From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 44A541BB6BC for ; Thu, 1 Aug 2024 16:04:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722528250; cv=none; b=DGaOj3myZ63XLlO5t/YPBlWZUKaq55yDvdmkkypyS9G5ynuTYN0n2v1ok7zOmL+6adMxr/L1LffaaoTn+VJ7rD4RD+3iCR6JTRxgNeB5jFH5H5KTQvNSPo/tFdB7HJSmzhlqAYNbl2mSWinflhQWMp8o7MTfMa4eZ84Gv0vUxgo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722528250; c=relaxed/simple; bh=NmJZ60xQs2NFwbsVmzDQrdllGEaCfgj+LwezPOl1sWk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GDX2bTcKQyEWED42WSgAXavyIoNTdBCLlEZeIlukZdmNfuDM07cdLJ6dSaDVOqqflXEYClM2Nzs9OivWaxlQVSV45ywiuLvbzPrKoIhqU+Aczw84GDQal1gfnxVOesgmN9zzk8RUJogK96L3T7tel/Ho9MlkBg9RenN/HX2dmlQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=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 682601007; Thu, 1 Aug 2024 09:04:34 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.1.197.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C48DD3F5A1; Thu, 1 Aug 2024 09:04:05 -0700 (PDT) Date: Thu, 1 Aug 2024 17:04:03 +0100 From: Joey Gouly To: Dave Martin 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: <20240801160403.GD841837@e124191.cambridge.arm.com> References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-11-joey.gouly@arm.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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! > > > > > 4. Unused AT_HWCAP bits > > ----------------------- > > [...] > > Cheers > ---Dave