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Mon, 6 Jun 2022 06:19:59 +0000 Received: from rnnvmail205.nvidia.com (10.129.68.10) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Sun, 5 Jun 2022 23:19:58 -0700 Received: from Asurada-Nvidia.nvidia.com (10.127.8.12) by mail.nvidia.com (10.129.68.10) with Microsoft SMTP Server id 15.2.986.22 via Frontend Transport; Sun, 5 Jun 2022 23:19:56 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 3/5] vfio/iommu_type1: Prefer to reuse domains vs match enforced cache coherency Date: Sun, 5 Jun 2022 23:19:25 -0700 Message-ID: <20220606061927.26049-4-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220606061927.26049-1-nicolinc@nvidia.com> References: <20220606061927.26049-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: bb407244-624f-4b4a-99c6-08da478495e9 X-MS-TrafficTypeDiagnostic: DS7PR12MB6118:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2022 06:20:00.1466 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bb407244-624f-4b4a-99c6-08da478495e9 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.238];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT057.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6118 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Jason Gunthorpe The KVM mechanism for controlling wbinvd is only triggered during kvm_vfio_group_add(), meaning it is a one-shot test done once the devices are setup. So, there is no value in trying to push a device that could do enforced cache coherency to a dedicated domain vs re-using an existing domain since KVM won't be able to take advantage of it. This just wastes domain memory. Simplify this code and eliminate the test. This removes the only logic that needed to have a dummy domain attached prior to searching for a matching domain and simplifies the next patches. If someday we want to try and optimize this further the better approach is to update the Intel driver so that enforce_cache_coherency() can work on a domain that already has IOPTEs and then call the enforce_cache_coherency() after detaching a device from a domain to upgrade the whole domain to enforced cache coherency mode. Signed-off-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/vfio/vfio_iommu_type1.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index c13b9290e357..f4e3b423a453 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2285,9 +2285,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, * testing if they're on the same bus_type. */ list_for_each_entry(d, &iommu->domain_list, next) { - if (d->domain->ops == domain->domain->ops && - d->enforce_cache_coherency == - domain->enforce_cache_coherency) { + if (d->domain->ops == domain->domain->ops) { iommu_detach_group(domain->domain, group->iommu_group); if (!iommu_attach_group(d->domain, group->iommu_group)) {