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SET_VIRTUAL_DEVICE_DATA callback function (wdm.h)

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The SetVirtualFunctionData routine writes data to the PCI Express (PCIe) configuration space of a virtual function (VF) on a device that supports the single root I/O virtualization (SR-IOV) interface.

Syntax

SET_VIRTUAL_DEVICE_DATA SetVirtualDeviceData;

ULONG SetVirtualDeviceData(
  [in, out] PVOID Context,
  [in]      USHORT VirtualFunction,
  [in]      PVOID Buffer,
  [in]      ULONG Offset,
  [in]      ULONG Length
)
{...}

Parameters

[in, out] Context

A pointer to interface-specific context information. The caller passes the value that is passed as the Context member of the PCI_VIRTUALIZATION_INTERFACE structure for the interface.

[in] VirtualFunction

A zero-based value that specifies the VF on the device from which data is to be written.

[in] Buffer

A pointer to the buffer that contains the configuration information to be written to the PCIe configuration space of the VF.

[in] Offset

The offset into the PCIe configuration space data of the VF. This member specifies where this write operation begins.

[in] Length

The length, in bytes, of the data to be written.

Return value

The *SetVirtualFunctionData routine returns the length, in bytes, of the PCIe configuration data that was written after a successful write operation. If the write operation is unsuccessful, the routine returns zero.

Remarks

The *SetVirtualFunctionData routine is similar to the SetBusData routine, except that it writes PCIe configuration data to a VF instead of to a device's physical function (PF).

The *SetVirtualFunctionData routine is provided by the GUID_PCI_VIRTUALIZATION_INTERFACE interface. The SetBusData routine is provided by the GUID_BUS_INTERFACE_STANDARD interface.

The virtualization stack calls *SetVirtualFunctionData when a driver that is running in the guest operating system calls the SetBusData routine.

Requirements

Requirement Value
Minimum supported client Supported in Windows Server 2012 and later versions of Windows.
Target Platform Desktop
Header wdm.h (include Wdm.h)
IRQL IRQL <= APC_LEVEL

See also

SetBusData

PCI_VIRTUALIZATION_INTERFACE