Merge remote-tracking branch 'remotes/powerpc/topic/ppc-kvm' into kvm-ppc-next

This merges in the ppc-kvm topic branch from the powerpc tree to get
patches which touch both general powerpc code and KVM code, one of
which is a prerequisite for following patches.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>