---
name: "vbus"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/vbus"
---

# vbus(4)

virtual device bus

## NAME

**vbus** – virtual device bus

## SYNOPSIS

**vbus0 at mainbus0**

## DESCRIPTION

The **vbus** driver provides a virtual bus for virtual devices provided by the UltraSPARC Hypervisor as found on sun4v systems and logical domains.

OpenBSD provides support for the following devices:

- [cbus(4)](/cbus/4.md)

  channel device bus

- [vcons(4)](/vcons/4.md)

  virtual console interface

- [vrng(4)](/vrng/4.md)

  virtual random number generator

- [vrtc(4)](/vrtc/4.md)

  virtual real-time clock

## SEE ALSO

[intro(4)](/intro/4.md)

## HISTORY

The **vbus** driver first appeared in OpenBSD 4.4.

## AUTHORS

The **vbus** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.