Re: [PATCH 1/9] s390x: Add SE hdr query information

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On Wed, 23 Feb 2022 09:19:59 +0000
Janosch Frank <frankja@xxxxxxxxxxxxx> wrote:

> We have information about the supported se header version and pcf bits
> so let's expose it via the sysfs files.
> 
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>

Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>

> ---
>  arch/s390/boot/uv.c        |  2 ++
>  arch/s390/include/asm/uv.h |  7 ++++++-
>  arch/s390/kernel/uv.c      | 20 ++++++++++++++++++++
>  3 files changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c
> index e6be155ab2e5..b100b57cf15d 100644
> --- a/arch/s390/boot/uv.c
> +++ b/arch/s390/boot/uv.c
> @@ -41,6 +41,8 @@ void uv_query_info(void)
>  		uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
>  		uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
>  		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
> +		uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
> +		uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
>  	}
>  
>  #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> index 86218382d29c..7d6c78b61bf2 100644
> --- a/arch/s390/include/asm/uv.h
> +++ b/arch/s390/include/asm/uv.h
> @@ -107,7 +107,10 @@ struct uv_cb_qui {
>  	u8  reserved88[158 - 136];		/* 0x0088 */
>  	u16 max_guest_cpu_id;			/* 0x009e */
>  	u64 uv_feature_indications;		/* 0x00a0 */
> -	u8  reserveda8[200 - 168];		/* 0x00a8 */
> +	u64 reserveda8;				/* 0x00a8 */
> +	u64 supp_se_hdr_versions;		/* 0x00b0 */
> +	u64 supp_se_hdr_pcf;			/* 0x00b8 */
> +	u64 reservedc0;				/* 0x00c0 */
>  } __packed __aligned(8);
>  
>  /* Initialize Ultravisor */
> @@ -285,6 +288,8 @@ struct uv_info {
>  	unsigned int max_num_sec_conf;
>  	unsigned short max_guest_cpu_id;
>  	unsigned long uv_feature_indications;
> +	unsigned long supp_se_hdr_ver;
> +	unsigned long supp_se_hdr_pcf;
>  };
>  
>  extern struct uv_info uv_info;
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index a5425075dd25..852840384e75 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -392,6 +392,24 @@ static ssize_t uv_query_facilities(struct kobject *kobj,
>  static struct kobj_attribute uv_query_facilities_attr =
>  	__ATTR(facilities, 0444, uv_query_facilities, NULL);
>  
> +static ssize_t uv_query_supp_se_hdr_ver(struct kobject *kobj,
> +					struct kobj_attribute *attr, char *buf)
> +{
> +	return sysfs_emit(buf, "%lx\n", uv_info.supp_se_hdr_ver);
> +}
> +
> +static struct kobj_attribute uv_query_supp_se_hdr_ver_attr =
> +	__ATTR(supp_se_hdr_ver, 0444, uv_query_supp_se_hdr_ver, NULL);
> +
> +static ssize_t uv_query_supp_se_hdr_pcf(struct kobject *kobj,
> +					struct kobj_attribute *attr, char *buf)
> +{
> +	return sysfs_emit(buf, "%lx\n", uv_info.supp_se_hdr_pcf);
> +}
> +
> +static struct kobj_attribute uv_query_supp_se_hdr_pcf_attr =
> +	__ATTR(supp_se_hdr_pcf, 0444, uv_query_supp_se_hdr_pcf, NULL);
> +
>  static ssize_t uv_query_feature_indications(struct kobject *kobj,
>  					    struct kobj_attribute *attr, char *buf)
>  {
> @@ -437,6 +455,8 @@ static struct attribute *uv_query_attrs[] = {
>  	&uv_query_max_guest_cpus_attr.attr,
>  	&uv_query_max_guest_vms_attr.attr,
>  	&uv_query_max_guest_addr_attr.attr,
> +	&uv_query_supp_se_hdr_ver_attr.attr,
> +	&uv_query_supp_se_hdr_pcf_attr.attr,
>  	NULL,
>  };
>  




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