linux-kernel - Re: [PATCH 4/4] pci/dmar: Tone down warnings about invalid BIOS DMAR tables

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Message-ID: <alpine.LFD.2.00.1003210854310.10882@dwoodhou-mobl2.ger.corp.intel.com>
Date:	Sun, 21 Mar 2010 08:57:48 -0700 (PST)
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ben Hutchings <ben@...adent.org.uk>
cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] pci/dmar: Tone down warnings about invalid BIOS DMAR
 tables

On Sun, 21 Mar 2010, Ben Hutchings wrote:

> Are you saying that these bogus tables are found on boards that do have
> VT-d hardware?  I was working on the assumption that these tables result
> from the OEM building a BIOS with VT-d support for a board where the
> hardware is not present.

Yes. Most of these boards have VT-d but can't use it because the BIOS 
vendors fucked up and never once booted a VT-d-capable OS to test it. (And 
because the spec is bloody stupid and relies on BIOS tables rather than 
enumerating through PCI or something like that).

-- 
dwmw2

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