linux-kernel - Re: [PATCH 2/5] efi: Dump the EFI page table

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Date:	Mon, 20 Jan 2014 13:38:02 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Linux EFI <linux-efi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>, Toshi Kani <toshi.kani@...com>
Subject: Re: [PATCH 2/5] efi: Dump the EFI page table

On Sat, 18 Jan, at 12:48:15PM, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> This is very useful for debugging issues with the recently added
> pagetable switching code for EFI virtual mode.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Tested-by: Toshi Kani <toshi.kani@...com>
> ---
>  arch/x86/Kconfig               | 9 +++++++++
>  arch/x86/include/asm/efi.h     | 1 +
>  arch/x86/platform/efi/efi.c    | 1 +
>  arch/x86/platform/efi/efi_32.c | 1 +
>  arch/x86/platform/efi/efi_64.c | 9 +++++++++
>  5 files changed, 21 insertions(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 02241d8dcab6..ba0d86cca926 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1614,6 +1614,15 @@ config EFI_STUB
>  
>  	  See Documentation/efi-stub.txt for more information.
>  
> +config EFI_PGT_DUMP
> +	bool "Dump the EFI pagetable"
> +	depends on EFI && X86_PTDUMP
> +	---help---
> +	  Enable this if you want to dump the EFI page table before
> +	  enabling virtual mode. This can be used to debug miscellaneous
> +	  issues with the mapping of the EFI runtime regions into that
> +	  table.
> +

Would this be more suitable in arch/x86/Kconfig.debug?

-- 
Matt Fleming, Intel Open Source Technology Center
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