| Message ID | 20240429191059.11806-2-walling@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | query-cpu-model-expansion: report deprecated features | expand |
Collin Walling <walling@linux.ibm.com> writes: > 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 compatability with future hardware. > > Signed-off-by: Collin Walling <walling@linux.ibm.com> QAPI schema Acked-by: Markus Armbruster <armbru@redhat.com>
On 29.04.24 21:10, Collin Walling wrote: > 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 compatability with future hardware. > > Signed-off-by: Collin Walling <walling@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com>
diff --git a/qapi/machine-target.json b/qapi/machine-target.json index 29e695aa06..2942853092 100644 --- a/qapi/machine-target.json +++ b/qapi/machine-target.json @@ -20,11 +20,16 @@ # # @props: a dictionary of QOM properties to be applied # +# @deprecated-props: a list of properties that are flagged as deprecated +# by the CPU vendor. These props are a subset of the full model's +# definition list of properties. (since 9.1) +# # Since: 2.8 ## { 'struct': 'CpuModelInfo', 'data': { 'name': 'str', - '*props': 'any' } } + '*props': 'any', + '*deprecated-props': ['str'] } } ## # @CpuModelExpansionType: diff --git a/target/s390x/cpu_features.c b/target/s390x/cpu_features.c index d28eb65845..efafc9711c 100644 --- a/target/s390x/cpu_features.c +++ b/target/s390x/cpu_features.c @@ -212,6 +212,20 @@ void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque, }; } +void s390_get_deprecated_features(S390FeatBitmap features) +{ + static const int feats[] = { + /* CSSKE is deprecated on newer generations */ + S390_FEAT_CONDITIONAL_SSKE, + S390_FEAT_BPB, + }; + int i; + + for (i = 0; i < ARRAY_SIZE(feats); i++) { + set_bit(feats[i], features); + } +} + #define FEAT_GROUP_INIT(_name, _group, _desc) \ { \ .name = _name, \ diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h index a9bd68a2e1..661a8cd6db 100644 --- a/target/s390x/cpu_features.h +++ b/target/s390x/cpu_features.h @@ -69,6 +69,7 @@ void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type, uint8_t *data); void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque, void (*fn)(const char *name, void *opaque)); +void s390_get_deprecated_features(S390FeatBitmap features); /* Definition of a CPU feature group */ typedef struct { diff --git a/target/s390x/cpu_models_sysemu.c b/target/s390x/cpu_models_sysemu.c index 2d99218069..abdd0e19d8 100644 --- a/target/s390x/cpu_models_sysemu.c +++ b/target/s390x/cpu_models_sysemu.c @@ -206,6 +206,14 @@ static void cpu_info_from_model(CpuModelInfo *info, const S390CPUModel *model, } 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,
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 compatability with future hardware. Signed-off-by: Collin Walling <walling@linux.ibm.com> --- qapi/machine-target.json | 7 ++++++- target/s390x/cpu_features.c | 14 ++++++++++++++ target/s390x/cpu_features.h | 1 + target/s390x/cpu_models_sysemu.c | 8 ++++++++ 4 files changed, 29 insertions(+), 1 deletion(-)