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Wed, 15 Jun 2022 17:03:08 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 0/5] Simplify vfio_iommu_type1 attach/detach routine Date: Wed, 15 Jun 2022 17:02:59 -0700 Message-ID: <20220616000304.23890-1-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 38d382b3-0dd0-492b-deb6-08da4f2b9a1a X-MS-TrafficTypeDiagnostic: MW3PR12MB4571:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.236;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(46966006)(36840700001)(40470700004)(426003)(6666004)(336012)(7696005)(316002)(110136005)(5660300002)(54906003)(36756003)(82310400005)(7406005)(83380400001)(7416002)(47076005)(70586007)(2906002)(40460700003)(70206006)(86362001)(8936002)(81166007)(356005)(966005)(4326008)(921005)(1076003)(36860700001)(2616005)(186003)(26005)(508600001)(8676002)(2101003)(36900700001)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jun 2022 00:03:11.2736 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 38d382b3-0dd0-492b-deb6-08da4f2b9a1a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT013.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4571 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This is a preparatory series for IOMMUFD v2 patches. It enforces error code -EMEDIUMTYPE in iommu_attach_device() and iommu_attach_group() when an IOMMU domain and a device/group are incompatible. It also drops the useless domain->ops check since it won't fail in current environment. These allow VFIO iommu code to simplify its group attachment routine, by avoiding the extra IOMMU domain allocations and attach/detach sequences of the old code. 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. This is on github: https://github.com/nicolinc/iommufd/commits/vfio_iommu_attach Changelog v2: * Added -EMEDIUMTYPE to more IOMMU drivers that fit the category. * Changed dev_err to dev_dbg for -EMEDIUMTYPE to avoid kernel log spam. * Dropped iommu_ops patch, and removed domain->ops in VFIO directly, since there's no mixed-driver use case that would fail the sanity. * Updated commit log of the patch removing enforce_cache_coherency. * Fixed a misplace of "num_non_pinned_groups--" in detach_group patch. * Moved "num_non_pinned_groups++" in PATCH-5 to the common path between domain-reusing and new-domain pathways, like the code previously did. * Fixed a typo in EMEDIUMTYPE patch. v1: https://lore.kernel.org/kvm/20220606061927.26049-1-nicolinc@nvidia.com/ Jason Gunthorpe (1): vfio/iommu_type1: Prefer to reuse domains vs match enforced cache coherency Nicolin Chen (4): iommu: Return -EMEDIUMTYPE for incompatible domain and device/group vfio/iommu_type1: Remove the domain->ops comparison vfio/iommu_type1: Clean up update_dirty_scope in detach_group() vfio/iommu_type1: Simplify group attachment drivers/iommu/amd/iommu.c | 2 +- drivers/iommu/apple-dart.c | 4 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 +- drivers/iommu/arm/arm-smmu/arm-smmu.c | 4 +- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 4 +- drivers/iommu/intel/iommu.c | 6 +- drivers/iommu/iommu.c | 28 ++ drivers/iommu/ipmmu-vmsa.c | 4 +- drivers/iommu/mtk_iommu_v1.c | 2 +- drivers/iommu/omap-iommu.c | 4 +- drivers/iommu/s390-iommu.c | 2 +- drivers/iommu/sprd-iommu.c | 4 +- drivers/iommu/tegra-gart.c | 2 +- drivers/iommu/virtio-iommu.c | 4 +- drivers/vfio/vfio_iommu_type1.c | 317 ++++++++++---------- 15 files changed, 220 insertions(+), 179 deletions(-) -- 2.17.1