root / hw / virtio-serial-bus.c @ 7830cf78
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/*
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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 "qemu/iov.h" |
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#include "monitor/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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typedef struct VirtIOSerialPostLoad { |
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QEMUTimer *timer; |
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uint32_t nr_active_ports; |
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struct {
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VirtIOSerialPort *port; |
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uint8_t host_connected; |
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} *connected; |
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} VirtIOSerialPostLoad; |
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struct VirtIOSerial {
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VirtIODevice vdev; |
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|
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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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struct VirtIOSerialPostLoad *post_load;
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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 (port->throttled) {
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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(VirtIOSerial *vser, 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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vq = 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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memcpy(elem.in_sg[0].iov_base, buf, len);
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virtqueue_push(vq, &elem, len); |
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virtio_notify(&vser->vdev, vq); |
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return len;
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} |
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static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
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uint16_t event, uint16_t value) |
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{
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struct virtio_console_control cpkt;
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stl_p(&cpkt.id, port_id); |
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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(vser, &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->vser, port->id, 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->vser, port->id, 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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unsigned int bytes; |
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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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virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0); |
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return bytes;
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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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|
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trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); |
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|
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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(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
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} |
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return;
|
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} |
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|
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port = find_port_by_id(vser, ldl_p(&gcpkt->id)); |
| 355 |
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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} |
| 360 |
|
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trace_virtio_serial_handle_control_message_port(port->id); |
| 362 |
|
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vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 364 |
|
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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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*/
|
| 379 |
if (vsc->is_console) {
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send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
|
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} |
| 382 |
|
| 383 |
if (port->name) {
|
| 384 |
stl_p(&cpkt.id, port->id); |
| 385 |
stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME); |
| 386 |
stw_p(&cpkt.value, 1);
|
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|
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buffer_len = sizeof(cpkt) + strlen(port->name) + 1; |
