Message-ID: <1389473982.2537.84.camel@joe-AO722>
Subject: Re: [PATCH 1/4] x86, ptdump: Add the functionality to dump an
 arbitrary pagetable
From: Joe Perches <joe@perches.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Linux EFI <linux-efi@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Borislav Petkov <bp@suse.de>, Arjan van de Ven <arjan@linux.intel.com>,
        Matt Fleming <matt@console-pimps.org>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Dave Young <dyoung@redhat.com>,
        Toshi Kani <toshi.kani@hp.com>
Date: Sat, 11 Jan 2014 12:59:42 -0800
In-Reply-To: <1389473370-1940-2-git-send-email-bp@alien8.de>
References: <1389473370-1940-1-git-send-email-bp@alien8.de>
	 <1389473370-1940-2-git-send-email-bp@alien8.de>
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Sender: linux-kernel-owner@vger.kernel.org

On Sat, 2014-01-11 at 21:49 +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> 
> With reusing the ->trampoline_pgd page table for mapping EFI regions in
> order to use them after having switched to EFI virtual mode, it is very
> useful to be able to dump aforementioned page table in dmesg. This adds
> that functionality through the walk_pgd_level() interface which can be
> called from somewhere else.
[]
> diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
[]
> @@ -306,6 +326,11 @@ static void walk_pgd_level(struct seq_file *m)
>  	int i;
>  	struct pg_state st;
>  
> +	if (pgd) {
> +		start = pgd;
> +		dump_to_dmesg = true;
> +	}

	else
		dump_to_dmesg = false;

?


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