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23797df3d9
* mjt/mjt-iov2: rewrite iov_send_recv() and move it to iov.c cleanup qemu_co_sendv(), qemu_co_recvv() and friends export iov_send_recv() and use it in iov_send() and iov_recv() rename qemu_sendv to iov_send, change proto and move declarations to iov.h change qemu_iovec_to_buf() to match other to,from_buf functions consolidate qemu_iovec_copy() and qemu_iovec_concat() and make them consistent allow qemu_iovec_from_buffer() to specify offset from which to start copying consolidate qemu_iovec_memset{,_skip}() into single function and use existing iov_memset() rewrite iov_* functions change iov_* function prototypes to be more appropriate virtio-serial-bus: use correct lengths in control_out() message Conflicts: tests/Makefile Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
1017 lines
28 KiB
C
1017 lines
28 KiB
C
/*
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* A bus for connecting virtio serial and console ports
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*
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* Copyright (C) 2009, 2010 Red Hat, Inc.
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*
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* Author(s):
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* Amit Shah <amit.shah@redhat.com>
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*
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* Some earlier parts are:
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* Copyright IBM, Corp. 2008
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* authored by
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* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "iov.h"
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#include "monitor.h"
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#include "qemu-queue.h"
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#include "sysbus.h"
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#include "trace.h"
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#include "virtio-serial.h"
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/* The virtio-serial bus on top of which the ports will ride as devices */
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struct VirtIOSerialBus {
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BusState qbus;
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/* This is the parent device that provides the bus for ports. */
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VirtIOSerial *vser;
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/* The maximum number of ports that can ride on top of this bus */
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uint32_t max_nr_ports;
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};
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struct VirtIOSerial {
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VirtIODevice vdev;
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VirtQueue *c_ivq, *c_ovq;
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/* Arrays of ivqs and ovqs: one per port */
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VirtQueue **ivqs, **ovqs;
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VirtIOSerialBus bus;
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DeviceState *qdev;
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QTAILQ_HEAD(, VirtIOSerialPort) ports;
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/* bitmap for identifying active ports */
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uint32_t *ports_map;
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struct virtio_console_config config;
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};
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static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
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{
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VirtIOSerialPort *port;
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if (id == VIRTIO_CONSOLE_BAD_ID) {
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return NULL;
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}
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QTAILQ_FOREACH(port, &vser->ports, next) {
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if (port->id == id)
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return port;
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}
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return NULL;
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}
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static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
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{
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VirtIOSerialPort *port;
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QTAILQ_FOREACH(port, &vser->ports, next) {
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if (port->ivq == vq || port->ovq == vq)
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return port;
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}
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return NULL;
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}
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static bool use_multiport(VirtIOSerial *vser)
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{
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return vser->vdev.guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
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}
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static size_t write_to_port(VirtIOSerialPort *port,
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const uint8_t *buf, size_t size)
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{
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VirtQueueElement elem;
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VirtQueue *vq;
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size_t offset;
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vq = port->ivq;
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if (!virtio_queue_ready(vq)) {
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return 0;
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}
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offset = 0;
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while (offset < size) {
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size_t len;
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if (!virtqueue_pop(vq, &elem)) {
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break;
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}
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len = iov_from_buf(elem.in_sg, elem.in_num, 0,
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buf + offset, size - offset);
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offset += len;
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virtqueue_push(vq, &elem, len);
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}
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virtio_notify(&port->vser->vdev, vq);
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return offset;
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}
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static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
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{
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VirtQueueElement elem;
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if (!virtio_queue_ready(vq)) {
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return;
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}
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while (virtqueue_pop(vq, &elem)) {
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virtqueue_push(vq, &elem, 0);
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}
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virtio_notify(vdev, vq);
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}
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static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
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VirtIODevice *vdev)
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{
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VirtIOSerialPortClass *vsc;
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assert(port);
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assert(virtio_queue_ready(vq));
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vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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while (!port->throttled) {
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unsigned int i;
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/* Pop an elem only if we haven't left off a previous one mid-way */
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if (!port->elem.out_num) {
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if (!virtqueue_pop(vq, &port->elem)) {
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break;
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}
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port->iov_idx = 0;
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port->iov_offset = 0;
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}
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for (i = port->iov_idx; i < port->elem.out_num; i++) {
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size_t buf_size;
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ssize_t ret;
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buf_size = port->elem.out_sg[i].iov_len - port->iov_offset;
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ret = vsc->have_data(port,
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port->elem.out_sg[i].iov_base
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+ port->iov_offset,
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buf_size);
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if (ret < 0 && ret != -EAGAIN) {
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/* We don't handle any other type of errors here */
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abort();
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}
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if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) {
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/*
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* this is a temporary check until chardevs can signal to
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* frontends that they are writable again. This prevents
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* the console from going into throttled mode (forever)
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* if virtio-console is connected to a pty without a
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* listener. Otherwise the guest spins forever.
