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kvm-x86-pmu-6.8

kvm-x86-pmu-6.8: KVM x86 PMU changes for 6.8:
tagged this 04 Jan 18:48 
 - Fix a variety of bugs where KVM fail to stop/reset counters and other state
   prior to refreshing the vPMU model.

 - Fix a double-overflow PMU bug by tracking emulated counter events using a
   dedicated field instead of snapshotting the "previous" counter.  If the
   hardware PMC count triggers overflow that is recognized in the same VM-Exit
   that KVM manually bumps an event count, KVM would pend PMIs for both the
   hardware-triggered overflow and for KVM-triggered overflow.
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