Techniques for concurrently supporting virtual NUMA and CPU/memory hot-add in a virtual machine

A non-transitory computer readable storage medium having stored thereon instructions executable by a hypervisor of a host system, the instructions embodying a method comprising:

• computing a node size for a virtual non-uniform memory access (NUMA) topology of a virtual machine (VM), the node size indicating a maximum number of virtual central processing units (vCPUs) and a maximum amount of memory to be included in each node of the virtual NUMA topology;
• building the virtual NUMA topology based on the computed node size and a configuration of the VM;
• exposing the virtual NUMA topology to the VM;
• and
• at a time of receiving a request to hot-add a new vCPU or a new memory region to the VM:
• if all existing nodes in the virtual NUMA topology have reached the maximum number of vCPUs or the maximum amount of memory, creating a new node with the new vCPU or the new memory region and adding the new node to the virtual NUMA topology.

A host system comprising:

• a processor;
• and
• a non-transitory computer readable medium having stored thereon program code that, when executed by the processor, causes the processor to:
• compute a node size for a virtual non-uniform memory access (NUMA) topology of a virtual machine (VM), the node size indicating a maximum number of virtual central processing units (vCPUs) and a maximum amount of memory to be included in each node of the virtual NUMA topology;
• build the virtual NUMA topology based on the computed node size and a configuration of the VM;
• expose the virtual NUMA topology to the VM;
• and
• at a time of receiving a request to hot-add a new vCPU or a new memory region to the VM:
• if all existing nodes in the virtual NUMA topology have reached the maximum number of vCPUs or the maximum amount of memory, create a new node with the new vCPU or the new memory region and add the new node to the virtual NUMA topology.