IOASID was introduced in v5.5 as a generic kernel allocator service for both PCIe Process Address Space ID (PASID) and ARM SMMU's Sub Stream ID. In addition to basic ID allocation, ioasid_set was defined as a token that is shared by a group of IOASIDs. This set token can be used for permission checking, but lack of some features to address the following needs by guest Shared Virtual Address (SVA). - Manage IOASIDs by group, group ownership, quota, etc. - State synchronization among IOASID users - Non-identity guest-host IOASID mapping - Lifecycle management across many users
This patchset introduces the following extensions as solutions to the problems above. - Redefine and extend IOASID set such that IOASIDs can be managed by groups. - Add notifications for IOASID state synchronization - Add reference counting for life cycle alignment among users - Support ioasid_set private IDs, which can be used as guest IOASIDs Please refer to Documentation/ioasid.rst in enclosed patch 1/9 for more details. This patchset only included VT-d driver as users of some of the new APIs. VFIO and KVM patches are coming up to fully utilize the APIs introduced here. You can find this series at: https://github.com/jacobpan/linux.git ioasid_ext_v2 (VFIO and KVM patches will be available at this branch when published.) This work is a result of collaboration with many people: Liu, Yi L <yi.l....@intel.com> Wu Hao <hao...@intel.com> Ashok Raj <ashok....@intel.com> Kevin Tian <kevin.t...@intel.com> Thanks, Jacob Changelog V2: - Redesigned ioasid_set APIs, removed set ID - Added set private ID (SPID) for guest PASID usage. - Add per ioasid_set notification and priority support. - Back to use spinlocks and atomic notifications. - Added async work in VT-d driver to perform teardown outside atomic context Jacob Pan (9): docs: Document IO Address Space ID (IOASID) APIs iommu/ioasid: Rename ioasid_set_data() iommu/ioasid: Introduce ioasid_set APIs iommu/ioasid: Add reference couting functions iommu/ioasid: Introduce ioasid_set private ID iommu/ioasid: Introduce notification APIs iommu/vt-d: Listen to IOASID notifications iommu/vt-d: Send IOASID bind/unbind notifications iommu/vt-d: Store guest PASID during bind Documentation/ioasid.rst | 618 ++++++++++++++++++++++++++++++++ drivers/iommu/intel/iommu.c | 27 +- drivers/iommu/intel/pasid.h | 1 + drivers/iommu/intel/svm.c | 97 ++++- drivers/iommu/ioasid.c | 835 ++++++++++++++++++++++++++++++++++++++++++-- include/linux/intel-iommu.h | 2 + include/linux/ioasid.h | 166 ++++++++- 7 files changed, 1699 insertions(+), 47 deletions(-) create mode 100644 Documentation/ioasid.rst -- 2.7.4
