VirtIOSerialBus *bus;
+ DeviceState *qdev;
+
QTAILQ_HEAD(, VirtIOSerialPort) ports;
/* bitmap for identifying active ports */
return offset;
}
-static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
- VirtIODevice *vdev, bool discard)
+static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
{
VirtQueueElement elem;
- assert(port || discard);
+ if (!virtio_queue_ready(vq)) {
+ return;
+ }
+ while (virtqueue_pop(vq, &elem)) {
+ virtqueue_push(vq, &elem, 0);
+ }
+ virtio_notify(vdev, vq);
+}
- while ((discard || !port->throttled) && virtqueue_pop(vq, &elem)) {
- uint8_t *buf;
- size_t ret, buf_size;
+static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
+ VirtIODevice *vdev)
+{
+ assert(port);
+ assert(virtio_queue_ready(vq));
- if (!discard) {
- buf_size = iov_size(elem.out_sg, elem.out_num);
- buf = qemu_malloc(buf_size);
- ret = iov_to_buf(elem.out_sg, elem.out_num, buf, 0, buf_size);
+ while (!port->throttled) {
+ unsigned int i;
- port->info->have_data(port, buf, ret);
- qemu_free(buf);
+ /* Pop an elem only if we haven't left off a previous one mid-way */
+ if (!port->elem.out_num) {
+ if (!virtqueue_pop(vq, &port->elem)) {
+ break;
+ }
+ port->iov_idx = 0;
+ port->iov_offset = 0;
}
- virtqueue_push(vq, &elem, 0);
+
+ for (i = port->iov_idx; i < port->elem.out_num; i++) {
+ size_t buf_size;
+ ssize_t ret;
+
+ buf_size = port->elem.out_sg[i].iov_len - port->iov_offset;
+ ret = port->info->have_data(port,
+ port->elem.out_sg[i].iov_base
+ + port->iov_offset,
+ buf_size);
+ if (ret < 0 && ret != -EAGAIN) {
+ /* We don't handle any other type of errors here */
+ abort();
+ }
+ if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) {
+ virtio_serial_throttle_port(port, true);
+ port->iov_idx = i;
+ if (ret > 0) {
+ port->iov_offset += ret;
+ }
+ break;
+ }
+ port->iov_offset = 0;
+ }
+ if (port->throttled) {
+ break;
+ }
+ virtqueue_push(vq, &port->elem, 0);
+ port->elem.out_num = 0;
}
virtio_notify(vdev, vq);
}
-static void flush_queued_data(VirtIOSerialPort *port, bool discard)
+static void flush_queued_data(VirtIOSerialPort *port)
{
assert(port);
- do_flush_queued_data(port, port->ovq, &port->vser->vdev, discard);
+ if (!virtio_queue_ready(port->ovq)) {
+ return;
+ }
+ do_flush_queued_data(port, port->ovq, &port->vser->vdev);
}
static size_t send_control_msg(VirtIOSerialPort *port, void *buf, size_t len)
* consume, reset the throttling flag and discard the data.
*/
port->throttled = false;
- flush_queued_data(port, true);
+ discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
return;
}
- flush_queued_data(port, false);
+ flush_queued_data(port);
}
/* Guest wants to notify us of some event */
{
VirtIOSerial *vser;
VirtIOSerialPort *port;
- bool discard;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
port = find_port_by_vq(vser, vq);
- discard = false;
if (!port || !port->host_connected || !port->info->have_data) {
- discard = true;
+ discard_vq_data(vq, vdev);
+ return;
}
- if (!discard && port->throttled) {
+ if (!port->throttled) {
+ do_flush_queued_data(port, vq, vdev);
return;
}
-
- do_flush_queued_data(port, vq, vdev, discard);
}
static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
* Items in struct VirtIOSerialPort.
*/
QTAILQ_FOREACH(port, &s->ports, next) {
+ uint32_t elem_popped;
+
qemu_put_be32s(f, &port->id);
qemu_put_byte(f, port->guest_connected);
qemu_put_byte(f, port->host_connected);
+
+ elem_popped = 0;
+ if (port->elem.out_num) {
+ elem_popped = 1;
+ }
+ qemu_put_be32s(f, &elem_popped);
+ if (elem_popped) {
+ qemu_put_be32s(f, &port->iov_idx);
+ qemu_put_be64s(f, &port->iov_offset);
+
+ qemu_put_buffer(f, (unsigned char *)&port->elem,
+ sizeof(port->elem));
+ }
}
}
{
VirtIOSerial *s = opaque;
VirtIOSerialPort *port;
- size_t ports_map_size;
- uint32_t max_nr_ports, nr_active_ports, *ports_map;
+ uint32_t max_nr_ports, nr_active_ports, ports_map;
unsigned int i;
- if (version_id > 2) {
+ if (version_id > 3) {
return -EINVAL;
}
return -EINVAL;
}
- ports_map_size = sizeof(uint32_t) * (max_nr_ports + 31) / 32;
- ports_map = qemu_malloc(ports_map_size);
-
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
- qemu_get_be32s(f, &ports_map[i]);
+ qemu_get_be32s(f, &ports_map);
- if (ports_map[i] != s->ports_map[i]) {
+ if (ports_map != s->ports_map[i]) {
/*
* Ports active on source and destination don't
* match. Fail migration.
