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docs: Document how libvirt handles companion controllers

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The information on companion controllers we give in our documentation is
rather sparse.  For example, it looks like any controller can be used as
a companion one.  Also, when using ich9-uhci2, for example, we are able
to set some sensible defaults, but it might get confusing for the user
as we don't do that for all controller models.

https://bugzilla.redhat.com/show_bug.cgi?id=1069590

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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Martin Kletzander 2015-07-13 15:51:25 +02:00
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@ -3005,6 +3005,11 @@
relationship of the companion to its master controller.
A companion controller is on the same bus as its master, so
the companion <code>index</code> value should be equal.
Not all controller models can be used as companion controllers
and libvirt might provide some sensible defaults (settings
of <code>master startport</code> and <code>function</code> of an
address) for some particular models.
Preferred companion controllers are <code>ich-uhci[123]</code>.
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