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ERROR_VID_EXCEEDED_MBP_ENTRY_MAP_LIMIT
ERROR_VID_EXCEEDED_MBP_ENTRY_MAP_LIMIT is HRESULT 0xC037000C in the VID memory-block-page map accounting area of the Windows virtualization stack. The built-in message names the immediate result; the useful custom context is the exact boundary: the number of mapped VID memory-block-page entries tracked for a partition or host context. Record the first returning operation and host-side event before a management layer retries or translates it.
Why this HRESULT is specific
The requested mapping would exceed an internal page-entry map limit. Count active mappings and their lifetime; host free RAM alone does not explain this accounting bound.
Hyper-V architecture documentation identifies VID as the component that provides partition, virtual-processor, and memory-management services., many ERROR_VID_* values describe internal host objects rather than a public API that administrators should call directly. Accordingly, diagnose this result through the named object/state, the VMMS or Worker event chain, and the operation that produced it; do not invent a user-mode VID call from the constant name.
Neighboring result: MBP_COUNT_EXCEEDED_LIMIT applies while creating a memory block with too many pages; ENTRY_MAP_LIMIT concerns mapping entries accumulated or requested later.
Records worth collecting
| Evidence | Why it changes the diagnosis |
|---|---|
| Memory block and range | Record handle, GPA start, page count, access flags, and mapping owner. |
| Active map inventory | Count mapped entries by partition and generation. |
| Unmap symmetry | Compare successful maps with unmaps, including error rollback. |
| Scale boundary | Capture the last successful and first failing map count. |
Preserve identifiers and counts without dumping guest secrets or unrelated memory. Useful this result timestamps include the last successful operation, first failure, any automatic retry, and the object-generation change that followed.
A reproducible test plan
- Coalesce adjacent mappings where the API and access semantics permit.
- Unmap on every teardown and partial-failure path.
- Reuse stable mappings instead of repeatedly mapping the same pages.
- Stress map/unmap cycles and watch the active count return to baseline.
Use a controlled partition or disposable VM when a mapping, lock, or teardown test can be destructive. During the result run, keep page units, GPA boundaries, parent object, handle generation, and release order visible.
Comparison matrix
Across these controls for it, preserve the number of mapped VID memory-block-page entries tracked for a partition or host context as the boundary under test.
| Control | Interpretation | Hold constant |
|---|---|---|
| Smaller exact range — this result | Reduce only page count or mapped extent. If this result moves, range arithmetic, object limits, or reserve capacity is involved. | Keep the same block, GPA base, flags, and partition generation for it. |
| Balanced fresh lifecycle — it | Create, use, release, and destroy one object generation. A different it exposes leaked references, locks, handles, or mappings. | Preserve sizes and operation order while changing only generation. |
| Same request under lower host pressure — it | If it changes after controlled pressure is removed, quantify host/pool capacity; if not, focus on caller bookkeeping. | Do not modify guest disks or unrelated VM devices during the result comparison. |
Misleading shortcuts
Restarting can release the exact lock, reference, mapping, or opaque handle behind it without fixing the lifecycle defect. Before recovering from it, preserve the object graph and acquire/release counts.
Verification after repair
The original workload remains below the understood limit with no growth across repeated lifecycle cycles. Repeat the original operation under the original supported conditions and retain one deliberate negative control. A management command succeeding on a different object is not sufficient to close this incident.
Technical references
These sources define it and the public Hyper-V architecture surrounding the internal state. They do not create a public user-mode VID API for the named object.
- Microsoft Open Specifications: HRESULT values — used to interpret the boundary.
- Microsoft: WHvMapGpaRange — used to interpret the boundary.
- Microsoft: WHP memory data types — used to interpret the boundary.
- Microsoft: Hyper-V architecture — used to interpret the boundary.
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