TOCMS WindowsWindows 11 Draft for Information Only
ContentMicrosoft Windows 10 Nested Hyper-V
Microsoft Windows 10 Nested Hyper-VNested VirtualizationNested virtualization is a feature of running a Hyper-V inside of a Hyper-V virtual machine (VM). The nested virtualization feature of a Hyper-V virtual machine enables running other testing configurations on the same virtural machine. Nested Hyper-V Requirements
VirtualizationModern processors provide features, e.g. Intel VT-x and AMD-V for making machine virtualization more easily. Hyper-V also relies on these processor virtual extension features to run virtual machines. By design, Hyper-V always prevents other software from using these processor capabilities once Hyper-V starts. This prevents guest virtual machines from running Hyper-V. However, nested virtualization feature makes these processor capabilities also available to guest virtual machines. In other words, the virtual extension features of phyical processor is also available to the virtual processor of guest OS through the optional nested virtualization feature. Nested Virtualization OptionThe nested virtualization feature is an optional feature of a Hyper-V virtual machine. The nested virtualization feature is controlled by the ExposeVirtualizationExtensions attribute of a Hyper-V virtual machine. The nested virtualization feature must be enabled before a virtual machine is ON state. In other words, the setting of nested virtualization feature of a virtual machine can only be done while the virtual machine is stopped in the OFF state. Enable Nested Virtualization OptionSet-VMProcessor -VMName <VMName> -ExposeVirtualizationExtensions $true Disable Nested Virtualization OptionSet-VMProcessor -VMName <VMName> -ExposeVirtualizationExtensions $false Memory OptionThe nested virtualization feature itself does not affect the choice of virtual machine memory option. However, when Hyper-V is running inside a virtual machine, the dynamic memory and runtime memory resize options will be disabled because the virtual machine must be turned off to adjust its memory. In other words, the amount of memory will not fluctuate even if dynamic memory is enabled or any attempt to adjust the amount of memory while a virtual machine without dynamic memory enabled is running will fail. Networking OptionThe virtual networking for second-level virtual machines is different from first-level virtual machines. The two options are MAC address spoofing and NAT networking MAC Address SpoofingIn order for network packets to be routed through two virtual switches, MAC address spoofing must be enabled on the first level of virtual switch. e.g the PowerShell command Get-VMNetworkAdapter -VMName <VMName> | Set-VMNetworkAdapter -MacAddressSpoofing On Network Address Translation (NAT)The second option relies on network address translation (NAT). This approach is best suited for cases where MAC address spoofing is not possible, like in a public cloud environment. First, a virtual NAT switch must be created in the host virtual machine (the "middle" VM). Note that the IP addresses are just an example, and will vary across environments: New-VMSwitch -Name VmNAT -SwitchType Internal New-NetNat –Name LocalNAT –InternalIPInterfaceAddressPrefix “192.168.100.0/24” Next, assign an IP address to the net adapter: Get-NetAdapter "vEthernet (VmNat)" | New-NetIPAddress -IPAddress 192.168.100.1 -AddressFamily IPv4 -PrefixLength 24 Each nested virtual machine must have an IP address and gateway assigned to it. Note that the gateway IP must point to the NAT adapter from the previous step. You may also want to assign a DNS server: Get-NetAdapter "Ethernet" | New-NetIPAddress -IPAddress 192.168.100.2 -DefaultGateway 192.168.100.1 -AddressFamily IPv4 -PrefixLength 24 Netsh interface ip add dnsserver “Ethernet” address=<my DNS server> Reference/Source©sideway ©sideway ID: 180100035 Last Updated: 1/31/2018 Revision: 0 Latest Updated Links
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