From 79880b67f42bad47d885722d58abcedc53986759 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Fri, 21 Dec 2018 15:39:52 +0100
Subject: [PATCH 08/14] s390x/tcg: implement SET CLOCK

RH-Author: David Hildenbrand <david@redhat.com>
Message-id: <20181221153957.28183-8-david@redhat.com>
Patchwork-id: 83762
O-Subject: [RHEL-7.6.z qemu-kvm-ma PATCH 07/12] s390x/tcg: implement SET CLOCK
Bugzilla: 1672920
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

Conflicts:
	target/s390x/translate.c: ExitStatus vs. DisasJumpType

This allows a guest to change its TOD. We already take care of updating
all CKC timers from within S390TODClass.

Use MO_ALIGN to load the operand manually - this will properly trigger a
SPECIFICATION exception.

Acked-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180627134410.4901-8-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 9dc6753718d4c0fe327729fea94e4d9f3f5a3d17)
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/helper.h      |  1 +
 target/s390x/insn-data.def |  3 +--
 target/s390x/misc_helper.c | 16 ++++++++++++++++
 target/s390x/translate.c   |  9 +++++++++
 4 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index 59cba86..97c60ca 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -127,6 +127,7 @@ DEF_HELPER_4(diag, void, env, i32, i32, i32)
 DEF_HELPER_3(load_psw, noreturn, env, i64, i64)
 DEF_HELPER_FLAGS_2(spx, TCG_CALL_NO_RWG, void, env, i64)
 DEF_HELPER_FLAGS_1(stck, TCG_CALL_NO_RWG_SE, i64, env)
+DEF_HELPER_FLAGS_2(sck, TCG_CALL_NO_RWG, i32, env, i64)
 DEF_HELPER_FLAGS_2(sckc, TCG_CALL_NO_RWG, void, env, i64)
 DEF_HELPER_FLAGS_2(sckpf, TCG_CALL_NO_RWG, void, env, i64)
 DEF_HELPER_FLAGS_1(stckc, TCG_CALL_NO_RWG, i64, env)
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 1576194..5c6f33e 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -997,8 +997,7 @@
 /* SET ADDRESS SPACE CONTROL FAST */
     C(0xb279, SACF,    S,     Z,   0, a2, 0, 0, sacf, 0)
 /* SET CLOCK */
-    /* ??? Not implemented - is it necessary? */
-    C(0xb204, SCK,     S,     Z,   0, 0, 0, 0, 0, 0)
+    C(0xb204, SCK,     S,     Z,   la2, 0, 0, 0, sck, 0)
 /* SET CLOCK COMPARATOR */
     C(0xb206, SCKC,    S,     Z,   0, m2_64a, 0, 0, sckc, 0)
 /* SET CLOCK PROGRAMMABLE FIELD */
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index cada7af..d629b2f 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -185,6 +185,22 @@ void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque)
     helper_sckc(env, env->ckc);
 }
 
+/* Set Clock */
+uint32_t HELPER(sck)(CPUS390XState *env, uint64_t tod_low)
+{
+    S390TODState *td = s390_get_todstate();
+    S390TODClass *tdc = S390_TOD_GET_CLASS(td);
+    S390TOD tod = {
+        .high = 0,
+        .low = tod_low,
+    };
+
+    qemu_mutex_lock_iothread();
+    tdc->set(td, &tod, &error_abort);
+    qemu_mutex_unlock_iothread();
+    return 0;
+}
+
 /* Set Tod Programmable Field */
 void HELPER(sckpf)(CPUS390XState *env, uint64_t r0)
 {
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index 7d39ab3..ed9aff4 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -4015,6 +4015,15 @@ static ExitStatus op_stcke(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
+static ExitStatus op_sck(DisasContext *s, DisasOps *o)
+{
+    check_privileged(s);
+    tcg_gen_qemu_ld_i64(o->in1, o->addr1, get_mem_index(s), MO_TEQ | MO_ALIGN);
+    gen_helper_sck(cc_op, cpu_env, o->in1);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
 static ExitStatus op_sckc(DisasContext *s, DisasOps *o)
 {
     check_privileged(s);
-- 
1.8.3.1