[PATCH v3 19/37] vfio/spapr: Introduce spapr backend and target interface

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

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

Also introduce and instantiate a spapr specific target interface,
currently only has add/del_window callbacks.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/vfio/vfio-common.h         | 8 ++++++++
 include/hw/vfio/vfio-container-base.h | 2 ++
 hw/vfio/spapr.c                       | 8 ++++++++
 3 files changed, 18 insertions(+)

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 938f75e70c..a74e60e677 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -169,6 +169,14 @@ VFIOAddressSpace *vfio_get_address_space(AddressSpace *as);
 void vfio_put_address_space(VFIOAddressSpace *space);
 
 /* SPAPR specific */
+typedef struct VFIOIOMMUSpaprOps {
+    int (*add_window)(VFIOContainerBase *bcontainer,
+                      MemoryRegionSection *section,
+                      Error **errp);
+    void (*del_window)(VFIOContainerBase *bcontainer,
+                       MemoryRegionSection *section);
+} VFIOIOMMUSpaprOps;
+
 int vfio_container_add_section_window(VFIOContainer *container,
                                       MemoryRegionSection *section,
                                       Error **errp);
diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index 2ffafb0d58..1e1854d24f 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -31,6 +31,7 @@
 
 typedef struct VFIODevice VFIODevice;
 typedef struct VFIOIOMMUOps VFIOIOMMUOps;
+typedef struct VFIOIOMMUSpaprOps VFIOIOMMUSpaprOps;
 
 typedef struct {
     unsigned long *bitmap;
@@ -49,6 +50,7 @@ typedef struct VFIOAddressSpace {
  */
 typedef struct VFIOContainerBase {
     const VFIOIOMMUOps *ops;
+    const VFIOIOMMUSpaprOps *spapr_ops;
     VFIOAddressSpace *space;
     MemoryListener listener;
     Error *error;
diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c
index 5786377317..3739004151 100644
--- a/hw/vfio/spapr.c
+++ b/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)) {
@@ -384,6 +388,8 @@ void vfio_container_del_section_window(VFIOContainer *container,
     }
 }
 
+const VFIOIOMMUSpaprOps vfio_iommu_spapr_ops;
+
 bool vfio_spapr_container_init(VFIOContainer *container, Error **errp)
 {
     VFIOContainerBase *bcontainer = &container->bcontainer;
@@ -447,6 +453,8 @@ bool vfio_spapr_container_init(VFIOContainer *container, Error **errp)
                           0x1000);
     }
 
+    bcontainer->spapr_ops = &vfio_iommu_spapr_ops;
+
 listener_unregister_exit:
     if (v2) {
         memory_listener_unregister(&container->prereg_listener);
-- 
2.34.1