XENBUS(4) | Device Drivers Manual (xen) | XENBUS(4) |
xenbus
— Xen bus
abstraction for paravirtualized drivers
xenbus* at hypervisor?
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.
xenbus
interface, for communication with the XenStore database.The xenbus
driver first appeared in
NetBSD 3.0.
The xenbus
driver was written by
Manuel Bouyer
<bouyer@NetBSD.org>.
January 8, 2011 | NetBSD 10.99 |