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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 29 Jan 2007 07:14:52 +1100

> > Which should be good enough to handle everything but RTAS.
> 
> You keep ignoring the problem then... we -HAVE- to handle the RTAS case.
> In addition, it's not unlikely that other virtualized environment will
> provide a similar very high level APIs to MSIs.

I believe sparc64 has similar issues to RTAS fwiw.