Hi all,
This is v2 of a short series that adds kernel support for the ratified Zilsd (Load/Store pair) and Zclsd (Compressed Load/Store pair) RISC-V ISA extensions. The series enables kernel-side exposure so user-space (for example glibc) can detect and use these extensions via hwprobe and runtime checks.
Patches: - Patch 1：Add device tree bindings documentation for Zilsd and Zclsd. - Patch 2: Extend RISC-V ISA extension string parsing to recognize them. - Patch 3: Export Zilsd and Zclsd via riscv_hwprobe. - Patch 4: Allow KVM guests to use them. - Patch 5: Add KVM selftests.
Changes in v2: - Device-tree schema: simplified the rv64 validation for Zilsd by removing a redundant `contais: const: zilsd` in the `if` clause; the simpler `if (riscv, isa-base contains rv64i) then (riscv, isa-extension not contains zilsd)` form is used instead. Behaviour is unchanged, and the logic is cleaner. - Device-tree schema: corrected Zclsd dependency to require both Zilsd and Zca (previous `anyOf` was incorrect; now both are enforced). - Commit message typo fixed: "dt-bidings" -> "dt-bindings" in the Patch 1 commit subject.
The v2 changes are documentation/schema corrections in extensions.yaml. No functional changes were made to ISA parsing, hwprobe syscall, KVM guest support or the selftests beyond ensuring the binding correctly documents and validates the extension relationships.
Please review v2 and advise if futher changes are needed.
Thanks, Pincheng Wang
Pincheng Wang (5): dt-bindings: riscv: add Zilsd and Zclsd extension descriptions riscv: add ISA extension parsing for Zilsd and Zclsd riscv: hwprobe: export Zilsd and Zclsd ISA extensions riscv: KVM: allow Zilsd and Zclsd extensions for Guest/VM KVM: riscv: selftests: add Zilsd and Zclsd extension to get-reg-list test
Documentation/arch/riscv/hwprobe.rst | 8 +++++ .../devicetree/bindings/riscv/extensions.yaml | 36 +++++++++++++++++++ arch/riscv/include/asm/hwcap.h | 2 ++ arch/riscv/include/uapi/asm/hwprobe.h | 2 ++ arch/riscv/include/uapi/asm/kvm.h | 2 ++ arch/riscv/kernel/cpufeature.c | 24 +++++++++++++ arch/riscv/kernel/sys_hwprobe.c | 2 ++ arch/riscv/kvm/vcpu_onereg.c | 2 ++ .../selftests/kvm/riscv/get-reg-list.c | 6 ++++ 9 files changed, 84 insertions(+)