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kvm-5.4-2

kvm-5.4-2: x86 KVM changes:
tagged this 27 Sep 11:46 
* The usual accuracy improvements for nested virtualization
* The usual round of code cleanups from Sean
* Added back optimizations that were prematurely removed in 5.2
  (the bare minimum needed to fix the regression was in 5.3-rc8,
  here comes the rest)
* Support for UMWAIT/UMONITOR/TPAUSE
* Direct L2->L0 TLB flushing when L0 is Hyper-V and L1 is KVM
* Tell Windows guests if SMT is disabled on the host
* More accurate detection of vmexit cost
* Revert a pvqspinlock pessimization
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