Now all the usages of the old version of VMSTATE_VIRTIO_DEVICE are gone, so we can get rid of the conditionals, and the old macro. Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1187 lines
34 KiB
C
1187 lines
34 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 "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/iov.h"
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#include "monitor/monitor.h"
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#include "qemu/error-report.h"
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#include "qemu/queue.h"
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#include "hw/sysbus.h"
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#include "trace.h"
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#include "hw/virtio/virtio-serial.h"
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#include "hw/virtio/virtio-access.h"
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static struct VirtIOSerialDevices {
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QLIST_HEAD(, VirtIOSerial) devices;
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} vserdevices;
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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 VirtIOSerialPort *find_port_by_name(char *name)
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{
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VirtIOSerial *vser;
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QLIST_FOREACH(vser, &vserdevices.devices, next) {
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VirtIOSerialPort *port;
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QTAILQ_FOREACH(port, &vser->ports, next) {
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if (port->name && !strcmp(port->name, name)) {
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return port;
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}
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}
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}
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return NULL;
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}
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static VirtIOSerialPort *find_first_connected_console(VirtIOSerial *vser)
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{
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VirtIOSerialPort *port;
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QTAILQ_FOREACH(port, &vser->ports, next) {
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VirtIOSerialPortClass const *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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if (vsc->is_console && port->host_connected) {
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return port;
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}
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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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VirtIODevice *vdev = VIRTIO_DEVICE(vser);
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return virtio_vdev_has_feature(vdev, 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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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!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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g_free(elem);
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}
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virtio_notify(VIRTIO_DEVICE(port->vser), 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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for (;;) {
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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!elem) {
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break;
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}
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virtqueue_push(vq, elem, 0);
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g_free(elem);
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}
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virtio_notify(vdev, vq);
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}
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static void discard_throttle_data(VirtIOSerialPort *port)
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{
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if (port->elem) {
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virtqueue_detach_element(port->ovq, port->elem, 0);
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g_free(port->elem);
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port->elem = NULL;
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}
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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) {
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port->elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!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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g_free(port->elem);
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port->elem = NULL;
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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, VIRTIO_DEVICE(port->vser));
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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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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!elem) {
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return 0;
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}
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/* TODO: detect a buffer that's too short, set NEEDS_RESET */
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iov_from_buf(elem->in_sg, elem->in_num, 0, buf, len);
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virtqueue_push(vq, elem, len);
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virtio_notify(VIRTIO_DEVICE(vser), vq);
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g_free(elem);
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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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VirtIODevice *vdev = VIRTIO_DEVICE(vser);
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struct virtio_console_control cpkt;
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virtio_stl_p(vdev, &cpkt.id, port_id);
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virtio_stw_p(vdev, &cpkt.event, event);
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virtio_stw_p(vdev, &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_throttle_data(port);
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discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser));
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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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VirtIODevice *vdev = VIRTIO_DEVICE(port->vser);
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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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!(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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VirtIODevice *vdev = VIRTIO_DEVICE(vser);
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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 = virtio_lduw_p(vdev, &gcpkt->event);
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cpkt.value = virtio_lduw_p(vdev, &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(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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port = find_port_by_id(vser, virtio_ldl_p(vdev, &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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virtio_ldl_p(vdev, &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(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
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}
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if (port->name) {
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virtio_stl_p(vdev, &cpkt.id, port->id);
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virtio_stw_p(vdev, &cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
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virtio_stw_p(vdev, &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(vser, 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(vser, port->id, 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 (vsc->set_guest_connected) {
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/* Send the guest opened notification if an app is interested */
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vsc->set_guest_connected(port, cpkt.value);
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}
|
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break;
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}
|
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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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|
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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 = VIRTIO_SERIAL(vdev);
|
|
|
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len = 0;
|
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buf = NULL;
|
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for (;;) {
|
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size_t cur_len;
|
|
|
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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
|
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if (!elem) {
|
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break;
|
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}
|
|
|
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cur_len = iov_size(elem->out_sg, elem->out_num);
|
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/*
|
|
* Allocate a new buf only if we didn't have one previously or
|
|
* if the size of the buf differs
|
|
*/
|
|
if (cur_len > len) {
|
|
g_free(buf);
|
|
|
|
buf = g_malloc(cur_len);
|
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len = cur_len;
|
|
}
|
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iov_to_buf(elem->out_sg, elem->out_num, 0, buf, cur_len);
|
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|
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handle_control_message(vser, buf, cur_len);
|
|
virtqueue_push(vq, elem, 0);
|
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g_free(elem);
|
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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. */
|
|
static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
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VirtIOSerial *vser;
|
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VirtIOSerialPort *port;
|
|
|
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vser = VIRTIO_SERIAL(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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}
|
|
|
|
if (!port->throttled) {
|
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do_flush_queued_data(port, vq, vdev);
|
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return;
|
|
}
|
|
}
|
|
|
|
static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/*
|
|
* Users of virtio-serial would like to know when guest becomes
|
|
* writable again -- i.e. if a vq had stuff queued up and the
|
|
* guest wasn't reading at all, the host would not be able to
|
|
* write to the vq anymore. Once the guest reads off something,
|
|
* we can start queueing things up again. However, this call is
|
|
* made for each buffer addition by the guest -- even though free
|
|
* buffers existed prior to the current buffer addition. This is
|
|
* done so as not to maintain previous state, which will need
|
|
* additional live-migration-related changes.
