[Qemu-devel] [PATCH for-2.8 32/38] s390x/kvm: don't enable key wrapping if msa3 is disabled

[Cornelia Huck]

From: David Hildenbrand <d...@linux.vnet.ibm.com>

As the CPU model now controls msa3, trying to set wrapping keys without
msa3 being around/enable in the kernel will produce misleading errors.

So let's simply not configure key wrapping if msa3 is not enabled and
make compat machines with disabled CPU model work correctly.

Signed-off-by: David Hildenbrand <d...@linux.vnet.ibm.com>
Message-Id: <1472062266-53206-25-git-send-email-d...@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.h...@de.ibm.com>
---
 target-s390x/cpu_models.c | 3 +++
 target-s390x/kvm.c        | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/target-s390x/cpu_models.c b/target-s390x/cpu_models.c
index abe35e1..7419bd0 100644
--- a/target-s390x/cpu_models.c
+++ b/target-s390x/cpu_models.c
@@ -155,6 +155,9 @@ bool s390_has_feat(S390Feat feat)
             if (feat == S390_FEAT_RUNTIME_INSTRUMENTATION) {
                 return kvm_s390_get_ri();
             }
+            if (feat == S390_FEAT_MSA_EXT_3) {
+                return true;
+            }
         }
 #endif
         return 0;
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 82a07ae..dfaf1ca 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -260,8 +260,10 @@ static void kvm_s390_init_dea_kw(void)
 
 void kvm_s390_crypto_reset(void)
 {
-    kvm_s390_init_aes_kw();
-    kvm_s390_init_dea_kw();
+    if (s390_has_feat(S390_FEAT_MSA_EXT_3)) {
+        kvm_s390_init_aes_kw();
+        kvm_s390_init_dea_kw();
+    }
 }
 
 int kvm_arch_init(MachineState *ms, KVMState *s)
-- 
2.9.3