linux-kernel - Re: [PATCH v14 00/13] SMMUv3 Nested Stage Setup (IOMMU part)

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Message-ID: <YILFAJ50aqvkQaT/@myrica>
Date:   Fri, 23 Apr 2021 15:00:48 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Sumit Gupta <sumitg@...dia.com>
Cc:     eric.auger@...hat.com, alex.williamson@...hat.com,
        eric.auger.pro@...il.com, iommu@...ts.linux-foundation.org,
        jiangkunkun@...wei.com, joro@...tes.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        lushenming@...wei.com, maz@...nel.org, robin.murphy@....com,
        tn@...ihalf.com, vivek.gautam@....com, vsethi@...dia.com,
        wangxingang5@...wei.com, will@...nel.org, zhangfei.gao@...aro.org,
        zhukeqian1@...wei.com, vdumpa@...dia.com
Subject: Re: [PATCH v14 00/13] SMMUv3 Nested Stage Setup (IOMMU part)

Hi Sumit,

On Thu, Apr 22, 2021 at 08:34:38PM +0530, Sumit Gupta wrote:
> Had to revert patch "mm: notify remote TLBs when dirtying a PTE".

Did that patch cause any issue, or is it just not needed on your system?
It fixes an hypothetical problem with the way ATS is implemented. Maybe I
actually observed it on an old software model, I don't remember. Either
way it's unlikely to go upstream but I'd like to know if I should drop it
from my tree.

Thanks,
Jean