| 389 |
buffer = g_malloc(buffer_len); |
| 390 |
|
| 391 |
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; |
| 394 |
|
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send_control_msg(vser, buffer, buffer_len); |
| 396 |
g_free(buffer); |
| 397 |
} |
| 398 |
|
| 399 |
if (port->host_connected) {
|
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send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
|
| 401 |
} |
| 402 |
|
| 403 |
/*
|
| 404 |
* When the guest has asked us for this information it means
|
| 405 |
* the guest is all setup and has its virtqueues
|
| 406 |
* initialised. If some app is interested in knowing about
|
| 407 |
* this event, let it know.
|
| 408 |
*/
|
| 409 |
if (vsc->guest_ready) {
|
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vsc->guest_ready(port); |
| 411 |
} |
| 412 |
break;
|
| 413 |
|
| 414 |
case VIRTIO_CONSOLE_PORT_OPEN:
|
| 415 |
port->guest_connected = cpkt.value; |
| 416 |
if (cpkt.value && vsc->guest_open) {
|
| 417 |
/* Send the guest opened notification if an app is interested */
|
| 418 |
vsc->guest_open(port); |
| 419 |
} |
| 420 |
|
| 421 |
if (!cpkt.value && vsc->guest_close) {
|
| 422 |
/* Send the guest closed notification if an app is interested */
|
| 423 |
vsc->guest_close(port); |
| 424 |
} |
| 425 |
break;
|
| 426 |
} |
| 427 |
} |
| 428 |
|
| 429 |
static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
| 430 |
{
|
| 431 |
} |
| 432 |
|
| 433 |
static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
| 434 |
{
|
| 435 |
VirtQueueElement elem; |
| 436 |
VirtIOSerial *vser; |
| 437 |
uint8_t *buf; |
| 438 |
size_t len; |
| 439 |
|
| 440 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 441 |
|
| 442 |
len = 0;
|
| 443 |
buf = NULL;
|
| 444 |
while (virtqueue_pop(vq, &elem)) {
|
| 445 |
size_t cur_len; |
| 446 |
|
| 447 |
cur_len = iov_size(elem.out_sg, elem.out_num); |
| 448 |
/*
|
| 449 |
* Allocate a new buf only if we didn't have one previously or
|
| 450 |
* if the size of the buf differs
|
| 451 |
*/
|
| 452 |
if (cur_len > len) {
|
| 453 |
g_free(buf); |
| 454 |
|
| 455 |
buf = g_malloc(cur_len); |
| 456 |
len = cur_len; |
| 457 |
} |
| 458 |
iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
|
| 459 |
|
| 460 |
handle_control_message(vser, buf, cur_len); |
| 461 |
virtqueue_push(vq, &elem, 0);
|
| 462 |
} |
| 463 |
g_free(buf); |
| 464 |
virtio_notify(vdev, vq); |
| 465 |
} |
| 466 |
|
| 467 |
/* Guest wrote something to some port. */
|
| 468 |
static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
| 469 |
{
|
| 470 |
VirtIOSerial *vser; |
| 471 |
VirtIOSerialPort *port; |
| 472 |
|
| 473 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 474 |
port = find_port_by_vq(vser, vq); |
| 475 |
|
| 476 |
if (!port || !port->host_connected) {
|
| 477 |
discard_vq_data(vq, vdev); |
| 478 |
return;
|
| 479 |
} |
| 480 |
|
| 481 |
if (!port->throttled) {
|
| 482 |
do_flush_queued_data(port, vq, vdev); |
| 483 |
return;
|
| 484 |
} |
| 485 |
} |
| 486 |
|
| 487 |
static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
| 488 |
{
|
| 489 |
} |
| 490 |
|
| 491 |
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
|
| 492 |
{
|
| 493 |
VirtIOSerial *vser; |
| 494 |
|
| 495 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 496 |
|
| 497 |
if (vser->bus.max_nr_ports > 1) { |
| 498 |
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
|
| 499 |
} |
| 500 |
return features;
|
| 501 |
} |
| 502 |
|
| 503 |
/* Guest requested config info */
|
| 504 |
static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
| 505 |
{
|
| 506 |
VirtIOSerial *vser; |
| 507 |
|
| 508 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 509 |
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config)); |
| 510 |
} |
| 511 |
|
| 512 |
static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
| 513 |
{
|
| 514 |
struct virtio_console_config config;
|
| 515 |
|
| 516 |
memcpy(&config, config_data, sizeof(config));
|
| 517 |
} |
| 518 |
|
| 519 |
static void guest_reset(VirtIOSerial *vser) |
| 520 |
{
|
| 521 |
VirtIOSerialPort *port; |
| 522 |
VirtIOSerialPortClass *vsc; |
| 523 |
|
| 524 |
QTAILQ_FOREACH(port, &vser->ports, next) {
|
| 525 |
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 526 |
if (port->guest_connected) {
|
| 527 |
port->guest_connected = false;
|
| 528 |
|
| 529 |
if (vsc->guest_close)
|
| 530 |
vsc->guest_close(port); |
| 531 |
} |
| 532 |
} |
| 533 |
} |
| 534 |
|
| 535 |
static void set_status(VirtIODevice *vdev, uint8_t status) |
| 536 |
{
|
| 537 |
VirtIOSerial *vser; |
| 538 |
VirtIOSerialPort *port; |
| 539 |
|
| 540 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 541 |
port = find_port_by_id(vser, 0);
|
| 542 |
|
| 543 |
if (port && !use_multiport(port->vser)
|
| 544 |
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 545 |
/*
|
| 546 |
* Non-multiport guests won't be able to tell us guest
|
| 547 |
* open/close status. Such guests can only have a port at id
|
| 548 |
* 0, so set guest_connected for such ports as soon as guest
|
| 549 |
* is up.
