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performance roadmap
- 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)
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- 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
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