[Xen-devel] xend deprecation [Was: Re: [PATCH] xend: handle extended PCI configuration space when saving state]

[Matt Wilson <msw@xxxxxxxxx>]

On Mon, Sep 02, 2013 at 10:53:25AM +0100, George Dunlap wrote:
> 
> Do you guys have plans for a migration over to xl?  xend has been
> deprecated for two release cycles now, and I personally think 4.4 is a
> good time to put it out of its misery.

Work is underway, but there's lots to do to make that change. Making
the xend build optional in 4.4 is the first step, but I don't think we
should start removing it altogether yet.

> If there is xend functionality you use which is missing from libxl, we
> need to know so that we can re-implement it.

We'll need another sweep to verify that xl sets up everything in a way
that's compatible with all the OS images that run in EC2. E.g., other
problems like:
  http://lists.xen.org/archives/html/xen-devel/2013-04/msg02362.html

We'll need to look closely at the xenstore permissions for any
problems like XSA-57.

Live migration between a system running xend to a system that doesn't
support xend would be a nice-to-have. That probably means some support
for SXP parsing either in libxl or in some compatibility tool.

--msw


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