Enabled nested virtualisation on Hyper-V

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To be able to run other hypervisor on existing Hyper-V host, such as Proxmox

Set-VMProcessor <vm name> -ExposeVirtualizationExtensions $true

PS C:\Windows\system32> Set-VMProcessor PRX1-V -ExposeVirtualizationExtensions $true
PS C:\Windows\system32> Get-VMProcessor PRX1-V | select *


VMCheckpointId                               : 00000000-0000-0000-0000-000000000000
VMCheckpointName                             :
ResourcePoolName                             : Primordial
Count                                        : 8
CompatibilityForMigrationEnabled             : True
CompatibilityForOlderOperatingSystemsEnabled : False
HwThreadCountPerCore                         : 1
ExposeVirtualizationExtensions               : True
Maximum                                      : 100
Reserve                                      : 0
RelativeWeight                               : 100
MaximumCountPerNumaNode                      : 4
MaximumCountPerNumaSocket                    : 1
EnableHostResourceProtection                 : False
OperationalStatus                            : {}
StatusDescription                            : {}
Name                                         : Processor
Id                                           : Microsoft:1F1B6522-820D-4511-B119-BA1B52349426\b637f346-6a0e-4dec-af52-b
                                               d70cb80a21d\0
VMId                                         : 1f1b6522-820d-4511-b119-ba1b52349426
VMName                                       : PRX1-V
VMSnapshotId                                 : 00000000-0000-0000-0000-000000000000
VMSnapshotName                               :
CimSession                                   : CimSession: .
ComputerName                                 : HYP1
IsDeleted                                    : False

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