Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=cs-share 2026-09-24T14:48:08+00:00 2026-09-24T14:48:08+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-24T14:48:08+00:00 urn:sha1:13c07f7585c71bb75870d2a25475b4c9401a57fc The pin table became the primary VA->PA store once push-buffer regions and bridged client mappings started adding thousands of pages per boot; at 8192 slots with an 8-probe window, inserts were silently dropped and lookups missed at half load. 32768 slots and a 32-probe window keep the mapped set intact. tools/guest-diag/{guest_pmap_all.py,bridge_sems.sh} translate the CUDA client's /dev/nvidia* mappings through the guest's own pagemap and inject each present page into the service as a sysmem pin. With the client's semaphore pages pinned the service applies their releases into the page the client polls (verified: applied 67 -> 109, misses stop growing for those VAs), where before every write went to the vidmem shadow.