// wdm.h

typedef struct _IOMMU_INTERFACE_STATE_CHANGE {
  IOMMU_INTERFACE_STATE_CHANGE_FIELDS PresentFields;
  ULONG                               AvailableDomainTypes;
} IOMMU_INTERFACE_STATE_CHANGE, *PIOMMU_INTERFACE_STATE_CHANGE;
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Windows Driver Kit DDI reference (ns-wdm-iommu_interface_state_change)

Description

IOMMU_INTERFACE_STATE_CHANGE represents the IOMMU interface state at the time a state change callback is invoked. When an IOMMU_INTERFACE_STATE_CHANGE_CALLBACK is invoked, the PresentFields indicate which IOMMU_INTERFACE_STATE_CHANGE_FIELDS have changed while the rest of the members of IOMMU_INTERFACE_STATE_CHANGE provide the new state.

Members

`PresentFields`

Indicates which IOMMU interface states have changed. If a field within this structure is set to 1, this indicates a state change for that state field.

`AvailableDomainTypes`

Represents all the domain types currently available. Each set bit represents an available domain type: (1 << IOMMU_DMA_DOMAIN_TYPE). See IOMMU_DMA_DOMAIN_TYPE for more details.

IOMMU_INTERFACE_STATE_CHANGE - NtDoc