Re: [PATCH] arm64: mm: fault: replace the behavior of fault_info[18]

[Leesoo Ahn]

I just figured out that do_sea(..) isn't the right function to deal
with VMSAv9-128.
Please ignore this patch.

BR
Leesoo

2024년 12월 14일 (토) 오후 6:20, Leesoo Ahn <lsahn@xxxxxxxxxx>님이 작성:
>
> Replace the behavior of 18th element of fault_info with the 'fn' member to
> do_sea(..) and 'name' to 'level -2 (translation table walk)' based on
> the information[1] of the latest reference manual[2].
>
> The information has described in the chapter, D24.2.40 of [2] and
> DFSC[5:0] bit (stands for Data Fault Status Code).
>
> [1]: Synchronous External abort on translation table walk, level -2
> [2]: Arm Architecture Reference Manual, for A-profile architecture
>
> Signed-off-by: Leesoo Ahn <lsahn@xxxxxxxxxx>
> ---
>  arch/arm64/mm/fault.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index ef63651099a9..b1c08289a5cc 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -863,7 +863,7 @@ static const struct fault_info fault_info[] = {
>         { do_page_fault,        SIGSEGV, SEGV_ACCERR,   "level 3 permission fault"      },
>         { do_sea,               SIGBUS,  BUS_OBJERR,    "synchronous external abort"    },
>         { do_tag_check_fault,   SIGSEGV, SEGV_MTESERR,  "synchronous tag check fault"   },
> -       { do_bad,               SIGKILL, SI_KERNEL,     "unknown 18"                    },
> +       { do_sea,               SIGKILL, SI_KERNEL,     "level -2 (translation table walk)"     },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level -1 (translation table walk)"     },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level 0 (translation table walk)"      },
>         { do_sea,               SIGKILL, SI_KERNEL,     "level 1 (translation table walk)"      },
> --
> 2.46.1
>