linux-kernel - Re: [RESEND PATCH v2] iommu/intel: Exclude devices using RMRRs from IOMMU API domains

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Message-ID: <20140729154417.GB27589@8bytes.org>
Date:	Tue, 29 Jul 2014 17:44:17 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
	chegu_vinod@...com, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2] iommu/intel: Exclude devices using RMRRs from
 IOMMU API domains

On Thu, Jul 03, 2014 at 09:57:02AM -0600, Alex Williamson wrote:
> The user of the IOMMU API domain expects to have full control of
> the IOVA space for the domain.  RMRRs are fundamentally incompatible
> with that idea.  We can neither map the RMRR into the IOMMU API
> domain, nor can we guarantee that the device won't continue DMA with
> the area described by the RMRR as part of the new domain.  Therefore
> we must prevent such devices from being used by the IOMMU API.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: stable@...r.kernel.org

Applied, thanks Alex.
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