Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-6.0-20201214' into staging

ppc patch queue 2020-12-14

Here's my first pull request for qemu-6.0, with a bunch of things
queued over the freeze.  Highlights are:
 * A bunch of cleanups to hotplug error paths from Greg Kurz
 * A number of TCG fixes from new contributor Giuseppe Musacchio
 * Added Greg Kurz as co-maintainer
 * Assorted other bugfixes and cleanups

This supersedes ppc-for-6.0-20201211, the only change are some patch
authors to better match qemu conventions.

# gpg: Signature made Mon 14 Dec 2020 04:57:09 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/dg-gitlab/tags/ppc-for-6.0-20201214: (30 commits)
  spapr.c: set a 'kvm-type' default value instead of relying on NULL
  spapr: Pass sPAPR machine state to some RTAS events handling functions
  spapr: Don't use qdev_get_machine() in spapr_msi_write()
  spapr: Pass sPAPR machine state down to spapr_pci_switch_vga()
  target/ppc: Introduce an mmu_is_64bit() helper
  ppc/translate: Use POWERPC_MMU_64 to detect 64-bit MMU models
  ppc/e500: Free irqs array to avoid memleak
  MAINTAINERS: Add Greg Kurz as co-maintainer for ppc
  hw/ppc: Do not re-read the clock on pre_save if doing savevm
  target/ppc: Remove "compat" property of server class POWER CPUs
  spapr: spapr_drc_attach() cannot fail
  spapr: Simplify error path of spapr_core_plug()
  spapr: Abort if ppc_set_compat() fails for hot-plugged CPUs
  spapr: Fix pre-2.10 dummy ICP hack
  xive: Add trace events
  hw/ppc/spapr_tpm_proxy: Fix hexadecimal format string specifier
  ppc/translate: Rewrite gen_lxvdsx to use gvec primitives
  ppc/translate: Raise exceptions after setting the cc
  ppc/translate: Delay NaN checking after comparison
  ppc/translate: Turn the helper macros into functions
  ...

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