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

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Date:	Sat, 11 Jun 2011 00:03:59 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	Jim Bos <jim876@...all.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: 2.6.39.1 immediately reboots/resets on EFI system

On Fri, Jun 10, 2011 at 03:58:06PM -0700, Yinghai Lu wrote:

> the problem is : overlapping between kernel code with boot services code.

SHouldn't checking against the iomem resource map avoid that?

> now e820 table that is passed from bootloader do not include boot services code range. and also current boot/head_64.S will not
> try to find usable range for decompressed kernel ( too early )...
> 
> So solution will be:
> 1. revert Matthew Garrett's patch, because it breaking unknown good platform.

That's acceptable if we can't find a better solution.

> 2. ask vendor of system that Matthew try to fix to go back fix their firmware. otherwise user have stay with CSM with it.

This isn't an option.

The medium-term fix is to ensure that the bootloaders don't put the 
kernel on top of boot services code. The long-term fix is to perform the 
SetVirtualAddressMap transition in either the bootloader or the kernel 
entry point. But the short-term fix here is to allocate all boot 
services regions that don't overlap with the kernel. That'll fix some 
number of machines and shouldn't break any existing ones.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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