[PATCH v3 10/11] target/i386: Restrict X86CPUFeatureWord to X86 targets

[Philippe Mathieu-Daudé]

Only qemu-system-FOO and qemu-storage-daemon provide QMP
monitors, therefore such declarations and definitions are
irrelevant for user-mode emulation.

Restricting the x86-specific commands to machine-target.json
pulls less QAPI-generated code into user-mode.

Add a stub to satisfy linking in user-mode:

  /usr/bin/ld: libqemu-i386-linux-user.fa.p/target_i386_cpu.c.o: in function 
`x86_cpu_get_feature_words':
  target/i386/cpu.c:4643: undefined reference to 
`visit_type_X86CPUFeatureWordInfoList'
  collect2: error: ld returned 1 exit status
  make: *** [Makefile.ninja:1125: qemu-i386] Error 1

Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v3: Reworded + Meson rebase
---
 qapi/machine-target.json   | 45 ++++++++++++++++++++++++++++++++++++++
 qapi/machine.json          | 42 -----------------------------------
 target/i386/cpu.c          |  2 +-
 target/i386/feature-stub.c | 23 +++++++++++++++++++
 target/i386/meson.build    |  1 +
 5 files changed, 70 insertions(+), 43 deletions(-)
 create mode 100644 target/i386/feature-stub.c

diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index 698850cc78..b4d769a53b 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -4,6 +4,51 @@
 # This work is licensed under the terms of the GNU GPL, version 2 or later.
 # See the COPYING file in the top-level directory.
 
+##
+# @X86CPURegister32:
+#
+# A X86 32-bit register
+#
+# Since: 1.5
+##
+{ 'enum': 'X86CPURegister32',
+  'data': [ 'EAX', 'EBX', 'ECX', 'EDX', 'ESP', 'EBP', 'ESI', 'EDI' ],
+  'if': 'defined(TARGET_I386)' }
+
+##
+# @X86CPUFeatureWordInfo:
+#
+# Information about a X86 CPU feature word
+#
+# @cpuid-input-eax: Input EAX value for CPUID instruction for that feature word
+#
+# @cpuid-input-ecx: Input ECX value for CPUID instruction for that
+#                   feature word
+#
+# @cpuid-register: Output register containing the feature bits
+#
+# @features: value of output register, containing the feature bits
+#
+# Since: 1.5
+##
+{ 'struct': 'X86CPUFeatureWordInfo',
+  'data': { 'cpuid-input-eax': 'int',
+            '*cpuid-input-ecx': 'int',
+            'cpuid-register': 'X86CPURegister32',
+            'features': 'int' },
+  'if': 'defined(TARGET_I386)' }
+
+##
+# @DummyForceArrays:
+#
+# Not used by QMP; hack to let us use X86CPUFeatureWordInfoList internally
+#
+# Since: 2.5
+##
+{ 'struct': 'DummyForceArrays',
+  'data': { 'unused': ['X86CPUFeatureWordInfo'] },
+  'if': 'defined(TARGET_I386)' }
+
 ##
 # @CpuModelInfo:
 #
diff --git a/qapi/machine.json b/qapi/machine.json
index 72f014bb5b..cb878acdac 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -544,48 +544,6 @@
    'dst': 'uint16',
    'val': 'uint8' }}
 
-##
-# @X86CPURegister32:
-#
-# A X86 32-bit register
-#
-# Since: 1.5
-##
-{ 'enum': 'X86CPURegister32',
-  'data': [ 'EAX', 'EBX', 'ECX', 'EDX', 'ESP', 'EBP', 'ESI', 'EDI' ] }
-
-##
-# @X86CPUFeatureWordInfo:
-#
-# Information about a X86 CPU feature word
-#
-# @cpuid-input-eax: Input EAX value for CPUID instruction for that feature word
-#
-# @cpuid-input-ecx: Input ECX value for CPUID instruction for that
-#                   feature word
-#
-# @cpuid-register: Output register containing the feature bits
-#
-# @features: value of output register, containing the feature bits
-#
-# Since: 1.5
-##
-{ 'struct': 'X86CPUFeatureWordInfo',
-  'data': { 'cpuid-input-eax': 'int',
-            '*cpuid-input-ecx': 'int',
-            'cpuid-register': 'X86CPURegister32',
-            'features': 'int' } }
-
-##
-# @DummyForceArrays:
-#
-# Not used by QMP; hack to let us use X86CPUFeatureWordInfoList internally
-#
-# Since: 2.5
-##
-{ 'struct': 'DummyForceArrays',
-  'data': { 'unused': ['X86CPUFeatureWordInfo'] } }
-
 ##
 # @NumaCpuOptions:
 #
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 3ffd877dd5..d45fa217cc 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -38,7 +38,7 @@
 #include "qemu/option.h"
 #include "qemu/config-file.h"
 #include "qapi/error.h"
-#include "qapi/qapi-visit-machine.h"
+#include "qapi/qapi-visit-machine-target.h"
 #include "qapi/qapi-visit-run-state.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qerror.h"
diff --git a/target/i386/feature-stub.c b/target/i386/feature-stub.c
new file mode 100644
index 0000000000..787c3c7fa1
--- /dev/null
+++ b/target/i386/feature-stub.c
@@ -0,0 +1,23 @@
+/*
+ * QAPI x86 CPU features stub
+ *
+ * Copyright (c) 2020 Red Hat, Inc.
+ *
+ * Author:
+ *   Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qapi/qapi-visit-machine-target.h"
+
+bool visit_type_X86CPUFeatureWordInfoList(Visitor *v, const char *name,
+                                          X86CPUFeatureWordInfoList **obj,
+                                          Error **errp)
+{
+    g_assert_not_reached();
+}
diff --git a/target/i386/meson.build b/target/i386/meson.build
index e0b71ade56..0c5d9e6caf 100644
--- a/target/i386/meson.build
+++ b/target/i386/meson.build
@@ -5,6 +5,7 @@ i386_ss.add(files(
   'helper.c',
   'xsave_helper.c',
 ))
+i386_ss.add(when: 'CONFIG_SOFTMMU', if_false: files('feature-stub.c'))
 i386_ss.add(when: 'CONFIG_TCG', if_true: files(
   'bpt_helper.c',
   'cc_helper.c',
-- 
2.26.2