[PATCH] target/riscv/csr.c: Turn off mstatus.vs when misa.v is turned off

[Evgenii Prokopiev]

A behavior of misa.v must be similar as misa.f.
So when this bit's field is turned off, mstatus.vs must be turned off
too. It follows from the privileged manual of RISC-V, paragraph 3.1.1.
"Machine ISA (misa) Register".

Signed-off-by: Evgenii Prokopiev <evgenii.prokop...@syntacore.com>
---
 target/riscv/csr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index eab8e50012..fca2b1b40f 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -1537,6 +1537,10 @@ static RISCVException write_misa(CPURISCVState *env, int 
csrno,
         env->mstatus &= ~MSTATUS_FS;
     }
 
+    if (!(env->misa_ext & RVV)) {
+        env->mstatus &= ~MSTATUS_VS;
+    }
+
     /* flush translation cache */
     tb_flush(env_cpu(env));
     env->xl = riscv_cpu_mxl(env);
-- 
2.34.1