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qemu/target/s390x/cpu_models_sysemu.c
Collin Walling 8aa2211e85 target/s390x: report deprecated-props in cpu-model-expansion reply 
Retain a list of deprecated features disjoint from any particular
CPU model. A query-cpu-model-expansion reply will now provide a list of
properties (i.e. features) that are flagged as deprecated. Example:

    {
      "return": {
        "model": {
          "name": "z14.2-base",
          "deprecated-props": [
            "bpb",
            "csske"
          ],
          "props": {
            "pfmfi": false,
            "exrl": true,
            ...a lot more props...
            "skey": false,
            "vxpdeh2": false
          }
        }
      }
    }

It is recommended that s390 guests operate with these features
explicitly disabled to ensure compatibility with future hardware.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-ID: <20240429191059.11806-2-walling@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-05-10 08:34:20 +02:00

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/*
* 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 "qapi/error.h"
#include "qapi/visitor.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,
const char *info_arg_name, Error **errp)
{
Error *err = NULL;
const QDict *qdict;
const QDictEntry *e;
Visitor *visitor;
ObjectClass *oc;
S390CPU *cpu;
Object *obj;
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 (info->props) {
g_autofree const char *props_name = g_strdup_printf("%s.props",
info_arg_name);
visitor = qobject_input_visitor_new(info->props);
if (!visit_start_struct(visitor, props_name, NULL, 0, errp)) {
visit_free(visitor);
object_unref(obj);
return;
}
qdict = qobject_to(QDict, info->props);
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);
}
/* features flagged as deprecated */
bitmap_zero(bitmap, S390_FEAT_MAX);
s390_get_deprecated_features(bitmap);
bitmap_and(bitmap, bitmap, model->def->full_feat, S390_FEAT_MAX);
s390_feat_bitmap_to_ascii(bitmap, &info->deprecated_props, list_add_feat);
info->has_deprecated_props = !!info->deprecated_props;
}
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, "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, "modela", &err);
if (err) {
error_propagate(errp, err);
return NULL;
}
cpu_model_from_info(&modelb, infob, "modelb", &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, "modela", &err);
if (err) {
error_propagate(errp, err);
return NULL;
}
cpu_model_from_info(&modelb, infob, "modelb", &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)
{
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()) {
if (!kvm_s390_apply_cpu_model(model, errp)) {
return;
}
}
applied = true;
if (model) {
applied_model = *model;
}
}
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