Glossary
========

Hypervisor
----------
System management software that runs at a higher privileged level than any
operating system or application software. It furthermore defines if software
at lower privilege levels has direct access to resources, if access should be
denied or trapped and the hypervisor code invoked on such events.

Hypervisor Mode
---------------
Execution mode of a CPU while executing hypervisor code.

Guest Mode
----------
Execution mode of a CPU while executing an operating system or application
software in an isolated environment under the control of the hypervisor.

Cell
----
Protection domain for an operating systems with its application software in
the context of Jailhouse. A cell is granted exclusive or intercepted and
moderated access to system resources like CPUs, RAM or I/O devices.

Root Cell
---------
The cell that contains the Linux system which originally started Jailhouse.
The root cell cannot be destroyed, thus exists as long as Jailhouse is active.

Non-Root Cell
-------------
Any cell started after the root cell under the control of Jailhouse. There can
be as many non-root cells as required resources are available, Non-root cells
can be destroyed under certain conditions while Jailhouse is running.

Sysfs
-----
Linux filesystem that provides a means to export kernel data structures, their
attributes, and the linkages between them to userspace.