This patch adds generic serial ports over the virtio serial bus.
These ports have a few more options that are not relevant for
virtio console ports: the ability to cache buffers that are
received for a port while it's disconnected, setting of limits
to the bytes that are cached so as to prevent OOM conditions,
etc.
Sample uses for such a device can be obtaining info from the
guest like the file systems used, apps installed, etc. for
offline usage and logged-in users, clipboard copy-paste, etc.
for online usage.
For requirements, use-cases, test cases and some history see
http://www.linux-kvm.org/page/VMchannel_Requirements
Signed-off-by: Amit Shah <amit.s...@redhat.com>
---
hw/virtio-console.c | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index b2e4eb1..fc0c239 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -119,3 +119,40 @@ static void virtcon_register(void)
virtio_serial_port_qdev_register(&virtcon_info);
}
device_init(virtcon_register)
+
+
+/* Generic Virtio Serial Ports */
+static int virtserial_port_initfn(VirtIOSerialDevice *dev)
+{
+ VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
+ VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+
+ port->info = dev->info;
+
+ if (vcon->chr) {
+ qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
+ vcon);
+ }
+ return 0;
+}
+
+static VirtIOSerialPortInfo virtserial_port_info = {
+ .qdev.name = "virtserialport",
+ .qdev.size = sizeof(VirtConsole),
+ .init = virtserial_port_initfn,
+ .exit = vcon_exitfn,
+ .have_data = flush_buf,
+ .qdev.props = (Property[]) {
+ DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+ DEFINE_PROP_STRING("name", VirtConsole, port.name),
+ DEFINE_PROP_INT32("cache_buffers", VirtConsole, port.cache_buffers, 1),
+ DEFINE_PROP_UINT64("byte_limit", VirtConsole, port.byte_limit, 0),
+ DEFINE_PROP_END_OF_LIST(),
+ },
+};
+
+static void virtserial_port_register(void)
+{
+ virtio_serial_port_qdev_register(&virtserial_port_info);
+}
+device_init(virtserial_port_register)
--
1.6.2.5
