[Qemu-devel] [PATCH] virtio-serial-bus: Unset guest_connected at reset and driver reset

[Amit Shah]

When a guest driver resets the virtio status to not ready, or when qemu
is reset, reset all ports' guest_connected bit and let port users know
of this event if they have the guest_close() callback registered.

Reviewed-by: Alon Levy <address@hidden>
Signed-off-by: Amit Shah <address@hidden>
---
Fix style acc. to mst's comments (but slightly differently).  Does this
look good?

 hw/virtio-serial-bus.c |   36 +++++++++++++++++++++++++++++++++---
 1 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 796224b..9e8d7bb 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -528,16 +528,37 @@ static void set_config(VirtIODevice *vdev, const uint8_t 
*config_data)
     memcpy(&config, config_data, sizeof(config));
 }
 
+static void guest_reset(VirtIOSerial *vser)
+{
+    VirtIOSerialPort *port;
+    VirtIOSerialPortClass *vsc;
+
+    QTAILQ_FOREACH(port, &vser->ports, next) {
+        vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
+        if (port->guest_connected) {
+            port->guest_connected = false;
+
+            if (vsc->guest_close) {
+                vsc->guest_close(port);
+            }
+        }
+    }
+}
+
 static void set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIOSerial *vser;
     VirtIOSerialPort *port;
 
     vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
-    port = find_port_by_id(vser, 0);
 
-    if (port && !use_multiport(port->vser)
-        && (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+    if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        guest_reset(vser);
+        return;
+    }
+
+    port = find_port_by_id(vser, 0);
+    if (port && !use_multiport(port->vser)) {
         /*
          * Non-multiport guests won't be able to tell us guest
          * open/close status.  Such guests can only have a port at id
@@ -548,6 +569,14 @@ static void set_status(VirtIODevice *vdev, uint8_t status)
     }
 }
 
+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)
 {
     VirtIOSerial *s = opaque;
@@ -918,6 +947,7 @@ 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;
 
-- 
1.7.7.6