[kvm-unit-tests PATCH v2 2/3] s390x: lib: SOP facility query function

[Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx>]

Add function returning which suppression-on-protection facility is
installed.

Signed-off-by: Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
 lib/s390x/asm/facility.h | 21 +++++++++++++++++++++
 lib/s390x/sclp.h         |  4 ++++
 lib/s390x/sclp.c         |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/lib/s390x/asm/facility.h b/lib/s390x/asm/facility.h
index 49380203..a66fe56a 100644
--- a/lib/s390x/asm/facility.h
+++ b/lib/s390x/asm/facility.h
@@ -12,6 +12,7 @@
 #include <asm/facility.h>
 #include <asm/arch_def.h>
 #include <bitops.h>
+#include <sclp.h>
 
 #define NB_STFL_DOUBLEWORDS 32
 extern uint64_t stfl_doublewords[];
@@ -42,4 +43,24 @@ static inline void setup_facilities(void)
 		stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS);
 }
 
+enum supp_on_prot_facility {
+	SOP_NONE,
+	SOP_BASIC,
+	SOP_ENHANCED_1,
+	SOP_ENHANCED_2,
+};
+
+static inline enum supp_on_prot_facility get_supp_on_prot_facility(void)
+{
+	if (sclp_facilities.has_esop) {
+		if (test_facility(131)) /* side-effect-access facility */
+			return SOP_ENHANCED_2;
+		else
+			return SOP_ENHANCED_1;
+	}
+	if (sclp_facilities.has_sop)
+		return SOP_BASIC;
+	return SOP_NONE;
+}
+
 #endif
diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
index 3488f4d2..853529bf 100644
--- a/lib/s390x/sclp.h
+++ b/lib/s390x/sclp.h
@@ -123,7 +123,9 @@ struct sclp_facilities {
 	uint64_t has_cei : 1;
 
 	uint64_t has_diag318 : 1;
+	uint64_t has_sop : 1;
 	uint64_t has_gsls : 1;
+	uint64_t has_esop : 1;
 	uint64_t has_cmma : 1;
 	uint64_t has_64bscao : 1;
 	uint64_t has_esca : 1;
@@ -134,7 +136,9 @@ struct sclp_facilities {
 };
 
 /* bit number within a certain byte */
+#define SCLP_FEAT_80_BIT_SOP		2
 #define SCLP_FEAT_85_BIT_GSLS		0
+#define SCLP_FEAT_85_BIT_ESOP		6
 #define SCLP_FEAT_98_BIT_KSS		7
 #define SCLP_FEAT_116_BIT_64BSCAO	0
 #define SCLP_FEAT_116_BIT_CMMA		1
diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
index b8204c5f..e6017f64 100644
--- a/lib/s390x/sclp.c
+++ b/lib/s390x/sclp.c
@@ -152,7 +152,9 @@ void sclp_facilities_setup(void)
 	cpu = sclp_get_cpu_entries();
 	if (read_info->offset_cpu > 134)
 		sclp_facilities.has_diag318 = read_info->byte_134_diag318;
+	sclp_facilities.has_sop = sclp_feat_check(80, SCLP_FEAT_80_BIT_SOP);
 	sclp_facilities.has_gsls = sclp_feat_check(85, SCLP_FEAT_85_BIT_GSLS);
+	sclp_facilities.has_esop = sclp_feat_check(85, SCLP_FEAT_85_BIT_ESOP);
 	sclp_facilities.has_kss = sclp_feat_check(98, SCLP_FEAT_98_BIT_KSS);
 	sclp_facilities.has_cmma = sclp_feat_check(116, SCLP_FEAT_116_BIT_CMMA);
 	sclp_facilities.has_64bscao = sclp_feat_check(116, SCLP_FEAT_116_BIT_64BSCAO);
-- 
2.33.1