If a port was open before going into one of the sleep states, the port can continue normal operation after restore. However, the host has to be told that the guest side of the connection is open to restore pre-suspend state.
This wasn't noticed so far due to a bug in qemu that was fixed recently (which marked the guest-side connection as always open). CC: [email protected] # Only for 3.3 Signed-off-by: Amit Shah <[email protected]> --- drivers/char/virtio_console.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index ddf86b6..cdf2f54 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1895,6 +1895,13 @@ static int virtcons_restore(struct virtio_device *vdev) /* Get port open/close status on the host */ send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); + + /* + * If a port was open at the time of suspending, we + * have to let the host know that it's still open. + */ + if (port->guest_connected) + send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); } return 0; } -- 1.7.7.6 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
