Q: Have I seen this crash appear and vanish by accident and is it still
there with VMX flag not set? This uses the code that no more adds the
VMX flag (and due to that doesn't enable it by default)

- qemu64
  - nested can't be used
- qemu64,vmx=on
  - nested can be used
  => Still Crashes!
- kvm64
  - nested can't be used
- kvm64,vmx=on
  - nested can be used
  - does not crash

So qemu64 has a deficiency (as intended by upstream) and is unable to run VMX.
Our former change adding the full VMX just had it set vmx=on in cmdline and due 
to that exposed the bug quicker. We need to identify the bug in qemu64 OR use 
this chance to stop our qemu64 to be different.

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https://bugs.launchpad.net/bugs/1868692

Title:
  default cpu (qemu64) no more capable of nesting

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