Created attachment 1376987 [details] nova log with domain xml Description of problem: Nova (OpenStack component) defaults to cpu_mode = host-model on all architectures. And then all VM instances fail: "Failed to start libvirt guest: libvirtError: unsupported configuration: CPU mode 'host-model' for aarch64 kvm domain on aarch64 host is not supported by hypervisor." Popular workaround is to use 'host-passthrough' but that breaks live migration on cloud setups with different ARMv8a cpu cores. Version-Release number of selected component (if applicable): 3.10.0 How reproducible: always Steps to Reproduce: 1. Deploy Nova compute component 2. Run VM instance Actual results: "Failed to start libvirt guest: libvirtError: unsupported configuration: CPU mode 'host-model' for aarch64 kvm domain on aarch64 host is not supported by hypervisor." Expected results: Instance runs. Additional info:
After some reading I tried 'cpu_mode=custom' + 'cpu_model=cortex-a53' but such setup broke Nova. CPU snippet from domain definition was: <cpu mode='custom' match='exact' check='partial'> <model fallback='allow'>cortex-a53</model> <topology sockets='1' cores='1' threads='1'/> </cpu>