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  1. JDK
  2. JDK-8316859

RISC-V: Disable detection of V through HWCAP

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    • b17
    • riscv
    • linux

    Backports

      Description

        Some dev boards only support RVV version 0.7, while the OpenJDK only supports RVV version 1.0. These two versions are not compatible with each other. Given the V bit is set through HWCAP on some custom kernels, regardless of the version, it can lead to generating V instructions on boards that don't support RVV version 1.0 (ex: Sipeed LicheePi or VisionFive 2), leading to a SIGILL.

        That is an acceptable workaround as only Linux Kernel v6.5+ supports V, and that version already support hwprobe anyway

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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-8317488 RISC-V: Disable detection of V through HWCAP

            • 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-8319892 RISC-V: Disable detection of V through HWCAP

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

            Enhancement - null JDK-8309258 RISC-V: Add riscv_hwprobe syscall

            • 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/jdk21u/69af26c4

            Commit Commit openjdk/jdk/311c7461

            Review Review openjdk/jdk17u-dev/1942

            Review Review openjdk/jdk21u/203

            Review Review openjdk/jdk/15898

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                luhenry Ludovic Henry
                luhenry Ludovic Henry
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                  Created:
                  Updated:
                  Resolved: