The primary goal of this series is to better manage device memory mappings, both with a much simplified scheme to zap CPU mappings of device memory using unmap_mapping_range() and also to restrict IOMMU mappings of PFNMAPs to vfio device memory and drop those mappings on device release. This series updates vfio-pci to include the necessary vma-to-pfn interface, allowing the type1 IOMMU backend to recognize vfio device memory. If other bus drivers support peer-to-peer DMA, they should be updated with a similar callback and trigger the device notifier on release.
RFC->v1: - Fix some incorrect ERR handling - Fix use of vm_pgoff to be compatible with unmap_mapping_range() - Add vma-to-pfn interfaces - Generic device-from-vma handling - pfnmap obj directly maps back to vfio_dma obj - No bypass for strict MMIO handling - Batch PFNMAP handling - Follow-on patches to cleanup "extern" usage and bare unsigned Works in my environment, further testing always appreciated. This will need to be merged with a solution for concurrent fault handling. Thanks especially to Jason Gunthorpe for previous reviews and suggestions. Thanks, Alex RFC:https://lore.kernel.org/kvm/161401167013.16443.8389863523766611711.st...@gimli.home/ --- Alex Williamson (14): vfio: Create vfio_fs_type with inode per device vfio: Update vfio_add_group_dev() API vfio: Export unmap_mapping_range() wrapper vfio/pci: Use vfio_device_unmap_mapping_range() vfio: Create a vfio_device from vma lookup vfio: Add vma to pfn callback vfio: Add a device notifier interface vfio/pci: Notify on device release vfio/type1: Refactor pfn_list clearing vfio/type1: Pass iommu and dma objects through to vaddr_get_pfn vfio/type1: Register device notifier vfio/type1: Support batching of device mappings vfio: Remove extern from declarations across vfio vfio: Cleanup use of bare unsigned Documentation/driver-api/vfio-mediated-device.rst | 19 +- Documentation/driver-api/vfio.rst | 8 - drivers/s390/cio/vfio_ccw_cp.h | 13 + drivers/s390/cio/vfio_ccw_private.h | 14 + drivers/s390/crypto/vfio_ap_private.h | 2 drivers/vfio/Kconfig | 1 drivers/vfio/fsl-mc/vfio_fsl_mc.c | 6 - drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 7 - drivers/vfio/mdev/vfio_mdev.c | 5 drivers/vfio/pci/vfio_pci.c | 229 ++++----------------- drivers/vfio/pci/vfio_pci_intrs.c | 42 ++-- drivers/vfio/pci/vfio_pci_private.h | 69 +++--- drivers/vfio/platform/vfio_platform_common.c | 7 - drivers/vfio/platform/vfio_platform_irq.c | 21 +- drivers/vfio/platform/vfio_platform_private.h | 31 +-- drivers/vfio/vfio.c | 154 ++++++++++++-- drivers/vfio/vfio_iommu_type1.c | 234 +++++++++++++++------ include/linux/vfio.h | 129 ++++++------ 18 files changed, 543 insertions(+), 448 deletions(-)
