Config file where "nokvm" variants are all skipped

failing config file

variants:
    - unknown_qemu:
    - rhel64:
    - qemu13:
only unknown_qemu
variants:
    - cpu.unset:
    - cpu.set:
        variants:
            - 486:
            - core2duo:
    - cpu.amd:
        variants:
            - qemu64:
            - phenom:
variants:
    - kvm:
    - nokvm:
        enable_kvm = "no"
        disable_kvm = "yes"
variants:
    # CPUID data tests:
    - cpuid:
        # 486 is excluded due to not supporting cpuid
        no 486
        variants:
            - default_vendor:
                test_type = "default_vendor"
                kvm:
                    vendor = "host"
                    # instead of running one test case per CPU model,
                    # run only one test that checks every single model,
                    # even the ones not listed in the "cpu.*" variants above
                    only cpu.unset
                    cpu_models = "*"
                nokvm:
                    # we don't know if all models will be available if QEMU
                    # version is unknown:
                    no unknown_qemu
                    only cpu.intel cpu.amd
                    cpu.intel:
                            vendor = "GenuineIntel"
                    cpu.amd:
                            vendor = "AuthenticAMD"
            - custom:
                # the checks below will be run without setting the CPU model
                # explicitly. they can be repeated for each known CPU model
                # if removing the following line:
                only cpu.unset
                variants:
                    - vendor:
                        test_type = "custom_vendor"
                        variants:
                            - normal:
                                vendor = "QWERasdfZXCV"