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

[Alistair Francis <alistair23@gmail.com>]

On Tue, Feb 1, 2022 at 5:08 PM LIU Zhiwei <zhiwei_liu@c-sky.com> wrote:
>
> 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>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  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
>
>