Re: [PATCH] target/riscv: Backup/restore mstatus.SD bit when virtual register swapped

[Alistair Francis]

On Tue, Sep 14, 2021 at 11:37 AM <frank.chang@sifive.com> wrote:
>
> From: Frank Chang <frank.chang@sifive.com>
>
> When virtual registers are swapped, mstatus.SD bit should also be
> backed up/restored. Otherwise, mstatus.SD bit will be incorrectly kept
> across the world switches.
>
> Signed-off-by: Frank Chang <frank.chang@sifive.com>
> Reviewed-by: Vincent Chen <vincent.chen@sifive.com>

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

Alistair

> ---
>  target/riscv/cpu_helper.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index 968cb8046f4..488867b59eb 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -111,9 +111,10 @@ bool riscv_cpu_fp_enabled(CPURISCVState *env)
>
>  void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env)
>  {
> +    target_ulong sd = riscv_cpu_is_32bit(env) ? MSTATUS32_SD : MSTATUS64_SD;
>      uint64_t mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | MSTATUS_FS |
>                              MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE |
> -                            MSTATUS64_UXL;
> +                            MSTATUS64_UXL | sd;
>      bool current_virt = riscv_cpu_virt_enabled(env);
>
>      g_assert(riscv_has_ext(env, RVH));
> --
> 2.25.1
>
>