Re: [Xen-devel] Design Session report: Toolstacks

[George Dunlap <George.Dunlap@xxxxxxxxxx>]

> On Jul 15, 2019, at 6:57 PM, Amit Shah <amit@xxxxxxxxxxxxx> wrote:
> 
> On Mon, 2019-07-15 at 14:59 +0100, George Dunlap wrote:
>> Looking through the notes, it seems like the first part of this
>> discussion, re hypervisor upgrade / downgrade & libraries, was partly
>> covered in the distro session, in which Debian's Xen version co-
>> install
>> was discussed and found useful even if we had a hypervisor , Ian
>> Jackson
>> agreed to post Debian's co-install patches.
> 
> Yea.
> 
> That's also useful for the live-update project, where we want to (in
> the future) use the userspace tools and libraries depending on which
> Xen version is in use at a time.

Just to clarify — seems I had an editing fail above; it should have said, “even 
if we had a stable ABI between the hypervisor and the tools”.  In that case, 
upgrading to a newer version of Xen but remaining on the same userspace tools 
should continue to work, and so having multiple versions should be less of an 
issue (as I presume you’d be unlikely to downgrade in a live update).

But versioned subdirectories and symlinks is definitely something worth doing.

 -George

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