target/s390x/cpu_features.c

   1 /*
   2  * CPU features/facilities for s390x
   3  *
   4  * Copyright IBM Corp. 2016, 2018
   5  * Copyright Red Hat, Inc. 2019
   6  *
   7  * Author(s): David Hildenbrand <david@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or (at
  10  * your option) any later version. See the COPYING file in the top-level
  11  * directory.
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qemu/module.h"
  16 #include "cpu_features.h"
  17 #ifndef CONFIG_USER_ONLY
  18 #include "target/s390x/kvm/pv.h"
  19 #endif
  20
  21 #define DEF_FEAT(_FEAT, _NAME, _TYPE, _BIT, _DESC) \
  22     [S390_FEAT_##_FEAT] = {                        \
  23         .name = _NAME,                             \
  24         .type = S390_FEAT_TYPE_##_TYPE,            \
  25         .bit = _BIT,                               \
  26         .desc = _DESC,                             \
  27     },
  28 static const S390FeatDef s390_features[S390_FEAT_MAX] = {
  29     #include "cpu_features_def.h.inc"
  30 };
  31 #undef DEF_FEAT
  32
  33 const S390FeatDef *s390_feat_def(S390Feat feat)
  34 {
  35     return &s390_features[feat];
  36 }
  37
  38 S390Feat s390_feat_by_type_and_bit(S390FeatType type, int bit)
  39 {
  40     S390Feat feat;
  41
  42     for (feat = 0; feat < ARRAY_SIZE(s390_features); feat++) {
  43         if (s390_features[feat].type == type &&
  44             s390_features[feat].bit == bit) {
  45             return feat;
  46         }
  47     }
  48     return S390_FEAT_MAX;
  49 }
  50
  51 void s390_init_feat_bitmap(const S390FeatInit init, S390FeatBitmap bitmap)
  52 {
  53     int i, j;
  54
  55     for (i = 0; i < (S390_FEAT_MAX / 64 + 1); i++) {
  56         if (init[i]) {
  57             for (j = 0; j < 64; j++) {
  58                 if (init[i] & 1ULL << j) {
  59                     set_bit(i * 64 + j, bitmap);
  60                 }
  61             }
  62         }
  63     }
  64 }
  65
  66 void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
  67                           uint8_t *data)
  68 {
  69     S390Feat feat;
  70     int bit_nr;
  71
  72     switch (type) {
  73     case S390_FEAT_TYPE_STFL:
  74         if (test_bit(S390_FEAT_ZARCH, features)) {
  75             /* Features that are always active */
  76             set_be_bit(2, data);   /* z/Architecture */
  77             set_be_bit(138, data); /* Configuration-z-architectural-mode */
  78         }
  79         break;
  80     case S390_FEAT_TYPE_PTFF:
  81     case S390_FEAT_TYPE_KMAC:
  82     case S390_FEAT_TYPE_KMC:
  83     case S390_FEAT_TYPE_KM:
  84     case S390_FEAT_TYPE_KIMD:
  85     case S390_FEAT_TYPE_KLMD:
  86     case S390_FEAT_TYPE_PCKMO:
  87     case S390_FEAT_TYPE_KMCTR:
  88     case S390_FEAT_TYPE_KMF:
  89     case S390_FEAT_TYPE_KMO:
  90     case S390_FEAT_TYPE_PCC:
  91     case S390_FEAT_TYPE_PPNO:
  92     case S390_FEAT_TYPE_KMA:
  93     case S390_FEAT_TYPE_KDSA:
  94     case S390_FEAT_TYPE_SORTL:
  95     case S390_FEAT_TYPE_DFLTCC:
  96         set_be_bit(0, data); /* query is always available */
  97         break;
  98     default:
  99         break;
 100     };
 101
 102     feat = find_first_bit(features, S390_FEAT_MAX);
 103     while (feat < S390_FEAT_MAX) {
 104         if (s390_features[feat].type == type) {
 105             bit_nr = s390_features[feat].bit;
 106             /* big endian on uint8_t array */
 107             set_be_bit(bit_nr, data);
 108         }
 109         feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
 110     }
 111
 112 #ifndef CONFIG_USER_ONLY
 113     if (!s390_is_pv()) {
 114         return;
 115     }
 116
 117     /*
 118      * Some facilities are not available for CPUs in protected mode:
 119      * - All SIE facilities because SIE is not available
 120      * - DIAG318
 121      *
 122      * As VMs can move in and out of protected mode the CPU model
 123      * doesn't protect us from that problem because it is only
 124      * validated at the start of the VM.
