[Qemu-devel] [PATCH 2/3] virtio-9p: add unrealize handler

[Greg Kurz]

If the user tries to hot unplug a virtio-9p device, it seems to succeed but
in fact:
- virtio-9p coroutines thread pool and async queue are leaked
- QEMU crashes in virtio_vmstate_change() if the user tries to live migrate

This patch brings hot unplug support to virtio-9p-device. It fixes both
above issues.

Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com>
---
 hw/9pfs/virtio-9p-device.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 93a407c45926..ed133c40493a 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -138,6 +138,17 @@ out:
     v9fs_path_free(&path);
 }
 
+static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    V9fsState *s = VIRTIO_9P(dev);
+
+    v9fs_release_worker_threads();
+    g_free(s->ctx.fs_root);
+    g_free(s->tag);
+    virtio_cleanup(vdev);
+}
+
 /* virtio-9p device */
 
 static Property virtio_9p_properties[] = {
@@ -154,6 +165,7 @@ static void virtio_9p_class_init(ObjectClass *klass, void 
*data)
     dc->props = virtio_9p_properties;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
     vdc->realize = virtio_9p_device_realize;
+    vdc->unrealize = virtio_9p_device_unrealize;
     vdc->get_features = virtio_9p_get_features;
     vdc->get_config = virtio_9p_get_config;
 }