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

[Gal Hammer]

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.