1: NOP out most XPTI entry/exit code when it's not in use
2: disable XPTI when RDCL_NO
3: x86: log XPTI enabled status
4: use %r12 to write zero into xen_cr3
5: reduce .text.entry
6: enable interrupts earlier with XPTI disabled
7: also NOP out xen_cr3 restores of XPTI
8: avoid double CR3 reload when switching to guest user mode

Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
v4: Main change is the split of patch 1.


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