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system/vl: Filter machine list available for a particular target binary

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Binaries can register a QOM type to filter their machines
by filling their TargetInfo::machine_typename field.

This can be used by example by main() -> machine_help_func()
to filter the machines list.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-03-23 22:46:34 +01:00 • committed by Richard Henderson
parent 5e5a9aea79
commit 28502121be
5 changed files with 19 additions and 1 deletions
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2
include/qemu/target-info-impl.h
View file

@ -14,6 +14,8 @@
typedef struct TargetInfo {
/* runtime equivalent of TARGET_NAME definition */
const char *target_name;
/* QOM typename machines for this binary must implement */
const char *machine_typename;
} TargetInfo;
/**

8
include/qemu/target-info.h
View file

@ -16,6 +16,14 @@
*/
const char *target_name(void);
/**
* target_machine_typename:
*
* Returns: Name of the QOM interface implemented by machines
* usable on this target binary.
*/
const char *target_machine_typename(void);
/**
* target_cpu_type:
*

3
system/vl.c
View file

@ -27,6 +27,7 @@
#include "qemu/datadir.h"
#include "qemu/units.h"
#include "qemu/module.h"
#include "qemu/target-info.h"
#include "exec/cpu-common.h"
#include "exec/page-vary.h"
#include "hw/qdev-properties.h"
@ -1564,7 +1565,7 @@ static void machine_help_func(const QDict *qdict)
GSList *el;
const char *type = qdict_get_try_str(qdict, "type");
machines = object_class_get_list(TYPE_MACHINE, false);
machines = object_class_get_list(target_machine_typename(), false);
if (type) {
ObjectClass *machine_class = OBJECT_CLASS(find_machine(type, machines));
if (machine_class) {

2
target-info-stub.c
View file

@ -9,10 +9,12 @@
#include "qemu/osdep.h"
#include "qemu/target-info.h"
#include "qemu/target-info-impl.h"
#include "hw/boards.h"
#include "cpu.h"
static const TargetInfo target_info_stub = {
.target_name = TARGET_NAME,
.machine_typename = TYPE_MACHINE,
};
const TargetInfo *target_info(void)

5
target-info.c
View file

@ -14,3 +14,8 @@ const char *target_name(void)
{
return target_info()->target_name;
}
const char *target_machine_typename(void)
{
return target_info()->machine_typename;
}