aboutsummaryrefslogtreecommitdiff
path: root/target/s390x/cpu_models_sysemu.c
blob: 05c3ccaaff2c11d846daecd3dc0931fd266a0f39 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
 * CPU models for s390x - System Emulation-only
 *
 * Copyright 2016 IBM Corp.
 *
 * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or (at
 * your option) any later version. See the COPYING file in the top-level
 * directory.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "s390x-internal.h"
#include "kvm/kvm_s390x.h"
#include "sysemu/kvm.h"
#include "sysemu/tcg.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qapi-commands-machine-target.h"

static void list_add_feat(const char *name, void *opaque);

static void check_unavailable_features(const S390CPUModel *max_model,
                                       const S390CPUModel *model,
                                       strList **unavailable)
{
    S390FeatBitmap missing;

    /* check general model compatibility */
    if (max_model->def->gen < model->def->gen ||
        (max_model->def->gen == model->def->gen &&
         max_model->def->ec_ga < model->def->ec_ga)) {
        list_add_feat("type", unavailable);
    }

    /* detect missing features if any to properly report them */
    bitmap_andnot(missing, model->features, max_model->features,
                  S390_FEAT_MAX);
    if (!bitmap_empty(missing, S390_FEAT_MAX)) {
        s390_feat_bitmap_to_ascii(missing, unavailable, list_add_feat);
    }
}

struct CpuDefinitionInfoListData {
    CpuDefinitionInfoList *list;
    S390CPUModel *model;
};

static void create_cpu_model_list(ObjectClass *klass, void *opaque)
{
    struct CpuDefinitionInfoListData *cpu_list_data = opaque;
    CpuDefinitionInfoList **cpu_list = &cpu_list_data->list;
    CpuDefinitionInfo *info;
    char *name = g_strdup(object_class_get_name(klass));
    S390CPUClass *scc = S390_CPU_CLASS(klass);

    /* strip off the -s390x-cpu */
    g_strrstr(name, "-" TYPE_S390_CPU)[0] = 0;
    info = g_new0(CpuDefinitionInfo, 1);
    info->name = name;
    info->has_migration_safe = true;
    info->migration_safe = scc->is_migration_safe;
    info->q_static = scc->is_static;
    info->q_typename = g_strdup(object_class_get_name(klass));
    /* check for unavailable features */
    if (cpu_list_data->model) {
        Object *obj;
        S390CPU *sc;
        obj = object_new_with_class(klass);
        sc = S390_CPU(obj);
        if (sc->model) {
            info->has_unavailable_features = true;
            check_unavailable_features(cpu_list_data->model, sc->model,
                                       &info->unavailable_features);
        }
        object_unref(obj);
    }

    QAPI_LIST_PREPEND(*cpu_list, info);
}

CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
{
    struct CpuDefinitionInfoListData list_data = {
        .list = NULL,
    };

    list_data.model = get_max_cpu_model(NULL);

    object_class_foreach(create_cpu_model_list, TYPE_S390_CPU, false,
                         &list_data);

    return list_data.list;
}

static void cpu_model_from_info(S390CPUModel *model, const CpuModelInfo *info,
                                Error **errp)
{
    Error *err = NULL;
    const QDict *qdict = NULL;
    const QDictEntry *e;
    Visitor *visitor;
    ObjectClass *oc;
    S390CPU *cpu;
    Object *obj;

    if (info->props) {
        qdict = qobject_to(QDict, info->props);
        if (!qdict) {
            error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "props", "dict");
            return;
        }
    }

    oc = cpu_class_by_name(TYPE_S390_CPU, info->name);
    if (!oc) {
        error_setg(errp, "The CPU definition \'%s\' is unknown.", info->name);
        return;
    }
    if (S390_CPU_CLASS(oc)->kvm_required && !kvm_enabled()) {
        error_setg(errp, "The CPU definition '%s' requires KVM", info->name);
        return;
    }
    obj = object_new_with_class(oc);
    cpu = S390_CPU(obj);

    if (!cpu->model) {
        error_setg(errp, "Details about the host CPU model are not available, "
                         "it cannot be used.");
        object_unref(obj);
        return;
    }

    if (qdict) {
        visitor = qobject_input_visitor_new(info->props);
        if (!visit_start_struct(visitor, NULL, NULL, 0, errp)) {
            visit_free(visitor);
            object_unref(obj);
            return;
        }
        for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
            if (!object_property_set(obj, e->key, visitor, &err)) {
                break;
            }
        }
        if (!err) {
            visit_check_struct(visitor, &err);
        }
        visit_end_struct(visitor, NULL);
        visit_free(visitor);
        if (err) {
            error_propagate(errp, err);
            object_unref(obj);
            return;
        }
    }

