On Thu, Jul 05, 2018 at 04:20:33PM +0200, Laszlo Ersek wrote: > QEMU does the right thing. If other hypervisors don't do this -- while > still taking and displaying the value in UUID / GUID textual format --, > they are wrong. The VMGENID spec from Microsoft > <http://go.microsoft.com/fwlink/?LinkId=260709> specifically mentions > "GUID".
The MSFT spec does mention GUID, but it seems to me that it's only using GUID as an incidental example -- ie. that you might use the VM Generation ID to generate a GUID. Outside that example it consistently refers to the VM Gen ID as a 128-bit integer. It also says that it could be used as a "high entropy random data source", which is not in fact true if it's a UUID. It has to be said that after reading the spec again [the MSFT spec, not qemu's spec] and what other hypervisors are doing, I'm not sure qemu is doing the right thing here. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org
