When calling the query-cpu-model-expansion command via libvirt, we pass in model name "max" when using TCG. However, this model name is not supported for s390 on TCG. Let's use the model name "qemu" as an alternative. QEMU Results: When executing query-cpu-model-expansion via QEMU on s390 with TCG, the name "max" results in this error: { "execute": "query-cpu-model-expansion", "arguments": {"type": "static", "model": {"name": "max"}}} -> {"error": {"class": "GenericError", "desc": "The CPU definition 'max' is unknown."}} An alternative is to use model name "qemu." On a z13.2 machine: { "execute": "query-cpu-model-expansion", "arguments": {"type": "static", "model": {"name": "qemu"}}} -> {"return": {"model": {"name": "zEC12.2-base", "props": {"dateh2": false, "aen": true, "kmac-tdea-192": false, "kmc-tdea-192": false, "parseh": false, "csske": false, "hfpm": false, "hfpue": false, "dfp": false, "km-dea": false, "emon": false, "kimd-sha-1": false, "cmpsceh": false, "dfpzc": false, "dfphp": false, "kmc-dea": false, "klmd-sha-1": false, "asnlxr": false, "km-tdea-192": false, "km-tdea-128": false, "fpe": false, "kmac-dea": false, "kmc-tdea-128": false, "ais": true, "kmac-tdea-128": false, "nonqks": false, "pfpo": false, "msa4-base": true, "msa3-base": true, "tods": false}}}} I am by all means *not* an expert in TCG, but I noticed this error while I was messing around with things on my system. Thanks! Collin Walling (1): qemu: caps: use model "qemu" for s390 tcg cpu-model-expansion src/qemu/qemu_capabilities.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) -- 2.7.4 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list