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[Xen-devel] [PATCH 0/4] x86: reduce Meltdown band-aid overhead a little further

Prereq: x86: slightly reduce Meltdown band-aid overhead

The overall effect of this series is smaller than that of the single
patch above (up to 1% in my measurements, but again instead
of the almost 40% loss of performance George has seen that
system showed a 10-13% decline "only"), but perhaps still worth

1: remove CR reads from exit-to-guest path
2: eliminate most XPTI entry/exit code when it's not in use
3: re-organize toggle_guest_*()
4: avoid double CR3 reload when switching to guest user mode

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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