Re: [PATCH v2 3/6] target/riscv: Set VS* bits to one in mideleg when H-Ext is enabled

[Alistair Francis]

On Sat, May 27, 2023 at 2:24 AM Rajnesh Kanwal <rkanwal@rivosinc.com> wrote:
>
> With H-Ext supported, VS bits are all hardwired to one in MIDELEG
> denoting always delegated interrupts. This is being done in rmw_mideleg
> but given mideleg is used in other places when routing interrupts
> this change initializes it in riscv_cpu_realize to be on the safe side.
>
> Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com>

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

Alistair

> ---
>  target/riscv/cpu.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index db0875fb43..269a094f42 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -1280,6 +1280,11 @@ static void riscv_cpu_realize(DeviceState *dev, Error 
> **errp)
>                                            riscv_pmu_timer_cb, cpu);
>          }
>       }
> +
> +    /* With H-Ext, VSSIP, VSTIP, VSEIP and SGEIP are hardwired to one. */
> +    if (riscv_has_ext(env, RVH)) {
> +        env->mideleg = MIP_VSSIP | MIP_VSTIP | MIP_VSEIP | MIP_SGEIP;
> +    }
>  #endif
>
>      riscv_cpu_finalize_features(cpu, &local_err);
> --
> 2.25.1
>
>