Re: [kvm-unit-tests PATCH v2 2/3] lib: s390x: sclp: Extend feature probing

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On 19.05.21 10:26, Janosch Frank wrote:
Lets grab more of the feature bits from SCLP read info so we can use
them in the cpumodel tests.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
  lib/s390x/sclp.c | 20 ++++++++++++++++++++
  lib/s390x/sclp.h | 38 +++++++++++++++++++++++++++++++++++---
  2 files changed, 55 insertions(+), 3 deletions(-)

diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
index f11c2035..291924b0 100644
--- a/lib/s390x/sclp.c
+++ b/lib/s390x/sclp.c
@@ -129,6 +129,13 @@ CPUEntry *sclp_get_cpu_entries(void)
  	return (CPUEntry *)(_read_info + read_info->offset_cpu);
  }
+static bool sclp_feat_check(int byte, int bit)
+{
+	uint8_t *rib = (uint8_t *)read_info;
+
+	return !!(rib[byte] & (0x80 >> bit));
+}
+
  void sclp_facilities_setup(void)
  {
  	unsigned short cpu0_addr = stap();
@@ -140,6 +147,14 @@ 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_gsls = sclp_feat_check(85, SCLP_FEAT_85_BIT_GSLS);
+	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);
+	sclp_facilities.has_esca = sclp_feat_check(116, SCLP_FEAT_116_BIT_ESCA);
+	sclp_facilities.has_ibs = sclp_feat_check(117, SCLP_FEAT_117_BIT_IBS);
+	sclp_facilities.has_pfmfi = sclp_feat_check(117, SCLP_FEAT_117_BIT_PFMFI);
+
  	for (i = 0; i < read_info->entries_cpu; i++, cpu++) {
  		/*
  		 * The logic for only reading the facilities from the
@@ -150,6 +165,11 @@ void sclp_facilities_setup(void)
  		 */
  		if (cpu->address == cpu0_addr) {
  			sclp_facilities.has_sief2 = cpu->feat_sief2;
+			sclp_facilities.has_skeyi = cpu->feat_skeyi;
+			sclp_facilities.has_siif = cpu->feat_siif;
+			sclp_facilities.has_sigpif = cpu->feat_sigpif;
+			sclp_facilities.has_ib = cpu->feat_ib;
+			sclp_facilities.has_cei = cpu->feat_cei;
  			break;
  		}
  	}
diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
index 85231333..115bd2fa 100644
--- a/lib/s390x/sclp.h
+++ b/lib/s390x/sclp.h
@@ -94,9 +94,19 @@ typedef struct CPUEntry {
  	uint8_t reserved0;
  	uint8_t : 4;
  	uint8_t feat_sief2 : 1;
+	uint8_t feat_skeyi : 1;
+	uint8_t : 2;
+	uint8_t : 2;
+	uint8_t feat_gpere : 1;
+	uint8_t feat_siif : 1;
+	uint8_t feat_sigpif : 1;
  	uint8_t : 3;
-	uint8_t features_res2 [SCCB_CPU_FEATURE_LEN - 1];
-	uint8_t reserved2[6];
+	uint8_t reserved2[3];
+	uint8_t : 2;
+	uint8_t feat_ib : 1;
+	uint8_t feat_cei : 1;
+	uint8_t : 4;
+	uint8_t reserved3[6];
  	uint8_t type;
  	uint8_t reserved1;
  } __attribute__((packed)) CPUEntry;
@@ -105,10 +115,32 @@ extern struct sclp_facilities sclp_facilities;
struct sclp_facilities {
  	uint64_t has_sief2 : 1;
+	uint64_t has_skeyi : 1;
+	uint64_t has_gpere : 1;
+	uint64_t has_siif : 1;
+	uint64_t has_sigpif : 1;
+	uint64_t has_ib : 1;
+	uint64_t has_cei : 1;
+
  	uint64_t has_diag318 : 1;
-	uint64_t : 62;
+	uint64_t has_gsls : 1;
+	uint64_t has_cmma : 1;
+	uint64_t has_64bscao : 1;
+	uint64_t has_esca : 1;
+	uint64_t has_kss : 1;
+	uint64_t has_pfmfi : 1;
+	uint64_t has_ibs : 1;
+	uint64_t : 64 - 15;
  };
+#define SCLP_FEAT_85_BIT_GSLS 7
+#define SCLP_FEAT_98_BIT_KSS		0
+#define SCLP_FEAT_116_BIT_64BSCAO	7
+#define SCLP_FEAT_116_BIT_CMMA		6
+#define SCLP_FEAT_116_BIT_ESCA		3
+#define SCLP_FEAT_117_BIT_PFMFI		6
+#define SCLP_FEAT_117_BIT_IBS		5
+
  typedef struct ReadInfo {
  	SCCBHeader h;
  	uint16_t rnmax;


Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Thanks,

David / dhildenb




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