On Nov 20, 2003, at 1:44 AM, YAMAMOTO Takashi wrote:

> this reminds me of my old patches.. (attached)

Ah, this would be to eliminate the need to even map stuff into KVM at 
all, unless the underlying driver really needed to do so (e.g. for 
PIO).

Yes, I would like to see that in our tree one of these days.  We could 
squeeze a fair bit more performance out of the I/O subsystem by 
eliminating all of that silly MMU frobbing.

         -- Jason R. Thorpe <thorpej@wasabisystems.com>