Re: [Qemu-devel] [PATCH 3/4] target/i386/translate: use thread-local storage in !user-mode

[Paolo Bonzini <pbonzini@redhat.com>]

On 14/08/2018 03:38, Emilio G. Cota wrote:
> Needed for MTTCG.
> 
> Signed-off-by: Emilio G. Cota <cota@braap.org>

Why not always use TLS, even in user-mode?

Paolo

> ---
>  target/i386/translate.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/target/i386/translate.c b/target/i386/translate.c
> index 07d185e7b6..f4c2a41f8f 100644
> --- a/target/i386/translate.c
> +++ b/target/i386/translate.c
> @@ -71,26 +71,34 @@
>  
>  //#define MACRO_TEST   1
>  
> +/* we need thread-local storage for mttcg */
> +#ifdef CONFIG_USER_ONLY
> +#define I386_THREAD
> +#else
> +#define I386_THREAD __thread
> +#endif
> +
>  /* global register indexes */
> -static TCGv cpu_A0;
> -static TCGv cpu_cc_dst, cpu_cc_src, cpu_cc_src2, cpu_cc_srcT;
> +static TCGv cpu_cc_dst, cpu_cc_src, cpu_cc_src2;
>  static TCGv_i32 cpu_cc_op;
>  static TCGv cpu_regs[CPU_NB_REGS];
>  static TCGv cpu_seg_base[6];
>  static TCGv_i64 cpu_bndl[4];
>  static TCGv_i64 cpu_bndu[4];
>  /* local temps */
> -static TCGv cpu_T0, cpu_T1;
> +static I386_THREAD TCGv cpu_cc_srcT;
> +static I386_THREAD TCGv cpu_A0;
> +static I386_THREAD TCGv cpu_T0, cpu_T1;
>  /* local register indexes (only used inside old micro ops) */
> -static TCGv cpu_tmp0, cpu_tmp4;
> -static TCGv_ptr cpu_ptr0, cpu_ptr1;
> -static TCGv_i32 cpu_tmp2_i32, cpu_tmp3_i32;
> -static TCGv_i64 cpu_tmp1_i64;
> +static I386_THREAD TCGv cpu_tmp0, cpu_tmp4;
> +static I386_THREAD TCGv_ptr cpu_ptr0, cpu_ptr1;
> +static I386_THREAD TCGv_i32 cpu_tmp2_i32, cpu_tmp3_i32;
> +static I386_THREAD TCGv_i64 cpu_tmp1_i64;
>  
>  #include "exec/gen-icount.h"
>  
>  #ifdef TARGET_X86_64
> -static int x86_64_hregs;
> +static I386_THREAD int x86_64_hregs;
>  #endif
>  
>  typedef struct DisasContext {
>