Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

X86 queue, 2016-01-21

# gpg: Signature made Thu 21 Jan 2016 15:08:40 GMT using RSA key ID 984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"

* remotes/ehabkost/tags/x86-pull-request:
  target-i386: Add PKU and and OSPKE support
  target-i386: Add support to migrate vcpu's TSC rate
  target-i386: Reorganize TSC rate setting code
  target-i386: Fallback vcpu's TSC rate to value returned by KVM
  target-i386: Add suffixes to MMReg struct fields
  target-i386: Define MMREG_UNION macro
  target-i386: Define MMXReg._d field
  target-i386: Rename XMM_[BWLSDQ] helpers to ZMM_*
  target-i386: Rename struct XMMReg to ZMMReg
  target-i386: Use a _q array on MMXReg too
  target-i386/ops_sse.h: Use MMX_Q macro
  target-i386: Rename optimize_flags_init()

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