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([103.97.165.210]) by smtp.googlemail.com with ESMTPSA id n11-20020a170902d2cb00b001c06dcd453csm8527791plc.236.2023.09.25.04.10.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Sep 2023 04:10:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1695640234; x=1696245034; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=BvX2+sVn3mYCB1tN/Qo4MV8jbyR8oE8a/ORQJtmCsgc=; b=ZM8SPrZ/PmtYSeBF+n8ADEBDIoTSuaYSy6XzHMxxKivlFegsgw19LCZ0TSZF4FujtJ ejv2ZpKvCleR99+p35u1BE9u5XyAYNA7PtJxPvwzruX+nJYtWq511qJ3QdBXuUPdKDL5 7t84cvppuTppI0Dakav0OU71h9fBLO8H3V20Bhjro/qQ/CO8ZYILvqIF7sRrHWfJBt/C cLS9CZnpxzSd1nnkm95bzEmWCqi1OiMh34URQGkAyTjj04XJ2b6Mq3k31GiEsfY9ojkQ sKhOxJontvcoCFOYzG/r+sc4o3pvZ9IJJUuxfHMAXA/0ispuPmXBvbyWt6R+10NBSruZ XxGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695640234; x=1696245034; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=BvX2+sVn3mYCB1tN/Qo4MV8jbyR8oE8a/ORQJtmCsgc=; b=rm7sFZFWHgImvGtHj6hT8jCbEoPDd0chY9gArzS1I++6N10k/AYdsgfqxacUw2z2vB ls02psWw4BPBVVYezImcy38gcTc+bXevwG5TxOaYI9cAoN2WrAFglAf/EyuOEKV9RkwL dVVAP/pJGqL9wBRMmcMlh84ThoM61RPjuW6RRYizxSMntZdljRQoTirxzPU/uaBQ8Vh4 CzFrO5Vr7M6mQW9+4fFIfZU+TsTzNGii23lgtDAXpGWfsfp3jOiiwVVxlV2/3kO8faNp 0fnVFOze07C2NDh6R3ZTMThanMs3RMK5SzOR4XgoXKHK7lHqiB0wg13KyxhAeBvYfMSl IZlw== X-Gm-Message-State: AOJu0Yw6MnBlrdPFYIZ4kqra3kISaUz7RO/DuvJXAALaxWGBUIhBV8Vb AWh7iapZ8BW8WweBFQSD1cdLSQ== X-Google-Smtp-Source: AGHT+IHZL8Q7lLAUUnCqbzWnlc1zd8CEkgGl1WcMIWfpOuk/KZGaEFEIPuTXhKUKMHY0bK/vDQNXOQ== X-Received: by 2002:a17:902:ab1a:b0:1c5:cc30:7329 with SMTP id ik26-20020a170902ab1a00b001c5cc307329mr4466578plb.54.1695640234560; Mon, 25 Sep 2023 04:10:34 -0700 (PDT) From: Mayuresh Chitale To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org Cc: Mayuresh Chitale , Alistair Francis Subject: [PATCH v2] target/riscv: pmp: Ignore writes when RW=01 Date: Mon, 25 Sep 2023 16:40:25 +0530 Message-Id: <20230925111025.543094-1-mchitale@ventanamicro.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62c; envelope-from=mchitale@ventanamicro.com; helo=mail-pl1-x62c.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: 1695640259598100003 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 --- target/riscv/pmp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c index 5b14eb511a..8e25f145e0 100644 --- a/target/riscv/pmp.c +++ b/target/riscv/pmp.c @@ -120,6 +120,11 @@ static void 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 !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(env, pmp_index); } --=20 2.34.1