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From: Ian Campbell <>
To: Ingo Molnar <>
	Thomas Gleixner <>,
	Ingo Molnar <>, "H. Peter Anvin" <>,
	Jeremy Fitzhardinge <>,
	Mark McLoughlin <>,
	Alexander van Heukelum <>
Subject: Re: [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel.
Date: Thu, 28 Feb 2008 10:35:23 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thu, 2008-02-28 at 10:46 +0100, Ingo Molnar wrote:
> * Ian Campbell <> 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?

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

>  [or am i missing something - this is about the guest kernel 
> reserving th 640k..1M area, not the host kernel - right?]

Correct, the area between 640k and 1M is just normal memory for a Xen
guest and the memory map reflects that so page tables and other stuff
get allocated in regions which would be magic data structures on native.

Ian Campbell

The woman you buy -- and she is the least expensive -- takes a great
deal of money.  The woman who gives herself takes all your time.
		-- Balzac

  reply	other threads:[~2008-02-28 10:35 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 [this message]
2008-02-28 10:44         ` Ingo Molnar

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