Hi, following last week KVM call [1], I'm posting my playground machine to slowly work toward heterogeneous QEMU. This is orthogonal to Paolo / Markus / Daniel effort to have a qemu-system-qmp CLI entrypoint [2].
After refactoring a bit the headers to remove target-specific dependencies, we can remove the targets (and accelerators) from the picture, to have a target-agnostic QEMU. This binary helps to find a lot of code abuses where we only expect one target being built, and is useful to clean that. So far my naive roadmap draft is: - Ignoring target-specific hardware devices, target-agnostic code should only use the CPUClass and CPUState to interface with the target-specific code. - CPU objects shouldn't access an unique global accelerator, but should be initialized with a specific accelerator. - Each target registers as a QEMU module. Should we expose a target API beside the CPU? - Compile TCG-target-specific objects in each target dir? - Refactor buildsys to register multiple targets. - TBC. [1] https://lore.kernel.org/qemu-devel/87fsot761s.fsf@secure.mitica/ [2] https://lore.kernel.org/qemu-devel/20220208144458.1079634-1-pbonz...@redhat.com/ Based-on: <20220214183144.27402-1-f4...@amsat.org> "target: Use ArchCPU & CPUArchState as abstract interface to target CPU" https://lore.kernel.org/qemu-devel/20220214183144.27402-1-f4...@amsat.org/ Philippe Mathieu-Daudé (1): target: Add system emulation aiming to target any architecture configs/devices/any-softmmu/default.mak | 1 + configs/targets/any-softmmu.mak | 3 +++ hw/any/meson.build | 5 +++++ hw/meson.build | 1 + include/sysemu/arch_init.h | 1 + meson.build | 6 +++-- qapi/machine.json | 2 +- target/Kconfig | 1 + target/any/Kconfig | 4 ++++ target/any/cpu-param.h | 30 +++++++++++++++++++++++++ target/any/cpu.h | 26 +++++++++++++++++++++ target/any/meson.build | 8 +++++++ target/meson.build | 1 + 13 files changed, 86 insertions(+), 3 deletions(-) create mode 100644 configs/devices/any-softmmu/default.mak create mode 100644 configs/targets/any-softmmu.mak create mode 100644 hw/any/meson.build create mode 100644 target/any/Kconfig create mode 100644 target/any/cpu-param.h create mode 100644 target/any/cpu.h create mode 100644 target/any/meson.build -- 2.34.1
