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Thu, 23 Jun 2022 13:01:36 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , Subject: [PATCH v3 3/5] vfio/iommu_type1: Remove the domain->ops comparison Date: Thu, 23 Jun 2022 13:00:27 -0700 Message-ID: <20220623200029.26007-4-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220623200029.26007-1-nicolinc@nvidia.com> References: <20220623200029.26007-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: be33d66a-062a-445e-9b6a-08da55532fe8 X-MS-TrafficTypeDiagnostic: SN6PR12MB2751: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:12.22.5.235;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(346002)(396003)(376002)(136003)(39860400002)(40470700004)(36840700001)(46966006)(40480700001)(7406005)(83380400001)(426003)(336012)(86362001)(2616005)(70206006)(6666004)(70586007)(4326008)(8676002)(186003)(8936002)(7416002)(5660300002)(36860700001)(47076005)(1076003)(81166007)(82740400003)(316002)(40460700003)(41300700001)(921005)(356005)(26005)(478600001)(7696005)(36756003)(2906002)(82310400005)(110136005)(54906003)(966005)(36900700001)(83996005)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jun 2022 20:01:39.9047 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: be33d66a-062a-445e-9b6a-08da55532fe8 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT032.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR12MB2751 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220623_130152_306628_A984FA93 X-CRM114-Status: GOOD ( 13.29 ) 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, jordan@cosmicpenguin.net, thierry.reding@gmail.com, alyssa@rosenzweig.io, linux-s390@vger.kernel.org, kvm@vger.kernel.org, jonathanh@nvidia.com, yong.wu@mediatek.com, 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, tglx@linutronix.de, virtualization@lists.linux-foundation.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, linux-mediatek@lists.infradead.org, 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 --- 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 f4e3b423a453..11be5f95580b 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2277,29 +2277,19 @@ 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);