stable/for-linus-3.4-rc1-tag

Two fixes for regressions:
 * one is a workaround that will be removed in v3.5 with proper fix in the tip/x86 tree,
 * the other is to fix drivers to load on PV (a previous patch made them only
   load in PVonHVM mode).

The rest are just minor fixes in the various drivers and some cleanup in the
core code.
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