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[RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API

Philippe Mathieu-Daudé posted 11 patches 9 months, 3 weeks ago
There is a newer version of this series
[RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API
Posted by Philippe Mathieu-Daudé 9 months, 3 weeks ago 
Have target_name() be a target-agnostic method, dispatching
to a per-target TargetInfo singleton structure.
By default a stub singleton is used. No logical change
expected.

Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 meson.build                     |  3 +++
 include/hw/core/cpu.h           |  2 --
 include/qemu/target_info-impl.h | 23 +++++++++++++++++++++++
 include/qemu/target_info.h      | 19 +++++++++++++++++++
 cpu-target.c                    |  5 -----
 hw/core/machine-qmp-cmds.c      |  1 +
 plugins/loader.c                |  2 +-
 system/vl.c                     |  2 +-
 target_info-stub.c              | 19 +++++++++++++++++++
 target_info.c                   | 16 ++++++++++++++++
 10 files changed, 83 insertions(+), 9 deletions(-)
 create mode 100644 include/qemu/target_info-impl.h
 create mode 100644 include/qemu/target_info.h
 create mode 100644 target_info-stub.c
 create mode 100644 target_info.c

diff --git a/meson.build b/meson.build
index bcb9d39a387..49a050a28a3 100644
--- a/meson.build
+++ b/meson.build
@@ -3807,6 +3807,9 @@ endif
 common_ss.add(pagevary)
 specific_ss.add(files('page-target.c', 'page-vary-target.c'))
 
+common_ss.add(files('target_info.c'))
+specific_ss.add(files('target_info-stub.c'))
+
 subdir('backends')
 subdir('disas')
 subdir('migration')
diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index 5b645df59f5..9d9448341d1 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -1115,8 +1115,6 @@ bool cpu_exec_realizefn(CPUState *cpu, Error **errp);
 void cpu_exec_unrealizefn(CPUState *cpu);
 void cpu_exec_reset_hold(CPUState *cpu);
 
-const char *target_name(void);
-
 #ifdef COMPILING_PER_TARGET
 
 extern const VMStateDescription vmstate_cpu_common;
diff --git a/include/qemu/target_info-impl.h b/include/qemu/target_info-impl.h
new file mode 100644
index 00000000000..d5c94ed5296
--- /dev/null
+++ b/include/qemu/target_info-impl.h
@@ -0,0 +1,23 @@
+/*
+ * QEMU binary/target API ...
+ *
+ *  Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef QEMU_TARGET_INFO_IMPL_H
+#define QEMU_TARGET_INFO_IMPL_H
+
+#include "qemu/target_info.h"
+
+typedef struct TargetInfo {
+
+    /* runtime equivalent of TARGET_NAME definition */
+    const char *const name;
+
+} TargetInfo;
+
+const TargetInfo *target_info(void);
+
+#endif
diff --git a/include/qemu/target_info.h b/include/qemu/target_info.h
new file mode 100644
index 00000000000..3f6cbbbd300
--- /dev/null
+++ b/include/qemu/target_info.h
@@ -0,0 +1,19 @@
+/*
+ * QEMU binary/target API
+ *
+ *  Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef QEMU_TARGET_INFO_H
+#define QEMU_TARGET_INFO_H
+
+/**
+ * target_name:
+ *
+ * Returns: Canonical target name (i.e. "i386").
+ */
+const char *target_name(void);
+
+#endif
diff --git a/cpu-target.c b/cpu-target.c
index c99d208a7c4..3f82d3ea444 100644
--- a/cpu-target.c
+++ b/cpu-target.c
@@ -165,8 +165,3 @@ bool target_words_bigendian(void)
 {
     return TARGET_BIG_ENDIAN;
 }
-
-const char *target_name(void)
-{
-    return TARGET_NAME;
-}
diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index 408994b67d7..b317aec234f 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -19,6 +19,7 @@
 #include "qapi/qobject-input-visitor.h"
 #include "qapi/type-helpers.h"
 #include "qemu/uuid.h"
+#include "qemu/target_info.h"
 #include "qom/qom-qobject.h"
 #include "system/hostmem.h"
 #include "system/hw_accel.h"
diff --git a/plugins/loader.c b/plugins/loader.c
index 7523d554f03..36a4e88d4db 100644
--- a/plugins/loader.c
+++ b/plugins/loader.c
@@ -29,7 +29,7 @@
 #include "qemu/xxhash.h"
 #include "qemu/plugin.h"
 #include "qemu/memalign.h"
-#include "hw/core/cpu.h"
+#include "qemu/target_info.h"
 #include "exec/tb-flush.h"
 
