[PATCH] s390x: pv: Fence additional unavailable SCLP facilities for PV guests

[Janosch Frank]

There's no VSIE support for a protected guest, so let's better not
advertise it and its support facilities.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
CI:
https://gitlab.com/frankja/qemu/-/pipelines/224881703
---
 target/s390x/cpu_features.c | 38 ++++++++++++++++++++++++++++++++++++-
 target/s390x/cpu_models.c   | 24 +++++++++++++++++++++--
 2 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/target/s390x/cpu_features.c b/target/s390x/cpu_features.c
index 42fe0bf4ca..7d7ea8e3b8 100644
--- a/target/s390x/cpu_features.c
+++ b/target/s390x/cpu_features.c
@@ -107,8 +107,44 @@ void s390_fill_feat_block(const S390FeatBitmap features, 
S390FeatType type,
         feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
     }
 
-    if (type == S390_FEAT_TYPE_SCLP_FAC134 && s390_is_pv()) {
+    if (!s390_is_pv()) {
+        return;
+    }
+
+    /*
+     * Some facilities are not available for CPUs in protected mode:
+     * - All SIE facilities because SIE is not available
+     * - DIAG318
+     *
+     * As VMs can move in and out of protected mode the CPU model
+     * doesn't protect us from that problem because it is only
+     * validated at the start of the VM.
+     */
+    switch (type) {
+    case S390_FEAT_TYPE_SCLP_CPU:
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_F2)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_SKEY)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_GPERE)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIIF)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_SIGPIF)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_IB)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_CEI)->bit, data);
+        break;
+    case S390_FEAT_TYPE_SCLP_CONF_CHAR:
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_KSS)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_GSLS)->bit, data);
+        break;
+    case S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT:
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_64BSCAO)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_CMMA)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_PFMFI)->bit, data);
+        clear_be_bit(s390_feat_def(S390_FEAT_SIE_IBS)->bit, data);
+        break;
+    case S390_FEAT_TYPE_SCLP_FAC134:
         clear_be_bit(s390_feat_def(S390_FEAT_DIAG_318)->bit, data);
+        break;
+    default:
+        return;
     }
 }
 
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index b5abff8bef..51feb71546 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -239,8 +239,28 @@ bool s390_has_feat(S390Feat feat)
         }
         return 0;
     }
-    if (feat == S390_FEAT_DIAG_318 && s390_is_pv()) {
-        return false;
+
+    if (s390_is_pv()) {
+        switch (feat) {
+        case S390_FEAT_DIAG_318:
+        case S390_FEAT_SIE_F2:
+        case S390_FEAT_SIE_SKEY:
+        case S390_FEAT_SIE_GPERE:
+        case S390_FEAT_SIE_SIIF:
+        case S390_FEAT_SIE_SIGPIF:
+        case S390_FEAT_SIE_IB:
+        case S390_FEAT_SIE_CEI:
+        case S390_FEAT_SIE_KSS:
+        case S390_FEAT_SIE_GSLS:
+        case S390_FEAT_SIE_64BSCAO:
+        case S390_FEAT_SIE_CMMA:
+        case S390_FEAT_SIE_PFMFI:
+        case S390_FEAT_SIE_IBS:
+            return false;
+            break;
+        default:
+            break;
+        }
     }
     return test_bit(feat, cpu->model->features);
 }
-- 
2.25.1