linux-kernel - RE: [PATCH 0/4] iommu: Reject drivers with broken_unmanaged

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Date:   Sun, 29 Jan 2023 07:46:55 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "agross@...nel.org" <agross@...nel.org>,
        "andersson@...nel.org" <andersson@...nel.org>,
        "konrad.dybcio@...aro.org" <konrad.dybcio@...aro.org>,
        "yong.wu@...iatek.com" <yong.wu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>
CC:     "vdumpa@...dia.com" <vdumpa@...dia.com>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: RE: [PATCH 0/4] iommu: Reject drivers with broken_unmanaged_domain

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, January 28, 2023 4:04 AM
> 
> Hi all,
> 
> Both IOMMU_DOMAIN_UNMANAGED and IOMMU_DOMAIN_DMA require
> the support
> of __IOMMU_DOMAIN_PAGING capability, i.e. iommu_map/unmap.
> However,
> some older iommu drivers do not fully support that, and these drivers
> also do not advertise support for dma-iommu.c via IOMMU_DOMAIN_DMA,
> or use arm_iommu_create_mapping(), so largely their implementations
> of IOMMU_DOMAIN_UNMANAGED are untested. This means that a user like
> vfio/iommufd does not likely work with them.
> 
> Thus, mark all these drivers as having "broken" UNAMANGED domains and
> add a new device_iommu_unmanaged_supported() API for vfio/iommufd
> and
> dma-iommu to refuse to work with these drivers.
> 

Why not making an explicit way to mark which drivers are tested to
support vfio/iommufd? Not sure whether pure code review is reliable
to filter out 'broken' vs. 'non-broken'...