s390x/kvm: factor out actual handling of STOP interrupts

For KVM, the KVM module decides when a STOP can be performed (when the
STOP interrupt can be processed). Factor it out so we can use it
later for TCG.
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-19-david@redhat.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

target/s390x/internal.h

@@ -418,5 +418,6 @@ void s390x_translate_init(void);
 
 /* sigp.c */
 int handle_sigp(CPUS390XState *env, uint8_t order, uint64_t r1, uint64_t r3);
+void do_stop_interrupt(CPUS390XState *env);
 
 #endif /* S390X_INTERNAL_H */

target/s390x/kvm.c

@@ -1634,13 +1634,7 @@ static int handle_intercept(S390CPU *cpu)
             r = EXCP_HALTED;
             break;
         case ICPT_CPU_STOP:
-            if (s390_cpu_set_state(CPU_STATE_STOPPED, cpu) == 0) {
-                qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
-            }
-            if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
-                s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
-            }
-            cpu->env.sigp_order = 0;
+            do_stop_interrupt(&cpu->env);
             r = EXCP_HALTED;
             break;
         case ICPT_OPEREXC:

target/s390x/sigp.c

@@ -81,7 +81,7 @@ static void sigp_stop_and_store_status(CPUState *cs, run_on_cpu_data arg)
     case CPU_STATE_OPERATING:
         cpu->env.sigp_order = SIGP_STOP_STORE_STATUS;
         cpu_inject_stop(cpu);
-        /* store will be performed when handling the stop intercept */
+        /* store will be performed in do_stop_interrup() */
         break;
     case CPU_STATE_STOPPED:
         /* already stopped, just store the status */
@@ -360,6 +360,19 @@ int s390_cpu_restart(S390CPU *cpu)
     return 0;
 }
 
+void do_stop_interrupt(CPUS390XState *env)
+{
+    S390CPU *cpu = s390_env_get_cpu(env);
+
+    if (s390_cpu_set_state(CPU_STATE_STOPPED, cpu) == 0) {
+        qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+    }
+    if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
+        s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
+    }
+    env->sigp_order = 0;
+}
+
 void s390_init_sigp(void)
 {
     qemu_mutex_init(&qemu_sigp_mutex);