From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45587CCFA18 for ; Wed, 12 Nov 2025 00:52:52 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vIz55-0004Q9-3F; Tue, 11 Nov 2025 19:51:27 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vIz52-0004OU-MQ for qemu-devel@nongnu.org; Tue, 11 Nov 2025 19:51:24 -0500 Received: from mail-qv1-xf34.google.com ([2607:f8b0:4864:20::f34]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1vIz50-0005ox-UX for qemu-devel@nongnu.org; Tue, 11 Nov 2025 19:51:24 -0500 Received: by mail-qv1-xf34.google.com with SMTP id 6a1803df08f44-88267973e5cso1732986d6.3 for ; Tue, 11 Nov 2025 16:51:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762908682; x=1763513482; darn=nongnu.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=CaohwLtIR7C9243DMpjNQ1vbzBgBz3c5xAC0e8E0Q+0=; b=CEgWIjNkVsVgpAojw07FM1Yh5cdq5ET05ul1GlNQT/lz6xHqsXvKCC/Va71iOz0N1B JkntsRunPQvKirMFNO0sRFNNE3xKeKPHj/NXE93zqe9nGJit2MiLogNuU3pJZ70SoQ+5 RkZmXO4BVDo23Vg92GGkovt+pdfRWU7nm8FJLuDIzsOIA4+iX9/ijkeIr81v6E+8G4t/ F2qpuSy7xIjpP/gs/w3JAXltsfBWoOZiHopGOJfb3zFis7UnhZTJxtH0HOvwXu3gXlB/ yZ15Dg20sQ0/VWguNxgY8NMcaAKYNCa7jmMvCpxziYNKwrfMtnj8p0/I6QuStMbrGlUj kB9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762908682; x=1763513482; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=CaohwLtIR7C9243DMpjNQ1vbzBgBz3c5xAC0e8E0Q+0=; b=tJTmouriwLGhkLCSuQZ/RE0OkY5COMUDjVXwlxJGS9XRSRDWHE3Nr8LWkQkg/TCCyy Ca2h0Jtl7vlejI+QnzGvLjvGqDPWGjINhNKglP2s4KimzHWFT4kn/pnGtn/LrFaFHyZF U4fednQ46FTh6L+XfsvXnADzLSCeKtd8p4TH6Svg8RBgxTJLbSDM82D2VP3gunYbAXtZ JaA5TV/PsnKs55Y9lf+kyyaUCFKSS+P82QY7/EOJZ0DGxXArbepcj1cI3phQY6w5o2tj JZLKSycU+naRmb1mM8wDhTfndRW9djNBjtXuf06ZekULMJNu8EUw4n7LeGgJpLMvbomt 38Gw== X-Gm-Message-State: AOJu0YyUEqWGJ2e7MqTBWyIjnIkQSG9i6ngHwOLF89+Z/GuoybeLJZZA wqrsAWcB33Xt39WvUFVxsXRbg7ufRfSBuT1ikA0gzwjjq54UcrUvUu09eiWPsVOi X-Gm-Gg: ASbGnctexMLfjZvWd52WLTeOb8Puc+SrbW8VPy5JDkmOeNZActq/dB7ZKWKrjhiarKe 86hR5Fi+iPclMj0uHQlBQ52pj0TLhf2WB49so6/0YDrYQ8CZ5mzPL02InFidylKM0N0yRR2+t9l zfPo0dMeX9HseFb1EmlwhEzfuEFehWY37gRPV3u+Zxb1JVDTuVdzLxRfLRld/hpkzDPZE9E5qdu s7oKbcwR+dvKG2fyA+v6gt/3pxCGyg/COHuf2b5bgvH+PJvUeio9/YqiOBEGoe+DWRCXTrjSqrT vCvEsxarPA8GcvOQO8vGMsFXoJfoUoLaNHnx6zy3uLkviESPbO/2TOJnXffCgtZ7UhY8xZvbp4J JJ0m0MxZss+YRf/tv0lIqLFIkadt9aVavj57ZYzZSb058ICrAPH/bBcaH5pcyx9IsL0+u9UWlZ0 MnA3tvPCc7 X-Google-Smtp-Source: AGHT+IF+iQ2O/bPV8bzxfq2n7/AJoDexY+2jxkQwYFmiEtInhWya4OGn7/fLuEKgyLuWPYTyEA8u7w== X-Received: by 2002:ad4:5aae:0:b0:882:49b3:c696 with SMTP id 6a1803df08f44-88271a1145emr19627776d6.50.1762908681800; Tue, 11 Nov 2025 16:51:21 -0800 (PST) Received: from [10.0.0.22] ([185.213.193.149]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8823892a79fsm81445096d6.4.2025.11.11.16.51.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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: 7bit 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 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+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. 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 desc, uint64_t ptr, return 0; } +static bool mte_store_only_active(CPUARMState *env) +{ + int el = 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 = mte_probe_int(env, desc, ptr, ra, &fault); -- 2.51.2