linux-kernel - Re: BUG() at boot in __phys_addr with DEBUG

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Date:	Thu, 13 Nov 2014 10:36:33 +0000
From:	Matt Fleming <matt.fleming@...el.com>
To:	Borislav Petkov <bp@...e.de>
CC:	Dave Hansen <dave.hansen@...el.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG() at boot in __phys_addr with DEBUG_VIRTUAL

On Wed, 2014-11-12 at 18:25 +0100, Borislav Petkov wrote:
> 
> But before we do that: Matt, why do we need the kernel text mapped 1:1
> in the EFI page table at all?
> 
> You've added this with
> 
> 4f9dbcfc4029 ("x86/efi: Add mixed runtime services support")

So that when we switch into 32-bit mode we can still access the kernel
text via the 1:1 mapping in protected mode.

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