https://bugzilla.kernel.org/show_bug.cgi?id=53761





--- Comment #1 from Nadav Har'El <[email protected]>  2013-02-25 
13:59:58 ---
The same technique, and code, can be reused also for merging of IO bitmaps.
This will offer less of a performance impact than that on MSR bitmaps, because
the KVM L0 anyway wants exit on all IO ports (except the esoteric port 0x80
used for delays). So I am guessing no performance improvement will be seen
because of merging IO bitmaps.

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