|
| 550 |
*/
|
| 551 |
port->guest_connected = true;
|
| 552 |
} |
| 553 |
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 554 |
guest_reset(vser); |
| 555 |
} |
| 556 |
} |
| 557 |
|
| 558 |
static void vser_reset(VirtIODevice *vdev) |
| 559 |
{
|
| 560 |
VirtIOSerial *vser; |
| 561 |
|
| 562 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 563 |
guest_reset(vser); |
| 564 |
} |
| 565 |
|
| 566 |
static void virtio_serial_save(QEMUFile *f, void *opaque) |
| 567 |
{
|
| 568 |
VirtIOSerial *s = opaque; |
| 569 |
VirtIOSerialPort *port; |
| 570 |
uint32_t nr_active_ports; |
| 571 |
unsigned int i, max_nr_ports; |
| 572 |
|
| 573 |
/* The virtio device */
|
| 574 |
virtio_save(&s->vdev, f); |
| 575 |
|
| 576 |
/* The config space */
|
| 577 |
qemu_put_be16s(f, &s->config.cols); |
| 578 |
qemu_put_be16s(f, &s->config.rows); |
| 579 |
|
| 580 |
qemu_put_be32s(f, &s->config.max_nr_ports); |
| 581 |
|
| 582 |
/* The ports map */
|
| 583 |
max_nr_ports = tswap32(s->config.max_nr_ports); |
| 584 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
| 585 |
qemu_put_be32s(f, &s->ports_map[i]); |
| 586 |
} |
| 587 |
|
| 588 |
/* Ports */
|
| 589 |
|
| 590 |
nr_active_ports = 0;
|
| 591 |
QTAILQ_FOREACH(port, &s->ports, next) {
|
| 592 |
nr_active_ports++; |
| 593 |
} |
| 594 |
|
| 595 |
qemu_put_be32s(f, &nr_active_ports); |
| 596 |
|
| 597 |
/*
|
| 598 |
* Items in struct VirtIOSerialPort.
|
| 599 |
*/
|
| 600 |
QTAILQ_FOREACH(port, &s->ports, next) {
|
| 601 |
uint32_t elem_popped; |
| 602 |
|
| 603 |
qemu_put_be32s(f, &port->id); |
| 604 |
qemu_put_byte(f, port->guest_connected); |
| 605 |
qemu_put_byte(f, port->host_connected); |
| 606 |
|
| 607 |
elem_popped = 0;
|
| 608 |
if (port->elem.out_num) {
|
| 609 |
elem_popped = 1;
|
| 610 |
} |
| 611 |
qemu_put_be32s(f, &elem_popped); |
| 612 |
if (elem_popped) {
|
| 613 |
qemu_put_be32s(f, &port->iov_idx); |
| 614 |
qemu_put_be64s(f, &port->iov_offset); |
| 615 |
|
| 616 |
qemu_put_buffer(f, (unsigned char *)&port->elem, |
| 617 |
sizeof(port->elem));
|
| 618 |
} |
| 619 |
} |
| 620 |
} |
| 621 |
|
| 622 |
static void virtio_serial_post_load_timer_cb(void *opaque) |
| 623 |
{
|
| 624 |
uint32_t i; |
| 625 |
VirtIOSerial *s = opaque; |
| 626 |
VirtIOSerialPort *port; |
| 627 |
uint8_t host_connected; |
| 628 |
|
| 629 |
if (!s->post_load) {
|
| 630 |
return;
|
| 631 |
} |
| 632 |
for (i = 0 ; i < s->post_load->nr_active_ports; ++i) { |
| 633 |
port = s->post_load->connected[i].port; |
| 634 |
host_connected = s->post_load->connected[i].host_connected; |
| 635 |
if (host_connected != port->host_connected) {
|
| 636 |
/*
|
| 637 |
* We have to let the guest know of the host connection
|
| 638 |
* status change
|
| 639 |
*/
|
| 640 |
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN, |
| 641 |
port->host_connected); |
| 642 |
} |
| 643 |
} |
| 644 |
g_free(s->post_load->connected); |
| 645 |
qemu_free_timer(s->post_load->timer); |
| 646 |
g_free(s->post_load); |
| 647 |
s->post_load = NULL;
|
| 648 |
} |
| 649 |
|
| 650 |
