[PATCH for-9.0 05/10] vfio/container: Introduce a VFIOIOMMU legacy QOM interface

["Cédric Le Goater" <clg@redhat.com>]

Convert the legacy VFIOIOMMUOps struct to the new VFIOIOMMU QOM
interface. The set of of operations for this backend can be referenced
with a literal typename instead of a C struct. This will simplify
support of multiple backends.

Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 include/hw/vfio/vfio-common.h         |  1 -
 include/hw/vfio/vfio-container-base.h |  1 +
 hw/vfio/common.c                      |  6 ++-
 hw/vfio/container.c                   | 59 +++++++++++++++++++++++----
 4 files changed, 56 insertions(+), 11 deletions(-)

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index b8aa8a549532442a31c8e85ce385c992d84f6bd5..14c497b6b0a79466e8f567aceed384ec2c75ea90 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -210,7 +210,6 @@ typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
 typedef QLIST_HEAD(VFIODeviceList, VFIODevice) VFIODeviceList;
 extern VFIOGroupList vfio_group_list;
 extern VFIODeviceList vfio_device_list;
-extern const VFIOIOMMUOps vfio_legacy_ops;
 extern const VFIOIOMMUOps vfio_iommufd_ops;
 extern const MemoryListener vfio_memory_listener;
 extern int vfio_kvm_device_fd;
diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index 81d49fe562d3840859096dd8a62ac38d62314939..a31fd9c2e3b9a571083ea8987ac27e91b332c170 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -95,6 +95,7 @@ void vfio_container_destroy(VFIOContainerBase *bcontainer);
 typedef struct VFIOIOMMU VFIOIOMMU;
 
 #define TYPE_VFIO_IOMMU "vfio-iommu"
+#define TYPE_VFIO_IOMMU_LEGACY TYPE_VFIO_IOMMU "-legacy"
 
 #define VFIO_IOMMU(obj) INTERFACE_CHECK(VFIOIOMMU, (obj), TYPE_VFIO_IOMMU)
 DECLARE_CLASS_CHECKERS(VFIOIOMMUClass, VFIO_IOMMU, TYPE_VFIO_IOMMU)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 49dab41566f07ba7be1100fed1973e028d34467c..2329d0efc8c1d617f0bfee5283e82b295d2d477d 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1503,13 +1503,17 @@ retry:
 int vfio_attach_device(char *name, VFIODevice *vbasedev,
                        AddressSpace *as, Error **errp)
 {
-    const VFIOIOMMUClass *ops = &vfio_legacy_ops;
+    const VFIOIOMMUClass *ops =
+        VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_LEGACY));
 
 #ifdef CONFIG_IOMMUFD
     if (vbasedev->iommufd) {
         ops = &vfio_iommufd_ops;
     }
 #endif
+
+    assert(ops);
+
     return ops->attach_device(name, vbasedev, as, errp);
 }
 
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index f4a0434a5239bfb6a17b91c8879cb98e686afccc..fdf4e116570013732d48071a5122d25b02da715c 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -369,10 +369,30 @@ static int vfio_get_iommu_type(VFIOContainer *container,
     return -EINVAL;
 }
 
+/*
+ * vfio_get_iommu_ops - get a VFIOIOMMUClass associated with a type
+ */
+static const VFIOIOMMUClass *vfio_get_iommu_class(int iommu_type, Error **errp)
+{
+    ObjectClass *klass = NULL;
+
+    switch (iommu_type) {
+    case VFIO_TYPE1v2_IOMMU:
+    case VFIO_TYPE1_IOMMU:
+        klass = object_class_by_name(TYPE_VFIO_IOMMU_LEGACY);
+        break;
+    default:
+        g_assert_not_reached();
+    };
+
+    return VFIO_IOMMU_CLASS(klass);
+}
+
 static int vfio_init_container(VFIOContainer *container, int group_fd,
                                VFIOAddressSpace *space, Error **errp)
 {
     int iommu_type, ret;
+    const VFIOIOMMUClass *vioc = NULL;
 
     iommu_type = vfio_get_iommu_type(container, errp);
     if (iommu_type < 0) {
@@ -401,7 +421,14 @@ static int vfio_init_container(VFIOContainer *container, int group_fd,
     }
 
     container->iommu_type = iommu_type;
-    vfio_container_init(&container->bcontainer, space, &vfio_legacy_ops);
+
+    vioc = vfio_get_iommu_class(iommu_type, errp);
+    if (!vioc) {
+        error_setg(errp, "No available IOMMU models");
+        return -EINVAL;
+    }
+
+    vfio_container_init(&container->bcontainer, space, vioc);
     return 0;
 }
 
@@ -1098,12 +1125,26 @@ out_single:
     return ret;
 }
 
-const VFIOIOMMUOps vfio_legacy_ops = {
-    .dma_map = vfio_legacy_dma_map,
-    .dma_unmap = vfio_legacy_dma_unmap,
-    .attach_device = vfio_legacy_attach_device,
-    .detach_device = vfio_legacy_detach_device,
-    .set_dirty_page_tracking = vfio_legacy_set_dirty_page_tracking,
-    .query_dirty_bitmap = vfio_legacy_query_dirty_bitmap,
-    .pci_hot_reset = vfio_legacy_pci_hot_reset,
+static void vfio_iommu_legacy_class_init(ObjectClass *klass, void *data)
+{
+    VFIOIOMMUClass *vioc = VFIO_IOMMU_CLASS(klass);
+
+    vioc->dma_map = vfio_legacy_dma_map;
+    vioc->dma_unmap = vfio_legacy_dma_unmap;
+    vioc->attach_device = vfio_legacy_attach_device;
+    vioc->detach_device = vfio_legacy_detach_device;
+    vioc->set_dirty_page_tracking = vfio_legacy_set_dirty_page_tracking;
+    vioc->query_dirty_bitmap = vfio_legacy_query_dirty_bitmap;
+    vioc->pci_hot_reset = vfio_legacy_pci_hot_reset;
 };
+
+static const TypeInfo types[] = {
+    {
+        .name = TYPE_VFIO_IOMMU_LEGACY,
+        .parent = TYPE_VFIO_IOMMU,
+        .class_init = vfio_iommu_legacy_class_init,
+        .class_size = sizeof(VFIOIOMMUClass),
+    },
+};
+
+DEFINE_TYPES(types)
-- 
2.43.0