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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 D99CDC4332B for ; Fri, 20 Mar 2020 18:14:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF2ED20767 for ; Fri, 20 Mar 2020 18:14:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727061AbgCTSOj (ORCPT ); Fri, 20 Mar 2020 14:14:39 -0400 Received: from foss.arm.com ([217.140.110.172]:55296 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgCTSOj (ORCPT ); Fri, 20 Mar 2020 14:14:39 -0400 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 2C0DE1FB; Fri, 20 Mar 2020 11:14:39 -0700 (PDT) Received: from [10.37.12.158] (unknown [10.37.12.158]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4D3FF3F305; Fri, 20 Mar 2020 11:14:37 -0700 (PDT) Subject: Re: [PATCH 5/6] arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register To: anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will@kernel.org, james.morse@arm.com, maz@kernel.org, mark.rutland@arm.com, linux-kernel@vger.kernel.org References: <1580215149-21492-1-git-send-email-anshuman.khandual@arm.com> <1580215149-21492-6-git-send-email-anshuman.khandual@arm.com> From: Suzuki K Poulose Message-ID: Date: Fri, 20 Mar 2020 18:19:21 +0000 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: <1580215149-21492-6-git-send-email-anshuman.khandual@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/28/2020 12:39 PM, Anshuman Khandual wrote: > ID_DFR0 based TraceFilt feature should not be exposed. ... to guests. Hence lets drop it. Reviewed-by: Suzuki K Poulose > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: James Morse > Cc: Suzuki K Poulose > Cc: Marc Zyngier > Cc: Mark Rutland > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- > arch/arm64/kernel/cpufeature.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 2726bd6441da..a8ded1f0eeaf 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -374,7 +374,6 @@ static const struct arm64_ftr_bits ftr_id_pfr2[] = { > }; > > static const struct arm64_ftr_bits ftr_id_dfr0[] = { > - ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0), > S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf), /* PerfMon */ > ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0), > ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0), >