Re: port-xen/53965: XEN DomU fails to poweroff in new HEAD kernels

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Sat, 9 Feb 2019 19:15:17 +0100
    From:        Manuel Bouyer <bouyer%antioche.eu.org@localhost>
    Message-ID:  <20190209181517.GB3869%antioche.eu.org@localhost>

  | From the commit log you should be able to add
  | options         __XEN_INTERFACE_VERSION__=0x00030201 # Xen 3.1 interface
  |
  | to get the old API/ABI

Tried that (using sources as they are on HEAD) - I still need to
check to verify that everything was recompiled, but from whatching it
fly past, it certainly looked to be, with the -D for that option
included everywhere.

It didn't change anything, the poweroff still did not happen.  After
checking that the build was correct, I'll try using (kernel) sources
from just before the rlevant checkin to verify that it worked immediately 
before, and then see if I can see what particular code change is affecting
things.

Whatever happens, backwards compat is important, we need to find a way
for a standard GENERIC XEN kernel to run (fully, including shutting down)
on whatever version of XEN it happens to find itself booted on.

kre