vfio/spapr: Introduce spapr backend and target interface

Introduce an empty spapr backend which will hold spapr specific
content, currently only prereg_listener and hostwin_list.

Also introduce two spapr specific callbacks add/del_window into
VFIOIOMMUOps. Instantiate a spapr ops with a helper setup_spapr_ops
and assign it to bcontainer->ops.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/vfio/spapr.c

@@ -24,6 +24,10 @@
 #include "qapi/error.h"
 #include "trace.h"
 
+typedef struct VFIOSpaprContainer {
+    VFIOContainer container;
+} VFIOSpaprContainer;
+
 static bool vfio_prereg_listener_skipped_section(MemoryRegionSection *section)
 {
     if (memory_region_is_iommu(section->mr)) {
@@ -421,6 +425,14 @@ void vfio_container_del_section_window(VFIOContainer *container,
     }
 }
 
+static VFIOIOMMUOps vfio_iommu_spapr_ops;
+
+static void setup_spapr_ops(VFIOContainerBase *bcontainer)
+{
+    vfio_iommu_spapr_ops = *bcontainer->ops;
+    bcontainer->ops = &vfio_iommu_spapr_ops;
+}
+
 int vfio_spapr_container_init(VFIOContainer *container, Error **errp)
 {
     VFIOContainerBase *bcontainer = &container->bcontainer;
@@ -486,6 +498,8 @@ int vfio_spapr_container_init(VFIOContainer *container, Error **errp)
                           0x1000);
     }
 
+    setup_spapr_ops(bcontainer);
+
     return 0;
 
 listener_unregister_exit:

include/hw/vfio/vfio-container-base.h

@@ -101,5 +101,11 @@ struct VFIOIOMMUOps {
     int (*set_dirty_page_tracking)(VFIOContainerBase *bcontainer, bool start);
     int (*query_dirty_bitmap)(VFIOContainerBase *bcontainer, VFIOBitmap *vbmap,
                               hwaddr iova, hwaddr size);
+    /* SPAPR specific */
+    int (*add_window)(VFIOContainerBase *bcontainer,
+                      MemoryRegionSection *section,
+                      Error **errp);
+    void (*del_window)(VFIOContainerBase *bcontainer,
+                       MemoryRegionSection *section);
 };
 #endif /* HW_VFIO_VFIO_CONTAINER_BASE_H */