[Xen-devel] [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough

[Simon Horman <horms@xxxxxxxxxxxx>]

This series starts of with servaral cleanup patches.

The meat of the changes start with the patch
"ioemu: use devfn instead of slots as the unit for passthrough"

This allows multi-function cards to be appear in guets as
multi-function cards, with the restriction that function 0 must
be passed through. Otherwise each function is allocated its own
slot, as before.

e.g.

1. Function 0 and two other functions of a multi-function card are
passed through, and the function numbers are maintained in the guest.

Physical                     Guest
0:1b.0    - pass through ->  0:6.0
0:1b.1    - pass through ->  0:6.1
0:1b.2    - pass through ->  0:6.2

2. Two functions other than zero of a multi-function card are
passed through. Each function is represent as function 0 of a slot
in the guest.

Physical                     Guest
0:1b.1    - pass through ->  0:6.0
0:1b.2    - pass through ->  0:7.0

Patches are also supplied to allow the virtual slot and device
to be supplied in the domain's configuration file. Amongst
other things this allows the existing assignment behaviour
to be specified.

Currently hotplug is not working with this scheme.
I am unsure of why, but am working towards a fix.

These patches are against qemu-xen-unstable.git
3f23188224b7ce69fcf13f52cb1c7977a5372900 as subsequent
revisions do not seem to work for me.

http://lists.xensource.com/archives/html/xen-devel/2009-02/msg00580.html

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en


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