diff options
| -rw-r--r-- | hw/virtio-serial-bus.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c index fe0233f6f1..3a9004a9b8 100644 --- a/hw/virtio-serial-bus.c +++ b/hw/virtio-serial-bus.c @@ -163,7 +163,19 @@ static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, abort(); } if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) { - virtio_serial_throttle_port(port, true); + /* + * this is a temporary check until chardevs can signal to + * frontends that they are writable again. This prevents + * the console from going into throttled mode (forever) + * if virtio-console is connected to a pty without a + * listener. Otherwise the guest spins forever. + * We can revert this if + * 1: chardevs can notify frondends + * 2: the guest driver does not spin in these cases + */ + if (!info->is_console) { + virtio_serial_throttle_port(port, true); + } port->iov_idx = i; if (ret > 0) { port->iov_offset += ret; |