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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E948CC3DA64 for ; Thu, 1 Aug 2024 16:32:50 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WZZJK2lpVz3fSc for ; Fri, 2 Aug 2024 02:32:49 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arm.com (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=dave.martin@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4WZZHw0KTPz3dL8 for ; Fri, 2 Aug 2024 02:32:27 +1000 (AEST) 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 3D6FC1007; Thu, 1 Aug 2024 09:32:21 -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 97D4A3F5A1; Thu, 1 Aug 2024 09:31:52 -0700 (PDT) Date: Thu, 1 Aug 2024 17:31:50 +0100 From: Dave Martin To: Joey Gouly 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> <20240801160403.GD841837@e124191.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240801160403.GD841837@e124191.cambridge.arm.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: szabolcs.nagy@arm.com, catalin.marinas@arm.com, dave.hansen@linux.intel.com, linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, mingo@redhat.com, naveen.n.rao@linux.ibm.com, will@kernel.org, npiggin@gmail.com, broonie@kernel.org, bp@alien8.de, kvmarm@lists.linux.dev, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, oliver.upton@linux.dev, aneesh.kumar@linux.ibm.com, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Aug 01, 2024 at 05:04:03PM +0100, Joey Gouly wrote: > On Thu, Jul 25, 2024 at 04:49:08PM +0100, Dave Martin wrote: > > 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? > > Now there's only one blank line, I think > c1932cac7902a8b0f7355515917dedc5412eb15d unintentionally added 2 blank lines, > before that it was always 1! Hmmm, true. Not a big deal, I guess. Cheers ---Dave