Merge tag 'kvm-ppc-next-4.20-2' of...

Merge tag 'kvm-ppc-next-4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD

Second PPC KVM update for 4.20.

Two commits; one is an optimization for PCI pass-through, and the
other disables nested HV-KVM on early POWER9 chips that need a
particular hardware bug workaround.