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* We can revert this if
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* 1: chardevs can notify frondends
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* 2: the guest driver does not spin in these cases
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*/
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if (!vsc->is_console) {
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virtio_serial_throttle_port(port, true);
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}
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port->iov_idx = i;
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if (ret > 0) {
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port->iov_offset += ret;
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}
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break;
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}
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port->iov_offset = 0;
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}
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if (port->throttled) {
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break;
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}
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virtqueue_push(vq, &port->elem, 0);
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port->elem.out_num = 0;
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}
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virtio_notify(vdev, vq);
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}
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static void flush_queued_data(VirtIOSerialPort *port)
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{
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assert(port);
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if (!virtio_queue_ready(port->ovq)) {
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return;
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}
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do_flush_queued_data(port, port->ovq, &port->vser->vdev);
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}
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static size_t send_control_msg(VirtIOSerialPort *port, void *buf, size_t len)
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{
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VirtQueueElement elem;
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VirtQueue *vq;
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struct virtio_console_control *cpkt;
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vq = port->vser->c_ivq;
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if (!virtio_queue_ready(vq)) {
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return 0;
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}
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if (!virtqueue_pop(vq, &elem)) {
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return 0;
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}
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cpkt = (struct virtio_console_control *)buf;
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stl_p(&cpkt->id, port->id);
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memcpy(elem.in_sg[0].iov_base, buf, len);
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virtqueue_push(vq, &elem, len);
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virtio_notify(&port->vser->vdev, vq);
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return len;
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}
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static size_t send_control_event(VirtIOSerialPort *port, uint16_t event,
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uint16_t value)
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{
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struct virtio_console_control cpkt;
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stw_p(&cpkt.event, event);
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stw_p(&cpkt.value, value);
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trace_virtio_serial_send_control_event(port->id, event, value);
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return send_control_msg(port, &cpkt, sizeof(cpkt));
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}
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/* Functions for use inside qemu to open and read from/write to ports */
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int virtio_serial_open(VirtIOSerialPort *port)
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{
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/* Don't allow opening an already-open port */
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if (port->host_connected) {
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return 0;
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}
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/* Send port open notification to the guest */
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port->host_connected = true;
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send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
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return 0;
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}
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int virtio_serial_close(VirtIOSerialPort *port)
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{
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port->host_connected = false;
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/*
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* If there's any data the guest sent which the app didn't
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* consume, reset the throttling flag and discard the data.
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*/
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port->throttled = false;
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discard_vq_data(port->ovq, &port->vser->vdev);
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send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
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return 0;
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}
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/* Individual ports/apps call this function to write to the guest. */
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ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
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size_t size)
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{
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if (!port || !port->host_connected || !port->guest_connected) {
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return 0;
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}
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return write_to_port(port, buf, size);
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}
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/*
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* Readiness of the guest to accept data on a port.
