[GIT PULL 23/42] s390: Add attestation query information

Claudio Imbrenda
2022-07-21T16:13:34Z

From: Steffen Eiden <seiden@linux.ibm.com>

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@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/lkml/20220601100245.3189993-1-seiden@linux.ibm.com/
Signed-off-by: Janosch Frank <frankja@linux.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,
};

--
2.36.1