> but you'd need a huge bitmap for 64k ports for many (not too recent) cards
> because of the great sparse IBM 8514A register layout:(
8192 bytes, and it can be solved that only _that_ process has such a large
bitmap.
> and in/out instructions take quite a few more cycles for every bitmap access.
3 cycles instead of 1 (if that cacheline is cached), is that really such a
big problem?
> and this all won't protect your system from graphics chips going cracy and
> locking up e.g. the PCI bus due to bad values in correct registers
> (not an uncommon problem at least for S3 chip;)
yep but it will probably prevent a few hundred 'guest roots' ;)
-- mingo
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