I/O Memory Management Unit

E653443

computer hardware component memory management unit

An I/O Memory Management Unit (IOMMU) is a hardware component that maps device-visible virtual addresses to physical memory addresses, enabling secure and efficient direct memory access (DMA) and device isolation.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (3)

Label	Occurrences
I/O Memory Management Unit canonical	1
IOMMU	1
MMU (Memory Management Unit)	1

How this entity was disambiguated

This entity first appeared as the object of triple T7278764 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: I/O Memory Management Unit
Context triple: [Intel VT-d, uses, I/O Memory Management Unit]

A. MMU
MMU is a large public university in Manchester, England, known for its diverse academic programs and strong links with industry and the creative sectors.
B. DMA
DMA (Direct Memory Access) is a computer feature that allows hardware devices to transfer data directly to and from system memory without continuous CPU involvement, improving performance and efficiency.
C. DMA
DMA is the IATA airport code for Davis-Monthan Air Force Base, a major U.S. Air Force installation near Tucson, Arizona.
D. Monolithic Memories
Monolithic Memories was a semiconductor company known for developing programmable read-only memory (PROM) and logic devices after being spun off from Fairchild Semiconductor.
E. IO/STA
IO/STA is the abbreviation for the Office of United Nations Specialized and Technical Agencies, a body that coordinates and liaises with the UN’s specialized and technical organizations.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: I/O Memory Management Unit
Target entity description: An I/O Memory Management Unit (IOMMU) is a hardware component that maps device-visible virtual addresses to physical memory addresses, enabling secure and efficient direct memory access (DMA) and device isolation.

A. MMU
MMU is a large public university in Manchester, England, known for its diverse academic programs and strong links with industry and the creative sectors.
B. DMA
DMA (Direct Memory Access) is a computer feature that allows hardware devices to transfer data directly to and from system memory without continuous CPU involvement, improving performance and efficiency.
C. DMA
DMA is the IATA airport code for Davis-Monthan Air Force Base, a major U.S. Air Force installation near Tucson, Arizona.
D. Monolithic Memories
Monolithic Memories was a semiconductor company known for developing programmable read-only memory (PROM) and logic devices after being spun off from Fairchild Semiconductor.
E. IO/STA
IO/STA is the abbreviation for the Office of United Nations Specialized and Technical Agencies, a body that coordinates and liaises with the UN’s specialized and technical organizations.
F. None of above. chosen

Statements (50)

Predicate	Object
instanceOf	computer hardware component ⓘ memory management unit ⓘ
abbreviation	IOMMU ⓘ linked to: I/O Memory Management Unit
benefit	better performance isolation between devices ⓘ improved system security ⓘ improved system stability ⓘ support for advanced virtualization features ⓘ
componentOf	chipset ⓘ platform I/O hub ⓘ system-on-chip ⓘ
configuredBy	hypervisor ⓘ operating system ⓘ
controls	device DMA address space ⓘ device access to host memory ⓘ
enables	address translation for DMA operations ⓘ fine-grained control of device memory access ⓘ isolation between devices and main memory ⓘ safe device passthrough to virtual machines ⓘ
hasFunction	enable secure direct memory access ⓘ enforce memory access permissions for devices ⓘ map device-visible virtual addresses to physical memory addresses ⓘ protect system memory from faulty or malicious devices ⓘ provide device isolation ⓘ remap DMA addresses ⓘ support virtualization of I/O devices ⓘ
implementedBy	AMD-Vi ⓘ linked to: AMD-V ARM System MMU ⓘ Intel VT-d ⓘ PowerPC IOMMU ⓘ
prevents	DMA attacks ⓘ devices accessing unauthorized memory regions ⓘ memory corruption by misbehaving devices ⓘ
relatedTo	I/O virtualization ⓘ linked to: virtio PCI Express ⓘ SR-IOV ⓘ direct memory access ⓘ memory protection ⓘ virtual memory ⓘ
supportsConcept	DMA remapping ⓘ device passthrough ⓘ interrupt remapping ⓘ multi-root I/O virtualization ⓘ single-root I/O virtualization ⓘ
usedIn	cloud computing infrastructure ⓘ computer systems ⓘ high-performance computing systems ⓘ servers ⓘ virtualized environments ⓘ
uses	page tables ⓘ translation structures maintained by the operating system ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Intel VT-d → uses → I/O Memory Management Unit ⓘ

W^X → enforcedBy → MMU (Memory Management Unit) ⓘ

linked to: I/O Memory Management Unit

I/O Memory Management Unit → abbreviation → IOMMU ⓘ