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* Returns max. data the guest can receive
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*/
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size_t virtio_serial_guest_ready(VirtIOSerialPort *port)
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{
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VirtQueue *vq = port->ivq;
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if (!virtio_queue_ready(vq) ||
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!(port->vser->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
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virtio_queue_empty(vq)) {
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return 0;
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}
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if (use_multiport(port->vser) && !port->guest_connected) {
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return 0;
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}
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if (virtqueue_avail_bytes(vq, 4096, 0)) {
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return 4096;
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}
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if (virtqueue_avail_bytes(vq, 1, 0)) {
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return 1;
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}
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return 0;
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}
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static void flush_queued_data_bh(void *opaque)
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{
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VirtIOSerialPort *port = opaque;
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flush_queued_data(port);
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}
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void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle)
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{
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if (!port) {
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return;
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}
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trace_virtio_serial_throttle_port(port->id, throttle);
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port->throttled = throttle;
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if (throttle) {
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return;
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}
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qemu_bh_schedule(port->bh);
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}
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/* Guest wants to notify us of some event */
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static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
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{
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struct VirtIOSerialPort *port;
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VirtIOSerialPortClass *vsc;
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struct virtio_console_control cpkt, *gcpkt;
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uint8_t *buffer;
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size_t buffer_len;
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gcpkt = buf;
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if (len < sizeof(cpkt)) {
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/* The guest sent an invalid control packet */
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return;
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}
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cpkt.event = lduw_p(&gcpkt->event);
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cpkt.value = lduw_p(&gcpkt->value);
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trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value);
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if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
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if (!cpkt.value) {
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error_report("virtio-serial-bus: Guest failure in adding device %s",
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vser->bus.qbus.name);
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return;
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}
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/*
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* The device is up, we can now tell the device about all the
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* ports we have here.
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*/
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QTAILQ_FOREACH(port, &vser->ports, next) {
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send_control_event(port, VIRTIO_CONSOLE_PORT_ADD, 1);
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}
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return;
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}
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port = find_port_by_id(vser, ldl_p(&gcpkt->id));
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if (!port) {
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error_report("virtio-serial-bus: Unexpected port id %u for device %s",
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ldl_p(&gcpkt->id), vser->bus.qbus.name);
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return;
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}
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trace_virtio_serial_handle_control_message_port(port->id);
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vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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switch(cpkt.event) {
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case VIRTIO_CONSOLE_PORT_READY:
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if (!cpkt.value) {
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error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
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port->id, vser->bus.qbus.name);
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break;
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}
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/*
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* Now that we know the guest asked for the port name, we're
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* sure the guest has initialised whatever state is necessary
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* for this port. Now's a good time to let the guest know if
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* this port is a console port so that the guest can hook it
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* up to hvc.
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*/
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if (vsc->is_console) {
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send_control_event(port, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
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}
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if (port->name) {
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stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
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stw_p(&cpkt.value, 1);
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buffer_len = sizeof(cpkt) + strlen(port->name) + 1;
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buffer = g_malloc(buffer_len);
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memcpy(buffer, &cpkt, sizeof(cpkt));
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memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
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buffer[buffer_len - 1] = 0;
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send_control_msg(port, buffer, buffer_len);
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g_free(buffer);
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}
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if (port->host_connected) {
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send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
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}
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/*
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* When the guest has asked us for this information it means
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* the guest is all setup and has its virtqueues
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* initialised. If some app is interested in knowing about
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* this event, let it know.
