diff --git a/qemu/target-arm/helper.c b/qemu/target-arm/helper.c
index 7ad64ab5..9d14142c 100644
--- a/qemu/target-arm/helper.c
+++ b/qemu/target-arm/helper.c
@@ -696,8 +696,10 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
          * supported if EL2 exists. The bit is UNK/SBZP when
          * EL2 is unavailable. In QEMU ARMv7, we force it to always zero
          * when EL2 is unavailable.
+         * On ARMv8, this bit is always available.
          */
-        if (arm_feature(env, ARM_FEATURE_V7)) {
+        if (arm_feature(env, ARM_FEATURE_V7) &&
+            !arm_feature(env, ARM_FEATURE_V8)) {
             valid_mask &= ~SCR_SMD;
         }
     }