qemu: process: Copy final vcpu order information into the vcpu definition

The vcpu order information is extracted only for hotpluggable entities,
while vcpu definitions belonging to the same hotpluggable entity need
to all share the order information.

We also can't overwrite it right away in the vcpu info detection code as
the order is necessary to add the hotpluggable vcpus enabled on boot in
the correct order.

The helper will store the order information in places where we are
certain that it's necessary.

src/qemu/qemu_domain.c

@@ -5999,3 +5999,37 @@ qemuDomainVcpuHotplugIsInOrder(virDomainDefPtr def)
 
     return seenonlinevcpus == virDomainDefGetVcpus(def);
 }
+
+
+/**
+ * qemuDomainVcpuPersistOrder:
+ * @def: domain definition
+ *
+ * Saves the order of vcpus detected from qemu to the domain definition.
+ * The private data note the order only for the entry describing the
+ * hotpluggable entity. This function copies the order into the definition part
+ * of all sub entities.
+ */
+void
+qemuDomainVcpuPersistOrder(virDomainDefPtr def)
+{
+    size_t maxvcpus = virDomainDefGetVcpusMax(def);
+    virDomainVcpuDefPtr vcpu;
+    qemuDomainVcpuPrivatePtr vcpupriv;
+    unsigned int prevorder = 0;
+    size_t i;
+
+    for (i = 0; i < maxvcpus; i++) {
+        vcpu = virDomainDefGetVcpu(def, i);
+        vcpupriv = QEMU_DOMAIN_VCPU_PRIVATE(vcpu);
+
+        if (!vcpu->online) {
+            vcpu->order = 0;
+        } else {
+            if (vcpupriv->enable_id != 0)
+                prevorder = vcpupriv->enable_id;
+
+            vcpu->order = prevorder;
+        }
+    }
+}

src/qemu/qemu_domain.h

@@ -725,4 +725,7 @@ int qemuDomainPrepareChannel(virDomainChrDefPtr chr,
 bool qemuDomainVcpuHotplugIsInOrder(virDomainDefPtr def)
     ATTRIBUTE_NONNULL(1);
 
+void qemuDomainVcpuPersistOrder(virDomainDefPtr def)
+    ATTRIBUTE_NONNULL(1);
+
 #endif /* __QEMU_DOMAIN_H__ */

src/qemu/qemu_process.c

@@ -5243,6 +5243,8 @@ qemuProcessLaunch(virConnectPtr conn,
     if (qemuDomainValidateVcpuInfo(vm) < 0)
         goto cleanup;
 
+    qemuDomainVcpuPersistOrder(vm->def);
+
     VIR_DEBUG("Detecting IOThread PIDs");
     if (qemuProcessDetectIOThreadPIDs(driver, vm, asyncJob) < 0)
         goto cleanup;