Re: [kvm-unit-tests PATCH 2/3] s390x: lib: SOP facility query function

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On Fri, 20 May 2022 21:08:49 +0200
Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx> wrote:

> Add function returning which suppression-on-protection facility is
> installed.
> 
> Signed-off-by: Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx>

Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>

> ---
>  lib/s390x/asm/facility.h | 21 +++++++++++++++++++++
>  lib/s390x/sclp.h         |  4 ++++
>  lib/s390x/sclp.c         |  2 ++
>  3 files changed, 27 insertions(+)
> 
> diff --git a/lib/s390x/asm/facility.h b/lib/s390x/asm/facility.h
> index 49380203..a66fe56a 100644
> --- a/lib/s390x/asm/facility.h
> +++ b/lib/s390x/asm/facility.h
> @@ -12,6 +12,7 @@
>  #include <asm/facility.h>
>  #include <asm/arch_def.h>
>  #include <bitops.h>
> +#include <sclp.h>
>  
>  #define NB_STFL_DOUBLEWORDS 32
>  extern uint64_t stfl_doublewords[];
> @@ -42,4 +43,24 @@ static inline void setup_facilities(void)
>  		stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS);
>  }
>  
> +enum supp_on_prot_facility {
> +	SOP_NONE,
> +	SOP_BASIC,
> +	SOP_ENHANCED_1,
> +	SOP_ENHANCED_2,
> +};
> +
> +static inline enum supp_on_prot_facility get_supp_on_prot_facility(void)
> +{
> +	if (sclp_facilities.has_esop) {
> +		if (test_facility(131)) /* side-effect-access facility */
> +			return SOP_ENHANCED_2;
> +		else
> +			return SOP_ENHANCED_1;
> +	}
> +	if (sclp_facilities.has_sop)
> +		return SOP_BASIC;
> +	return SOP_NONE;
> +}
> +
>  #endif
> diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
> index 3488f4d2..853529bf 100644
> --- a/lib/s390x/sclp.h
> +++ b/lib/s390x/sclp.h
> @@ -123,7 +123,9 @@ struct sclp_facilities {
>  	uint64_t has_cei : 1;
>  
>  	uint64_t has_diag318 : 1;
> +	uint64_t has_sop : 1;
>  	uint64_t has_gsls : 1;
> +	uint64_t has_esop : 1;
>  	uint64_t has_cmma : 1;
>  	uint64_t has_64bscao : 1;
>  	uint64_t has_esca : 1;
> @@ -134,7 +136,9 @@ struct sclp_facilities {
>  };
>  
>  /* bit number within a certain byte */
> +#define SCLP_FEAT_80_BIT_SOP		2
>  #define SCLP_FEAT_85_BIT_GSLS		0
> +#define SCLP_FEAT_85_BIT_ESOP		6
>  #define SCLP_FEAT_98_BIT_KSS		7
>  #define SCLP_FEAT_116_BIT_64BSCAO	0
>  #define SCLP_FEAT_116_BIT_CMMA		1
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> index b8204c5f..e6017f64 100644
> --- a/lib/s390x/sclp.c
> +++ b/lib/s390x/sclp.c
> @@ -152,7 +152,9 @@ void sclp_facilities_setup(void)
>  	cpu = sclp_get_cpu_entries();
>  	if (read_info->offset_cpu > 134)
>  		sclp_facilities.has_diag318 = read_info->byte_134_diag318;
> +	sclp_facilities.has_sop = sclp_feat_check(80, SCLP_FEAT_80_BIT_SOP);
>  	sclp_facilities.has_gsls = sclp_feat_check(85, SCLP_FEAT_85_BIT_GSLS);
> +	sclp_facilities.has_esop = sclp_feat_check(85, SCLP_FEAT_85_BIT_ESOP);
>  	sclp_facilities.has_kss = sclp_feat_check(98, SCLP_FEAT_98_BIT_KSS);
>  	sclp_facilities.has_cmma = sclp_feat_check(116, SCLP_FEAT_116_BIT_CMMA);
>  	sclp_facilities.has_64bscao = sclp_feat_check(116, SCLP_FEAT_116_BIT_64BSCAO);




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