Most frontends can't really determine if the guest actually has the frontend side open. So lets automatically generate fe_open / fe_close as soon as a frontend becomes ready (as signalled by calling qemu_chr_add_handlers) / becomes non ready (as signalled by setting all handlers to NULL). And allow frontends which can actually determine if the guest is listening to opt-out of this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Message-id: 1364292483-16564-5-git-send-email-hdegoede@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
198 lines
5.2 KiB
C
198 lines
5.2 KiB
C
/*
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* Virtio Console and Generic Serial Port Devices
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*
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* Copyright Red Hat, Inc. 2009, 2010
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*
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* Authors:
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* Amit Shah <amit.shah@redhat.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 "char/char.h"
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#include "qemu/error-report.h"
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#include "trace.h"
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#include "hw/virtio-serial.h"
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typedef struct VirtConsole {
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VirtIOSerialPort port;
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CharDriverState *chr;
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} VirtConsole;
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/*
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* Callback function that's called from chardevs when backend becomes
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* writable.
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*/
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static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
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void *opaque)
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{
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VirtConsole *vcon = opaque;
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virtio_serial_throttle_port(&vcon->port, false);
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return FALSE;
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}
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/* Callback function that's called when the guest sends us data */
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static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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ssize_t ret;
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if (!vcon->chr) {
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/* If there's no backend, we can just say we consumed all data. */
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return len;
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}
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ret = qemu_chr_fe_write(vcon->chr, buf, len);
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trace_virtio_console_flush_buf(port->id, len, ret);
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if (ret <= 0) {
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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/*
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* Ideally we'd get a better error code than just -1, but
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* that's what the chardev interface gives us right now. If
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* we had a finer-grained message, like -EPIPE, we could close
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* this connection.
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*/
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ret = 0;
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if (!k->is_console) {
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virtio_serial_throttle_port(port, true);
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qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked,
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vcon);
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}
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}
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return ret;
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}
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/* Callback function that's called when the guest opens the port */
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static void guest_open(VirtIOSerialPort *port)
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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if (!vcon->chr) {
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return;
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}
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qemu_chr_fe_open(vcon->chr);
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}
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/* Callback function that's called when the guest closes the port */
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static void guest_close(VirtIOSerialPort *port)
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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if (!vcon->chr) {
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return;
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}
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qemu_chr_fe_close(vcon->chr);
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}
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/* Readiness of the guest to accept data on a port */
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static int chr_can_read(void *opaque)
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{
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VirtConsole *vcon = opaque;
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return virtio_serial_guest_ready(&vcon->port);
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}
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/* Send data from a char device over to the guest */
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static void chr_read(void *opaque, const uint8_t *buf, int size)
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{
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VirtConsole *vcon = opaque;
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trace_virtio_console_chr_read(vcon->port.id, size);
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virtio_serial_write(&vcon->port, buf, size);
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}
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static void chr_event(void *opaque, int event)
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{
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VirtConsole *vcon = opaque;
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trace_virtio_console_chr_event(vcon->port.id, event);
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switch (event) {
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case CHR_EVENT_OPENED:
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virtio_serial_open(&vcon->port);
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break;
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case CHR_EVENT_CLOSED:
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virtio_serial_close(&vcon->port);
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break;
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}
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}
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static int virtconsole_initfn(VirtIOSerialPort *port)
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
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if (port->id == 0 && !k->is_console) {
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error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
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return -1;
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}
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if (vcon->chr) {
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vcon->chr->explicit_fe_open = 1;
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qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
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vcon);
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}
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return 0;
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}
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static Property virtconsole_properties[] = {
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void virtconsole_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
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k->is_console = true;
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k->init = virtconsole_initfn;
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k->have_data = flush_buf;
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k->guest_open = guest_open;
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k->guest_close = guest_close;
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dc->props = virtconsole_properties;
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}
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static const TypeInfo virtconsole_info = {
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.name = "virtconsole",
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.parent = TYPE_VIRTIO_SERIAL_PORT,
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.instance_size = sizeof(VirtConsole),
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.class_init = virtconsole_class_init,
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};
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static Property virtserialport_properties[] = {
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void virtserialport_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
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k->init = virtconsole_initfn;
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k->have_data = flush_buf;
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k->guest_open = guest_open;
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k->guest_close = guest_close;
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dc->props = virtserialport_properties;
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}
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static const TypeInfo virtserialport_info = {
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.name = "virtserialport",
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.parent = TYPE_VIRTIO_SERIAL_PORT,
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.instance_size = sizeof(VirtConsole),
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.class_init = virtserialport_class_init,
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};
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static void virtconsole_register_types(void)
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{
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type_register_static(&virtconsole_info);
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type_register_static(&virtserialport_info);
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}
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type_init(virtconsole_register_types)
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