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ERROR_HV_UNKNOWN_PROPERTY
Headers can know a partition property that the running hypervisor does not
ERROR_HV_UNKNOWN_PROPERTY means the property selector itself is not recognized by the active Hyper-V implementation. This is distinct from a recognized property carrying an invalid value. Newer SDK headers and management software can expose property codes that are absent on an older host or unavailable for the current architecture.
Record the numeric HV_PARTITION_PROPERTY_CODE, host build, architecture, and whether the request used the fixed-size or extended property hypercall. Query feature and interface discovery data before setting optional properties. Falling back should be property-specific; replacing an unknown security or processor property with zero can silently change the VM contract.
Compatibility data to capture
- Numeric property code and expected payload format.
- Host hypervisor version, architecture, and reported capabilities.
- Whether the same property is readable, writable, early-only, or unsupported.
- Fallback behavior chosen by the management layer.
References
- Microsoft TLFS: partition property selectors
- Microsoft TLFS: reading partition properties
- Microsoft TLFS: runtime feature discovery
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