linux-kernel - Re: [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

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Message-ID: <28b5713f-6379-ef36-5139-6c3f0cbf27e8@huawei.com>
Date:   Sat, 8 Oct 2022 14:37:31 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Russell King <linux@...linux.org.uk>,
        Ard Biesheuvel <ardb@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

Sorry, forget to Cc Ard and efi maillist, do it now.

On 2022/9/30 18:10, Kefeng Wang wrote:
> UEFI runtime page tables dump only for ARM64 at present,
> but ARM support EFI and ARM_PTDUMP_DEBUGFS now. Since
> ARM could potentially execute with a 1G/3G user/kernel
> split, choosing 1G as the upper limit for UEFI runtime
> end, with this, we could enable UEFI runtime page tables.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> v2: update upper limit for ARM, only build test due to
>      my qemu without UEFI boot support.
>   arch/arm/include/asm/ptdump.h      | 1 +
>   arch/arm64/include/asm/ptdump.h    | 1 +
>   drivers/firmware/efi/arm-runtime.c | 4 ++--
>   3 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
> index 0c2d3d0d4cc6..aad1d034136c 100644
> --- a/arch/arm/include/asm/ptdump.h
> +++ b/arch/arm/include/asm/ptdump.h
> @@ -21,6 +21,7 @@ struct ptdump_info {
>   
>   void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
>   #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
> +#define EFI_RUNTIME_MAP_END	SZ_1G
>   void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
>   #else
>   static inline void ptdump_debugfs_register(struct ptdump_info *info,
> diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
> index b1dd7ecff7ef..581caac525b0 100644
> --- a/arch/arm64/include/asm/ptdump.h
> +++ b/arch/arm64/include/asm/ptdump.h
> @@ -23,6 +23,7 @@ struct ptdump_info {
>   
>   void ptdump_walk(struct seq_file *s, struct ptdump_info *info);
>   #ifdef CONFIG_PTDUMP_DEBUGFS
> +#define EFI_RUNTIME_MAP_END	DEFAULT_MAP_WINDOW_64
>   void __init ptdump_debugfs_register(struct ptdump_info *info, const char *name);
>   #else
>   static inline void ptdump_debugfs_register(struct ptdump_info *info,
> diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
> index 3359ae2adf24..8f8ae479061b 100644
> --- a/drivers/firmware/efi/arm-runtime.c
> +++ b/drivers/firmware/efi/arm-runtime.c
> @@ -25,14 +25,14 @@
>   #include <asm/mmu.h>
>   #include <asm/pgalloc.h>
>   
> -#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
> +#if defined(CONFIG_PTDUMP_DEBUGFS) || defined(CONFIG_ARM_PTDUMP_DEBUGFS)
>   #include <asm/ptdump.h>
>   
>   static struct ptdump_info efi_ptdump_info = {
>   	.mm		= &efi_mm,
>   	.markers	= (struct addr_marker[]){
>   		{ 0,				"UEFI runtime start" },
> -		{ DEFAULT_MAP_WINDOW_64,	"UEFI runtime end" },
> +		{ EFI_RUNTIME_MAP_END,		"UEFI runtime end" },
>   		{ -1,				NULL }
>   	},
>   	.base_addr	= 0,