Re: [PATCH v8 3/8] target/riscv: Add support for IOPMP

[Alistair Francis <alistair23@gmail.com>]

On Mon, Jul 15, 2024 at 7:58 PM Ethan Chen via <qemu-devel@nongnu.org> wrote:
>
> Signed-off-by: Ethan Chen <ethan84@andestech.com>

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

Alistair

> ---
>  target/riscv/cpu_cfg.h    |  2 ++
>  target/riscv/cpu_helper.c | 18 +++++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
> index fb7eebde52..2946fec20c 100644
> --- a/target/riscv/cpu_cfg.h
> +++ b/target/riscv/cpu_cfg.h
> @@ -164,6 +164,8 @@ struct RISCVCPUConfig {
>      bool pmp;
>      bool debug;
>      bool misa_w;
> +    bool iopmp;
> +    uint32_t iopmp_rrid;
>
>      bool short_isa_string;
>
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index 6709622dd3..c2d6a874da 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -1418,9 +1418,21 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>      }
>
>      if (ret == TRANSLATE_SUCCESS) {
> -        tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1),
> -                     prot, mmu_idx, tlb_size);
> -        return true;
> +        if (cpu->cfg.iopmp) {
> +            /*
> +             * Do not align address on early stage because IOPMP needs origin
> +             * address for permission check.
> +             */
> +            tlb_set_page_with_attrs(cs, address, pa,
> +                                    (MemTxAttrs)
> +                                        {
> +                                          .requester_id = cpu->cfg.iopmp_rrid,
> +                                        },
> +                                    prot, mmu_idx, tlb_size);
> +        } else {
> +            tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1),
> +                         prot, mmu_idx, tlb_size);
> +        }
>      } else if (probe) {
>          return false;
>      } else {
> --
> 2.34.1
>
>