> -----Original Message----- > From: Lu Baolu [mailto:baolu.lu@xxxxxxxxxxxxxxx] > Sent: 26 October 2023 03:49 > To: Jason Gunthorpe <jgg@xxxxxxxx>; Kevin Tian <kevin.tian@xxxxxxxxx>; > Joerg Roedel <joro@xxxxxxxxxx>; Will Deacon <will@xxxxxxxxxx>; Robin > Murphy <robin.murphy@xxxxxxx>; Jean-Philippe Brucker > <jean-philippe@xxxxxxxxxx>; Nicolin Chen <nicolinc@xxxxxxxxxx>; Yi Liu > <yi.l.liu@xxxxxxxxx>; Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> > Cc: iommu@xxxxxxxxxxxxxxx; linux-kselftest@xxxxxxxxxxxxxxx; > virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Lu > Baolu <baolu.lu@xxxxxxxxxxxxxxx> > Subject: [PATCH v2 0/6] IOMMUFD: Deliver IO page faults to user space > > Hi folks, > > This series implements the functionality of delivering IO page faults to > user space through the IOMMUFD framework for nested translation. Nested > translation is a hardware feature that supports two-stage translation > tables for IOMMU. The second-stage translation table is managed by the > host VMM, while the first-stage translation table is owned by user > space. This allows user space to control the IOMMU mappings for its > devices. > > When an IO page fault occurs on the first-stage translation table, the > IOMMU hardware can deliver the page fault to user space through the > IOMMUFD framework. User space can then handle the page fault and > respond > to the device top-down through the IOMMUFD. This allows user space to > implement its own IO page fault handling policies. > > User space indicates its capability of handling IO page faults by > setting the IOMMU_HWPT_ALLOC_IOPF_CAPABLE flag when allocating a > hardware page table (HWPT). IOMMUFD will then set up its infrastructure > for page fault delivery. On a successful return of HWPT allocation, the > user can retrieve and respond to page faults by reading and writing to > the file descriptor (FD) returned in out_fault_fd. > > The iommu selftest framework has been updated to test the IO page fault > delivery and response functionality. > > This series is based on the latest implementation of nested translation > under discussion [1] and the page fault handling framework refactoring in > the IOMMU core [2]. > > The series and related patches are available on GitHub: [3] > > [1] > https://lore.kernel.org/linux-iommu/20230921075138.124099-1-yi.l.liu@int > el.com/ > [2] > https://lore.kernel.org/linux-iommu/20230928042734.16134-1-baolu.lu@li > nux.intel.com/ > [3] > https://github.com/LuBaolu/intel-iommu/commits/iommufd-io-pgfault-deliv > ery-v2 Hi Baolu, Do you have a corresponding Qemu git to share? I could give it a spin on our ARM platform. Please let me know. Thanks, Shameer
