This patch set introduces support for the RISC-V Smmpt (Supervisor Domain Access Protection) extension. It only includes two sub-extensions: SMSDID and SMMPT.
This patch set implements the v0.3.4 version of Smmpt (https://github.com/riscv/riscv-smmtt/releases/tag/v0.3.4). As there are newer SMMPT specification versions, this patch set is not intend for merging. The implementation is broken down into a series of logical steps: Patch 1 adds the fundamental definitions for the Smmpt extension, including new CSRs (mmpt, msdcfg), their bit-field layouts, and the corresponding CPU configuration flags (ext_smmpt, ext_smsdid). Patch 2 introduces the core logic for Memory Protection Table (MPT) lookups. It includes a new file, riscv_smmpt.c, which implements the multi-level table walk to determine permissions for a given physical address. Patch 3 integrates the MPT permission checks into the main MMU and TLB handling pathways. This ensures that both page table walks and final data accesses are subject to Smmpt protection rules. Patch 4 adds support for the new fence instructions defined by the Smmpt extension, specifically `mfence.spa` and `minval.spa`. Patch 5 enables smmpt and smsdia extendion. With this series, QEMU can now model systems that utilize the Smmpt extension for enhanced memory security. LIU Zhiwei (5): target/riscv: Add basic definitions and CSRs for SMMPT target/riscv: Implement core SMMPT lookup logic target/riscv: Integrate SMMPT checks into MMU and TLB fill target/riscv: Implement SMMPT fence instructions target/riscv: Enable SMMPT extension target/riscv/cpu.c | 4 + target/riscv/cpu.h | 9 +- target/riscv/cpu_bits.h | 27 ++ target/riscv/cpu_cfg_fields.h.inc | 2 + target/riscv/cpu_helper.c | 81 +++++- target/riscv/csr.c | 83 ++++++ target/riscv/insn32.decode | 2 + .../riscv/insn_trans/trans_privileged.c.inc | 30 ++ target/riscv/meson.build | 1 + target/riscv/pmp.h | 3 + target/riscv/riscv_smmpt.c | 273 ++++++++++++++++++ target/riscv/riscv_smmpt.h | 38 +++ 12 files changed, 548 insertions(+), 5 deletions(-) create mode 100644 target/riscv/riscv_smmpt.c create mode 100644 target/riscv/riscv_smmpt.h -- 2.25.1
