ch: Handle resize events

When resize events are found in the monitor, try to update the thread
id mapping (if a change is detected the domain.xml will also be
updated).

On vm resizes removing vcpus, the event will be triggered but because
cloud-hypervisor does not kill the associated thread right away, the
thread of the removed vcpu is going to still be detected and so
validating the event was processed successfully is skipped for now.

src/ch/ch_monitor.c

@@ -771,7 +771,20 @@ static int virCHMonitorProcessEvent(virCHMonitorPtr mon,
         case virCHMonitorVmEventSnapshotted:
         case virCHMonitorVmEventRestoring:
         case virCHMonitorVmEventResizing:
+            break;
         case virCHMonitorVmEventResized:
+            virObjectLock(vm);
+            if (virDomainObjIsActive(vm) &&
+                   virCHDomainObjBeginJob(vm, CH_JOB_MODIFY) == 0) {
+                virCHProcessSetupThreads(vm);
+                /* currently cloud hypervisor lazy offlines cpus so
+                 * the offline cpus may still have an active thread id
+                 * making virCHDomainValidateVcpuInfo fail. For now
+                 * don't validate the result of resizing. */
+                virCHDomainObjEndJob(vm);
+            }
+            virObjectUnlock(vm);
+            break;
         case virCHMonitorVmEventDeleted:
         case virCHMonitorVmmEventStarting:
         case virCHMonitorCpuCreateVcpu:

src/ch/ch_process.c

@@ -503,6 +503,8 @@ virCHProcessSetupVcpus(virDomainObjPtr vm)
 
 int virCHProcessSetupThreads(virDomainObjPtr vm)
 {
+    virCHDriverPtr driver = CH_DOMAIN_PRIVATE(vm)->driver;
+    g_autoptr(virCHDriverConfig) cfg = virCHDriverGetConfig(driver);
     virCHDomainObjPrivatePtr priv = vm->privateData;
     int ret;
 
@@ -523,6 +525,10 @@ int virCHProcessSetupThreads(virDomainObjPtr vm)
         ret = virCHProcessSetupVcpus(vm);
     }
 
+    if (!ret) {
+        ret = virDomainObjSave(vm, driver->xmlopt, cfg->stateDir);
+    }
+
     return ret;
 }