private/Tests/Test-IsVM.ps1
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function Test-IsVM { <# .SYNOPSIS Returns $true when the operating system is running inside any hypervisor (Hyper-V guest, VMware, VirtualBox, or QEMU/KVM). .DESCRIPTION Queries Win32_ComputerSystem and Win32_BIOS via CIM to detect the most common hypervisor platforms. Returns $false on bare-metal or when CIM data is unavailable. Used to prevent enabling Hyper-V when the host OS is itself a virtual machine (nested virtualisation is not universally supported). .NOTES Author: David Segura Company: Recast Software Hypervisors detected: - Microsoft Hyper-V guest (Manufacturer: 'Microsoft Corporation', Model: 'Virtual Machine') - VMware (Manufacturer: 'VMware*') - Oracle VirtualBox (Manufacturer: 'innotek GmbH' | Model: 'VirtualBox') - QEMU / KVM (Manufacturer: 'QEMU*' | BIOS: 'BOCHS' | BIOS: 'QEMU') - BIOS version strings ('VRTUAL', 'VMWARE', 'VBOX') Dependencies: None #> [OutputType([bool])] param () $cs = Get-CimInstance -ClassName Win32_ComputerSystem -ErrorAction SilentlyContinue $bios = Get-CimInstance -ClassName Win32_BIOS -ErrorAction SilentlyContinue if (-not $cs) { return $false } # Hyper-V guest if ($cs.Manufacturer -eq 'Microsoft Corporation' -and $cs.Model -eq 'Virtual Machine') { return $true } # VMware if ($cs.Manufacturer -like 'VMware*') { return $true } # Oracle VirtualBox if ($cs.Manufacturer -eq 'innotek GmbH' -or $cs.Model -eq 'VirtualBox') { return $true } # QEMU / KVM if ($cs.Manufacturer -like 'QEMU*') { return $true } # BIOS version strings (covers edge cases and some cloud VMs) if ($bios) { $biosVersion = [string]$bios.SMBIOSBIOSVersion foreach ($marker in @('VRTUAL', 'VMWARE', 'VBOX', 'BOCHS', 'QEMU')) { if ($biosVersion -like "*$marker*") { return $true } } } return $false } |