Re: [PATCH v13 23/26] target/riscv: add satp_mode profile support

[Alistair Francis]

On Mon, Dec 18, 2023 at 10:56 PM Daniel Henrique Barboza
<dbarboza@ventanamicro.com> wrote:
>
> 'satp_mode' is a requirement for supervisor profiles like RVA22S64.
> User-mode/application profiles like RVA22U64 doesn't care.
>
> Add 'satp_mode' to the profile description. If a profile requires it,
> set it during cpu_set_profile(). We'll also check it during finalize()
> to validate if the running config implements the profile.
>
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

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

Alistair

> ---
>  target/riscv/cpu.c         |  1 +
>  target/riscv/cpu.h         |  1 +
>  target/riscv/tcg/tcg-cpu.c | 40 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 42 insertions(+)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 1dea5db52d..6795f5da41 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -1543,6 +1543,7 @@ static RISCVCPUProfile RVA22U64 = {
>      .name = "rva22u64",
>      .misa_ext = RVI | RVM | RVA | RVF | RVD | RVC | RVU,
>      .priv_spec = RISCV_PROFILE_ATTR_UNUSED,
> +    .satp_mode = RISCV_PROFILE_ATTR_UNUSED,
>      .ext_offsets = {
>          CPU_CFG_OFFSET(ext_zicsr), CPU_CFG_OFFSET(ext_zihintpause),
>          CPU_CFG_OFFSET(ext_zba), CPU_CFG_OFFSET(ext_zbb),
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index 485d2da3c2..6c5fceb5f5 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -82,6 +82,7 @@ typedef struct riscv_cpu_profile {
>      bool enabled;
>      bool user_set;
>      int priv_spec;
> +    int satp_mode;
>      const int32_t ext_offsets[];
>  } RISCVCPUProfile;
>
> diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
> index 4d25fc43d2..152f95718b 100644
> --- a/target/riscv/tcg/tcg-cpu.c
> +++ b/target/riscv/tcg/tcg-cpu.c
> @@ -766,6 +766,31 @@ void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, 
> Error **errp)
>      riscv_cpu_disable_priv_spec_isa_exts(cpu);
>  }
>
> +#ifndef CONFIG_USER_ONLY
> +static bool riscv_cpu_validate_profile_satp(RISCVCPU *cpu,
> +                                            RISCVCPUProfile *profile,
> +                                            bool send_warn)
> +{
> +    int satp_max = satp_mode_max_from_map(cpu->cfg.satp_mode.supported);
> +
> +    if (profile->satp_mode > satp_max) {
> +        if (send_warn) {
> +            bool is_32bit = riscv_cpu_is_32bit(cpu);
> +            const char *req_satp = satp_mode_str(profile->satp_mode, 
> is_32bit);
> +            const char *cur_satp = satp_mode_str(satp_max, is_32bit);
> +
> +            warn_report("Profile %s requires satp mode %s, "
> +                        "but satp mode %s was set", profile->name,
> +                        req_satp, cur_satp);
> +        }
> +
> +        return false;
> +    }
> +
> +    return true;
> +}
> +#endif
> +
>  static void riscv_cpu_validate_profile(RISCVCPU *cpu,
>                                         RISCVCPUProfile *profile)
>  {
> @@ -775,6 +800,13 @@ static void riscv_cpu_validate_profile(RISCVCPU *cpu,
>      bool profile_impl = true;
>      int i;
>
> +#ifndef CONFIG_USER_ONLY
> +    if (profile->satp_mode != RISCV_PROFILE_ATTR_UNUSED) {
> +        profile_impl = riscv_cpu_validate_profile_satp(cpu, profile,
> +                                                       send_warn);
> +    }
> +#endif
> +
>      if (profile->priv_spec != RISCV_PROFILE_ATTR_UNUSED &&
>          profile->priv_spec != env->priv_ver) {
>          profile_impl = false;
> @@ -1079,6 +1111,14 @@ static void cpu_set_profile(Object *obj, Visitor *v, 
> const char *name,
>          cpu->env.priv_ver = profile->priv_spec;
>      }
>
> +#ifndef CONFIG_USER_ONLY
> +    if (profile->satp_mode != RISCV_PROFILE_ATTR_UNUSED) {
> +        const char *satp_prop = satp_mode_str(profile->satp_mode,
> +                                              riscv_cpu_is_32bit(cpu));
> +        object_property_set_bool(obj, satp_prop, profile->enabled, NULL);
> +    }
> +#endif
> +
>      for (i = 0; misa_bits[i] != 0; i++) {
>          uint32_t bit = misa_bits[i];
>
> --
> 2.43.0
>
>