ns-d3dkmddi-_dxgk_hardwarereservedranges.md

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NS:d3dkmddi._DXGK_HARDWARERESERVEDRANGES	DXGK_HARDWARERESERVEDRANGES (d3dkmddi.h)	The DXGK_HARDWARERESERVEDRANGES structure is used to store the hardware reserved memory ranges that were queried by a call to DXGKDDI_QUERYADAPTERINFO.	07/22/2021	DXGK_HARDWARERESERVEDRANGES structure	_DXGK_HARDWARERESERVEDRANGES, DXGK_HARDWARERESERVEDRANGES,	d3dkmddi.h			Windows 10, version 1803									DXGK_HARDWARERESERVEDRANGES	Windows	display	_DXGK_HARDWARERESERVEDRANGES d3dkmddi/_DXGK_HARDWARERESERVEDRANGES DXGK_HARDWARERESERVEDRANGES d3dkmddi/DXGK_HARDWARERESERVEDRANGES	apiref	HeaderDef	d3dkmddi.h	_DXGK_HARDWARERESERVEDRANGES DXGK_HARDWARERESERVEDRANGES

DXGK_HARDWARERESERVEDRANGES structure

-description

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

-struct-fields

-field NumRanges

The number of ranges that are reserved.

-field 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.