The number of ports on the source as well as the destination machines should match. If they don't, it means some ports that got hotplugged on the source aren't instantiated on the destination. Or that ports that were hot-unplugged on the source are created on the destination. Signed-off-by: Amit Shah <amit.shah@redhat.com> Reported-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
645 lines
18 KiB
C
645 lines
18 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 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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#include "monitor.h"
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#include "qemu-queue.h"
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#include "sysbus.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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QTAILQ_HEAD(, VirtIOSerialPort) ports;
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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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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 = 0;
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size_t len = 0;
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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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if (!size) {
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return 0;
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}
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while (offset < size) {
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int i;
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if (!virtqueue_pop(vq, &elem)) {
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break;
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}
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for (i = 0; offset < size && i < elem.in_num; i++) {
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len = MIN(elem.in_sg[i].iov_len, size - offset);
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memcpy(elem.in_sg[i].iov_base, buf + offset, len);
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offset += len;
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}
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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 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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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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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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/* Guest wants to notify us of some event */
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static void handle_control_message(VirtIOSerial *vser, void *buf)
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{
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struct VirtIOSerialPort *port;
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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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port = find_port_by_id(vser, ldl_p(&gcpkt->id));
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if (!port)
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return;
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cpkt.event = lduw_p(&gcpkt->event);
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cpkt.value = lduw_p(&gcpkt->value);
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switch(cpkt.event) {
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case VIRTIO_CONSOLE_PORT_READY:
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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 (port->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 = qemu_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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qemu_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 (port->info->guest_ready) {
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port->info->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 && port->info->guest_open) {
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/* Send the guest opened notification if an app is interested */
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port->info->guest_open(port);
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}
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if (!cpkt.value && port->info->guest_close) {
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/* Send the guest closed notification if an app is interested */
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port->info->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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vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
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while (virtqueue_pop(vq, &elem)) {
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handle_control_message(vser, elem.out_sg[0].iov_base);
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virtqueue_push(vq, &elem, elem.out_sg[0].iov_len);
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}
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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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VirtQueueElement elem;
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vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
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while (virtqueue_pop(vq, &elem)) {
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VirtIOSerialPort *port;
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size_t ret;
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port = find_port_by_vq(vser, vq);
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if (!port) {
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ret = 0;
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goto next_buf;
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}
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/*
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* A port may not have any handler registered for consuming the
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* data that the guest sends or it may not have a chardev associated
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* with it. Just ignore the data in that case.
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*/
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if (!port->info->have_data) {
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ret = 0;
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goto next_buf;
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}
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/* The guest always sends only one sg */
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ret = port->info->have_data(port, elem.out_sg[0].iov_base,
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elem.out_sg[0].iov_len);
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next_buf:
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virtqueue_push(vq, &elem, ret);
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}
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virtio_notify(vdev, vq);
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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 = 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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/* 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);
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memcpy(config_data, &vser->config, sizeof(struct virtio_console_config));
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}
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static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
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{
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struct virtio_console_config config;
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memcpy(&config, config_data, sizeof(config));
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}
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static void virtio_serial_save(QEMUFile *f, void *opaque)
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{
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VirtIOSerial *s = opaque;
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VirtIOSerialPort *port;
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uint32_t nr_active_ports;
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/* The virtio device */
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virtio_save(&s->vdev, f);
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/* The config space */
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qemu_put_be16s(f, &s->config.cols);
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qemu_put_be16s(f, &s->config.rows);
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qemu_put_be32s(f, &s->config.nr_ports);
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/* Items in struct VirtIOSerial */
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qemu_put_be32s(f, &s->bus->max_nr_ports);
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/* Do this because we might have hot-unplugged some ports */
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nr_active_ports = 0;
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QTAILQ_FOREACH(port, &s->ports, next) {
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nr_active_ports++;
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}
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qemu_put_be32s(f, &nr_active_ports);
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/*
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* Items in struct VirtIOSerialPort.
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*/
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QTAILQ_FOREACH(port, &s->ports, next) {
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/*
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* We put the port number because we may not have an active
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* port at id 0 that's reserved for a console port, or in case
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* of ports that might have gotten unplugged
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*/
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qemu_put_be32s(f, &port->id);
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qemu_put_byte(f, port->guest_connected);
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}
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}
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static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
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{
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VirtIOSerial *s = opaque;
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VirtIOSerialPort *port;
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uint32_t max_nr_ports, nr_active_ports, nr_ports;
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unsigned int i;
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if (version_id > 2) {
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return -EINVAL;
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}
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/* The virtio device */
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virtio_load(&s->vdev, f);
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if (version_id < 2) {
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return 0;
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}
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/* The config space */
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qemu_get_be16s(f, &s->config.cols);
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qemu_get_be16s(f, &s->config.rows);
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nr_ports = qemu_get_be32(f);
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if (nr_ports != s->config.nr_ports) {
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/*
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* Source hot-plugged/unplugged ports and we don't have all of
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* them here.
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*
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* Note: This condition cannot check for all hotplug/unplug
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* events: eg, if one port was hot-plugged and one was
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* unplugged, the nr_ports remains the same but the port id's
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* would have changed and we won't catch it here. A later
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* check for !find_port_by_id() will confirm if this happened.
