What does NTSTATUS 0xC0370025 (STATUS_VID_MBP_ALREADY_LOCKED_USING_RESERVED_PAGE) mean?

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Description:

Cannot lock or map the memory block page for the virtualization infrastructure driver because it has already been locked using a reserve page set page. Restarting the virtual machine may fix the problem. If the problem persists, try restarting the physical computer.

Could be also:
Constant	Type	OS
ERROR_VID_MBP_ALREADY_LOCKED_USING_RESERVED_PAGE	HRESULT	Windows

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STATUS_VID_RESERVE_PAGE_SET_TOO_SMALL	STATUS_VID_MBP_COUNT_EXCEEDED_LIMIT

STATUS_VID_MBP_ALREADY_LOCKED_USING_RESERVED_PAGE

The memory-block page is already locked through reserve pages

STATUS_VID_MBP_ALREADY_LOCKED_USING_RESERVED_PAGE indicates an overlapping or repeated lock attempt on a memory-block page that already uses reserve-page backing.

The page is already locked with reserve-page backing, so another lock or map request would overlap an established VID state. Compare the second request with the original page index and reserve-page allocation instead of treating the failure as a generic shortage of host memory.

This status helps separate “not enough reserve pages” from “the same memory-block page is already in a locked state.” The investigation should focus on duplicate or overlapping operations.

What to inspect

Check whether the same GPA page range was submitted twice.
Find whether a previous lock was expected to be released before the second request.
Look for overlapping device-assignment, migration, or save/restore operations against the same range.

References

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