Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=archive%2Fpre-squash 2026-09-22T13:51:51+00:00 2026-09-22T13:51:51+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-22T13:51:51+00:00 urn:sha1:8f01fb29256aa1a8ab3088015916425ff910e0b0 - Clear separation: EMULATE (GSP interface, BARs, config) vs PASS-THROUGH (compute, memory, DMA to physical GPU) - Phased roadmap: Phase 1 (GSP-RM correctness) → Phase 2 (memory model) → Phase 3 (compute forwarding) → Phase 4 (performance) → Phase 5 (graphics) - Host module architecture corrected: apt nvidia (570.211.01) for physical GPU, open-iov-vfio.ko for vGPU emulation, NO 610 submodule - Host stability guarantees documented (BAR3 shadow, submodule skip) - GSP_EMULATION_ARCHITECTURE.md: memory model corrected (BAR1/BAR3 shadows) 2026-09-14T10:43:11+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-14T10:43:11+00:00 urn:sha1:5dd8165f1754e156a0f9fb16c7a6bfa90e99ed60 - Removed IOMMU group addition before vfio_register_emulated_iommu_dev() in nv_vgpu_mdev_create() - Added IOMMUFD callbacks (bind_iommufd, unbind_iommufd, attach_ioas, detach_ioas) using kernel's vfio_iommufd_emulated_* functions - Implemented VFIO ioctl handlers: GET_INFO, GET_REGION_INFO, GET_IRQ_INFO, SET_IRQS, MMAP - Added config space read/write handlers at offset 0x70000000000 - Mmap handler for config space, BAR0 (emulation shadow), BAR1-5 (physical VRAM/registers) - Interrupt handler for VFIO_DEVICE_SET_IRQS (DATA_EVENTFD, DATA_NONE, DATA_BOOL) - Added udev rules for vfio group permissions - Created stack_manager.sh unified tool - Fixed mdev remove crash with deferred cleanup in vfio_device_release callback - Kernel 6.8+ IOMMUFD compatibility - QEMU launches successfully with vGPU passthrough