 #include "plugin.h"
diff --git a/system/vl.c b/system/vl.c
index c17945c4939..d8a0fe713c9 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -40,6 +40,7 @@
 #include "qemu/help_option.h"
 #include "qemu/hw-version.h"
 #include "qemu/uuid.h"
+#include "qemu/target_info.h"
 #include "system/reset.h"
 #include "system/runstate.h"
 #include "system/runstate-action.h"
@@ -79,7 +80,6 @@
 #include "hw/block/block.h"
 #include "hw/i386/x86.h"
 #include "hw/i386/pc.h"
-#include "hw/core/cpu.h"
 #include "migration/cpr.h"
 #include "migration/misc.h"
 #include "migration/snapshot.h"
diff --git a/target_info-stub.c b/target_info-stub.c
new file mode 100644
index 00000000000..1e44bb6f6fb
--- /dev/null
+++ b/target_info-stub.c
@@ -0,0 +1,19 @@
+/*
+ * QEMU target info stubs
+ *
+ *  Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/target_info-impl.h"
+
+static const TargetInfo target_info_stub = {
+    .name = TARGET_NAME,
+};
+
+const TargetInfo *target_info(void)
+{
+    return &target_info_stub;
+}
diff --git a/target_info.c b/target_info.c
new file mode 100644
index 00000000000..877a6a15014
--- /dev/null
+++ b/target_info.c
@@ -0,0 +1,16 @@
+/*
+ * QEMU binary/target helpers
+ *
+ *  Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/target_info-impl.h"
+#include "qemu/target_info.h"
+
+const char *target_name(void)
+{
+    return target_info()->name;
+}
-- 
2.47.1
Re: [RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API
Posted by Pierrick Bouvier 9 months, 3 weeks ago 
On 4/17/25 17:50, Philippe Mathieu-Daudé wrote:
> Have target_name() be a target-agnostic method, dispatching
> to a per-target TargetInfo singleton structure.
> By default a stub singleton is used. No logical change
> expected.
> 
> Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
>   meson.build                     |  3 +++
>   include/hw/core/cpu.h           |  2 --
>   include/qemu/target_info-impl.h | 23 +++++++++++++++++++++++
>   include/qemu/target_info.h      | 19 +++++++++++++++++++
>   cpu-target.c                    |  5 -----
>   hw/core/machine-qmp-cmds.c      |  1 +
>   plugins/loader.c                |  2 +-
>   system/vl.c                     |  2 +-
>   target_info-stub.c              | 19 +++++++++++++++++++
>   target_info.c                   | 16 ++++++++++++++++
>   10 files changed, 83 insertions(+), 9 deletions(-)
>   create mode 100644 include/qemu/target_info-impl.h
>   create mode 100644 include/qemu/target_info.h
>   create mode 100644 target_info-stub.c
>   create mode 100644 target_info.c
> 
> diff --git a/meson.build b/meson.build
> index bcb9d39a387..49a050a28a3 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -3807,6 +3807,9 @@ endif
>   common_ss.add(pagevary)
>   specific_ss.add(files('page-target.c', 'page-vary-target.c'))
>   
> +common_ss.add(files('target_info.c'))
> +specific_ss.add(files('target_info-stub.c'))
> +
>   subdir('backends')
>   subdir('disas')
>   subdir('migration')
> diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
> index 5b645df59f5..9d9448341d1 100644
> --- a/include/hw/core/cpu.h
> +++ b/include/hw/core/cpu.h
> @@ -1115,8 +1115,6 @@ bool cpu_exec_realizefn(CPUState *cpu, Error **errp);
>   void cpu_exec_unrealizefn(CPUState *cpu);
>   void cpu_exec_reset_hold(CPUState *cpu);
>   
> -const char *target_name(void);
> -
>   #ifdef COMPILING_PER_TARGET
>   
>   extern const VMStateDescription vmstate_cpu_common;
> diff --git a/include/qemu/target_info-impl.h b/include/qemu/target_info-impl.h
> new file mode 100644
> index 00000000000..d5c94ed5296
> --- /dev/null
> +++ b/include/qemu/target_info-impl.h
> @@ -0,0 +1,23 @@
> +/*
> + * QEMU binary/target API ...
> + *
> + *  Copyright (c) Linaro
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#ifndef QEMU_TARGET_INFO_IMPL_H
> +#define QEMU_TARGET_INFO_IMPL_H
> +
> +#include "qemu/target_info.h"
> +
> +typedef struct TargetInfo {
> +
> +    /* runtime equivalent of TARGET_NAME definition */
> +    const char *const name;
> +
> +} TargetInfo;
> +
> +const TargetInfo *target_info(void);
> +
> +#endif
> diff --git a/include/qemu/target_info.h b/include/qemu/target_info.h
> new file mode 100644
> index 00000000000..3f6cbbbd300
> --- /dev/null
> +++ b/include/qemu/target_info.h
> @@ -0,0 +1,19 @@
> +/*
> + * QEMU binary/target API
> + *
> + *  Copyright (c) Linaro
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#ifndef QEMU_TARGET_INFO_H
> +#define QEMU_TARGET_INFO_H
> +
> +/**
> + * target_name:
> + *
> + * Returns: Canonical target name (i.e. "i386").
> + */
> +const char *target_name(void);
> +
> +#endif
> diff --git a/cpu-target.c b/cpu-target.c
> index c99d208a7c4..3f82d3ea444 100644
> --- a/cpu-target.c
> +++ b/cpu-target.c
> @@ -165,8 +165,3 @@ bool target_words_bigendian(void)
>   {
>       return TARGET_BIG_ENDIAN;
>   }
> -
> -const char *target_name(void)
> -{
> -    return TARGET_NAME;
> -}
> diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
> index 408994b67d7..b317aec234f 100644
> --- a/hw/core/machine-qmp-cmds.c
> +++ b/hw/core/machine-qmp-cmds.c
> @@ -19,6 +19,7 @@
>   #include "qapi/qobject-input-visitor.h"
>   #include "qapi/type-helpers.h"
>   #include "qemu/uuid.h"
> +#include "qemu/target_info.h"
>   #include "qom/qom-qobject.h"
>   #include "system/hostmem.h"
>   #include "system/hw_accel.h"
> diff --git a/plugins/loader.c b/plugins/loader.c
> index 7523d554f03..36a4e88d4db 100644
> --- a/plugins/loader.c
> +++ b/plugins/loader.c
> @@ -29,7 +29,7 @@
>   #include "qemu/xxhash.h"
>   #include "qemu/plugin.h"
>   #include "qemu/memalign.h"
> -#include "hw/core/cpu.h"
> +#include "qemu/target_info.h"
>   #include "exec/tb-flush.h"
>   
>   #include "plugin.h"
> diff --git a/system/vl.c b/system/vl.c
> index c17945c4939..d8a0fe713c9 100644
> --- a/system/vl.c
> +++ b/system/vl.c
> @@ -40,6 +40,7 @@
>   #include "qemu/help_option.h"
>   #include "qemu/hw-version.h"
>   #include "qemu/uuid.h"
> +#include "qemu/target_info.h"
>   #include "system/reset.h"
>   #include "system/runstate.h"
>   #include "system/runstate-action.h"
> @@ -79,7 +80,6 @@
>   #include "hw/block/block.h"
>   #include "hw/i386/x86.h"
>   #include "hw/i386/pc.h"
> -#include "hw/core/cpu.h"
>   #include "migration/cpr.h"
>   #include "migration/misc.h"
>   #include "migration/snapshot.h"
> diff --git a/target_info-stub.c b/target_info-stub.c
> new file mode 100644
> index 00000000000..1e44bb6f6fb
> --- /dev/null
> +++ b/target_info-stub.c
> @@ -0,0 +1,19 @@
> +/*
> + * QEMU target info stubs
> + *
> + *  Copyright (c) Linaro
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/target_info-impl.h"
> +
> +static const TargetInfo target_info_stub = {
> +    .name = TARGET_NAME,
> +};
> +
> +const TargetInfo *target_info(void)
> +{
> +    return &target_info_stub;
> +}
> diff --git a/target_info.c b/target_info.c
> new file mode 100644
> index 00000000000..877a6a15014
> --- /dev/null
> +++ b/target_info.c
> @@ -0,0 +1,16 @@
> +/*
> + * QEMU binary/target helpers
> + *
> + *  Copyright (c) Linaro
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/target_info-impl.h"
> +#include "qemu/target_info.h"
> +
> +const char *target_name(void)
> +{
> +    return target_info()->name;
> +}

