Updated: 2021/Apr/14

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

     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 9.99                     January 8, 2011                    NetBSD 9.99