Bisection ended on:

commit e504c9098ed6acd9e1079c5e10e4910724ad429f
Author: Anthoine Bourgeois <[email protected]>
Date:   Wed Nov 13 11:45:37 2013 +0100

    kvm, vmx: Fix lazy FPU on nested guest

which sounds reasonable as this will cause an exit to L0 (the host) in
some case where it has not before. I am preparing Trusty kernels with
that patch reverted to verify. Then need to ask upstream whether this
maybe misses a counterpart in L0 handling or has other issues.

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https://bugs.launchpad.net/bugs/1278531

Title:
  nested kvm fails with trusty and upstream kernels

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