What is the benefit to have two different files (common and specific)?
target_name() can be inline in the same header, returning the matching 
field in existing target_info, which does not need any specialization 
per target.
Re: [RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API
Posted by Philippe Mathieu-Daudé 9 months, 3 weeks ago 
On 18/4/25 05:01, Pierrick Bouvier wrote:
> On 4/17/25 17:50, Philippe Mathieu-Daudé wrote:
>> Have target_name() be a target-agnostic method, dispatching
>> to a per-target TargetInfo singleton structure.
>> By default a stub singleton is used. No logical change
>> expected.
>>
>> Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> ---
>>   meson.build                     |  3 +++
>>   include/hw/core/cpu.h           |  2 --
>>   include/qemu/target_info-impl.h | 23 +++++++++++++++++++++++
>>   include/qemu/target_info.h      | 19 +++++++++++++++++++
>>   cpu-target.c                    |  5 -----
>>   hw/core/machine-qmp-cmds.c      |  1 +
>>   plugins/loader.c                |  2 +-
>>   system/vl.c                     |  2 +-
>>   target_info-stub.c              | 19 +++++++++++++++++++
>>   target_info.c                   | 16 ++++++++++++++++
>>   10 files changed, 83 insertions(+), 9 deletions(-)
>>   create mode 100644 include/qemu/target_info-impl.h
>>   create mode 100644 include/qemu/target_info.h
>>   create mode 100644 target_info-stub.c
>>   create mode 100644 target_info.c


