SXL is initialized as env->misa_mxl which is also the mxl value.
So we can just remain it unchanged to keep it read-only.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
---
 target/riscv/csr.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 6ac11d1f11..25345f3153 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -1321,10 +1321,6 @@ static RISCVException write_mstatus(CPURISCVState *env, int csrno,
 
     mstatus = (mstatus & ~mask) | (val & mask);
 
-    if (xl > MXL_RV32) {
-        /* SXL field is for now read only */
-        mstatus = set_field(mstatus, MSTATUS64_SXL, xl);
-    }
     env->mstatus = mstatus;
 
     /*
-- 
2.25.1

On 2023/5/29 20:17, Weiwei Li wrote:
> SXL is initialized as env->misa_mxl which is also the mxl value.
> So we can just remain it unchanged to keep it read-only.
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
> ---
>   target/riscv/csr.c | 4 ----
>   1 file changed, 4 deletions(-)
>
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 6ac11d1f11..25345f3153 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -1321,10 +1321,6 @@ static RISCVException write_mstatus(CPURISCVState *env, int csrno,
>   
>       mstatus = (mstatus & ~mask) | (val & mask);
>   
> -    if (xl > MXL_RV32) {
> -        /* SXL field is for now read only */
> -        mstatus = set_field(mstatus, MSTATUS64_SXL, xl);
> -    }

Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>

Zhiwei

>       env->mstatus = mstatus;
>   
>       /*

On Mon, May 29, 2023 at 10:18 PM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> SXL is initialized as env->misa_mxl which is also the mxl value.
> So we can just remain it unchanged to keep it read-only.
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>

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

Alistair

> ---
>  target/riscv/csr.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 6ac11d1f11..25345f3153 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -1321,10 +1321,6 @@ static RISCVException write_mstatus(CPURISCVState *env, int csrno,
>
>      mstatus = (mstatus & ~mask) | (val & mask);
>
> -    if (xl > MXL_RV32) {
> -        /* SXL field is for now read only */
> -        mstatus = set_field(mstatus, MSTATUS64_SXL, xl);
> -    }
>      env->mstatus = mstatus;
>
>      /*
> --
> 2.25.1
>
>

On 5/29/23 09:17, Weiwei Li wrote:
> SXL is initialized as env->misa_mxl which is also the mxl value.
> So we can just remain it unchanged to keep it read-only.
> 
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
> ---

Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

>   target/riscv/csr.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 6ac11d1f11..25345f3153 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -1321,10 +1321,6 @@ static RISCVException write_mstatus(CPURISCVState *env, int csrno,
>   
>       mstatus = (mstatus & ~mask) | (val & mask);
>   
> -    if (xl > MXL_RV32) {
> -        /* SXL field is for now read only */
> -        mstatus = set_field(mstatus, MSTATUS64_SXL, xl);
> -    }
>       env->mstatus = mstatus;
>   
>       /*