[Qemu-devel] [Patch v1 07/29] s390x/cpumodel: introduce CPU feature group definitions

[David Hildenbrand <dahi@linux.vnet.ibm.com>]

Let's use the generated groups to create feature group representations for
the user. These groups can later be used to enable/disable multiple
features in one shot and will be used to reduce the amount of reported
features to the user if all subfeatures are in place.

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
---
 target-s390x/cpu_features.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
 target-s390x/cpu_features.h | 23 +++++++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/target-s390x/cpu_features.c b/target-s390x/cpu_features.c
index 5aa5981..a8ca9ca 100644
--- a/target-s390x/cpu_features.c
+++ b/target-s390x/cpu_features.c
@@ -12,6 +12,7 @@
 
 #include "qemu/osdep.h"
 #include "cpu_features.h"
+#include "gen-features.h"
 
 #define FEAT_INIT(_name, _type, _bit, _desc) \
     {                                                \
@@ -321,14 +322,55 @@ void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
     }
 }
 
-void s390_feat_bitmap_to_ascii(const S390FeatBitmap bitmap, void *opaque,
+void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
                                void (*fn)(const char *name, void *opaque))
 {
+    S390FeatBitmap bitmap, tmp;
+    S390FeatGroup group;
     S390Feat feat;
 
+    bitmap_copy(bitmap, features, S390_FEAT_MAX);
+
+    /* process whole groups first */
+    for (group = 0; group < S390_FEAT_GROUP_MAX; group++) {
+        const S390FeatGroupDef *def = s390_feat_group_def(group);
+
+        bitmap_and(tmp, bitmap, def->feat, S390_FEAT_MAX);
+        if (bitmap_equal(tmp, def->feat, S390_FEAT_MAX)) {
+            bitmap_andnot(bitmap, bitmap, def->feat, S390_FEAT_MAX);
+            fn(def->name, opaque);
+        }
+    }
+
+    /* report leftovers as separate features */
     feat = find_first_bit(bitmap, S390_FEAT_MAX);
     while (feat < S390_FEAT_MAX) {
         fn(s390_feat_def(feat)->name, opaque);
         feat = find_next_bit(bitmap, S390_FEAT_MAX, feat + 1);
     };
 }
+
+#define FEAT_GROUP_INIT(_name, _group, _desc)        \
+    {                                                \
+        .name = _name,                               \
+        .desc = _desc,                               \
+        .feat = { S390_FEAT_GROUP_LIST_ ## _group }, \
+    }
+
+/* indexed by feature group number for easy lookup */
+static const S390FeatGroupDef s390_feature_groups[] = {
+    FEAT_GROUP_INIT("plo", PLO, "Perform-locked-operation facility"),
+    FEAT_GROUP_INIT("tods", TOD_CLOCK_STEERING, "Tod-clock-steering facility"),
+    FEAT_GROUP_INIT("gen13ptff", GEN13_PTFF, "PTFF enhancements introduced with z13"),
+    FEAT_GROUP_INIT("msa", MSA, "Message-security-assist facility"),
+    FEAT_GROUP_INIT("msa1", MSA_EXT_1, "Message-security-assist-extension 1 facility"),
+    FEAT_GROUP_INIT("msa2", MSA_EXT_2, "Message-security-assist-extension 2 facility"),
+    FEAT_GROUP_INIT("msa3", MSA_EXT_3, "Message-security-assist-extension 3 facility"),
+    FEAT_GROUP_INIT("msa4", MSA_EXT_4, "Message-security-assist-extension 4 facility"),
+    FEAT_GROUP_INIT("msa5", MSA_EXT_5, "Message-security-assist-extension 5 facility"),
+};
+
+const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group)
+{
+    return &s390_feature_groups[group];
+}
diff --git a/target-s390x/cpu_features.h b/target-s390x/cpu_features.h
index 485446c..e40a636 100644
--- a/target-s390x/cpu_features.h
+++ b/target-s390x/cpu_features.h
@@ -273,6 +273,29 @@ void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
 void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
                                void (*fn)(const char *name, void *opaque));
 
+/* static groups that will never change */
+typedef enum {
+    S390_FEAT_GROUP_PLO,
+    S390_FEAT_GROUP_TOD_CLOCK_STEERING,
+    S390_FEAT_GROUP_GEN13_PTFF_ENH,
+    S390_FEAT_GROUP_MSA,
+    S390_FEAT_GROUP_MSA_EXT_1,
+    S390_FEAT_GROUP_MSA_EXT_2,
+    S390_FEAT_GROUP_MSA_EXT_3,
+    S390_FEAT_GROUP_MSA_EXT_4,
+    S390_FEAT_GROUP_MSA_EXT_5,
+    S390_FEAT_GROUP_MAX,
+} S390FeatGroup;
+
+/* Definition of a CPU feature group */
+typedef struct {
+    const char *name;       /* name exposed to the user */
+    const char *desc;       /* description exposed to the user */
+    S390FeatBitmap feat;    /* features contained in the group */
+} S390FeatGroupDef;
+
+const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group);
+
 #define BE_BIT_NR(BIT) (BIT ^ (BITS_PER_LONG - 1))
 #define BE_BIT(BIT) (1ULL < BE_BIT_NR(BIT))
 
-- 
2.6.6