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virtio-serial: add plumbing for virtio console emergency write support

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Add the infrastructure required for the virtio 1.0 "emergency write"
(VIRTIO_CONSOLE_F_EMERG_WRITE) feature. Because we don't touch the
size of the configuration area, guests will not be able to actually
make use of this without further patches.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Sascha Silbe 2016-09-27 15:43:36 +02:00 committed by Michael S. Tsirkin
parent 17871f71fd
commit 09da01c3f2
1 changed files with 37 additions and 0 deletions
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37
hw/char/virtio-serial-bus.c
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@ -75,6 +75,19 @@ static VirtIOSerialPort *find_port_by_name(char *name)
return NULL;
}
static VirtIOSerialPort *find_first_connected_console(VirtIOSerial *vser)
{
VirtIOSerialPort *port;
QTAILQ_FOREACH(port, &vser->ports, next) {
VirtIOSerialPortClass const *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
if (vsc->is_console && port->host_connected) {
return port;
}
}
return NULL;
}
static bool use_multiport(VirtIOSerial *vser)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vser);
@ -547,6 +560,29 @@ static void get_config(VirtIODevice *vdev, uint8_t *config_data)
vser->serial.max_virtserial_ports);
}
/* Guest sent new config info */
static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
{
VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
struct virtio_console_config *config =
(struct virtio_console_config *)config_data;
uint8_t emerg_wr_lo = le32_to_cpu(config->emerg_wr);
VirtIOSerialPort *port = find_first_connected_console(vser);
VirtIOSerialPortClass *vsc;
if (!config->emerg_wr) {
return;
}
/* Make sure we don't misdetect an emergency write when the guest
* does a short config write after an emergency write. */
config->emerg_wr = 0;
if (!port) {
return;
}
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
(void)vsc->have_data(port, &emerg_wr_lo, 1);
}
static void guest_reset(VirtIOSerial *vser)
{
VirtIOSerialPort *port;
@ -1098,6 +1134,7 @@ static void virtio_serial_class_init(ObjectClass *klass, void *data)
vdc->unrealize = virtio_serial_device_unrealize;
vdc->get_features = get_features;
vdc->get_config = get_config;
vdc->set_config = set_config;
vdc->set_status = set_status;
vdc->reset = vser_reset;
vdc->save = virtio_serial_save_device;