linux-kernel - Re: [PATCH v2 1/1] s390: Add attestation query information

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Date:   Tue, 24 May 2022 16:55:15 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Steffen Eiden <seiden@...ux.ibm.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Nico Boehr <nrb@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] s390: Add attestation query information

On Wed, 18 May 2022 13:59:08 +0000
Steffen Eiden <seiden@...ux.ibm.com> wrote:

> We have information about the supported attestation header version
> and plaintext attestation flag bits.
> Let's expose it via the sysfs files.
> 
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>

when you have fixed the commit message as indicated by Heiko:

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> ---
>  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 67c737c1e580..a5fa667160b2 100644
> --- a/arch/s390/boot/uv.c
> +++ b/arch/s390/boot/uv.c
> @@ -45,6 +45,8 @@ void uv_query_info(void)
>  		uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
>  		uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
>  		uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
> +		uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver;
> +		uv_info.supp_att_pflags = uvcb.supp_att_pflags;
>  	}
>  
>  #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> index 3e597bb634bd..18fe04c8547e 100644
> --- a/arch/s390/include/asm/uv.h
> +++ b/arch/s390/include/asm/uv.h
> @@ -124,7 +124,10 @@ struct uv_cb_qui {
>  	u64 reservedc0;				/* 0x00c0 */
>  	u64 conf_dump_storage_state_len;	/* 0x00c8 */
>  	u64 conf_dump_finalize_len;		/* 0x00d0 */
> -	u8  reservedd8[256 - 216];		/* 0x00d8 */
> +	u64 reservedd8;				/* 0x00d8 */
> +	u64 supp_att_req_hdr_ver;		/* 0x00e0 */
> +	u64 supp_att_pflags;			/* 0x00e8 */
> +	u8 reservedf0[256 - 240];		/* 0x00f0 */
>  } __packed __aligned(8);
>  
>  /* Initialize Ultravisor */
> @@ -350,6 +353,8 @@ struct uv_info {
>  	unsigned long supp_se_hdr_pcf;
>  	unsigned long conf_dump_storage_state_len;
>  	unsigned long conf_dump_finalize_len;
> +	unsigned long supp_att_req_hdr_ver;
> +	unsigned long supp_att_pflags;
>  };
>  
>  extern struct uv_info uv_info;
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index 84fe33b6af4d..c13d5a7b71f0 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -479,6 +479,24 @@ static ssize_t uv_query_max_guest_addr(struct kobject *kobj,
>  static struct kobj_attribute uv_query_max_guest_addr_attr =
>  	__ATTR(max_address, 0444, uv_query_max_guest_addr, NULL);
>  
> +static ssize_t uv_query_supp_att_req_hdr_ver(struct kobject *kobj,
> +					     struct kobj_attribute *attr, char *page)
> +{
> +	return scnprintf(page, PAGE_SIZE, "%lx\n", uv_info.supp_att_req_hdr_ver);
> +}
> +
> +static struct kobj_attribute uv_query_supp_att_req_hdr_ver_attr =
> +	__ATTR(supp_att_req_hdr_ver, 0444, uv_query_supp_att_req_hdr_ver, NULL);
> +
> +static ssize_t uv_query_supp_att_pflags(struct kobject *kobj,
> +					struct kobj_attribute *attr, char *page)
> +{
> +	return scnprintf(page, PAGE_SIZE, "%lx\n", uv_info.supp_att_pflags);
> +}
> +
> +static struct kobj_attribute uv_query_supp_att_pflags_attr =
> +	__ATTR(supp_att_pflags, 0444, uv_query_supp_att_pflags, NULL);
> +
>  static struct attribute *uv_query_attrs[] = {
>  	&uv_query_facilities_attr.attr,
>  	&uv_query_feature_indications_attr.attr,
> @@ -490,6 +508,8 @@ static struct attribute *uv_query_attrs[] = {
>  	&uv_query_dump_storage_state_len_attr.attr,
>  	&uv_query_dump_finalize_len_attr.attr,
>  	&uv_query_dump_cpu_len_attr.attr,
> +	&uv_query_supp_att_req_hdr_ver_attr.attr,
> +	&uv_query_supp_att_pflags_attr.attr,
>  	NULL,
>  };
>