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=-10.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 426BAC433E0 for ; Sat, 23 Jan 2021 16:02:00 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 CD75422A84 for ; Sat, 23 Jan 2021 16:01:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD75422A84 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=gO1zfFQUIWA9CW/a+HBe+t1ePB+y5mMv8aDm03TKMgc=; b=d2EYmSh1SOYpt77ePCikhrFge m20YzUchVBl5EScw1R0vIj3M/F+OgiZ6cxN+yud39h6L0XtV3zrd3GscPluMf8dC1SIV9U+K9iNKr yW+cqRJ1UZN0E1K/U+WHrZbaKICsIq46NmVMyBmbeEXl3nnGkBBYg+uB12m18LSMAz2winYUOgEQh C0nrI9ZJ5XgKN07mCuUYRjTwRNCMNWcMe8j+ldPFMBfEd/Zji6pQQvP7maF0x8KPZMHyRNVLawAgM WAarXq1NnZErgsIACHQJwuMlk3gdcNFZ4/EFq7GVEkMIHu+m1tzmXQMqytEXo27a2nN9CLQ18FnQY 2YhlvcQvQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l3LKm-0002PH-FJ; Sat, 23 Jan 2021 16:00:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l3LKk-0002Ou-5c for linux-arm-kernel@lists.infradead.org; Sat, 23 Jan 2021 16:00:19 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 977DB11D4; Sat, 23 Jan 2021 08:00:12 -0800 (PST) Received: from [10.57.40.145] (unknown [10.57.40.145]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 605AD3F68F; Sat, 23 Jan 2021 08:00:07 -0800 (PST) Subject: Re: [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org References: <20210118094533.2874082-1-maz@kernel.org> <20210118094533.2874082-10-maz@kernel.org> From: Suzuki K Poulose Message-ID: Date: Sat, 23 Jan 2021 15:59:59 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210118094533.2874082-10-maz@kernel.org> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210123_110018_266120_758A1458 X-CRM114-Status: GOOD ( 12.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Jing Zhang , Prasad Sodagudi , Srinivas Ramana , kernel-team@android.com, Catalin Marinas , Alexandru Elisei , James Morse , Ajay Patil , David Brazdil , Will Deacon , Ard Biesheuvel , Julien Thierry Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/18/21 9:45 AM, Marc Zyngier wrote: > Add a facility to globally override a feature, no matter what > the HW says. Yes, this sounds dangerous, but we do respect the > "safe" value for a given feature. This doesn't mean the user > doesn't need to know what they are doing. > > Nothing uses this yet, so we are pretty safe. For now. > > Signed-off-by: Marc Zyngier Reviewed-by: Suzuki K Poulose _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel