Re: [Xen-devel] [PATCH 5/6] libxl: allow a generation ID to be specified at domain creation

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-06-10 at 13:35 +0100, David Vrabel wrote:
> On 10/06/14 12:01, Ian Campbell wrote:
> > On Tue, 2014-06-03 at 14:15 +0100, David Vrabel wrote:
> >> Toolstacks may specify a VM generation ID using the
> >> u.hvm.generation_id field into libxl_domain_build_info structure, when
> >> creating a domain.
> >>
> >> The toolstack is responsible for providing the correct generation ID
> >> according to the Microsoft specification (e.g., generating new random
> >> ones as appropriate when restoring).
> > 
> > Any reason not to make the libxl interface a (def)bool and have libxl
> > generate a suitable ID internally? Does anything ever care about the
> > specific UUID?
> 
> Other toolstacks (like xapi) have a better idea of the life-cycle of a
> VM than xl does and thus need only use a new ID for snapshots -- they
> can retain the same ID if the domain is just rebooted/migrated.

They should set the field to false then and libxl won't regenerate it.

Ian.


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