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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D977C3DA5D for ; Thu, 25 Jul 2024 15:49:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9AD126B0088; Thu, 25 Jul 2024 11:49:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 95E616B0089; Thu, 25 Jul 2024 11:49:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 84BEA6B0092; Thu, 25 Jul 2024 11:49:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 6492E6B0088 for ; Thu, 25 Jul 2024 11:49:18 -0400 (EDT) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id DB9ABC1242 for ; 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imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of Dave.Martin@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=Dave.Martin@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1721922491; a=rsa-sha256; cv=none; b=6Z6XWf2Vbp8iW9j8Nd3ubHo7RfmDgfzAr91oOCpl7NyoY/GOcQhQ9h6nHbvl2NGwtJXjKs rq8c2nuYCUDJcnBTZVKVhJ8IimS00w/BOfPyeKYpkOJ0h/uLrENc0fq35eqvWcny0l6a94 zEPkEhSSTuyZB/kdtH3ZqrY7fTpiTDo= 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 990801596; Thu, 25 Jul 2024 08:49:40 -0700 (PDT) Received: from e133380.arm.com (e133380.arm.com [10.1.197.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 684063F766; Thu, 25 Jul 2024 08:49:11 -0700 (PDT) Date: Thu, 25 Jul 2024 16:49:08 +0100 From: Dave Martin To: Joey Gouly Cc: linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, szabolcs.nagy@arm.com, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev Subject: Re: [PATCH v4 10/29] arm64: enable the Permission Overlay Extension for EL0 Message-ID: References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-11-joey.gouly@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240503130147.1154804-11-joey.gouly@arm.com> X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 462101C001A X-Stat-Signature: 9fuiyrgo3ohuhymygpwnitk5tqdjk79r X-Rspam-User: X-HE-Tag: 1721922556-266240 X-HE-Meta: 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 +9JxXmAf XcjDwFLSTTShN65dsuVHYzo1xurDCuNAcK4QvtFuwRHOQmLbPS4Tu5hCNJi8JVAmtcmHE9xCeUEsDW9sas2P9IOn7eBMaWSbGwIM+WujHfoapf7j2+9BOsQBFE3Oow00WAxhD5LF/jApfVdr4YKqySbXvaSyr9+VToxcsHHJyXjlVTTAUaUAi2b2D8taX8Zq6oCCQMz/hCMqrswZGOGqD4DJw/ZabXQqjVfP7nyTwTgusXwDQ5qvnxVe/PMn8UKRmhtTq5lM7b8awB4o= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, May 03, 2024 at 02:01:28PM +0100, Joey Gouly wrote: > Expose a HWCAP and ID_AA64MMFR3_EL1_S1POE to userspace, so they can be used to > check if the CPU supports the feature. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > --- > > This takes the last bit of HWCAP2, is this fine? What can we do about more features in the future? > > > Documentation/arch/arm64/elf_hwcaps.rst | 2 ++ > arch/arm64/include/asm/hwcap.h | 1 + > arch/arm64/include/uapi/asm/hwcap.h | 1 + > arch/arm64/kernel/cpufeature.c | 14 ++++++++++++++ > arch/arm64/kernel/cpuinfo.c | 1 + > 5 files changed, 19 insertions(+) > > diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst > index 448c1664879b..694f67fa07d1 100644 > --- a/Documentation/arch/arm64/elf_hwcaps.rst > +++ b/Documentation/arch/arm64/elf_hwcaps.rst > @@ -365,6 +365,8 @@ HWCAP2_SME_SF8DP2 > HWCAP2_SME_SF8DP4 > Functionality implied by ID_AA64SMFR0_EL1.SF8DP4 == 0b1. > > +HWCAP2_POE > + Functionality implied by ID_AA64MMFR3_EL1.S1POE == 0b0001. Nit: unintentionally dropped blank line before the section heading? > > 4. Unused AT_HWCAP bits > ----------------------- [...] Cheers ---Dave