linux-kernel - Re: [PATCH 4/4] iommu: Add option to group multi-function devices

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Message-ID: <20111201001153.GC5427@truffala.fritz.box>
Date:	Thu, 1 Dec 2011 11:11:53 +1100
From:	David Gibson <dwg@....ibm.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	joerg.roedel@....com, dwmw2@...radead.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	chrisw@...hat.com, agraf@...e.de, scottwood@...escale.com,
	B08248@...escale.com, benh@...nel.crashing.org
Subject: Re: [PATCH 4/4] iommu: Add option to group multi-function devices

On Fri, Oct 21, 2011 at 01:56:24PM -0600, Alex Williamson wrote:
> The option iommu=group_mf indicates the that the iommu driver should
> expose all functions of a multi-function PCI device as the same
> iommu_device_group.  This is useful for disallowing individual functions
> being exposed as independent devices to userspace as there are often
> hidden dependencies.  Virtual functions are not affected by this option.

This seems ok as a testing/debugging hack.  But in general, surely,
whether to group the functions should be a device quirk.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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