target: arm: cpu64: HACK: enable all features on max cpu

XNU needs the ARMv8.1 atomics instructions.

Author: zhuowei

target/arm/cpu64.c

@@ -230,7 +230,7 @@ static void aarch64_max_initfn(Object *obj)
         kvm_arm_set_cpu_features_from_host(cpu);
     } else {
         aarch64_a57_initfn(obj);
-#ifdef CONFIG_USER_ONLY
+//#ifdef CONFIG_USER_ONLY
         /* We don't set these in system emulation mode for the moment,
          * since we don't correctly set the ID registers to advertise them,
          * and in some cases they're only available in AArch64 and not AArch32,
@@ -247,6 +247,7 @@ static void aarch64_max_initfn(Object *obj)
         set_feature(&cpu->env, ARM_FEATURE_V8_FP16);
         set_feature(&cpu->env, ARM_FEATURE_V8_FCMA);
         set_feature(&cpu->env, ARM_FEATURE_SVE);
+#ifdef CONFIG_USER_ONLY
         /* For usermode -cpu max we can use a larger and more efficient DCZ
          * blocksize since we don't have to follow what the hardware does.
          */