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Date: Tue, 29 Jul 2014 17:44:17 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: iommu@lists.linux-foundation.org, dwmw2@infradead.org, chegu_vinod@hp.com,
        linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH v2] iommu/intel: Exclude devices using RMRRs from
 IOMMU API domains
Message-ID: <20140729154417.GB27589@8bytes.org>
References: <20140703155435.8419.72901.stgit@gimli.home>
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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@redhat.com>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: stable@vger.kernel.org

Applied, thanks Alex.