1 files changed, 184 insertions, 0 deletions
diff --git a/hw/char/virtio-console.c b/hw/char/virtio-console.c
new file mode 100644
index 0000000000..31f672c9a3
--- /dev/null
+++ b/hw/char/virtio-console.c
@@ -0,0 +1,184 @@
+/*
+ * 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 "char/char.h"
+#include "qemu/error-report.h"
+#include "trace.h"
+#include "hw/virtio/virtio-serial.h"
+
+typedef struct VirtConsole {
+    VirtIOSerialPort port;
+    CharDriverState *chr;
+} VirtConsole;
+
+/*
+ * Callback function that's called from chardevs when backend becomes
+ * writable.
+ */
+static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
+                                    void *opaque)
+{
+    VirtConsole *vcon = opaque;
+
+    virtio_serial_throttle_port(&vcon->port, false);
+    return FALSE;
+}
+
+/* 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) {
+        VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
+
+        /*
+         * 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.
+         */
+        ret = 0;
+        if (!k->is_console) {
+            virtio_serial_throttle_port(port, true);
+            qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked,
+                                  vcon);
+        }
+    }
+    return ret;
+}
+
+/* Callback function that's called when the guest opens/closes the port */
+static void set_guest_connected(VirtIOSerialPort *port, int guest_connected)
+{
+    VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+
+    if (!vcon->chr) {
+        return;
+    }
+    qemu_chr_fe_set_open(vcon->chr, guest_connected);
+}
+
+/* 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) {
+        vcon->chr->explicit_fe_open = 1;
+        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->set_guest_connected = set_guest_connected;
+    dc->props = virtconsole_properties;
+}
+
+static const 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->set_guest_connected = set_guest_connected;
+    dc->props = virtserialport_properties;
+}
+
+static const 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)