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

[Michael S. Tsirkin]

On Mon, Jun 08, 2015 at 05:33:19PM +0200, Paolo Bonzini wrote:
> 
> 
> On 08/06/2015 17:22, 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.
> > 
> > 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.  
> 
> The ton of pain was due to enabling it in ACPI unconditionally.  We can
> leave it disabled in the UUID is all zeroes, for example.
> 
> Paolo

Not if libvirt insists on adding a non zero uuid to all VMs
unconditionally. This is what I was arguing against really.

> > 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.
> >