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s390x/cpumodel: implement QMP interface "query-cpu-model-baseline" 

Let's implement that interface by reusing our conversion code and
lookup code for CPU definitions.

In order to find a compatible CPU model, we first detect the maximum
possible CPU generation and then try to find a maximum model, satisfying
all base features (not exceeding the maximum generation).

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <20160905085244.99980-31-dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-09-05 10:52:44 +02:00 committed by Cornelia Huck
parent 4e82ef0502
commit f1a47d08ef
2 changed files with 57 additions and 1 deletions
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3
qapi-schema.json
View File

@ -3283,7 +3283,8 @@
# global properties may affect expansion of CPU models. Using # global properties may affect expansion of CPU models. Using
# query-cpu-model-expansion while using these is not advised. # query-cpu-model-expansion while using these is not advised.
# #
# Some architectures may not support baselining CPU models. # Some architectures may not support baselining CPU models. s390x supports
# baselining CPU models.
# #
# Returns: a CpuModelBaselineInfo. Returns an error if baselining CPU models is # Returns: a CpuModelBaselineInfo. Returns an error if baselining CPU models is
# not supported, if a model cannot be used, if a model contains # not supported, if a model cannot be used, if a model contains

55
target-s390x/cpu_models.c
View File

@ -534,6 +534,61 @@ CpuModelCompareInfo *arch_query_cpu_model_comparison(CpuModelInfo *infoa,
} }
return compare_info; return compare_info;
} }
CpuModelBaselineInfo *arch_query_cpu_model_baseline(CpuModelInfo *infoa,
CpuModelInfo *infob,
Error **errp)
{
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, errp);
if (*errp) {
return NULL;
}
cpu_model_from_info(&modelb, infob, errp);
if (*errp) {
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);
/* 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_malloc0(sizeof(*baseline_info));
baseline_info->model = g_malloc0(sizeof(*baseline_info->model));
cpu_info_from_model(baseline_info->model, &model, true);
return baseline_info;
}
#endif #endif
static void check_consistency(const S390CPUModel *model) static void check_consistency(const S390CPUModel *model)