linux-kernel - Re: [PATCH v4] iommu/vt-d: Don't apply gfx quirks to untrusted devices

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Date:   Wed, 3 Jun 2020 17:54:48 +0300
From:   Mika Westerberg <mika.westerberg@...el.com>
To:     Rajat Jain <rajatja@...gle.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Ashok Raj <ashok.raj@...el.com>,
        lalithambika.krishnakumar@...el.com, rajatxjain@...il.com,
        pmalani@...gle.com, bleung@...gle.com, levinale@...gle.com,
        zsm@...gle.com, mnissler@...gle.com, tbroch@...gle.com
Subject: Re: [PATCH v4] iommu/vt-d: Don't apply gfx quirks to untrusted
 devices

On Wed, Jun 03, 2020 at 06:03:17AM -0700, Rajat Jain wrote:
> Currently, an external malicious PCI device can masquerade the VID:PID
> of faulty gfx devices, and thus apply iommu quirks to effectively
> disable the IOMMU restrictions for itself.
> 
> Thus we need to ensure that the device we are applying quirks to, is
> indeed an internal trusted device.
> 
> Signed-off-by: Rajat Jain <rajatja@...gle.com>
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Ashok Raj <ashok.raj@...el.com>

Looks good now, thanks!

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>