    /* copy the model and throw the cpu away */
    memcpy(model, cpu->model, sizeof(*model));
    object_unref(obj);
}

static void qdict_add_disabled_feat(const char *name, void *opaque)
{
    qdict_put_bool(opaque, name, false);
}

static void qdict_add_enabled_feat(const char *name, void *opaque)
{
    qdict_put_bool(opaque, name, true);
}

/* convert S390CPUDef into a static CpuModelInfo */
static void cpu_info_from_model(CpuModelInfo *info, const S390CPUModel *model,
                                bool delta_changes)
{
    QDict *qdict = qdict_new();
    S390FeatBitmap bitmap;

    /* always fallback to the static base model */
    info->name = g_strdup_printf("%s-base", model->def->name);

    if (delta_changes) {
        /* features deleted from the base feature set */
        bitmap_andnot(bitmap, model->def->base_feat, model->features,
                      S390_FEAT_MAX);
        if (!bitmap_empty(bitmap, S390_FEAT_MAX)) {
            s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
        }

        /* features added to the base feature set */
        bitmap_andnot(bitmap, model->features, model->def->base_feat,
                      S390_FEAT_MAX);
        if (!bitmap_empty(bitmap, S390_FEAT_MAX)) {
            s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_enabled_feat);
        }
    } else {
        /* expand all features */
        s390_feat_bitmap_to_ascii(model->features, qdict,
                                  qdict_add_enabled_feat);
        bitmap_complement(bitmap, model->features, S390_FEAT_MAX);
        s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
    }

    if (!qdict_size(qdict)) {
        qobject_unref(qdict);
    } else {
        info->props = QOBJECT(qdict);
        info->has_props = true;
    }
}

CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,
                                                      CpuModelInfo *model,
                                                      Error **errp)
{
    Error *err = NULL;
    CpuModelExpansionInfo *expansion_info = NULL;
    S390CPUModel s390_model;
    bool delta_changes = false;

    /* convert it to our internal representation */
    cpu_model_from_info(&s390_model, model, &err);
    if (err) {
        error_propagate(errp, err);
        return NULL;
    }

    if (type == CPU_MODEL_EXPANSION_TYPE_STATIC) {
        delta_changes = true;
    } else if (type != CPU_MODEL_EXPANSION_TYPE_FULL) {
        error_setg(errp, "The requested expansion type is not supported.");
        return NULL;
    }

    /* convert it back to a static representation */
    expansion_info = g_new0(CpuModelExpansionInfo, 1);
    expansion_info->model = g_malloc0(sizeof(*expansion_info->model));
    cpu_info_from_model(expansion_info->model, &s390_model, delta_changes);
    return expansion_info;
}

static void list_add_feat(const char *name, void *opaque)
{
    strList **last = (strList **) opaque;

    QAPI_LIST_PREPEND(*last, g_strdup(name));
}

CpuModelCompareInfo *qmp_query_cpu_model_comparison(CpuModelInfo *infoa,
                                                     CpuModelInfo *infob,
                                                     Error **errp)
{
    Error *err = NULL;
    CpuModelCompareResult feat_result, gen_result;
    CpuModelCompareInfo *compare_info;
    S390FeatBitmap missing, added;
    S390CPUModel modela, modelb;

    /* convert both models to our internal representation */
    cpu_model_from_info(&modela, infoa, &err);
    if (err) {
        error_propagate(errp, err);
        return NULL;
    }
    cpu_model_from_info(&modelb, infob, &err);
    if (err) {
        error_propagate(errp, err);
        return NULL;
    }
    compare_info = g_new0(CpuModelCompareInfo, 1);

    /* check the cpu generation and ga level */
    if (modela.def->gen == modelb.def->gen) {
        if (modela.def->ec_ga == modelb.def->ec_ga) {
            /* ec and corresponding bc are identical */
            gen_result = CPU_MODEL_COMPARE_RESULT_IDENTICAL;
        } else if (modela.def->ec_ga < modelb.def->ec_ga) {
            gen_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
        } else {
            gen_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
        }
    } else if (modela.def->gen < modelb.def->gen) {
        gen_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
    } else {
        gen_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
    }
    if (gen_result != CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
        /* both models cannot be made identical */
        list_add_feat("type", &compare_info->responsible_properties);
    }

