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Sun, 16 Nov 2025 17:40:45 -0800 (PST) Received: from [10.0.0.22] ([185.213.193.149]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4ee1c21ea34sm18246551cf.30.2025.11.16.17.40.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Nov 2025 17:40:44 -0800 (PST) From: Gabriel Brookman Date: Sun, 16 Nov 2025 20:40:21 -0500 Subject: [PATCH RFC v2 04/10] target/arm: add FEAT_MTE_STORE_ONLY logic MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251116-feat-mte4-v2-4-9a7122b7fa76@gmail.com> References: <20251116-feat-mte4-v2-0-9a7122b7fa76@gmail.com> In-Reply-To: <20251116-feat-mte4-v2-0-9a7122b7fa76@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=1763343639; l=1520; i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id; bh=68ZM+10B9YHoYASDZcGdBy4XhZSBVkzEJDAZb1ZURqE=; b=wC980mUNguhEfrIR5Nq6/5CttN9iRGDU71qsPwjgXzgFeylMIbfREmburYaJ/twikPUTvdsb6 ShAT0Y1fbGWCJNRkdc2aY45uYXLfHK1h5D7T3C5IycYmjf0IwtGBCQM X-Developer-Key: i=brookmangabriel@gmail.com; a=ed25519; pk=m9TtPDal6WzoHNnQiHHKf8dTrv3DUCPUUTujuo8vNrw= Received-SPF: pass client-ip=2607:f8b0:4864:20::82b; envelope-from=brookmangabriel@gmail.com; helo=mail-qt1-x82b.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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This feature automatically succeeds tag checks on load instructions when the appropriate SCTLR_TCSO register for the current exception level is set. Find information on this feature in the "Tag Checking" section of the ARM ARM, Memory Tagging Extension chapter. 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..f9fd6fd408 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 desc, uint64_t ptr, return 0; } +static bool mte_store_only_active(CPUARMState *env) +{ + int el = arm_current_el(env); + if (el) { + if (SCTLR_TCSO & env->cp15.sctlr_el[el]) { + return true; + } + } else { + if ((HCR_E2H & env->cp15.hcr_el2) && + (SCTLR_TCSO0 & env->cp15.sctlr_el[2])) { + return true; + } else if (SCTLR_TCSO0 & 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 = mte_probe_int(env, desc, ptr, ra, &fault); -- 2.51.2