Re: [Xen-devel] [PATCH] x86/save: reserve HVM save record numbers that have been consumed...

["Durrant, Paul" <pdurrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Andrew Cooper
> Sent: 18 December 2019 19:45
> To: Durrant, Paul <pdurrant@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Wei Liu <wl@xxxxxxx>; Jan Beulich <jbeulich@xxxxxxxx>; Roger Pau Monné
> <roger.pau@xxxxxxxxxx>
> Subject: Re: [Xen-devel] [PATCH] x86/save: reserve HVM save record numbers
> that have been consumed...
> 
> On 18/12/2019 16:09, Paul Durrant wrote:
> > ...for patches not (yet) upstream.
> >
> > This patch is simply reserving save record number space to avoid the
> > risk of clashes between existent downstream changes made by Amazon and
> > future upstream changes which may be incompatible.
> >
> > Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> Is this "you've already used some of these", or you plan to?

Already used in code that has been deployed, although I have left some headroom 
because I know there is code in development which is using new ones.

Where records can be upstreamed in a way that is compatible with downstream 
use, we will keep the existing number. If incompatible changes are necessary to 
get the code upstream then we will have to use a new number and maintain 
downstream compatibility patches.

  Paul

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