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STATUS_HV_NOT_ALLOWED_WITH_NESTED_VIRT_ACTIVE
The requested operation conflicts with an active nested-virtualization mode
STATUS_HV_NOT_ALLOWED_WITH_NESTED_VIRT_ACTIVE means the hypervisor recognized the requested operation but refuses to perform it while nested virtualization is active. Nested mode changes which hypervisor layer owns virtualization controls and which features can be safely exposed to the guest.
This status is a policy and safety boundary, not a transient communication failure. Retrying the same operation without changing the nested-virtualization state is unlikely to help.
What to inspect
- Whether the target VM exposes virtualization extensions to its guest.
- The operation being attempted: CPU topology change, VTL/security setting, memory mapping, device assignment, or partition configuration.
- Which layer is the physical Hyper-V host and which layer is the nested host.
- Whether the operation is valid only before enabling nested virtualization or only while the partition is stopped.
Useful distinction
This differs from STATUS_HV_FEATURE_UNAVAILABLE. A feature can be unavailable because it was never exposed; here Hyper-V is saying the operation is not allowed specifically because nested virtualization is active.
References
- Microsoft: Windows Hypervisor Platform API
- Microsoft: Hyper-V architecture
- Microsoft: Hyper-V TLFS
- Linux kernel documentation: Hyper-V overview
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