SGI UV cross-partition (XP/XPC/XPNET) communication drivers
Cross-partition messaging code for SGI's UV-series NUMAlink supercomputers, the very large Xeon-based scale-up systems SGI sold in the late 2000s and early 2010s. It lets multiple Single System Image partitions on the same NUMAlink fabric exchange messages and present a virtual network interface to each other.
recommendation
A candidate for future removal because the hardware it targets is a niche, discontinued SGI scale-up platform; HPE, which absorbed SGI, has moved its large partitionable x86 line to Superdome Flex instead. Recent commits in 2023 and 2025 have been incidental cleanups (IA-64 removal fallout, treewide timer API churn) rather than active work. With no in-kernel replacement for this SSI transport, an annotated deprecation seems wiser than immediate removal while remaining UV systems age out.
repository signals
sources
- git.kernel.org
`CONFIG_SGI_XP` is for communication between SGI Single System Images and depends on `X86_UV`, tying this directory to SGI UV hardware.
- lore.kernel.org
Recent 2025 touches to `xpc_main.c` came from timer treewide cleanups, indicating build-maintenance rather than active feature work on SGI-XP hardware.
- lore.kernel.org
`xp_uv.c` was touched by the 2023 RFC removing IA-64, showing adjacent platform-pruning work around this niche SGI code rather than renewed platform investment.
- de.wikipedia.org
SGI UV is a specialized Intel Xeon NUMAlink large-memory server family, consistent with a niche scale-up platform rather than broad contemporary deployment.
- support.hpe.com
HPE's current large x86 partitionable scale-up server line is Superdome Flex, suggesting SGI UV-era SSI systems are legacy rather than current-new deployments.
codex reasoning notes (technical)
SGI-XP is real driver code, not a helper library: local tree inspection and canonical recall of the kernel.org Kconfig page show it is an SGI SSI communication driver gated by `X86_UV`. Lore evidence was obtained with `lore_file_timeline` on `drivers/misc/sgi-xp/xpc_main.c` and `drivers/misc/sgi-xp/xp_uv.c`; the visible 2025 activity is treewide timer churn, and the notable 2023 hit is IA-64 removal fallout, with no clear removal series for `drivers/misc/sgi-xp` itself. Deployment looks low because SGI UV is a niche legacy NUMAlink platform and current HPE scale-up offerings are Superdome Flex instead; that current-product evidence came from web search, while the SGI UV family description came from web search to Wikipedia. I do not see a natural upstream replacement driver for the same SSI transport, so this looks more like deprecate/annotate-for-legacy than immediate removal.