XenBus
You may hear the term XenBus thrown around in various contexts. There is
some confusion about exactly what this means, caused by the fact that the
same term is used to describe two things. In the Xen port of Linux, the term
is used to describe the interface to the XenStore. In a more general case, it is
used to describe a protocol for connecting to device drivers that is built on top
of the XenStore.
8.2 Navigating the XenStore
The Xen distribution includes a number of command-line tools for inspecting and
manipulating the store. These are the xenstore-* family, and can be used from
Domain 0. To get a full list of the contents of the XenStore, use the xenstore-ls
command.
# xenstore-ls
tool = ""
...
vm = ""
00000000-0000-0000-0000-000000000000 = ""
...
local = ""
...
8.2. Navigating the XenStore 143
The three top-level entities in the store are tool, vm, and local. The tool
hierarchy is used for tools to store information. This part of the hierarchy exists
to allow tools to have a uniform storage and communication mechanism, isolated
from the underlying ?¬?lesystem of Domain 0.
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