linux-kernel - Re: [PATCH v3 2/6] arm64/mirror: arm64 enabling

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Date:   Fri, 10 Jun 2022 17:27:31 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Wupeng Ma <mawupeng1@...wei.com>, <corbet@....net>,
        <will@...nel.org>, <ardb@...nel.org>, <catalin.marinas@....com>
CC:     <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>,
        <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 v3 2/6] arm64/mirror: arm64 enabling - find mirrored
 memory ranges


On 2022/6/7 17:38, Wupeng Ma 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.

Move into efi_init() looks better, it won't bring negative effects on 
arm/riscv.

but let's maintainer to make a decision.

Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>

>
> Signed-off-by: Ma Wupeng <mawupeng1@...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!");