linux-kernel - Re: [PATCH 0/5] Simplify vfio_iommu

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Message-ID: <20220607115820.GH1343366@nvidia.com>
Date:   Tue, 7 Jun 2022 08:58:20 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Nicolin Chen <nicolinc@...dia.com>, joro@...tes.org,
        will@...nel.org, marcan@...can.st, sven@...npeter.dev,
        robin.murphy@....com, robdclark@...il.com,
        m.szyprowski@...sung.com, krzysztof.kozlowski@...aro.org,
        agross@...nel.org, bjorn.andersson@...aro.org,
        matthias.bgg@...il.com, heiko@...ech.de, orsonzhai@...il.com,
        baolin.wang7@...il.com, zhang.lyra@...il.com, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org,
        jean-philippe@...aro.org, alex.williamson@...hat.com,
        suravee.suthikulpanit@....com, alyssa@...enzweig.io,
        alim.akhtar@...sung.com, dwmw2@...radead.org, yong.wu@...iatek.com,
        mjrosato@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
        cohuck@...hat.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
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        linux-rockchip@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [PATCH 0/5] Simplify vfio_iommu_type1 attach/detach routine

On Tue, Jun 07, 2022 at 03:44:43PM +0800, Baolu Lu wrote:
> On 2022/6/6 14:19, Nicolin Chen wrote:
> > Worths mentioning the exact match for enforce_cache_coherency is removed
> > with this series, since there's very less value in doing that since KVM
> > won't be able to take advantage of it -- this just wastes domain memory.
> > Instead, we rely on Intel IOMMU driver taking care of that internally.
> 
> After reading this series, I don't see that Intel IOMMU driver needs any
> further change to support the new scheme. Did I miss anything?

You already did it :)

Jason