Commit 1b6abe95 authored by Steffen Eiden's avatar Steffen Eiden Committed by Janosch Frank
Browse files

s390: Add attestation query information 



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: default avatarSteffen Eiden <seiden@linux.ibm.com>
Reviewed-by: default avatarClaudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: default avatarJanosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/lkml/20220601100245.3189993-1-seiden@linux.ibm.com/


Signed-off-by: default avatarJanosch Frank <frankja@linux.ibm.com>
parent b9df116c

arch/s390/boot/uv.c

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/include/asm/uv.h

+6 −1
Original line number Diff line number Diff line
@@ -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;

arch/s390/kernel/uv.c

+20 −0
Original line number Diff line number Diff line
@@ -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,

};