Re: [PATCH 00/27] single-binary: implement dynamic filtering for machine types

On 7/23/2026 5:09 PM, Pierrick Bouvier wrote:
> Now that we can link a single-binary with at least two targets (arm, aarch64),
> we want to make sure that we expose the same set of machines (later devices and
> cpus) than target binaries. For that, we implemented a static filtering based on
> target interfaces that each machine will implement to declare which targets have
> this machine.
> 
> However, we discovered that this static filtering is not enough. Indeed, some
> machines and devices do not depend only on target, and their presence can depend
> on Kconfig or host/target combination. Thus, our static approach can't work, and
> we need something more flexible.
> 
> This series adds a new TYPE_TARGET_SPECIFIC, that declare a single function
> bool is_available(void). From there, any machine type (and later devices and
> cpus) can implement it to override their presence for each target.
> We first replace the existing static mechanism with this, and once done, we
> cleanup all the old interface. One nice benefit is that we can get rid of
> config/targets/*.c files, which saves duplication.
> 
> This series was tested by comparing list of machines for all qemu system
> binaries, before and after this change, to make sure we don't introduce a
> regression.
> 
> Pierrick Bouvier (27):
>   include/qemu/target-info-qom.h: declare TYPE_TARGET_SPECIFIC interface
>   hw/arm: implement TYPE_TARGET_SPECIFIC
>   target-info: add target_riscv32 and target_base_riscv
>   hw/riscv: implement TYPE_TARGET_SPECIFIC
>   target-info: add target_config_multiprocess
>   hw/remote/machine: remove unsupported arm target
>   hw/remote/machine: implement TYPE_TARGET_SPECIFIC
>   target-info: add target_config_xen
>   hw/arm/xen-pvh: implement TYPE_TARGET_SPECIFIC
>   hw/xenpv/xen_machine_pv: implement TYPE_TARGET_SPECIFIC
>   target-info: add target_config_nitro
>   hw/nitro/machine: implement TYPE_TARGET_SPECIFIC
>   target-info-qom: implement new machine filtering per target
>   target-info-qom: use TYPE_MACHINE instead of target_machine_typename
>   target-info: remove target_machine_typename
>   target-info-qom: add type_target_specific
>   hw/arm: remove TYPE_TARGET_{AARCH64,ARM}_MACHINE
>   hw/arm: remove {arm,arm_aarch64,aarch64}_machine_interfaces
>   include/hw/core/boards.h: add DEFINE_MACHINE_TARGET_SPECIFIC
>   hw/arm: remove DEFINE_MACHINE_{AARCH64,ARM}
>   hw/arm: remove machines-qom.h
>   hw/riscv: remove TYPE_TARGET_{RISCV32,RISCV64}_MACHINE
>   hw/riscv: remove {riscv32,riscv32_64,riscv64}_machine_interfaces
>   hw/riscv: remove DEFINE_MACHINE_{RISCV32,RISCV64}
>   hw/riscv: remove machines-qom.h
>   configs/targets: remove target info definitions
>   target-info: rename target-info-stub.c in target-info-def.c
> 

Gentle ping after a week.
You're welcome to review only your architecture if time is limited, and
validate the global approach.

Regards,
Pierrick