Re: [PATCH for-8.0 5/7] target/riscv: Use QEMU_IOTHREAD_LOCK_GUARD in riscv_cpu_update_mip

[Alistair Francis]

On Fri, Nov 18, 2022 at 7:22 PM Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
> Cc: Alistair Francis <alistair.francis@wdc.com>
> Cc: Bin Meng <bin.meng@windriver.com>
> Cc: qemu-riscv@nongnu.org
> ---
>  target/riscv/cpu_helper.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index 278d163803..241d06bab8 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -610,7 +610,6 @@ uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t 
> mask, uint64_t value)
>      CPURISCVState *env = &cpu->env;
>      CPUState *cs = CPU(cpu);
>      uint64_t gein, vsgein = 0, vstip = 0, old = env->mip;
> -    bool locked = false;
>
>      if (riscv_cpu_virt_enabled(env)) {
>          gein = get_field(env->hstatus, HSTATUS_VGEIN);
> @@ -621,10 +620,7 @@ uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t 
> mask, uint64_t value)
>      mask = ((mask == MIP_VSTIP) && env->vstime_irq) ? 0 : mask;
>      vstip = env->vstime_irq ? MIP_VSTIP : 0;
>
> -    if (!qemu_mutex_iothread_locked()) {
> -        locked = true;
> -        qemu_mutex_lock_iothread();
> -    }
> +    QEMU_IOTHREAD_LOCK_GUARD();
>
>      env->mip = (env->mip & ~mask) | (value & mask);
>
> @@ -634,10 +630,6 @@ uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t 
> mask, uint64_t value)
>          cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
>      }
>
> -    if (locked) {
> -        qemu_mutex_unlock_iothread();
> -    }
> -
>      return old;
>  }
>
> --
> 2.34.1
>
>