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Mon, 15 Aug 2022 11:14:43 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 0/5] Simplify vfio_iommu_type1 attach/detach routine Date: Mon, 15 Aug 2022 11:14:32 -0700 Message-ID: <20220815181437.28127-1-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: 42e74da4-a60f-4d27-abd2-08da7eea0a26 X-MS-TrafficTypeDiagnostic: BYAPR12MB3175:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?3T0znNhMYYbfBMf++6MsKiMLA6JpO8vmGgMq3oG7+hOFFSp/outHNYFKBJHo?= =?us-ascii?Q?swNqE4K7RlNthKqfP4gjrEoyXvQsUzIBALIJh6q4H+4iSeX7YXBfb9RRyzhn?= =?us-ascii?Q?6feLMt30VGM5Hc4w2TtzBQ19hDNxweeld3MiNwretgRNNoKmh290uZR8pm8c?= =?us-ascii?Q?iuRrcD76PytfpVBQVE0OHJCStWbZmRjTXsI4G9rSEaVqYQYLIp5PCHndwNh4?= =?us-ascii?Q?gUifeV5PvoASqnjKpEl/BMXPXA4Zt2tMyCVIO0rt9iLgZ3ZsNZjAsuQ+/yam?= =?us-ascii?Q?njJJWNJT+tqjwF8q4tArpxeh558R5M3+cUgjxr3t+P7WbTmVL1X4+62YOQOx?= =?us-ascii?Q?uRCYhn5XYa1scinSxwsB8KC2MvDGUqohKHr7Fqs7EcE25JtybKNwSMTfvm5c?= =?us-ascii?Q?ngnSRUhLDOKqWAzB1BJlA+DiNqb2ZFQHdlD+M1P5OrW0orl/W4faVMNTmIXy?= =?us-ascii?Q?ww3QnjI5LqtYWj0ogkA8tZoAdqq6mwfAkcnO4RllPIyWlwIXleMhfOhBd9sz?= =?us-ascii?Q?0iCXNeGSuL46CAKTu44/89IE1RIEMHnAUjtdndbVN5ZHddrQZ7d1ubWxjWMV?= =?us-ascii?Q?QDlTOwwVFMoEpKJh7VkwxdXmH99nhT/FCnNigHpBmyL87psDV4ukREWGxd+A?= =?us-ascii?Q?Ww54aGTdF4uuNMHPxXz6UOnubI7m5nDI9mo6aeBF6vgse/pSHUCdzM6joLVX?= =?us-ascii?Q?AdS7eAftaUIOCBSfDEVLRFFgW4ONnEcC5/33T7+OBEPlZGEL2zx/Ja16Cq1N?= =?us-ascii?Q?e04FQanRbXmGJF4Ck42A8RDeT5N1Ao4tp0Efy9wEqWttqTcyOfag5b3xQ9Is?= =?us-ascii?Q?IXe1rI7cuJO/9o/t+KRyeqxjjhVUVN8Joqz7bgodkkPMLjYVzGvhCaHKOiyT?= =?us-ascii?Q?ppEXxCKuPbPOjVZBAfrr6mjHesexFE+5DZSvJPbTGtfuFV7Ph9xj9FeDT4Pe?= =?us-ascii?Q?++t1FbUd/AkvBFCn7QGgQw=3D=3D?= X-Forefront-Antispam-Report: CIP:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(136003)(346002)(376002)(39860400002)(396003)(46966006)(40470700004)(36840700001)(36756003)(86362001)(1076003)(426003)(336012)(186003)(47076005)(82740400003)(2616005)(356005)(81166007)(83380400001)(70206006)(70586007)(5660300002)(8936002)(7416002)(7406005)(4326008)(8676002)(966005)(40480700001)(82310400005)(2906002)(478600001)(36860700001)(40460700003)(6666004)(26005)(7696005)(41300700001)(316002)(54906003)(110136005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2022 18:14:48.2225 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 42e74da4-a60f-4d27-abd2-08da7eea0a26 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.234];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT087.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3175 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 as KVM will not 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-v6 Changelog v6: * Rebased on top of v6.0-rc1 * Added "Reviewed-by" from Jason * Added "Cc" to Joerg/Will/Robin for the IOMMU patch v5: https://lore.kernel.org/kvm/20220701214455.14992-1-nicolinc@nvidia.com/ * Rebased on top of Robin's "Simplify bus_type determination". * Fixed a wrong change returning -EMEDIUMTYPE in arm-smmu driver. * Added Baolu's "Reviewed-by". v4: https://lore.kernel.org/kvm/20220630203635.33200-1-nicolinc@nvidia.com/ * Dropped -EMEDIUMTYPE change in mtk_v1 driver per Robin's input * Added Baolu's and Kevin's Reviewed-by lines v3: https://lore.kernel.org/kvm/20220623200029.26007-1-nicolinc@nvidia.com/ * Dropped all dev_err since -EMEDIUMTYPE clearly indicates what error. * Updated commit message of enforce_cache_coherency removing patch. * Updated commit message of domain->ops removing patch. * Replaced "goto out_unlock" with simply mutex_unlock() and return. * Added a line of comments for -EMEDIUMTYPE return check. * Moved iommu_get_msi_cookie() into alloc_attach_domain() as a cookie should be logically tied to the lifetime of a domain itself. * Added Kevin's "Reviewed-by". v2: https://lore.kernel.org/kvm/20220616000304.23890-1-nicolinc@nvidia.com/ * 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 | 15 +- drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 9 +- drivers/iommu/intel/iommu.c | 10 +- drivers/iommu/iommu.c | 28 ++ drivers/iommu/ipmmu-vmsa.c | 4 +- drivers/iommu/omap-iommu.c | 3 +- drivers/iommu/s390-iommu.c | 2 +- drivers/iommu/sprd-iommu.c | 6 +- drivers/iommu/tegra-gart.c | 2 +- drivers/iommu/virtio-iommu.c | 3 +- drivers/vfio/vfio_iommu_type1.c | 353 ++++++++++---------- 14 files changed, 229 insertions(+), 217 deletions(-) -- 2.17.1