for a backend change, a number of ioctls has to be replayed to sync
the current setup of a frontend to a backend tty. This is hopefully
enough so we don't have to track, store and replay the whole original
control byte sequence.
Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
CC: Michael S. Tsirkin <m...@redhat.com>
CC: Paolo Bonzini <pbonz...@redhat.com>
---
hw/char/serial.c | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/hw/char/serial.c b/hw/char/serial.c
index e47f0b6..9aec6c6 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -891,9 +891,37 @@ static void serial_reset(void *opaque)
s->msr &= ~UART_MSR_ANY_DELTA;
}
+static int serial_be_change(void *opaque)
+{
+ SerialState *s = opaque;
+
+ qemu_chr_fe_set_handlers(&s->chr, serial_can_receive1, serial_receive1,
+ serial_event, serial_be_change, s, NULL, true);
+
+ serial_update_parameters(s);
+
+ qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+ &s->last_break_enable);
+
+ s->poll_msl = (s->ier & UART_IER_MSI) ? 1 : 0;
+ serial_update_msl(s);
+
+ if (s->poll_msl >= 0 && !(s->mcr & UART_MCR_LOOP)) {
+ serial_update_tiocm(s);
+ }
+
+ if (s->watch_tag > 0) {
+ g_source_remove(s->watch_tag);
+ s->watch_tag = qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
+ serial_watch_cb, s);
+ }
+
+ return 0;
+}
+
void serial_realize_core(SerialState *s, Error **errp)
{
- if (!qemu_chr_fe_get_driver(&s->chr)) {
+ if (!qemu_chr_fe_backend_connected(&s->chr)) {
error_setg(errp, "Can't create serial device, empty char device");
return;
}
@@ -904,7 +932,7 @@ void serial_realize_core(SerialState *s, Error **errp)
qemu_register_reset(serial_reset, s);
qemu_chr_fe_set_handlers(&s->chr, serial_can_receive1, serial_receive1,
- serial_event, NULL, s, NULL, true);
+ serial_event, serial_be_change, s, NULL, true);
fifo8_create(&s->recv_fifo, UART_FIFO_LENGTH);
fifo8_create(&s->xmit_fifo, UART_FIFO_LENGTH);
serial_reset(s);
--
2.7.4