>> diff --git a/target_info-stub.c b/target_info-stub.c
>> new file mode 100644
>> index 00000000000..1e44bb6f6fb
>> --- /dev/null
>> +++ b/target_info-stub.c
>> @@ -0,0 +1,19 @@
>> +/*
>> + * QEMU target info stubs
>> + *
>> + *  Copyright (c) Linaro
>> + *
>> + * SPDX-License-Identifier: GPL-2.0-or-later
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +#include "qemu/target_info-impl.h"
>> +
>> +static const TargetInfo target_info_stub = {
>> +    .name = TARGET_NAME,
>> +};
>> +
>> +const TargetInfo *target_info(void)
>> +{
>> +    return &target_info_stub;
>> +}
>> diff --git a/target_info.c b/target_info.c
>> new file mode 100644
>> index 00000000000..877a6a15014
>> --- /dev/null
>> +++ b/target_info.c
>> @@ -0,0 +1,16 @@
>> +/*
>> + * QEMU binary/target helpers
>> + *
>> + *  Copyright (c) Linaro
>> + *
>> + * SPDX-License-Identifier: GPL-2.0-or-later
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +#include "qemu/target_info-impl.h"
>> +#include "qemu/target_info.h"
>> +
>> +const char *target_name(void)
>> +{
>> +    return target_info()->name;
>> +}
> 
> What is the benefit to have two different files (common and specific)?
> target_name() can be inline in the same header, returning the matching 
> field in existing target_info, which does not need any specialization 
> per target.

common interface exposed target-agnostic, dispatching to target-specific
implementation (providing a stub we'll remove once all targets converted).

