linux-kernel - Re: [PATCH] RISC-V: Make sure memblock reserves the memory containing DT

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Date:   Fri, 2 Oct 2020 15:41:57 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atish.patra@....com>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup.patel@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Zong Li <zong.li@...ive.com>,
        Alistair Francis <Alistair.Francis@....com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] RISC-V: Make sure memblock reserves the memory containing DT

On Fri, Oct 2, 2020 at 12:35 AM Atish Patra <atish.patra@....com> wrote:
>
> Currently, the memory containing DT is not reserved. Thus, that region
> of memory can be reallocated or reused for other purposes. This may result
> in  corrupted DT for nommu virt board in Qemu. We may not face any issue
> in kendryte as DT is embedded in the kernel image for that.
>
> Fixes: 6bd33e1ece52 ("riscv: add nommu support")
> Signed-off-by: Atish Patra <atish.patra@....com>
>
> ---
> @Palmer This patch is applicable for v5.9 & before. This fix is already
> part of the "RISC-V: Move DT mapping outof fixmap" patch from UEFI support
> series. That's why, this patch doesn't need to go into for-next.
> ---
>  arch/riscv/mm/init.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 564e0be677b7..cabf1697e748 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -510,6 +510,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>  #else
>         dtb_early_va = (void *)dtb_pa;
>  #endif
> +       dtb_early_pa = dtb_pa;
>  }
>
>  static inline void setup_vm_final(void)
> --
> 2.25.1
>

Looks good to me.

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup