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To:     David Woodhouse <dwmw2@infradead.org>,
        Joerg Roedel <joro@8bytes.org>,
        Lu Baolu <baolu.lu@linux.intel.com>
From:   Chris Wilson <chris@chris-wilson.co.uk>
In-Reply-To: <1525410499-18632-4-git-send-email-baolu.lu@linux.intel.com>
Cc:     ashok.raj@intel.com, iommu@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>,
        "Balestrieri, Francesco" <francesco.balestrieri@intel.com>
References: <1525410499-18632-1-git-send-email-baolu.lu@linux.intel.com>
 <1525410499-18632-4-git-send-email-baolu.lu@linux.intel.com>
Message-ID: <153094688126.17577.10340360451966114779@cwilso3-mobl.ger.corp.intel.com>
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Subject: Re: [PATCH 3/4] iommu/vt-d: Clean up pasid quirk for pre-production devices
Date:   Sat, 07 Jul 2018 08:01:22 +0100
Sender: linux-kernel-owner@vger.kernel.org
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Quoting Lu Baolu (2018-05-04 06:08:18)
> The pasid28 quirk is needed only for some pre-production devices.
> Remove it to make the code concise.

Every skylake mixing iommu and i915 is now inoperable on boot. Reads
by the GPU from iommu map pages return zero, writes disappear into the
void, no errors flagged.

Please revert until the matter is resolved.
-Chris