[PULL 03/21] util: accept iova_tree_remove_parameter by value

[Jason Wang <jasowang@redhat.com>]

From: Eugenio Pérez <eperezma@redhat.com>

It's convenient to call iova_tree_remove from a map returned from
iova_tree_find or iova_tree_find_iova. With the current code this is not
possible, since we will free it, and then we will try to search for it
again.

Fix it making accepting the map by value, forcing a copy of the
argument. Not applying a fixes tag, since there is no use like that at
the moment.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/i386/intel_iommu.c       | 6 +++---
 hw/virtio/vhost-iova-tree.c | 2 +-
 hw/virtio/vhost-iova-tree.h | 2 +-
 hw/virtio/vhost-vdpa.c      | 6 +++---
 include/qemu/iova-tree.h    | 2 +-
 net/vhost-vdpa.c            | 4 ++--
 util/iova-tree.c            | 4 ++--
 7 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 2162394..05d53a1 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1187,7 +1187,7 @@ static int vtd_page_walk_one(IOMMUTLBEvent *event, vtd_page_walk_info *info)
                     return ret;
                 }
                 /* Drop any existing mapping */
-                iova_tree_remove(as->iova_tree, &target);
+                iova_tree_remove(as->iova_tree, target);
                 /* Recover the correct type */
                 event->type = IOMMU_NOTIFIER_MAP;
                 entry->perm = cache_perm;
@@ -1200,7 +1200,7 @@ static int vtd_page_walk_one(IOMMUTLBEvent *event, vtd_page_walk_info *info)
             trace_vtd_page_walk_one_skip_unmap(entry->iova, entry->addr_mask);
             return 0;
         }
-        iova_tree_remove(as->iova_tree, &target);
+        iova_tree_remove(as->iova_tree, target);
     }
 
     trace_vtd_page_walk_one(info->domain_id, entry->iova,
@@ -3563,7 +3563,7 @@ static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)
 
     map.iova = n->start;
     map.size = size;
-    iova_tree_remove(as->iova_tree, &map);
+    iova_tree_remove(as->iova_tree, map);
 }
 
 static void vtd_address_space_unmap_all(IntelIOMMUState *s)
diff --git a/hw/virtio/vhost-iova-tree.c b/hw/virtio/vhost-iova-tree.c
index 67bf6d5..3d03395 100644
--- a/hw/virtio/vhost-iova-tree.c
+++ b/hw/virtio/vhost-iova-tree.c
@@ -104,7 +104,7 @@ int vhost_iova_tree_map_alloc(VhostIOVATree *tree, DMAMap *map)
  * @iova_tree: The vhost iova tree
  * @map: The map to remove
  */
-void vhost_iova_tree_remove(VhostIOVATree *iova_tree, const DMAMap *map)
+void vhost_iova_tree_remove(VhostIOVATree *iova_tree, DMAMap map)
 {
     iova_tree_remove(iova_tree->iova_taddr_map, map);
 }
diff --git a/hw/virtio/vhost-iova-tree.h b/hw/virtio/vhost-iova-tree.h
index 6a4f24e..4adfd79 100644
--- a/hw/virtio/vhost-iova-tree.h
+++ b/hw/virtio/vhost-iova-tree.h
@@ -22,6 +22,6 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(VhostIOVATree, vhost_iova_tree_delete);
 const DMAMap *vhost_iova_tree_find_iova(const VhostIOVATree *iova_tree,
                                         const DMAMap *map);
 int vhost_iova_tree_map_alloc(VhostIOVATree *iova_tree, DMAMap *map);
-void vhost_iova_tree_remove(VhostIOVATree *iova_tree, const DMAMap *map);
+void vhost_iova_tree_remove(VhostIOVATree *iova_tree, DMAMap map);
 
 #endif
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 7e28d2f..87e0ad3 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -240,7 +240,7 @@ static void vhost_vdpa_listener_region_add(MemoryListener *listener,
 
 fail_map:
     if (v->shadow_vqs_enabled) {
-        vhost_iova_tree_remove(v->iova_tree, &mem_region);
+        vhost_iova_tree_remove(v->iova_tree, mem_region);
     }
 
 fail:
@@ -300,7 +300,7 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener,
             return;
         }
         iova = result->iova;
-        vhost_iova_tree_remove(v->iova_tree, result);
+        vhost_iova_tree_remove(v->iova_tree, *result);
     }
     vhost_vdpa_iotlb_batch_begin_once(v);
     ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
@@ -944,7 +944,7 @@ static bool vhost_vdpa_svq_map_ring(struct vhost_vdpa *v, DMAMap *needle,
                            needle->perm == IOMMU_RO);
     if (unlikely(r != 0)) {
         error_setg_errno(errp, -r, "Cannot map region to device");
-        vhost_iova_tree_remove(v->iova_tree, needle);
+        vhost_iova_tree_remove(v->iova_tree, *needle);
     }
 
     return r == 0;
diff --git a/include/qemu/iova-tree.h b/include/qemu/iova-tree.h
index 16bbfdf..8528e5c 100644
--- a/include/qemu/iova-tree.h
+++ b/include/qemu/iova-tree.h
@@ -73,7 +73,7 @@ int iova_tree_insert(IOVATree *tree, const DMAMap *map);
  * all the mappings that are included in the provided range will be
  * removed from the tree.  Here map->translated_addr is meaningless.
  */
-void iova_tree_remove(IOVATree *tree, const DMAMap *map);
+void iova_tree_remove(IOVATree *tree, DMAMap map);
 
 /**
  * iova_tree_find:
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 303447a..a49e7e6 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -244,7 +244,7 @@ static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr)
         error_report("Device cannot unmap: %s(%d)", g_strerror(r), r);
     }
 
-    vhost_iova_tree_remove(tree, map);
+    vhost_iova_tree_remove(tree, *map);
 }
 
 static size_t vhost_vdpa_net_cvq_cmd_len(void)
@@ -297,7 +297,7 @@ static bool vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v,
     return true;
 
 dma_map_err:
-    vhost_iova_tree_remove(v->iova_tree, &map);
+    vhost_iova_tree_remove(v->iova_tree, map);
     return false;
 }
 
diff --git a/util/iova-tree.c b/util/iova-tree.c
index fee530a..5367897 100644
--- a/util/iova-tree.c
+++ b/util/iova-tree.c
@@ -164,11 +164,11 @@ void iova_tree_foreach(IOVATree *tree, iova_tree_iterator iterator)
     g_tree_foreach(tree->tree, iova_tree_traverse, iterator);
 }
 
-void iova_tree_remove(IOVATree *tree, const DMAMap *map)
+void iova_tree_remove(IOVATree *tree, DMAMap map)
 {
     const DMAMap *overlap;
 
-    while ((overlap = iova_tree_find(tree, map))) {
+    while ((overlap = iova_tree_find(tree, &map))) {
         g_tree_remove(tree->tree, overlap);
     }
 }
-- 
2.7.4