diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def
index fe5e591..075ff59 100644
--- a/target-s390x/insn-data.def
+++ b/target-s390x/insn-data.def
@@ -915,17 +915,17 @@
 /* TEST PROTECTION */
     C(0xe501, TPROT,   SSE,   Z,   la1, a2, 0, 0, tprot, 0)
 
-/* I/O Instructions.  For each we simply indicate non-operation.  */
-    C(0xb276, XSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb230, CSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb231, HSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb232, MSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb23b, RCHP,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb238, RSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb233, SSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb234, STSCH,   S,     Z,   0, 0, 0, 0, subchannel, 0)
-    C(0xb235, TSCH,    S,     Z,   0, 0, 0, 0, subchannel, 0)
+/* CCW I/O Instructions */
+    C(0xb276, XSCH,    S,     Z,   0, 0, 0, 0, xsch, 0)
+    C(0xb230, CSCH,    S,     Z,   0, 0, 0, 0, csch, 0)
+    C(0xb231, HSCH,    S,     Z,   0, 0, 0, 0, hsch, 0)
+    C(0xb232, MSCH,    S,     Z,   0, insn, 0, 0, msch, 0)
+    C(0xb23b, RCHP,    S,     Z,   0, 0, 0, 0, rchp, 0)
+    C(0xb238, RSCH,    S,     Z,   0, 0, 0, 0, rsch, 0)
+    C(0xb233, SSCH,    S,     Z,   0, insn, 0, 0, ssch, 0)
+    C(0xb234, STSCH,   S,     Z,   0, insn, 0, 0, stsch, 0)
+    C(0xb235, TSCH,    S,     Z,   0, insn, 0, 0, tsch, 0)
     /* ??? Not listed in PoO ninth edition, but there's a linux driver that
        uses it: "A CHSC subchannel is usually present on LPAR only."  */
-    C(0xb25f, CHSC,    S,     Z,   0, 0, 0, 0, subchannel, 0)
+    C(0xb25f, CHSC,  RRE,     Z,   0, insn, 0, 0, chsc, 0)
 #endif /* CONFIG_USER_ONLY */