RFR: 8345289: RISC-V: enable some extensions with hwprobe

[Hamlin Li]

On Mon, 2 Dec 2024 10:03:21 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> Hi,
>> Can you help to review the patch?
>> Currently, some extensions are not enable automatically with hwprobe, this is to enable them with hwprobe result.
>> 
>> Thanks!
>> 
>> Tests running so far so good.
>
> src/hotspot/os_cpu/linux_riscv/riscv_hwprobe.cpp line 184:
> 
>> 182:     VM_Version::ext_Zfh.enable_feature();
>> 183:   }
>> 184:   if (is_set(RISCV_HWPROBE_KEY_IMA_EXT_0, RISCV_HWPROBE_EXT_ZICBOZ)) {
> 
> Could you add Zicbop and Zicbom as well? Are they even supported/defined in the kernel headers?

Seems they are not supported in kernel yet, please check https://github.com/torvalds/linux/blob/master/arch/riscv/include/uapi/asm/hwprobe.h.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22474#discussion_r1865795175