static int fetch_active_ports_list(QEMUFile *f, int version_id, |
| 651 |
VirtIOSerial *s, uint32_t nr_active_ports) |
| 652 |
{
|
| 653 |
uint32_t i; |
| 654 |
|
| 655 |
s->post_load = g_malloc0(sizeof(*s->post_load));
|
| 656 |
s->post_load->nr_active_ports = nr_active_ports; |
| 657 |
s->post_load->connected = |
| 658 |
g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
|
| 659 |
|
| 660 |
s->post_load->timer = qemu_new_timer_ns(vm_clock, |
| 661 |
virtio_serial_post_load_timer_cb, |
| 662 |
s); |
| 663 |
|
| 664 |
/* Items in struct VirtIOSerialPort */
|
| 665 |
for (i = 0; i < nr_active_ports; i++) { |
| 666 |
VirtIOSerialPort *port; |
| 667 |
uint32_t id; |
| 668 |
|
| 669 |
id = qemu_get_be32(f); |
| 670 |
port = find_port_by_id(s, id); |
| 671 |
if (!port) {
|
| 672 |
return -EINVAL;
|
| 673 |
} |
| 674 |
|
| 675 |
port->guest_connected = qemu_get_byte(f); |
| 676 |
s->post_load->connected[i].port = port; |
| 677 |
s->post_load->connected[i].host_connected = qemu_get_byte(f); |
| 678 |
|
| 679 |
if (version_id > 2) { |
| 680 |
uint32_t elem_popped; |
| 681 |
|
| 682 |
qemu_get_be32s(f, &elem_popped); |
| 683 |
if (elem_popped) {
|
| 684 |
qemu_get_be32s(f, &port->iov_idx); |
| 685 |
qemu_get_be64s(f, &port->iov_offset); |
| 686 |
|
| 687 |
qemu_get_buffer(f, (unsigned char *)&port->elem, |
| 688 |
sizeof(port->elem));
|
| 689 |
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr, |
| 690 |
port->elem.in_num, 1);
|
| 691 |
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr, |
| 692 |
port->elem.out_num, 1);
|
| 693 |
|
| 694 |
/*
|
| 695 |
* Port was throttled on source machine. Let's
|
| 696 |
* unthrottle it here so data starts flowing again.
|
| 697 |
*/
|
| 698 |
virtio_serial_throttle_port(port, false);
|
| 699 |
} |
| 700 |
} |
| 701 |
} |
| 702 |
qemu_mod_timer(s->post_load->timer, 1);
|
| 703 |
return 0; |
| 704 |
} |
| 705 |
|
| 706 |
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) |
| 707 |
{
|
| 708 |
VirtIOSerial *s = opaque; |
| 709 |
uint32_t max_nr_ports, nr_active_ports, ports_map; |
| 710 |
unsigned int i; |
| 711 |
int ret;
|
| 712 |
|
| 713 |
if (version_id > 3) { |
| 714 |
return -EINVAL;
|
| 715 |
} |
| 716 |
|
| 717 |
/* The virtio device */
|
| 718 |
ret = virtio_load(&s->vdev, f); |
| 719 |
if (ret) {
|
| 720 |
return ret;
|
| 721 |
} |
| 722 |
|
| 723 |
if (version_id < 2) { |
| 724 |
return 0; |
| 725 |
} |
| 726 |
|
| 727 |
/* The config space */
|
| 728 |
qemu_get_be16s(f, &s->config.cols); |
| 729 |
qemu_get_be16s(f, &s->config.rows); |
| 730 |
|
| 731 |
qemu_get_be32s(f, &max_nr_ports); |
| 732 |
tswap32s(&max_nr_ports); |
| 733 |
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
|
| 734 |
/* Source could have had more ports than us. Fail migration. */
|
| 735 |
return -EINVAL;
|
| 736 |
} |
| 737 |
|
| 738 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
| 739 |
qemu_get_be32s(f, &ports_map); |
| 740 |
|
| 741 |
if (ports_map != s->ports_map[i]) {
|
| 742 |
/*
|
| 743 |
* Ports active on source and destination don't
|
| 744 |
* match. Fail migration.
