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

>>> On 07.02.18 at 17:05, <JBeulich@xxxxxxxx> wrote:
> 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

I've updated this one to patch all paths, but I'd like to avoid sending
v3 of the series without having had any feedback on v2 (leaving
aside a tiny bit on patch 1).


> 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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