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hw/virtio: generalise CHR_EVENT_CLOSED handling

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..and use for both virtio-user-blk and virtio-user-gpio. This avoids
the circular close by deferring shutdown due to disconnection until a
later point. virtio-user-blk already had this mechanism in place so
generalise it as a vhost-user helper function and use for both blk and
gpio devices.

While we are at it we also fix up vhost-user-gpio to re-establish the
event handler after close down so we can reconnect later.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <20221130112439.2527228-5-alex.bennee@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2022-11-30 11:24:38 +00:00 • committed by Michael S. Tsirkin
parent 060f4a9440
commit 71e076a07d
4 changed files with 104 additions and 37 deletions
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41
hw/block/vhost-user-blk.c
View file

@ -369,17 +369,10 @@ static void vhost_user_blk_disconnect(DeviceState *dev)
vhost_user_blk_stop(vdev);
vhost_dev_cleanup(&s->dev);
}
static void vhost_user_blk_chr_closed_bh(void *opaque)
{
DeviceState *dev = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserBlk *s = VHOST_USER_BLK(vdev);
vhost_user_blk_disconnect(dev);
/* Re-instate the event handler for new connections */
qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event,
NULL, opaque, NULL, true);
NULL, dev, NULL, true);
}
static void vhost_user_blk_event(void *opaque, QEMUChrEvent event)
@ -398,33 +391,9 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent event)
}
break;
case CHR_EVENT_CLOSED:
if (!runstate_check(RUN_STATE_SHUTDOWN)) {
/*
* A close event may happen during a read/write, but vhost
* code assumes the vhost_dev remains setup, so delay the
* stop & clear.
*/
AioContext *ctx = qemu_get_current_aio_context();
qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, NULL, NULL,
NULL, NULL, false);
aio_bh_schedule_oneshot(ctx, vhost_user_blk_chr_closed_bh, opaque);
/*
* Move vhost device to the stopped state. The vhost-user device
* will be clean up and disconnected in BH. This can be useful in
* the vhost migration code. If disconnect was caught there is an
* option for the general vhost code to get the dev state without
* knowing its type (in this case vhost-user).
*
* FIXME: this is sketchy to be reaching into vhost_dev
* now because we are forcing something that implies we
* have executed vhost_dev_stop() but that won't happen
* until vhost_user_blk_stop() gets called from the bh.
* Really this state check should be tracked locally.
*/
s->dev.started = false;
}
/* defer close until later to avoid circular close */
vhost_user_async_close(dev, &s->chardev, &s->dev,
vhost_user_blk_disconnect);
break;
case CHR_EVENT_BREAK:
case CHR_EVENT_MUX_IN: