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_emulation.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'kernel/gsp_emulation.c') diff --git a/kernel/gsp_emulation.c b/kernel/gsp_emulation.c index 5b75ec6..b1c67a4 100644 --- a/kernel/gsp_emulation.c +++ b/kernel/gsp_emulation.c @@ -742,14 +742,15 @@ int gsp_emu_init(struct nv_vgpu_device *vgpu) /* Physical GSP boot emulation state. wpr2_addr_lo matches what the * guest driver expects WPR2_ADDR_LO to read after FWSEC FRTS: - * frtsOffset = fbSize - reservedFromEnd. With fbSize = 256MB - * (LOCAL_MEMORY_RANGE) and the 570.144 image's 2MB reservation, - * frtsOffset = 0x10000000 - 0x200000 = 0xfe00000; the register's - * _VAL field (bits31:4) must equal frtsOffset >> 12 = 0xfe00, so the - * raw register value is 0xfe000. */ + * frtsOffset = fbSize - reservedFromEnd. With fbSize = 512MB + * (LOCAL_MEMORY_RANGE / GSCI fb_length) and the 570.144 image's 2MB + * reservation, frtsOffset = 0x20000000 - 0x200000 = 0x1fe00000; the + * register's _VAL field (bits31:4) must equal frtsOffset >> 12 = + * 0x1fe00, so the raw register value is 0x1fe000. Kept in lockstep + * with GSCI fb_length/frtsOffset and NV_PFB_PRI_MMU_LOCAL_MEMORY_RANGE. */ ctx->boot_stage = 0; /* GSP_BOOT_STAGE_IDLE */ ctx->flcn_kick_count = 0; - ctx->wpr2_addr_lo = 0x000fe000; + ctx->wpr2_addr_lo = 0x001fe000; /* The guest's BAR0 is the emulation shadow (vzalloc'd by * nv_vgpu_bar_emul_init, mapped to the guest via VFIO mmap) - NOT the -- cgit v1.2.3