[46/64] audio: Never send migration section

Commit Message

Michael Roth Oct. 19, 2021, 2:09 p.m. UTC

From: "Dr. David Alan Gilbert" <[e-mail]>

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 <[e-mail]>
Reviewed-by: Daniel P. Berrangé <[e-mail]>
Tested-by: Daniel P. Berrangé <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Gerd Hoffmann <[e-mail]>
(cherry picked from commit da77adbaf619c4d170cb42d769145ad1803fbad9)
Signed-off-by: Michael Roth <[e-mail]>
---
 audio/audio.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch

diff --git a/audio/audio.c b/audio/audio.c
index 534278edfe..fa724ea8e0 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1621,10 +1621,20 @@  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()
     }