audio: Never send migration section

The audio migration vmstate is empty, and always has been; we can't just remove it though because an old qemu might send it us. Changes with -audiodev now mean it's sometimes created when it didn't used to be, and can confuse migration to old qemu. Change it so that vmstate_audio is never sent; if it's received it should still be accepted, and old qemu's shouldn't be too upset if it's missing. Signed-off-by: Dr. David Alan Gilbert <[email protected]> Reviewed-by: Daniel P. Berrangé <[email protected]> Tested-by: Daniel P. Berrangé <[email protected]> Message-Id: <[email protected]> Signed-off-by: Gerd Hoffmann <[email protected]>
cube0x8 · Aug 10, 2021 · da77adb · da77adb
1 parent 7bce330
commit da77adb
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/audio/audio.c b/audio/audio.c
@@ -1622,10 +1622,20 @@ void audio_cleanup(void)
     }
 }
 
+static bool vmstate_audio_needed(void *opaque)
+{
+    /*
+     * Never needed, this vmstate only exists in case
+     * an old qemu sends it to us.
+     */
+    return false;
+}
+
 static const VMStateDescription vmstate_audio = {
     .name = "audio",
     .version_id = 1,
     .minimum_version_id = 1,
+    .needed = vmstate_audio_needed,
     .fields = (VMStateField[]) {
         VMSTATE_END_OF_LIST()
     }