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Date: Tue, 08 Feb 2011 01:44:32 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: new->old version migration
References: <20110207160751.GC25106@redhat.com>	<4D504925.3000807@codemonkey.ws>	<20110207195315.GA28096@redhat.com>	<4D505C92.5040904@codemonkey.ws>	<20110207215203.GA28658@redhat.com>	<4D50A90C.1060701@codemonkey.ws>	<20110208064214.GB28096@redhat.com>
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To: Amit Shah <amit.shah@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>, Juan Quintela <quintela@redhat.com>, qemu list <qemu-devel@nongnu.org>, "Michael S. Tsirkin" <mst@redhat.com>

On 02/08/2011 01:07 AM, Amit Shah wrote:
> On (Tue) 08 Feb 2011 [08:42:14], Michael S. Tsirkin wrote:
>    
>> I see. I'm unhappy with the facts that
>> 1. if (feature) is spread all over the code instead
>>     of just in migration
>> 2. it is also obfuscated with if (flow_control)
>>     instead of plain if (migrate to qemu<  0.14)
>>     so removing it will be much harder
>> 3. this forces anyone who wants
>>     a VM compatible with qemu 0.13 to also lose data,
>>     even if migration to 0.13 is never attempted.
>>      
> If a machine is started with -M pc-0.13 then we can safely assume the
> user will want to migrate to another 0.13 machine.
>    

No, a user wants a guest that works.  If there was a bug in 0.13 and 
it's fixed in 0.14, then reintroducing the bug in -M pc-0.13 is not 
expected.

Regards,

Anthony Liguori