This adds the pasid attach/detach uAPIs for userspace to attach/detach a PASID of a device to/from a given ioas/hwpt. Only vfio-pci driver is enabled in this series. After this series, PASID-capable devices bound with vfio-pci can report PASID capability to userspace and VM to enable PASID usages like Shared Virtual Addressing (SVA). This series first adds the helpers for pasid attach in vfio core and then add the device cdev ioctls for pasid attach/detach, finally exposes the device PASID capability to user. It depends on iommufd pasid attach/detach series [1]. Complete code can be found at [2], tested with a draft Qemu branch[3] [1] https://lore.kernel.org/linux-iommu/20231127063428.127436-1-yi.l.liu@xxxxxxxxx/ [2] https://github.com/yiliu1765/iommufd/tree/iommufd_pasid [3] https://github.com/yiliu1765/qemu/tree/zhenzhong/wip/iommufd_nesting_rfcv1%2Bpasid Change log: v1: - Report PASID capability via VFIO_DEVICE_FEATURE (Alex) rfc: https://lore.kernel.org/linux-iommu/20230926093121.18676-1-yi.l.liu@xxxxxxxxx/ Regards, Yi Liu Kevin Tian (1): vfio-iommufd: Support pasid [at|de]tach for physical VFIO devices Yi Liu (2): vfio: Add VFIO_DEVICE_PASID_[AT|DE]TACH_IOMMUFD_PT vfio: Report PASID capability via VFIO_DEVICE_FEATURE ioctl drivers/vfio/device_cdev.c | 45 +++++++++++++++++++++ drivers/vfio/iommufd.c | 48 ++++++++++++++++++++++ drivers/vfio/pci/vfio_pci.c | 2 + drivers/vfio/pci/vfio_pci_core.c | 47 ++++++++++++++++++++++ drivers/vfio/vfio.h | 4 ++ drivers/vfio/vfio_main.c | 8 ++++ include/linux/vfio.h | 11 ++++++ include/uapi/linux/vfio.h | 68 ++++++++++++++++++++++++++++++++ 8 files changed, 233 insertions(+) -- 2.34.1
