Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=stallfree 2026-10-18T04:26:02+00:00 2026-10-18T04:26:02+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-18T04:26:02+00:00 urn:sha1:ff11994cbc1cce45e5ce721c69c7957436031877 Dead-pid purge via in-band #nopid (zombie-aware probe), monotonic (pid,starttime) client identity so trace-ring replays can never reset an active client (fixes the m178 mid-run reset regression avenue), pre-capture and post-capture stall watchdogs that re-assert pins and escalate loudly, heartbeat threads for both tools, supervisor STALE 75s/GRACE 120s. 2026-10-18T00:35:21+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-18T00:35:21+00:00 urn:sha1:b16269daec0ca5838b8343e9b5f4cabd23015167 The m178 tool latching changes caused a reproducible pre-capture hang of the third CUDA client after two green clients (r199: smiley #3; r200: multikernel #3; both recovered by reverting tools only, r201). Prime suspect: semfix per-client reset re-firing mid-run (same pid reset twice 2 min apart while the client was active). Tools restored to the m177-proven state until the reset logic is fixed with a monotonic per-pid guard. 2026-10-17T23:18:50+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-17T23:18:50+00:00 urn:sha1:33de4c9bc524ac27582fde5911ad32d89d0a7de9 Kernel: authorship instrumentation + swrel gate for in-flight GR release VAs; first-poll shortening + fast extended re-arm (params gr_retry_fast=1, gr_first_poll_ms=2500); per-attempt win0 bank recompute + shadow recopy in the outcome-retry loop; poll-break/deposit-readback diagnostics; C1-C10 sema diagnostics (crel-entry, relx, opdef-clear, walk, pub-adv, hold-fallback, busy-defer, CAND-OVERWRITE, inline recs); busy-defer hold instead of software-release consume; counter fast path; QMD word 48/49 skip. Tools: heartbeat thread, scanner-alive probe on reinstall, full periodic re-assert, #nopid handling, per-client reset fix (debounce), dead-pid drop, supervisor grace+threshold. 2026-10-17T21:51:19+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-17T21:51:19+00:00 urn:sha1:78ac3864039e066354181cb6b53c92e96d86ff3e (1) svc_session_flush keeps svc.direct_base (per-boot constant; the pin-free targeted scanner's gate/input) and a new gsp_sema_service_guest_reset() hook wipes boot-scoped discovery state on guest RM reload; (2) counter-page derive now takes the first READABLE source (vaspaces -> discovered -> targeted) instead of failing -EIO on a walked-but-garbage page, with one-shot diagnostics; (3) new m177c UVM ring-space directory discovery: content-verified (push_va -> push_pa) samples from the GR content discovery and CE push pairing feed a second discovered-directory slot (walks the 0x2xxxxxxx family), consulted by svc_walk_discovered; (4) GR channels now deliver withheld opdef sets at entry consume (normal tail and the stale-skip path) instead of waiting for the 10 s sweep; (5) host tools hardened: semfix_uvmt QMP reconnect + pid-generation dedupe + stale-sem eviction + post-success pin latch + heartbeats; pin_gr_stream accept timeout + guest-scanner reinstall backoff + restart loop + subprocess timeouts; new pin_supervisor.sh (heartbeat watchdog, capped restarts) wired into start_vm_keep.sh. Evidence: r194-r196 cycles; pool resolves src=trusted pin-free; ring dir 0x10801c000 found 4/4; row: 'rel-apply ... written' with tools up.