|
| 745 |
*/
|
| 746 |
return -EINVAL;
|
| 747 |
} |
| 748 |
} |
| 749 |
|
| 750 |
qemu_get_be32s(f, &nr_active_ports); |
| 751 |
|
| 752 |
if (nr_active_ports) {
|
| 753 |
ret = fetch_active_ports_list(f, version_id, s, nr_active_ports); |
| 754 |
if (ret) {
|
| 755 |
return ret;
|
| 756 |
} |
| 757 |
} |
| 758 |
return 0; |
| 759 |
} |
| 760 |
|
| 761 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent); |
| 762 |
|
| 763 |
static Property virtser_props[] = {
|
| 764 |
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
|
| 765 |
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
|
| 766 |
DEFINE_PROP_END_OF_LIST() |
| 767 |
}; |
| 768 |
|
| 769 |
#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus" |
| 770 |
#define VIRTIO_SERIAL_BUS(obj) \
|
| 771 |
OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS) |
| 772 |
|
| 773 |
static void virtser_bus_class_init(ObjectClass *klass, void *data) |
| 774 |
{
|
| 775 |
BusClass *k = BUS_CLASS(klass); |
| 776 |
k->print_dev = virtser_bus_dev_print; |
| 777 |
} |
| 778 |
|
| 779 |
static const TypeInfo virtser_bus_info = { |
| 780 |
.name = TYPE_VIRTIO_SERIAL_BUS, |
| 781 |
.parent = TYPE_BUS, |
| 782 |
.instance_size = sizeof(VirtIOSerialBus),
|
| 783 |
.class_init = virtser_bus_class_init, |
| 784 |
}; |
| 785 |
|
| 786 |
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent) |
| 787 |
{
|
| 788 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
| 789 |
|
| 790 |
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
|
| 791 |
indent, "", port->id,
|
| 792 |
port->guest_connected ? "on" : "off", |
| 793 |
port->host_connected ? "on" : "off", |
| 794 |
port->throttled ? "on" : "off"); |
| 795 |
} |
| 796 |
|
| 797 |
/* This function is only used if a port id is not provided by the user */
|
| 798 |
static uint32_t find_free_port_id(VirtIOSerial *vser)
|
| 799 |
{
|
| 800 |
unsigned int i, max_nr_ports; |
| 801 |
|
| 802 |
max_nr_ports = tswap32(vser->config.max_nr_ports); |
| 803 |
for (i = 0; i < (max_nr_ports + 31) / 32; i++) { |
| 804 |
uint32_t map, bit; |
| 805 |
|
| 806 |
map = vser->ports_map[i]; |
| 807 |
bit = ffs(~map); |
| 808 |
if (bit) {
|
| 809 |
return (bit - 1) + i * 32; |
| 810 |
} |
| 811 |
} |
| 812 |
return VIRTIO_CONSOLE_BAD_ID;
|
| 813 |
} |
| 814 |
|
| 815 |
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
| 816 |
{
|
| 817 |
unsigned int i; |
| 818 |
|
| 819 |
i = port_id / 32;
|
| 820 |
vser->ports_map[i] |= 1U << (port_id % 32); |
| 821 |
} |
| 822 |
|
| 823 |
static void add_port(VirtIOSerial *vser, uint32_t port_id) |
| 824 |
{
|
| 825 |
mark_port_added(vser, port_id); |
| 826 |
send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
| 827 |
} |
| 828 |
|
| 829 |
static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
| 830 |
{
|
| 831 |
VirtIOSerialPort *port; |
| 832 |
unsigned int i; |
| 833 |
|
| 834 |
i = port_id / 32;
|
| 835 |
vser->ports_map[i] &= ~(1U << (port_id % 32)); |
| 836 |
|
| 837 |
port = find_port_by_id(vser, port_id); |
| 838 |
/*
|
| 839 |
* This function is only called from qdev's unplug callback; if we
|
| 840 |
* get a NULL port here, we're in trouble.
|
| 841 |
*/
|
| 842 |
assert(port); |
| 843 |
|
| 844 |
/* Flush out any unconsumed buffers first */
|
| 845 |
discard_vq_data(port->ovq, &port->vser->vdev); |
| 846 |
|
| 847 |
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
| 848 |
} |
| 849 |
|
| 850 |
static int virtser_port_qdev_init(DeviceState *qdev) |
| 851 |
{
|
| 852 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
| 853 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 854 |
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus); |
| 855 |
int ret, max_nr_ports;
|
| 856 |
bool plugging_port0;
|
| 857 |
|
| 858 |
port->vser = bus->vser; |
| 859 |
port->bh = qemu_bh_new(flush_queued_data_bh, port); |
| 860 |
|
| 861 |
assert(vsc->have_data); |
| 862 |
|
| 863 |
/*
|
| 864 |
* Is the first console port we're seeing? If so, put it up at
|
| 865 |
* location 0. This is done for backward compatibility (old
|
| 866 |
* kernel, new qemu).
