linux-kernel - Re: [PATCH 1/3] AMD x86 quirks: Quirk for enabling IOMMUv2 PC feature

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Message-ID: <20130128142928.GZ25591@8bytes.org>
Date:	Mon, 28 Jan 2013 15:29:28 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	"Steven L. Kinney" <steven.kinney@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Myron Stowe <myron.stowe@...hat.com>,
	Hiroshi DOYU <hdoyu@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Renninger <trenn@...e.de>,
	Andi Kleen <ak@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 1/3] AMD x86 quirks: Quirk for enabling IOMMUv2 PC feature

On Mon, Jan 21, 2013 at 02:20:56PM -0600, Steven L. Kinney wrote:
> From: "Steven L. Kinney" <steven.kinney@....com>
> 
> Original code base by Andreas Herrmann at AMD with minor changes.

Why is it safe to enable this feature when it was disabled by BIOS? Was
it disabled for no reason?


	Joerg

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