|
|
*/
|
|
VirtIOSerial *vser;
|
|
VirtIOSerialPort *port;
|
|
VirtIOSerialPortClass *vsc;
|
|
|
|
vser = VIRTIO_SERIAL(vdev);
|
|
port = find_port_by_vq(vser, vq);
|
|
|
|
if (!port) {
|
|
return;
|
|
}
|
|
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
|
|
/*
|
|
* If guest_connected is false, this call is being made by the
|
|
* early-boot queueing up of descriptors, which is just noise for
|
|
* the host apps -- don't disturb them in that case.
|
|
*/
|
|
if (port->guest_connected && port->host_connected && vsc->guest_writable) {
|
|
vsc->guest_writable(port);
|
|
}
|
|
}
|
|
|
|
static uint64_t get_features(VirtIODevice *vdev, uint64_t features,
|
|
Error **errp)
|
|
{
|
|
VirtIOSerial *vser;
|
|
|
|
vser = VIRTIO_SERIAL(vdev);
|
|
|
|
features |= vser->host_features;
|
|
if (vser->bus.max_nr_ports > 1) {
|
|
virtio_add_feature(&features, VIRTIO_CONSOLE_F_MULTIPORT);
|
|
}
|
|
return features;
|
|
}
|
|
|
|
/* Guest requested config info */
|
|
static void get_config(VirtIODevice *vdev, uint8_t *config_data)
|
|
{
|
|
VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
|
|
struct virtio_console_config *config =
|
|
(struct virtio_console_config *)config_data;
|
|
|
|
config->cols = 0;
|
|
config->rows = 0;
|
|
config->max_nr_ports = virtio_tswap32(vdev,
|
|
vser->serial.max_virtserial_ports);
|
|
}
|
|
|
|
/* Guest sent new config info */
|
|
static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
|
|
{
|
|
VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
|
|
struct virtio_console_config *config =
|
|
(struct virtio_console_config *)config_data;
|
|
uint8_t emerg_wr_lo = le32_to_cpu(config->emerg_wr);
|
|
VirtIOSerialPort *port = find_first_connected_console(vser);
|
|
VirtIOSerialPortClass *vsc;
|
|
|
|
if (!config->emerg_wr) {
|
|
return;
|
|
}
|
|
/* Make sure we don't misdetect an emergency write when the guest
|
|
* does a short config write after an emergency write. */
|
|
config->emerg_wr = 0;
|
|
if (!port) {
|
|
return;
|
|
}
|
|
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
(void)vsc->have_data(port, &emerg_wr_lo, 1);
|
|
}
|
|
|
|
static void guest_reset(VirtIOSerial *vser)
|
|
{
|
|
VirtIOSerialPort *port;
|
|
VirtIOSerialPortClass *vsc;
|
|
|
|
QTAILQ_FOREACH(port, &vser->ports, next) {
|
|
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
|
|
discard_throttle_data(port);
|
|
|
|
if (port->guest_connected) {
|
|
port->guest_connected = false;
|
|
if (vsc->set_guest_connected) {
|
|
vsc->set_guest_connected(port, false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void set_status(VirtIODevice *vdev, uint8_t status)
|
|
{
|
|
VirtIOSerial *vser;
|
|
VirtIOSerialPort *port;
|
|
|
|
vser = VIRTIO_SERIAL(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 = VIRTIO_SERIAL(vdev);
|
|
guest_reset(vser);
|
|
}
|
|
|
|
static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
