qapi: make s390x specific CPU commands unconditionally available

This removes the TARGET_S390X and CONFIG_KVM conditions from the
CPU commands that are conceptually specific to s390x. Top level
stubs are provided to cope with non-s390x targets, or builds
without KVM.

The removal of CONFIG_KVM is justified by the fact there is no
conceptual difference between running 'qemu-system-s390x -accel tcg'
on a build with and without KVM built-in, so apps only using TCG
can't rely on the CONFIG_KVM in the schema.

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: <20250522190542.588267-11-pierrick.bouvier@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

hw/s390x/cpu-topology.c

@@ -23,8 +23,8 @@
 #include "target/s390x/cpu.h"
 #include "hw/s390x/s390-virtio-ccw.h"
 #include "hw/s390x/cpu-topology.h"
-#include "qapi/qapi-commands-machine-target.h"
+#include "qapi/qapi-commands-machine-s390x.h"
-#include "qapi/qapi-events-machine-target.h"
+#include "qapi/qapi-events-machine-s390x.h"
 
 /*
  * s390_topology is used to keep the topology information.

include/hw/s390x/cpu-topology.h

@@ -13,7 +13,7 @@
 
 #include "qemu/queue.h"
 #include "hw/boards.h"
-#include "qapi/qapi-types-machine-target.h"
+#include "qapi/qapi-types-machine-s390x.h"
 
 #define S390_TOPOLOGY_CPU_IFL   0x03
 

qapi/machine-s390x.json

@@ -1,6 +1,7 @@
 # -*- Mode: Python -*-
 # vim: filetype=python
 #
+# SPDX-License-Identifier: GPL-2.0-or-later
 # This work is licensed under the terms of the GNU GPL, version 2 or later.
 # See the COPYING file in the top-level directory.
 
@@ -15,8 +16,7 @@
 # Since: 8.2
 ##
 { 'enum': 'S390CpuPolarization',
-  'data': [ 'horizontal', 'vertical' ],
+  'data': [ 'horizontal', 'vertical' ]
-  'if': 'TARGET_S390X'
 }
 
 ##
@@ -54,8 +54,7 @@
       '*entitlement': 'S390CpuEntitlement',
       '*dedicated': 'bool'
   },
-  'features': [ 'unstable' ],
+  'features': [ 'unstable' ]
-  'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
 }
 
 ##
@@ -90,8 +89,7 @@
 ##
 { 'event': 'CPU_POLARIZATION_CHANGE',
   'data': { 'polarization': 'S390CpuPolarization' },
-  'features': [ 'unstable' ],
+  'features': [ 'unstable' ]
-  'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
 }
 
 ##
@@ -104,8 +102,7 @@
 # Since: 8.2
 ##
 { 'struct': 'CpuPolarizationInfo',
-  'data': { 'polarization': 'S390CpuPolarization' },
+  'data': { 'polarization': 'S390CpuPolarization' }
-  'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
 }
 
 ##
@@ -120,6 +117,5 @@
 # Since: 8.2
 ##
 { 'command': 'query-s390x-cpu-polarization', 'returns': 'CpuPolarizationInfo',
-  'features': [ 'unstable' ],
+  'features': [ 'unstable' ]
-  'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
 }

qapi/meson.build

@@ -39,7 +39,7 @@ qapi_all_modules = [
   'job',
   'machine-common',
   'machine',
-  'machine-target',
+  'machine-s390x',
   'migration',
   'misc',
   'net',

qapi/qapi-schema.json

@@ -57,7 +57,7 @@
 { 'include': 'qdev.json' }
 { 'include': 'machine-common.json' }
 { 'include': 'machine.json' }
-{ 'include': 'machine-target.json' }
+{ 'include': 'machine-s390x.json' }
 { 'include': 'replay.json' }
 { 'include': 'yank.json' }
 { 'include': 'misc.json' }

stubs/meson.build

@@ -84,6 +84,7 @@ if have_system
   stub_ss.add(files('monitor-i386-xen.c'))
   stub_ss.add(files('monitor-cpu.c'))
   stub_ss.add(files('monitor-cpu-s390x.c'))
+  stub_ss.add(files('monitor-cpu-s390x-kvm.c'))
 endif
 
 if have_system or have_user

stubs/monitor-cpu-s390x-kvm.c

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-machine-s390x.h"
+
+void qmp_set_cpu_topology(uint16_t core,
+                          bool has_socket, uint16_t socket,
+                          bool has_book, uint16_t book,
+                          bool has_drawer, uint16_t drawer,
+                          bool has_entitlement, S390CpuEntitlement entitlement,
+                          bool has_dedicated, bool dedicated,
+                          Error **errp)
+{
+    error_setg(errp, "CPU topology change is not supported on this target");
+}
+
+CpuPolarizationInfo *qmp_query_s390x_cpu_polarization(Error **errp)
+{
+    error_setg(errp, "CPU polarization is not supported on this target");
+    return NULL;
+}

tests/qtest/qmp-cmd-test.c

@@ -100,6 +100,7 @@ static bool query_is_ignored(const char *cmd)
         /* Success depends on target arch: */
         "query-cpu-definitions",  /* arm, i386, ppc, s390x */
         "query-gic-capabilities", /* arm */
+        "query-s390x-cpu-polarization", /* s390x */
         /* Success depends on target-specific build configuration: */
         "query-pci",              /* CONFIG_PCI */
         "x-query-virtio",         /* CONFIG_VIRTIO */