linux-kernel - Re: 2.6.25-rc1 xen pvops regression

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Date:	Fri, 22 Feb 2008 10:55:36 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Ian Campbell <ijc@...lion.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Joel Becker <Joel.Becker@...cle.com>,
	Jody Belka <lists-lkml@...b.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Mika Penttila <mika.penttila@...umbus.fi>
Subject: Re: 2.6.25-rc1 xen pvops regression

Alan Cox wrote:
>> I'd been meaning to ask this. So the machines you have which don't
>> describe 0xf0000 as reserved also don't describe it as RAM? (I guess
>> it's either a hole in the table or one of the other e820 types).
> 
> Making 0xf0000 bus addresses RAM is probably a bad idea anyway. Most OS's
> treat the E820 map with paranoia because we do see real PCs which
> variously claim that the BIOS ROM space is RAM, ACPI, Reserved or just
> forget to mention it. 

Actually I switched 64bit over to trust e820 completely and not
reserve 640k-1MB explicitly some time ago
and AFAIK there hasn't been any reports that it causes problems.

So presumably trusting e802 is ok on modern systems (2003+)

-Andi
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