RFR: 8324304: RISC-V: add hw probe flags [v2]

[Fei Yang]

On Thu, 25 Jan 2024 19:12:16 GMT, Hamlin Li <mli at openjdk.org> wrote:

> I'm not sure, as these vm options (UseZic64b, UseZicbom, UseZicbop and UseZihintpause) are not `enable`d in RiscvHwprobe::add_features_from_query_result(), so I think they are not enabled automatically even if the hw supports these features, unless a vendor want to enable them.

Sorry, I missed that before. I think you are right.

> So, I think it's good to keep auto-enablement of Zicboz/Ztso/Zacas in vm_version_riscv.hpp, and remove the enable code of these options in RiscvHwprobe::add_features_from_query_result() in this patch?

Yeah, that will be more consistent.

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PR Comment: https://git.openjdk.org/jdk/pull/17519#issuecomment-1911757529