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Thu, 20 Nov 2025 12:37:04 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: Jason Gunthorpe , Alex Williamson , "Kevin Tian" , Yishai Hadas , Longfang Liu , Shameer Kolothum , "Brett Creeley" , Giovanni Cabiddu , , , , CC: =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH 0/6] vfio: Reset migration device state using dedicated callback Date: Thu, 20 Nov 2025 13:36:41 +0100 Message-ID: <20251120123647.3522082-1-michal.winiarski@intel.com> X-Mailer: git-send-email 2.51.2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: VI1PR07CA0237.eurprd07.prod.outlook.com (2603:10a6:802:58::40) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5373:EE_|DM3PPFC3B7BD011:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e84ce74-782d-4d80-507f-08de283182ba X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|921020; 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Initially, it was believed that the locking issue is related to calling copy_from_user()/copy_to_user() under state_mutex [2], but it turns out that it's a generic issue that has impact on all drivers that are not implementing a "deferred reset". This is a first attempt to simplify the migration device state locking, following a suggestion from Jason to try and solve the issue on core side rather than duplicating deferred reset in all of the drivers. Introduce a dedicated .migration_reset_state() callback called outside vdev->memory_lock to break the locking dependency chain and convert all of the drivers to use it. [1] https://lore.kernel.org/intel-xe/7dtl5qum4mfgjosj2mkfqu5u5tu7p2roi2et3env4lhrccmiqi@asemffaeeflr/ [2] https://lore.kernel.org/kvm/20240220132459.GM13330@nvidia.com/ Michał Winiarski (6): vfio: Introduce .migration_reset_state() callback hisi_acc_vfio_pci: Use .migration_reset_state() callback vfio/pds: Use .migration_reset_state() callback vfio/qat: Use .migration_reset_state() callback vfio/mlx5: Use .migration_reset_state() callback vfio/virtio: Use .migration_reset_state() callback .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 7 +- drivers/vfio/pci/mlx5/cmd.c | 15 ++-- drivers/vfio/pci/mlx5/cmd.h | 3 - drivers/vfio/pci/mlx5/main.c | 59 ++++----------- drivers/vfio/pci/pds/pci_drv.c | 10 --- drivers/vfio/pci/pds/vfio_dev.c | 12 ++++ drivers/vfio/pci/qat/main.c | 36 +++++----- drivers/vfio/pci/vfio_pci_core.c | 25 ++++++- drivers/vfio/pci/virtio/common.h | 3 - drivers/vfio/pci/virtio/main.c | 1 - drivers/vfio/pci/virtio/migrate.c | 71 ++++++------------- include/linux/vfio.h | 4 ++ 12 files changed, 101 insertions(+), 145 deletions(-) -- 2.51.2