Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=m31 2026-10-06T19:24:42+00:00 2026-10-06T19:24:42+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T19:24:42+00:00 urn:sha1:8df4ee7a383bf9d29ba40c2f19d2adb4bc3f5bcd 2026-10-06T19:19:54+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T19:19:54+00:00 urn:sha1:dc5b6507889d07003cf01ed1d784c0faf48bec03 2026-10-06T18:23:29+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T18:23:29+00:00 urn:sha1:039daee13c5bac50919eff1ca26977ac49e37b06 2026-10-06T17:35:23+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T17:35:23+00:00 urn:sha1:61c2434533045524dfbb70e4d9aa82c08a5272db - New mode 29 (GOLDEN_EXEC_LAST): identical to mode 28 but skips the TURING_COMPUTE_A alloc on the client-wired golden channel (every GR object construct there blocks RM); stage 3 completes with the golden handle swapped and BIND/GPFIFO_SCHEDULE/token are accepted. Param clamp 0..29. - Shape bits: bit6 TSG parent (alloc accepted, same no-fetch), bit7 host USERD control offset 0 (THE FETCH FIX: the server applies the sysmem userd_mem base directly and ignores the captured USERD_INDEX_VALUE=3, so GP_PUT/GP_GET live at +0x8c/+0x88; m14: GP_GET advanced 1), bit8 pre-promote compute object (invalid order: RM blocked -110 + NOCAT 0x52a8b04). - Failure diagnostics: REAL GR SEM FAILED now dumps both candidate USERD control offsets (ctl and alt). 2026-10-06T15:57:33+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T15:57:33+00:00 urn:sha1:3f892b2924c0bdd15aaa04899b879601bd263981 - Mode 28 golden execution lane behind gsp_phys_rmcall_gr_promote=28 with a shape bitmask (gsp_phys_rmcall_golden_exec_shape: ring / entries=8 / sysmem USERD / USERD size / hObjectBuffer=VAS / skip replay TURING_A) and a USERD control-offset helper. Finding: the RM-managed golden channel hangs any GR object construct (-110, no assert) as soon as client submission wiring (ring or sysmem USERD) is attached, so only the captured server-owned shape constructs; the machinery is kept for future wiring ideas. - fwclient mask bit 11 (0x800): send each non-MAIN FWCLIENT promote entry as its own one-entry control and continue past refusals. V6 acceptance matrix: PM, PATCH, PRIV_ACCESS_MAP, UNRESTRICTED_PRIV_ACCESS_MAP accepted, FECS_EVENT refused 0x1f. - fwclient mask bit 12 (0x1000): golden9 VA-only global bookings (BUNDLE_CB, PAGEPOOL, ATTRIBUTE_CB, RTV_CB_GLOBAL) accepted on V6; bits 13/14 (0x2000/0x4000): FECS PA-only (refused 0x1f) and FECS VA-only (accepted). - gsp_phys_rmcall_srv_main_ignore: ignore a server-reported MAIN in the srv-ctx commit and force the client INITIALIZE_CTX + VA-only fallback. - gsp_sema_service: pool semaphores never fall back to the learned map; queue the absolute release via svc_pending_add until svc_pool_pa_resolve succeeds, and judge pool slots through the verified resolver in svc_apply_pending and the release decode (UVM registration stall fix). 2026-10-06T12:01:32+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-06T12:01:32+00:00 urn:sha1:4612968b4429c90e2df057f3d92d849e82d6342e 2026-10-05T21:16:18+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-05T21:16:18+00:00 urn:sha1:fc8d7923c83c6babd0ee8c23565ac18b709fa5a5 Ladder mode 25 reproduces the real 570.144 host client's golden-image construct on the golden replay handles: captured channel shape (flags 0x00200320, hObjectBuffer 0, gpFifoOffset 0, gpFifoEntries 0x20, engineType 1, host memdesc substitutions), a single atomic 9-entry GPU_PROMOTE_CTX on the golden channel (MAIN id0 and PATCH id2 combined, ids 3/4/5/6 VA-only globals, ids 9/10/11 FECS/PRIV/UNR combined), then the TURING_A 3D object. The golden VAS/channel/3D object stay alive and the existing V6 FWCLIENT promote follows on the golden-initialized GR-instance state; a failed golden step aborts with no retry and no follow-up promote. The captured VAS COPY_SERVER_RESERVED_PDES control is implemented gated (fwclient mask bit 8, zero-level no-op form) because its level PAs are server-internal. Mode clamp/name/help extended to 25; modes 1-24 unchanged. 2026-10-05T20:04:33+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-05T20:04:33+00:00 urn:sha1:7c1fceb5654cda3628531214934b93e96a507700 - gsp_phys_rmcall_fwclient_mask (default 0x3f): per-entry selection for the mode-24 FWCLIENT promote set; bit6 selects the MAIN UVM VA-only shape. - golden replay: tolerate the client-local system-memory PB step and continue with hObjectBuffer=0; on-ladder TURING_A 3D object retained best-effort. Live bisection on the KMD channel: MAIN alone reaches the per-buffer commit and stops at the engine-context memdesc state; PM-only and PATCH-only are accepted; any multi-entry control containing MAIN is refused 0x1f. All cycles release clean. 2026-10-05T19:58:43+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-05T19:58:43+00:00 urn:sha1:5a77352f78e6cd28280f2dc559f677d31ae25c38 - golden replay (gsp_phys_rmcall_golden, default off): replay the stock client's post-load golden channel allocations (separate VAS, pushbuffer objects, USERD, bare GR channel, TURING_A 3D object) before the ladder channel; best-effort: a failure warns and the ladder continues. - on-ladder TURING_A (0xc597) 3D object allocation before the compute object (best-effort) to initialize server-side GR-instance state. - promote mode 24: the reference FWCLIENT non-3D set (MAIN, PM, PATCH, FECS_EVENT, PRIV_ACCESS_MAP, UNRESTRICTED_PRIV_ACCESS_MAP) as one GPU_PROMOTE_CTX on the KMD channel, with per-entry logging and explicit omission semantics; mode clamps/descriptions extended to 24. Live: mode 23 soft-stops 0x1f on the server-managed shared channel and reaches the per-buffer commit on the KMD channel, where it stops at the missing engine-context memdesc; mode 24 emits all six entries and is refused with 0x1f before BIND. All cycles release clean, GPU green. 2026-10-05T19:10:01+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-05T19:10:01+00:00 urn:sha1:7e5c30f5b47ad215970ab9e5ad9c53a3b3ea6321 The hVirtMemory no-entry promote backed by the server-owned FBMEM context object (GSP_RM_ALLOC class 0x40) on the server-managed shared V5 channel. A physical memdesc bypasses the server-booked engine-ctx vaList and hands the memdesc straight to the per-buffer commit 0x5b00d2c, the one remaining promote shape on the stable shared+srvctx path. Runs grv23/grv23v6 soft-stop at PROMOTE_CTX hVirtMemory status=0x1f before BIND with clean releases.