open-iov.git/tools/guest-diag/sysc_shim.c, branch archive/pre-squashOpen-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers
https://git.vgpu.io/open-iov.git/atom?h=archive%2Fpre-squash2026-09-23T04:51:55+00:00tools: add guest-diag (ptrace ioctl tracer, vmcycle, root-port QEMU cmdline)2026-09-23T04:51:55+00:00Arthur Hanson Rasmussonarthur@vgpu.io2026-09-23T04:51:55+00:00urn:sha1:7897fe79ba6a00cc59b7a357903ecfc70480ce97
The ptrace tracer resolves the current CUDA blocker: libcuda issues raw
syscall instructions, so LD_PRELOAD shims and ltrace see nothing; following
the child with PTRACE_SYSCALL + PTRACE_GET_SYSCALL_INFO does. It found
UVM_REGISTER_GPU (ioctl 0x25) returning rmStatus=0x56 NV_ERR_NOT_SUPPORTED,
with inputs identical to the working host run (rmCtrlFd=-1, hClient=0,
hSmcPartRef=0). Also dumps NV_ESC_RM_CONTROL cmd/status and RM alloc/free
statuses (all zero) and the UVM ioctl set (guest stops after
0x27,0x1,0x25,0x2 vs 141 ioctls on the host).
launch_qemu_rootport.sh is the working QEMU command line with the
pcie-root-port fix (see its header + the handoff PART 4); vmcycle.sh drives
the module/mdev/VM reload cycle around it.