Re: [Qemu-devel] KVM call minutes for Feb 15

[Anthony Liguori <anthony@codemonkey.ws>]

On 02/16/2011 08:39 AM, Amit Shah wrote:
> On (Tue) 15 Feb 2011 [17:13:13], Anthony Liguori wrote:
>    
>> On 02/15/2011 10:26 AM, Chris Wright wrote:
>>      
>>> revisit new ->   old migration
>>> - Amit offers virtio-serial patches and some legwork
>>>        
>> So, to me, migration correctness trumps compatibility.  I don't
>> think compatibility is useful if it means that a guest may fail
>> during migration.  We have subsections as a way to support the cases
>> where it's safe to migrate to an old version only if a feature is
>> not being used or a corner case is not currently happening.  This is
>> the best way to approach the problem.
>>
>> If a subsection won't work, that means you want to migrate when
>> you're completely sure that migrating will break a guest.  That
>> doesn't seem reasonable at all to me.
>>
>> I think in the last discussion on Amit's patches, I had suggested
>> that subsections could be used to allow migration when there wasn't
>> any queued data.  I think this is the best we can do while
>> preserving correctness.
>>      
> The only problem is that virtio hasn't been converted over to vmstate,
> which is necessary for subsections.
>    

Then it needs to be converted.

Regards,

Anthony Liguori

> 		Amit
>
>