From patchwork Tue Jun 25 14:57:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 807381 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 C979216FF52; Tue, 25 Jun 2024 15:02:26 +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=1719327746; cv=none; b=LBzWmf7glyBkgP/8Znz1EDN67TSUrkx61GL+CaUSsBZyS7VAOY0xaEVTlD0yh5VQYvSyoijowYdouYDdewfYzM61xsdEvp/tKLlNRwMx200CT2uiTLiahsgpsKx12lqYwamJL1jsctw9ovUv2nQC+GBCDXQsYXao66QN5mz6Qjo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719327746; c=relaxed/simple; bh=TArF8eu7bR+kdEQcw0PtiH938ElhCp6XbYhZJoxTCrM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kouCM8jMEV4cPKBzsia/pMN1/25XozqOEiI+5Y+DD9mxzt+9V1AjEPKr8J3QAryK2s9PIHBeNwTURrzcNfe1oD4uv/8S6wWAPawRJAhEMuqAqd+uOWA9+zDcwwDZ2zdfiTrENjYyXZOgtJiD+ni+ZY8WyCLXc8eYAVBqDSbjHdM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T1tf4EPZ; 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="T1tf4EPZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C4C9C32781; Tue, 25 Jun 2024 15:02:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327746; bh=TArF8eu7bR+kdEQcw0PtiH938ElhCp6XbYhZJoxTCrM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=T1tf4EPZxQepBQJZ+2P0ysocX15TlkKsctCglrLlJlpjTmopmLVcDgRZfo2fIdmZD Lv/NFHftNTdwBf3DqfZoSYfV6WuoyPIQEs2TNGXOriUMN11am9Hf5vq5ldwCQf9dmn 0E6qSnfvlSNhImxN7J/5Esjy55MKMRoTeQxGdu/7rc+s6RaBqycPQCbJ1TvVIWnutd b0q5gHzn3xZPm6Kw8+HEdwKQCSqhFutpjECRBpgQ1baiTggkrS2AIXDeYXF3KKOsEf YDaxMulmfJyDO7V7EcDfLhjZVhoJxdoOD6NAE0/79RPpuNfB41K0JcAzwYXIXZ95se U9cnQ8VrLX3Iw== From: Mark Brown Date: Tue, 25 Jun 2024 15:57:43 +0100 Subject: [PATCH v9 15/39] arm64/idreg: Add overrride for GCS Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240625-arm64-gcs-v9-15-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@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 , 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 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=2079; i=broonie@kernel.org; h=from:subject:message-id; bh=TArF8eu7bR+kdEQcw0PtiH938ElhCp6XbYhZJoxTCrM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmett9kBlIGznTOvZYNu30sR1HSi39oURagt2PuqvD Y/xML0+JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZnrbfQAKCRAk1otyXVSH0KppB/ 9h/NsU5ZbvEakpJLVgdEkxvY5UpqOW1ugkUmSI7i1GKJvwyAjnAS2GjipTcPYY971hQbCdfHwZcLlW cGE4g62zQz3KJInv2E7a5LvVkEoEx9xQoaz4HTnvgXRkvw7mt57wnleIJzA434vuYSF783mIrrb/33 UM4KkpS3btWvRrCRi2VY8VDuFhRhvl/BAYFalo/nvTDQt/Bivon71MD9KXQCaREWjPFWn45DqF5xqc fgB9TM3IcC9LyqQXwPr+ng36ckx4ht13tLxNrKJmclwsKt2v/DvuX9vgsKXW5FMhSnNTPvaVjaVXuC UWd9Pvf2d8i4vTpWJR3H1tCTBLdgiV 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 Signed-off-by: Mark Brown --- Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ arch/arm64/kernel/pi/idreg-override.c | 2 ++ 2 files changed, 8 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b600df82669d..c1151d547b81 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -437,9 +437,15 @@ 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 + arm64.nopauth [ARM64] Unconditionally disable Pointer Authentication + support + arm64.nomte [ARM64] Unconditionally disable Memory Tagging Extension 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 "