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Mon, 05 Jan 2026 10:15:31 -0800 (PST) From: Gabriel Brookman Date: Mon, 05 Jan 2026 11:14:53 -0700 Subject: [PATCH RFC v3 04/12] linux-user: add MTE_STORE_ONLY to prctl MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260105-feat-mte4-v3-4-86a0d99ef2e4@gmail.com> References: <20260105-feat-mte4-v3-0-86a0d99ef2e4@gmail.com> In-Reply-To: <20260105-feat-mte4-v3-0-86a0d99ef2e4@gmail.com> To: qemu-devel@nongnu.org Cc: Peter Maydell , Gustavo Romero , Richard Henderson , qemu-arm@nongnu.org, Laurent Vivier , Gabriel Brookman X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1767636923; l=2508; i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id; bh=7iu0AGDmcowWfiZU7ESBith02k7QUQRf9isJWo39Au0=; b=vbCSYh9KWkv3PitmxrOhYznRIX9v4mkKzvCyvWXkCYtrno7dqUXMocBVOirwNyiocB2S9paCJ 0T/pVVcbeOECQ62/QYnTMhUY3tDSfHddMKKP5ytKf3Uhq4AFqESbNP8 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 (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::f30; envelope-from=brookmangabriel@gmail.com; helo=mail-qv1-xf30.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: 1767637028298158500 Linux-user processes can now control whether MTE_STORE_ONLY is enabled using the prctl syscall. Signed-off-by: Gabriel Brookman --- linux-user/aarch64/mte_user_helper.h | 3 +++ linux-user/aarch64/target_prctl.h | 11 +++++++++++ tests/tcg/aarch64/mte.h | 3 +++ 3 files changed, 17 insertions(+) diff --git a/linux-user/aarch64/mte_user_helper.h b/linux-user/aarch64/mte_= user_helper.h index 0c53abda22..afd2d6dbda 100644 --- a/linux-user/aarch64/mte_user_helper.h +++ b/linux-user/aarch64/mte_user_helper.h @@ -20,6 +20,9 @@ # define PR_MTE_TAG_SHIFT 3 # define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT) #endif +#ifndef PR_MTE_STORE_ONLY +# define PR_MTE_STORE_ONLY (1UL << 19) +#endif =20 /** * arm_set_mte_tcf0 - Set TCF0 field in SCTLR_EL1 register diff --git a/linux-user/aarch64/target_prctl.h b/linux-user/aarch64/target_= prctl.h index 621be5727f..5207580c1a 100644 --- a/linux-user/aarch64/target_prctl.h +++ b/linux-user/aarch64/target_prctl.h @@ -168,6 +168,9 @@ static abi_long do_prctl_set_tagged_addr_ctrl(CPUArchSt= ate *env, abi_long arg2) if (cpu_isar_feature(aa64_mte, cpu)) { valid_mask |=3D PR_MTE_TCF_MASK; valid_mask |=3D PR_MTE_TAG_MASK; + if (cpu_isar_feature(aa64_mte4, cpu)) { + valid_mask |=3D PR_MTE_STORE_ONLY; + } } =20 if (arg2 & ~valid_mask) { @@ -185,6 +188,14 @@ static abi_long do_prctl_set_tagged_addr_ctrl(CPUArchS= tate *env, abi_long arg2) */ env->cp15.gcr_el1 =3D deposit64(env->cp15.gcr_el1, 0, 16, ~arg2 >> PR_MTE_TAG_SHIFT); + + /* + * If MTE_STORE_ONLY is enabled, set the corresponding sctlr_el1 b= it + */ + if (cpu_isar_feature(aa64_mte4, cpu)) { + env->cp15.sctlr_el[1] =3D + deposit64(env->cp15.sctlr_el[1], 58, 1, extract64(arg2, 19= , 1)); + } arm_rebuild_hflags(env); } return 0; diff --git a/tests/tcg/aarch64/mte.h b/tests/tcg/aarch64/mte.h index 0805676b11..17b932f3f1 100644 --- a/tests/tcg/aarch64/mte.h +++ b/tests/tcg/aarch64/mte.h @@ -20,6 +20,9 @@ #ifndef PR_TAGGED_ADDR_ENABLE # define PR_TAGGED_ADDR_ENABLE (1UL << 0) #endif +#ifndef PR_MTE_STORE_ONLY +# define PR_MTE_STORE_ONLY (1UL << 19) +#endif #ifndef PR_MTE_TCF_SHIFT # define PR_MTE_TCF_SHIFT 1 # define PR_MTE_TCF_NONE (0UL << PR_MTE_TCF_SHIFT) --=20 2.52.0