[PATCH v5 01/10] s390x: Add SE hdr query information

From: Janosch Frank <frankja@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
	imbrenda@linux.ibm.com
Subject: [PATCH v5 01/10] s390x: Add SE hdr query information
Date: Mon, 16 May 2022 09:08:08 +0000	[thread overview]
Message-ID: <20220516090817.1110090-2-frankja@linux.ibm.com> (raw)
In-Reply-To: <20220516090817.1110090-1-frankja@linux.ibm.com>

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@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@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 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 cfea7b77a5b8..46498b8c587b 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -110,7 +110,10 @@ 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 */
@@ -307,6 +310,8 @@ 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,
 };
 
-- 
2.34.1

