Re: [Qemu-devel] [RFC v3 PATCH 10/14] tcg/tci: Add support for fence

[Sergey Fedorov <serge.fdrv@gmail.com>]

On 18/06/16 07:03, Pranith Kumar wrote:
> Cc: Stefan Weil <sw@weilnetz.de>
> Signed-off-by: Richard Henderson <rth@twiddle.net>
> Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
> ---
>  tcg/tci/tcg-target.inc.c | 3 +++
>  tci.c                    | 3 +++
>  2 files changed, 6 insertions(+)
>
> diff --git a/tcg/tci/tcg-target.inc.c b/tcg/tci/tcg-target.inc.c
> index fa74d52..8e950df 100644
> --- a/tcg/tci/tcg-target.inc.c
> +++ b/tcg/tci/tcg-target.inc.c
> @@ -255,6 +255,7 @@ static const TCGTargetOpDef tcg_target_op_defs[] = {
>      { INDEX_op_bswap32_i32, { R, R } },
>  #endif
>  
> +    { INDEX_op_mb, { } },
>      { -1 },
>  };
>  
> @@ -800,6 +801,8 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
>          }
>          tcg_out_i(s, *args++);
>          break;
> +    case INDEX_op_mb:
> +        break;
>      case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
>      case INDEX_op_mov_i64:
>      case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi.  */
> diff --git a/tci.c b/tci.c
> index b488c0d..4081e61 100644
> --- a/tci.c
> +++ b/tci.c
> @@ -1236,6 +1236,9 @@ uintptr_t tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr)
>                  tcg_abort();
>              }
>              break;
> +        case INDEX_op_mb:
> +            smp_mb();

I think we could distinguish smp_rmb(), smp_wmb() and smp_mb() here.

Kind regards,
Sergey

> +            break;
>          default:
>              TODO();
>              break;