additional interfaces in XEN environment Post: 302172253

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LEARN ABOUT NETBSD

xenbus

XENBUS(4)						 BSD/xen 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 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 <bouyer@NetBSD.org>.

BSD
								  January 8, 2011							       BSD

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