Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-2.6-20160324' into staging

ppc patch queue for 2016-03-24

Accumulated patches for target-ppc, pseries machine type and related
devices.

* Preliminary patches from BenH & Cédric Le Goater's powernv code
    * We don't want the full machine type before 2.7
    * Adding some of the SPRs also fixes migration corner cases for
      spapr (when qemu has no knowledge of the registers, they're
      obviously not migrated)
    * We include some patches that aren't strictly fixes, but make
      applying the others easier, and they're low risk
* Fix to buffer management which significantly improves throughput in
  the spapr-llan virtual network device
* Start with 64-bit mode enabled on spapr.  This is the way it's
  supposed to be but we broke it a while back and didn't notice
  because Linux guests cope anyway.
    * Picked up by kvm-unit-tests
    * Still some bugs here that I'm working on

# gpg: Signature made Thu 24 Mar 2016 04:29:42 GMT using RSA key ID 20D9B392
# 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: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-2.6-20160324:
  ppc: move POWER8 Book4 regs in their own routine
  hw/net/spapr_llan: Enable the RX buffer pools by default for new machines
  hw/net/spapr_llan: Fix receive buffer handling for better performance
  hw/net/spapr_llan: Extract rx buffer code into separate functions
  ppc: A couple more dummy POWER8 Book4 regs
  ppc: Add dummy CIABR SPR
  ppc: Add POWER8 IAMR register
  ppc: Fix writing to AMR/UAMOR
  ppc: Initialize AMOR in PAPR mode
  ppc: Add dummy SPR_IC for POWER8
  ppc: Create cpu_ppc_set_papr() helper
  ppc: Add a bunch of hypervisor SPRs to Book3s
  ppc: Add macros to register hypervisor mode SPRs
  ppc: Update SPR definitions
  spapr/target-ppc/kvm: Only add hcall-instructions if KVM supports it
  ppc64: set MSR_SF bit

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

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