Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=reg-probe 2026-10-01T18:42:38+00:00 2026-10-01T18:42:38+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-01T18:42:38+00:00 urn:sha1:69f0c2dbc4cd5f61302ae8d70002e1a1eb96da52 The working distribution driver runs with display enabled; the RmDisableDisplay=1 deviation changes board/display state and may be implicated in the devid/board validation failure blocking GSP-RM init. Regenerate the profile without it: the 35 host default parameters plus RMDevidCheckIgnore=1, 36 entries total, display brought up as a stock boot would. Same canonical packing: size 1344, numEntries 36, rpc.length 1376, record 1392 (8-byte aligned), one 4 KB element. The module is unchanged apart from comments and the prepared log line, which now reports 'host default profile + RMDevidCheckIgnore=1, display enabled'. 2026-10-01T18:12:22+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-01T18:12:22+00:00 urn:sha1:3fe0709d60dce46a2d74a95166dbb932c82ce0c5 Append RMDevidCheckIgnore=1 (dword) to the pre-boot SET_REGISTRY profile, after the 35 host default parameters and RmDisableDisplay=1. The key is the registry escape for the static-config devid/board check that currently fails GSP-RM init; every existing entry is unchanged. Regenerated kernel/gsp_phys_registry_img.h with the same canonical packing (values inline, names-only blob): size 1377, numEntries 37, rpc.length 1409, one 4 KB element. The module code is unchanged apart from comments: the submission and the prepared log line read the size and entry count from the generated blob/macros. 2026-10-01T17:49:50+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-01T17:49:50+00:00 urn:sha1:97e2d46daf7e26aface861bce24b767eaccc967c The pre-boot SET_REGISTRY (function 73) submitted an empty PACKED_REGISTRY_TABLE. Replace it with the default registry profile the host driver sends before boot: the 35 default dword parameters from its parameter table plus RmDisableDisplay=1. The display key makes the GSP-RM display-presence check treat display as absent, so the display engine is removed during pre-init instead of being brought up on a headless boot. The payload is generated into kernel/gsp_phys_registry_img.h as a PACKED_REGISTRY_TABLE blob (8-byte header, 36 16-byte dword entries, NUL-terminated names after the array; values inline; no value bytes in the name blob, matching the reference packer): size 1342, numEntries 36, rpc.length 1374, one 4 KB element. fn72 is unchanged. The payload length is not 8-byte aligned (record 1390 -> 1392); the TX producer already zero-pads the kvzalloc'd staging record and folds the XOR checksum over the padded length, exactly like the reference producer zero-pads before _checkSum32, so no producer change is needed. The blob is static const data: no heap, no new stack frame, and a submit failure still aborts the boot. The prepared log line now prints the payload size and entry count.