linux-kernel - Re: [PATCH v5 02/12] iommu/vt-d: Manage scalalble mode PASID tables

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Message-ID: <20181205154710.GB16835@8bytes.org>
Date:   Wed, 5 Dec 2018 16:47:10 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     "Liu, Yi L" <yi.l.liu@...el.com>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v5 02/12] iommu/vt-d: Manage scalalble mode PASID tables

On Mon, Dec 03, 2018 at 05:23:40PM +0000, Liu, Yi L wrote:
> So for a device without PASID support, we need to at least to have a PASID
> entry so that its DMA request (without pasid) can be translated. Thus a PASID
> table is needed for such devices.

That makes sense, thanks for the explanation.


	Joerg