From 3aa8ecd6ba8715d04ce13568c609f023fea1b638 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Fri, 21 Dec 2018 15:36:04 +0000
Subject: [PATCH 02/22] s390x/kvm: pass values instead of pointers to
 kvm_s390_set_clock_*()

RH-Author: David Hildenbrand <david@redhat.com>
Message-id: <20181221153614.27961-3-david@redhat.com>
Patchwork-id: 83746
O-Subject: [RHEL-8.0 qemu-kvm v2 PATCH 02/12] s390x/kvm: pass values instead of pointers to kvm_s390_set_clock_*()
Bugzilla: 1653569
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>

We are going to factor out the TOD into a separate device and use const
pointers for device class functions where possible. We are passing right
now ordinary pointers that should never be touched when setting the TOD.
Let's just pass the values directly.

Note that s390_set_clock() will be removed in a follow-on patch and
therefore its calling convention is not changed.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180627134410.4901-3-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 4ab6a1feac0a142045d3b7bdbb8182a99c0b8980)
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 target/s390x/cpu.c       |  4 ++--
 target/s390x/kvm-stub.c  |  4 ++--
 target/s390x/kvm.c       | 12 ++++++------
 target/s390x/kvm_s390x.h |  4 ++--
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index c2b775f..1f590d1 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -414,9 +414,9 @@ int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
     int r = 0;
 
     if (kvm_enabled()) {
-        r = kvm_s390_set_clock_ext(tod_high, tod_low);
+        r = kvm_s390_set_clock_ext(*tod_high, *tod_low);
         if (r == -ENXIO) {
-            return kvm_s390_set_clock(tod_high, tod_low);
+            return kvm_s390_set_clock(*tod_high, *tod_low);
         }
     }
     /* Fixme TCG */
diff --git a/target/s390x/kvm-stub.c b/target/s390x/kvm-stub.c
index 29b1054..bf7795e 100644
--- a/target/s390x/kvm-stub.c
+++ b/target/s390x/kvm-stub.c
@@ -60,12 +60,12 @@ int kvm_s390_get_clock_ext(uint8_t *tod_high, uint64_t *tod_low)
     return -ENOSYS;
 }
 
-int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
+int kvm_s390_set_clock(uint8_t tod_high, uint64_t tod_low)
 {
     return -ENOSYS;
 }
 
-int kvm_s390_set_clock_ext(uint8_t *tod_high, uint64_t *tod_low)
+int kvm_s390_set_clock_ext(uint8_t tod_high, uint64_t tod_low)
 {
     return -ENOSYS;
 }
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 4cb3499..1cf117b 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -708,13 +708,13 @@ int kvm_s390_get_clock_ext(uint8_t *tod_high, uint64_t *tod_low)
     return r;
 }
 
-int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
+int kvm_s390_set_clock(uint8_t tod_high, uint64_t tod_low)
 {
     int r;
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
         .attr = KVM_S390_VM_TOD_LOW,
-        .addr = (uint64_t)tod_low,
+        .addr = (uint64_t)&tod_low,
     };
 
     r = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
@@ -723,15 +723,15 @@ int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
     }
 
     attr.attr = KVM_S390_VM_TOD_HIGH;
-    attr.addr = (uint64_t)tod_high;
+    attr.addr = (uint64_t)&tod_high;
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
-int kvm_s390_set_clock_ext(uint8_t *tod_high, uint64_t *tod_low)
+int kvm_s390_set_clock_ext(uint8_t tod_high, uint64_t tod_low)
 {
     struct kvm_s390_vm_tod_clock gtod = {
-        .epoch_idx = *tod_high,
-        .tod  = *tod_low,
+        .epoch_idx = tod_high,
+        .tod  = tod_low,
     };
     struct kvm_device_attr attr = {
         .group = KVM_S390_VM_TOD,
diff --git a/target/s390x/kvm_s390x.h b/target/s390x/kvm_s390x.h
index c383bf4..36eb34b 100644
--- a/target/s390x/kvm_s390x.h
+++ b/target/s390x/kvm_s390x.h
@@ -25,8 +25,8 @@ int kvm_s390_get_ri(void);
 int kvm_s390_get_gs(void);
 int kvm_s390_get_clock(uint8_t *tod_high, uint64_t *tod_clock);
 int kvm_s390_get_clock_ext(uint8_t *tod_high, uint64_t *tod_clock);
-int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_clock);
-int kvm_s390_set_clock_ext(uint8_t *tod_high, uint64_t *tod_clock);
+int kvm_s390_set_clock(uint8_t tod_high, uint64_t tod_clock);
+int kvm_s390_set_clock_ext(uint8_t tod_high, uint64_t tod_clock);
 void kvm_s390_enable_css_support(S390CPU *cpu);
 int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
                                     int vq, bool assign);
-- 
1.8.3.1