linux-kernel - Re: [PATCH] romsignature/checksum cleanup

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Message-ID: <459ABA2F.6070907@gmail.com>
Date:	Tue, 02 Jan 2007 21:01:51 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	Zachary Amsden <zach@...are.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH] romsignature/checksum cleanup

Zachary Amsden wrote:

>> Rusty Russell wrote:
>> 
>>> Rene Herman wrote:
>>> 
>>> Hmm, by the way, if romsignature() needs this
>>> probe_kernel_address() thing, why doesn't romchecksum()?
>> 
>> I assume it's all in the same page, but CC'ing Zach is easier than 
>> reading the code 8)
>> 
> 
> Some hypervisors don't emulate the traditional physical layout of the
> first 1M of memory, so those pages might never get physical mappings
> established during the boot process, causing access to them to
> fault. Presumably, if the first page is there with a good signature,
> the entire ROM is mapped.  I think Jeremy added this for Xen, and
> it's harmless on native hardware.

Jeremy? Is it okay to only check the signature word? The checksum will 
generally be done over more than 1 (hw) page... That "presumably" there 
seems a bit flaky?

Rene.
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