[PATCH v4 0/6] target/riscv: Implement Smsdid and Smmpt extension

[LIU Zhiwei <zhiwei_liu@linux.alibaba.com>]

This patch set introduces support for the RISC-V Smmpt (Supervisor
Memory-tracking and Protection Table) extension. Smmpt provides a
hardware mechanism for fine-grained memory protection, checked after
address translation, which is particularly useful for supervisor-level
sandboxing and security monitoring.

The rfc patch set:
https://mail.gnu.org/archive/html/qemu-riscv/2025-09/msg00216.html

v3->v4:
    1. Add missing review tags.
v2->v3:
    1. Fix build error in patch 2.
    2. Rebase to master.

rfc->v2:
    1. When ext_smmpt is false or BARE mode, make other fields in mmpt
       CSR zero.
    2. Add patch 5 to fix smrnmi ISA string order.
    3. Fix patch 6 smmpt and smsdid ISA string order.
    4. Make smmpt and smsdid experiment extensions.
    5. Add review tags.


LIU Zhiwei (6):
  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: Fix smrnmi isa alphabetical order
  target/riscv: Enable SMMPT extension

 target/riscv/cpu.c                            |   6 +-
 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                            |  95 ++++++
 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                    | 274 ++++++++++++++++++
 target/riscv/riscv_smmpt.h                    |  36 +++
 12 files changed, 560 insertions(+), 6 deletions(-)
 create mode 100644 target/riscv/riscv_smmpt.c
 create mode 100644 target/riscv/riscv_smmpt.h

-- 
2.25.1