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Message-ID: <BL1PR11MB5271CE591B0CA093C8900FF78CD29@BL1PR11MB5271.namprd11.prod.outlook.com>
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>,
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"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
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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'...
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