VirtIOSerial *s = VIRTIO_SERIAL(vdev);
|
|
VirtIOSerialPort *port;
|
|
uint32_t nr_active_ports;
|
|
unsigned int i, max_nr_ports;
|
|
struct virtio_console_config config;
|
|
|
|
/* The config space (ignored on the far end in current versions) */
|
|
get_config(vdev, (uint8_t *)&config);
|
|
qemu_put_be16s(f, &config.cols);
|
|
qemu_put_be16s(f, &config.rows);
|
|
qemu_put_be32s(f, &config.max_nr_ports);
|
|
|
|
/* The ports map */
|
|
max_nr_ports = s->serial.max_virtserial_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) {
|
|
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_virtqueue_element(f, port->elem);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtio_serial_post_load_timer_cb(void *opaque)
|
|
{
|
|
uint32_t i;
|
|
VirtIOSerial *s = VIRTIO_SERIAL(opaque);
|
|
VirtIOSerialPort *port;
|
|
uint8_t host_connected;
|
|
VirtIOSerialPortClass *vsc;
|
|
|
|
if (!s->post_load) {
|
|
return;
|
|
}
|
|
for (i = 0 ; i < s->post_load->nr_active_ports; ++i) {
|
|
port = s->post_load->connected[i].port;
|
|
host_connected = s->post_load->connected[i].host_connected;
|
|
if (host_connected != port->host_connected) {
|
|
/*
|
|
* We have to let the guest know of the host connection
|
|
* status change
|
|
*/
|
|
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN,
|
|
port->host_connected);
|
|
}
|
|
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
if (vsc->set_guest_connected) {
|
|
vsc->set_guest_connected(port, port->guest_connected);
|
|
}
|
|
}
|
|
g_free(s->post_load->connected);
|
|
timer_free(s->post_load->timer);
|
|
g_free(s->post_load);
|
|
s->post_load = NULL;
|
|
}
|
|
|
|
static int fetch_active_ports_list(QEMUFile *f,
|
|
VirtIOSerial *s, uint32_t nr_active_ports)
|
|
{
|
|
uint32_t i;
|
|
|
|
s->post_load = g_malloc0(sizeof(*s->post_load));
|
|
s->post_load->nr_active_ports = nr_active_ports;
|
|
s->post_load->connected =
|
|
g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
|
|
|
|
s->post_load->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
|
|
virtio_serial_post_load_timer_cb,
|
|
s);
|
|
|
|
/* Items in struct VirtIOSerialPort */
|
|
for (i = 0; i < nr_active_ports; i++) {
|
|
VirtIOSerialPort *port;
|
|
uint32_t elem_popped;
|
|
uint32_t id;
|
|
|
|
id = qemu_get_be32(f);
|
|
port = find_port_by_id(s, id);
|
|
if (!port) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
port->guest_connected = qemu_get_byte(f);
|
|
s->post_load->connected[i].port = port;
|
|
s->post_load->connected[i].host_connected = qemu_get_byte(f);
|
|
|
|
qemu_get_be32s(f, &elem_popped);
|
|
if (elem_popped) {
|
|
qemu_get_be32s(f, &port->iov_idx);
|
|
qemu_get_be64s(f, &port->iov_offset);
|
|
|
|
port->elem =
|
|
qemu_get_virtqueue_element(f, sizeof(VirtQueueElement));
|
|
|
|
/*
|
|
* Port was throttled on source machine. Let's
|
|
* unthrottle it here so data starts flowing again.
