From patchwork Wed Aug 28 23:27:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13782139 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B38291ABECB; Wed, 28 Aug 2024 23:30:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887830; cv=none; b=uFksgH8Jw0ITsHiJMZnX7F9vXWBOEBJ13HWJuRCz3oRfc3sgD1hDpytjXpo84cikxVdWaeuz6tMr9RA8qBck9poH9HC6+muerNbn8DV6dYPpVN1Bee+979NS6AxKa78fi/dmqiHq9EYgntgg0fiByfFTiqe66YGNBh9SWOn2pIM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887830; c=relaxed/simple; bh=wjYe9ivwzmH2HU5Bu/krsN+hRENYTgl1ATQJfRBTR9I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=FKCuF75+DD8FlRi8LjQrMYoNqdUaMf4RF11mNIdp5LAhNv9mSSE1/AsN2qo72+ysz8V2six8QX0aE/YCJrb1MHckKwc7F+HcMamY6bEm9i3d+QCAc3O3KdAFwDdrAvIF3NeB/dodugHxi77y4lqM7HCk3rylYBE1lUjHkMaA1Ec= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lIbQQA5y; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lIbQQA5y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86F90C4CEC0; Wed, 28 Aug 2024 23:30:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724887830; bh=wjYe9ivwzmH2HU5Bu/krsN+hRENYTgl1ATQJfRBTR9I=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=lIbQQA5yebhqqE70nAuqgNR3tkh/f6rCrVtESiHZp3rzWZDkpq3TMxRtFLJisJc1C k6syrHZlg6DrCc8Kvoj9sUEy6VMLQxh3OceDdWlqMvMCkWUD7d982XWSa+OdUKB5ph fo+PchcSBoAEfB2IV7/rwPqOZNO0NGwQDZesbLUksruMraMqOYSnj+4h2qRlstYDiY JKAH2z9UL1KiSR/Cm+TDjnG2GJFsfLSQ0Lc8OzLdkf+5Gtb52gCQF+mMwJglnD0hoo ucodW81ooVhwrTweu90KLRFMCJaY2t/RWXgFbuFVDhg1GgbqC3wMbr5+fnT8TvTJQf TWBIiD9D8gnwQ== From: Mark Brown Date: Thu, 29 Aug 2024 00:27:32 +0100 Subject: [PATCH v12 16/39] arm64/idreg: Add overrride for GCS Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-arm64-gcs-v12-16-42fec947436a@kernel.org> References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> In-Reply-To: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=2008; i=broonie@kernel.org; h=from:subject:message-id; bh=wjYe9ivwzmH2HU5Bu/krsN+hRENYTgl1ATQJfRBTR9I=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmz7KFAReHbuS7RCcLtps3x4CwuXAzGuonS9h0Xm8V n2UpW62JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZs+yhQAKCRAk1otyXVSH0KO9B/ 9/OcoGpxSpHi/K8N7HKdwcDjo5X0BCdJlr1zjFK6/Mc0oZ7PGJDmIQFdUqBaGdjfltp6Rwmt4m7RZ+ 9F8TvVKqgOkl2sPrIUZ69dfurycmVlEC+1l6FOrv52pOxuegJf/x/bkpQMRN48IJN4OxdmB2AsxWpt 5S8vVLmYFF+kWZ7YBF7R1m4n5Ui67OpPO52vXgtVJfoZ+XvmKvVChxUzTWZSjHLOY46+WVKOGb74a1 BN1pGHzu4cCCWTuG76JTbxEiK3PS51OmZPqnaXiGZTJaJDfd9k+wa2I/7UGGyXb1S6wndNiTyZvHqq i4rZ0mp4l/YuxFW0rfR7UbAsU3IVzO X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Hook up an override for GCS, allowing it to be disabled from the command line by specifying arm64.nogcs in case there are problems. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas Acked-by: Catalin Marinas Signed-off-by: Mark Brown --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/kernel/pi/idreg-override.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 09126bb8cc9f..e6413bb8e6e1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -441,6 +441,9 @@ arm64.nobti [ARM64] Unconditionally disable Branch Target Identification support + arm64.nogcs [ARM64] Unconditionally disable Guarded Control Stack + support + arm64.nomops [ARM64] Unconditionally disable Memory Copy and Memory Set instructions support diff --git a/arch/arm64/kernel/pi/idreg-override.c b/arch/arm64/kernel/pi/idreg-override.c index 29d4b6244a6f..2bb709d78405 100644 --- a/arch/arm64/kernel/pi/idreg-override.c +++ b/arch/arm64/kernel/pi/idreg-override.c @@ -133,6 +133,7 @@ static const struct ftr_set_desc pfr1 __prel64_initconst = { .override = &id_aa64pfr1_override, .fields = { FIELD("bt", ID_AA64PFR1_EL1_BT_SHIFT, NULL ), + FIELD("gcs", ID_AA64PFR1_EL1_GCS_SHIFT, NULL), FIELD("mte", ID_AA64PFR1_EL1_MTE_SHIFT, NULL), FIELD("sme", ID_AA64PFR1_EL1_SME_SHIFT, pfr1_sme_filter), {} @@ -215,6 +216,7 @@ static const struct { { "arm64.nosve", "id_aa64pfr0.sve=0" }, { "arm64.nosme", "id_aa64pfr1.sme=0" }, { "arm64.nobti", "id_aa64pfr1.bt=0" }, + { "arm64.nogcs", "id_aa64pfr1.gcs=0" }, { "arm64.nopauth", "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 " "id_aa64isar1.api=0 id_aa64isar1.apa=0 "