From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:49539)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1VJP5H-0000C0-Jh
	for qemu-devel@nongnu.org; Tue, 10 Sep 2013 10:38:33 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1VJP5B-0002mr-KV
	for qemu-devel@nongnu.org; Tue, 10 Sep 2013 10:38:27 -0400
Received: from mx1.redhat.com ([209.132.183.28]:39422)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1VJP5B-0002ml-Cp
	for qemu-devel@nongnu.org; Tue, 10 Sep 2013 10:38:21 -0400
Message-ID: <522F2EDD.2070005@redhat.com>
Date: Tue, 10 Sep 2013 16:38:21 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
MIME-Version: 1.0
References: <1378784607-7398-1-git-send-email-junqing.wang@cs2c.com.cn>
	<1378784607-7398-3-git-send-email-junqing.wang@cs2c.com.cn>
	<87eh8weq48.fsf@elfo.elfo> <522F188B.7040808@redhat.com>
	<87mwnkd44e.fsf@elfo.elfo>
In-Reply-To: <87mwnkd44e.fsf@elfo.elfo>
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH RFC 2/4] Curling: cmdline interface
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: quintela@redhat.com
Cc: stefanha@redhat.com, owasserm@redhat.com, Jules Wang <junqing.wang@cs2c.com.cn>, qemu-devel@nongnu.org

Il 10/09/2013 18:37, Juan Quintela ha scritto:
>> I think for the outgoing side it should just be "migrate -f tcp:foo:9999".
>>
>> On the incoming side, perhaps you could have a different ID instead of
>> QEMU_VM_FILE_MAGIC, that triggers fault-tolerance mode automatically?
>> Then again it would be simply "-incoming tcp:foo:9999".
> 
> Then how can you distingish between faultolerance and simple migration?
> You need to diferentiate on both sides.
> 
> - outgoing side: you need to continue running after sending the whole
>   state
> - incoming side: after receivinga lot,  you apply it,  and have to wait
>   for the next one.
> 
> It is a different thing to do,  we need to tell qemu somehow.

You look at the first 4 bytes in the stream and distinguish the two cases.

Paolo