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*/
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if (vsc->guest_ready) {
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vsc->guest_ready(port);
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}
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break;
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case VIRTIO_CONSOLE_PORT_OPEN:
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port->guest_connected = cpkt.value;
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if (cpkt.value && vsc->guest_open) {
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/* Send the guest opened notification if an app is interested */
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vsc->guest_open(port);
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}
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if (!cpkt.value && vsc->guest_close) {
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/* Send the guest closed notification if an app is interested */
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vsc->guest_close(port);
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}
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break;
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}
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}
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static void control_in(VirtIODevice *vdev, VirtQueue *vq)
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{
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}
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static void control_out(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtQueueElement elem;
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VirtIOSerial *vser;
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uint8_t *buf;
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size_t len;
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vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
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len = 0;
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buf = NULL;
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while (virtqueue_pop(vq, &elem)) {
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size_t cur_len;
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cur_len = iov_size(elem.out_sg, elem.out_num);
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/*
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* Allocate a new buf only if we didn't have one previously or
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* if the size of the buf differs
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*/
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if (cur_len > len) {
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g_free(buf);
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buf = g_malloc(cur_len);
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len = cur_len;
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}
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iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
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handle_control_message(vser, buf, cur_len);
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virtqueue_push(vq, &elem, 0);
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}
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g_free(buf);
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virtio_notify(vdev, vq);
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}
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/* Guest wrote something to some port. */
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static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIOSerial *vser;
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VirtIOSerialPort *port;
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vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
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port = find_port_by_vq(vser, vq);
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if (!port || !port->host_connected) {
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discard_vq_data(vq, vdev);
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return;
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}
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if (!port->throttled) {
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do_flush_queued_data(port, vq, vdev);
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return;
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}
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}
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static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
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{
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}
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static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
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{
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VirtIOSerial *vser;
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vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
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if (vser->bus.max_nr_ports > 1) {
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features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
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}
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return features;
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}
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|
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/* Guest requested config info */
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static void get_config(VirtIODevice *vdev, uint8_t *config_data)
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{
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VirtIOSerial *vser;
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|
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
|
|
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config));
|
|
}
|
|
|
|
static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
|
|
{
|
|
struct virtio_console_config config;
|
|
|
|
memcpy(&config, config_data, sizeof(config));
|
|
}
|
|
|
|
static void guest_reset(VirtIOSerial *vser)
|
|
{
|
|
VirtIOSerialPort *port;
|
|
VirtIOSerialPortClass *vsc;
|
|
|
|
QTAILQ_FOREACH(port, &vser->ports, next) {
|
|
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
if (port->guest_connected) {
|
|
port->guest_connected = false;
|
|
|
|
if (vsc->guest_close)
|
|
vsc->guest_close(port);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void set_status(VirtIODevice *vdev, uint8_t status)
|
|
{
|
|
VirtIOSerial *vser;
|
|
VirtIOSerialPort *port;
|
|
|
|
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
|
|
port = find_port_by_id(vser, 0);
|
|
|
|
if (port && !use_multiport(port->vser)
|
|
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
/*
|
|
* Non-multiport guests won't be able to tell us guest
|
|
* open/close status. Such guests can only have a port at id
|
|
* 0, so set guest_connected for such ports as soon as guest
|
|
* is up.
|
|
*/
|
|
port->guest_connected = true;
|
|
}
|
|
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
guest_reset(vser);
|
|
}
|
|
}
|
|
|
|
static void vser_reset(VirtIODevice *vdev)
|
|
{
|
|
VirtIOSerial *vser;
|
|
|
|
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
|
|
guest_reset(vser);
|
|
}
|
|
|
|
static void virtio_serial_save(QEMUFile *f, void *opaque)
|
|
{
|
|
VirtIOSerial *s = opaque;
|
|
VirtIOSerialPort *port;
|
|
uint32_t nr_active_ports;
|
|
unsigned int i, max_nr_ports;
|
|
|
|
/* The virtio device */
|
|
virtio_save(&s->vdev, f);
|
|
|
|
/* The config space */
|
|
qemu_put_be16s(f, &s->config.cols);
|
|
qemu_put_be16s(f, &s->config.rows);
|
|
|
|
qemu_put_be32s(f, &s->config.max_nr_ports);
|
|
|
|
/* The ports map */
|
|
max_nr_ports = tswap32(s->config.max_nr_ports);
|
|
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
|
|
qemu_put_be32s(f, &s->ports_map[i]);
|
|
}
|
|
|
|
/* Ports */
|
|
|
|
nr_active_ports = 0;
|
|
QTAILQ_FOREACH(port, &s->ports, next) {
|
|
nr_active_ports++;
|
|
}
|
|
|
|
qemu_put_be32s(f, &nr_active_ports);
|
|
|
|
/*
|
|
* Items in struct VirtIOSerialPort.
