target/s390x/cpu_models_sysemu.c

   1 /*
   2  * CPU models for s390x - System Emulation-only
   3  *
   4  * Copyright 2016 IBM Corp.
   5  *
   6  * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9  * your option) any later version. See the COPYING file in the top-level
  10  * directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "cpu.h"
  15 #include "s390x-internal.h"
  16 #include "kvm/kvm_s390x.h"
  17 #include "sysemu/kvm.h"
  18 #include "qapi/error.h"
  19 #include "qapi/visitor.h"
  20 #include "qapi/qmp/qerror.h"
  21 #include "qapi/qobject-input-visitor.h"
  22 #include "qapi/qmp/qdict.h"
  23 #include "qapi/qapi-commands-machine-target.h"
  24
  25 static void list_add_feat(const char *name, void *opaque);
  26
  27 static void check_unavailable_features(const S390CPUModel *max_model,
  28                                        const S390CPUModel *model,
  29                                        strList **unavailable)
  30 {
  31     S390FeatBitmap missing;
  32
  33     /* check general model compatibility */
  34     if (max_model->def->gen < model->def->gen ||
  35         (max_model->def->gen == model->def->gen &&
  36          max_model->def->ec_ga < model->def->ec_ga)) {
  37         list_add_feat("type", unavailable);
  38     }
  39
  40     /* detect missing features if any to properly report them */
  41     bitmap_andnot(missing, model->features, max_model->features,
  42                   S390_FEAT_MAX);
  43     if (!bitmap_empty(missing, S390_FEAT_MAX)) {
  44         s390_feat_bitmap_to_ascii(missing, unavailable, list_add_feat);
  45     }
  46 }
  47
  48 struct CpuDefinitionInfoListData {
  49     CpuDefinitionInfoList *list;
  50     S390CPUModel *model;
  51 };
  52
  53 static void create_cpu_model_list(ObjectClass *klass, void *opaque)
  54 {
  55     struct CpuDefinitionInfoListData *cpu_list_data = opaque;
  56     CpuDefinitionInfoList **cpu_list = &cpu_list_data->list;
  57     CpuDefinitionInfo *info;
  58     char *name = g_strdup(object_class_get_name(klass));
  59     S390CPUClass *scc = S390_CPU_CLASS(klass);
  60
  61     /* strip off the -s390x-cpu */
  62     g_strrstr(name, "-" TYPE_S390_CPU)[0] = 0;
  63     info = g_new0(CpuDefinitionInfo, 1);
  64     info->name = name;
  65     info->has_migration_safe = true;
  66     info->migration_safe = scc->is_migration_safe;
  67     info->q_static = scc->is_static;
  68     info->q_typename = g_strdup(object_class_get_name(klass));
  69     /* check for unavailable features */
  70     if (cpu_list_data->model) {
  71         Object *obj;
  72         S390CPU *sc;
  73         obj = object_new_with_class(klass);
  74         sc = S390_CPU(obj);
  75         if (sc->model) {
  76             info->has_unavailable_features = true;
  77             check_unavailable_features(cpu_list_data->model, sc->model,
  78                                        &info->unavailable_features);
  79         }
  80         object_unref(obj);
  81     }
  82
  83     QAPI_LIST_PREPEND(*cpu_list, info);
  84 }
  85
  86 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
  87 {
  88     struct CpuDefinitionInfoListData list_data = {
  89         .list = NULL,
  90     };
  91
  92     list_data.model = get_max_cpu_model(NULL);
  93
  94     object_class_foreach(create_cpu_model_list, TYPE_S390_CPU, false,
  95                          &list_data);
  96
  97     return list_data.list;
  98 }
  99
 100 static void cpu_model_from_info(S390CPUModel *model, const CpuModelInfo *info,
 101                                 Error **errp)
 102 {
 103     Error *err = NULL;
 104     const QDict *qdict = NULL;
 105     const QDictEntry *e;
 106     Visitor *visitor;
 107     ObjectClass *oc;
 108     S390CPU *cpu;
 109     Object *obj;
 110
 111     if (info->props) {
 112         qdict = qobject_to(QDict, info->props);
 113         if (!qdict) {
 114             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
