libxl: implement virDomainGetJobStats

Introduces support for domainGetJobStats which has the same
info as domainGetJobInfo but in a slightly different format.
Another difference is that virDomainGetJobStats can also
retrieve info on the most recently completed job. Though so
far this is only used in the source node to know if the
migration has been completed. But because we don't support
completed jobs we will deliver an error.
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

src/libxl/libxl_driver.c

@@ -4877,6 +4877,57 @@ libxlDomainGetJobInfo(virDomainPtr dom,
     return ret;
 }
 
+static int
+libxlDomainGetJobStats(virDomainPtr dom,
+                       int *type,
+                       virTypedParameterPtr *params,
+                       int *nparams,
+                       unsigned int flags)
+{
+    libxlDomainObjPrivatePtr priv;
+    virDomainObjPtr vm;
+    virDomainJobInfoPtr jobInfo;
+    int ret = -1;
+    int maxparams = 0;
+
+    /* VIR_DOMAIN_JOB_STATS_COMPLETED not supported yet */
+    virCheckFlags(0, -1);
+
+    if (!(vm = libxlDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virDomainGetJobStatsEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    priv = vm->privateData;
+    jobInfo = priv->job.current;
+    if (!priv->job.active) {
+        *type = VIR_DOMAIN_JOB_NONE;
+        *params = NULL;
+        *nparams = 0;
+        ret = 0;
+        goto cleanup;
+    }
+
+    /* In libxl we don't have an estimated completion time
+     * thus we always set to unbounded and update time
+     * for the active job. */
+    if (libxlDomainJobUpdateTime(&priv->job) < 0)
+        goto cleanup;
+
+    if (virTypedParamsAddULLong(params, nparams, &maxparams,
+                                VIR_DOMAIN_JOB_TIME_ELAPSED,
+                                jobInfo->timeElapsed) < 0)
+        goto cleanup;
+
+    *type = jobInfo->type;
+    ret = 0;
+
+ cleanup:
+    if (vm)
+        virObjectUnlock(vm);
+    return ret;
+}
 
 static int
 libxlConnectDomainEventRegisterAny(virConnectPtr conn, virDomainPtr dom, int eventID,
@@ -5472,6 +5523,7 @@ static virHypervisorDriver libxlHypervisorDriver = {
     .nodeGetFreeMemory = libxlNodeGetFreeMemory, /* 0.9.0 */
     .nodeGetCellsFreeMemory = libxlNodeGetCellsFreeMemory, /* 1.1.1 */
     .domainGetJobInfo = libxlDomainGetJobInfo, /* 1.3.1 */
+    .domainGetJobStats = libxlDomainGetJobStats, /* 1.3.1 */
     .domainMemoryStats = libxlDomainMemoryStats, /* 1.3.0 */
     .domainGetCPUStats = libxlDomainGetCPUStats, /* 1.3.0 */
     .connectDomainEventRegister = libxlConnectDomainEventRegister, /* 0.9.0 */