There wasn't a xen commit listed (and we didn't bump the xen version so we 
haven't picked it up by accident).
I'd assume this is a Won't Fix for 18.04 and might appear sometime later.

Is there any xen change to consider (later on) or was xen just
optionally listed but doesn't come to life?

** Changed in: xen (Ubuntu Bionic)
       Status: New => Incomplete

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

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  [FFE][Feature] KVM CLX avx512_vnni

Status in linux package in Ubuntu:
  Fix Committed
Status in qemu package in Ubuntu:
  Fix Released
Status in xen package in Ubuntu:
Status in linux source package in Bionic:
  Fix Committed
Status in qemu source package in Bionic:
  Fix Released
Status in xen source package in Bionic:

Bug description:
  This feature has been released in ICX platform and the definition of 
AVX512_VNNI as below
   AVX512_VNNI Vector Nerual Network Instructions, an addition to AVX512. 
cpuid.(7,0). ECX[11]

  This is a new instruction to support machine learning. This
  instructions is pure HW features, currently, there is no test cases
  for this new instruction, we only check CPUID info by cpuid tool.

  Target Kernel: 4.16
  Target Qemu: 2.12
  Target Release: 18.04

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