XENBUS(4) FreeBSD Kernel Interfaces Manual (xen) XENBUS(4)
NAME
xenbus - Xen bus abstraction for paravirtualized drivers
SYNOPSIS
xenbus* at hypervisor?
DESCRIPTION
The xenbus interface offers an abstraction layer used for communications
between domains. xenbus is mainly used by split paravirtualized drivers,
so backend and frontend devices can exchange configuration information,
properties, and statistics.
xenbus is not used for data transfer (network frames, blocks, PCI
commands, ...). This 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.
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.
DIAGNOSTICS
xenbus0: using event channel %d The event channel associated to the
xenbus interface, for communication with the XenStore database.
SEE ALSO
pciback(4), xbd(4), xbdback(4), xennet(4), xpci(4), xvif(4)
HISTORY
The xenbus driver first appeared in NetBSD 3.0.
AUTHORS
The xenbus driver was written by Manuel Bouyer <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 January 8, 2011 FreeBSD 14.1-RELEASE-p8