    /* check the feature set */
    if (bitmap_equal(modela.features, modelb.features, S390_FEAT_MAX)) {
        feat_result = CPU_MODEL_COMPARE_RESULT_IDENTICAL;
    } else {
        bitmap_andnot(missing, modela.features, modelb.features, S390_FEAT_MAX);
        s390_feat_bitmap_to_ascii(missing,
                                  &compare_info->responsible_properties,
                                  list_add_feat);
        bitmap_andnot(added, modelb.features, modela.features, S390_FEAT_MAX);
        s390_feat_bitmap_to_ascii(added, &compare_info->responsible_properties,
                                  list_add_feat);
        if (bitmap_empty(missing, S390_FEAT_MAX)) {
            feat_result = CPU_MODEL_COMPARE_RESULT_SUBSET;
        } else if (bitmap_empty(added, S390_FEAT_MAX)) {
            feat_result = CPU_MODEL_COMPARE_RESULT_SUPERSET;
        } else {
            feat_result = CPU_MODEL_COMPARE_RESULT_INCOMPATIBLE;
        }
    }

    /* combine the results */
    if (gen_result == feat_result) {
        compare_info->result = gen_result;
    } else if (feat_result == CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
        compare_info->result = gen_result;
    } else if (gen_result == CPU_MODEL_COMPARE_RESULT_IDENTICAL) {
        compare_info->result = feat_result;
    } else {
        compare_info->result = CPU_MODEL_COMPARE_RESULT_INCOMPATIBLE;
    }
    return compare_info;
}

CpuModelBaselineInfo *qmp_query_cpu_model_baseline(CpuModelInfo *infoa,
                                                    CpuModelInfo *infob,
                                                    Error **errp)
{
    Error *err = NULL;
    CpuModelBaselineInfo *baseline_info;
    S390CPUModel modela, modelb, model;
    uint16_t cpu_type;
    uint8_t max_gen_ga;
    uint8_t max_gen;

    /* convert both models to our internal representation */
    cpu_model_from_info(&modela, infoa, &err);
    if (err) {
        error_propagate(errp, err);
        return NULL;
    }

    cpu_model_from_info(&modelb, infob, &err);
    if (err) {
        error_propagate(errp, err);
        return NULL;
    }

    /* features both models support */
    bitmap_and(model.features, modela.features, modelb.features, S390_FEAT_MAX);

    /* detect the maximum model not regarding features */
    if (modela.def->gen == modelb.def->gen) {
        if (modela.def->type == modelb.def->type) {
            cpu_type = modela.def->type;
        } else {
            cpu_type = 0;
        }
        max_gen = modela.def->gen;
        max_gen_ga = MIN(modela.def->ec_ga, modelb.def->ec_ga);
    } else if (modela.def->gen > modelb.def->gen) {
        cpu_type = modelb.def->type;
        max_gen = modelb.def->gen;
        max_gen_ga = modelb.def->ec_ga;
    } else {
        cpu_type = modela.def->type;
        max_gen = modela.def->gen;
        max_gen_ga = modela.def->ec_ga;
    }

    model.def = s390_find_cpu_def(cpu_type, max_gen, max_gen_ga,
                                  model.features);

    /* models without early base features (esan3) are bad */
    if (!model.def) {
        error_setg(errp, "No compatible CPU model could be created as"
                   " important base features are disabled");
        return NULL;
    }

    /* strip off features not part of the max model */
    bitmap_and(model.features, model.features, model.def->full_feat,
               S390_FEAT_MAX);

    baseline_info = g_new0(CpuModelBaselineInfo, 1);
    baseline_info->model = g_malloc0(sizeof(*baseline_info->model));
    cpu_info_from_model(baseline_info->model, &model, true);
    return baseline_info;
}

void apply_cpu_model(const S390CPUModel *model, Error **errp)
{
    Error *err = NULL;
    static S390CPUModel applied_model;
    static bool applied;

    /*
     * We have the same model for all VCPUs. KVM can only be configured before
     * any VCPUs are defined in KVM.
     */
    if (applied) {
        if (model && memcmp(&applied_model, model, sizeof(S390CPUModel))) {
            error_setg(errp, "Mixed CPU models are not supported on s390x.");
        }
        return;
    }

    if (kvm_enabled()) {
        kvm_s390_apply_cpu_model(model, &err);
        if (err) {
            error_propagate(errp, err);
            return;
        }
    }

    applied = true;
    if (model) {
        applied_model = *model;
    }
}