What does NTSTATUS 0xC0350002 (STATUS_HV_INVALID_HYPERCALL_CODE) mean?

STATUS_HV_INVALID_HYPERCALL_CODE

The call code is outside the guest-visible Hyper-V interface

STATUS_HV_INVALID_HYPERCALL_CODE means the hypervisor rejected the requested hypercall number before it performed the requested operation. It is not a failure reported by the guest workload running inside a VM. Hypercalls are the guest-to-hypervisor ABI, and the set that a partition may use depends on the interface and capabilities actually exposed by its hypervisor.

Do not treat a host version string or vendor label as proof that a hypercall is available. The Hyper-V TLFS says software should discover the interface and features exposed to the partition, then select a supported path. A nested VM can expose a smaller interface than a direct Hyper-V guest even when the outer host supports more functionality.

What to capture

• The hypercall code, control word, architecture and whether the call is simple, rep, or fast.
• The HV#1 interface result and the feature/privilege data visible to the calling partition.
• Whether the VM is running nested and which layer owns the rejected call.
• The feature-detection branch that selected the hypercall instead of a fallback API.

References

• Microsoft: Hyper-V hypercall interface
• Microsoft: Hyper-V feature and interface discovery
• Linux source: Hyper-V guest initialization

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