*/
- qemu_free(ports_map);
return -EINVAL;
}
}
- qemu_free(ports_map);
qemu_get_be32s(f, &nr_active_ports);
id = qemu_get_be32(f);
port = find_port_by_id(s, id);
+ if (!port) {
+ return -EINVAL;
+ }
port->guest_connected = qemu_get_byte(f);
host_connected = qemu_get_byte(f);
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN,
port->host_connected);
}
+
+ if (version_id > 2) {
+ uint32_t elem_popped;
+
+ qemu_get_be32s(f, &elem_popped);
+ if (elem_popped) {
+ qemu_get_be32s(f, &port->iov_idx);
+ qemu_get_be64s(f, &port->iov_offset);
+
+ qemu_get_buffer(f, (unsigned char *)&port->elem,
+ sizeof(port->elem));
+ virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr,
+ port->elem.in_num, 1);
+ virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr,
+ port->elem.out_num, 1);
+
+ /*
+ * Port was throttled on source machine. Let's
+ * unthrottle it here so data starts flowing again.
+ */
+ virtio_serial_throttle_port(port, false);
+ }
+ }
}
return 0;
}
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
{
- VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
- VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
+ VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
monitor_printf(mon, "%*s dev-prop-int: id: %u\n",
indent, "", port->id);
port = find_port_by_id(vser, port_id);
/* Flush out any unconsumed buffers first */
- flush_queued_data(port, true);
+ discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
}
static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
{
- VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
+ VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev, base);
- VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus);
int ret;
bool plugging_port0;
return -1;
}
- dev->info = info;
- ret = info->init(dev);
+ port->info = info;
+ ret = info->init(port);
if (ret) {
return ret;
}
port->guest_connected = true;
}
+ port->elem.out_num = 0;
+
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
port->ivq = port->vser->ivqs[port->id];
port->ovq = port->vser->ovqs[port->id];
static int virtser_port_qdev_exit(DeviceState *qdev)
{
- VirtIOSerialDevice *dev = DO_UPCAST(VirtIOSerialDevice, qdev, qdev);
- VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
+ VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
VirtIOSerial *vser = port->vser;
remove_port(port->vser, port->id);
QTAILQ_REMOVE(&vser->ports, port, next);
if (port->info->exit)
- port->info->exit(dev);
+ port->info->exit(port);
return 0;
}
qdev_register(&info->qdev);
}
-VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
+VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
{
VirtIOSerial *vser;
VirtIODevice *vdev;
- uint32_t i;
+ uint32_t i, max_supported_ports;
- if (!max_nr_ports)
+ if (!conf->max_virtserial_ports)
return NULL;
+ /* Each port takes 2 queues, and one pair is for the control queue */
+ max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1;
+
+ if (conf->max_virtserial_ports > max_supported_ports) {
+ error_report("maximum ports supported: %u", max_supported_ports);
+ return NULL;
+ }
+
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
sizeof(struct virtio_console_config),
sizeof(VirtIOSerial));
vser->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 *));
+ vser->bus->max_nr_ports = conf->max_virtserial_ports;
+ vser->ivqs = qemu_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
+ vser->ovqs = qemu_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
/* Add a queue for host to guest transfers for port 0 (backward compat) */
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input);
/* Add a queue for guest to host transfers for port 0 (backward compat) */
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output);
+ /* TODO: host to guest notifications can get dropped
+ * if the queue fills up. Implement queueing in host,
+ * this might also make it possible to reduce the control
+ * queue size: as guest preposts buffers there,
+ * this will save 4Kbyte of guest memory per entry. */
+
/* control queue: host to guest */
- vser->c_ivq = virtio_add_queue(vdev, 16, control_in);
+ vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
/* control queue: guest to host */
- vser->c_ovq = virtio_add_queue(vdev, 16, control_out);
+ 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->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
}
- vser->config.max_nr_ports = max_nr_ports;
- vser->ports_map = qemu_mallocz((max_nr_ports + 31) / 32);
+ vser->config.max_nr_ports = conf->max_virtserial_ports;
+ vser->ports_map = qemu_mallocz(((conf->max_virtserial_ports + 31) / 32)
+ * sizeof(vser->ports_map[0]));
/*
* Reserve location 0 for a console port for backward compat
* (old kernel, new qemu)
vser->vdev.get_config = get_config;
vser->vdev.set_config = set_config;
+ vser->qdev = dev;
+
/*
* Register for the savevm section with the virtio-console name
* to preserve backward compat
*/
- register_savevm("virtio-console", -1, 2, virtio_serial_save,
+ register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save,
virtio_serial_load, vser);
return vdev;
}
+
+void virtio_serial_exit(VirtIODevice *vdev)
+{
+ VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
+
+ unregister_savevm(vser->qdev, "virtio-console", vser);
+
+ qemu_free(vser->ivqs);
+ qemu_free(vser->ovqs);
+ qemu_free(vser->ports_map);
+
+ virtio_cleanup(vdev);
+}
projects / qemu.git / blobdiff