Microconferences at Linux Plumbers Conference: VFIO/IOMMU/PCI

Linux Plumbers Conference 2022 is pleased to host the VFIO/IOMMU/PCI Microconference

The PCI interconnect specification, the devices that implement it, and the system IOMMUs that provide memory and access control to them are nowadays a de-facto standard for connecting high-speed components, incorporating more and more features such as:

  • Address Translation Service (ATS)/Page Request Interface (PRI)
  • Single-root I/O Virtualization (SR-IOV)/Process Address Space ID (PASID)
  • Shared Virtual Addressing (SVA)
  • Remote Direct Memory Access (RDMA)
  • Peer-to-Peer DMA (P2PDMA)
  • Cache Coherent Interconnect for Accelerators (CCIX)
  • Compute Express Link (CXL)
  • Data Object Exchange (DOE)
  • Component Measurement and Authentication (CMA)
  • Integrity and Data Encryption (IDE)
  • Security Protocol and Data Model (SPDM)
  • Gen-Z

These features are aimed at high-performance systems, server and desktop computing, embedded and SoC platforms, virtualization, and ubiquitous IoT devices.

The kernel code that enables these new system features focuses on coordination between the PCI devices, the IOMMUs they are connected to and the VFIO layer used to manage them (for userspace access and device passthrough) with related kernel interfaces and userspace APIs to be designed in-sync and in a clean way for all three sub-systems.

The VFIO/IOMMU/PCI micro-conference focuses on the kernel code that enables these new system features that often require coordination between the VFIO, IOMMU and PCI sub-systems.

Tentative topics include (but not limited to):

  • PCI
    • Cache Coherent Interconnect for Accelerators (CCIX)/Compute Express Link (CXL) expansion memory and accelerators management
    • Data Object Exchange (DOE)
    • Integrity and Data Encryption (IDE)
    • Component Measurement and Authentication (CMA)
    • Security Protocol and Data Model (SPDM)
    • I/O Address Space ID Allocator (IOASID)
    • INTX/MSI IRQ domain consolidation
    • Gen-Z interconnect fabric
    • ARM64 architecture and hardware
    • PCI native host controllers/endpoints drivers current challenges and improvements (e.g., state of PCI quirks, etc.)
    • PCI error handling and management e.g., Advanced Error Reporting (AER), Downstream Port Containment (DPC), ACPI Platform Error Interface (APEI) and Error Disconnect Recover (EDR)
    • Power management and devices supporting Active-state Power Management (ASPM)
    • Peer-to-Peer DMA (P2PDMA)
    • Resources claiming/assignment consolidation
    • Probing of native PCIe controllers and general reset implementation
    • Prefetchable vs non-prefetchable BAR address mappings
    • Untrusted/external devices management
    • DMA ownership models
    • Thunderbolt, DMA, RDMA and USB4 security
  • VFIO
    • Write-combine on non-x86 architectures
    • I/O Page Fault (IOPF) for passthrough devices
    • Shared Virtual Addressing (SVA) interface
    • Single-root I/O Virtualization(SRIOV)/Process Address Space ID (PASID) integration
    • PASID in SRIOV virtual functions
    • Device assignment/sub-assignment
    • /dev/iommufd development
    • IOMMU virtualization
    • IOMMU drivers SVA interface
    • DMA-API layer interactions and the move towards generic dma-ops for IOMMU drivers
    • Possible IOMMU core changes (e.g., better integration with device-driver core, etc.)

Come and join us in the discussion in helping Linux keep up with the new features being added to the PCI interconnect specification.

We hope to see you there !

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