OpenShift Virtualization VMs with 64 or more vCPUs fail to start, "unsupported configuration: more than 255 vCPUs require extended interrupt mode enabled on the iommu device'"

Solution Verified - Updated -

Issue

  • Virtual Machines configured with 64 or more vCPUs fail to start:
default                                            0s          Warning   SyncFailed                          virtualmachineinstance/vm-example                                       server error. command SyncVMI failed: "LibvirtError(Code=67, Domain=10, Message='unsupported configuration: more than 255 vCPUs require extended interrupt mode enabled on the iommu device')"

Environment

  • Red Hat OpenShift Container Platform 4.16
  • OpenShift Virtualization 4.16

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