open-iov.git/tools/guest-diag/nvkmstrace.c, branch masterOpen-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers
https://git.vgpu.io/open-iov.git/atom?h=master2026-10-25T04:18:46+00:00docs + nvkmstrace: the GL/Vulkan wall fully bisected (SESSION 65) - ALLOC_DEVICE reply status 5 (CORE_CHANNEL_ALLOC_FAILED) decoded by the LD_PRELOAD nvKms logger with a widened reply scan; the empty display capability notifier is the first missing piece (a live-gdb fill of SYS_CAP/SYS_CAPB flips the driver to the window path, proving numWindows>0 unblocks it); the residual wall is the vGPU-guest display-class rejection: nvRmApiAlloc(0xc57e) returns NV_ERR_NOT_SUPPORTED inside the guest kernel and never reaches the emulated GSP - the guest runs in vGPU mode where display/modeset classes are host-service-provided by design2026-10-25T04:18:46+00:00Arthur Hanson Rasmussonarthur@vgpu.io2026-10-25T04:18:46+00:00urn:sha1:0ed3ad45c4a4a88c1b28dbe1dcdababbeb094d41tools/vk + nvkmstrace: real-Vulkan probe stack for the emulated vGPU - vk_probe/vk_probe2 (ctypes loader probes: enumerate + create device/queue), vk_frame (headless Vulkan compute renderer: loads the NVIDIA ICD, paints a plasma into an RGBA8 storage image, reads it back to PPM and publishes frames into the kvmfr ivshmem BAR), vk_plasma.comp -> SPIR-V; nvkmstrace.c (LD_PRELOAD NVKMS ioctl logger that decoded the vkCreateDevice failure to ALLOC_DEVICE cmd=0). Measured: the NVIDIA device enumerates and its Vulkan ICD loads (2 ICDs: NVIDIA + llvmpipe); vkCreateDevice fails VK_ERROR_INITIALIZATION_FAILED because nvKmsAllocDevice returns non-success after the display shim2026-10-25T02:13:05+00:00Arthur Hanson Rasmussonarthur@vgpu.io2026-10-25T02:13:05+00:00urn:sha1:b43291c5420964424bfcf0aab0f1454c2c3b0613