XENBUS(4)

📦 version 11.0, in nixpkgs unstable

okay so bestie, this is XENBUS(4) from the xen Kernel Interfaces Manual, and we're gonna get you comfy with the Xen bus abstraction 💅✨

🌸 NAME 🌸

xenbus — the Xen bus abstraction for paravirtualized drivers, periodt 🦋

🎀 SYNOPSIS 🎀

xenbus* at hypervisor?

💖 DESCRIPTION 💖

The xenbus interface is an abstraction layer used for communications between domains, no cap. It's mainly used by split paravirtualized drivers, so backend and frontend devices can exchange configuration information, properties, and statistics. Slay for teamwork 🫶

xenbus is not used for data transfer (network frames, blocks, PCI commands, ...). That functionality is implemented by each paravirtualized driver independently, typically via shared memory pages and an event channel that serves as a virtual interrupt, for signaling. So like, xenbus handles the vibes and the config, not the actual data payload 🔥

The xenbus abstraction offers guests the possibility to read and write information directly from and to XenStore, a centralized database accessible to all domains. For this reason, it also has an event channel associated to it, so that domains can post messages to the XenStore facility. Very main character energy for a bus, honestly 👑

🚨 DIAGNOSTICS 🚨

  • xenbus0: using event channel %d — the event channel associated to the xenbus interface, for communication with the XenStore database. That %d is literally the channel number, bestie 💀

👀 SEE ALSO 👀

🕰️ HISTORY 🕰️

The xenbus driver first appeared in NetBSD 3.0. iconic behavior ✨

💜 AUTHORS 💜

The xenbus driver was written by Manuel Bouyer <bouyer@NetBSD.org>. shoutout to the icon who wrote it 🫶

mwah 💖 — this page is from the Debian source/version, dated January 8, 2011, and it's the XENBUS(4) manual page. bye bestie, go read those SEE ALSO pages 🌈🎀

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