From: John Levon <john.levon@nutanix.com>

Allow attachment by explicitly passing a TYPE_VFIO_IOMMU_* string;
vfio-user will use this later.

Signed-off-by: John Levon <john.levon@nutanix.com>
---
 hw/vfio/common.c              | 25 ++++++++++++++++++-------
 include/hw/vfio/vfio-common.h |  3 +++
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index ac89bc4b02..8c3b6ad75a 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1542,21 +1542,32 @@ retry:
     return info;
 }
 
-bool vfio_attach_device(char *name, VFIODevice *vbasedev,
-                        AddressSpace *as, Error **errp)
+bool vfio_attach_device_by_iommu_type(const char *iommu_type, char *name,
+                                      VFIODevice *vbasedev, AddressSpace *as,
+                                      Error **errp)
 {
-    const VFIOIOMMUClass *ops =
-        VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_LEGACY));
+    const VFIOIOMMUClass *ops;
 
-    if (vbasedev->iommufd) {
-        ops = VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_IOMMUFD));
-    }
+    ops = VFIO_IOMMU_CLASS(object_class_by_name(iommu_type));
 
     assert(ops);
 
     return ops->attach_device(name, vbasedev, as, errp);
 }
 
+bool vfio_attach_device(char *name, VFIODevice *vbasedev,
+                       AddressSpace *as, Error **errp)
+{
+    const char *iommu_type = TYPE_VFIO_IOMMU_LEGACY;
+
+    if (vbasedev->iommufd) {
+        iommu_type = TYPE_VFIO_IOMMU_IOMMUFD;
+    }
+
+    return vfio_attach_device_by_iommu_type(iommu_type, name, vbasedev,
+                                            as, errp);
+}
+
 void vfio_detach_device(VFIODevice *vbasedev)
 {
     if (!vbasedev->bcontainer) {
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index d112c9b72f..8e13d30d2c 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -225,6 +225,9 @@ void vfio_reset_handler(void *opaque);
 struct vfio_device_info *vfio_get_device_info(int fd);
 bool vfio_attach_device(char *name, VFIODevice *vbasedev,
                         AddressSpace *as, Error **errp);
+bool vfio_attach_device_by_iommu_type(const char *iommu_type, char *name,
+                                      VFIODevice *vbasedev, AddressSpace *as,
+                                      Error **errp);
 void vfio_detach_device(VFIODevice *vbasedev);
 
 int vfio_kvm_device_add_fd(int fd, Error **errp);
-- 
2.34.1