matheusfontes commented on issue #5204:
URL: https://github.com/apache/cloudstack/issues/5204#issuecomment-888318981


   > @AlexanderKgr @matheusfontes did you notice any change in the OS version 
of the VM in XCP-ng center/CLI before and after starting (failed with uefi) the 
VM?
   
   We were using cloudstack 4.14 with xcp 7.6. We upgraded to 4.15.1 to install 
new cluster of xcp 8.2
   Everything works perfect but when I try to migrate a windows vm on version 
2016, 2019 or windows 10 from old cluster xcp 7.6 to 8.2 cludstack create vm as 
uefi boot.
   On citrix documentation 
(https://docs.citrix.com/en-us/citrix-hypervisor/vms/windows.html) there is a 
SO boot matrix compatibility and apparently this windows versions are using by 
default uefi boot.
   I think cloudstack 4.15.1 need to set this old vms as BIOS boot unless the 
vms was specifically set to boot as uefi.
   This applies to secure boot also. But secure boot now is not a problem 
because it isn't set enable by default.
   
    xe vm-param-set uuid=<UUID> HVM-boot-params:firmware=<MODE> (where MODE is 
BIOS OR UEFI)
    xe vm-param-set uuid=<UUID> platform:secureboot=<OPTION> (where OPTION is 
true or false)


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