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[0/3] cpu_exec_halt: make method mandatory

Message ID 20240603160933.1141717-1-peter.maydell@linaro.org
Headers show
Series cpu_exec_halt: make method mandatory | expand

Message

Peter Maydell June 3, 2024, 4:09 p.m. UTC 
This patchset makes the TCGCPUOps::cpu_exec_halt method
mandatory, which is a cleanup that RTH asked for when we
were discussing my FEAT_WFxT series.

I'm not 100% convinced about this, because if we ever find we
need to change the cpu_exec_halt method so it's no longer the
exact same function signature as the has_work method then
we'll have to undo this change. But I don't feel very strongly
about it, and it does mean we can skip a runtime check for
whether the method exists.

We probably want patch 1 anyway; I didn't notice at the
time that M-profile has its own TCGCPUOps, and it's less
confusing if A and M both use the same arm_cpu_exec_halt().
(This isn't a bug in the FEAT_WFxT commit, though -- the
behaviour is the same.)

thanks
-- PMM

Peter Maydell (3):
  target/arm: Set arm_v7m_tcg_ops cpu_exec_halt to arm_cpu_exec_halt()
  target: Set TCGCPUOps::cpu_exec_halt to target's has_work
    implementation
  accel/tcg: Make TCGCPUOps::cpu_exec_halt mandatory

 include/hw/core/tcg-cpu-ops.h | 9 ++++++---
 target/arm/internals.h        | 3 +++
 target/riscv/internals.h      | 3 +++
 accel/tcg/cpu-exec.c          | 7 +------
 target/alpha/cpu.c            | 1 +
 target/arm/cpu.c              | 2 +-
 target/arm/tcg/cpu-v7m.c      | 1 +
 target/avr/cpu.c              | 1 +
 target/cris/cpu.c             | 2 ++
 target/hppa/cpu.c             | 1 +
 target/loongarch/cpu.c        | 1 +
 target/m68k/cpu.c             | 1 +
 target/microblaze/cpu.c       | 1 +
 target/mips/cpu.c             | 1 +
 target/openrisc/cpu.c         | 1 +
 target/ppc/cpu_init.c         | 2 ++
 target/riscv/cpu.c            | 2 +-
 target/riscv/tcg/tcg-cpu.c    | 2 ++
 target/rx/cpu.c               | 1 +
 target/s390x/cpu.c            | 1 +
 target/sh4/cpu.c              | 1 +
 target/sparc/cpu.c            | 1 +
 target/xtensa/cpu.c           | 1 +
 23 files changed, 35 insertions(+), 11 deletions(-)

Comments

Richard Henderson June 4, 2024, 1:03 a.m. UTC | #1 
On 6/3/24 11:09, Peter Maydell wrote:
> Peter Maydell (3):
>    target/arm: Set arm_v7m_tcg_ops cpu_exec_halt to arm_cpu_exec_halt()
>    target: Set TCGCPUOps::cpu_exec_halt to target's has_work
>      implementation
>    accel/tcg: Make TCGCPUOps::cpu_exec_halt mandatory

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~