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

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Message-ID: <mhng-b6639b2b-fb32-4522-b5ec-63ccb8886dfe@palmerdabbelt-glaptop1>
Date:   Sun, 04 Oct 2020 16:20:40 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Atish Patra <Atish.Patra@....com>
CC:     linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
        aou@...s.berkeley.edu, Anup Patel <Anup.Patel@....com>,
        linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>, 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 Thu, 01 Oct 2020 12:04:56 PDT (-0700), Atish Patra 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)

Thanks, this is on fixes.