On 7/24/19 12:18 PM, Boris Fiuczynski wrote:
On 7/17/19 4:03 PM, Collin Walling wrote:
[...]
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index b599ee6..3c33c63 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -5875,6 +5875,101 @@
qemuMonitorJSONGetCPUModelBaseline(qemuMonitorPtr mon,
}
+static int
+qemuMonitorJSONParseCPUModelPropName(size_t pos ATTRIBUTE_UNUSED,
+ virJSONValuePtr item,
+ void *opaque)
+{
+ if
(!qemuMonitorJSONParseCPUModelProperty(virJSONValueGetString(item),
+ item, opaque))
This need to be changed into
if (qemuMonitorJSONParseCPUModelProperty(virJSONValueGetString(item),
item, opaque) < 0)
Yes, thank you for catching this one.
+ return -1;
+
+ virJSONValueFree(item);
+ return 0;
+}
+
+
+int
+qemuMonitorJSONGetCPUModelComparison(qemuMonitorPtr mon,
+ const char *model_a_name,
+ int model_a_nprops,
+ virCPUFeatureDefPtr model_a_props,
+ const char *model_b_name,
+ int model_b_nprops,
+ virCPUFeatureDefPtr model_b_props,
+ qemuMonitorCPUModelInfoPtr
*model_result)
+{
+ int ret = -1;
+ virJSONValuePtr model_a;
+ virJSONValuePtr model_b = NULL;
+ virJSONValuePtr cmd = NULL;
+ virJSONValuePtr reply = NULL;
+ virJSONValuePtr data;
+ const char *result_name;
+ virJSONValuePtr props;
+ qemuMonitorCPUModelInfoPtr compare = NULL;
+
+ if (!(model_a = qemuMonitorJSONMakeCPUModel(model_a_name,
model_a_nprops,
+ model_a_props, true)) ||
+ !(model_b = qemuMonitorJSONMakeCPUModel(model_b_name,
model_b_nprops,
+ model_b_props, true)))
+ goto cleanup;
+
+ if (!(cmd = qemuMonitorJSONMakeCommand("query-cpu-model-comparison",
+ "a:modela", &model_a,
+ "a:modelb", &model_b,
+ NULL)))
+ goto cleanup;
+
+ if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
+ goto cleanup;
+
+ if (qemuMonitorJSONCheckError(cmd, reply) < 0)
Did you test scenarios which contain unknown cpu model name or unknown
features?
This caused errors for me during testing that resulted in e.g.
error : qemuMonitorJSONCheckError:415 : internal error: unable to
execute QEMU command 'query-cpu-model-comparison': Property '.boris' not
found
warning : virQEMUCapsLogProbeFailure:4586 : Failed to probe
capabilities for /usr/bin/qemu-system-s390x: internal error: unable to
execute QEMU command 'query-cpu-model-comparison': Property '.boris' not
found
If I think about a scenario like: I run "virsh domcapabilties" on a new
machine with new cpu model and new cpu features, new libvirt, new qemu
and use "virsh hypervisor-cpu-compare" with the output xml on my old
machine with old cpu &feature, older libvirt and older qemu
I would expect to get as an answer: Incompatible
If my expectation to get incompatible is wrong please correct me but an
"internal error" is not what should occur.
What is the qemu specification for this?
Two routes:
1) Fix up the logic in virQEMUCapsCPUModelComparison
Please see my comments on patch 8.
2) Change the error class in the QEMU QMP code
The QMP code in QEMU currently reports a "GenericError" whenever
something goes wrong (such as an unknown CPU model or feature). A
possible solution to this would be to alter that code to set a specific
error class, have libvirt check for that specific error type in the
JSON, then handle it appropriately to print a cleaner message.
There is one drawback: we would technically be reporting this error
twice -- once in virsh, and another in the libvirt daemon (the internal
error) unless we wanted to suppress it.
This is one solution without too much messy code.
+ goto cleanup;
+
+ data = virJSONValueObjectGetObject(reply, "return");
+
+ if (!(result_name = virJSONValueObjectGetString(data, "result"))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("query-cpu-model-comparison reply data was
missing "
+ "'result'"));
+ goto cleanup;
+ }
+
+ if (!(props = virJSONValueObjectGetArray(data,
"responsible-properties"))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("query-cpu-model-comparison reply data was
missing "
+ "'responsible-properties'"));
+ goto cleanup;
+ }
+
+ if (VIR_ALLOC(compare) < 0)
+ goto cleanup;
+
+ if (VIR_STRDUP(compare->name, result_name) < 0)
+ goto cleanup;
+
+ if (VIR_ALLOC_N(compare->props, virJSONValueArraySize(props)) < 0)
+ goto cleanup;
+
+ if (virJSONValueArrayForeachSteal(props,
+
qemuMonitorJSONParseCPUModelPropName,
+ compare) < 0)
+ goto cleanup;
+
+ VIR_STEAL_PTR(*model_result, compare);
+ ret = 0;
+
+ cleanup:
+ qemuMonitorCPUModelInfoFree(compare);
+ virJSONValueFree(cmd);
+ virJSONValueFree(reply);
+ virJSONValueFree(model_a);
+ virJSONValueFree(model_b);
+ return ret;
+}
+
+
[...]
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