[MODERATED] Re: [PATCH v7 10/10] TAAv7 10

On Tue, Oct 22, 2019 at 01:39:20PM -0500, speck for Josh Poimboeuf wrote:
> Regardless, this patch adds complexity and still seems very fragile.  It
> will add maintenance issues and probably introduce bugs.  And, most
> importantly there's *still* not a real world justification for it.
> Please drop it from the series.

Yeah, and here's nasty use case if we did the runtime toggle thing: you
boot with TSX on, start guests, they see TSX and start using it and then
you disable it in the host.

I believe I read somewhere Andrew saying it won't #UD but it would abort
all transactions, which is still not nice and leaves the burden on the
sysadmin explaining why guests experience perf penatly all of a sudden.

Not good.

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    Boris.

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