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s=arc-20220608; d=hostedemail.com; t=1722529852; a=rsa-sha256; cv=none; b=CEuoCWN8Zm+PYz4X66CuZcTSyf4xbPZ9Oj0USBE12QLHytB9je2zj2D/ctZVRYLCRs+xr3 5G4Avrh4j7eU2+wcHeEUkdCpqKGMPNHEsJtTMVpRFRLkCU6R6eHLmt4HfeRl5CCLwai50g Phfv0dyOuGwBicUEqHGosJyssXI8DKA= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf04.hostedemail.com: domain of Dave.Martin@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=Dave.Martin@arm.com 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 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> <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-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6D85240018 X-Stat-Signature: aoni95tkg6zns6n653jq7bqbayhbob6u X-Rspam-User: X-HE-Tag: 1722529916-144866 X-HE-Meta: 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 vS0Av5bo Ss2KGXToTSe2eH6h2Lo2ADEit8NWF9I8MewMeZvhh0zXiNz1EZbd/ROlQxATFzZcm8pq71Y/8fNG6uxTlW8WrquXD1Z48Y6IzDtmoHkimto/RxnVUDbsn+4J/gk6210zIlGTliv9/ElZGtvMnuo5aWCei5juamd9bLCi2yHX1y2vGitFZNrHso+cmF4iH2tB0kaT0LtVtYyr4Xg94z59mpsCC7iVIszmy5ED/HtK7jvwbs5o46Ruk7sm9OBzIUsSjuZAhkt4Y0Mx3lpQ= 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 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