 115             return;
 116         }
 117     }
 118
 119     oc = cpu_class_by_name(TYPE_S390_CPU, info->name);
 120     if (!oc) {
 121         error_setg(errp, "The CPU definition \'%s\' is unknown.", info->name);
 122         return;
 123     }
 124     if (S390_CPU_CLASS(oc)->kvm_required && !kvm_enabled()) {
 125         error_setg(errp, "The CPU definition '%s' requires KVM", info->name);
 126         return;
 127     }
 128     obj = object_new_with_class(oc);
 129     cpu = S390_CPU(obj);
 130
 131     if (!cpu->model) {
 132         error_setg(errp, "Details about the host CPU model are not available, "
 133                          "it cannot be used.");
 134         object_unref(obj);
 135         return;
 136     }
 137
 138     if (qdict) {
 139         visitor = qobject_input_visitor_new(info->props);
 140         if (!visit_start_struct(visitor, NULL, NULL, 0, errp)) {
 141             visit_free(visitor);
 142             object_unref(obj);
 143             return;
 144         }
 145         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 146             if (!object_property_set(obj, e->key, visitor, &err)) {
 147                 break;
 148             }
 149         }
 150         if (!err) {
 151             visit_check_struct(visitor, &err);
 152         }
 153         visit_end_struct(visitor, NULL);
 154         visit_free(visitor);
 155         if (err) {
 156             error_propagate(errp, err);
 157             object_unref(obj);
 158             return;
 159         }
 160     }
 161
 162     /* copy the model and throw the cpu away */
 163     memcpy(model, cpu->model, sizeof(*model));
 164     object_unref(obj);
 165 }
 166
 167 static void qdict_add_disabled_feat(const char *name, void *opaque)
 168 {
 169     qdict_put_bool(opaque, name, false);
 170 }
 171
 172 static void qdict_add_enabled_feat(const char *name, void *opaque)
 173 {
 174     qdict_put_bool(opaque, name, true);
 175 }
 176
 177 /* convert S390CPUDef into a static CpuModelInfo */
 178 static void cpu_info_from_model(CpuModelInfo *info, const S390CPUModel *model,
 179                                 bool delta_changes)
 180 {
 181     QDict *qdict = qdict_new();
 182     S390FeatBitmap bitmap;
 183
 184     /* always fallback to the static base model */
 185     info->name = g_strdup_printf("%s-base", model->def->name);
 186
 187     if (delta_changes) {
 188         /* features deleted from the base feature set */
 189         bitmap_andnot(bitmap, model->def->base_feat, model->features,
 190                       S390_FEAT_MAX);
 191         if (!bitmap_empty(bitmap, S390_FEAT_MAX)) {
 192             s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
 193         }
 194
 195         /* features added to the base feature set */
 196         bitmap_andnot(bitmap, model->features, model->def->base_feat,
 197                       S390_FEAT_MAX);
 198         if (!bitmap_empty(bitmap, S390_FEAT_MAX)) {
 199             s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_enabled_feat);
 200         }
 201     } else {
 202         /* expand all features */
 203         s390_feat_bitmap_to_ascii(model->features, qdict,
 204                                   qdict_add_enabled_feat);
 205         bitmap_complement(bitmap, model->features, S390_FEAT_MAX);
 206         s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
 207     }
 208
 209     if (!qdict_size(qdict)) {
 210         qobject_unref(qdict);
 211     } else {
 212         info->props = QOBJECT(qdict);
 213     }
 214 }
 215
 216 CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,
 217                                                       CpuModelInfo *model,
 218                                                       Error **errp)
 219 {
 220     Error *err = NULL;
 221     CpuModelExpansionInfo *expansion_info = NULL;
 222     S390CPUModel s390_model;
 223     bool delta_changes = false;
