linux-kernel - Re: [PATCH] iommu/vt-d: Disable SVM when ATS/PRI/PASID are not enabled in the device

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Message-ID: <YFMqU2Rp+9CYVX6s@8bytes.org>
Date:   Thu, 18 Mar 2021 11:24:19 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Kyung Min Park <kyung.min.park@...el.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        baolu.lu@...ux.intel.com, dwmw2@...radead.org, will@...nel.org,
        jacob.jun.pan@...ux.intel.com, ashok.raj@...el.com,
        ravi.v.shankar@...el.com, yian.chen@...el.com,
        sohil.mehta@...el.com
Subject: Re: [PATCH] iommu/vt-d: Disable SVM when ATS/PRI/PASID are not
 enabled in the device

On Sun, Mar 14, 2021 at 01:15:34PM -0700, Kyung Min Park wrote:
> Currently, the Intel VT-d supports Shared Virtual Memory (SVM) only when
> IO page fault is supported. Otherwise, shared memory pages can not be
> swapped out and need to be pinned. The device needs the Address Translation
> Service (ATS), Page Request Interface (PRI) and Process Address Space
> Identifier (PASID) capabilities to be enabled to support IO page fault.
> 
> Disable SVM when ATS, PRI and PASID are not enabled in the device.
> 
> Signed-off-by: Kyung Min Park <kyung.min.park@...el.com>

Applied, thanks.