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- svc_handle_chan_dump()/svc_decode_stream(): static snapshot buffers. The
128-channel local array made an ~18 KB frame, which overflows the 16 KB
kernel stack in the function prologue and panicked the host 2-3 s after a
VM attached the vGPU (proven from EFI pstore: guard page hit at
svc_handle_chan_dump+0x20, sub rsp,0x4850).
- svc_pump_channels(): write-back now also persists expected_sem_payload,
rescue_last and rescue_fail. The pump works on a snapshot copy, so
without this the stale-entry skip and the rescue rate limit could never
fire and the payload expectation was reinitialized every pass.
- svc_targeted_resolve(): sliced scan (128 MB per call, one VA at a time,
failed-VA cache) instead of a full-RAM scan per miss; no longer appends
to the sorted map out of order.
- svc_rebuild(): merges new scan results into the previous map (fresh
translation wins in place, new VAs appended) instead of replacing it
wholesale, so live translations survive a scan-yield collapse.
- Warning fixes: misleading indentation, unused variable, jiffies
typecheck. Frame audit: largest frame now 872 B.
- Includes the previous session's uncommitted work: sema_counter /
shadow_scan / shadow_dump debug params, exit stage markers, pdev ref
fix, and the dynamic dispatcher request_firmware-out-of-spinlock fix.
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Open-IOV virtualizes NVIDIA GPUs so that unmodified guest drivers run with
real GPU functionality - CUDA first, 3D and video to follow - on unmodified
hosts, without a proprietary vGPU license and without patching any driver,
firmware or hypervisor.
Core principle: emulate the interface, pass through the work.
kernel/ open-iov-vfio.ko - host VFIO mdev driver: virtual GPU device
(PCI config space, BAR shadows, MSI-X), GSP boot emulation,
GSP-RM message-queue/RPC emulation, memory model (GPU-VA to
guest-PA discovery) and the semaphore-completion service that
advances guest UVM progress.
userspace/ libiov.so management API and examples.
tools/ guest diagnostics, firmware analysis wrappers, RM probes.
scripts/ stack manager, VM harness, build/load/test automation.
config/ hardware/version profiles (the portability surface).
docs/ documentation tree - start at docs/README.md.
wiki/ long-form firmware and protocol deep dives.
Status: initialization works end to end for a stock 570.144 Linux guest on
Turing (TU104): driver probe, nvidia-smi, the full GSP-RM control battery,
object creation and the early CUDA/UVM start-up path. GPU work forwarding -
the step that makes CUDA kernels execute on real hardware - is the active
work item; see docs/04-implementation/01-known-knowns-and-unknowns.md.
License: BSD-3-Clause for the project; GPL-2.0 for kernel modules that link
GPL-only kernel interfaces. See LICENSE and docs/09-reference/legal-and-licensing.md.
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