vfio: Make VFIOContainerBase poiner parameter const in VFIOIOMMUOps callbacks

Some of the callbacks in VFIOIOMMUOps pass VFIOContainerBase poiner,
those callbacks only need read access to the sub object of VFIOContainerBase.
So make VFIOContainerBase, VFIOContainer and VFIOIOMMUFDContainer as const
in these callbacks.

Local functions called by those callbacks also need same changes to avoid
build error.

Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

4 files changed, 28 insertions, 25 deletions

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 6569732..08a3e57 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -204,7 +204,7 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainerBase *bcontainer)
     return true;
 }
 
-bool vfio_devices_all_device_dirty_tracking(VFIOContainerBase *bcontainer)
+bool vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer)
 {
     VFIODevice *vbasedev;
 
@@ -221,7 +221,8 @@ bool vfio_devices_all_device_dirty_tracking(VFIOContainerBase *bcontainer)
  * Check if all VFIO devices are running and migration is active, which is
  * essentially equivalent to the migration being in pre-copy phase.
  */
-bool vfio_devices_all_running_and_mig_active(VFIOContainerBase *bcontainer)
+bool
+vfio_devices_all_running_and_mig_active(const VFIOContainerBase *bcontainer)
 {
     VFIODevice *vbasedev;
 
@@ -1139,7 +1140,7 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
     return 0;
 }
 
-int vfio_devices_query_dirty_bitmap(VFIOContainerBase *bcontainer,
+int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                     VFIOBitmap *vbmap, hwaddr iova,
                                     hwaddr size)
 {
@@ -1162,7 +1163,7 @@ int vfio_devices_query_dirty_bitmap(VFIOContainerBase *bcontainer,
     return 0;
 }
 
-int vfio_get_dirty_bitmap(VFIOContainerBase *bcontainer, uint64_t iova,
+int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
                           uint64_t size, ram_addr_t ram_addr)
 {
     bool all_device_dirty_tracking =
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
index eee2dcf..1ffd25b 100644
--- a/hw/vfio/container-base.c
+++ b/hw/vfio/container-base.c
@@ -63,7 +63,7 @@ int vfio_container_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
     return bcontainer->ops->set_dirty_page_tracking(bcontainer, start);
 }
 
-int vfio_container_query_dirty_bitmap(VFIOContainerBase *bcontainer,
+int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                       VFIOBitmap *vbmap,
                                       hwaddr iova, hwaddr size)
 {
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 1dbf9b9..b22feb8 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -61,11 +61,11 @@ static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
     }
 }
 
-static int vfio_dma_unmap_bitmap(VFIOContainer *container,
+static int vfio_dma_unmap_bitmap(const VFIOContainer *container,
                                  hwaddr iova, ram_addr_t size,
                                  IOMMUTLBEntry *iotlb)
 {
-    VFIOContainerBase *bcontainer = &container->bcontainer;
+    const VFIOContainerBase *bcontainer = &container->bcontainer;
     struct vfio_iommu_type1_dma_unmap *unmap;
     struct vfio_bitmap *bitmap;
     VFIOBitmap vbmap;
@@ -117,11 +117,12 @@ unmap_exit:
 /*
  * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
  */
-static int vfio_legacy_dma_unmap(VFIOContainerBase *bcontainer, hwaddr iova,
-                                 ram_addr_t size, IOMMUTLBEntry *iotlb)
+static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer,
+                                 hwaddr iova, ram_addr_t size,
+                                 IOMMUTLBEntry *iotlb)
 {
-    VFIOContainer *container = container_of(bcontainer, VFIOContainer,
-                                            bcontainer);
+    const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
+                                                  bcontainer);
     struct vfio_iommu_type1_dma_unmap unmap = {
         .argsz = sizeof(unmap),
         .flags = 0,
@@ -174,11 +175,11 @@ static int vfio_legacy_dma_unmap(VFIOContainerBase *bcontainer, hwaddr iova,
     return 0;
 }
 
-static int vfio_legacy_dma_map(VFIOContainerBase *bcontainer, hwaddr iova,
+static int vfio_legacy_dma_map(const VFIOContainerBase *bcontainer, hwaddr iova,
                                ram_addr_t size, void *vaddr, bool readonly)
 {
-    VFIOContainer *container = container_of(bcontainer, VFIOContainer,
-                                            bcontainer);
+    const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
+                                                  bcontainer);
     struct vfio_iommu_type1_dma_map map = {
         .argsz = sizeof(map),
         .flags = VFIO_DMA_MAP_FLAG_READ,
@@ -207,11 +208,12 @@ static int vfio_legacy_dma_map(VFIOContainerBase *bcontainer, hwaddr iova,
     return -errno;
 }
 
-static int vfio_legacy_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
-                                               bool start)
+static int
+vfio_legacy_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
+                                    bool start)
 {
-    VFIOContainer *container = container_of(bcontainer, VFIOContainer,
-                                            bcontainer);
+    const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
+                                                  bcontainer);
     int ret;
     struct vfio_iommu_type1_dirty_bitmap dirty = {
         .argsz = sizeof(dirty),
@@ -233,12 +235,12 @@ static int vfio_legacy_set_dirty_page_tracking(VFIOContainerBase *bcontainer,
     return ret;
 }
 
-static int vfio_legacy_query_dirty_bitmap(VFIOContainerBase *bcontainer,
+static int vfio_legacy_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                           VFIOBitmap *vbmap,
                                           hwaddr iova, hwaddr size)
 {
-    VFIOContainer *container = container_of(bcontainer, VFIOContainer,
-                                            bcontainer);
+    const VFIOContainer *container = container_of(bcontainer, VFIOContainer,
+                                                  bcontainer);
     struct vfio_iommu_type1_dirty_bitmap *dbitmap;
     struct vfio_iommu_type1_dirty_bitmap_get *range;
     int ret;
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 5accd26..87a561c 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -26,10 +26,10 @@
 #include "qemu/chardev_open.h"
 #include "pci.h"
 
-static int iommufd_cdev_map(VFIOContainerBase *bcontainer, hwaddr iova,
+static int iommufd_cdev_map(const VFIOContainerBase *bcontainer, hwaddr iova,
                             ram_addr_t size, void *vaddr, bool readonly)
 {
-    VFIOIOMMUFDContainer *container =
+    const VFIOIOMMUFDContainer *container =
         container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
 
     return iommufd_backend_map_dma(container->be,
@@ -37,11 +37,11 @@ static int iommufd_cdev_map(VFIOContainerBase *bcontainer, hwaddr iova,
                                    iova, size, vaddr, readonly);
 }
 
-static int iommufd_cdev_unmap(VFIOContainerBase *bcontainer,
+static int iommufd_cdev_unmap(const VFIOContainerBase *bcontainer,
                               hwaddr iova, ram_addr_t size,
                               IOMMUTLBEntry *iotlb)
 {
-    VFIOIOMMUFDContainer *container =
+    const VFIOIOMMUFDContainer *container =
         container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
 
     /* TODO: Handle dma_unmap_bitmap with iotlb args (migration) */