset the RTC interrupt reinjection backlog.  Can
+# be used if another mechanism to synchronize guest time is in effect,
+# for example QEMU guest agent's guest-set-time command.
+#
+# Use of this command is only applicable for x86 machines with an RTC,
+# and on other machines will silently return without performing any
+# action.
+#
+# Since: 2.1
+#
+# .. qmp-example::
+#
+#     -> { "execute": "rtc-reset-reinjection" }
+#     <- { "return": {} }
+##
+{ 'command': 'rtc-reset-reinjection' }

qapi/misc-target.json

@@ -2,23 +2,6 @@
 # vim: filetype=python
 #
 
-##
-# @rtc-reset-reinjection:
-#
-# This command will reset the RTC interrupt reinjection backlog.  Can
-# be used if another mechanism to synchronize guest time is in effect,
-# for example QEMU guest agent's guest-set-time command.
-#
-# Since: 2.1
-#
-# .. qmp-example::
-#
-#     -> { "execute": "rtc-reset-reinjection" }
-#     <- { "return": {} }
-##
-{ 'command': 'rtc-reset-reinjection',
-  'if': 'TARGET_I386' }
-
 ##
 # @SevState:
 #

qapi/qapi-schema.json

@@ -61,6 +61,7 @@
 { 'include': 'replay.json' }
 { 'include': 'yank.json' }
 { 'include': 'misc.json' }
+{ 'include': 'misc-i386.json' }
 { 'include': 'misc-target.json' }
 { 'include': 'audio.json' }
 { 'include': 'acpi.json' }

stubs/meson.build

@@ -77,6 +77,7 @@ if have_system
   stub_ss.add(files('target-monitor-defs.c'))
   stub_ss.add(files('win32-kbd-hook.c'))
   stub_ss.add(files('xen-hw-stub.c'))
+  stub_ss.add(files('monitor-i386-rtc.c'))
 endif
 
 if have_system or have_user

stubs/monitor-i386-rtc.c

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-misc-i386.h"
+
+void qmp_rtc_reset_reinjection(Error **errp)
+{
+    error_setg(errp,
+               "RTC interrupt reinjection backlog reset is not available for"
+               "this machine");
+}