JEP: 342: Limit Speculative Execution

White, Derek Derek.White at
Tue Nov 20 21:42:43 UTC 2018

Hi Jesper,

[Sorry for the "timely" response.]

Although the mechanisms for managing and identifying an alternative JVM are not platform-specific, the mitigation strategy proposed (e.g. the specific gcc options) are x86-specific.

I suggest adding a note in the JEP that the specific mitigations proposed are x86 specific, and that other ports will need to identify what mitigations are appropriate (if any).

I'll start up a discussion in the aarch64 list on what we should do about limiting speculative execution, and we may link aarch64-specific enhancements to this JEP.  This needs to be looked at for both C++ options and JIT implementation on aarch64.


 - Derek

> -----Original Message-----
> From: jdk-dev <jdk-dev-bounces at> On Behalf Of
> mark.reinhold at
> Sent: Friday, September 07, 2018 1:53 PM
> To: jesper.wilhelmsson at
> Cc: jdk-dev at
> Subject: New candidate JEP: 342: Limit Speculative Execution
> External Email
> - Mark

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