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Fri, 1 Jul 2022 14:45:06 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , Subject: [PATCH v5 3/5] vfio/iommu_type1: Remove the domain->ops comparison Date: Fri, 1 Jul 2022 14:44:53 -0700 Message-ID: <20220701214455.14992-4-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220701214455.14992-1-nicolinc@nvidia.com> References: <20220701214455.14992-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 93708aec-57cd-4372-09f8-08da5baaf899 X-MS-TrafficTypeDiagnostic: CH2PR12MB4149:EE_ 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:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(346002)(396003)(136003)(39860400002)(376002)(46966006)(40470700004)(36840700001)(186003)(2616005)(1076003)(83380400001)(2906002)(81166007)(336012)(426003)(86362001)(82740400003)(356005)(36860700001)(921005)(40460700003)(8936002)(47076005)(8676002)(4326008)(7416002)(966005)(5660300002)(82310400005)(40480700001)(70206006)(70586007)(110136005)(316002)(54906003)(7696005)(7406005)(36756003)(478600001)(26005)(41300700001)(6666004)(36900700001)(83996005)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2022 21:45:09.8443 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 93708aec-57cd-4372-09f8-08da5baaf899 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: DM6NAM11FT049.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4149 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220701_144516_345147_335AFD65 X-CRM114-Status: GOOD ( 13.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mjrosato@linux.ibm.com, virtualization@lists.linux-foundation.org, thierry.reding@gmail.com, alyssa@rosenzweig.io, linux-s390@vger.kernel.org, kvm@vger.kernel.org, jonathanh@nvidia.com, iommu@lists.linux.dev, yangyingliang@huawei.com, gerald.schaefer@linux.ibm.com, linux-arm-msm@vger.kernel.org, john.garry@huawei.com, christophe.jaillet@wanadoo.fr, thunder.leizhen@huawei.com, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, chenxiang66@hisilicon.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, suravee.suthikulpanit@amd.com, dwmw2@infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The domain->ops validation was added, as a precaution, for mixed-driver systems. Per Robin's remarks, * While bus_set_iommu() still exists, the core code prevents multiple drivers from registering, so we can't really run into a situation of having a mixed-driver system: https://lore.kernel.org/kvm/6e1280c5-4b22-ebb3-3912-6c72bc169982@arm.com/ * And there's plenty more significant problems than this to fix; in future when many can be permitted, we will rely on the IOMMU core code to check the domain->ops: https://lore.kernel.org/kvm/6575de6d-94ba-c427-5b1e-967750ddff23@arm.com/ So remove the check in VFIO for simplicity. Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen Reviewed-by: Jason Gunthorpe --- drivers/vfio/vfio_iommu_type1.c | 32 +++++++++++--------------------- 1 file changed, 11 insertions(+), 21 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 7530f0d727e5..5992ee2345a0 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2280,29 +2280,19 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, domain->domain->ops->enforce_cache_coherency( domain->domain); - /* - * Try to match an existing compatible domain. We don't want to - * preclude an IOMMU driver supporting multiple bus_types and being - * able to include different bus_types in the same IOMMU domain, so - * we test whether the domains use the same iommu_ops rather than - * testing if they're on the same bus_type. - */ + /* Try to match an existing compatible domain */ list_for_each_entry(d, &iommu->domain_list, next) { - if (d->domain->ops == domain->domain->ops) { - iommu_detach_group(domain->domain, group->iommu_group); - if (!iommu_attach_group(d->domain, - group->iommu_group)) { - list_add(&group->next, &d->group_list); - iommu_domain_free(domain->domain); - kfree(domain); - goto done; - } - - ret = iommu_attach_group(domain->domain, - group->iommu_group); - if (ret) - goto out_domain; + iommu_detach_group(domain->domain, group->iommu_group); + if (!iommu_attach_group(d->domain, group->iommu_group)) { + list_add(&group->next, &d->group_list); + iommu_domain_free(domain->domain); + kfree(domain); + goto done; } + + ret = iommu_attach_group(domain->domain, group->iommu_group); + if (ret) + goto out_domain; } vfio_test_domain_fgsp(domain);