vfio: Add ability to pass VFIO devices to qemu

VFIO is meant for exposing exposing direct device access
to the virtual machine.
Add ability to append VFIO devices to qemu command line.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

qemu.go

@@ -591,6 +591,32 @@ func (blkdev BlockDevice) QemuParams(config *Config) []string {
 	return qemuParams
 }
 
+// VFIODevice represents a qemu vfio device meant for direct access by guest OS.
+type VFIODevice struct {
+	// Bus-Device-Function of device
+	BDF string
+}
+
+// Valid returns true if the VFIODevice structure is valid and complete.
+func (vfioDev VFIODevice) Valid() bool {
+	if vfioDev.BDF == "" {
+		return false
+	}
+
+	return true
+}
+
+// QemuParams returns the qemu parameters built out of this vfio device.
+func (vfioDev VFIODevice) QemuParams(config *Config) []string {
+	var qemuParams []string
+
+	deviceParam := fmt.Sprintf("vfio-pci,host=%s", vfioDev.BDF)
+	qemuParams = append(qemuParams, "-device")
+	qemuParams = append(qemuParams, deviceParam)
+
+	return qemuParams
+}
+
 // RTCBaseType is the qemu RTC base time type.
 type RTCBaseType string
 

qemu_test.go

@@ -217,6 +217,16 @@ func TestAppendDeviceBlock(t *testing.T) {
 	testAppend(blkdev, deviceBlockString, t)
 }
 
+var deviceVFIOString = "-device vfio-pci,host=02:10.0"
+
+func TestAppendDeviceVFIO(t *testing.T) {
+	vfioDevice := VFIODevice{
+		BDF: "02:10.0",
+	}
+
+	testAppend(vfioDevice, deviceVFIOString, t)
+}
+
 func TestAppendEmptyDevice(t *testing.T) {
 	device := SerialDevice{}