diff --git a/target-s390x/helper.h b/target-s390x/helper.h
index 6be9f44..53db519 100644
--- a/target-s390x/helper.h
+++ b/target-s390x/helper.h
@@ -116,4 +116,15 @@ DEF_HELPER_FLAGS_2(lura, TCG_CALL_NO_WG, i64, env, i64)
 DEF_HELPER_FLAGS_2(lurag, TCG_CALL_NO_WG, i64, env, i64)
 DEF_HELPER_FLAGS_3(stura, TCG_CALL_NO_WG, void, env, i64, i64)
 DEF_HELPER_FLAGS_3(sturg, TCG_CALL_NO_WG, void, env, i64, i64)
+
+DEF_HELPER_2(xsch, void, env, i64)
+DEF_HELPER_2(csch, void, env, i64)
+DEF_HELPER_2(hsch, void, env, i64)
+DEF_HELPER_3(msch, void, env, i64, i64)
+DEF_HELPER_2(rchp, void, env, i64)
+DEF_HELPER_2(rsch, void, env, i64)
+DEF_HELPER_3(ssch, void, env, i64, i64)
+DEF_HELPER_3(stsch, void, env, i64, i64)
+DEF_HELPER_3(tsch, void, env, i64, i64)
+DEF_HELPER_2(chsc, void, env, i64)
 #endif
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 */
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
index 3addde5..a4ff172 100644
--- a/target-s390x/misc_helper.c
+++ b/target-s390x/misc_helper.c
@@ -503,3 +503,65 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
     return cc;
 }
 #endif
+
+#ifndef CONFIG_USER_ONLY
+void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_xsch(cpu, r1);
+}
+
+void HELPER(csch)(CPUS390XState *env, uint64_t r1)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_csch(cpu, r1);
+}
+
+void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_hsch(cpu, r1);
+}
+
+void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_msch(cpu, r1, inst >> 16);
+}
+
+void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_rchp(cpu, r1);
+}
+
+void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_rsch(cpu, r1);
+}
+
+void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_ssch(cpu, r1, inst >> 16);
+}
+
+void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_stsch(cpu, r1, inst >> 16);
+}
+
+void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_tsch(cpu, r1, inst >> 16);
+}
+
+void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+    ioinst_handle_chsc(cpu, inst >> 16);
+}
+#endif
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index bde5e8a..df3389d 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -1001,6 +1001,7 @@ enum DisasFieldIndexC {
 };
 
 struct DisasFields {
+    uint64_t raw_insn;
     unsigned op:8;
     unsigned op2:8;
     unsigned presentC:16;
@@ -3588,11 +3589,93 @@ static ExitStatus op_spx(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
-static ExitStatus op_subchannel(DisasContext *s, DisasOps *o)
+static ExitStatus op_xsch(DisasContext *s, DisasOps *o)
 {
     check_privileged(s);
-    /* Not operational.  */
-    gen_op_movi_cc(s, 3);
+    potential_page_fault(s);
+    gen_helper_xsch(cpu_env, regs[1]);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_csch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_csch(cpu_env, regs[1]);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_hsch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_hsch(cpu_env, regs[1]);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_msch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_msch(cpu_env, regs[1], o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_rchp(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_rchp(cpu_env, regs[1]);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_rsch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_rsch(cpu_env, regs[1]);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_ssch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_ssch(cpu_env, regs[1], o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_stsch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_stsch(cpu_env, regs[1], o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_tsch(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_tsch(cpu_env, regs[1], o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_chsc(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    potential_page_fault(s);
+    gen_helper_chsc(cpu_env, o->in2);
+    set_cc_static(s);
     return NO_EXIT;
 }
 
@@ -4843,6 +4926,14 @@ static void in2_i2_32u_shl(DisasContext *s, DisasFields *f, DisasOps *o)
 }
 #define SPEC_in2_i2_32u_shl 0
 
+#ifndef CONFIG_USER_ONLY
+static void in2_insn(DisasContext *s, DisasFields *f, DisasOps *o)
+{
+    o->in2 = tcg_const_i64(s->fields->raw_insn);
+}
+#define SPEC_in2_insn 0
+#endif
+
 /* ====================================================================== */
 
 /* Find opc within the table of insns.  This is formulated as a switch
@@ -5019,6 +5110,7 @@ static const DisasInsn *extract_insn(CPUS390XState *env, DisasContext *s,
     }
 
     memset(f, 0, sizeof(*f));
+    f->raw_insn = insn;
     f->op = op;
     f->op2 = op2;
 
