Re: [Xen-devel] [PATCH 0 of 3] Support for VM generation ID save/restore and migrate

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> Sent: 16 December 2011 13:26
> To: Paul Durrant
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH 0 of 3] Support for VM generation ID
> save/restore and migrate
> 
> On Fri, Dec 16, 2011 at 11:47:26AM +0000, Paul Durrant wrote:
> > This patch series adds support for preservation of the VM
> generation
> > ID buffer address in xenstore across save/restore and migrate, and
> > also code to increment the value in all cases except for
> migration.
> >
> 
> Sorry for a stupid question, but what's the usecase for this
> 'generation ID' ?
> 

Pasi,

  I did mention this before on 1st December. Here's what I said then:

"I already know there is one OS that consumes this interface and another
hypervisor that produces it but unfortunately I'm not at liberty to say
much more because I'm under NDA. Hopefully a spec. will be forthcoming
at some point."

  That really is all I believe I'm at liberty to say :-(

  Paul

> -- Pasi
> 
> > The first patch modifies creation of the hvmloader key in xenstore
> and
> > adds creation of a new read/write hvmloader/generation-id-addr
> key.
> > The second patch changes hvmloader to use the new key (as opposed
> to
> > the old data/generation-id key).
> > The third patch adds the infrastructure to save and restore the VM
> > generation ID address in xenstore and the code to increment the
> value.
> >
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel

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