From patchwork Sun Jul 16 21:50:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13314970 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 EDC41C001B0 for ; Sun, 16 Jul 2023 21:54:04 +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=3rdexO6dYLu3XbDk4htVjSiQHD+7fnHwLaEGdVGhLzY=; b=Ks38UimQKKhcHG y5HpFozk6g/iLkLJwWugyjUJJz3g/Ygt6s+sPy6CRaT3sIWClxvSNwsyBXQ/pXOXiICwe27Qrloo2 KxK/v7coKPh1b1xOXkDdsFdQHxuhtlkhcsYLShVrRvLKlisIMY3lteCHqiVV+0ntnsJSROL0n3Px+ fn7YMCo6VSoTcdN28AuptCf2t2MBtWGDsqVu0BFZcaGliYlt09mqz79PWD3HRxvMd9UocE0iMcoz4 hW7yLe3toZfKnUIz1IQf7Lqc6NedfQe8L41ui489tSP1SR10ExGFgu/5ELGdbz0Jz9ikIM0TI2HMg jObYtBkGxNOHMFI4N7Dg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qL9gh-00FrwA-01; Sun, 16 Jul 2023 21:53:57 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qL9fx-00FrS7-2l; Sun, 16 Jul 2023 21:53:19 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 10A5160EC9; Sun, 16 Jul 2023 21:53:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4103C433C9; Sun, 16 Jul 2023 21:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689544388; bh=Z3injfV8td0LqFLeGew+/6AX1Y4kpAJIpTs5MPlZTRs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=N+Py4rEKJjLcKslfUQhgfO1OLzM2rGuwjpOszMNXo+y2NlpsFHeY3dbTRq/heqKTb wCotmXx42Mh4PFe5yqcrpQXV5HgTXSOOBEZ0RghiFHyfOaEpsg06fHhTe/tHw/6OcC BTi00ukC4eUl1XRMgUsAcmJBP7sjQxXyLeTfrrXdgYTCff4OLLtV6gVZjP8iCXVcKB P6nPf6DSHHfQz0nOcp8DDAG7JTMQcPwLVb6A5VLrHSwjq+I6/Q3R2TD5f/rPdDi8zy 3R8S3ECtvSSDliWtVW2gcieOb6yEb9YfvQqE8rjxrvgADtdRuLMv9zHcIhdhHgr48K TLshLQx2OIL8w== From: Mark Brown Date: Sun, 16 Jul 2023 22:50:59 +0100 Subject: [PATCH 03/35] arm64: Document boot requirements for Guarded Control Stacks MIME-Version: 1.0 Message-Id: <20230716-arm64-gcs-v1-3-bf567f93bba6@kernel.org> References: <20230716-arm64-gcs-v1-0-bf567f93bba6@kernel.org> In-Reply-To: <20230716-arm64-gcs-v1-0-bf567f93bba6@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 , 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-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1640; i=broonie@kernel.org; h=from:subject:message-id; bh=Z3injfV8td0LqFLeGew+/6AX1Y4kpAJIpTs5MPlZTRs=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBktGaRKKWoYO6shp83J7bdF2HDjv/deCuL6Bh7YBpr XGGHoyKJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZLRmkQAKCRAk1otyXVSH0DHnB/ 4m4xAjhCNKrOG833NrlQvIqQ8SUd4K5W5qh5Ps/ZgIVd+0dZkeIAFcRu2fAfuuHQl4Sg+SRkRdWPge eeiRzTVTFyv2RXMEQOPvtv1m5NUn4oCojVB4hywZSC/rE9XrRGNDjGZyEOO2ylprq2nf3mDYWjstJh 9jCBGUEEhqXr1LT17uFMA1zEsO7JJeQ33aTE6kDdjYlBrhTZq43pRfEROGeW7Dhgjx3sd6KCVltGCU WGPGxd+7M83m+GVw87chK92IZYO0+Fe1tKdfMfbfNslHg415niWo8ao4Tm76iYPut036lAZhbttboW zekDSpXoOfhPseiRPDqOQA1eWCZErE 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-20230716_145317_218636_91BFA8A3 X-CRM114-Status: GOOD ( 11.42 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org FEAT_GCS introduces a number of new system registers, we require that access to these registers is not trapped when we identify that the feature is detected. Signed-off-by: Mark Brown --- Documentation/arch/arm64/booting.rst | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/Documentation/arch/arm64/booting.rst b/Documentation/arch/arm64/booting.rst index b57776a68f15..de3679770c64 100644 --- a/Documentation/arch/arm64/booting.rst +++ b/Documentation/arch/arm64/booting.rst @@ -411,6 +411,28 @@ Before jumping into the kernel, the following conditions must be met: - HFGRWR_EL2.nPIRE0_EL1 (bit 57) must be initialised to 0b1. + - For features with Guarded Control Stacks (FEAT_GCS): + + - If EL3 is present: + + - SCR_EL3.GCSEn (bit 39) must be initialised to 0b1. + + - If the kernel is entered at EL1 and EL2 is present: + + - HFGITR_EL2.nGCSEPP (bit 59) must be initialised to 0b1. + + - HFGITR_EL2.nGCSSTR_EL1 (bit 58) must be initialised to 0b1. + + - HFGITR_EL2.nGCSPUSHM_EL1 (bit 57) must be initialised to 0b1. + + - HFGRTR_EL2.nGCS_EL1 (bit 53) must be initialised to 0b1. + + - HFGRTR_EL2.nGCS_EL0 (bit 52) must be initialised to 0b1. + + - HFGWTR_EL2.nGCS_EL1 (bit 53) must be initialised to 0b1. + + - HFGWTR_EL2.nGCS_EL0 (bit 52) must be initialised to 0b1. + The requirements described above for CPU mode, caches, MMUs, architected timers, coherency and system registers apply to all CPUs. All CPUs must enter the kernel in the same exception level. Where the values documented