 125      */
 126     switch (type) {
 127     case S390_FEAT_TYPE_SCLP_CPU:
 128         clear_be_bit(s390_feat_def(S390_FEAT_SIE_F2)->bit, data);
 129         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SKEY)->bit, data);
 130         clear_be_bit(s390_feat_def(S390_FEAT_SIE_GPERE)->bit, data);
 131         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIIF)->bit, data);
 132         clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIGPIF)->bit, data);
 133         clear_be_bit(s390_feat_def(S390_FEAT_SIE_IB)->bit, data);
 134         clear_be_bit(s390_feat_def(S390_FEAT_SIE_CEI)->bit, data);
 135         break;
 136     case S390_FEAT_TYPE_SCLP_CONF_CHAR:
 137         clear_be_bit(s390_feat_def(S390_FEAT_SIE_GSLS)->bit, data);
 138         clear_be_bit(s390_feat_def(S390_FEAT_HPMA2)->bit, data);
 139         clear_be_bit(s390_feat_def(S390_FEAT_SIE_KSS)->bit, data);
 140         break;
 141     case S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT:
 142         clear_be_bit(s390_feat_def(S390_FEAT_SIE_64BSCAO)->bit, data);
 143         clear_be_bit(s390_feat_def(S390_FEAT_SIE_CMMA)->bit, data);
 144         clear_be_bit(s390_feat_def(S390_FEAT_SIE_PFMFI)->bit, data);
 145         clear_be_bit(s390_feat_def(S390_FEAT_SIE_IBS)->bit, data);
 146         break;
 147     case S390_FEAT_TYPE_SCLP_FAC134:
 148         clear_be_bit(s390_feat_def(S390_FEAT_DIAG_318)->bit, data);
 149         break;
 150     default:
 151         return;
 152     }
 153 #endif
 154 }
 155
 156 void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
 157                               uint8_t *data)
 158 {
 159     int nr_bits, le_bit;
 160
 161     switch (type) {
 162     case S390_FEAT_TYPE_STFL:
 163        nr_bits = 16384;
 164        break;
 165     case S390_FEAT_TYPE_PLO:
 166     case S390_FEAT_TYPE_SORTL:
 167     case S390_FEAT_TYPE_DFLTCC:
 168        nr_bits = 256;
 169        break;
 170     default:
 171        /* all cpu subfunctions have 128 bit */
 172        nr_bits = 128;
 173     };
 174
 175     le_bit = find_first_bit((unsigned long *) data, nr_bits);
 176     while (le_bit < nr_bits) {
 177         /* convert the bit number to a big endian bit nr */
 178         S390Feat feat = s390_feat_by_type_and_bit(type, BE_BIT_NR(le_bit));
 179         /* ignore unknown bits */
 180         if (feat < S390_FEAT_MAX) {
 181             set_bit(feat, features);
 182         }
 183         le_bit = find_next_bit((unsigned long *) data, nr_bits, le_bit + 1);
 184     }
 185 }
 186
 187 void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
 188                                void (*fn)(const char *name, void *opaque))
 189 {
 190     S390FeatBitmap bitmap, tmp;
 191     S390FeatGroup group;
 192     S390Feat feat;
 193
 194     bitmap_copy(bitmap, features, S390_FEAT_MAX);
 195
 196     /* process whole groups first */
 197     for (group = 0; group < S390_FEAT_GROUP_MAX; group++) {
 198         const S390FeatGroupDef *def = s390_feat_group_def(group);
 199
