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From: Ingo Molnar <mingo@elte.hu>
To: Ian Campbell <ijc@hellion.org.uk>
Cc: linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	Mark McLoughlin <markmc@redhat.com>,
	Alexander van Heukelum <heukelum@fastmail.fm>
Subject: Re: [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel.
Date: Thu, 28 Feb 2008 11:44:34 +0100	[thread overview]
Message-ID: <20080228104434.GA8964@elte.hu> (raw)
In-Reply-To: <1204194923.5446.30.camel@zakaz.uk.xensource.com>


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

> > > 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?
> 
> That patch is 64 bit only and also I'm not sure what EBDA looks like 
> to a Xen domU (I expect it doesn't exist). I'll give it a go but I'm 
> not hopeful.

it was requested to be unified to 32 bit as well already - no patch yet. 
I'd gladly take a patch that does it - it fixing 32-bit Xen guests would 
be an added bonus. Perhaps this all should be done by injecting a very 
eary e820 filter instead of reserving it later on? 640k..1M being 
special is a deep PC legacy, i doubt we'll ever recover from it ;-)

	Ingo

      reply	other threads:[~2008-02-28 10:45 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28  8:26 [PATCH 1/2] x86: Add nodmi command line option to turn off DMI parsing Ian Campbell
2008-02-28  8:26 ` [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel Ian Campbell
2008-02-28  9:31   ` Ian Campbell
2008-02-28  9:46     ` Ingo Molnar
2008-02-28 10:35       ` Ian Campbell
2008-02-28 10:44         ` Ingo Molnar [this message]

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