This pointer is going to be used to transfer a memory.
Once the memory page is copied the content the snapshot interested in is
saved for writing and we can make the page writable again.

Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
---
 migration/ram.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index ce3dead932..dc7dfe0726 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -188,6 +188,7 @@ struct RAMSrcPageRequest {
     RAMBlock *rb;
     hwaddr    offset;
     hwaddr    len;
+    void     *page_copy;
 
     QSIMPLEQ_ENTRY(RAMSrcPageRequest) next_req;
 };
@@ -265,6 +266,8 @@ struct PageSearchStatus {
     unsigned long page;
     /* Set once we wrap around */
     bool         complete_round;
+    /* Pointer to the cached page */
+    void *page_copy;
 };
 typedef struct PageSearchStatus PageSearchStatus;
 
-- 
2.17.0