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Re: [Qemu-devel] [PATCH 2/3] Add migrate -u option for -incoming pause

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 2/3] Add migrate -u option for -incoming pause
Date: Tue, 10 Feb 2015 09:57:36 -0700
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On 02/10/2015 09:47 AM, Daniel P. Berrange wrote:
> On Tue, Feb 10, 2015 at 04:16:38PM +0000, Dr. David Alan Gilbert (git) wrote:
>> From: "Dr. David Alan Gilbert" <address@hidden>
>> Once a qemu has been started with -incoming pause   the

s/pause   the/pause, the/

>> migration can be started by issuing:
>> migrate -u uri
>> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
>> ---
> Hmm, the 'unpause' codepath doesn't really share anything with the existing
> codepath. Also the URIs for the existing migrate command are not quite the
> same as the URIs for the incoming migrate side. This would suggest to me
> that it might be better to have a separate 'migrate-incoming' command in
> the monitor rather than overload the existing 'migrate' command.
> Also having a separate command will make it possible to detect that this
> feature is supported from libvirt, since I don't think QMP introspection
> provides enough info to detect it based on the new arg to existing
> commands.

Agree, a new command for QMP would be better (it serves as both the new
command to use, and the witness that the '-incoming pause:' command line
works).  The HMP 'migrate -u' is just fine, though (it's fine to have a
single HMP command smart enough to call out to two different QMP commands).

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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