[RFC 7/9] target/arm: Add CPU features to query-cpu-model-expansion

[Peng Liang]

Add CPU features to the result of query-cpu-model-expansion so that
other applications (such as libvirt) can know the supported CPU
features.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 target/arm/cpu.c     | 41 +++++++++++++++++++++++++++++++++++++++++
 target/arm/cpu.h     |  2 ++
 target/arm/monitor.c |  2 ++
 3 files changed, 45 insertions(+)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 3fc54cb3a4..0f620e8afe 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -25,6 +25,8 @@
 #include "qemu/module.h"
 #include "qapi/error.h"
 #include "qapi/visitor.h"
+#include "qapi/qmp/qdict.h"
+#include "qom/qom-qobject.h"
 #include "cpu.h"
 #include "internals.h"
 #include "exec/exec-all.h"
@@ -1515,6 +1517,45 @@ static const CPUFeatureDep feature_dependencies[] = {
     },
 };
 
+static char *strtolower(char *src)
+{
+    char *start = src;
+
+    for (; *src; ++src) {
+        *src = tolower(*src);
+    }
+
+    return start;
+}
+
+void arm_cpu_features_to_dict(ARMCPU *cpu, QDict *features)
+{
+    Object *obj = OBJECT(cpu);
+    const char *name;
+    ObjectProperty *prop;
+    bool is_32bit = !arm_feature(&cpu->env, ARM_FEATURE_AARCH64);
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(cpu_features); ++i) {
+        if (is_32bit != cpu_features[i].is_32bit) {
+            continue;
+        }
+
+        name = cpu_features[i].name;
+        prop = object_property_find(obj, name, NULL);
+        if (prop) {
+            QObject *value;
+            g_autofree char *tmp;
+
+            assert(prop->get);
+            value = object_property_get_qobject(obj, name, &error_abort);
+            tmp = strtolower(g_strdup(name));
+
+            qdict_put_obj(features, tmp, value);
+        }
+    }
+}
+
 static void arm_cpu_get_bit_prop(Object *obj, Visitor *v, const char *name,
                                  void *opaque, Error **errp)
 {
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 5d8074d03b..da68b7f8f4 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3933,4 +3933,6 @@ static inline bool isar_feature_any_tts2uxn(const 
ARMISARegisters *id)
 #define cpu_isar_feature(name, cpu) \
     ({ ARMCPU *cpu_ = (cpu); isar_feature_##name(&cpu_->isar); })
 
+void arm_cpu_features_to_dict(ARMCPU *cpu, QDict *features);
+
 #endif
diff --git a/target/arm/monitor.c b/target/arm/monitor.c
index ba6e01abd0..f8eb29efec 100644
--- a/target/arm/monitor.c
+++ b/target/arm/monitor.c
@@ -225,6 +225,8 @@ CpuModelExpansionInfo 
*qmp_query_cpu_model_expansion(CpuModelExpansionType type,
         }
     }
 
+    arm_cpu_features_to_dict(ARM_CPU(obj), qdict_out);
+
     if (!qdict_size(qdict_out)) {
         qobject_unref(qdict_out);
     } else {
-- 
2.18.4