|
|
*/
|
|
QTAILQ_FOREACH(port, &s->ports, next) {
|
|
uint32_t elem_popped;
|
|
|
|
qemu_put_be32s(f, &port->id);
|
|
qemu_put_byte(f, port->guest_connected);
|
|
qemu_put_byte(f, port->host_connected);
|
|
|
|
elem_popped = 0;
|
|
if (port->elem.out_num) {
|
|
elem_popped = 1;
|
|
}
|
|
qemu_put_be32s(f, &elem_popped);
|
|
if (elem_popped) {
|
|
qemu_put_be32s(f, &port->iov_idx);
|
|
qemu_put_be64s(f, &port->iov_offset);
|
|
|
|
qemu_put_buffer(f, (unsigned char *)&port->elem,
|
|
sizeof(port->elem));
|
|
}
|
|
}
|
|
}
|
|
|
|
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
VirtIOSerial *s = opaque;
|
|
VirtIOSerialPort *port;
|
|
uint32_t max_nr_ports, nr_active_ports, ports_map;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (version_id > 3) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* The virtio device */
|
|
ret = virtio_load(&s->vdev, f);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (version_id < 2) {
|
|
return 0;
|
|
}
|
|
|
|
/* The config space */
|
|
qemu_get_be16s(f, &s->config.cols);
|
|
qemu_get_be16s(f, &s->config.rows);
|
|
|
|
qemu_get_be32s(f, &max_nr_ports);
|
|
tswap32s(&max_nr_ports);
|
|
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
|
|
/* Source could have had more ports than us. Fail migration. */
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
|
|
qemu_get_be32s(f, &ports_map);
|
|
|
|
if (ports_map != s->ports_map[i]) {
|
|
/*
|
|
* Ports active on source and destination don't
|
|
* match. Fail migration.
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
qemu_get_be32s(f, &nr_active_ports);
|
|
|
|
/* Items in struct VirtIOSerialPort */
|
|
for (i = 0; i < nr_active_ports; i++) {
|
|
uint32_t id;
|
|
bool host_connected;
|
|
|
|
id = qemu_get_be32(f);
|
|
port = find_port_by_id(s, id);
|
|
if (!port) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
port->guest_connected = qemu_get_byte(f);
|
|
host_connected = qemu_get_byte(f);
|
|
if (host_connected != port->host_connected) {
|
|
/*
|
|
* We have to let the guest know of the host connection
|
|
* status change
|
|
*/
|
|
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN,
|
|
port->host_connected);
|
|
}
|
|
|
|
if (version_id > 2) {
|
|
uint32_t elem_popped;
|
|
|
|
qemu_get_be32s(f, &elem_popped);
|
|
if (elem_popped) {
|
|
qemu_get_be32s(f, &port->iov_idx);
|
|
qemu_get_be64s(f, &port->iov_offset);
|
|
|
|
qemu_get_buffer(f, (unsigned char *)&port->elem,
|
|
sizeof(port->elem));
|
|
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr,
|
|
port->elem.in_num, 1);
|
|
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr,
|
|
port->elem.out_num, 1);
|
|
|
|
/*
|
|
* Port was throttled on source machine. Let's
|
|
* unthrottle it here so data starts flowing again.
