monitor: Do not check TARGET_S390X to build s390x commands

These commands are filtered at build-time for s390x binary.
By using the recently introduced HMPCommand::arch_bitmask flag
we can filter them at runtime, making it possible to compile
hmp-commands[-info].hx files once.

Since the methods are used inconditionally within hw/s390x/,
define them in the same stub file.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20260427080738.77138-14-philmd@linaro.org>

MAINTAINERS

@@ -122,6 +122,7 @@ F: include/hw/watchdog/wdt_diag288.h
 F: pc-bios/s390-ccw/
 F: pc-bios/s390-ccw.img
 F: stubs/qmp-cpu-s390x.c
+F: stubs/hmp-cmds-hw-s390x.c
 F: target/s390x/
 F: docs/system/target-s390x.rst
 F: docs/system/s390x/

hmp-commands-info.hx

@@ -710,30 +710,28 @@ SRST
     Show rocker OF-DPA groups.
 ERST
 
-#if defined(TARGET_S390X)
     {
         .name       = "skeys",
         .args_type  = "addr:l",
         .params     = "address",
         .help       = "Display the value of a storage key",
         .cmd        = hmp_info_skeys,
+        .arch_bitmask = QEMU_ARCH_S390X,
     },
-#endif
 
 SRST
   ``info skeys`` *address*
     Display the value of a storage key (s390 only)
 ERST
 
-#if defined(TARGET_S390X)
     {
         .name       = "cmma",
         .args_type  = "addr:l,count:l?",
         .params     = "address [count]",
         .help       = "Display the values of the CMMA storage attributes for a range of pages",
         .cmd        = hmp_info_cmma,
+        .arch_bitmask = QEMU_ARCH_S390X,
     },
-#endif
 
 SRST
   ``info cmma`` *address*

hmp-commands.hx

@@ -1139,30 +1139,28 @@ SRST
 
 ERST
 
-#if defined(TARGET_S390X)
     {
         .name       = "dump-skeys",
         .args_type  = "filename:F",
         .params     = "",
         .help       = "Save guest storage keys into file 'filename'.\n",
         .cmd        = hmp_dump_skeys,
+        .arch_bitmask = QEMU_ARCH_S390X,
     },
-#endif
 
 SRST
 ``dump-skeys`` *filename*
   Save guest storage keys to a file.
 ERST
 
-#if defined(TARGET_S390X)
     {
         .name       = "migration_mode",
         .args_type  = "mode:i",
         .params     = "mode",
         .help       = "Enables or disables migration mode\n",
         .cmd        = hmp_migrationmode,
+        .arch_bitmask = QEMU_ARCH_S390X,
     },
-#endif
 
 SRST
 ``migration_mode`` *mode*

include/monitor/hmp.h

@@ -16,6 +16,13 @@
 
 #include "qemu/readline.h"
 #include "qapi/qapi-types-common.h"
+#include "monitor/monitor.h"
+
+#define HMP_STUB(cmd) \
+    void hmp_##cmd(Monitor *mon, const QDict *qdict) \
+    { \
+        g_assert_not_reached(); \
+    }
 
 bool hmp_handle_error(Monitor *mon, Error *err);
 void hmp_help_cmd(Monitor *mon, const char *name);

monitor/hmp-target.c

@@ -36,11 +36,6 @@
 #include "qapi/qapi-commands-misc.h"
 #include "qapi/qapi-commands-machine.h"
 
-#if defined(TARGET_S390X)
-#include "hw/s390x/storage-keys.h"
-#include "hw/s390x/storage-attributes.h"
-#endif
-
 /* Make devices configuration available for use in hmp-commands*.hx templates */
 #include CONFIG_DEVICES
 

stubs/hmp-cmds-hw-s390x.c

@@ -0,0 +1,15 @@
+/*
+ * Human Monitor hw/s390x stubs
+ *
+ * Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "monitor/hmp.h"
+
+HMP_STUB(dump_skeys)
+HMP_STUB(info_cmma)
+HMP_STUB(info_skeys)
+HMP_STUB(migrationmode)

stubs/meson.build

@@ -87,6 +87,7 @@ if have_system
   stub_ss.add(files('qmp-cpu.c'))
   stub_ss.add(files('qmp-cpu-s390x.c'))
   stub_ss.add(files('qmp-cpu-s390x-kvm.c'))
+  stub_ss.add(files('hmp-cmds-hw-s390x.c'))
 endif
 
 if have_system or have_user