[PATCH] target/riscv: Fix vill field write in vtype

[LIU Zhiwei <zhiwei_liu@c-sky.com>]

The guest should be able to set the vill bit as part of vsetvl.

Currently we may set env->vill to 1 in the vsetvl helper, but there
is nowhere that we set it to 0, so once it transitions to 1 it's stuck
there until the system is reset.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
---
 target/riscv/vector_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 020d2e841f..3bd4aac9c9 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -71,6 +71,7 @@ target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong s1,
     env->vl = vl;
     env->vtype = s2;
     env->vstart = 0;
+    env->vill = 0;
     return vl;
 }
 
-- 
2.25.1