On 18/4/25 19:07, Pierrick Bouvier wrote:
On 4/18/25 10:04, Philippe Mathieu-Daudé wrote:
On 18/4/25 18:30, Pierrick Bouvier wrote:
On 4/18/25 07:07, Philippe Mathieu-Daudé wrote:
On 18/4/25 05:07, Pierrick Bouvier wrote:
On 4/17/25 17:50, Philippe Mathieu-Daudé wrote:
Define the TYPE_TARGET_ARM_MACHINE and TYPE_TARGET_AARCH64_MACHINE
QOM interface names to allow machines to implement them.
Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
---
meson.build | 1 +
include/hw/boards.h | 1 +
include/qemu/target_info-qom.h | 18 ++++++++++++++++++
target_info-qom.c | 24 ++++++++++++++++++++++++
4 files changed, 44 insertions(+)
create mode 100644 include/qemu/target_info-qom.h
create mode 100644 target_info-qom.c
diff --git a/meson.build b/meson.build
index 49a050a28a3..168b07b5887 100644
--- a/meson.build
+++ b/meson.build
@@ -3808,6 +3808,7 @@ common_ss.add(pagevary)
specific_ss.add(files('page-target.c', 'page-vary-target.c'))
common_ss.add(files('target_info.c'))
+system_ss.add(files('target_info-qom.c'))
specific_ss.add(files('target_info-stub.c'))
subdir('backends')
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 02f43ac5d4d..b1bbf3c34d4 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -7,6 +7,7 @@
#include "system/hostmem.h"
#include "system/blockdev.h"
#include "qapi/qapi-types-machine.h"
+#include "qemu/target_info-qom.h"
#include "qemu/module.h"
#include "qom/object.h"
#include "hw/core/cpu.h"
diff --git a/include/qemu/target_info-qom.h b/include/qemu/
target_info-qom.h
new file mode 100644
index 00000000000..7eb9b6bd254
--- /dev/null
+++ b/include/qemu/target_info-qom.h
@@ -0,0 +1,18 @@
+/*
+ * QEMU binary/target API (QOM types)
+ *
+ * Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef QEMU_TARGET_INFO_QOM_H
+#define QEMU_TARGET_INFO_QOM_H
+
+#define TYPE_TARGET_ARM_MACHINE \
+ "target-info-arm-machine"
+
+#define TYPE_TARGET_AARCH64_MACHINE \
+ "target-info-aarch64-machine"
+
+#endif
diff --git a/target_info-qom.c b/target_info-qom.c
new file mode 100644
index 00000000000..d3fee57361b
--- /dev/null
+++ b/target_info-qom.c
@@ -0,0 +1,24 @@
+/*
+ * QEMU binary/target API (QOM types)
+ *
+ * Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/target_info-qom.h"
+#include "qom/object.h"
+
+static const TypeInfo target_info_types[] = {
+ {
+ .name = TYPE_TARGET_ARM_MACHINE,
+ .parent = TYPE_INTERFACE,
+ },
+ {
+ .name = TYPE_TARGET_AARCH64_MACHINE,
+ .parent = TYPE_INTERFACE,
+ },
+};
+
+DEFINE_TYPES(target_info_types)
Ideally, this should be in target/arm, as this type will only be
used by
boards in hw/arm, and by the target_info specialization.
Not the way QOM works, interfaces must be registered, which is
why I use this centralized file. Otherwise we get:
$ qemu-system-sh4 -M help
qemu-system-sh4: -M help: missing interface 'target-info-arm-machine'
for object 'machine'
If I'm correct, types can be registered anywhere, since they rely on
static initializer, but in qemu-system-sh4, hw/arm or target/arm is not
linked, so it fails.
I guess this is the null board that is creating this situation, since
it's included by all binaries.
Correct.
I see two solutions while still moving those types in target/arm:
- include this type file in libcommon, so it's always linked.
- introduce a new TYPE_TARGET_ALL_MACHINE, and always include it in list
of machines. But I think it's not so good as it would require to deal
with a list of types when we want to access a machine.
So I would just move the file and link it inconditonnally in all
binaries.
Which file? target_info-qom.c is already in system_ss[].
Move existing target_info-qom in in target/arm/target_info_types.c, and
add it to system_ss, instead of arm_ss or arm_common_ss, so it's always
linked.
That should work, but what is the benefit over having a single file
where all definitions are concentrated?