|
|
*/
|
|
virtio_serial_throttle_port(port, false);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
|
|
|
|
static Property virtser_props[] = {
|
|
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
|
|
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
|
|
DEFINE_PROP_END_OF_LIST()
|
|
};
|
|
|
|
#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus"
|
|
#define VIRTIO_SERIAL_BUS(obj) \
|
|
OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS)
|
|
|
|
static void virtser_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *k = BUS_CLASS(klass);
|
|
k->print_dev = virtser_bus_dev_print;
|
|
}
|
|
|
|
static const TypeInfo virtser_bus_info = {
|
|
.name = TYPE_VIRTIO_SERIAL_BUS,
|
|
.parent = TYPE_BUS,
|
|
.instance_size = sizeof(VirtIOSerialBus),
|
|
.class_init = virtser_bus_class_init,
|
|
};
|
|
|
|
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
|
|
{
|
|
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
|
|
|
|
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
|
|
indent, "", port->id,
|
|
port->guest_connected ? "on" : "off",
|
|
port->host_connected ? "on" : "off",
|
|
port->throttled ? "on" : "off");
|
|
}
|
|
|
|
/* This function is only used if a port id is not provided by the user */
|
|
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
|
{
|
|
unsigned int i, max_nr_ports;
|
|
|
|
max_nr_ports = tswap32(vser->config.max_nr_ports);
|
|
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
|
|
uint32_t map, bit;
|
|
|
|
map = vser->ports_map[i];
|
|
bit = ffs(~map);
|
|
if (bit) {
|
|
return (bit - 1) + i * 32;
|
|
}
|
|
}
|
|
return VIRTIO_CONSOLE_BAD_ID;
|
|
}
|
|
|
|
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
|
|
{
|
|
unsigned int i;
|
|
|
|
i = port_id / 32;
|
|
vser->ports_map[i] |= 1U << (port_id % 32);
|
|
}
|
|
|
|
static void add_port(VirtIOSerial *vser, uint32_t port_id)
|
|
{
|
|
mark_port_added(vser, port_id);
|
|
|
|
send_control_event(find_port_by_id(vser, port_id),
|
|
VIRTIO_CONSOLE_PORT_ADD, 1);
|
|
}
|
|
|
|
static void remove_port(VirtIOSerial *vser, uint32_t port_id)
|
|
{
|
|
VirtIOSerialPort *port;
|
|
unsigned int i;
|
|
|
|
i = port_id / 32;
|
|
vser->ports_map[i] &= ~(1U << (port_id % 32));
|
|
|
|
port = find_port_by_id(vser, port_id);
|
|
/* Flush out any unconsumed buffers first */
|
|
discard_vq_data(port->ovq, &port->vser->vdev);
|
|
|
|
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
|
}
|
|
|
|
static int virtser_port_qdev_init(DeviceState *qdev)
|
|
{
|
|
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
|
|
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus);
|
|
int ret, max_nr_ports;
|
|
bool plugging_port0;
|
|
|
|
port->vser = bus->vser;
|
|
port->bh = qemu_bh_new(flush_queued_data_bh, port);
|
|
|
|
assert(vsc->have_data);
|
|
|
|
/*
|
|
* Is the first console port we're seeing? If so, put it up at
|
|
* location 0. This is done for backward compatibility (old
|
|
* kernel, new qemu).
|
|
*/
|
|
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
|
|
|
|
if (find_port_by_id(port->vser, port->id)) {
|
|
error_report("virtio-serial-bus: A port already exists at id %u",
|
|
port->id);
|
|
return -1;
|
|
}
|
|
|
|
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
|
if (plugging_port0) {
|
|
port->id = 0;
|
|
} else {
|
|
port->id = find_free_port_id(port->vser);
|
|
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
|
error_report("virtio-serial-bus: Maximum port limit for this device reached");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
max_nr_ports = tswap32(port->vser->config.max_nr_ports);
|
|
if (port->id >= max_nr_ports) {
|
|
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
|
|
max_nr_ports - 1);
|
|
return -1;
|
|
}
|
|
|
|
ret = vsc->init(port);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
port->elem.out_num = 0;
|
|
|
|
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
|
|
port->ivq = port->vser->ivqs[port->id];
|
|
port->ovq = port->vser->ovqs[port->id];
|
|
|
|
add_port(port->vser, port->id);
|
|
|
|
/* Send an update to the guest about this new port added */
|
|
virtio_notify_config(&port->vser->vdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int virtser_port_qdev_exit(DeviceState *qdev)
|
|
{
|
|
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
|
|
