I was able to find the Xen changes which fix the decoding matter. Right
now there is also work needed to work around issues when compiling with
gcc-8 (and gcc-9). I got the compiling side fixed, too. Unfortunately
the result, when compiling with gcc-9, is a non-working hypervisor. In
my tests that just triggers a host reset before even printing any early
boot messages. So right now there is only one way of getting an at least
working solution for Eoan/Focal: to upload into Disco and copy-forward
that (with binaries) to E/F.

** Also affects: xen (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: xen (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: xen (Ubuntu Disco)
   Importance: Undecided => High

** Changed in: xen (Ubuntu Eoan)
   Importance: Undecided => High

** Changed in: xen (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1851091

Title:
  Fresh Eoan upgrade fails to boot dom0 with message "decoding failed"
  (kernel 5.3.0)

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