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Re: [Qemu-devel] [RFC PATCH 0/5] asynchronous migration state change han

From: Anthony Liguori
Subject: Re: [Qemu-devel] [RFC PATCH 0/5] asynchronous migration state change handlers
Date: Tue, 05 Jun 2012 19:59:26 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

On 06/05/2012 01:49 PM, Yonit Halperin wrote:

I'm sending this patch series again. This time with an additional patch
for setting a migrate_end notifier completion callback for spice migration
interface. I've also added more detailed commit messages.

This patch series introduces async handlers for notifiers, and integrates them
with migration state change notifications.

Asynchronous migration completion notifier is essential for allowing spice to 
complete the src server connection to the client, and transfer the connection 
to the target.
Currently, as soon as the migration completes, the src qemu can be closed by the
management, and spice cannot complete the spice-connection migration.

In order to support spice seamless migration, next to these patches, I plan to 
(1) notifier for switching from the live phase of the migration to the non-live 
     before completing savevm.
     Spice will use this notification to "finalize" the connection to the 
client: send
     and receive all in-flight data.

Absolutely not.  This is hideously ugly and affects a bunch of code.

Spice is *not* getting a hook in migration where it gets to add arbitrary amounts of downtime to the migration traffic. That's a terrible idea.

I'd like to be more constructive in my response, but you aren't explaining the problem well enough for me to offer an alternative solution. You need to find another way to solve this problem.


Anthony Liguori

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