linux-kernel - Re: [PATCH] iommu/intel: disable DMAR for Q35 integrated gfx

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Message-ID: <1480975635.81411.4.camel@infradead.org>
Date:   Mon, 05 Dec 2016 22:07:15 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Kees Cook <keescook@...omium.org>,
        Daniel Vetter <daniel.vetter@...el.com>
Cc:     iommu@...ts.linux-foundation.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, Joerg Roedel <joro@...tes.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/intel: disable DMAR for Q35 integrated gfx

On Mon, 2016-12-05 at 13:58 -0800, Kees Cook wrote:
> This blacklists the Q35 integrated graphics so IOMMU can be otherwise
> enabled. Without this, a Q35 system can only enable IOMMU when booting
> with "intel_iommu=on,igfx_off" but not "intel_iommu=on".

Hm, is this definitely the same bug? Or is it something different, and
perhaps a BIOS issue? There are many of those...

-- 
dwmw2
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