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XEN(4) Device Drivers Manual XEN(4)

xenXen domU nexus device

xen0 at pvbus?

xen driver performs HVM domU guest initialization, provides abstraction for virtual Xen interrupts, access to the XenStore configuration storage as well as a device probing facility for paravirtualized devices such as disk and network interfaces.

When running under XenServer, to let the host know that the guest has finished initializing and to allow graceful shutdown, set the following XenStore properties with hostctl(8) in rc.local(8):

ostype=$(sysctl -n kern.ostype)
osrelease=$(sysctl -n kern.osrelease)

# XenServer Tools version
hostctl attr/PVAddons/MajorVersion 6
hostctl attr/PVAddons/MinorVersion 2
hostctl attr/PVAddons/MicroVersion 0
hostctl attr/PVAddons/BuildVersion 76888
hostctl attr/PVAddons/Installed 1

# OS version
hostctl data/os_name "$ostype $osrelease"
hostctl data/os_uname $osrelease
hostctl data/os_distro $ostype

# Update XenStore
hostctl data/updated 1

autoconf(4), intro(4), pvbus(4)

The xen driver first appeared in OpenBSD 5.9.

The xen driver was written by Mike Belopuhov <> from scratch, inspired by the FreeBSD implementation.

July 21, 2017 OpenBSD-6.3