From patchwork Thu Aug 22 01:15:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 821527 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 501C5AD31; Thu, 22 Aug 2024 01:19:22 +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=1724289562; cv=none; b=Id2hXCKg6pWs4cWM6RJqncw4H7M2ZQMfrjPBQV7Dc+tAn6COfF+O4RU5RdaYBw68wQORF0KKqmZ71db4DhnyzGAMcs264nhd7f9CNrWUvZ/RzCDCyGRQMM7ZgPcm+4NGXxMuqkyO2Ta2RNZgVEQ+3w8RvhP+PS3fFDLE05k0Jts= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724289562; c=relaxed/simple; bh=sM6ARMSzs2g0dbHkgGbbEwKAjUQqEhC4Xbb3feAOKmM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sn+X8e6m8FJgQKzzLYfgFSCddVzeRWSn8FTmax1x3bw0JKn5aoiAXp/zUe8W2nMQ4oXEW7nSqk5J3NUclG6Pz0tPb/RaFB7cnL4mmiqN8qmALIlryyYLUOme/LWmNOlv9QePIJVf+rLfT1F546mJ7qe4gygV7QiA1kMCeytJQDw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ivuKgD4o; 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="ivuKgD4o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E48B0C32781; Thu, 22 Aug 2024 01:19:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724289561; bh=sM6ARMSzs2g0dbHkgGbbEwKAjUQqEhC4Xbb3feAOKmM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ivuKgD4on+C7+YhBbtby4IvVq0RxF5/bBnr2MIUKiL3RfsjHRaLfUWjrd/hoOkypi e5oVdrksEIE09GHZZ1grqgllXSGlEDPePmVsU7M80fXrCJvMLa+IOAqlM1+qRPyefT NDUMeFDAHPBoXvktlWhOxdzO2rdFQlY178qnfUC3rm4Z+F/Utr6VLItE1zn9NpiWjM tyFC+TuvGcYhcMAJweOwV0VqEtP1ItN5OzDAcmWealbnPLZYZTVCmu5TDgUX36j+xm hBL+YaIBVHz4YB32atTfhUVZDEps5Lz+5jhEsIfqxzoZtgyLuLZph2EmpqaRb2tecw P/DJmri42EczA== From: Mark Brown Date: Thu, 22 Aug 2024 02:15:19 +0100 Subject: [PATCH v11 16/39] 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: <20240822-arm64-gcs-v11-16-41b81947ecb5@kernel.org> References: <20240822-arm64-gcs-v11-0-41b81947ecb5@kernel.org> In-Reply-To: <20240822-arm64-gcs-v11-0-41b81947ecb5@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=1899; i=broonie@kernel.org; h=from:subject:message-id; bh=sM6ARMSzs2g0dbHkgGbbEwKAjUQqEhC4Xbb3feAOKmM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmxpEwGtjAb+Lbq6W5IxNjQfUxybDiSmB4j0xd4UwH +MPuN7mJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZsaRMAAKCRAk1otyXVSH0OdpCA CEOwzdvcro2Y/zsVAkDS1Gh8cqiwIlyIDREbBn+Y1Fsz928BKFuNCbEKy7zALRTxwtRrlYxNM9ZJl8 v6kBCKRDXGCRs98LRzPScxPU+FhtqEHbzd58yzE/ITWCObVM3dIfqSk1nd5rqSljitoRrI5Kx1XQYV reoDx/QxEVXfbj+YAbA297F3QOBTCghWQDCw4v4wkEH9Z7B/dOGjQVjJmxl9Wejbw9+9iT0x0PJDnN SwIXivwFaJ7YaXO7TSqvUYuVOOn7lmltxhmeimqnTp36IqnALj79krb8UmEeBQbeBn5DHxK5DgJzy6 WY4Wviz9IEqS1ZQnNP7EKG/eX+Mm1s 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 | 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 "