Re: [libvirt] [PATCH] qemu-capabilities: Fix query-cpu-model-expansion on s390 with older kernel

When running on s390 with a kernel that does not support cpu model checking and with a Qemu new enough to support query-cpu-model-expansion, the gathering of qemu capabilities will fail. Qemu responds to the query-cpu-model-expansion qmp command with an error because the needed kernel ioct does not exist. When this happens a guest cannot even be defined due to missing qemu capabilities data. This patch fixes the problem by silently ignoring generic errors stemming from calls to query-cpu-model-expansion. Reported-by: Farhan Ali <alifm(a)linux.vnet.ibm.com&gt; Signed-off-by: Collin L. Walling <walling(a)linux.vnet.ibm.com&gt; Signed-off-by: Jason J. Herne <jjherne(a)linux.vnet.ibm.com&gt; --- src/qemu/qemu_monitor_json.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index e767437..1662749 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -5041,6 +5041,15 @@ qemuMonitorJSONGetCPUModelExpansion(qemuMonitorPtr mon, if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0) goto cleanup; + /* Some QEMU architectures have the query-cpu-model-expansion + * command, but return 'GenericError' instead of simply omitting + * the command entirely. + */

+ if (qemuMonitorJSONHasError(reply, "GenericError")) { + ret = 0; + goto cleanup; + } + if (qemuMonitorJSONCheckError(cmd, reply) < 0) goto cleanup;