What would you suggest?
Re: [RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API
Posted by Pierrick Bouvier 9 months, 3 weeks ago 
On 4/18/25 07:02, Philippe Mathieu-Daudé wrote:
> On 18/4/25 05:01, Pierrick Bouvier wrote:
>> On 4/17/25 17:50, Philippe Mathieu-Daudé wrote:
>>> Have target_name() be a target-agnostic method, dispatching
>>> to a per-target TargetInfo singleton structure.
>>> By default a stub singleton is used. No logical change
>>> expected.
>>>
>>> Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>>> ---
>>>    meson.build                     |  3 +++
>>>    include/hw/core/cpu.h           |  2 --
>>>    include/qemu/target_info-impl.h | 23 +++++++++++++++++++++++
>>>    include/qemu/target_info.h      | 19 +++++++++++++++++++
>>>    cpu-target.c                    |  5 -----
>>>    hw/core/machine-qmp-cmds.c      |  1 +
>>>    plugins/loader.c                |  2 +-
>>>    system/vl.c                     |  2 +-
>>>    target_info-stub.c              | 19 +++++++++++++++++++
>>>    target_info.c                   | 16 ++++++++++++++++
>>>    10 files changed, 83 insertions(+), 9 deletions(-)
>>>    create mode 100644 include/qemu/target_info-impl.h
>>>    create mode 100644 include/qemu/target_info.h
>>>    create mode 100644 target_info-stub.c
>>>    create mode 100644 target_info.c
> 
> 
>>> diff --git a/target_info-stub.c b/target_info-stub.c
>>> new file mode 100644
>>> index 00000000000..1e44bb6f6fb
>>> --- /dev/null
>>> +++ b/target_info-stub.c
>>> @@ -0,0 +1,19 @@
>>> +/*
>>> + * QEMU target info stubs
>>> + *
>>> + *  Copyright (c) Linaro
>>> + *
>>> + * SPDX-License-Identifier: GPL-2.0-or-later
>>> + */
>>> +
>>> +#include "qemu/osdep.h"
>>> +#include "qemu/target_info-impl.h"
>>> +
>>> +static const TargetInfo target_info_stub = {
>>> +    .name = TARGET_NAME,
>>> +};
>>> +
>>> +const TargetInfo *target_info(void)
>>> +{
>>> +    return &target_info_stub;
>>> +}
>>> diff --git a/target_info.c b/target_info.c
>>> new file mode 100644
>>> index 00000000000..877a6a15014
>>> --- /dev/null
>>> +++ b/target_info.c
>>> @@ -0,0 +1,16 @@
>>> +/*
>>> + * QEMU binary/target helpers
>>> + *
>>> + *  Copyright (c) Linaro
>>> + *
>>> + * SPDX-License-Identifier: GPL-2.0-or-later
>>> + */
>>> +
>>> +#include "qemu/osdep.h"
>>> +#include "qemu/target_info-impl.h"
>>> +#include "qemu/target_info.h"
>>> +
>>> +const char *target_name(void)
>>> +{
>>> +    return target_info()->name;
>>> +}
>>
>> What is the benefit to have two different files (common and specific)?
>> target_name() can be inline in the same header, returning the matching
>> field in existing target_info, which does not need any specialization
>> per target.
> 
> common interface exposed target-agnostic, dispatching to target-specific
> implementation (providing a stub we'll remove once all targets converted).
> 
> What would you suggest?

To remove target_info.c and target_info-impl.h, and implement 
target_name() as a static inline in target_info.h.

