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DXGK_HARDWARERESERVEDRANGES structure (d3dkmddi.h)

  • Article

The DXGK_HARDWARERESERVEDRANGES structure is used to store the hardware reserved memory ranges that were queried by the call the DXGKDDI_QUERYADAPTERINFO.

Syntax

typedef struct _DXGK_HARDWARERESERVEDRANGES {
  UINT32                     NumRanges;
  DXGK_PHYSICAL_MEMORY_RANGE *pPhysicalRanges;
} DXGK_HARDWARERESERVEDRANGES;

Members

NumRanges

The number of ranges that are reserved.

pPhysicalRanges

Pointer to a DXGK_PHYSICAL_MEMORY_RANGE structure that contains information about the physical memory ranges.

Remarks

The VidMm (Video Memory Manager) validates whether the ranges returned from DXGKDDI_QUERYADAPTERINFO overlap any regions of memory used by the NTOS (Windows NT-based operating system) memory manager. This validation ensures that the driver does not accidentally report a region of physical memory that is outside the reserved range, as this would violate the security guarantees of the feature.

See IOMMU-based GPU isolation for more information.

Requirements

Requirement Value
Minimum supported client Windows 10, version 1803
Header d3dkmddi.h