From patchwork Thu Aug 1 12:06:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13750325 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 999AE1A3BAC; Thu, 1 Aug 2024 12:59:02 +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=1722517142; cv=none; b=lLe9zwWMtceJk9+RWVVGM5wVnt1e1NKAQcNYDoBbJm3ol2E4ESLXzW/9xWjhkThaVXKhhbB2iTa5q9znJ0kOtMy/m2XWkljq2KwG4c3AeR4gtGiCU/0UPi4bhy6efPh1QC252oc8ZieIzZPgFUtIVvVzyc9lqOVHgQ5NdattE8s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517142; c=relaxed/simple; bh=sqqkmEeL7tv5Wag3oPKgOfTAFLsGU8mgkKcr3MnXRIM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ogNeK2kcATN7jYIfap9kwDQxin9VXXVbw1LFcrrFbmOx6sjQ5cTD8mIKxytveUGoiF6d5o5a4Ka8RY9QCmC6BbmDdJObCXLPsp0ikFas+3alI6uSqUCGtE6wTf2phjLpkMd48GHJzfZ/lZoLjaIQlznezhbAmBXgoOzaV/AY6XA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lsWmVmR9; 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="lsWmVmR9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1867CC4AF10; Thu, 1 Aug 2024 12:58:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722517142; bh=sqqkmEeL7tv5Wag3oPKgOfTAFLsGU8mgkKcr3MnXRIM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=lsWmVmR9E2WgjWn+RgLL3PyZr6vGUhI7FHJzl1VUx+yXtAGp0+vgrsnRfEzxQPGF8 JEge+ccT2xkgSqTTKc43BQibLAN2Ff4RkJ4PJoSfiiHq36EdVEfRfqOICFTDHlyr8x GcgGDskfrMLd5JenB5QNSNHYQDdI7ih7Buhel8JcvWw7f6aINoluBytmA5D0QRg93r M4g7QjLRiu/6424aiBNTfRGzdx1eRsiBF6rKOsqNcy6Q0Pje228gBVVj5rtCSH76mR etppI/EaBZzCpoQY+V/GiPYFFQi1152aNx0npfmoX6t233KMZBi0w0WeQw939JZ31j Qp0K++dBcU8nA== From: Mark Brown Date: Thu, 01 Aug 2024 13:06:42 +0100 Subject: [PATCH v10 15/40] 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: <20240801-arm64-gcs-v10-15-699e2bd2190b@kernel.org> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> In-Reply-To: <20240801-arm64-gcs-v10-0-699e2bd2190b@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 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1899; i=broonie@kernel.org; h=from:subject:message-id; bh=sqqkmEeL7tv5Wag3oPKgOfTAFLsGU8mgkKcr3MnXRIM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmq4YRVVwOZRbiJRdOh866tHwB9fWzGXz1GHzjC2YM YZxFiIaJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZquGEQAKCRAk1otyXVSH0Ct1B/ 4i8fM2n38TeqWSOYLe9SGZf9V0EGaItvppKspC2O9Iz6LH2Ki3Uhm1aT8Y/219upgO0Pj+lApVwGQW NJoYZbJheeyUYExsZxy/tPp8NHS5vzITfA2Uauqqqc+Le+nX15+BzBtpIlqEe7FaW868OZNMz7+cUE NY5EGIt/Rkcvg5lO6Zh5mhBk+ERk9BTebzF7n2p4U6EdNmoBKBDo0Dc99B9jLdaalcDyZomv2B9i4f cUzrB3doruk6EOc7m8qoe84G8yflvsOjTcQ4weBKJmDitZfwE3twjnQBhTvlIrzzN2Ne4Xg4t040jI 8Txlbbf0NgH23Nmed0MqnbBcOo6gIH 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 Acked-by: Catalin Marinas --- 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 f1384c7b59c9..3006c1bd1af0 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 "