> IMO, the code needs a lot of cleanup. Personally I don't like the tons of
>
> #ifdef XEN
> ...
> #else
> ...
> #endif
>
> blocks. A few of them are ok, but they are too numerous now.

#ifdef's that switches by models make code hard to understand.  I'd
want to see #ifdef's by features (#ifdef HAS_FOO and #ifdef IS_BAR)
even in MD code.  IMHO.

Masao