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f9a90f189c
After a hot-unplug operation, the previous behaviour was to close the chardev. That meant the chardev couldn't be re-used. Also, since chardev hot-plug isn't possible so far, this means virtio-console hot-plug isn't feasible as well. With this change, the chardev is kept around. A new virtio-console channel can then be hot-plugged with the same chardev and things will continue to work. Signed-off-by: Amit Shah <amit.shah@redhat.com>
149 lines
3.9 KiB
C
149 lines
3.9 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 "qemu-char.h"
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#include "qemu-error.h"
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#include "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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/* 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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return qemu_chr_write(vcon->chr, buf, len);
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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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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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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 generic_port_init(VirtConsole *vcon, VirtIOSerialPort *port)
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{
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if (vcon->chr) {
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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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vcon->port.info->have_data = flush_buf;
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}
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return 0;
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}
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/* Virtio Console Ports */
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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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port->is_console = true;
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return generic_port_init(vcon, port);
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}
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static int virtconsole_exitfn(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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/*
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* Instead of closing the chardev, free it so it can be used
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* for other purposes.
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*/
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qemu_chr_add_handlers(vcon->chr, NULL, NULL, NULL, NULL);
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}
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return 0;
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}
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static VirtIOSerialPortInfo virtconsole_info = {
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.qdev.name = "virtconsole",
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.qdev.size = sizeof(VirtConsole),
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.init = virtconsole_initfn,
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.exit = virtconsole_exitfn,
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.qdev.props = (Property[]) {
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DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1),
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DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_STRING("name", VirtConsole, port.name),
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DEFINE_PROP_END_OF_LIST(),
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},
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};
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static void virtconsole_register(void)
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{
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virtio_serial_port_qdev_register(&virtconsole_info);
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}
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device_init(virtconsole_register)
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/* Generic Virtio Serial Ports */
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static int virtserialport_initfn(VirtIOSerialPort *port)
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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if (port->id == 0) {
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/*
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* Disallow a generic port at id 0, that's reserved for
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* console ports.
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*/
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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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return generic_port_init(vcon, port);
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}
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static VirtIOSerialPortInfo virtserialport_info = {
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.qdev.name = "virtserialport",
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.qdev.size = sizeof(VirtConsole),
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.init = virtserialport_initfn,
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.exit = virtconsole_exitfn,
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.qdev.props = (Property[]) {
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DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_STRING("name", VirtConsole, port.name),
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DEFINE_PROP_END_OF_LIST(),
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},
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};
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static void virtserialport_register(void)
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{
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virtio_serial_port_qdev_register(&virtserialport_info);
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}
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device_init(virtserialport_register)
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