Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-2.12-20180117' into staging

ppc patch queue 2017-01-17

Another pull request for ppc related patches.  The most interesting
thing here is the new capabilities framework for the pseries machine
type.  This gives us better handling of several existing
incompatibilities between TCG, PR and HV KVM, as well as new ones that
arise with POWER9.  Further, it will allow reasonable handling of the
advertisement of features necessary to mitigate the recent CVEs
(Spectre and Meltdown).

In addition there's:
     * Improvide handling of different "vsmt" modes
     * Significant enhancements to the "pnv" machine type
     * Assorted other bugfixes

# gpg: Signature made Wed 17 Jan 2018 02:21:50 GMT
# gpg:                using RSA key 0x6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>"
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-2.12-20180117: (22 commits)
  target-ppc: Fix booke206 tlbwe TLB instruction
  target/ppc: add support for POWER9 HILE
  ppc/pnv: change initrd address
  ppc/pnv: fix XSCOM core addressing on POWER9
  ppc/pnv: introduce pnv*_is_power9() helpers
  ppc/pnv: change core mask for POWER9
  ppc/pnv: use POWER9 DD2 processor
  tests/boot-serial-test: fix powernv support
  ppc/pnv: Update skiboot firmware image
  spapr: Adjust default VSMT value for better migration compatibility
  spapr: Allow some cases where we can't set VSMT mode in the kernel
  target/ppc: Clarify compat mode max_threads value
  ppc: Change Power9 compat table to support at most 8 threads/core
  spapr: Remove unnecessary 'options' field from sPAPRCapabilityInfo
  hw/ppc/spapr_caps: Rework spapr_caps to use uint8 internal representation
  spapr: Handle Decimal Floating Point (DFP) as an optional capability
  spapr: Handle VMX/VSX presence as an spapr capability flag
  target/ppc: Clean up probing of VMX, VSX and DFP availability on KVM
  spapr: Validate capabilities on migration
  spapr: Treat Hardware Transactional Memory (HTM) as an optional capability
  ...

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