 224
 225     /* convert it to our internal representation */
 226     cpu_model_from_info(&s390_model, model, &err);
 227     if (err) {
 228         error_propagate(errp, err);
 229         return NULL;
 230     }
 231
 232     if (type == CPU_MODEL_EXPANSION_TYPE_STATIC) {
 233         delta_changes = true;
 234     } else if (type != CPU_MODEL_EXPANSION_TYPE_FULL) {
 235         error_setg(errp, "The requested expansion type is not supported.");
 236         return NULL;
 237     }
 238
 239     /* convert it back to a static representation */
 240     expansion_info = g_new0(CpuModelExpansionInfo, 1);
 241     expansion_info->model = g_malloc0(sizeof(*expansion_info->model));
 242     cpu_info_from_model(expansion_info->model, &s390_model, delta_changes);
 243     return expansion_info;
 244 }
 245
 246 static void list_add_feat(const char *name, void *opaque)
 247 {
 248     strList **last = (strList **) opaque;
 249
 250     QAPI_LIST_PREPEND(*last, g_strdup(name));
 251 }
 252
 253 CpuModelCompareInfo *qmp_query_cpu_model_comparison(CpuModelInfo *infoa,
 254                                                      CpuModelInfo *infob,
 255                                                      Error **errp)
 256 {
 257     Error *err = NULL;
 258     CpuModelCompareResult feat_result, gen_result;
 259     CpuModelCompareInfo *compare_info;
 260     S390FeatBitmap missing, added;
 261     S390CPUModel modela, modelb;
 262
 263     /* convert both models to our internal representation */
 264     cpu_model_from_info(&modela, infoa, &err);
 265     if (err) {
 266         error_propagate(errp, err);
 267         return NULL;
 268     }
 269     cpu_model_from_info(&modelb, infob, &err);
 270     if (err) {
 271         error_propagate(errp, err);
 272         return NULL;
 273     }
 274     compare_info = g_new0(CpuModelCompareInfo, 1);
 275
 276     /* check the cpu generation and ga level */
 277     if (modela.def->gen == modelb.def->gen) {
 278         if (modela.def->ec_ga == modelb.def->ec_ga) {
 279             /* ec and corresponding bc are identical */
 280             gen_result = CPU_MODEL_COMPARE_RESULT_IDENTICAL;
 281         } else if (modela.def->ec_ga < modelb.def->ec_ga) {
 282             gen_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
 283         } else {
 284             gen_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
 285         }
 286     } else if (modela.def->gen < modelb.def->gen) {
 287         gen_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
 288     } else {
 289         gen_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
 290     }
 291     if (gen_result != CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
 292         /* both models cannot be made identical */
 293         list_add_feat("type", &compare_info->responsible_properties);
 294     }
 295
 296     /* check the feature set */
 297     if (bitmap_equal(modela.features, modelb.features, S390_FEAT_MAX)) {
 298         feat_result = CPU_MODEL_COMPARE_RESULT_IDENTICAL;
 299     } else {
 300         bitmap_andnot(missing, modela.features, modelb.features, S390_FEAT_MAX);
 301         s390_feat_bitmap_to_ascii(missing,
 302                                   &compare_info->responsible_properties,
 303                                   list_add_feat);
 304         bitmap_andnot(added, modelb.features, modela.features, S390_FEAT_MAX);
 305         s390_feat_bitmap_to_ascii(added, &compare_info->responsible_properties,
 306                                   list_add_feat);
 307         if (bitmap_empty(missing, S390_FEAT_MAX)) {
 308             feat_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
 309         } else if (bitmap_empty(added, S390_FEAT_MAX)) {
 310             feat_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
 311         } else {
 312             feat_result = CPU_MODEL_COMPARE_RESULT_INCOMPATIBLE;
 313         }
 314     }
