Retain a list of deprecated features disjoint from any particular
CPU model. When a query-cpu-model-expansion is provided with the
"disable-deprecated-feats" option set, the resulting properties list
will include all deprecated features paired with false. Example:
{ ... "bpb": false, "csske": 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>
---
target/s390x/cpu_features.c | 14 ++++++++++++++
target/s390x/cpu_features.h | 1 +
target/s390x/cpu_models_sysemu.c | 20 ++++++++++++--------
3 files changed, 27 insertions(+), 8 deletions(-)
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 ef9fa80efd..b002819188 100644
--- a/target/s390x/cpu_models_sysemu.c
+++ b/target/s390x/cpu_models_sysemu.c
@@ -171,7 +171,8 @@ static void qdict_add_enabled_feat(const char *name, void
*opaque)
/* convert S390CPUDef into a static CpuModelInfo */
static void cpu_info_from_model(CpuModelInfo *info, const S390CPUModel
*model,
- bool delta_changes)
+ bool delta_changes,
+ bool disable_deprecated_feats)
{
QDict *qdict = qdict_new();
S390FeatBitmap bitmap;
@@ -201,6 +202,13 @@ static void cpu_info_from_model(CpuModelInfo *info, const
S390CPUModel *model,
s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
}
+ /* features flagged as deprecated */
+ if (disable_deprecated_feats) {
+ bitmap_zero(bitmap, S390_FEAT_MAX);
+ s390_get_deprecated_features(bitmap);
+ s390_feat_bitmap_to_ascii(bitmap, qdict, qdict_add_disabled_feat);
+ }