linux-kernel - Re: [PATCH V2] x86/efi: Add EFI_PGT_DUMP support for x86

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Message-ID: <20170515142729.GE2935@codeblueprint.co.uk>
Date:   Mon, 15 May 2017 15:27:29 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Ricardo Neri <ricardo.neri@...el.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Ravi Shankar <ravi.v.shankar@...el.com>
Subject: Re: [PATCH V2] x86/efi: Add EFI_PGT_DUMP support for x86_32, kexec

On Thu, 11 May, at 12:20:33PM, Sai Praneeth Prakhya wrote:
> From: Sai Praneeth <sai.praneeth.prakhya@...el.com>
> 
> EFI_PGT_DUMP, as the name suggests dumps efi page tables to dmesg during
> kernel boot. This feature is very useful while debugging page
> faults/null pointer dereferences to efi related addresses. Presently,
> this feature is limited only to x86_64, so let's extend it to other efi
> configurations like kexec kernel, efi=old_map and to x86_32 as well.
> This doesn't effect normal boot path because this config option should
> be used only for debug purposes.
> 
> Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Ricardo Neri <ricardo.neri@...el.com>
> Cc: Matt Fleming <matt@...eblueprint.co.uk>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Ravi Shankar <ravi.v.shankar@...el.com>
> 
> Changes since v1:
> 1. Call efi_dump_pagetable() only once from efi_enter_virtual_mode() -
> as suggested by Boris
> 
> ---
>  arch/x86/platform/efi/efi.c    | 3 ++-
>  arch/x86/platform/efi/efi_32.c | 9 ++++++++-
>  arch/x86/platform/efi/efi_64.c | 5 ++++-
>  3 files changed, 14 insertions(+), 3 deletions(-)

Thanks Sai, applied.