vfio: Introduce a new header file for VFIOIOMMUFD declarations

Gather all VFIOIOMMUFD related declarations introduced by commits
5ee3dc7af785 ("vfio/iommufd: Implement the iommufd backend") and
5b1e96e65403 ("vfio/iommufd: Introduce auto domain creation") into
"vfio-iommufd.h". This to reduce exposure of VFIO internals in
"hw/vfio/vfio-common.h".

Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Link: https://lore.kernel.org/qemu-devel/20250318095415.670319-10-clg@redhat.com
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/20250326075122.1299361-11-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

3 files changed, 38 insertions, 18 deletions

diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 42c8412bbf..7196c40801 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -25,6 +25,7 @@
 #include "qemu/cutils.h"
 #include "qemu/chardev_open.h"
 #include "pci.h"
+#include "vfio-iommufd.h"
 
 static int iommufd_cdev_map(const VFIOContainerBase *bcontainer, hwaddr iova,
                             ram_addr_t size, void *vaddr, bool readonly)
diff --git a/hw/vfio/vfio-iommufd.h b/hw/vfio/vfio-iommufd.h
new file mode 100644
index 0000000000..07ea0f4304
--- /dev/null
+++ b/hw/vfio/vfio-iommufd.h
@@ -0,0 +1,34 @@
+/*
+ * VFIO iommufd
+ *
+ * Copyright Red Hat, Inc. 2025
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef HW_VFIO_VFIO_IOMMUFD_H
+#define HW_VFIO_VFIO_IOMMUFD_H
+
+#include "hw/vfio/vfio-container-base.h"
+
+typedef struct VFIODevice VFIODevice;
+
+typedef struct VFIOIOASHwpt {
+    uint32_t hwpt_id;
+    uint32_t hwpt_flags;
+    QLIST_HEAD(, VFIODevice) device_list;
+    QLIST_ENTRY(VFIOIOASHwpt) next;
+} VFIOIOASHwpt;
+
+typedef struct IOMMUFDBackend IOMMUFDBackend;
+
+typedef struct VFIOIOMMUFDContainer {
+    VFIOContainerBase bcontainer;
+    IOMMUFDBackend *be;
+    uint32_t ioas_id;
+    QLIST_HEAD(, VFIOIOASHwpt) hwpt_list;
+} VFIOIOMMUFDContainer;
+
+OBJECT_DECLARE_SIMPLE_TYPE(VFIOIOMMUFDContainer, VFIO_IOMMU_IOMMUFD);
+
+#endif /* HW_VFIO_VFIO_IOMMUFD_H */
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 83b1f7be80..9ec90fbac0 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -69,27 +69,12 @@ typedef struct VFIOContainer {
 
 OBJECT_DECLARE_SIMPLE_TYPE(VFIOContainer, VFIO_IOMMU_LEGACY);
 
-typedef struct IOMMUFDBackend IOMMUFDBackend;
-
-typedef struct VFIOIOASHwpt {
-    uint32_t hwpt_id;
-    uint32_t hwpt_flags;
-    QLIST_HEAD(, VFIODevice) device_list;
-    QLIST_ENTRY(VFIOIOASHwpt) next;
-} VFIOIOASHwpt;
-
-typedef struct VFIOIOMMUFDContainer {
-    VFIOContainerBase bcontainer;
-    IOMMUFDBackend *be;
-    uint32_t ioas_id;
-    QLIST_HEAD(, VFIOIOASHwpt) hwpt_list;
-} VFIOIOMMUFDContainer;
-
-OBJECT_DECLARE_SIMPLE_TYPE(VFIOIOMMUFDContainer, VFIO_IOMMU_IOMMUFD);
-
 typedef struct VFIODeviceOps VFIODeviceOps;
 typedef struct VFIOMigration VFIOMigration;
 
+typedef struct IOMMUFDBackend IOMMUFDBackend;
+typedef struct VFIOIOASHwpt VFIOIOASHwpt;
+
 typedef struct VFIODevice {
     QLIST_ENTRY(VFIODevice) next;
     QLIST_ENTRY(VFIODevice) container_next;