sap_vm_hypervisor_node_preconfigure/kubevirt_vm: Make amount of reserved hugepages configurable

[newkit]

Additional to the current estimation on how many hugepages are reserved on the worker nodes, introduce a variable that allows the user to specify the number of HPs.

[marcelmamula]

@newkit Even if this is some kind of internal note for work you will do, then it still needs more information than just one sentence.

Please consider how you create these kind of issues in future as this is not productive. @rhmk

[newkit]

To give some more background on what this feature is about. Performance of guests is improved when organizing the memory of a VM in 1GB hugepages (HPs). The amount of memory to be organized in HPs is determined here .

There is a way to overwrite the minimal required memory amount check sap_hypervisor_node_preconfigure_ignore_minimal_memory_check. When doing so, the calculation cited above can fail.

It is desirable to have the possibility to define an amount of HPs that should be reserved, e.g.

sap_hypervisor_node_preconfigure_amount_1G_hugepages: 64

This should lead to a check if this amount of memory plus overhead is available and if so, continue and reserve this amount as HPs.