|
|
*/
|
|
virtio_serial_throttle_port(port, false);
|
|
}
|
|
}
|
|
timer_mod(s->post_load->timer, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_serial_load_device(VirtIODevice *vdev, QEMUFile *f,
|
|
int version_id)
|
|
{
|
|
VirtIOSerial *s = VIRTIO_SERIAL(vdev);
|
|
uint32_t max_nr_ports, nr_active_ports, ports_map;
|
|
unsigned int i;
|
|
int ret;
|
|
uint32_t tmp;
|
|
|
|
/* Unused */
|
|
qemu_get_be16s(f, (uint16_t *) &tmp);
|
|
qemu_get_be16s(f, (uint16_t *) &tmp);
|
|
qemu_get_be32s(f, &tmp);
|
|
|
|
max_nr_ports = s->serial.max_virtserial_ports;
|
|
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);
|
|
|
|
if (nr_active_ports) {
|
|
ret = fetch_active_ports_list(f, s, nr_active_ports);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
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 = VIRTIO_SERIAL_PORT(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 = vser->serial.max_virtserial_ports;
|
|
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
|
|
uint32_t map, zeroes;
|
|
|
|
map = vser->ports_map[i];
|
|
zeroes = ctz32(~map);
|
|
if (zeroes != 32) {
|
|
return zeroes + 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(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
|
|
}
|
|
|
|
static void remove_port(VirtIOSerial *vser, uint32_t port_id)
|
|
{
|
|
VirtIOSerialPort *port;
|
|
|
|
/*
|
|
* Don't mark port 0 removed -- we explicitly reserve it for
|
|
* backward compat with older guests, ensure a virtconsole device
|
|
* unplug retains the reservation.
|
|
*/
|
|
if (port_id) {
|
|
unsigned int i;
|
|
|
|
i = port_id / 32;
|
|
vser->ports_map[i] &= ~(1U << (port_id % 32));
|
|
}
|
|
|
|
port = find_port_by_id(vser, port_id);
|
|
/*
|
|
* This function is only called from qdev's unplug callback; if we
|
|
* get a NULL port here, we're in trouble.
|
|
*/
|
|
assert(port);
|
|
|
|
/* Flush out any unconsumed buffers first */
|
|
discard_throttle_data(port);
|
|
discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser));
|
|
|
|
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
|
|
}
|
|
|
|
static void virtser_port_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
|
|
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
|
|
VirtIOSerialBus *bus = VIRTIO_SERIAL_BUS(qdev_get_parent_bus(dev));
|
|
int max_nr_ports;
|
|
bool plugging_port0;
|
|
Error *err = NULL;
|
|
|
|
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_setg(errp, "virtio-serial-bus: A port already exists at id %u",
|
|
port->id);
|
|
return;
|
|
}
|
|
|
|
if (port->name != NULL && find_port_by_name(port->name)) {
|
|
error_setg(errp, "virtio-serial-bus: A port already exists by name %s",
|
|
port->name);
|
|
return;
|
|
}
|
|
|
|
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_setg(errp, "virtio-serial-bus: Maximum port limit for "
|
|
"this device reached");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
max_nr_ports = port->vser->serial.max_virtserial_ports;
|
|
if (port->id >= max_nr_ports) {
|
|
error_setg(errp, "virtio-serial-bus: Out-of-range port id specified, "
|
|
"max. allowed: %u", max_nr_ports - 1);
|
|
return;
|
|
}
|
|
|
|
vsc->realize(dev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
port->elem = NULL;
|
|
}
|
|
|
|
static void virtser_port_device_plug(HotplugHandler *hotplug_dev,
|
|
DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
|
|
|
|
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(VIRTIO_DEVICE(hotplug_dev));
|
|
}
|
|
|
|
static void virtser_port_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
|
|
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
|
|
VirtIOSerial *vser = port->vser;
|
|
|
|
qemu_bh_delete(port->bh);
|
|
remove_port(port->vser, port->id);
|
|
|
|
QTAILQ_REMOVE(&vser->ports, port, next);
|
|
|
|
if (vsc->unrealize) {
|
|
vsc->unrealize(dev, errp);
|
|
}
|
|
}
|
|
|
|
static void virtio_serial_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSerial *vser = VIRTIO_SERIAL(dev);
|
|
uint32_t i, max_supported_ports;
|
|
size_t config_size = sizeof(struct virtio_console_config);
