From patchwork Mon Oct 9 12:08:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13413560 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 11FBBE95A91 for ; Mon, 9 Oct 2023 12:13:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+xKYM8Y89q4X9L1o4i/sv9gWz7Z8hIZ454Q6D8pXAZ4=; b=pluRc2UtpdStBd a2xUwSxaGUGJwhwj14DvASDGY58AKBN2ckcYUUz/vPnnMzdKvBGIeT+JxRUs/JtL+X4FTh9NK0Seo cRRm52UadFARtmOfFO9AVQIUO3PPXGRqxChA01ogBar8da6XwJtCDUenfiui8oRCYAlbcV+8PhE3l 2GFB1hQo/I2z1fVH/SjcZtRy7VQ1O6jb3Je3vl+qiv1jrWbhjgXQVRM0k8CTE9GPRj7JIIpNRa/o1 I9UtlE+SBQxYoLPsvRRnyTQZmkv8P8DCHY7dYuvOVfG6oS9I/FeY7+EvRPSDPLazL78aCc/XdT7Ws DnoIHJMPvJ9tajR//Tzw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qpp7m-00AawQ-2C; Mon, 09 Oct 2023 12:12:38 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qpp7i-00Aaqm-2D; Mon, 09 Oct 2023 12:12:36 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id 0B64FB81151; Mon, 9 Oct 2023 12:12:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 694ADC433CD; Mon, 9 Oct 2023 12:12:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696853552; bh=/vPx3SSl+mfIKMquypHtEKuBIXlpLAB4iLa0L5RlD3w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=sQev2RNtEnDEFPBmWkg1aPYHogLgGleP2M9edpa6zdfjrOm77CPrvQi8niVT3Q3XA PmofI6bdrOe3jo465oZ65rqQozZTbERNjr1JlgHm9YKvcfsq3nEWGOY27pZmgfjjyY dDSMy7U4xKkDc8C60A7VbrEkW/LnelkzXfGdxcDiA0l3rymIJ+ckAVoGbH5xXkvHEN 6zP+9swYon2IccqrGEKpcXv0rcTceZlfZ3HMAZiaAMgZ4Bk4wkuyPEIExSAnXIRc6s zhy1goGSBeOKhYpRqjCoLzuKbooaSsK4gY62IJDkYR2h8CzvSzLQp21Fv5NqJLcB65 0bMJuO/3HSw5A== From: Mark Brown Date: Mon, 09 Oct 2023 13:08:50 +0100 Subject: [PATCH v6 16/38] arm64/idreg: Add overrride for GCS MIME-Version: 1.0 Message-Id: <20231009-arm64-gcs-v6-16-78e55deaa4dd@kernel.org> References: <20231009-arm64-gcs-v6-0-78e55deaa4dd@kernel.org> In-Reply-To: <20231009-arm64-gcs-v6-0-78e55deaa4dd@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 , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , 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 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=1992; i=broonie@kernel.org; h=from:subject:message-id; bh=/vPx3SSl+mfIKMquypHtEKuBIXlpLAB4iLa0L5RlD3w=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlI+2drxB++QScfidUv9L+xi632YD4JcSnKHzTsqVd VSQXvKOJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZSPtnQAKCRAk1otyXVSH0A4PB/ 4ipjQMsBwdu2UD/vynqchKToRd0kqycl2G6DpsLfpWzFXRwRKSxafYc9AJV0lZ6KMxJHds43jisMvV JanLIXBScLRN2udzGEqwJxIOrJBqqd44dzshYankAdncw0JSQY6G4yAhGSytSv9bNgOzDeKTlAsmV6 6NkSgFh0Oi4iEOc2ROpLbOMk7/0IfTWjwEtrFMc+CFnQjvhR6BQ7Z/NuarIeE9cTd/KsjjJsHf/vvu yE89uLbLzKRtn5yyZsZKUQGm7gFXI37sKp5lcnx8lZe81PNtoBftCEicoN9GK9nWuDtwQgrd9k8tLi qhX2miMaBp7oy6sv9dTtWraYtOdYPx X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231009_051235_029563_5005C001 X-CRM114-Status: GOOD ( 10.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hook up an override for GCS, allowing it to be disabled from the command line by specifying arm64.nogcs in case there are problems. Signed-off-by: Mark Brown --- Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ arch/arm64/kernel/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 0a1731a0f0ef..7afea5f41ce0 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -418,9 +418,15 @@ 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/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 3addc09f8746..cc059ba39d58 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -99,6 +99,7 @@ static const struct ftr_set_desc pfr1 __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), {} @@ -178,6 +179,7 @@ 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 "