From patchwork Tue Oct 1 22:58:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 832104 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 776D51CFEA1; Tue, 1 Oct 2024 23:03:01 +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=1727823781; cv=none; b=o/C2SQQKcE6DV/I3D/BIeKAmx9pSKR4G2NoeIF7gCzRHs2ivjv1OTqsi2LniEVI5hod00Am79zkZxfjY+ZY0wjjkGliO2HSnAfmNDioHBP9mpZt99pyRys8O3mBmEqqlXFSpaS2Y2W7QqMachEZ5qqv+1tKVHJ7G+Q4cYol7neg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823781; c=relaxed/simple; bh=zAbUzr1ODeYIke6nRWrxiS99ZR09MpEN2O+JxNln/KQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=n4ZIjwXz1wYr7mtXqj7zPQY8BlEd1g7BgPgwzgdD+Q/XB/YTGbxNMBm7ZOCUacmkUyGnQGAa6aDT5UPyvRefrW+LNVyt1+qBwYk2PHAOG0xQnJ4fULOEZqmx1emO35It5EvZzbR0MDOdFvTOjRtp7YfLca77WTEevpAoITLq9+4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nwsAukUu; 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="nwsAukUu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F414AC4CEC6; Tue, 1 Oct 2024 23:02:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727823781; bh=zAbUzr1ODeYIke6nRWrxiS99ZR09MpEN2O+JxNln/KQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=nwsAukUuBWfza0uW/rUXY3JuaOEaCfpGhqWfdkW4N1gDIkUidRK/hasGJbxinc8n9 aJuU34SmkjIp5dTX+VS2pz6KWmffzyTp6vcj+BHHUSPAxm4MvcCE0UpxaD7Y5fKPkn ZIouN8Bo132zSXBrDXzBs9KdMFWMGBAL+8NcAJOHtPBextX0bEy24+65ZtcHu2XBQh 4ExV9wc+5W+7nYeRkqGn3uWRbIMhfHZWT4rIQWmnRpTLfUw142l34HvjeorA2Ftp5z LQR24dMGjVHOKiE8geEw2Dk+GA2M8PK0kQgzok44ktT6EG3tYjPymmKJsyQtX5RU9K rq1mVjQibGiCQ== From: Mark Brown Date: Tue, 01 Oct 2024 23:58:56 +0100 Subject: [PATCH v13 17/40] 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: <20241001-arm64-gcs-v13-17-222b78d87eee@kernel.org> References: <20241001-arm64-gcs-v13-0-222b78d87eee@kernel.org> In-Reply-To: <20241001-arm64-gcs-v13-0-222b78d87eee@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 , David Spickett , 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-99b12 X-Developer-Signature: v=1; a=openpgp-sha256; l=2008; i=broonie@kernel.org; h=from:subject:message-id; bh=zAbUzr1ODeYIke6nRWrxiS99ZR09MpEN2O+JxNln/KQ=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBm/H7REUmBbOjHIbjRTXTBou6dlj2jf+JoQilSMLfb 4oamPWaJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZvx+0QAKCRAk1otyXVSH0FP1B/ 4sD5XnZ55qcZbmL8d240mUgjPiUILjDGICiY1VAzT57XN7KmS4yKXFIBxESjVgvnC8PpI/Y9Zb7sLt BoUFcV+Q7U8gNjyR9hza7jtoxvCKcCe9Fn68gwmkX0Q4K0iHv87BggWlo0hChy9JQMvrDNyrRwBnMY BQAtnYj8LUX9i5RQKhYnVKqYIz6KT6wIZL3OCytHzA4lDd0VcqnaXlWy8vM+ahKTXCJCH1oxk8LAzG 7YIm6HPFMIia0KQmWqlfB//G7jzb5amS/Mc8t2m3DcdvgO2PX0nljBPoA5AgKnG93CQFNxYmlBQ5kG 7zXw7oMDda+u457zCFPWYThTod14ro 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 1518343bbe22..c1b00f709734 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -446,6 +446,9 @@ 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 "