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ERROR_HV_INVALID_LP_INDEX
LP indices describe host execution resources, not guest virtual processors
ERROR_HV_INVALID_LP_INDEX means a hypercall referenced a nonexistent logical processor in the host topology. An LP index identifies a hardware execution context managed by Hyper-V, while a VP index identifies a processor exposed inside a partition. The two namespaces can have different counts and mappings.
Refresh topology after processor-group, firmware, or host configuration changes. Record the numeric LP index, CPU group, NUMA node, and API that produced it. Code that passes a VP index into an LP-oriented operation may appear to work on small systems and fail on larger hosts or after topology changes.
Topology values to compare
- LP index and CPU group used by the failing request.
- Host logical-processor count and NUMA topology.
- Partition VP index mistakenly used as a host LP identifier.
- Topology generation before and after firmware or scheduler changes.
References
- Microsoft TLFS: VP indices inside a partition
- Microsoft: Hyper-V host processor and NUMA topology
- Microsoft: mapping hardware resources through the hypervisor
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