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Tue, 11 Nov 2025 16:51:21 -0800 (PST) From: Gabriel Brookman Date: Tue, 11 Nov 2025 19:50:53 -0500 Subject: [PATCH RFC 4/5] target/arm: add FEAT_MTE_STORE_ONLY logic MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251111-feat-mte4-v1-4-72ef5cf276f9@gmail.com> References: <20251111-feat-mte4-v1-0-72ef5cf276f9@gmail.com> In-Reply-To: <20251111-feat-mte4-v1-0-72ef5cf276f9@gmail.com> To: qemu-devel@nongnu.org Cc: Peter Maydell , Gustavo Romero , qemu-arm@nongnu.org, Gabriel Brookman X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1762908676; l=1406; i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id; bh=yvgh0EMVT0ltvLWA+q61dbTURKT5fEJL48Kbo0rzv/c=; b=Kdv1k+wkfEJeapVX/a2Nintjqzq2Mrx8gjbxU6/lwZPigtn5Tki8JOSTHHSblyJE+Js2qB2/d 01WgRerU9qCDZtFMgUUQOUCmG+dOCMGCcZctDyrpWKn9YZpS2bAt7M3 X-Developer-Key: i=brookmangabriel@gmail.com; a=ed25519; pk=m9TtPDal6WzoHNnQiHHKf8dTrv3DUCPUUTujuo8vNrw= 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::f34; envelope-from=brookmangabriel@gmail.com; helo=mail-qv1-xf34.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, FREEMAIL_FROM=0.001, 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 @gmail.com) X-ZM-MESSAGEID: 1762908773024153000 This feature automatically succeeds tag checks on load instructions when the appropriate SCTLR_TCSO register for the current exception level is set. Signed-off-by: Gabriel Brookman --- target/arm/tcg/mte_helper.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/target/arm/tcg/mte_helper.c b/target/arm/tcg/mte_helper.c index bb48fe359b..3f7e89f436 100644 --- a/target/arm/tcg/mte_helper.c +++ b/target/arm/tcg/mte_helper.c @@ -865,8 +865,30 @@ static int mte_probe_int(CPUARMState *env, uint32_t de= sc, uint64_t ptr, return 0; } =20 +static bool mte_store_only_active(CPUARMState *env) +{ + int el =3D arm_current_el(env); + if (el) { + if (SCTLR_TSCO & env->cp15.sctlr_el[el]) { + return true; + } + } else { + if ((HCR_E2H & env->cp15.hcr_el2) && + (SCTLR_TSCO0 & env->cp15.sctlr_el[2])) { + return true; + } else if (SCTLR_TSCO0 & env->cp15.sctlr_el[1]) { + return true; + } + } + return false; +} + uint64_t mte_check(CPUARMState *env, uint32_t desc, uint64_t ptr, uintptr_= t ra) { + if (!FIELD_EX32(desc, MTEDESC, WRITE) && mte_store_only_active(env)) { + return useronly_clean_ptr(ptr); + } + uint64_t fault; int ret =3D mte_probe_int(env, desc, ptr, ra, &fault); =20 --=20 2.51.2