From patchwork Tue Dec 22 17:49:06 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3/3] virtio-serial: Add a new virtserialport device for generic serial port support Date: Tue, 22 Dec 2009 07:49:06 -0000 From: Amit Shah X-Patchwork-Id: 41635 Message-Id: <1261504146-26018-4-git-send-email-amit.shah@redhat.com> To: qemu-devel@nongnu.org Cc: Amit Shah , armbru@redhat.com, agraf@suse.de, kraxel@redhat.com 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 --- 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)