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dkim=none (message not signed) header.d=none;linux.ie; dmarc=none action=none header.from=nvidia.com; Received: from BL0PR12MB5506.namprd12.prod.outlook.com (2603:10b6:208:1cb::22) by BL1PR12MB5126.namprd12.prod.outlook.com (2603:10b6:208:312::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.15; Fri, 1 Oct 2021 17:52:53 +0000 Received: from BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::e8af:232:915e:2f95]) by BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::e8af:232:915e:2f95%8]) with mapi id 15.20.4566.019; Fri, 1 Oct 2021 17:52:53 +0000 From: Jason Gunthorpe To: David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Jonathan Corbet , Daniel Vetter , dri-devel@lists.freedesktop.org, Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, Jani Nikula , Jason Herne , Joonas Lahtinen , kvm@vger.kernel.org, Kirti Wankhede , linux-doc@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Peter Oberparleiter , Halil Pasic , Rodrigo Vivi , Vineeth Vijayan , Zhenyu Wang , Zhi Wang Cc: Christoph Hellwig , Christoph Hellwig Subject: [PATCH v3 00/10] Move vfio_ccw to the new mdev API Date: Fri, 1 Oct 2021 14:52:41 -0300 Message-Id: <0-v3-57c1502c62fd+2190-ccw_mdev_jgg@nvidia.com> X-ClientProxiedBy: BL1PR13CA0412.namprd13.prod.outlook.com (2603:10b6:208:2c2::27) To BL0PR12MB5506.namprd12.prod.outlook.com (2603:10b6:208:1cb::22) MIME-Version: 1.0 Received: from mlx.ziepe.ca (142.162.113.129) by BL1PR13CA0412.namprd13.prod.outlook.com (2603:10b6:208:2c2::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.7 via Frontend Transport; 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While it doesn't seem like the original attempt was functionally wrong, the result can be made better with a lot of further work. Reorganize the driver so that the mdev owns the private memory and controls the lifecycle, not the css_driver. The memory associated with the css_driver lifecycle is only the mdev_parent/mdev_type registration. Along the way we change when the sch is quiescent or not to be linked to the open/close_device lifetime of the vfio_device, which is sort of what it was tring to do already, just not completely. The troublesome racey lifecycle of the css_driver callbacks is made clear with simple vfio_device refcounting so a callback is only delivered into a registered vfio_device and has obvious correctness. Move the only per-css_driver state, the "available instance" counter, into the core code and share that logic with many of the other drivers. The value is kept in the mdev_type memory. This is on github: https://github.com/jgunthorpe/linux/commits/vfio_ccw v3: - Rebase to Christoph's group work & rc3; use vfio_register_emulated_iommu_dev() - Remove GFP_DMA - Order mdev_unregister_driver() symmetrically with init - Rework what is considered a BROKEN event in fsm_close() - NOP both CCW_EVENT_OPEN/CLOSE - Documentation updates - Remane goto label to err_init vfio_ccw_mdev_probe() - Fix NULL pointer deref in mdev_device_create() v2: https://lore.kernel.org/r/0-v2-7d3a384024cf+2060-ccw_mdev_jgg@nvidia.com - Clean up the lifecycle in ccw with 7 new patches - Rebase v1: https://lore.kernel.org/all/7-v2-7667f42c9bad+935-vfio3_jgg@nvidia.com Jason Gunthorpe (10): vfio/ccw: Remove unneeded GFP_DMA vfio/ccw: Use functions for alloc/free of the vfio_ccw_private vfio/ccw: Pass vfio_ccw_private not mdev_device to various functions vfio/ccw: Convert to use vfio_register_emulated_iommu_dev() vfio/ccw: Make the FSM complete and synchronize it to the mdev vfio/mdev: Consolidate all the device_api sysfs into the core code vfio/mdev: Add mdev available instance checking to the core vfio/ccw: Remove private->mdev vfio: Export vfio_device_try_get() vfio/ccw: Move the lifecycle of the struct vfio_ccw_private to the mdev .../driver-api/vfio-mediated-device.rst | 8 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 9 +- drivers/s390/cio/vfio_ccw_drv.c | 282 ++++++++---------- drivers/s390/cio/vfio_ccw_fsm.c | 158 +++++++--- drivers/s390/cio/vfio_ccw_ops.c | 240 +++++++-------- drivers/s390/cio/vfio_ccw_private.h | 42 ++- drivers/s390/crypto/vfio_ap_ops.c | 41 +-- drivers/s390/crypto/vfio_ap_private.h | 2 - drivers/vfio/mdev/mdev_core.c | 13 +- drivers/vfio/mdev/mdev_private.h | 2 + drivers/vfio/mdev/mdev_sysfs.c | 64 +++- drivers/vfio/vfio.c | 3 +- include/linux/mdev.h | 13 +- include/linux/vfio.h | 1 + samples/vfio-mdev/mbochs.c | 9 +- samples/vfio-mdev/mdpy.c | 31 +- samples/vfio-mdev/mtty.c | 10 +- 17 files changed, 482 insertions(+), 446 deletions(-) base-commit: d9a0cd510c3383b61db6f70a84e0c3487f836a63