/* * Virtio Console and Generic Serial Port Devices * * Copyright Red Hat, Inc. 2009, 2010 * * Authors: * Amit Shah <amit.shah@redhat.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. */ #include "qemu-char.h" #include "qemu-error.h" #include "trace.h" #include "virtio-serial.h" typedef struct VirtConsole { VirtIOSerialPort port; CharDriverState *chr; } VirtConsole; /* Callback function that's called when the guest sends us data */ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) { VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); ssize_t ret; if (!vcon->chr) { /* If there's no backend, we can just say we consumed all data. */ return len; } ret = qemu_chr_fe_write(vcon->chr, buf, len); trace_virtio_console_flush_buf(port->id, len, ret); if (ret < 0) { /* * Ideally we'd get a better error code than just -1, but * that's what the chardev interface gives us right now. If * we had a finer-grained message, like -EPIPE, we could close * this connection. Absent such error messages, the most we * can do is to return 0 here. * * This will prevent stray -1 values to go to * virtio-serial-bus.c and cause abort()s in * do_flush_queued_data(). */ ret = 0; } return ret; } /* Callback function that's called when the guest opens the port */ static void guest_open(VirtIOSerialPort *port) { VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); if (!vcon->chr) { return; } qemu_chr_fe_open(vcon->chr); } /* Callback function that's called when the guest closes the port */ static void guest_close(VirtIOSerialPort *port) { VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); if (!vcon->chr) { return; } qemu_chr_fe_close(vcon->chr); } /* Readiness of the guest to accept data on a port */ static int chr_can_read(void *opaque) { VirtConsole *vcon = opaque; return virtio_serial_guest_ready(&vcon->port); } /* Send data from a char device over to the guest */ static void chr_read(void *opaque, const uint8_t *buf, int size) { VirtConsole *vcon = opaque; trace_virtio_console_chr_read(vcon->port.id, size); virtio_serial_write(&vcon->port, buf, size); } static void chr_event(void *opaque, int event) { VirtConsole *vcon = opaque; trace_virtio_console_chr_event(vcon->port.id, event); switch (event) { case CHR_EVENT_OPENED: virtio_serial_open(&vcon->port); break; case CHR_EVENT_CLOSED: virtio_serial_close(&vcon->port); break; } } static int virtconsole_initfn(VirtIOSerialPort *port) { VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port); if (port->id == 0 && !k->is_console) { error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility."); return -1; } if (vcon->chr) { qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, vcon); } return 0; } static Property virtconsole_properties[] = { DEFINE_PROP_CHR("chardev", VirtConsole, chr), DEFINE_PROP_END_OF_LIST(), }; static void virtconsole_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); k->is_console = true; k->init = virtconsole_initfn; k->have_data = flush_buf; k->guest_open = guest_open; k->guest_close = guest_close; dc->props = virtconsole_properties; } static TypeInfo virtconsole_info = { .name = "virtconsole", .parent = TYPE_VIRTIO_SERIAL_PORT, .instance_size = sizeof(VirtConsole), .class_init = virtconsole_class_init, }; static Property virtserialport_properties[] = { DEFINE_PROP_CHR("chardev", VirtConsole, chr), DEFINE_PROP_END_OF_LIST(), }; static void virtserialport_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass); k->init = virtconsole_initfn; k->have_data = flush_buf; k->guest_open = guest_open; k->guest_close = guest_close; dc->props = virtserialport_properties; } static TypeInfo virtserialport_info = { .name = "virtserialport", .parent = TYPE_VIRTIO_SERIAL_PORT, .instance_size = sizeof(VirtConsole), .class_init = virtserialport_class_init, }; static void virtconsole_register_types(void) { type_register_static(&virtconsole_info); type_register_static(&virtserialport_info); } type_init(virtconsole_register_types)