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=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 742C6C2BB55 for ; Wed, 15 Apr 2020 11:32:51 +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 4413020737 for ; Wed, 15 Apr 2020 11:32:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="G/YxFc5I" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4413020737 Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOgHi-00054g-R0; Wed, 15 Apr 2020 11:32:50 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOgHg-00054B-9x for linux-arm-kernel@lists.infradead.org; Wed, 15 Apr 2020 11:32:49 +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 8470B1063; Wed, 15 Apr 2020 04:32:45 -0700 (PDT) Received: from [10.37.12.1] (unknown [10.37.12.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DCAB13F68F; Wed, 15 Apr 2020 04:32:42 -0700 (PDT) Subject: Re: [PATCH 7/8] arm64: cpufeature: Relax checks for AArch32 support at EL[0-2] To: will@kernel.org References: <20200414213114.2378-1-will@kernel.org> <20200414213114.2378-8-will@kernel.org> <714f124c-7eb7-b750-e98c-63da64ddae75@arm.com> <20200415105843.GE12621@willie-the-truck> From: Suzuki K Poulose Message-ID: Date: Wed, 15 Apr 2020 12:37:31 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20200415105843.GE12621@willie-the-truck> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200415_043248_387445_148CC695 X-CRM114-Status: GOOD ( 14.71 ) 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@arm.com, saiprakash.ranjan@codeaurora.org, anshuman.khandual@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org, dianders@chromium.org, catalin.marinas@arm.com, kernel-team@android.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 04/15/2020 11:58 AM, Will Deacon wrote: > On Wed, Apr 15, 2020 at 11:50:58AM +0100, Suzuki K Poulose wrote: >> On 04/14/2020 10:31 PM, Will Deacon wrote: >>> We don't need to be quite as strict about mismatched AArch32 support, >>> which is good because the friendly hardware folks have been busy >>> mismatching this to their hearts' content. >>> >>> * We don't care about EL2 or EL3 (there are silly comments concerning >>> the latter, so remove those) >>> >>> * EL1 support is gated by the ARM64_HAS_32BIT_EL1 capability and handled >>> gracefully when a mismatch occurs >>> >>> * EL1 support is gated by the ARM64_HAS_32BIT_EL0 capability and handled >> >> s/EL1/EL0 >> >>> gracefully when a mismatch occurs >>> >>> Relax the AArch32 checks to FTR_NONSTRICT. >> >> Agreed. We should do something similar for the features exposed by the >> ELF_HWCAP, of course in a separate series. > > Hmm, I didn't think we needed to touch the HWCAPs, as they're derived from > the sanitised feature register values. What am I missing? sorry, that was cryptic. I was suggesting to relax the ftr fields to NONSTRICT for the fields covered by ELF HWCAPs (and other CPU hwcaps). Suzuki _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel