Re: [Qemu-devel] [RFC 25/38] cpu: add barriers around cpu->tcg_exit_req

[Paolo Bonzini]

On 23/08/2015 17:23, Emilio G. Cota wrote:
> @@ -16,6 +16,7 @@ static inline void gen_tb_start(TranslationBlock *tb)
>  
>      exitreq_label = gen_new_label();
>      flag = tcg_temp_new_i32();
> +    tcg_gen_smp_rmb();
>      tcg_gen_ld_i32(flag, cpu_env,
>                     offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
>      tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);

This can also be done in cpu-exec.c.  I have addressed Richard
Henderson's comments on the "signal-free TCG exit" patches and will
resend them asap.

Paolo