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Mon, 11 Sep 2023 07:12:03 -0500 From: Vasant Hegde To: , CC: , , , , Vasant Hegde Subject: [PATCH v2 02/11] iommu/amd: Do not override PASID entry in GCR3 table Date: Mon, 11 Sep 2023 12:10:37 +0000 Message-ID: <20230911121046.1025732-3-vasant.hegde@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230911121046.1025732-1-vasant.hegde@amd.com> References: <20230911121046.1025732-1-vasant.hegde@amd.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000252A2:EE_|DM4PR12MB5342:EE_ X-MS-Office365-Filtering-Correlation-Id: b1b6ed7c-9a52-423b-e26b-08dbb2c0516c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2023 12:12:07.1987 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b1b6ed7c-9a52-423b-e26b-08dbb2c0516c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000252A2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5342 Return error if PASID is already exists. Signed-off-by: Vasant Hegde --- drivers/iommu/amd/iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index f977b423d216..d7edb2d63fcb 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2732,6 +2732,9 @@ static int __set_gcr3(struct iommu_dev_data *dev_data, if (pte == NULL) return -ENOMEM; + if (*pte & GCR3_VALID) + return -EBUSY; + *pte = (gcr3 & PAGE_MASK) | GCR3_VALID; __amd_iommu_flush_tlb(dev_data->domain, pasid); -- 2.31.1