linux-kernel - Re: 2.6.39.1 immediately reboots/resets on EFI system

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Message-ID: <4DEFCF1A.9030400@kernel.org>
Date:	Wed, 08 Jun 2011 12:35:54 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Jim Bos <jim876@...all.nl>, "H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.39.1 immediately reboots/resets on EFI system

On 06/08/2011 12:29 PM, Matthew Garrett wrote:
> On Wed, Jun 08, 2011 at 12:27:03PM -0700, Yinghai Lu wrote:
>> On 06/08/2011 12:23 PM, Matthew Garrett wrote:
>>> On Wed, Jun 08, 2011 at 12:17:52PM -0700, Yinghai Lu wrote:
>>>> we need to revert patch from mjg.
>>>>
>>>> From 916f676f8dc016103f983c7ec54c18ecdbb6e349 Mon Sep 17 00:00:00 2001
>>>> From: Matthew Garrett <mjg@...hat.com>
>>>> Date: Wed, 25 May 2011 09:53:13 -0400
>>>> Subject: [PATCH] x86, efi: Retain boot service code until after switching to
>>>>  virtual mode
>>>
>>> That's not a long-term option, since we have no way to distinguish 
>>> between a machine that requires boot services code to be mapped and a 
>>> machine that doesn't. Reverting just breaks the former set again. 
>>
>> what former? you can not fix some corner case by breaking most other cases.
> 
> All Dell laptops, all new Apples, some Lenovos, various Intel server 
> platforms. That I've found so far.

do you mean before that patch, all those machine will not boot linux kernel with UEFI support?

> 
>>> We need to ensure that the kernel isn't overlapping boot services code.
>>
>> bootloader will put kernel from 16M, and boot services are on those area already.
> 
> And we need to be able to map the boot services code, so we can't put 
> the kernel on top of it.

after bootloader, those area should be free already.

Yinghai

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