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AM5PR0801MB1985; 20:2EqIM1FAKnksrFjvJnzYpbFa3vWwEDlWXwBkzEJdhnLb/be+hU2xtv8RFLONsa+IMB/fKziCfmeF8tSP9U8c312UUvRPoZFfd7fGfu1J5YLogAQIzCcoE8sBseIuY3zMZVRQ2EaMvA8Xjbfp3mUVIUjfwLQU5PQ36ZR6kfJnnxU= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jul 2017 12:10:41.2141 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0801MB1985 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.1.120 Subject: [Qemu-devel] [PATCH v6 13/13] serial: chardev hotswap support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anton Nefedov , den@virtuozzo.com, amit@kernel.org, mst@redhat.com, marcandre.lureau@redhat.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This allows to change the port's backend runtime, e.g. change it from file to a socket making it possible to establish a debug session with WinDbg > qemu-system [..] -chardev file,id=charchannel2,path=/tmp/charchannel2 \ -device isa-serial,chardev=charchannel2,id=channel2 QEMU 2.9.50 monitor - type 'help' for more information (qemu) chardev-change charchannel2 \ socket,host=127.0.0.1,port=4242,server,nowait 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 Reviewed-by: Vladimir Sementsov-Ogievskiy --- hw/char/serial.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/hw/char/serial.c b/hw/char/serial.c index 09157f9..9aec6c6 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -891,6 +891,34 @@ 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_backend_connected(&s->chr)) { @@ -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);