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DXGKDDI_QUERYPROBEDBARS callback function (dispmprt.h)

  • Article

This routine allows a non-privileged virtual machine to find out what would have been read from a Virtual Function’s Base Address Registers after they had been written with the value (-1).

Syntax

DXGKDDI_QUERYPROBEDBARS DxgkddiQueryprobedbars;

void DxgkddiQueryprobedbars(
  [in]      HANDLE Context,
  [in, out] DXGKARG_QUERYPROBEDBARS *pArgs
)
{...}

Parameters

[in] Context

The miniport context that is returned by the driver in the DXGKDDI_SRIOV_INTERFACE structure.

[in, out] pArgs

Pointer to the DXGKARG_QUERYPROBEDBARS structure.

Return value

None

Remarks

This is part of the normal process of setting up a PCI device, and the result allows the PCI driver to know how much address space would be decoded by the device after it was enabled. Because writing -1 to the physical BARS could be considered a security risk, this step of PCI enumeration is emulated.

Requirements

Requirement Value
Header dispmprt.h