RFR: JDK-8202384: Introduce altserver jvm variant with speculative execution disabled

Daniel D. Daugherty daniel.daugherty at oracle.com
Fri Jun 8 21:53:19 UTC 2018

On 6/8/18 5:50 PM, Erik Joelsson wrote:
> On 2018-06-07 17:30, David Holmes wrote:
>> On 8/06/2018 6:11 AM, Erik Joelsson wrote:
>>> I just don't think the extra work is warranted or should be 
>>> prioritized at this point. I also cannot think of a combination of 
>>> options required for what you are suggesting that wouldn't be 
>>> confusing to the user. If someone truly feels like these flags are 
>>> forced on them and can't live with them, we or preferably that 
>>> person can fix it then. I don't think that's dictatorship. OpenJDK 
>>> is still open source and anyone can contribute.
>> I don't see why --enable-hardened-jdk and --enable-hardened-hotspot 
>> to add to the right flags would be either complicated or confusing.
> For me the confusion surrounds the difference between 
> --enable-hardened-hotspot and --with-jvm-variants=server, hardened and 
> making the user understand it. But sure, it is doable. Here is a new 
> webrev with those two options as I interpret them. Here is the help text:
>  --enable-hardened-jdk   enable hardenening compiler flags for all jdk

Typo: 'hardenening' -> 'hardening'

> libraries (except the JVM), typically disabling
>                           speculative cti. [disabled]
>  --enable-hardened-hotspot
>                           enable hardenening compiler flags for 
> hotspot (all

Typo: 'hardenening' -> 'hardening'

> jvm variants), typically disabling speculative cti.
>                           To make hardening of hotspot a runtime choice,
>                           consider the "hardened" jvm variant instead 
> of this
>                           option. [disabled]
> Note that this changes the default for jdk libraries to not enable 
> hardening unless the user requests it.
> Webrev: http://cr.openjdk.java.net/~erikj/8202384/webrev.04/
> /Erik


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