Re: [PATCH 4/5] hw/nvme: do not auto-generate uuid

[Christoph Hellwig]

On Tue, Apr 19, 2022 at 02:10:38PM +0200, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Do not default to generate an UUID for namespaces if it is not
> explicitly specified.
> 
> This is a technically a breaking change in behavior. However, since the
> UUID changes on every VM launch, it is not spec compliant and is of
> little use since the UUID cannot be used reliably anyway and the
> behavior prior to this patch must be considered buggy.

So unlike the EUI, UUIDs are designed to be autogenerated even if the
current algorithm is completely broken.  We'd just need to persist them.
Note that NVMe at least in theory requires providing at least on of
the unique identifiers, and the UUID is the only one designed to be
autogenerated in a distributed fashion.