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Sun, 19 Oct 2025 21:21:09 -0700 (PDT) From: Xu Lu To: corbet@lwn.net, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com, mark.rutland@arm.com, anup@brainfault.org, atish.patra@linux.dev, pbonzini@redhat.com, shuah@kernel.org, parri.andrea@gmail.com, ajones@ventanamicro.com, brs@rivosinc.com, guoren@kernel.org Cc: linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org, apw@canonical.com, joe@perches.com, lukas.bulwahn@gmail.com, Xu Lu Subject: [PATCH v4 00/10] riscv: Add Zalasr ISA extension support Date: Mon, 20 Oct 2025 12:20:46 +0800 Message-ID: <20251020042056.30283-1-luxu.kernel@bytedance.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch adds support for the Zalasr ISA extension, which supplies the real load acquire/store release instructions. The specification can be found here: https://github.com/riscv/riscv-zalasr/blob/main/chapter2.adoc This patch seires has been tested with ltp on Qemu with Brensan's zalasr support patch[1]. Some false positive spacing error happens during patch checking. Thus I CCed maintainers of checkpatch.pl as well. [1] https://lore.kernel.org/all/CAGPSXwJEdtqW=nx71oufZp64nK6tK=0rytVEcz4F-gfvCOXk2w@mail.gmail.com/ v4: - Apply acquire/release semantics to arch_atomic operations. Thanks to Andrea. v3: - Apply acquire/release semantics to arch_xchg/arch_cmpxchg operations so as to ensure FENCE.TSO ordering between operations which precede the UNLOCK+LOCK sequence and operations which follow the sequence. Thanks to Andrea. - Support hwprobe of Zalasr. - Allow Zalasr extensions for Guest/VM. v2: - Adjust the order of Zalasr and Zalrsc in dt-bindings. Thanks to Conor. Xu Lu (10): riscv: Add ISA extension parsing for Zalasr dt-bindings: riscv: Add Zalasr ISA extension description riscv: hwprobe: Export Zalasr extension riscv: Introduce Zalasr instructions riscv: Apply Zalasr to smp_load_acquire/smp_store_release riscv: Apply acquire/release semantics to arch_xchg/arch_cmpxchg operations riscv: Apply acquire/release semantics to arch_atomic operations riscv: Remove arch specific __atomic_acquire/release_fence RISC-V: KVM: Allow Zalasr extensions for Guest/VM RISC-V: KVM: selftests: Add Zalasr extensions to get-reg-list test Documentation/arch/riscv/hwprobe.rst | 5 +- .../devicetree/bindings/riscv/extensions.yaml | 5 + arch/riscv/include/asm/atomic.h | 70 ++++++++- arch/riscv/include/asm/barrier.h | 91 +++++++++-- arch/riscv/include/asm/cmpxchg.h | 144 +++++++++--------- arch/riscv/include/asm/fence.h | 4 - arch/riscv/include/asm/hwcap.h | 1 + arch/riscv/include/asm/insn-def.h | 79 ++++++++++ arch/riscv/include/uapi/asm/hwprobe.h | 1 + arch/riscv/include/uapi/asm/kvm.h | 1 + arch/riscv/kernel/cpufeature.c | 1 + arch/riscv/kernel/sys_hwprobe.c | 1 + arch/riscv/kvm/vcpu_onereg.c | 2 + .../selftests/kvm/riscv/get-reg-list.c | 4 + 14 files changed, 314 insertions(+), 95 deletions(-) -- 2.20.1