Add a helper, vfio_pci_device_alloc(), to allocate 'struct
vfio_pci_device'. The subsequent test patch will utilize this
to get the struct with very minimal initialization done.
Internally, let vfio_pci_device_init() also make use of this
function and later do the full initialization.

Symmetrically, add a free variant, vfio_pci_device_free(),
to be used in a similar fashion.

No functional change intended.

---
 .../vfio/lib/include/libvfio/vfio_pci_device.h |  2 ++
 .../selftests/vfio/lib/vfio_pci_device.c       | 18 ++++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h b/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
index 4ebdc00e20fc..3eabead717bb 100644
--- a/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
+++ b/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
@@ -38,6 +38,8 @@ struct vfio_pci_device {
 #define dev_info(_dev, _fmt, ...) printf("%s: " _fmt, (_dev)->bdf, ##__VA_ARGS__)
 #define dev_err(_dev, _fmt, ...) fprintf(stderr, "%s: " _fmt, (_dev)->bdf, ##__VA_ARGS__)
 
+struct vfio_pci_device *vfio_pci_device_alloc(const char *bdf, struct iommu *iommu);
+void vfio_pci_device_free(struct vfio_pci_device *device);
 struct vfio_pci_device *vfio_pci_device_init(const char *bdf, struct iommu *iommu);
 void vfio_pci_device_cleanup(struct vfio_pci_device *device);
 
diff --git a/tools/testing/selftests/vfio/lib/vfio_pci_device.c b/tools/testing/selftests/vfio/lib/vfio_pci_device.c
index f15065f53156..6f3f65021bd6 100644
--- a/tools/testing/selftests/vfio/lib/vfio_pci_device.c
+++ b/tools/testing/selftests/vfio/lib/vfio_pci_device.c
@@ -397,7 +397,7 @@ static void vfio_pci_iommufd_setup(struct vfio_pci_device *device,
 	vfio_device_attach_iommufd_pt(device->fd, device->iommu->ioas_id);
 }
 
-struct vfio_pci_device *vfio_pci_device_init(const char *bdf, struct iommu *iommu)
+struct vfio_pci_device *vfio_pci_device_alloc(const char *bdf, struct iommu *iommu)
 {
 	struct vfio_pci_device *device;
 
@@ -408,6 +408,20 @@ struct vfio_pci_device *vfio_pci_device_init(const char *bdf, struct iommu *iomm
 	device->iommu = iommu;
 	device->bdf = bdf;
 
+	return device;
+}
+
+void vfio_pci_device_free(struct vfio_pci_device *device)
+{
+	free(device);
+}
+
+struct vfio_pci_device *vfio_pci_device_init(const char *bdf, struct iommu *iommu)
+{
+	struct vfio_pci_device *device;
+
+	device = vfio_pci_device_alloc(bdf, iommu);
+
 	if (iommu->mode->container_path)
 		vfio_pci_container_setup(device, bdf, NULL);
 	else
@@ -440,5 +454,5 @@ void vfio_pci_device_cleanup(struct vfio_pci_device *device)
 	if (device->group_fd)
 		VFIO_ASSERT_EQ(close(device->group_fd), 0);
 
-	free(device);
+	vfio_pci_device_free(device);
 }
-- 
2.53.0.rc2.204.g2597b5adb4-goog