|
|
|
|
if (!vser->serial.max_virtserial_ports) {
|
|
error_setg(errp, "Maximum number of serial ports not specified");
|
|
return;
|
|
}
|
|
|
|
/* Each port takes 2 queues, and one pair is for the control queue */
|
|
max_supported_ports = VIRTIO_QUEUE_MAX / 2 - 1;
|
|
|
|
if (vser->serial.max_virtserial_ports > max_supported_ports) {
|
|
error_setg(errp, "maximum ports supported: %u", max_supported_ports);
|
|
return;
|
|
}
|
|
|
|
if (!virtio_has_feature(vser->host_features,
|
|
VIRTIO_CONSOLE_F_EMERG_WRITE)) {
|
|
config_size = offsetof(struct virtio_console_config, emerg_wr);
|
|
}
|
|
virtio_init(vdev, "virtio-serial", VIRTIO_ID_CONSOLE,
|
|
config_size);
|
|
|
|
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
|
|
qbus_create_inplace(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS,
|
|
dev, vdev->bus_name);
|
|
qbus_set_hotplug_handler(BUS(&vser->bus), DEVICE(vser), errp);
|
|
vser->bus.vser = vser;
|
|
QTAILQ_INIT(&vser->ports);
|
|
|
|
vser->bus.max_nr_ports = vser->serial.max_virtserial_ports;
|
|
vser->ivqs = g_malloc(vser->serial.max_virtserial_ports
|
|
* sizeof(VirtQueue *));
|
|
vser->ovqs = g_malloc(vser->serial.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->ports_map = g_malloc0(((vser->serial.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->post_load = NULL;
|
|
|
|
QLIST_INSERT_HEAD(&vserdevices.devices, vser, next);
|
|
}
|
|
|
|
static void virtio_serial_port_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *k = DEVICE_CLASS(klass);
|
|
|
|
set_bit(DEVICE_CATEGORY_INPUT, k->categories);
|
|
k->bus_type = TYPE_VIRTIO_SERIAL_BUS;
|
|
k->realize = virtser_port_device_realize;
|
|
k->unrealize = virtser_port_device_unrealize;
|
|
k->props = virtser_props;
|
|
}
|
|
|
|
static const 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_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSerial *vser = VIRTIO_SERIAL(dev);
|
|
|
|
QLIST_REMOVE(vser, next);
|
|
|
|
g_free(vser->ivqs);
|
|
g_free(vser->ovqs);
|
|
g_free(vser->ports_map);
|
|
if (vser->post_load) {
|
|
g_free(vser->post_load->connected);
|
|
timer_del(vser->post_load->timer);
|
|
timer_free(vser->post_load->timer);
|
|
g_free(vser->post_load);
|
|
}
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
/* Note: 'console' is used for backwards compatibility */
|
|
static const VMStateDescription vmstate_virtio_console = {
|
|
.name = "virtio-console",
|
|
.minimum_version_id = 3,
|
|
.version_id = 3,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static Property virtio_serial_properties[] = {
|
|
DEFINE_PROP_UINT32("max_ports", VirtIOSerial, serial.max_virtserial_ports,
|
|
31),
|
|
DEFINE_PROP_BIT64("emergency-write", VirtIOSerial, host_features,
|
|
VIRTIO_CONSOLE_F_EMERG_WRITE, true),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_serial_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
|
|
|
|
QLIST_INIT(&vserdevices.devices);
|
|
|
|
dc->props = virtio_serial_properties;
|
|
dc->vmsd = &vmstate_virtio_console;
|
|
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
|
|
vdc->realize = virtio_serial_device_realize;
|
|
vdc->unrealize = virtio_serial_device_unrealize;
|
|
vdc->get_features = get_features;
|
|
vdc->get_config = get_config;
|
|
vdc->set_config = set_config;
|
|
vdc->set_status = set_status;
|
|
vdc->reset = vser_reset;
|
|
vdc->save = virtio_serial_save_device;
|
|
vdc->load = virtio_serial_load_device;
|
|
hc->plug = virtser_port_device_plug;
|
|
hc->unplug = qdev_simple_device_unplug_cb;
|
|
}
|
|
|
|
static const TypeInfo virtio_device_info = {
|
|
.name = TYPE_VIRTIO_SERIAL,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOSerial),
|
|
.class_init = virtio_serial_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_HOTPLUG_HANDLER },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void virtio_serial_register_types(void)
|
|
{
|
|
type_register_static(&virtser_bus_info);
|
|
type_register_static(&virtio_serial_port_type_info);
|
|
type_register_static(&virtio_device_info);
|
|
}
|
|
|
|
type_init(virtio_serial_register_types)
|