This way, target_info.h can still be included from common code, the 
structure is directly accessed, and we have a single header where we can 
add new sugar functions and associated fields later.
Re: [RFC PATCH v2 02/11] qemu: Convert target_name() to TargetInfo API
Posted by Philippe Mathieu-Daudé 9 months, 3 weeks ago 
On 18/4/25 18:23, Pierrick Bouvier wrote:
> On 4/18/25 07:02, Philippe Mathieu-Daudé wrote:
>> On 18/4/25 05:01, Pierrick Bouvier wrote:
>>> On 4/17/25 17:50, Philippe Mathieu-Daudé wrote:
>>>> Have target_name() be a target-agnostic method, dispatching
>>>> to a per-target TargetInfo singleton structure.
>>>> By default a stub singleton is used. No logical change
>>>> expected.
>>>>
>>>> Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>>>> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>>>> ---
>>>>    meson.build                     |  3 +++
>>>>    include/hw/core/cpu.h           |  2 --
>>>>    include/qemu/target_info-impl.h | 23 +++++++++++++++++++++++
>>>>    include/qemu/target_info.h      | 19 +++++++++++++++++++
>>>>    cpu-target.c                    |  5 -----
>>>>    hw/core/machine-qmp-cmds.c      |  1 +
>>>>    plugins/loader.c                |  2 +-
>>>>    system/vl.c                     |  2 +-
>>>>    target_info-stub.c              | 19 +++++++++++++++++++
>>>>    target_info.c                   | 16 ++++++++++++++++
>>>>    10 files changed, 83 insertions(+), 9 deletions(-)
>>>>    create mode 100644 include/qemu/target_info-impl.h
>>>>    create mode 100644 include/qemu/target_info.h
>>>>    create mode 100644 target_info-stub.c
>>>>    create mode 100644 target_info.c
>>
>>
>>>> diff --git a/target_info-stub.c b/target_info-stub.c
>>>> new file mode 100644
>>>> index 00000000000..1e44bb6f6fb
>>>> --- /dev/null
>>>> +++ b/target_info-stub.c
>>>> @@ -0,0 +1,19 @@
>>>> +/*
>>>> + * QEMU target info stubs
>>>> + *
>>>> + *  Copyright (c) Linaro
>>>> + *
>>>> + * SPDX-License-Identifier: GPL-2.0-or-later
>>>> + */
>>>> +
>>>> +#include "qemu/osdep.h"
>>>> +#include "qemu/target_info-impl.h"
>>>> +
>>>> +static const TargetInfo target_info_stub = {
>>>> +    .name = TARGET_NAME,
>>>> +};
>>>> +
>>>> +const TargetInfo *target_info(void)
>>>> +{
>>>> +    return &target_info_stub;
>>>> +}
>>>> diff --git a/target_info.c b/target_info.c
>>>> new file mode 100644
>>>> index 00000000000..877a6a15014
>>>> --- /dev/null
>>>> +++ b/target_info.c
>>>> @@ -0,0 +1,16 @@
>>>> +/*
>>>> + * QEMU binary/target helpers
>>>> + *
>>>> + *  Copyright (c) Linaro
>>>> + *
>>>> + * SPDX-License-Identifier: GPL-2.0-or-later
>>>> + */
>>>> +
>>>> +#include "qemu/osdep.h"
>>>> +#include "qemu/target_info-impl.h"
>>>> +#include "qemu/target_info.h"
>>>> +
>>>> +const char *target_name(void)
>>>> +{
>>>> +    return target_info()->name;
>>>> +}
>>>
>>> What is the benefit to have two different files (common and specific)?
>>> target_name() can be inline in the same header, returning the matching
>>> field in existing target_info, which does not need any specialization
>>> per target.
>>
>> common interface exposed target-agnostic, dispatching to target-specific
>> implementation (providing a stub we'll remove once all targets 
>> converted).
>>
>> What would you suggest?
> 
> To remove target_info.c and target_info-impl.h, and implement 
> target_name() as a static inline in target_info.h.
> 
> This way, target_info.h can still be included from common code, the 
> structure is directly accessed, and we have a single header where we can 
> add new sugar functions and associated fields later.

OK. As I'm about to post a good-enough v3, I'll not implement this
now, but will consider for v4.

Patchew 2.1-devel-b67e4c2

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