vGPU instance fail to spawn with error "libvirt.libvirtError: internal error: Process exited prior to exec: libvirt: error : failed to access '/sys/bus/mdev/devices/<ID>/iommu_group"

Issue

• vGPU instance fail to spawn with error "libvirt.libvirtError: internal error: Process exited prior to exec: libvirt: error : failed to access '/sys/bus/mdev/devices//iommu_group"
  • vGPU instance fail to spawn with below error in nova-compute.log

2020-09-07 09:05:55.107 7 ERROR nova.compute.manager [instance: c33b8c4e-514e-4c13-b1a8-4b79c9464551] libvirt.libvirtError: internal error: Process exited prior to exec: libvirt:  error : failed to access '/sys/bus/mdev/devices/b6ce4eb8-a8cb-423a-abfe-8ed8becdd4a9/iommu_group': No such file or directory