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Description of problem: After revert to an snapshot, the VM can't boot, because the CPU configuration is invalid. Version-Release number of selected component (if applicable): libvirt-client-3.2.0-14 How reproducible: Every time Steps to Reproduce: 1. shut down vm 2. make an snapshot via "sudo virsh snapshot-create-as foo bar" 3. start the vm 4. shut down the vm 5. revert to the snapshot via "sudo virsh snapshot-revert foo bar" 6. try to start the vm Actual results: Start fails with: error: Failed to start domain foo error: unsupported configuration: host doesn't support invariant TSC Expected results: running vm Additional info: Workaround: sudo virsh edit foo change: <cpu mode='custom' match='exact' check='partial'> <model fallback='allow'>Haswell-noTSX</model> <vendor>Intel</vendor> <feature policy='require' name='vme'/> <feature policy='require' name='ds'/> <feature policy='require' name='acpi'/> <feature policy='require' name='ss'/> <feature policy='require' name='ht'/> <feature policy='require' name='tm'/> <feature policy='require' name='pbe'/> <feature policy='require' name='dtes64'/> <feature policy='require' name='monitor'/> <feature policy='require' name='ds_cpl'/> <feature policy='require' name='vmx'/> <feature policy='require' name='est'/> <feature policy='require' name='tm2'/> <feature policy='require' name='xtpr'/> <feature policy='require' name='pdcm'/> <feature policy='require' name='osxsave'/> <feature policy='require' name='f16c'/> <feature policy='require' name='rdrand'/> <feature policy='require' name='arat'/> <feature policy='require' name='tsc_adjust'/> <feature policy='require' name='xsaveopt'/> <feature policy='require' name='pdpe1gb'/> <feature policy='require' name='abm'/> <feature policy='require' name='invtsc'/> </cpu> to: <cpu mode='host-model' check='partial'> <model fallback='allow'/> </cpu>