KVM fixes for 3.11

On the x86 side, there are some optimizations and documentation updates.
The big ARM/KVM change for 3.11, support for AArch64, will come through
Catalin Marinas's tree.  s390 and PPC have misc cleanups and bugfixes.

There is a conflict due to "s390/pgtable: fix ipte notify bit" having
entered 3.10 through Martin Schwidefsky's s390 tree.  This pull request
has additional changes on top, so this tree's version is the correct one.
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