DXGKDDI_MITIGABLE_DEVICE_INTERFACE structure (dispmprt.h)

This device interface specifies the parts of the device base address registers that need to be intercepted and mitigated.

These ranges could be sections of the hardware that are protected or could result in crashes or exploits from the guest virtual machine if they were exposed. As part of a defense-in-depth approach, these sensitive hardware regions are exposed and protected not by the user mode device emulator, but instead by the more trusted kernel mode device driver.

Syntax

typedef struct _DXGKDDI_MITIGABLE_DEVICE_INTERFACE {
  IN USHORT                             Size;
  IN USHORT                             Version;
  OUT PVOID                             Context;
  OUT PINTERFACE_REFERENCE              InterfaceReference;
  OUT PINTERFACE_DEREFERENCE            InterfaceDereference;
  OUT PDXGKDDI_QUERYMITIGATEDRANGECOUNT DxgkDdiQueryMitigatedRangeCount;
  OUT PDXGKDDI_QUERYMITIGATEDRANGES     DxgkDdiQueryMitigatedRanges;
} DXGKDDI_MITIGABLE_DEVICE_INTERFACE, *PDXGKDDI_MITIGABLE_DEVICE_INTERFACE;

Members

Size

Size.

Version

Represents the DXGKDDI_MITIGABLE_DEVICE_INTERFACE_VERSION.

Context

Device context.

InterfaceReference

Reference.

InterfaceDereference

Dereference.

DxgkDdiQueryMitigatedRangeCount

Called to query the mitigated range count.

DxgkDdiQueryMitigatedRanges

Called to query the mitigated ranges.

Remarks

This interface is optional but must be implemented for any GPU where a virtual function has hardware resources, which are unsafe to directly expose to a VM. If a driver uses mitigation, it must also provide a user mode emulation DLL that implements the mitigation. The KMD could decide that the mitigated ranges need remapping and DxgkCbMitigatedRangeUpdate callback is provided to notify Dxgkrnl. Dxgkrnl will re-enumerate mitigated ranges asynchronously.

Requirements

Requirement	Value
Header	dispmprt.h