 315
 316     /* combine the results */
 317     if (gen_result == feat_result) {
 318         compare_info->result = gen_result;
 319     } else if (feat_result == CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
 320         compare_info->result = gen_result;
 321     } else if (gen_result == CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
 322         compare_info->result = feat_result;
 323     } else {
 324         compare_info->result = CPU_MODEL_COMPARE_RESULT_INCOMPATIBLE;
 325     }
 326     return compare_info;
 327 }
 328
 329 CpuModelBaselineInfo *qmp_query_cpu_model_baseline(CpuModelInfo *infoa,
 330                                                     CpuModelInfo *infob,
 331                                                     Error **errp)
 332 {
 333     Error *err = NULL;
 334     CpuModelBaselineInfo *baseline_info;
 335     S390CPUModel modela, modelb, model;
 336     uint16_t cpu_type;
 337     uint8_t max_gen_ga;
 338     uint8_t max_gen;
 339
 340     /* convert both models to our internal representation */
 341     cpu_model_from_info(&modela, infoa, &err);
 342     if (err) {
 343         error_propagate(errp, err);
 344         return NULL;
 345     }
 346
 347     cpu_model_from_info(&modelb, infob, &err);
 348     if (err) {
 349         error_propagate(errp, err);
 350         return NULL;
 351     }
 352
 353     /* features both models support */
 354     bitmap_and(model.features, modela.features, modelb.features, S390_FEAT_MAX);
 355
 356     /* detect the maximum model not regarding features */
 357     if (modela.def->gen == modelb.def->gen) {
 358         if (modela.def->type == modelb.def->type) {
 359             cpu_type = modela.def->type;
 360         } else {
 361             cpu_type = 0;
 362         }
 363         max_gen = modela.def->gen;
 364         max_gen_ga = MIN(modela.def->ec_ga, modelb.def->ec_ga);
 365     } else if (modela.def->gen > modelb.def->gen) {
 366         cpu_type = modelb.def->type;
 367         max_gen = modelb.def->gen;
 368         max_gen_ga = modelb.def->ec_ga;
 369     } else {
 370         cpu_type = modela.def->type;
 371         max_gen = modela.def->gen;
 372         max_gen_ga = modela.def->ec_ga;
 373     }
 374
 375     model.def = s390_find_cpu_def(cpu_type, max_gen, max_gen_ga,
 376                                   model.features);
 377
 378     /* models without early base features (esan3) are bad */
 379     if (!model.def) {
 380         error_setg(errp, "No compatible CPU model could be created as"
 381                    " important base features are disabled");
 382         return NULL;
 383     }
 384
 385     /* strip off features not part of the max model */
 386     bitmap_and(model.features, model.features, model.def->full_feat,
 387                S390_FEAT_MAX);
 388
 389     baseline_info = g_new0(CpuModelBaselineInfo, 1);
 390     baseline_info->model = g_malloc0(sizeof(*baseline_info->model));
 391     cpu_info_from_model(baseline_info->model, &model, true);
 392     return baseline_info;
 393 }
 394
 395 void apply_cpu_model(const S390CPUModel *model, Error **errp)
 396 {
 397     Error *err = NULL;
 398     static S390CPUModel applied_model;
 399     static bool applied;
 400
 401     /*
 402      * We have the same model for all VCPUs. KVM can only be configured before
 403      * any VCPUs are defined in KVM.
 404      */
 405     if (applied) {
 406         if (model && memcmp(&applied_model, model, sizeof(S390CPUModel))) {
 407             error_setg(errp, "Mixed CPU models are not supported on s390x.");
 408         }
 409         return;
 410     }
 411
 412     if (kvm_enabled()) {
 413         kvm_s390_apply_cpu_model(model, &err);
 414         if (err) {
 415             error_propagate(errp, err);
 416             return;
 417         }
 418     }
 419
 420     applied = true;
 421     if (model) {
 422         applied_model = *model;
 423     }
 424 }