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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::a35; envelope-from=mchitale@ventanamicro.com; helo=mail-vk1-xa35.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ventanamicro.com) X-ZM-MESSAGEID: 1697698653531100003 Content-Type: text/plain; charset="utf-8" As per the Priv spec: "The R, W, and X fields form a collective WARL field for which the combinations with R=3D0 and W=3D1 are reserved." However currently such writes are not ignored as ought to be. The combinations with RW=3D01 are allowed only when the Smepmp extension is enabled and mseccfg.MML is set. Signed-off-by: Mayuresh Chitale Reviewed-by: Alistair Francis --- Changes in v3: =3D=3D=3D=3D - Rebase on latest riscv-to-apply.next - Add reviewed-by Changes in v2: =3D=3D=3D=3D - Default RW to 00 in case of an illegal value target/riscv/pmp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c index 4dfaa28fce2..162e88a90a6 100644 --- a/target/riscv/pmp.c +++ b/target/riscv/pmp.c @@ -123,6 +123,11 @@ static bool pmp_write_cfg(CPURISCVState *env, uint32_t= pmp_index, uint8_t val) if (locked) { qemu_log_mask(LOG_GUEST_ERROR, "ignoring pmpcfg write - locked= \n"); } else if (env->pmp_state.pmp[pmp_index].cfg_reg !=3D val) { + /* If !mseccfg.MML then ignore writes with encoding RW=3D01 */ + if ((val & PMP_WRITE) && !(val & PMP_READ) && + !MSECCFG_MML_ISSET(env)) { + val &=3D ~(PMP_WRITE | PMP_READ); + } env->pmp_state.pmp[pmp_index].cfg_reg =3D val; pmp_update_rule_addr(env, pmp_index); return true; --=20 2.34.1