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List:       illumos-developer
Subject:    Re: [developer] Intel to disable TSX on Skylake, Coffee Lake
From:       Dale Ghent <daleg () elemental ! org>
Date:       2021-06-29 1:09:29
Message-ID: CEFD6426-A08E-4615-9933-44C8C3B3C4BD () elemental ! org
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> On Jun 28, 2021, at 20:46, Robert Mustacchi <rm@fingolfin.org> wrote:
> 
> Hi Dale,
> 
> When we mitigated TSX Asynchronous Abort, we took advantage of the MSR
> added then to disable TSX and have been doing that on platforms where
> Intel offered the ability to do so via microcode. What appears to be
> happening is they're adding that same MSR to more systems. illumos
> itself does not directly use TSX anywhere. This will only impact users
> with software that was explicitly coded to use TSX and even then said
> software will have to already have a fallback path. If you look at
> cpuid_apply_tsx() that's where we deal with this today.
> 
> In short, this should not really impact most folks.

Cool! Thank you for the explanation.

/dale

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