 200         bitmap_and(tmp, bitmap, def->feat, S390_FEAT_MAX);
 201         if (bitmap_equal(tmp, def->feat, S390_FEAT_MAX)) {
 202             bitmap_andnot(bitmap, bitmap, def->feat, S390_FEAT_MAX);
 203             fn(def->name, opaque);
 204         }
 205     }
 206
 207     /* report leftovers as separate features */
 208     feat = find_first_bit(bitmap, S390_FEAT_MAX);
 209     while (feat < S390_FEAT_MAX) {
 210         fn(s390_feat_def(feat)->name, opaque);
 211         feat = find_next_bit(bitmap, S390_FEAT_MAX, feat + 1);
 212     };
 213 }
 214
 215 #define FEAT_GROUP_INIT(_name, _group, _desc)        \
 216     {                                                \
 217         .name = _name,                               \
 218         .desc = _desc,                               \
 219         .init = { S390_FEAT_GROUP_LIST_ ## _group }, \
 220     }
 221
 222 /* indexed by feature group number for easy lookup */
 223 static S390FeatGroupDef s390_feature_groups[] = {
 224     FEAT_GROUP_INIT("plo", PLO, "Perform-locked-operation facility"),
 225     FEAT_GROUP_INIT("tods", TOD_CLOCK_STEERING, "Tod-clock-steering facility"),
 226     FEAT_GROUP_INIT("gen13ptff", GEN13_PTFF, "PTFF enhancements introduced with z13"),
 227     FEAT_GROUP_INIT("msa", MSA, "Message-security-assist facility"),
 228     FEAT_GROUP_INIT("msa1", MSA_EXT_1, "Message-security-assist-extension 1 facility"),
 229     FEAT_GROUP_INIT("msa2", MSA_EXT_2, "Message-security-assist-extension 2 facility"),
 230     FEAT_GROUP_INIT("msa3", MSA_EXT_3, "Message-security-assist-extension 3 facility"),
 231     FEAT_GROUP_INIT("msa4", MSA_EXT_4, "Message-security-assist-extension 4 facility"),
 232     FEAT_GROUP_INIT("msa5", MSA_EXT_5, "Message-security-assist-extension 5 facility"),
 233     FEAT_GROUP_INIT("msa6", MSA_EXT_6, "Message-security-assist-extension 6 facility"),
 234     FEAT_GROUP_INIT("msa7", MSA_EXT_7, "Message-security-assist-extension 7 facility"),
 235     FEAT_GROUP_INIT("msa8", MSA_EXT_8, "Message-security-assist-extension 8 facility"),
 236     FEAT_GROUP_INIT("msa9", MSA_EXT_9, "Message-security-assist-extension 9 facility"),
 237     FEAT_GROUP_INIT("msa9_pckmo", MSA_EXT_9_PCKMO, "Message-security-assist-extension 9 PCKMO subfunctions"),
 238     FEAT_GROUP_INIT("mepochptff", MULTIPLE_EPOCH_PTFF, "PTFF enhancements introduced with Multiple-epoch facility"),
 239     FEAT_GROUP_INIT("esort", ENH_SORT, "Enhanced-sort facility"),
 240     FEAT_GROUP_INIT("deflate", DEFLATE_CONVERSION, "Deflate-conversion facility"),
 241 };
 242
 243 const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group)
 244 {
 245     return &s390_feature_groups[group];
 246 }
 247
 248 static void init_groups(void)
 249 {
 250     int i;
 251
 252     /* init all bitmaps from generated data initially */
 253     for (i = 0; i < ARRAY_SIZE(s390_feature_groups); i++) {
 254         s390_init_feat_bitmap(s390_feature_groups[i].init,
 255                               s390_feature_groups[i].feat);
 256     }
 257 }
 258
 259 type_init(init_groups)