[Qemu-devel] [PATCH 15/15] virtio-serial: do not perform bus reset by hand

[Paolo Bonzini <pbonzini@redhat.com>]

Implement guest_reset as a bus-level reset callback.  Then, the qdev
and virtio core will call it when needed every time the device is
reset or the status field is set to 0.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/virtio-serial-bus.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 155da58..1564482 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -532,12 +532,13 @@ static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
     memcpy(&config, config_data, sizeof(config));
 }
 
-static void guest_reset(VirtIOSerial *vser)
+static int virtser_bus_reset(BusState *qbus)
 {
+    VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qbus);
     VirtIOSerialPort *port;
     VirtIOSerialPortClass *vsc;
 
-    QTAILQ_FOREACH(port, &vser->ports, next) {
+    QTAILQ_FOREACH(port, &bus->vser->ports, next) {
         vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
         if (port->guest_connected) {
             port->guest_connected = false;
@@ -546,6 +547,7 @@ static void guest_reset(VirtIOSerial *vser)
                 vsc->guest_close(port);
         }
     }
+    return 0;
 }
 
 static void set_status(VirtIODevice *vdev, uint8_t status)
@@ -566,17 +568,6 @@ static void set_status(VirtIODevice *vdev, uint8_t status)
          */
         port->guest_connected = true;
     }
-    if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
-        guest_reset(vser);
-    }
-}
-
-static void vser_reset(VirtIODevice *vdev)
-{
-    VirtIOSerial *vser;
-
-    vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
-    guest_reset(vser);
 }
 
 static void virtio_serial_save(QEMUFile *f, void *opaque)
@@ -766,6 +757,7 @@ static void virtser_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
     k->print_dev = virtser_bus_dev_print;
+    k->reset = virtser_bus_reset;
 }
 
 static const TypeInfo virtser_bus_info = {
@@ -985,7 +977,6 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
     vser->vdev.get_config = get_config;
     vser->vdev.set_config = set_config;
     vser->vdev.set_status = set_status;
-    vser->vdev.reset = vser_reset;
 
     vser->qdev = dev;
 
-- 
1.8.0.2