From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E91CEC4338F for ; Thu, 12 Aug 2021 19:05:45 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id A398F6108C for ; Thu, 12 Aug 2021 19:05:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A398F6108C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=jynyu4ddJz1JJxFJGEuWTPK0c0e+/X89A3ZkAShkSYs=; b=A98s8A/jEMpQ59 yPxJJzjDUPVDAalWo7wQJDUdDMAtItc44AbqQ3zjebeS5sBd+kgZY6P82Ezo/DNWw0BCXFc3Ri+iH 8VomZNvjVhxmTHbw8CWDHylq9BZRC+qD+8UaF/l42HdmWb6cRk7McsOlt7gNS3wz/XAgk5Ek4S3WH cw1gygR0pbk2S9+duKBF3DSywhm2PVzA8LA7ZTnKZInuWTn6l0yD6AghOCfQ6YtOFF3Rgm7/HTkIl 6NfcISbjvIUxqd8kORSQRAxm6Lhrt0V6dfGzXtS8kdhwnNfkBZnT3e0YXYE1mhr9/m/ao96+KVePc 7cQNjkBip3Q9RZjyL94Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mEFyx-00Axho-3I; Thu, 12 Aug 2021 19:03:11 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mEFyO-00AxZa-9K for linux-arm-kernel@lists.infradead.org; Thu, 12 Aug 2021 19:02:37 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1EAE76109D; Thu, 12 Aug 2021 19:02:35 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mEFyL-004c9r-FF; Thu, 12 Aug 2021 20:02:33 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= , Will Deacon , Catalin Marinas , Mark Rutland , Ard Biesheuvel , Florian Fainelli , bcm-kernel-feedback-list@broadcom.com, kernel-team@android.com Subject: [PATCH 5/5] arm64: Document the requirement for SCR_EL3.HCE Date: Thu, 12 Aug 2021 20:02:13 +0100 Message-Id: <20210812190213.2601506-6-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210812190213.2601506-1-maz@kernel.org> References: <20210812190213.2601506-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, zajec5@gmail.com, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, ardb@kernel.org, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210812_120236_405413_CAB0F731 X-CRM114-Status: GOOD ( 14.16 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org It is amazing that we never documented this absolutely basic requirement: if you boot the kernel at EL2, you'd better enable the HVC instruction from EL3. Really, just do it. Signed-off-by: Marc Zyngier --- Documentation/arm64/booting.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst index a9192e7a231b..6c729d0c4bc2 100644 --- a/Documentation/arm64/booting.rst +++ b/Documentation/arm64/booting.rst @@ -212,6 +212,11 @@ Before jumping into the kernel, the following conditions must be met: - The value of SCR_EL3.FIQ must be the same as the one present at boot time whenever the kernel is executing. + For all systems: + - If EL3 is present and the kernel is entered at EL2: + + - SCR_EL3.HCE (bit 8) must be initialised to 0b1. + For systems with a GICv3 interrupt controller to be used in v3 mode: - If EL3 is present: -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel