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Mon, 8 May 2023 21:44:45 -0700 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail201.nvidia.com (10.126.190.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.37; Mon, 8 May 2023 21:44:44 -0700 Received: from Asurada-Nvidia.nvidia.com (10.127.8.10) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.986.37 via Frontend Transport; Mon, 8 May 2023 21:44:44 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , Subject: [PATCH v7 4/4] vfio: Support IO page table replacement Date: Mon, 8 May 2023 21:44:14 -0700 Message-ID: X-Mailer: git-send-email 2.40.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT068:EE_|DS7PR12MB8203:EE_ X-MS-Office365-Filtering-Correlation-Id: 00908405-c28d-45f2-7f57-08db504827a2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: c4PoPlXHwGd/Ls4LXlVya0oD/eMiPBlFGses1T273esUJS9d3xlSt9EA5kVigW8Uh3zvdVpPWKbGRespZ3zsri3IdHTFlUbaxpWSh1NVK8y9lVnuR7eM3pciTIANCA/dK132FeCP3v2/qRPiaSF2RNvyFQDaz+Zfg0by9Vy3ywb6WE1j36NVl0kNDpiGoUSonzTAmpwjH6Lr2T1xM5q8SWxwO6dw4qx5rQ9p0rYvm7Q1Wezo8gU1VXXT/0z1niBYONZoGNU58ftDpUg0fC0hzz+AljAeVWy8zzFBc7sfFjX/PVIc58vYUY3P3bCOgLtYcXWNcAn4IUZrtDd5tWxYLKJuBuTeme3wP3QJbnNbUsuDeY9ZsfvqHQViHtNB4b10NWGScSLO17nLVnv95ei/4npnvyycaA+Ogz3FVOUEa14eU60vHoQR8xxdyz+E1Xflji0mdy1SHASW6VgGdCZAynDEe4lxJRyY3IGGf8SvaI88VhXhvpLtdGRZNSjiqloreJw2LBnuV8NZ4nOQaNJR/XMM9kKOBfy53LvIysmwSsgd3E+RiXm2e6h6FSV8Z6lhRD/rgXkoCQg6l8pkhfuRTEVgF7Qt7zOl0LZSJgZYW4+uanzgBZKFfu6aSHrvFqpd042G+H6Hn+74BgWLw+Bc1K+IeWcGZmK4+Wu8nB3T7OpZG32TxplyXq1lpDIutbGZOcTkm/RGR9xSBLAswbauZg== X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(39860400002)(396003)(136003)(346002)(376002)(451199021)(46966006)(40470700004)(36840700001)(86362001)(36756003)(47076005)(54906003)(110136005)(316002)(4326008)(70586007)(478600001)(70206006)(7696005)(40480700001)(82310400005)(8676002)(41300700001)(5660300002)(8936002)(2906002)(7416002)(186003)(82740400003)(7636003)(356005)(336012)(2616005)(36860700001)(26005)(426003)(83380400001)(6666004)(40460700003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2023 04:45:03.4479 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 00908405-c28d-45f2-7f57-08db504827a2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT068.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8203 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Now both the physical path and the emulated path should support an IO page table replacement. Call iommufd_device_replace/iommufd_access_replace(), when vdev->iommufd_attached is true. Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header. Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen --- drivers/vfio/iommufd.c | 11 ++++++----- include/uapi/linux/vfio.h | 6 ++++++ 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index 00c14821bfa5..99eaf03e337b 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -161,9 +161,9 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id) return -EINVAL; if (vdev->iommufd_attached) - return -EBUSY; - - rc = iommufd_device_attach(vdev->iommufd_device, pt_id); + rc = iommufd_device_replace(vdev->iommufd_device, pt_id); + else + rc = iommufd_device_attach(vdev->iommufd_device, pt_id); if (rc) return rc; vdev->iommufd_attached = true; @@ -243,8 +243,9 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id) lockdep_assert_held(&vdev->dev_set->lock); if (vdev->iommufd_attached) - return -EBUSY; - rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); + rc = iommufd_access_replace(vdev->iommufd_access, *pt_id); + else + rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); if (rc) return rc; vdev->iommufd_attached = true; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 62bd41c214fd..e57112f63760 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -234,6 +234,12 @@ struct vfio_device_bind_iommufd { * * Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. * + * If a vfio device is currently attached to a valid hw_pagetable, without doing + * a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl + * passing in another hw_pagetable (hwpt) id is allowed. This action, also known + * as a hw_pagetable replacement, will replace the device's currently attached + * hw_pagetable with a new hw_pagetable corresponding to the given pt_id. + * * @argsz: user filled size of this data. * @flags: must be 0. * @pt_id: Input the target id which can represent an ioas or a hwpt