Re: [Qemu-devel] [PATCH V15 4/5] i386: add a Virtual Machine Generation ID device

[Gal Hammer <ghammer@redhat.com>]

On 08/06/2015 18:22, Michael S. Tsirkin wrote:
> On Mon, Jun 08, 2015 at 05:17:31PM +0200, Paolo Bonzini wrote:
>>
>>
>> On 08/06/2015 17:01, Michael S. Tsirkin wrote:
>>> Are there applications that would actually use this?  For microsoft this
>>> seems to be mostly driven by ActiveDirectory needs.
>>> It seems quite possible that applications solve the problem
>>> differently on Linux.
>>
>> I'm not aware of a different solution to the problem on Linux.
>>
>> Paolo
>
> Adding it by default for everyone still seems too aggressive.
> We had a ton of pain with pvpanic exactly because of a
> similar "can't hurt" approach.
>
> I think a better approach would be to merge the code in qemu,
> merge a linux driver. Once that's available, and some apps use it,
> enabling it by default will seem more reasonable.
>

You should not enable it by default. It should be left for the 
management system to decide. QEmu by itself can't follow rules/spec on 
when to change the UUID.

     Gal.