qemu: add cpu_unregister_io_memory and make io mem table index dynamic (Marcelo Tosatti)
So drivers can clear their mem io table entries on exit back to unassigned state. Also make the io mem index allocation dynamic. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6601 c046a42c-6fe2-441c-8c8c-71466251a162
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