ppc patch queue 2019-05-29

Next pull request against qemu-4.1.  Highlights:
  * KVM accelerated support for the XIVE interrupt controller in PAPR
    guests
  * A number of TCG vector fixes
  * Fixes for the PReP / 40p machine
  * Improvements to make check-tcg test coverage

Other than that it's just a bunch of assorted fixes, cleanups and
minor improvements.

This supersedes both the pull request dated 2019-05-21 and the one
dated 2019-05-22.  I've dropped one hunk which I think may have caused
the check-tcg failure that Peter saw (by enabling the ppc64abi32
build, which I think has been broken for ages).  I'm not entirely
certain, since I haven't reproduced exactly the same failure.

# gpg: Signature made Wed 29 May 2019 07:49:04 BST
# 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-4.1-20190529: (44 commits)
  ppc/pnv: add dummy XSCOM registers for PRD initialization
  ppc/pnv: introduce new skiboot platform properties
  spapr: Don't migrate the hpt_maxpagesize cap to older machine types
  spapr: change default interrupt mode to 'dual'
  spapr/xive: fix multiple resets when using the 'dual' interrupt mode
  docs: provide documentation on the POWER9 XIVE interrupt controller
  spapr/irq: add KVM support to the 'dual' machine
  ppc/xics: fix irq priority in ics_set_irq_type()
  spapr/irq: initialize the IRQ device only once
  spapr/irq: introduce a spapr_irq_init_device() helper
  spapr: check for the activation of the KVM IRQ device
  spapr: introduce routines to delete the KVM IRQ device
  sysbus: add a sysbus_mmio_unmap() helper
  spapr/xive: activate KVM support
  spapr/xive: add migration support for KVM
  spapr/xive: introduce a VM state change handler
  spapr/xive: add state synchronization with KVM
  spapr/xive: add hcall support when under KVM
  spapr/xive: add KVM support
  spapr: Print out extra hints when CAS negotiation of interrupt mode fails
  ...

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