Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-4.2-20191126' into staging

ppc patch queue for 2019-11-26

Here's the first 4.2 hard freeze pull request from me.  This has:

  * A fix for some testcases that cause errors on older host kernels
    (e.g. RHEL7), with our new default configuration of VSMT mode
  * Changes to make VFIO devices interact properly with change of irq
    chip caused by PAPR feature negotiation.  This is more involved
    than I would like, but it's a problem in real use cases and I
    can't see an easier way to handle it.
  * Fix an error with ms6522 counters for the g3beige machine
  * Fix a coverity warning

# gpg: Signature made Tue 26 Nov 2019 05:52:16 GMT
# gpg:                using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-4.2-20191126:
  ppc/spapr_events: fix potential NULL pointer dereference in rtas_event_log_dequeue
  mos6522: update counters when timer interrupts are off
  spapr: Work around spurious warnings from vfio INTx initialization
  spapr: Handle irq backend changes with VFIO PCI devices
  vfio/pci: Respond to KVM irqchip change notifier
  vfio/pci: Split vfio_intx_update()
  kvm: Introduce KVM irqchip change notifier
  pseries: fix migration-test and pxe-test

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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