File s390x-kvm-Make-kvm_sclp_service_call-voi.patch of Package qemu

From: Janosch Frank <frankja@linux.ibm.com>
Date: Fri, 29 Nov 2019 04:17:13 -0500
Subject: s390x: kvm: Make kvm_sclp_service_call void

References: bsc#1167075

It defaults to returning 0 anyway and that return value is not
necessary, as 0 is also the default rc that the caller would return.

While doing that we can simplify the logic a bit and return early if
we inject a PGM exception.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20191129091713.4582-1-frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 15b6c0370c3e2774fd9ffda5c10c6e36952e8eb6)
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 target/s390x/kvm.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 0c9d14b4b115de974e21af3f0f47..ad6e38c8761be7e0cad57771f49b 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -1159,13 +1159,13 @@ void kvm_s390_access_exception(S390CPU *cpu, uint16_t code, uint64_t te_code)
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
-static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
+static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
                                  uint16_t ipbh0)
 {
     CPUS390XState *env = &cpu->env;
     uint64_t sccb;
     uint32_t code;
-    int r = 0;
+    int r;
 
     sccb = env->regs[ipbh0 & 0xf];
     code = env->regs[(ipbh0 & 0xf0) >> 4];
@@ -1173,11 +1173,9 @@ static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
     r = sclp_service_call(env, sccb, code);
     if (r < 0) {
         kvm_s390_program_interrupt(cpu, -r);
-    } else {
-        setcc(cpu, r);
+        return;
     }
-
-    return 0;
+    setcc(cpu, r);
 }
 
 static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
@@ -1240,7 +1238,7 @@ static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
         setcc(cpu, 3);
         break;
     case PRIV_B2_SCLP_CALL:
-        rc = kvm_sclp_service_call(cpu, run, ipbh0);
+        kvm_sclp_service_call(cpu, run, ipbh0);
         break;
     default:
         rc = -1;