linux-kernel - Re: [PATCH 1/2] riscv: Fix early alternative patching

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Date:   Mon, 13 Feb 2023 09:22:03 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Jisheng Zhang <jszhang@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Andrew Jones <ajones@...tanamicro.com>,
        Christoph Muellner <christoph.muellner@...ll.eu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Nathan Chancellor <nathan@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] riscv: Fix early alternative patching

On Sun, Feb 12, 2023 at 10:15 AM Samuel Holland <samuel@...lland.org> wrote:
>
> Now that the text to patch is located using a relative offset from the
> alternative entry, the text address should be computed without applying
> the kernel mapping offset, both before and after VM setup.
>
> Fixes: 8d23e94a4433 ("riscv: switch to relative alternative entries")
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>
>  arch/riscv/errata/thead/errata.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
> index c0bea5c94128..1dd90a5f86f0 100644
> --- a/arch/riscv/errata/thead/errata.c
> +++ b/arch/riscv/errata/thead/errata.c
> @@ -102,9 +102,7 @@ void __init_or_module thead_errata_patch_func(struct alt_entry *begin, struct al
>
>                         /* On vm-alternatives, the mmu isn't running yet */
>                         if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
> -                               memcpy((void *)__pa_symbol(oldptr),
> -                                      (void *)__pa_symbol(altptr),
> -                                      alt->alt_len);
> +                               memcpy(oldptr, altptr, alt->alt_len);
>                         else
>                                 patch_text_nosync(oldptr, altptr, alt->alt_len);
>                 }
> --
> 2.37.4
>
Reviewed-by: Guo Ren <guoren@...nel.org>

-- 
Best Regards
 Guo Ren