Re: [Qemu-devel] [PATCH v2 4/6] Use libuuid if available.

[Jamie Lokier]

Gleb Natapov wrote:
> > I don't remember hearing an answer on why this is necessary. For which  
> > use case can't you just either use -uuid `uuidgen` or a hardcoded  
> > default value like the Slirp IPv4 subnet?
> It can be used for UUID generation when VM is started for the first time.
> Management application can retrieve UUID using monitor and use it for
> consequent runs. But the same result can be achieved in a different way
> too. So no, I really don't have a strong use case for this feature, but
> the patch set is organised in such way that it is possible to ignore
> this particular patch.

Yeah, but Management Application is often not used.

QEMU's philosophy seems to be that it should be quite usable from the
command line, and leaving _off_ options should give sane defaults.

My immediate thought is that UUID would make sense at disk image
generation time - i.e. stored in qcow2 when qemu-img runs - until such
time as QEMU has a useful config/state file format.  Then it should go
in that file, just like all other VM systems.

-- Jamie