diff a/src/hotspot/cpu/ppc/vm_version_ppc.cpp b/src/hotspot/cpu/ppc/vm_version_ppc.cpp
--- a/src/hotspot/cpu/ppc/vm_version_ppc.cpp
+++ b/src/hotspot/cpu/ppc/vm_version_ppc.cpp
@@ -340,10 +340,27 @@
   // This machine allows unaligned memory accesses
   if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
     FLAG_SET_DEFAULT(UseUnalignedAccesses, true);
   }
 
+  if (InlineTypePassFieldsAsArgs) {
+    warning("InlineTypePassFieldsAsArgs is not supported on this CPU");
+    FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
+  }
+  if (InlineTypeReturnedAsFields) {
+    warning("InlineTypeReturnedAsFields is not supported on this CPU");
+    FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
+  }
+
+  // TODO: Valhalla optimizations
+  if (FLAG_IS_DEFAULT(UseArrayFlattening                 )) FLAG_SET_DEFAULT(UseArrayFlattening                 , false);
+  if (FLAG_IS_DEFAULT(UseFieldFlattening                 )) FLAG_SET_DEFAULT(UseFieldFlattening                 , false);
+  if (FLAG_IS_DEFAULT(UseNullFreeNonAtomicValueFlattening)) FLAG_SET_DEFAULT(UseNullFreeNonAtomicValueFlattening, false);
+  if (FLAG_IS_DEFAULT(UseNullableAtomicValueFlattening   )) FLAG_SET_DEFAULT(UseNullableAtomicValueFlattening   , false);
+  if (FLAG_IS_DEFAULT(UseNullFreeAtomicValueFlattening   )) FLAG_SET_DEFAULT(UseNullFreeAtomicValueFlattening   , false);
+  if (FLAG_IS_DEFAULT(UseNullableNonAtomicValueFlattening)) FLAG_SET_DEFAULT(UseNullableNonAtomicValueFlattening, false);
+
   check_virtualizations();
 }
 
 void VM_Version::check_virtualizations() {
 #if defined(_AIX)