Github user serg38 commented on the issue:
https://github.com/apache/cloudstack/pull/1767
@koushik-das @ustcweizhou Just want to add on the use case. There is
growing need to change template/VM details for after the deployment e.g. to
switch root disk controller or change ratio of cores/socket with
cpuid.coresPerSocket or with adding vGPU startup parameters or switch boot
firmware from bios to efi as required by some OS. Currently users are unable to
easily do it with API and/or UI. As implemented now, all settings with
display=1 in user_vm_details and vm_template_details will be returned by API
and allowed to changed. If desired we can open another PR to switch details
created by other API in automatic fashion to have display=0 so they will not
show up in the response of these APIs and users wont be able to edit/delete
them. We thought this to be out of scope for now.
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