linux-kernel - Re: [PATCH 2/5] iommu/vt-d: Remove WO permissions on second-level paging entries

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Message-ID: <YFMZjiGT13S2TZ6H@8bytes.org>
Date:   Thu, 18 Mar 2021 10:12:46 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>, Will Deacon <will@...nel.org>,
        kevin.tian@...el.com, jacob.jun.pan@...el.com, yi.l.liu@...el.com,
        sanjay.k.kumar@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] iommu/vt-d: Remove WO permissions on second-level
 paging entries

Hi,

On Mon, Mar 08, 2021 at 11:47:46AM -0800, Raj, Ashok wrote:
> That is the primary motivation, given that we have moved to 1st level for
> general IOVA, first level doesn't have a WO mapping. I didn't know enough
> about the history to determine if a WO without a READ is very useful. I
> guess the ZLR was invented to support those cases without a READ in PCIe. I

Okay, please update the commit message and re-send. I guess these
patches are 5.13 stuff. In that case, Baolu can include them into his
pull request later this cycle.

Regards,

	Joerg