KVM guest causes 100% CPU usage on system with AMD processor

Solution Verified - Updated -


A KVM guest that is itself not heavily loaded is causing nearly full CPU use in a KVM host environment that uses an AMD CPU. The issue is not reproducible when using a similar guest in a KVM host environment that uses an Intel CPU.


  • Red Hat Enterprise Linux 5.4

  • KVM virtualisation

  • AMD CPU with hardware virtualisation support (svm processor flag).
  • KVM guest with more than one virtual CPU (vCPU).

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