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  1. JDK
  2. JDK-8309258

RISC-V: Add riscv_hwprobe syscall

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    • b03
    • riscv
    • linux

    Backports

      Description

        RISC-V has many extensions and it's not feasible to set them correctly on the command line for users.
        There is no instruction to get the cpu, such as cpuid on x86.

        Instead a syscall is being added:
        https://docs.kernel.org/riscv/hwprobe.html

        By adding this syscall and making use of it when available we can enable the correct extensions for the user.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8310953 RISC-V: Add riscv_hwprobe syscall

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8311348 RISC-V: Add riscv_hwprobe syscall

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8319890 RISC-V: Add riscv_hwprobe syscall

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            duplicates

            Enhancement - null JDK-8284196 RISC-V: Detect supported ISA extensions over cpuinfo

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8315206 RISC-V: hwprobe query is_set return wrong value

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8324280 RISC-V: Incorrect implementation in VM_Version::parse_satp_mode

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Task - A task that needs to be done. JDK-8316859 RISC-V: Disable detection of V through HWCAP

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            links to

            Commit Commit openjdk/jdk17u-dev/b5065594

            Commit Commit openjdk/jdk21/087d4a8c

            Commit Commit openjdk/jdk/31b6fd77

            Review Review openjdk/jdk17u-dev/1942

            Review Review openjdk/jdk21/67

            Review Review openjdk/jdk/14445

            Review Review openjdk/riscv-port-jdk11u/20

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                rehn Robbin Ehn
                rehn Robbin Ehn
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                  Created:
                  Updated:
                  Resolved: