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

[Paolo Bonzini]

On 08/06/2015 17:41, Michael S. Tsirkin wrote:
> > > 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.
> 
> Not if libvirt insists on adding a non zero uuid to all VMs
> unconditionally. This is what I was arguing against really.

That would be a libvirt bug.  The VM UUID in SMBIOS and is different
from the vmgenid UUID.

Paolo