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Thu, 3 Aug 2023 09:33:00 -0500 From: Nipun Gupta To: , , CC: , , , , , Nipun Gupta , Shubham Rohila Subject: [PATCH v5 2/3] vfio: add bus master feature to device feature ioctl Date: Thu, 3 Aug 2023 20:02:52 +0530 Message-ID: <20230803143253.7817-2-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230803143253.7817-1-nipun.gupta@amd.com> References: <20230803143253.7817-1-nipun.gupta@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE3F:EE_|BN9PR12MB5113:EE_ X-MS-Office365-Filtering-Correlation-Id: b9727572-906d-4348-91c7-08db942e8d2b 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:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(376002)(39860400002)(346002)(396003)(136003)(82310400008)(451199021)(36840700001)(46966006)(40470700004)(36756003)(86362001)(82740400003)(40460700003)(40480700001)(54906003)(478600001)(110136005)(356005)(81166007)(47076005)(1076003)(426003)(2616005)(83380400001)(336012)(186003)(26005)(8676002)(8936002)(44832011)(41300700001)(6666004)(36860700001)(316002)(5660300002)(2906002)(4326008)(70206006)(70586007)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Aug 2023 14:33:05.9812 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9727572-906d-4348-91c7-08db942e8d2b 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE3F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5113 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org add bus mastering control to VFIO_DEVICE_FEATURE IOCTL. The VFIO user can use this feature to enable or disable the Bus Mastering of a device bound to VFIO. Co-developed-by: Shubham Rohila Signed-off-by: Shubham Rohila Signed-off-by: Nipun Gupta Changes in v5: - This patch is newly added which proposes a new flag VFIO_DEVICE_FEATURE_BUS_MASTER in VFIO_DEVICE_FEATURE IOCTL. --- include/uapi/linux/vfio.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 20c804bdc09c..05350a2f1eab 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -1287,6 +1287,22 @@ struct vfio_device_feature_mig_data_size { #define VFIO_DEVICE_FEATURE_MIG_DATA_SIZE 9 +/** + * Upon VFIO_DEVICE_FEATURE_SET, allow the BUS mastering for the device to be + * set or clear based on the operation specified in op flag. + * + * If the BUS MASTER of the device is configured to CLEAR, + * all the incoming DMA from the device will be blocked. + * If the BUS MASTER of the device is configured to SET (enable), + * device would be able to do DMA to host memory. + */ +struct vfio_device_feature_bus_master { + __u32 op; +#define VFIO_DEVICE_FEATURE_SET_MASTER 0 /* Set Bus Master */ +#define VFIO_DEVICE_FEATURE_CLEAR_MASTER 1 /* Clear Bus Master */ +}; +#define VFIO_DEVICE_FEATURE_BUS_MASTER 9 + /* -------- API for Type1 VFIO IOMMU -------- */ /** -- 2.17.1