diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 39a9234ff2..c8cf0ab417 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1136,6 +1136,7 @@ struct ArchCPU {
 
     /* Used to set the maximum vector length the cpu will support.  */
     uint32_t sve_max_vq;
+    uint32_t sme_max_vq;
 
 #ifdef CONFIG_USER_ONLY
     /* Used to set the default vector length at process start. */
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 77e7c4a6a5..bd33d6cc6e 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -363,6 +363,7 @@ void arm_cpu_sme_finalize(ARMCPU *cpu, Error **errp)
     }
 
     cpu->sme_vq.map = vq_map;
+    cpu->sme_max_vq = 32 - clz32(vq_map);
 }
 
 static bool cpu_arm_get_sme(Object *obj, Error **errp)