On 10/7/2026 4:47 AM, Yonggang Luo wrote:
> This allows a combined binary to register machine types from all its targets.
> Consequently, QMP `query-machines` can return machine entries from every
> target, even when `none` is selected. For example, a client can query the
> combined machine list with:
>
> ```json
> { "execute": "query-machines" }
> ```
>
> The returned list includes the registered machine classes from all linked
> targets. This is separate from selecting a machine: with `-target none`,
> `-M virt` reports the targets that provide `virt` instead of choosing one
> arbitrarily:
>
> ```text
> qemu-system -target none -M virt
> unsupported machine type: "virt" for target "none"
> Available for targets:
> aarch64
> arm
> ```
>
>From the long conversation on a previous thread, I thought we reached
the conclusion that if we didn't expose any ambiguous name, then -target
option is unnecessary, or maybe I got lost on track of this thread.
https://lore.kernel.org/qemu-devel/[email protected]/
I'm not sure which semantic we want to have with -target none. If there
is no ambiguous name registered, we just don't need it at all. It's a
win-win IMHO.
> It moves target_info() to a shared location so object.c can call it when
> checking machine availability. The series also replaces QOM-based target-info
> registration with a constructor list and passes TargetInfo to the
> is_available callback.
>
> Target metadata and architecture checks are generated from the configured
> targets, there is too much arch to write biiolperate code. doing this for
> easier
> Add TargetInfo* to is_available
>
> The target-info API and implementation are shared, rather than compiled
> separately for every target.
>
> This series removes the per-target source files "configs/targets/*.c".
> Their target-specific parameters are collected in a generated
> target-info-def.c for each softmmu target. This lays the groundwork for
> QEMU system builds in which target-info-def.c is the only target-specific
> source file compiled for each target. Using the same filename lets
> meson.build handle these definitions uniformly.
>
> The series adds unit-test coverage for target info and multi-target builds.
>
> Pierrick Bouvier (2):
> configs/targets: remove target info definitions
> target-info: rename target-info-stub.c in target-info-def.c
>
> Yonggang Luo (6):
> target-info: rename target-info-impl.h to target-info-def.h
> target-info: replace QOM registration with a constructor list
> tests/unit: add target-info coverage for multi-target builds
> meson: load all target .mak files into target_mak_all
> target-info: Replace handwritten architecture checks with generated
> code
> qom: pass TargetInfo to is_available for later use
>
> MAINTAINERS | 2 +-
> configs/targets/aarch64-softmmu.c | 25 ------
> configs/targets/arm-softmmu.c | 25 ------
> configs/targets/meson.build | 6 --
> configs/targets/riscv32-softmmu.c | 24 -----
> configs/targets/riscv64-softmmu.c | 24 -----
> hw/arm/aspeed_ast27x0-fc.c | 2 +-
> hw/arm/aspeed_ast27x0_evb.c | 4 +-
> hw/arm/raspi.c | 4 +-
> hw/arm/raspi4b.c | 2 +-
> hw/arm/virt.c | 4 +-
> hw/m68k/virt.c | 4 +-
> hw/or1k/virt.c | 2 +-
> include/hw/core/cpu.h | 2 +-
> include/qemu/module.h | 1 -
> include/qemu/target-info-def.h | 88 ++++++++++++++++++
> include/qemu/target-info-impl.h | 42 ---------
> include/qemu/target-info-init.h | 53 -----------
> include/qemu/target-info-qom.h | 31 -------
> include/qemu/target-info.h | 87 ++++--------------
> include/qom/object.h | 12 ++-
> meson.build | 52 ++++++++---
> page-vary-common.c | 2 +-
> page-vary-system.c | 2 +-
> qom/object.c | 3 +-
> scripts/gen-target-info.py | 99 ++++++++++++++++++++
> system/vl.c | 4 -
> target-info-stub.c => target-info-def.c | 3 +-
> target-info-qom.c | 60 -------------
> target-info.c | 115 ++++++++++++------------
> tests/qtest/fuzz/fuzz.c | 3 -
> tests/unit/meson.build | 4 +
> tests/unit/test-multi-target.c | 12 +--
> tests/unit/test-target-info.c | 38 ++++++++
> 34 files changed, 379 insertions(+), 462 deletions(-)
> delete mode 100644 configs/targets/aarch64-softmmu.c
> delete mode 100644 configs/targets/arm-softmmu.c
> delete mode 100644 configs/targets/meson.build
> delete mode 100644 configs/targets/riscv32-softmmu.c
> delete mode 100644 configs/targets/riscv64-softmmu.c
> create mode 100644 include/qemu/target-info-def.h
> delete mode 100644 include/qemu/target-info-impl.h
> delete mode 100644 include/qemu/target-info-init.h
> delete mode 100644 include/qemu/target-info-qom.h
> create mode 100644 scripts/gen-target-info.py
> rename target-info-stub.c => target-info-def.c (94%)
> delete mode 100644 target-info-qom.c
> create mode 100644 tests/unit/test-target-info.c
>
