[Qemu-devel] [PATCH 2/3] virtio-balloon: note optional features

[Paolo Bonzini <pbonzini@redhat.com>]

It is not a problem if the destination does not have
VIRTIO_BALLOON_F_MUST_TELL_HOST.  In that case, the guest
will simply do useless virtqueue traffic, but the destination
does not have a problem.

(In fact, it _is_ a problem if the destination has
VIRTIO_BALLOON_F_MUST_TELL_HOST but the source does not.
The feature bit should have been backwards!  Luckily,
our implementation is free from this problem).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/virtio-balloon.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index 0ade8b0..d10df2e 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -216,7 +216,7 @@ static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id != 1)
         return -EINVAL;
 
-    ret = virtio_load(&s->vdev, f, 0);
+    ret = virtio_load(&s->vdev, f, VIRTIO_BALLOON_F_MUST_TELL_HOST);
     if (ret) {
         return ret;
     }
-- 
1.7.7.6