[libvirt] [PATCH 0/2] Avoid touching monitor when fetching guest XML or info

[Daniel P. Berrange]

The virDomainGetXMLDesc and virDomainGetInfo APIs for QEMU suffer
from needing to run 'query-balloon' to update the balloon level.
This has caused us performance problems and even worse caused us
to lock up on a dead QEMU.

The following two patches to QEMU add a BALLOON_EVENT and a query-events
command to QMP. With those two parts, we can avoiding running the
query-balloon command at all.

https://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02215.html
https://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02255.html