MI.H

The public symbol file NTKRPAMP.PDB for the original release of Windows 10 tells that the kernel is built with the MI.H header at

d:\th\minkernel\ntos\mm

and draws from it the following type definitions:

Line Number	Type
544	enum _MI_LOCK_ACQUIRE_TYPE
1038	enum _MI_SYSTEM_VA_TYPE
1327	struct _MMPFNENTRY
1473	struct _MIPFNBLINK
1592	struct _MMPFN
1602	unnamed union for u1 in _MMPFN
1648	unnamed union for u3 in _MMPFN
1658	unnamed struct for e2 in u3 in _MMPFN
1686	unnamed union for u4 in _MMPFN
2043	struct _MI_CACHED_PTE
2082	struct _MI_CACHED_PTES
2107	struct _MI_SYSTEM_PTE_TYPE
2168	struct _MI_PTE_CHAIN_HEAD
2212	struct _MI_SPECIAL_POOL
3003	enum _MI_PFN_CACHE_ATTRIBUTE
4664	struct _MI_BAD_MEMORY_EVENT_ENTRY
5430	struct _CACHED_KSTACK_LIST
5438	enum _MI_KSTACK_TYPE
5452	enum _MI_MEMORY_HIGHLOW
5458	enum _MI_NODE_NONPAGED_POOL_BITMAP
5464	struct _MI_SYSTEM_NODE_INFORMATION
5529	struct _MI_NODE_INFORMATION
5559	unnamed struct for Flags in _MI_NODE_INFORMATION
5585	struct _MI_REBUILD_LARGE_PAGE_COUNTDOWN
5590	struct _MI_REBUILD_LARGE_PAGES
5623	struct _MMDEREFERENCE_SEGMENT_HEADER
5684	struct _MI_DECAY_TIMER_LINKAGE
5699	struct _MI_DECAY_TIMER_LINK
5700	unnamed union for u1 in _MI_DECAY_TIMER_LINK
5706	struct _MMWORKING_SET_EXPANSION_HEAD
5710	struct _MMPAGE_FILE_EXPANSION_FLAGS
5737	struct _MMPAGE_FILE_EXPANSION
5751	struct _MMMOD_WRITER_LISTHEAD
5759	union _MI_RESERVATION_CLUSTER_INFO
5767	struct _MI_MODWRITE_DATA
5833	enum _MI_MEMORY_EVENT_TYPES
5852	struct _MI_AVAILABLE_PAGE_WAIT_STATES
5857	enum _MI_AVAILABLE_PAGE_WAIT_TYPES
5863	struct _MI_PARTITION_FLAGS
5872	struct _MI_LDW_WORK_CONTEXT
5886	struct _MM_PAGED_POOL_INFO
5896	struct _MI_COMBINE_WORKITEM
5901	struct _MI_COMBINE_PAGE_LISTHEAD
5938	struct _MI_PAGEFILE_TRACES
5953	unnamed struct for MdlHack in _MI_PAGEFILE_TRACES
5985	struct _MI_PAGE_COMBINE_STATISTICS
6073	struct _MI_PAGE_COMBINING_SUPPORT
6102	struct _MI_PARTITION_MODWRITES
6207	struct _MI_PARTITION_STORES
6213	unnamed union for WriteAllStoreHintedPages in _MI_PARTITION_STORES
6248	struct _MI_PARTITION_SEGMENTS
6281	struct _MI_PARTITION_PAGE_LISTS
6365	struct _MI_PARTITION_COMMIT
6386	struct _MI_PARTITION_ZEROING
6417	struct _MI_PARTITION_STATISTICS
6446	struct _MI_PARTITION_CORE
6455	unnamed union for u in _MI_PARTITION_CORE
6533	struct _MI_VISIBLE_PARTITION
6623	struct _MI_PARTITION
7329	struct _MI_RESAVAIL_TRACKER
8095	struct _COLORED_PAGE_INFO
8510	struct _PTE_TRACKER
8534	struct _SYSPTES_HEADER
9354	struct _VI_POOL_PAGE_HEADER
9360	struct _VI_POOL_ENTRY_INUSE
9367	struct _VI_POOL_ENTRY
9375	struct _MI_VERIFIER_POOL_HEADER
9582	enum _MM_POOL_TYPES
9589	enum _MM_POOL_PRIORITIES
9596	enum _MM_POOL_FAILURE_REASONS
9613	enum _MM_PREEMPTIVE_TRIMS
10392	struct _MI_CLONE_BLOCK_FLAGS
10405	struct _MMCLONE_BLOCK
10431	struct _MMCLONE_DESCRIPTOR
10918	struct _MI_CFG_BITMAP_INFO
10924	enum _MI_CFG_BITMAP_TYPE
10933	struct _MI_USER_VA_INFO
11095	struct _MMWSLE_HASH
11121	struct _MMWSLENTRY
11193	struct _MMCLONE_HEADER
11196	struct _MMWSLE_FREE_ENTRY
11218	struct _MI_ACTIVE_WSLE_LISTHEAD
11223	struct _MMWSLE
11224	unnamed union for u1 in _MMWSLE
11246	struct _MMWSLE_NONDIRECT_HASH
11353	struct _MMWSL
11837	struct _MMEXTEND_INFO
11846	struct _SEGMENT_FLAGS
