[PATCH 0/3] tracing vs CR2

[root]

Hi,

Eiichi-san re-discovered the bug earlier found by He Zhe which we've failed to
fix due to getting distracted by discussing how to untangle entry_64.S.

These 3 patches are basically a completion of the initial approach I suggested
in that earlier thread:

  https://lkml.kernel.org/r/20190320221534.165ab87b@xxxxxxxxxxxxxxxx

Yes, idtentry is a mess, and this doesn't help, but lets fix this now before
someone else trips over it.

This boots on x86_64 and builds on i386 so it must be perfect. No Xen testing
what so ever, because I wouldn't know where to begin.