----- "Amit Shah" <amit.s...@redhat.com> wrote:
> If a virtio-serial port is removed before the guest comes up and
> initialises the virtqueues, qemu exits with the message
>
> Guest moved used index from 0 to 61440
>
> This happens because we try to clear any pending buffers from the
> virtqueue.
>
> Ensure the virtqueue is initialised before calling any virtqueue
> operations.
>
> Signed-off-by: Amit Shah <amit.s...@redhat.com>
> ---
> hw/virtio-serial-bus.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
> index 7f9d28f..b89daa6 100644
> --- a/hw/virtio-serial-bus.c
> +++ b/hw/virtio-serial-bus.c
> @@ -139,6 +139,9 @@ static void flush_queued_data(VirtIOSerialPort
> *port, bool discard)
> {
> assert(port);
>
> + if (!virtio_queue_ready(port->ovq)) {
> + return;
> + }
> do_flush_queued_data(port, port->ovq, &port->vser->vdev,
> discard);
> }
>
> --
> 1.7.0.1
ACK series
