Host resource management

[lukasfrank]

Summary

This issue tracks the addition of host resource management functionality to the libvirt-provider. This feature would enhance the capabilities of the libvirt-provider by allowing better control and allocation of host resources such as CPU, memory, NICs, SGX memory, ..., and (ephemeral) storage.

Use Case

• Assign VCPU to CPU
• Block CPUs
• Assign NUMA nodes
• Define SGX
• ...

Proposed changes

1. Extend api.Machine with needed properties eg.

type MachineSpec struct {
	...
        #e.g.
        CpuPins map[int]int 
	...
}

2. Extend the reconciler to support the new fields
3. Implement a resource management component
4. Extend IRI if needed

Example flow

graph LR
  Poollet -->|CreateMachine, Status| GRPC_Server
  GRPC_Server -->|Calls| Resource_Management
  GRPC_Server -->|Creates api.Machine| Store
  Reconciler -->|Watches| Store

Loading

Resource Manager

The GRPC Server will call the Resource Manager (RM) in order to get information about the shared resources. The response is embedded into the api.Machine and put into the Store by the Server. The RM keeps track of the resources offered by the host and the current VMs on the host. Status requests are also answered by the RM.

Features

• SGX Add SGX memory support  #157
• overcommit vcpu for scheduling #167
• reserve hugepages / memory which cannot be used vm #166
• blocked cpus for scheduling and cpu pinning #168
• Support NUMA Domain Pinning and Usage of Hugepages #48
• limit count of vms which can be created #172
• Implement a resource management component #170
• Define resource fields for api.Machine #181