linux-kernel - Re: [PATCH] intel-iommu: Work around yet another BIOS bug

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Message-Id: <1250796740.3311.2.camel@macbook.infradead.org>
Date:	Thu, 20 Aug 2009 20:32:20 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ray Lee <ray-lk@...rabbit.org>
Cc:	torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Faidon Liambotis <paravoid@...ian.org>,
	Matt Domsch <Matt_Domsch@...l.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, bero@...linux.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel-iommu: Work around yet another BIOS bug

On Thu, 2009-08-20 at 12:29 -0700, Ray Lee wrote:
> Think about changing this to a warning that "Your IOMMU appears to be
> disabled." All ones is, after all, the traditional hint that the
> device is turned off.

Hints are all very well, but the BIOS provided an ACPI table explicitly
telling us that there was an active IOMMU at this location.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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