linux-kernel - Re: [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel.

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Message-ID: <20080228094613.GC2987@elte.hu>
Date:	Thu, 28 Feb 2008 10:46:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Mark McLoughlin <markmc@...hat.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: Re: [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel.


* Ian Campbell <ijc@...lion.org.uk> wrote:

> Actually scratch this patchset -- its not sufficient. For example 
> ddcprobe in userspace causes the exact same issue vs 0xa0000.
> 
> Looks like the only sane solution will be to mark regions between 
> 640K-1M reserved early on in boot.

and as luck has it, such a patch from Alexander van Heukelum has been 
put into x86.git#testing just yesterday.

So ... could you try x86.git#testing - does it work out of box? Is the 
reservation early enough to prevent pagetables be allocated in weird 
places? [or am i missing something - this is about the guest kernel 
reserving th 640k..1M area, not the host kernel - right?]

	Ingo
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