1 files changed, 11 insertions, 1 deletions
diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 5dc1c10..b41c29d 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -35,7 +35,7 @@
 #include <math.h>
 
 target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong s1,
-                            target_ulong s2)
+                            target_ulong s2, target_ulong x0)
 {
     int vlmax, vl;
     RISCVCPU *cpu = env_archcpu(env);
@@ -83,6 +83,16 @@ target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong s1,
     } else {
         vl = vlmax;
     }
+
+    if (cpu->cfg.rvv_vsetvl_x0_vill && x0 && (env->vl != vl)) {
+        /* only set vill bit. */
+        env->vill = 1;
+        env->vtype = 0;
+        env->vl = 0;
+        env->vstart = 0;
+        return 0;
+    }
+
     env->vl = vl;
     env->vtype = s2;
     env->vstart = 0;