On 11/15/2010 02:53 PM, Stefan Hajnoczi wrote:
vhost has a solution for this: register a VMChangeStateHandler function that stops ioeventfd while vm_stop(0) is in effect. Then poll to see if there is work pending. I will add equivalent functionality to virtio-ioeventfd.
I still think that stopping this at the net/block layer is going to be a lot more robust in the long term. All net/block traffic flows through a single set of interfaces whereas getting the devices to completely stop themselves requires touching every device and making sure that noone adds back vmstop-unfriendly behavior down the road.
Regards, Anthony Liguori
Stefan
