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

[Michael S. Tsirkin]

On Mon, Jun 08, 2015 at 06:28:23PM +0300, Gal Hammer wrote:
> 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.

I agree. And IMHO at this early stage, neither should libvirt without
an explicit request.

-- 
MST