11901	struct _MI_EXTRA_IMAGE_INFORMATION
11914	struct _MI_SECTION_IMAGE_INFORMATION
11939	struct _SEGMENT
11965	unnamed union for u1 in _SEGMENT
11970	unnamed untion for u2 in _SEGMENT
12003	struct _MAPPED_FILE_SEGMENT
12026	struct _MMSUBSECTION_FLAGS
12045	struct _MMSECTION_FLAGS
12137	struct _MI_CONTROL_AREA_WAIT_BLOCK
12144	struct _IMAGE_SECURITY_CONTEXT
12202	struct _MI_IMAGE_SECURITY_REFERENCE
12213	struct _CONTROL_AREA
12221	unnamed union for u in _CONTROL_AREA
12235	unnamed union for u2 in _CONtROL_AREA
12236	unnamed struct for e2 in u2 in _CONTROL_AREA
12527	struct _MI_PER_SESSION_PROTOS
12542	unnamed union for u2 in _MI_PER_SESSION_PROTOS
12549	struct _MI_FILE_EXTENTS_WAIT_BLOCK
12554	struct _MI_FILE_EXTENTS
12562	struct _SUBSECTION
12583	unnamed union for u in _SUBSECTION
12591	unnamed union for u1 in _SUBSECTION
12616	struct _MSUBSECTION
12956	enum _MI_WORKING_SET_TYPE
12991	struct _MI_QUEUED_DEADSTACK_WORKITEM
12996	struct _MI_IO_CACHE_STATS
13011	struct _MI_PROBE_RAISE_TRACKER
13035	struct _MMSESSION
13060	struct _MI_FORCED_COMMITS
13065	struct _MI_RESUME_WORKITEM
13077	struct _MI_ZERO_COST_COUNTS
13082	struct _MI_DRIVER_VA
13115	enum _MI_IO_PFN_TYPE
13146	struct _MI_POOL_STATE
13215	struct _MI_SECTION_STATE
13351	struct _MI_SYSTEM_IMAGE_STATE
13380	struct _MI_SESSION_STATE
13427	struct _MI_PROCESS_STATE
13469	struct _MI_HARDWARE_STATE
13547	struct _MI_SYSTEM_VA_STATE
13616	struct _MI_COMBINE_STATE
13636	struct _MI_PARTITION_STATE
13662	struct _MI_SHUTDOWN_STATE
13705	struct _MI_ERROR_STATE
13748	struct _MI_ACCESS_LOG_STATE
13771	struct _MI_DEBUGGER_STATE
13792	struct _MI_STANDBY_STATE
13816	struct _MI_SYSTEM_PTE_STATE
13851	struct _MI_IO_PAGE_STATE
13868	struct _MI_PAGING_IO_STATE
13903	struct _MI_COMMON_PAGE_STATE
13933	struct _MI_SYSTEM_TRIM_STATE
13957	struct _MI_VISIBLE_STATE
14046	struct _MI_SYSTEM_INFORMATION
14354	struct _MI_REVERSE_VIEW_MAP
14444	struct _MMINPAGE_FLAGS
14482	struct _MMINPAGE_SUPPORT_FLOW_THROUGH
14530	struct _MMINPAGE_SUPPORT
14543	unnamed union for u3 in _MMINPAGE_SUPPORT
14547	unnamed union for u1 in _MMINPAGE_SUPPORT
14582	struct _SECTION
14597	unnamed union for u1 in _SECTION
14607	unnamed union for u in _SECTION
14683	struct _MMVAD_FLAGS
14703	struct _MMVAD_FLAGS1
14713	struct _MMVAD_FLAGS2
14725	struct _MMSECURE_FLAGS
14764	struct _MMADDRESS_LIST
14765	unnamed union for u1 in _MMADDRESS_LIST
14779	struct _MI_LARGEPAGE_MEMORY_INFO
14808	struct _MI_VAD_EVENT_BLOCK
14844	struct _MI_VAD_SEQUENTIAL_INFO
14849	struct _MMVAD_SHORT
14883	unnamed union for u in _MMVAD_SHORT
14888	unnamed union for u1 in _MMVAD_SHORT
14963	struct _MMVAD
14967	unnamed union for u2 in _MMVAD
14983	unnamed union for u4 in _MMVAD
15342	struct _MODWRITER_FLAGS
15349	struct _MMMOD_WRITER_MDL_ENTRY
15351	unnamed union for u in _MMMOD_WRITER_MDL_ENTRY
15383	struct _MI_PAGING_FILE_SPACE_BITMAPS
15417	struct _MMPAGING_FILE
15661	struct _LOCK_TRACKER
15674	struct _LOCK_HEADER
18909	enum _MI_DYNAMICBASE_BITMAP
20202	struct _MM_SESSION_SPACE_FLAGS
20214	struct _MI_SESSION_DRIVER_UNLOAD
20234	struct _MM_SESSION_SPACE
20238	unnamed union for u in _MM_SESSION_SPACE
21065	struct _MI_TRIAGE_DUMP_DATA

The header MI.H is not known in any Device Driver Kit (DDK) or Windows Driver Kit (WDK).