[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH 1/4] Introduce a new hotplug state: Force eject.



On 05/16/2012 06:23 AM, Paolo Bonzini wrote:
Il 16/05/2012 13:15, Anthony PERARD ha scritto:
         qdev_unplug(&(d->qdev), NULL);
+        qdev_free(&(d->qdev));
     }
  }


Anthony, can you confirm that this solves the problem for you?
This work until I try to hotplug a new device to the guest at wish
point I have this:
ERROR:/local/home/anthony/work/qemu/qom/object.c:389:object_delete:
assertion failed: (obj->ref == 0)

This is because there is still a pending request of the hotunplug in
the acpi piix4.
If I call qdev_free without qdev_unplug, I hit the same assert, but
rigth away. This is way something new.

Because it's missing the object_unparent done by qdev_unplug.  Does
object_unparent+qdev_free work?  (I believe object_unparent should be
done by qdev_free rather than qdev_unplug, but that's something for 1.2).

qdev_free() is trivially object_delete today.

What we should do is make an object_destroy() which emits a destroy event and then decrements the reference count. When ref == 0, we should emit a delete event.

We could then register a slot to object_unparent in the destroy event handler, and then object_new() could register a free handler in the delete event.

Then object_delete()/qdev_free() just become trivial invocations of 
object_unref().

But for 1.1, we definitely should just do an explicit object_unparent().

Regards,

Anthony Liguori


Paolo


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.