Merge pull request #102643 from openshift-cherrypick-robot/cherry-pick-95585-to-enterprise-4.21

[enterprise-4.21] #CNV -62298 -  CPU hotplug with networkInterfaceMultiqueue enabled

Author: ousleyp

modules/virt-hot-plugging-cpu.adoc

@@ -24,3 +24,11 @@ You can hot plug up to three times the default initial number of vCPU sockets of
 +
 If the VM is migratable, a live migration is triggered. If not, or if the changes cannot be live-updated, a `RestartRequired` condition is added to the VM.
 
+[NOTE]
+====
+If a VM has the `spec.template.spec.domain.devices.networkInterfaceMultiQueue` field enabled and CPUs are hot plugged, the following behavior occurs:
+
+* Existing network interfaces that you attach before the CPU hot plug retain their original queue count, even after you add more virtual CPUs (vCPUs). The underlying virtualization technology causes this expected behavior.  
+* To update the queue count of existing interfaces to match the new vCPU configuration, you can restart the VM. A restart is only necessary if the update improves performance.  
+* New VirtIO network interfaces that you hot plugged after the CPU hotplug automatically receive a queue count that matches the updated vCPU configuration.
+====