linux-kernel - Re: [PATCH v4 2/6] arm64/mirror: arm64 enabling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMj1kXEWRXKZdLz3C2MofKXgx6yadSOQru979brm3r_sgBdMgw@mail.gmail.com>
Date:   Mon, 13 Jun 2022 11:41:17 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Wupeng Ma <mawupeng1@...wei.com>
Cc:     corbet@....net, will@...nel.org, catalin.marinas@....com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        dvhart@...radead.org, andy@...radead.org, rppt@...nel.org,
        akpm@...ux-foundation.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, paulmck@...nel.org,
        keescook@...omium.org, songmuchun@...edance.com,
        rdunlap@...radead.org, damien.lemoal@...nsource.wdc.com,
        swboyd@...omium.org, wei.liu@...nel.org, robin.murphy@....com,
        david@...hat.com, anshuman.khandual@....com,
        thunder.leizhen@...wei.com, wangkefeng.wang@...wei.com,
        gpiccoli@...lia.com, chenhuacai@...nel.org, geert@...ux-m68k.org,
        vijayb@...ux.microsoft.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 2/6] arm64/mirror: arm64 enabling - find mirrored
 memory ranges

On Mon, 13 Jun 2022 at 10:00, Wupeng Ma <mawupeng1@...wei.com> wrote:
>
> From: Ma Wupeng <mawupeng1@...wei.com>
>
> Commit b05b9f5f9dcf ("x86, mirror: x86 enabling - find mirrored memory ranges")
> introduced mirrored memory support for x86 and this could be used on arm64.
>
> Since we only support this feature on arm64, efi_find_mirror() won't be placed
> into efi_init(), which is used by riscv/arm/arm64, it is added in setup_arch()
> to scan the memory map and mark mirrored memory in memblock.
>
> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
> Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 2 +-
>  arch/arm64/kernel/setup.c                       | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 8090130b544b..e3537646b6f7 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2301,7 +2301,7 @@
>
>         keepinitrd      [HW,ARM]
>
> -       kernelcore=     [KNL,X86,IA-64,PPC]
> +       kernelcore=     [KNL,X86,IA-64,PPC,ARM64]
>                         Format: nn[KMGTPE] | nn% | "mirror"
>                         This parameter specifies the amount of memory usable by
>                         the kernel for non-movable allocations.  The requested
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index cf3a759f10d4..6e9acd7ecf0f 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -328,6 +328,7 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
>
>         xen_early_init();
>         efi_init();
> +       efi_find_mirror();
>
>         if (!efi_enabled(EFI_BOOT) && ((u64)_text % MIN_KIMG_ALIGN) != 0)
>              pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");

As suggested by Kefeng Wang, I think this call needs to be moved into
efi_init() [the generic version]

Please drop this hunk, and add this call to efi_init() in patch #1.