Introduce Xen PCI Passthrough, MSI

[qemu.git] / memory_mapping.c

diff --git a/memory_mapping.c b/memory_mapping.c
index adb159577d7b844c1af79a88d2e7da71975f7acf..6f5a2e3f7117bd4292126405e035b1ca45eb88f7 100644 (file)
--- a/memory_mapping.c
+++ b/memory_mapping.c
@@ -6,8 +6,8 @@
  * Authors:
  *     Wen Congyang <wency@cn.fujitsu.com>
  *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
  *
  */
 
@@ -165,8 +165,6 @@ void memory_mapping_list_init(MemoryMappingList *list)
     QTAILQ_INIT(&list->head);
 }
 
-#if defined(CONFIG_HAVE_GET_MEMORY_MAPPING)
-
 static CPUArchState *find_paging_enabled_cpu(CPUArchState *start_cpu)
 {
     CPUArchState *env;
@@ -210,7 +208,6 @@ int qemu_get_guest_memory_mapping(MemoryMappingList *list)
 
     return 0;
 }
-#endif
 
 void qemu_get_guest_simple_memory_mapping(MemoryMappingList *list)
 {
@@ -220,3 +217,30 @@ void qemu_get_guest_simple_memory_mapping(MemoryMappingList *list)
         create_new_memory_mapping(list, block->offset, 0, block->length);
     }
 }
+
+void memory_mapping_filter(MemoryMappingList *list, int64_t begin,
+                           int64_t length)
+{
+    MemoryMapping *cur, *next;
+
+    QTAILQ_FOREACH_SAFE(cur, &list->head, next, next) {
+        if (cur->phys_addr >= begin + length ||
+            cur->phys_addr + cur->length <= begin) {
+            QTAILQ_REMOVE(&list->head, cur, next);
+            list->num--;
+            continue;
+        }
+
+        if (cur->phys_addr < begin) {
+            cur->length -= begin - cur->phys_addr;
+            if (cur->virt_addr) {
+                cur->virt_addr += begin - cur->phys_addr;
+            }
+            cur->phys_addr = begin;
+        }
+
+        if (cur->phys_addr + cur->length > begin + length) {
+            cur->length -= cur->phys_addr + cur->length - begin - length;
+        }
+    }
+}