Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-4.0-20190329' into staging

ppc patch queue 2019-03-29

Here's a set of bugfixes for ppc, aimed at qemu-4.0 during hard freeze.

We have one cleanup that's not strictly a bugfix, but will avoid an
ugly external interface making it to a released version.

We have one change to generic code to tweak the semantics of
qemu_getrampagesize() which fixes a bug for ppc.  This does have a
possible impact on s390x which uses this function for a different
purpose.  I've discussed with David Hildenbrand and Igor Mammedov,
however and we think it won't immediately break anything due to some
existing bugs in the s390 usage.  David H will be following up with
some s390 fixes in that area.

# gpg: Signature made Fri 29 Mar 2019 03:27:49 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-4.0-20190329:
  exec: Only count mapped memory backends for qemu_getrampagesize()
  spapr/irq: Add XIVE sanity checks on non-P9 machines
  spapr: Simplify handling of host-serial and host-model values
  target/ppc: Fix QEMU crash with stxsdx
  target/ppc: Improve comment of bcctr used for spectre v2 mitigation
  target/ppc: Consolidate 64-bit server processor detection in a helper
  target/ppc: Enable "decrement and test CTR" version of bcctr
  target/ppc: Fix TCG temporary leaks in gen_bcond()

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