diff --git a/tests/ahci-test.c b/tests/ahci-test.c
index b1a785c832..59d387c6d0 100644
--- a/tests/ahci-test.c
+++ b/tests/ahci-test.c
@@ -71,32 +71,6 @@ static void string_bswap16(uint16_t *s, size_t bytes)
     }
 }
 
-static void generate_pattern(void *buffer, size_t len, size_t cycle_len)
-{
-    int i, j;
-    unsigned char *tx = (unsigned char *)buffer;
-    unsigned char p;
-    size_t *sx;
-
-    /* Write an indicative pattern that varies and is unique per-cycle */
-    p = rand() % 256;
-    for (i = 0; i < len; i++) {
-        tx[i] = p++ % 256;
-        if (i % cycle_len == 0) {
-            p = rand() % 256;
-        }
-    }
-
-    /* force uniqueness by writing an id per-cycle */
-    for (i = 0; i < len / cycle_len; i++) {
-        j = i * cycle_len;
-        if (j + sizeof(*sx) <= len) {
-            sx = (size_t *)&tx[j];
-            *sx = i;
-        }
-    }
-}
-
 /**
  * Verify that the transfer did not corrupt our state at all.
  */
diff --git a/tests/libqos/libqos.c b/tests/libqos/libqos.c
index fce625b18a..8d7c5a9db8 100644
--- a/tests/libqos/libqos.c
+++ b/tests/libqos/libqos.c
@@ -212,3 +212,29 @@ void prepare_blkdebug_script(const char *debug_fn, const char *event)
     ret = fclose(debug_file);
     g_assert(ret == 0);
 }
+
+void generate_pattern(void *buffer, size_t len, size_t cycle_len)
+{
+    int i, j;
+    unsigned char *tx = (unsigned char *)buffer;
+    unsigned char p;
+    size_t *sx;
+
+    /* Write an indicative pattern that varies and is unique per-cycle */
+    p = rand() % 256;
+    for (i = 0; i < len; i++) {
+        tx[i] = p++ % 256;
+        if (i % cycle_len == 0) {
+            p = rand() % 256;
+        }
+    }
+
+    /* force uniqueness by writing an id per-cycle */
+    for (i = 0; i < len / cycle_len; i++) {
+        j = i * cycle_len;
+        if (j + sizeof(*sx) <= len) {
+            sx = (size_t *)&tx[j];
+            *sx = i;
+        }
+    }
+}
diff --git a/tests/libqos/libqos.h b/tests/libqos/libqos.h
index e1f14ea6fb..492a651f5b 100644
--- a/tests/libqos/libqos.h
+++ b/tests/libqos/libqos.h
@@ -24,6 +24,7 @@ void mkqcow2(const char *file, unsigned size_mb);
 void set_context(QOSState *s);
 void migrate(QOSState *from, QOSState *to, const char *uri);
 void prepare_blkdebug_script(const char *debug_fn, const char *event);
+void generate_pattern(void *buffer, size_t len, size_t cycle_len);
 
 static inline uint64_t qmalloc(QOSState *q, size_t bytes)
 {