linux-kernel - Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address is invalid

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Message-ID: <4EB8436B.20603@zytor.com>
Date:	Mon, 07 Nov 2011 12:45:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Zhang Rui <rui.zhang@...el.com>,
	Huang Ying <huang.ying.caritas@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address
 is invalid

On 11/07/2011 12:37 PM, Matthew Garrett wrote:
> On Mon, Nov 07, 2011 at 12:36:13PM -0800, H. Peter Anvin wrote:
> 
>> Yes, I think it makes a lot of sense.  If we need to introduce new
>> meta-types to deal with the fact that there are EFI types that don't map
>> to E820, then so be it... and this is *exactly* why we want the EFI
>> setup stub to be part of the kernel image and not off in a separate
>> bootloader, requiring a stable interface...
> 
> I don't disagree, it's just going to be an absolute pain to manage that 
> in a secure boot world.

Could you clarify, please?

> Looking at the code, we actually already seem to 
> have decided to start just making up E820 types, so maybe we should just 
> do that... 

That's what I just said, no?  I think we use negative numbers for those.

	-hpa

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