Re: [pve-devel] partially-applied: [PATCH v4 qemu-server 00/16] rework memory hotplug + virtiomem

[Fiona Ebner <f.ebner@proxmox.com>]

Am 27.02.23 um 15:04 schrieb Thomas Lamprecht:
> Am 16/02/2023 um 13:35 schrieb Fiona Ebner:
>> Add a get_derived_property() method to AbstractConfig.pm, taking a
>> (partial) config and the name for the derived property. The first two
>> will be 'maxcpu' and 'maxmem' (should I use 'max-cpu' or different
>> names?), because that's what HA manager needs.
> 
> Yeah, would prefer having *some* sort of casing, as none is IMO needlessly
> hard to read. kebab-case would work fine for me.
> 

Okay!

> 
>>
>> The partial config needs to contain all actual properties needed to
>> compute the derived property, e.g. 'vcpus', 'sockets' and 'cores' for
>> 'maxcpu' in case of VMs.
>>
>> If we switch to get_guest_config_properties(), there needs to be a
> 
> do you mean `get_derived_property` here?

Sorry, should've been clearer. I mean
PVE::Cluster::get_guest_config_properties() where it's only possible to
query specific properties, hence the need for the second method.

> 
>> second method to request which properties are actually needed for the
>> computation of the derived property beforehand.
> 
> I.e., something like a `get_derived_property_inputs` sub?
> 

Yes.

>>
>> Whenever something in the actual properties changes, the calculation
>> needs to be adapted to still yield the same result for the derived
>> property, but this can be done entirely in the VM/CT plugin implementation.
>>
>> Whenever HA manager needs something new, a new derived property is
>> implemented in the plugins and dependency bumps for
>> qemu-server/pve-container are done.
> 
> It has some complexity, but I don't have a really better idea, so fine
> by me.