Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=refactor%2Fhost-gsp-emulation 2026-09-14T10:43:11+00:00 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 2026-09-13T23:11:39+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-13T23:11:39+00:00 urn:sha1:8e64754d9980d2423f1907ae184ec46e63e5ff7e - Enhanced PCI config space write handlers in main.c: - Added MSI-X Message Control (0x72-0x73) write support - Added MSI-X Table Offset/BIR (0x74-0x77) write support - Added MSI-X PBA Offset/BIR (0x78-0x7B) write support - Enhanced BAR emulation in bar_emulation.c: - Added MSI-X Table emulation (32 entries at BAR0+0x2000) - Added MSI-X PBA emulation (64-bit at BAR0+0x3000) - Added nv_vgpu_msix_set_pending/clear_pending for interrupt injection - Integrated with GSP emulation constants from gsp_emulation.h - Updated bar_emulation.h with MSI-X struct definitions and function declarations - Added GSP emulation constants to gsp_emulation.h (MSIX offsets, polling params) 2026-09-13T23:07:41+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-13T23:07:41+00:00 urn:sha1:4b745a1c2c0534a1850b6efe6710536b2225c3f4 - New kernel/gsp_emulation.h: GSP emulation context and API - New kernel/gsp_emulation.c: Per-mdev emulation thread with: - Adaptive polling of doorbell at BAR0+0x110C00 - Shared memory RPC processing (4KB at BAR0+0x1000) - Dispatch for all 12 RPC types via firmware-decompiled handlers - MSI-X completion interrupt injection via eventfd - Statistics tracking (processed/failed RPCs, latency) - Modified kernel/main.c: Integrate gsp_emu_init/cleanup in device lifecycle - Modified kernel/Makefile: Add gsp_emulation.o to build - Modified kernel/gsp_rpc_client.h: Export gsp_rpc_emulation_set/is_enabled