[0/5] target/riscv: Smepmp fixes to match specification

Message

Loïc Lefort Feb. 25, 2025, 4 p.m. UTC

Hi,

These patches fix Smepmp implementation to make it compliant with the spec.

First patch limits RLB to CSR changes since RLB should not affect privilege
evaluation. Patch 2 extracts some common code into a function (to be used in
patch 3). Patch 3 fixes validation of pmpcfg CSR writes in order to match Smepmp
specification. Patch 4 is a small optimization and last patch is just removing
redundant code.

Loïc Lefort (5):
  target/riscv: pmp: don't allow RLB to bypass rule privileges
  target/riscv: pmp: move Smepmp operation conversion into a function
  target/riscv: pmp: fix checks on writes to pmpcfg in Smepmp MML mode
  target/riscv: pmp: exit csr writes early if value was not changed
  target/riscv: pmp: remove redundant check in pmp_is_locked

 target/riscv/pmp.c | 151 +++++++++++++++++++++++++--------------------
 1 file changed, 83 insertions(+), 68 deletions(-)