|
| 867 |
*/
|
| 868 |
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
|
| 869 |
|
| 870 |
if (find_port_by_id(port->vser, port->id)) {
|
| 871 |
error_report("virtio-serial-bus: A port already exists at id %u",
|
| 872 |
port->id); |
| 873 |
return -1; |
| 874 |
} |
| 875 |
|
| 876 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
| 877 |
if (plugging_port0) {
|
| 878 |
port->id = 0;
|
| 879 |
} else {
|
| 880 |
port->id = find_free_port_id(port->vser); |
| 881 |
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
|
| 882 |
error_report("virtio-serial-bus: Maximum port limit for this device reached");
|
| 883 |
return -1; |
| 884 |
} |
| 885 |
} |
| 886 |
} |
| 887 |
|
| 888 |
max_nr_ports = tswap32(port->vser->config.max_nr_ports); |
| 889 |
if (port->id >= max_nr_ports) {
|
| 890 |
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
|
| 891 |
max_nr_ports - 1);
|
| 892 |
return -1; |
| 893 |
} |
| 894 |
|
| 895 |
ret = vsc->init(port); |
| 896 |
if (ret) {
|
| 897 |
return ret;
|
| 898 |
} |
| 899 |
|
| 900 |
port->elem.out_num = 0;
|
| 901 |
|
| 902 |
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
| 903 |
port->ivq = port->vser->ivqs[port->id]; |
| 904 |
port->ovq = port->vser->ovqs[port->id]; |
| 905 |
|
| 906 |
add_port(port->vser, port->id); |
| 907 |
|
| 908 |
/* Send an update to the guest about this new port added */
|
| 909 |
virtio_notify_config(&port->vser->vdev); |
| 910 |
|
| 911 |
return ret;
|
| 912 |
} |
| 913 |
|
| 914 |
static int virtser_port_qdev_exit(DeviceState *qdev) |
| 915 |
{
|
| 916 |
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev); |
| 917 |
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 918 |
VirtIOSerial *vser = port->vser; |
| 919 |
|
| 920 |
qemu_bh_delete(port->bh); |
| 921 |
remove_port(port->vser, port->id); |
| 922 |
|
| 923 |
QTAILQ_REMOVE(&vser->ports, port, next); |
| 924 |
|
| 925 |
if (vsc->exit) {
|
| 926 |
vsc->exit(port); |
| 927 |
} |
| 928 |
return 0; |
| 929 |
} |
| 930 |
|
| 931 |
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf) |
| 932 |
{
|
| 933 |
VirtIOSerial *vser; |
| 934 |
VirtIODevice *vdev; |
| 935 |
uint32_t i, max_supported_ports; |
| 936 |
|
| 937 |
if (!conf->max_virtserial_ports)
|
| 938 |
return NULL; |
| 939 |
|
| 940 |
/* Each port takes 2 queues, and one pair is for the control queue */
|
| 941 |
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1; |
| 942 |
|
| 943 |
if (conf->max_virtserial_ports > max_supported_ports) {
|
| 944 |
error_report("maximum ports supported: %u", max_supported_ports);
|
| 945 |
return NULL; |
| 946 |
} |
| 947 |
|
| 948 |
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
|
| 949 |
sizeof(struct virtio_console_config), |
| 950 |
sizeof(VirtIOSerial));
|
| 951 |
|
| 952 |
vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 953 |
|
| 954 |
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
| 955 |
qbus_create_inplace(&vser->bus.qbus, TYPE_VIRTIO_SERIAL_BUS, dev, NULL);
|
| 956 |
vser->bus.qbus.allow_hotplug = 1;
|
| 957 |
vser->bus.vser = vser; |
| 958 |
QTAILQ_INIT(&vser->ports); |
| 959 |
|
| 960 |
vser->bus.max_nr_ports = conf->max_virtserial_ports; |
| 961 |
vser->ivqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
| 962 |
vser->ovqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
|
| 963 |
|
| 964 |
/* Add a queue for host to guest transfers for port 0 (backward compat) */
|
| 965 |
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
| 966 |
/* Add a queue for guest to host transfers for port 0 (backward compat) */
|
| 967 |
