s390x/cpumodel: default enable mepoch for z14 and later

Latest systems and host kernels support mepoch, which is a
feature that was meant to be supported for z14 GA1 from the
get-go. Let's copy it to the z14 GA1 default CPU model.

Machines s390-ccw-virtio-3.1 and older will retain the old CPU
models and will not provide this bit nor the extended PTFF
functions in the default model.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Message-Id: <20190212011657.18324-2-walling@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/s390-virtio-ccw.c

@@ -659,7 +659,8 @@ static void ccw_machine_3_1_instance_options(MachineState *machine)
 {
     static const S390FeatInit qemu_cpu_feat = { S390_FEAT_LIST_QEMU_V3_1 };
     ccw_machine_4_0_instance_options(machine);
-
+    s390_cpudef_featoff_greater(14, 1, S390_FEAT_MULTIPLE_EPOCH);
+    s390_cpudef_group_featoff_greater(14, 1, S390_FEAT_GROUP_MULTIPLE_EPOCH_PTFF);
     s390_set_qemu_cpu_model(0x2827, 12, 2, qemu_cpu_feat);
 }
 

target/s390x/cpu_models.c

@@ -117,6 +117,30 @@ void s390_cpudef_featoff_greater(uint8_t gen, uint8_t ec_ga, S390Feat feat)
     }
 }
 
+void s390_cpudef_group_featoff_greater(uint8_t gen, uint8_t ec_ga,
+                                       S390FeatGroup group)
+{
+    const S390FeatGroupDef *group_def = s390_feat_group_def(group);
+    S390FeatBitmap group_def_off;
+    int i;
+
+    bitmap_complement(group_def_off, group_def->feat, S390_FEAT_MAX);
+
+    for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
+        const S390CPUDef *cpu_def = &s390_cpu_defs[i];
+
+        if (cpu_def->gen < gen) {
+            continue;
+        }
+        if (cpu_def->gen == gen && cpu_def->ec_ga < ec_ga) {
+            continue;
+        }
+
+        bitmap_and((unsigned long *)&cpu_def->default_feat,
+                   cpu_def->default_feat, group_def_off, S390_FEAT_MAX);
+    }
+}
+
 uint32_t s390_get_hmfai(void)
 {
     static S390CPU *cpu;

target/s390x/cpu_models.h

@@ -75,6 +75,8 @@ struct S390CPUModel {
 
 void s390_cpudef_featoff(uint8_t gen, uint8_t ec_ga, S390Feat feat);
 void s390_cpudef_featoff_greater(uint8_t gen, uint8_t ec_ga, S390Feat feat);
+void s390_cpudef_group_featoff_greater(uint8_t gen, uint8_t ec_ga,
+                                       S390FeatGroup group);
 uint32_t s390_get_hmfai(void);
 uint8_t s390_get_mha_pow(void);
 uint32_t s390_get_ibc_val(void);

target/s390x/gen-features.c

@@ -550,6 +550,8 @@ static uint16_t default_GEN14_GA1[] = {
     S390_FEAT_GROUP_MSA_EXT_6,
     S390_FEAT_GROUP_MSA_EXT_7,
     S390_FEAT_GROUP_MSA_EXT_8,
+    S390_FEAT_MULTIPLE_EPOCH,
+    S390_FEAT_GROUP_MULTIPLE_EPOCH_PTFF,
 };
 
 /* QEMU (CPU model) features */