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[Xen-devel] [PATCH v2 0/7] x86: Meltdown band-aid overhead reduction

1: slightly reduce Meltdown band-aid overhead
2: remove CR reads from exit-to-guest path
3: introduce altinstruction_nop assembler macro
4: NOP out most XPTI entry/exit code when it's not in use
5: avoid double CR3 reload when switching to guest user mode
6: disable XPTI when RDCL_NO
7: x86: log XPTI enabled status

I won't mind if it was decided for some of them to be pointless, but I
think 1 (because of a measurable improvement of 1-3%), 4 (helping
the "xpti=no" case, even if only a little; taking 3 as prereq), and
6+7 should be considered seriously.

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

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