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XENBUS(4) NetBSD/xen Kernel Interfaces Manual XENBUS(4)
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by Kimmo Suominen.
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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 com-
mands, ...). 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 acces-
sible to all domains. For this reason, it also has an event channel
associated to it, so that domains can post messages to the XenStore
xenbus0: using event channel %d The event channel associated to the
xenbus interface, for communication with the XenStore database.
pciback(4), xbd(4), xbdback(4), xennet(4), xpci(4), xvif(4)
The xenbus driver first appeared in NetBSD 3.0.
The xenbus driver was written by Manuel Bouyer <bouyer@NetBSD.org>.
NetBSD 9.2 January 8, 2011 NetBSD 9.2