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
VirtIOSerial *vser = port->vser;
|
|
|
|
qemu_bh_delete(port->bh);
|
|
remove_port(port->vser, port->id);
|
|
|
|
QTAILQ_REMOVE(&vser->ports, port, next);
|
|
|
|
if (vsc->exit) {
|
|
vsc->exit(port);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
|
|
{
|
|
VirtIOSerial *vser;
|
|
VirtIODevice *vdev;
|
|
uint32_t i, max_supported_ports;
|
|
|
|
if (!conf->max_virtserial_ports)
|
|
return NULL;
|
|
|
|
/* Each port takes 2 queues, and one pair is for the control queue */
|
|
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1;
|
|
|
|
if (conf->max_virtserial_ports > max_supported_ports) {
|
|
error_report("maximum ports supported: %u", max_supported_ports);
|
|
return NULL;
|
|
}
|
|
|
|
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
|
|
sizeof(struct virtio_console_config),
|
|
sizeof(VirtIOSerial));
|
|
|
|
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
|
|
|
|
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
|
qbus_create_inplace(&vser->bus.qbus, TYPE_VIRTIO_SERIAL_BUS, dev, NULL);
|
|
vser->bus.qbus.allow_hotplug = 1;
|
|
vser->bus.vser = vser;
|
|
QTAILQ_INIT(&vser->ports);
|
|
|
|
vser->bus.max_nr_ports = conf->max_virtserial_ports;
|
|
vser->ivqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
|
vser->ovqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
|
|
|
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
|
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input);
|
|
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
|
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output);
|
|
|
|
/* TODO: host to guest notifications can get dropped
|
|
* if the queue fills up. Implement queueing in host,
|
|
* this might also make it possible to reduce the control
|
|
* queue size: as guest preposts buffers there,
|
|
* this will save 4Kbyte of guest memory per entry. */
|
|
|
|
/* control queue: host to guest */
|
|
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
|
/* control queue: guest to host */
|
|
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
|
|
|
for (i = 1; i < vser->bus.max_nr_ports; i++) {
|
|
/* Add a per-port queue for host to guest transfers */
|
|
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
|
/* Add a per-per queue for guest to host transfers */
|
|
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
|
}
|
|
|
|
vser->config.max_nr_ports = tswap32(conf->max_virtserial_ports);
|
|
vser->ports_map = g_malloc0(((conf->max_virtserial_ports + 31) / 32)
|
|
* sizeof(vser->ports_map[0]));
|
|
/*
|
|
* Reserve location 0 for a console port for backward compat
|
|
* (old kernel, new qemu)
|
|
*/
|
|
mark_port_added(vser, 0);
|
|
|
|
vser->vdev.get_features = get_features;
|
|
vser->vdev.get_config = get_config;
|
|
vser->vdev.set_config = set_config;
|
|
vser->vdev.set_status = set_status;
|
|
vser->vdev.reset = vser_reset;
|
|
|
|
vser->qdev = dev;
|
|
|
|
/*
|
|
* Register for the savevm section with the virtio-console name
|
|
* to preserve backward compat
|
|
*/
|
|
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save,
|
|
virtio_serial_load, vser);
|
|
|
|
return vdev;
|
|
}
|
|
|
|
void virtio_serial_exit(VirtIODevice *vdev)
|
|
{
|
|
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
|
|
|
|
unregister_savevm(vser->qdev, "virtio-console", vser);
|
|
|
|
g_free(vser->ivqs);
|
|
g_free(vser->ovqs);
|
|
g_free(vser->ports_map);
|
|
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void virtio_serial_port_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *k = DEVICE_CLASS(klass);
|
|
k->init = virtser_port_qdev_init;
|
|
k->bus_type = TYPE_VIRTIO_SERIAL_BUS;
|
|
k->exit = virtser_port_qdev_exit;
|
|
k->unplug = qdev_simple_unplug_cb;
|
|
k->props = virtser_props;
|
|
}
|
|
|
|
static TypeInfo virtio_serial_port_type_info = {
|
|
.name = TYPE_VIRTIO_SERIAL_PORT,
|
|
.parent = TYPE_DEVICE,
|
|
.instance_size = sizeof(VirtIOSerialPort),
|
|
.abstract = true,
|
|
.class_size = sizeof(VirtIOSerialPortClass),
|
|
.class_init = virtio_serial_port_class_init,
|
|
};
|
|
|
|
static void virtio_serial_register_types(void)
|
|
{
|
|
type_register_static(&virtser_bus_info);
|
|
type_register_static(&virtio_serial_port_type_info);
|
|
}
|
|
|
|
type_init(virtio_serial_register_types)
|