s390x/tcg: make lura(g) use the new _real mmu.

Looks like, lurag was not loading 64bit but only 32bit.

As we properly handle the return address now, we can drop
potential_page_fault().

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170926183318.12995-4-david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

target/s390x/mem_helper.c

@@ -1959,16 +1959,12 @@ void HELPER(purge)(CPUS390XState *env)
 /* load using real address */
 uint64_t HELPER(lura)(CPUS390XState *env, uint64_t addr)
 {
-    CPUState *cs = CPU(s390_env_get_cpu(env));
-
-    return (uint32_t)ldl_phys(cs->as, wrap_address(env, addr));
+    return cpu_ldl_real_ra(env, wrap_address(env, addr), GETPC());
 }
 
 uint64_t HELPER(lurag)(CPUS390XState *env, uint64_t addr)
 {
-    CPUState *cs = CPU(s390_env_get_cpu(env));
-
-    return ldq_phys(cs->as, wrap_address(env, addr));
+    return cpu_ldq_real_ra(env, wrap_address(env, addr), GETPC());
 }
 
 /* store using real address */

target/s390x/translate.c

@@ -2967,15 +2967,13 @@ static ExitStatus op_lpq(DisasContext *s, DisasOps *o)
 static ExitStatus op_lura(DisasContext *s, DisasOps *o)
 {
     check_privileged(s);
-    potential_page_fault(s);
     gen_helper_lura(o->out, cpu_env, o->in2);
     return NO_EXIT;
 }
 
 static ExitStatus op_lurag(DisasContext *s, DisasOps *o)
 {
     check_privileged(s);
-    potential_page_fault(s);
     gen_helper_lurag(o->out, cpu_env, o->in2);
     return NO_EXIT;
 }