open-iov.git/kernel/dynamic_rpc_dispatcher.c, branch m31

kernel: GR context-promote bisection modes 4-17 and server-managed-ctxbuf registry variant; complete vgsp rename; docs/tooling refresh

2026-10-02T19:13:06+00:00

- gsp_phys_booter: GR promote bisection modes 4-17 (two-phase zero-field VA, batched entries, hVirtMemory, bare VA, KMD SKIP_CTXBUFFER_ALLOC channel, old-interface GPU_INITIALIZE_CTX, FBMEM context buffer, UVM-faithful PA-only, PATCH/PM auxiliary promotes, server-managed no-promote path); PATCH/PM geometry queries and buffers; pre-boot SET_REGISTRY profile selection - gsp_phys_gpu: gsp_phys_rmcall_gr_promote clamp 0..17 and gsp_phys_srv_ctxbuf parameter; registry image variant with RMSetClientRMAllocatedCtxBuffer=0 - vgsp rename across kernel, scripts, tools and docs (module vgsp.ko, /sys/kernel/debug/vgsp/, vgsp-: log prefixes) - risc-v-gsp-rm-debugger user-facing rename and docs/CI refresh; guest-diag tool updates; README/SBOM/install/Makefile sync Live status: CE ladder and P6 guest-copy forwarding green; GR engine context commit still open (all promote shapes accepted or cleanly refused; the channel stays CTXNOTVALID) - see Handoff-vGPU-IO.md Addendum 21 (local).

sema: fix host stack-overflow hang; robust VA resolution; dispatcher lock fix

2026-09-29T12:40:19+00:00

- 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.

Open-IOV: initial public release

2026-09-23T09:46:43+00:00

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.