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

x86 and machine queue, 2016-09-27

# gpg: Signature made Tue 27 Sep 2016 21:10:06 BST
# gpg:                using RSA key 0x2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-pull-request:
  sysbus: Remove ignored return value of FindSysbusDeviceFunc
  target-i386: Remove has_msr_* global vars for KVM features
  target-i386: Clear KVM CPUID features if KVM is disabled
  target-i386: Remove has_msr_hv_tsc global variable
  target-i386: Remove has_msr_hv_apic global variable
  target-i386: Remove has_msr_mtrr global variable
  target-i386: Move xsave component mask to features array
  target-i386: xsave: Calculate set of xsave components on realize
  target-i386: xsave: Helper function to calculate xsave area size
  target-i386: xsave: Simplify CPUID[0xD,0].{EAX,EDX} calculation
  target-i386: xsave: Calculate enabled components only once
  target-i386: Don't try to enable PT State xsave component
  target-i386: Move feature name arrays inside FeatureWordInfo
  linux-user: remove #define smp_{cores, threads}
  target-i386: Enable CPUID[0x8000000A] if SVM is enabled
  target-i386: Automatically set level/xlevel/xlevel2 when needed
  tests: Test CPUID level handling for old machines
  tests: Add test code for CPUID level/xlevel handling
  target-i386: Add a marker to end of the region zeroed on reset
  target-i386: Remove unused X86CPUDefinition::xlevel2 field

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