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NetBSD 6.1.5 - man page for xenbus (netbsd section 4)

XENBUS(4)			   BSD Kernel Interfaces Manual 			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 func-
     tionality 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 Xen-
     Store 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 <bouyer@NetBSD.org>.

BSD					 January 8, 2011				      BSD


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