NAME
xenbus —
Xen bus abstraction for paravirtualized
drivers
SYNOPSIS
xenbus* at hypervisor?
DESCRIPTION
Thexenbus 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
xenbusinterface, for communication with the XenStore database.
SEE ALSO
HISTORY
The xenbus driver first appeared in
NetBSD 3.0.
AUTHORS
The xenbus driver was written by
Manuel Bouyer
<bouyer@NetBSD.org>.