[PATCH 3/4] tests/migration-test: Add MEM_TYPE_SHMEM

[Peter Xu <peterx@redhat.com>]

Add memfd support for mem_type.  Will be used to replace memory_backend.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 tests/qtest/migration/framework.h | 13 +++++++++++++
 tests/qtest/migration/framework.c |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/tests/qtest/migration/framework.h b/tests/qtest/migration/framework.h
index 70705725bc..9dec21c344 100644
--- a/tests/qtest/migration/framework.h
+++ b/tests/qtest/migration/framework.h
@@ -19,8 +19,21 @@
 #define FILE_TEST_MARKER 'X'
 
 typedef enum {
+    /*
+     * Use memory-backend-ram, private mappings
+     */
     MEM_TYPE_ANON,
+    /*
+     * Use shmem file (under /dev/shm), shared mappings
+     */
     MEM_TYPE_SHMEM,
+    /*
+     * Use anonymous memfd, shared mappings.
+     *
+     * NOTE: this is internally almost the same as MEM_TYPE_SHMEM on Linux,
+     * but only anonymously allocated.
+     */
+    MEM_TYPE_MEMFD,
     MEM_TYPE_NUM,
 } MemType;
 
diff --git a/tests/qtest/migration/framework.c b/tests/qtest/migration/framework.c
index 6df0e56c2a..4d1663356a 100644
--- a/tests/qtest/migration/framework.c
+++ b/tests/qtest/migration/framework.c
@@ -276,6 +276,9 @@ static char *migrate_mem_type_get_opts(MemType type, const char *memory_size)
         backend = g_strdup_printf("-object memory-backend-file,mem-path=%s",
                                   shmem_path);
         break;
+    case MEM_TYPE_MEMFD:
+        backend = g_strdup("-object memory-backend-memfd");
+        break;
     case MEM_TYPE_ANON:
         backend = g_strdup("-object memory-backend-ram");
         share = false;
-- 
2.50.1