It would be required for Xen as well if it will be done, but I didn't
hear on Xen in regard to this so I don't know.

SMB might share his opinion on this for xen and he is generally
subscribed to xen so he will see the updates.

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https://bugs.launchpad.net/bugs/1739665

Title:
  [FFE][Feature] KVM CLX avx512_vnni

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

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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