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*/
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return -EINVAL;
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}
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/* Items in struct VirtIOSerial */
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qemu_get_be32s(f, &max_nr_ports);
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if (max_nr_ports > s->bus->max_nr_ports) {
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/* Source could have more ports than us. Fail migration. */
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return -EINVAL;
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}
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qemu_get_be32s(f, &nr_active_ports);
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/* Items in struct VirtIOSerialPort */
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for (i = 0; i < nr_active_ports; i++) {
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uint32_t id;
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id = qemu_get_be32(f);
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port = find_port_by_id(s, id);
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port->guest_connected = qemu_get_byte(f);
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}
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return 0;
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}
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static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
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static struct BusInfo virtser_bus_info = {
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.name = "virtio-serial-bus",
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.size = sizeof(VirtIOSerialBus),
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.print_dev = virtser_bus_dev_print,
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};
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static VirtIOSerialBus *virtser_bus_new(DeviceState *dev)
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{
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VirtIOSerialBus *bus;
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bus = FROM_QBUS(VirtIOSerialBus, qbus_create(&virtser_bus_info, dev, NULL));
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bus->qbus.allow_hotplug = 1;
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return bus;
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}
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static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
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{
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VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
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VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
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monitor_printf(mon, "%*s dev-prop-int: id: %u\n",
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indent, "", port->id);
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monitor_printf(mon, "%*s dev-prop-int: guest_connected: %d\n",
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indent, "", port->guest_connected);
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monitor_printf(mon, "%*s dev-prop-int: host_connected: %d\n",
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indent, "", port->host_connected);
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}
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static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
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{
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VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
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VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev, base);
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VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
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VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus);
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int ret;
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bool plugging_port0;
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port->vser = bus->vser;
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/*
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* Is the first console port we're seeing? If so, put it up at
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* location 0. This is done for backward compatibility (old
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* kernel, new qemu).
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*/
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plugging_port0 = port->is_console && !find_port_by_id(port->vser, 0);
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if (port->vser->config.nr_ports == bus->max_nr_ports && !plugging_port0) {
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error_report("virtio-serial-bus: Maximum device limit reached");
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return -1;
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}
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dev->info = info;
|
|
|
|
ret = info->init(dev);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
port->id = plugging_port0 ? 0 : port->vser->config.nr_ports++;
|
|
|
|
if (!use_multiport(port->vser)) {
|
|
/*
|
|
* Allow writes to guest in this case; we have no way of
|
|
* knowing if a guest port is connected.
|
|
*/
|
|
port->guest_connected = true;
|
|
}
|
|
|
|
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
|
|
port->ivq = port->vser->ivqs[port->id];
|
|
port->ovq = port->vser->ovqs[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)
|
|
{
|
|
VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
|
|
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
|
|
VirtIOSerial *vser = port->vser;
|
|
|
|
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
|
|
|
/*
|
|
* Don't decrement nr_ports here; thus we keep a linearly
|
|
* increasing port id. Not utilising an id again saves us a couple
|
|
* of complications:
|
|
*
|
|
* - Not having to bother about sending the port id to the guest
|
|
* kernel on hotplug or on addition of new ports; the guest can
|
|
* also linearly increment the port number. This is preferable
|
|
* because the config space won't have the need to store a
|
|
* ports_map.
|
|
*
|
|
* - Extra state to be stored for all the "holes" that got created
|
|
* so that we keep filling in the ids from the least available
|
|
* index.
|
|
*
|
|
* When such a functionality is desired, a control message to add
|
|
* a port can be introduced.
|
|
*/
|
|
QTAILQ_REMOVE(&vser->ports, port, next);
|
|
|
|
if (port->info->exit)
|
|
port->info->exit(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void virtio_serial_port_qdev_register(VirtIOSerialPortInfo *info)
|
|
{
|
|
info->qdev.init = virtser_port_qdev_init;
|
|
info->qdev.bus_info = &virtser_bus_info;
|
|
info->qdev.exit = virtser_port_qdev_exit;
|
|
info->qdev.unplug = qdev_simple_unplug_cb;
|
|
qdev_register(&info->qdev);
|
|
}
|
|
|
|
VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
|
|
{
|
|
VirtIOSerial *vser;
|
|
VirtIODevice *vdev;
|
|
uint32_t i;
|
|
|
|
if (!max_nr_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 */
|
|
vser->bus = virtser_bus_new(dev);
|
|
vser->bus->vser = vser;
|
|
QTAILQ_INIT(&vser->ports);
|
|
|
|
vser->bus->max_nr_ports = max_nr_ports;
|
|
vser->ivqs = qemu_malloc(max_nr_ports * sizeof(VirtQueue *));
|
|
vser->ovqs = qemu_malloc(max_nr_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);
|
|
|
|
/* control queue: host to guest */
|
|
vser->c_ivq = virtio_add_queue(vdev, 16, control_in);
|
|
/* control queue: guest to host */
|
|
vser->c_ovq = virtio_add_queue(vdev, 16, 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 = max_nr_ports;
|
|
/*
|
|
* Reserve location 0 for a console port for backward compat
|
|
* (old kernel, new qemu)
|
|
*/
|
|
vser->config.nr_ports = 1;
|
|
|
|
vser->vdev.get_features = get_features;
|
|
vser->vdev.get_config = get_config;
|
|
vser->vdev.set_config = set_config;
|
|
|
|
/*
|
|
* Register for the savevm section with the virtio-console name
|
|
* to preserve backward compat
|
|
*/
|
|
register_savevm("virtio-console", -1, 2, virtio_serial_save,
|
|
virtio_serial_load, vser);
|
|
|
|
return vdev;
|
|
}
|