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
| 968 |
|
| 969 |
/* TODO: host to guest notifications can get dropped
|
| 970 |
* if the queue fills up. Implement queueing in host,
|
| 971 |
* this might also make it possible to reduce the control
|
| 972 |
* queue size: as guest preposts buffers there,
|
| 973 |
* this will save 4Kbyte of guest memory per entry. */
|
| 974 |
|
| 975 |
/* control queue: host to guest */
|
| 976 |
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
|
| 977 |
/* control queue: guest to host */
|
| 978 |
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
|
| 979 |
|
| 980 |
for (i = 1; i < vser->bus.max_nr_ports; i++) { |
| 981 |
/* Add a per-port queue for host to guest transfers */
|
| 982 |
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
|
| 983 |
/* Add a per-per queue for guest to host transfers */
|
| 984 |
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
|
| 985 |
} |
| 986 |
|
| 987 |
vser->config.max_nr_ports = tswap32(conf->max_virtserial_ports); |
| 988 |
vser->ports_map = g_malloc0(((conf->max_virtserial_ports + 31) / 32) |
| 989 |
* sizeof(vser->ports_map[0])); |
| 990 |
/*
|
| 991 |
* Reserve location 0 for a console port for backward compat
|
| 992 |
* (old kernel, new qemu)
|
| 993 |
*/
|
| 994 |
mark_port_added(vser, 0);
|
| 995 |
|
| 996 |
vser->vdev.get_features = get_features; |
| 997 |
vser->vdev.get_config = get_config; |
| 998 |
vser->vdev.set_config = set_config; |
| 999 |
vser->vdev.set_status = set_status; |
| 1000 |
vser->vdev.reset = vser_reset; |
| 1001 |
|
| 1002 |
vser->qdev = dev; |
| 1003 |
|
| 1004 |
vser->post_load = NULL;
|
| 1005 |
|
| 1006 |
/*
|
| 1007 |
* Register for the savevm section with the virtio-console name
|
| 1008 |
* to preserve backward compat
|
| 1009 |
*/
|
| 1010 |
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save, |
| 1011 |
virtio_serial_load, vser); |
| 1012 |
|
| 1013 |
return vdev;
|
| 1014 |
} |
| 1015 |
|
| 1016 |
void virtio_serial_exit(VirtIODevice *vdev)
|
| 1017 |
{
|
| 1018 |
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev); |
| 1019 |
|
| 1020 |
unregister_savevm(vser->qdev, "virtio-console", vser);
|
| 1021 |
|
| 1022 |
g_free(vser->ivqs); |
| 1023 |
g_free(vser->ovqs); |
| 1024 |
g_free(vser->ports_map); |
| 1025 |
if (vser->post_load) {
|
| 1026 |
g_free(vser->post_load->connected); |
| 1027 |
qemu_del_timer(vser->post_load->timer); |
| 1028 |
qemu_free_timer(vser->post_load->timer); |
| 1029 |
g_free(vser->post_load); |
| 1030 |
} |
| 1031 |
virtio_cleanup(vdev); |
| 1032 |
} |
| 1033 |
|
| 1034 |
static void virtio_serial_port_class_init(ObjectClass *klass, void *data) |
| 1035 |
{
|
| 1036 |
DeviceClass *k = DEVICE_CLASS(klass); |
| 1037 |
k->init = virtser_port_qdev_init; |
| 1038 |
k->bus_type = TYPE_VIRTIO_SERIAL_BUS; |
| 1039 |
k->exit = virtser_port_qdev_exit; |
| 1040 |
k->unplug = qdev_simple_unplug_cb; |
| 1041 |
k->props = virtser_props; |
| 1042 |
} |
| 1043 |
|
| 1044 |
static const TypeInfo virtio_serial_port_type_info = { |
| 1045 |
.name = TYPE_VIRTIO_SERIAL_PORT, |
| 1046 |
.parent = TYPE_DEVICE, |
| 1047 |
.instance_size = sizeof(VirtIOSerialPort),
|
| 1048 |
.abstract = true,
|
| 1049 |
.class_size = sizeof(VirtIOSerialPortClass),
|
| 1050 |
.class_init = virtio_serial_port_class_init, |
| 1051 |
}; |
| 1052 |
|
| 1053 |
static void virtio_serial_register_types(void) |
| 1054 |
{
|
| 1055 |
type_register_static(&virtser_bus_info); |
| 1056 |
type_register_static(&virtio_serial_port_type_info); |
| 1057 |
} |
| 1058 |
|
| 1059 |
type_init(virtio_serial_register_types) |