target/s390x: factor out handling of WAIT PSW into s390_handle_wait()

This will now also detect crashes under TCG. We can directly use
cpu->env.psw.addr instead of kvm_run, as we do a cpu_synchronize_state().
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-9-david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

target/s390x/helper.c

@@ -26,6 +26,7 @@
 #include "qemu/timer.h"
 #include "exec/exec-all.h"
 #include "hw/s390x/ioinst.h"
+#include "sysemu/hw_accel.h"
 #ifndef CONFIG_USER_ONLY
 #include "sysemu/sysemu.h"
 #endif
@@ -113,6 +114,25 @@ hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
     return phys_addr;
 }
 
+static inline bool is_special_wait_psw(uint64_t psw_addr)
+{
+    /* signal quiesce */
+    return psw_addr == 0xfffUL;
+}
+
+void s390_handle_wait(S390CPU *cpu)
+{
+    if (s390_cpu_halt(cpu) == 0) {
+#ifndef CONFIG_USER_ONLY
+        if (is_special_wait_psw(cpu->env.psw.addr)) {
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+        } else {
+            qemu_system_guest_panicked(NULL);
+        }
+#endif
+    }
+}
+
 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 {
     uint64_t old_mask = env->psw.mask;
@@ -128,12 +148,7 @@ void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
     }
 
     if (mask & PSW_MASK_WAIT) {
-        S390CPU *cpu = s390_env_get_cpu(env);
-        if (s390_cpu_halt(cpu) == 0) {
-#ifndef CONFIG_USER_ONLY
-            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
-#endif
-        }
+        s390_handle_wait(s390_env_get_cpu(env));
     }
 }
 

target/s390x/internal.h

@@ -352,6 +352,7 @@ void s390_cpu_recompute_watchpoints(CPUState *cs);
 void s390x_tod_timer(void *opaque);
 void s390x_cpu_timer(void *opaque);
 void do_restart_interrupt(CPUS390XState *env);
+void s390_handle_wait(S390CPU *cpu);
 #ifndef CONFIG_USER_ONLY
 LowCore *cpu_map_lowcore(CPUS390XState *env);
 void cpu_unmap_lowcore(LowCore *lowcore);

target/s390x/kvm.c

@@ -1997,12 +1997,6 @@ static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
     return r;
 }
 
-static bool is_special_wait_psw(CPUState *cs)
-{
-    /* signal quiesce */
-    return cs->kvm_run->psw_addr == 0xfffUL;
-}
-
 static void unmanageable_intercept(S390CPU *cpu, const char *str, int pswoffset)
 {
     CPUState *cs = CPU(cpu);
@@ -2074,13 +2068,7 @@ static int handle_intercept(S390CPU *cpu)
         case ICPT_WAITPSW:
             /* disabled wait, since enabled wait is handled in kernel */
             cpu_synchronize_state(cs);
-            if (s390_cpu_halt(cpu) == 0) {
-                if (is_special_wait_psw(cs)) {
-                    qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
-                } else {
-                    qemu_system_guest_panicked(NULL);
-                }
-            }
+            s390_handle_wait(cpu);
             r = EXCP_HALTED;
             break;
         case ICPT_CPU_STOP: