[Qemu-devel] [RFC][PATCH 05/14 v9] Add API to get memory mapping

[Wen Congyang]

Add API to get all virtual address and physical address mapping.
If the guest doesn't use paging, the virtual address is equal to the phyical
address. The virtual address and physical address mapping is for gdb's user, and
it does not include the memory that is not referenced by the page table. So if
you want to use crash to anaylze the vmcore, please do not specify -p option.

Signed-off-by: Wen Congyang <address@hidden>
---
 memory_mapping.c |   36 ++++++++++++++++++++++++++++++++++++
 memory_mapping.h |    8 ++++++++
 2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/memory_mapping.c b/memory_mapping.c
index 718f271..2ae8160 100644
--- a/memory_mapping.c
+++ b/memory_mapping.c
@@ -164,3 +164,39 @@ void memory_mapping_list_init(MemoryMappingList *list)
     list->last_mapping = NULL;
     QTAILQ_INIT(&list->head);
 }
+
+int qemu_get_guest_memory_mapping(MemoryMappingList *list)
+{
+    CPUState *env;
+    RAMBlock *block;
+    ram_addr_t offset, length;
+    int ret;
+    bool paging_mode;
+
+#if defined(CONFIG_HAVE_GET_MEMORY_MAPPING)
+    paging_mode = cpu_paging_enabled(first_cpu);
+    if (paging_mode) {
+        for (env = first_cpu; env != NULL; env = env->next_cpu) {
+            ret = cpu_get_memory_mapping(list, env);
+            if (ret < 0) {
+                return -1;
+            }
+        }
+        return 0;
+    }
+#else
+    return -2;
+#endif
+
+    /*
+     * If the guest doesn't use paging, the virtual address is equal to 
physical
+     * address.
+     */
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        offset = block->offset;
+        length = block->length;
+        create_new_memory_mapping(list, offset, offset, length);
+    }
+
+    return 0;
+}
diff --git a/memory_mapping.h b/memory_mapping.h
index 836b047..ebd7cf6 100644
--- a/memory_mapping.h
+++ b/memory_mapping.h
@@ -44,4 +44,12 @@ void memory_mapping_list_free(MemoryMappingList *list);
 
 void memory_mapping_list_init(MemoryMappingList *list);
 
+/*
+ * Return value:
+ *    0: success
+ *   -1: failed
+ *   -2: unsupported
+ */
+int qemu_get_guest_memory_mapping(MemoryMappingList *list);
+
 #endif
-- 
1.7.1