From 31594b263cc4fbe30ebbe412a4a788f726f03a02 Mon Sep 17 00:00:00 2001 From: Arthur Hanson Rasmusson Date: Sun, 4 Oct 2026 16:19:31 -0400 Subject: vgsp: end-to-end CUDA acceptance in the guest The no-claim emulation path now runs a stock CUDA program end to end: device properties, cudaMalloc, a GPU-authored string kernel read back byte-for-byte, two 4 MB host-to-device copies, a 1 M-element vectorAdd executed on the physical GPU through the host bridge, and the device-to-host copy-back verified element by element. Three consecutive supervised cycles report MAIL + VADD bad=0 checksum=392344090.500000 + STATUS OK with identical input/output hashes. Two data-path correctness fixes make the transfers sound: - Once-only op execution per GPFIFO entry. The pump replays recently consumed ring entries when translation batches are injected so missed releases can land; re-executing a CE copy is not idempotent because its source is a client staging buffer that may have been refilled. Slots now record their raw entry words and a replayed entry matching that identity suppresses operations while still processing releases. - Per-page translation of virtual operands. svc_copy resolved only the first page of a VA range and walked the PA linearly; client staging ranges are frequently split (observed 195 + 61 pages), so the tail of alternating chunks was read from unrelated memory. Multi-page copies now re-resolve each 4 KB page through the trusted resolver. Also carries the earlier uncommitted emulation fixes that got the client to the launch (QMD address-window gate, counter registration persistence, 512 MiB emulated FB, bridge slot hygiene) and bounded diagnostics (sema-bigop, sema-bigcopy, bridge-in/out hashes, daemon INCHECK/OUTCHECK/dumps). --- kernel/gsp_sema_service.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'kernel/gsp_sema_service.h') diff --git a/kernel/gsp_sema_service.h b/kernel/gsp_sema_service.h index 530663e..22e9edc 100644 --- a/kernel/gsp_sema_service.h +++ b/kernel/gsp_sema_service.h @@ -209,6 +209,13 @@ extern u64 gsp_sema_copy_dst2; /* CE pending-entry grace window in ms before the release fallback fires. */ extern unsigned gsp_sema_ce_grace_ms; +/* + * Bounded work-before-release hold (ms) for an unreadable CE entry whose + * translation/pins typically land 0.5-2 s late (observed via the deferred + * retry probe). Absolute deadline per entry, never reset; 0 disables. + */ +extern unsigned gsp_sema_push_hold_ms; + /* * Grace window (ms) an untranslatable GR GPFIFO entry is left pending before * the pump consumes it as stale. The GR push pages are pinned from guest -- cgit v1.2.3